backing up

.gitmodules

@@ -20,3 +20,12 @@
 [submodule "_ThirdParty/fmt"]
 	path = _ThirdParty/fmt
 	url = https://github.com/fmtlib/fmt.git
+[submodule "_ThirdParty/json"]
+	path = _ThirdParty/json
+	url = https://github.com/nlohmann/json.git
+[submodule "_ThirdParty/nfd"]
+	path = _ThirdParty/nfd
+	url = https://github.com/btzy/nativefiledialog-extended.git
+[submodule "_ThirdParty/uuid"]
+	path = _ThirdParty/uuid
+	url = https://github.com/mariusbancila/stduuid.git

CMakeLists.txt

@@ -12,35 +12,48 @@ set (GLFW_BUILD_TESTS OFF)
 set (GLFW_BUILD_DOCS OFF)
 add_subdirectory(_ThirdParty/glfw)
 
-add_subdirectory(_ThirdParty/spdlog)
-
-set (ASSIMP_INSTALL OFF)
-add_subdirectory(_ThirdParty/assimp)
-
 add_subdirectory(_ThirdParty/glm)
 
-add_subdirectory(_ThirdParty/entt)
+include_directories(src/imgui)
-
+file(GLOB_RECURSE IMGUI_SOURCES src/imgui/*.cpp)
-add_subdirectory(_ThirdParty/fmt)
-
-include_directories(_ThirdParty/imgui/lib)
-file(GLOB_RECURSE IMGUI_SOURCES _ThirdParty/imgui/lib/*.cpp)
 
 file(GLOB_RECURSE SOURCES ${CMAKE_SOURCE_DIR}/src/*.cpp)
 file(GLOB_RECURSE HEADERS ${CMAKE_SOURCE_DIR}/src/*.h)
 
+add_subdirectory(_ThirdParty/entt)
+add_subdirectory(_ThirdParty/fmt)
+add_subdirectory(_ThirdParty/spdlog)
+set(JSON_BuildTests OFF CACHE INTERNAL "")
+add_subdirectory(_ThirdParty/json)
+add_subdirectory(_ThirdParty/uuid)
+add_subdirectory(_ThirdParty/nfd)
+
+set (ASSIMP_INSTALL OFF)
+add_subdirectory(_ThirdParty/assimp)
+if(UNIX)
+    find_path(UNZIP_PATH unzip.h PATHS
+            /usr/include
+            /usr/local/include)
+
+    if(NOT UNZIP_PATH)
+        include_directories(/usr/include/minizip)
+    endif()
+
+    target_compile_options(assimp PRIVATE
+            -Wno-unused-but-set-variable
+    )
+endif()
+
 add_executable(${PROJECT_NAME}
         ${IMGUI_SOURCES}
         ${GLAD_SOURCE_DIR}/gl.c
         ${SOURCES}
-        ${HEADERS})
+        ${HEADERS}
+        src/ProjectManifestFile.cpp
+        src/ProjectManifestFile.h)
 
-add_custom_target(copy_resources
+target_link_libraries(${PROJECT_NAME} glfw spdlog assimp glm EnTT fmt nfd uuid)
-        COMMAND ${CMAKE_COMMAND} -E copy_directory
-        "${CMAKE_CURRENT_SOURCE_DIR}/resources"
-        "${CMAKE_CURRENT_BINARY_DIR}/resources"
-        COMMENT "Copying resources..."
-)
-
-target_link_libraries(${PROJECT_NAME} glfw spdlog assimp glm EnTT fmt)
 target_include_directories(${PROJECT_NAME} PRIVATE ${ASSIMP_INCLUDE_INSTALL_DIR})
+target_include_directories(${PROJECT_NAME} PRIVATE _ThirdParty/json/single_include)
+target_include_directories(${PROJECT_NAME} PRIVATE _ThirdParty/uuid/include)
+target_include_directories(${PROJECT_NAME} PRIVATE src)

README.md

@@ -1 +1,5 @@
-# b_engine
+# b_engine
+
+### if on linux and using wayland:
+```cd _ThirdParty/nfd```
+```git submodule update --init```

copy_imgui.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+IMGUI_SRC="./src/imgui"
+
+mkdir -p $IMGUI_SRC
+
+# copy the headers
+cp _ThirdParty/imgui/*.h $IMGUI_SRC
+cp _ThirdParty/imgui/backends/imgui_impl_glfw.h $IMGUI_SRC
+cp _ThirdParty/imgui/backends/imgui_impl_opengl3.h $IMGUI_SRC
+cp _ThirdParty/imgui/backends/imgui_impl_opengl3_loader.h $IMGUI_SRC
+
+# copy the source files
+cp _ThirdParty/imgui/*.cpp $IMGUI_SRC
+cp _ThirdParty/imgui/backends/imgui_impl_glfw.cpp $IMGUI_SRC
+cp _ThirdParty/imgui/backends/imgui_impl_opengl3.cpp $IMGUI_SRC

default_assets/shaders/phong.shader

@@ -0,0 +1,5 @@
+{
+    "name": "phong",
+    "vertex": "phong.vert",
+    "fragment": "phong.frag"
+}

resources/c4/C4Fixed.mtl

@@ -1,12 +0,0 @@
-# Blender 3.6.0 MTL File: 'None'
-# www.blender.org
-
-newmtl 01_-_Default.001
-Ns 10.000005
-Ka 1.000000 1.000000 1.000000
-Ks 0.000000 0.000000 0.000000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 1
-map_Kd Corvette_C4_Base_Color.png

resources/cube.obj

@@ -1,46 +0,0 @@
-# Blender v2.76 (sub 0) OBJ File: ''
-# www.blender.org
-mtllib cube.mtl
-o Cube
-v 1.000000 -1.000000 -1.000000
-v 1.000000 -1.000000 1.000000
-v -1.000000 -1.000000 1.000000
-v -1.000000 -1.000000 -1.000000
-v 1.000000 1.000000 -0.999999
-v 0.999999 1.000000 1.000001
-v -1.000000 1.000000 1.000000
-v -1.000000 1.000000 -1.000000
-vt 1.000000 0.333333
-vt 1.000000 0.666667
-vt 0.666667 0.666667
-vt 0.666667 0.333333
-vt 0.666667 0.000000
-vt 0.000000 0.333333
-vt 0.000000 0.000000
-vt 0.333333 0.000000
-vt 0.333333 1.000000
-vt 0.000000 1.000000
-vt 0.000000 0.666667
-vt 0.333333 0.333333
-vt 0.333333 0.666667
-vt 1.000000 0.000000
-vn 0.000000 -1.000000 0.000000
-vn 0.000000 1.000000 0.000000
-vn 1.000000 0.000000 0.000000
-vn -0.000000 0.000000 1.000000
-vn -1.000000 -0.000000 -0.000000
-vn 0.000000 0.000000 -1.000000
-usemtl Material
-s off
-f 2/1/1 3/2/1 4/3/1
-f 8/1/2 7/4/2 6/5/2
-f 5/6/3 6/7/3 2/8/3
-f 6/8/4 7/5/4 3/4/4
-f 3/9/5 7/10/5 8/11/5
-f 1/12/6 4/13/6 8/11/6
-f 1/4/1 2/1/1 4/3/1
-f 5/14/2 8/1/2 6/5/2
-f 1/12/3 5/6/3 2/8/3
-f 2/12/4 6/8/4 3/4/4
-f 4/13/5 3/9/5 8/11/5
-f 5/6/6 1/12/6 8/11/6

src/AssetRecord.h

@@ -0,0 +1,21 @@
+//
+// Created by slinky on 5/14/26.
+//
+
+#ifndef B_ENGINE_ASSETRECORD_H
+#define B_ENGINE_ASSETRECORD_H
+
+#include <string>
+#include "uuid.h"
+
+#include "Types.h"
+
+
+struct AssetRecord {
+    uuids::uuid uuid;
+    std::string sourcePath;
+    std::string cachePath;
+    AssetType assetType;
+};
+
+#endif //B_ENGINE_ASSETRECORD_H

src/AssetRegistry.cpp

@@ -0,0 +1,207 @@
+//
+// Created by slinky on 5/14/26.
+//
+
+#include "AssetRegistry.h"
+#include "AssetRecord.h"
+
+#include <filesystem>
+#include <fstream>
+#include <unordered_set>
+
+#include "MeshManager.h"
+#include "ModelImporter.h"
+#include "TextureManager.h"
+#include "uuid.h"
+#include "nlohmann/json.hpp"
+#include "spdlog/spdlog.h"
+
+using json = nlohmann::json;
+
+std::unordered_map<uuids::uuid, std::unique_ptr<AssetRecord>> AssetRegistry::_registry;
+
+const std::unordered_set<std::string> TextureExtensions = {
+    ".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp", ".tiff"
+};
+
+const std::unordered_set<std::string> ModelExtensions = {
+    ".obj", ".fbx", ".gltf", ".glb"
+};
+
+const std::unordered_set<std::string> ShaderExtensions = {
+    ".vert", ".frag", ".glsl"
+};
+
+AssetType check_asset_type(const Path& path) {
+    if (!path.has_extension()) {
+        return AssetType::UNKNOWN;
+    }
+
+    if (fs::is_directory(path)) {
+        return AssetType::DIRECTORY;
+    }
+
+    if (TextureExtensions.contains(path.extension().string())) {
+        return AssetType::TEXTURE;
+    }
+
+    if (ModelExtensions.contains(path.extension().string())) {
+        return AssetType::MODEL;
+    }
+
+    if (ShaderExtensions.contains(path.extension().string())) {
+        return AssetType::SHADER;
+    }
+
+    return AssetType::UNKNOWN;
+}
+
+uuids::uuid generate_uuid() {
+    thread_local auto gen = [] {
+        std::random_device rd;
+
+        auto seed_data =
+            std::array<int, std::mt19937::state_size>{};
+
+        std::generate(seed_data.begin(),
+                      seed_data.end(),
+                      std::ref(rd));
+
+        std::seed_seq seq(seed_data.begin(), seed_data.end());
+
+        std::mt19937 engine(seq);
+
+        return uuids::uuid_random_generator{engine};
+    }();
+
+    return gen();
+}
+
+void AssetRegistry::read_directory(const Path& path) {
+    fs::recursive_directory_iterator directory{path};
+    std::vector<fs::directory_entry> entries;
+
+    for (const auto& entry : directory) {
+        if (entry.exists()) {
+            entries.push_back(entry);
+        }
+    }
+
+    for (const auto& entry : entries) {
+        if (entry.path().extension() == ".meta") {
+            continue;
+        }
+
+        if (!generate_meta_file(entry.path())) {
+            spdlog::error("Failed to generate meta file for {}", entry.path().string());
+            continue;
+        }
+
+        std::optional<AssetRecord> record = read_meta_file(entry.path());
+        if (!record) {
+            continue;
+        }
+
+        _registry[record->uuid] = std::make_unique<AssetRecord>(*record);
+        AssetRecord* asset = _registry[record->uuid].get();
+
+        load_asset(asset);
+
+        if (entry.is_directory()) {
+            read_directory(entry.path());
+        }
+    }
+}
+
+bool AssetRegistry::does_meta_exist(const Path& path) {
+    Path meta = path;
+    meta += ".meta";
+    return fs::exists(meta);
+}
+
+std::optional<AssetRecord> AssetRegistry::read_meta_file(const Path &path) {
+    Path meta = path;
+    meta += ".meta";
+
+    if (!fs::exists(meta) && !generate_meta_file(path)) {
+        return std::optional<AssetRecord>{};
+    }
+
+    try {
+        AssetRecord record;
+        std::stringstream ss;
+        std::ifstream file {meta};
+        ss << file.rdbuf();
+        file.close();
+
+        std::string metaContent = ss.str();
+        json metaJson = json::parse(metaContent);
+
+        auto uuidString = metaJson["uuid"].get<std::string>();
+        std::optional<uuids::uuid> uuid = uuids::uuid::from_string(uuidString);
+        if (!uuid)
+        {
+            return std::optional<AssetRecord>{};
+        }
+
+        record.uuid = *uuid;
+        record.sourcePath = metaJson["sourcePath"].get<std::string>();
+        record.assetType = static_cast<AssetType>(metaJson["assetType"].get<int>());
+
+        return std::optional{record};
+    } catch (const std::exception& e) {
+        spdlog::error("Failed to read meta file: {}", e.what());
+        return std::optional<AssetRecord>{};
+    }
+}
+
+bool AssetRegistry::generate_meta_file(const Path& path) {
+    Path meta = path;
+    meta += ".meta";
+
+    if (fs::exists(meta)) return true;
+
+    try {
+        nlohmann::json j;
+        j["uuid"] = uuids::to_string(generate_uuid());
+        j["sourcePath"] = path.string();
+        j["assetType"] = check_asset_type(path);
+
+        std::ofstream file {meta};
+        std::stringstream ss;
+        ss << j.dump();
+        file << ss.str();
+        file.close();
+    } catch (const std::exception& e) {
+        spdlog::error("File exception while generating meta file: {}", e.what());
+        return false;
+    }
+
+    return true;
+}
+
+void AssetRegistry::load_asset(const AssetRecord* asset) {
+    switch (asset->assetType) {
+    case AssetType::SHADER:
+        return;
+    case AssetType::TEXTURE: {
+        ResourceHandle handle;
+        handle.assetUUID = asset->uuid;
+        TextureManager::textures[handle] = TextureManager::load_from_file(asset->sourcePath);
+        return;
+    }
+    case AssetType::MODEL: {
+        std::vector<Mesh> meshes = ModelImporter::load_from_file(asset->sourcePath);
+        for (int i = 0; i < meshes.size(); i++) {
+            ResourceHandle meshHandle;
+            meshHandle.assetUUID = asset->uuid;
+            meshHandle.localId = i + 1;
+            MeshManager::meshes[meshHandle] = std::make_unique<Mesh>(meshes[i]);
+        }
+        return;
+    }
+    case AssetType::DIRECTORY:
+    case AssetType::UNKNOWN:
+        break;
+    }
+}

src/AssetRegistry.h

@@ -0,0 +1,38 @@
+//
+// Created by slinky on 5/14/26.
+//
+
+#ifndef B_ENGINE_ASSETREGISTRY_H
+#define B_ENGINE_ASSETREGISTRY_H
+
+#include <unordered_map>
+#include <memory>
+#include <vector>
+#include <string_view>
+#include <filesystem>
+
+#include "AssetRecord.h"
+#include "uuid.h"
+
+namespace fs = std::filesystem;
+
+using Directory = fs::recursive_directory_iterator;
+using Path = fs::path;
+
+class AssetRegistry {
+public:
+    static void read_directory(const Path& path);
+
+    static std::vector<AssetRecord*> get_records();
+    static AssetRecord* get_record(uuids::uuid uuid);
+private:
+    static std::unordered_map<uuids::uuid, std::unique_ptr<AssetRecord>> _registry;
+
+    static bool does_meta_exist(const Path& path);
+    static std::optional<AssetRecord> read_meta_file(const Path& path);
+    static bool generate_meta_file(const Path& path);
+    static void load_asset(const AssetRecord* asset);
+};
+
+
+#endif //B_ENGINE_ASSETREGISTRY_H

src/Camera.cpp

@@ -0,0 +1,93 @@
+//
+// Created by slinky on 5/3/26.
+//
+
+#include "Camera.h"
+
+#include "glm/ext/matrix_transform.hpp"
+#include "glm/ext/matrix_clip_space.hpp"
+
+Camera::Camera(const glm::vec3 &pos, float pitch, float yaw, float aspectRatio) : _position(pos), _yaw(yaw), _pitch(pitch), _aspectRatio(aspectRatio) {
+    update_camera_vectors();
+    update_view();
+    update_projection();
+}
+
+const glm::mat4& Camera::view() const {
+    return _view;
+}
+
+const glm::mat4& Camera::projection() const {
+    return _projection;
+}
+
+const glm::vec3& Camera::position() const {
+    return _position;
+}
+
+glm::vec3 Camera::front() const {
+    return glm::normalize(_front);
+}
+
+glm::vec3 Camera::right() const {
+    return glm::normalize(_right);
+}
+
+glm::vec3 Camera::up() const {
+    return glm::normalize(_up);
+}
+
+float Camera::aspect_ratio() const {
+    return _aspectRatio;
+}
+
+void Camera::rotate_pitch(float offset) {
+    _pitch += offset;
+
+    if (_pitch < MIN_PITCH) {
+        _pitch = MIN_PITCH;
+    }
+
+    if (_pitch > MAX_PITCH) {
+        _pitch = MAX_PITCH;
+    }
+
+    update_camera_vectors();
+    update_view();
+}
+
+void Camera::rotate_yaw(float offset) {
+    _yaw += offset;
+    update_camera_vectors();
+    update_view();
+}
+
+void Camera::translate(const glm::vec3& translation) {
+    _position += translation;
+    update_view();
+}
+
+void Camera::update_aspect_ratio(float aspectRatio) {
+    _aspectRatio = aspectRatio;
+    _projection = glm::perspective(glm::radians(75.f), _aspectRatio, 0.1f, 100.0f);
+}
+
+void Camera::update_camera_vectors() {
+    _front = {};
+    _front.x = cos(glm::radians(_yaw)) * cos(glm::radians(_pitch));
+    _front.y = sin(glm::radians(_pitch));
+    _front.z = sin(glm::radians(_yaw)) * cos(glm::radians(_pitch));
+
+    _front = glm::normalize(_front);
+
+    _right = glm::normalize(glm::cross(_front, WORLD_UP));
+    _up = glm::normalize(glm::cross(_right, _front));
+}
+
+void Camera::update_projection() {
+    _projection = glm::perspective(glm::radians(75.f), _aspectRatio, 0.1f, 100.0f);
+}
+
+void Camera::update_view() {
+    _view = glm::lookAt(_position, _position + _front, _up);
+}

src/Camera.h

@@ -12,29 +12,24 @@ constexpr float MIN_PITCH = -89.f;
 
 constexpr glm::vec3 WORLD_UP = {0.0f, 1.0f, 0.0f};
 
-enum CAMERA_MOVEMENT {
+class Camera {
-    FORWARD,
-    BACKWARD,
-    LEFT,
-    RIGHT,
-    UP,
-    DOWN,
-};
-
-class FreeCamera {
 public:
-    FreeCamera() = default;
+    Camera() = default;
-    FreeCamera(const glm::vec3 &pos, float pitch, float yaw, float aspectRatio);
+    Camera(const glm::vec3 &pos, float pitch, float yaw, float aspectRatio);
 
     [[nodiscard]] const glm::mat4&  projection() const;
     [[nodiscard]] const glm::mat4&  view() const;
     [[nodiscard]] const glm::vec3&  position() const;
+    [[nodiscard]] glm::vec3  front() const;
+    [[nodiscard]] glm::vec3  up() const;
+    [[nodiscard]] glm::vec3  right() const;
+    [[nodiscard]] float aspect_ratio() const;
 
     void update_aspect_ratio(float aspectRatio);
     void rotate_yaw(float offset);
     void rotate_pitch(float offset);
 
-    void move(CAMERA_MOVEMENT direction, float offset);
+    void translate(const glm::vec3& direction);
 private:
     void update_camera_vectors();
     void update_projection();
@@ -42,9 +37,9 @@ private:
 
     glm::vec3 _position{};
 
-    glm::vec3 front{};
+    glm::vec3 _front{};
-    glm::vec3 up{};
+    glm::vec3 _up{};
-    glm::vec3 right{};
+    glm::vec3 _right{};
 
     glm::mat4 _view{};
     glm::mat4 _projection{};

src/Components.h

@@ -6,6 +6,7 @@
 #define B_ENGINE_COMPONENTS_H
 
 #include "Model.h"
+#include "ResourceHandle.h"
 
 #include "entt/entt.hpp"
 #include "glm/glm.hpp"
@@ -17,6 +18,7 @@ namespace Components {
         glm::vec3 rotation{};
         glm::vec3 scale{};
         glm::mat4 model = glm::identity<glm::mat4>();
+        bool dirty {true};
     };
 
     struct Relationship {
@@ -26,8 +28,8 @@ namespace Components {
         entt::entity next_sibling {entt::null};
     };
 
-    struct Drawable {
+    struct Mesh {
-        std::shared_ptr<Model> model {nullptr};
+        ResourceHandle handle;
     };
 
     struct DirectionalLight {
@@ -40,6 +42,10 @@ namespace Components {
     struct Tag {
         std::string name;
     };
+
+    struct Material {
+        ResourceHandle handle;
+    };
 }
 
 

src/DefaultResourceHandle.cpp

@@ -0,0 +1,9 @@
+//
+// Created by slinky on 5/18/26.
+//
+
+#include "DefaultResourceHandles.h"
+
+ResourceHandle DefaultResourceHandles::DEFAULT_DIFFUSE_TEXTURE = ResourceHandle { uuids::uuid::from_string("").value(), 0 };
+ResourceHandle DefaultResourceHandles::DEFAULT_SPECULAR_TEXTURE = ResourceHandle { uuids::uuid::from_string("").value(), 0 };
+ResourceHandle DefaultResourceHandles::DEFAULT_SHADER = ResourceHandle { uuids::uuid::from_string("").value(), 0 };

src/DefaultResourceHandles.h

@@ -0,0 +1,16 @@
+//
+// Created by slinky on 5/18/26.
+//
+
+#ifndef B_ENGINE_DEFAULTRESOURCEHANDLES_H
+#define B_ENGINE_DEFAULTRESOURCEHANDLES_H
+
+#include "ResourceHandle.h"
+
+struct DefaultResourceHandles {
+    static ResourceHandle DEFAULT_DIFFUSE_TEXTURE;
+    static ResourceHandle DEFAULT_SPECULAR_TEXTURE;
+    static ResourceHandle DEFAULT_SHADER;
+};
+
+#endif //B_ENGINE_DEFAULTRESOURCEHANDLES_H

src/EditorContext.h

@@ -0,0 +1,21 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_EDITORCONTEXT_H
+#define B_ENGINE_EDITORCONTEXT_H
+
+#include "Scene.h"
+#include "GLFW/glfw3.h"
+
+struct EditorContext {
+    bool sceneViewerFocused = false;
+    glm::vec2 viewportSize = glm::vec2 {};
+    float viewportAspectRatio = 1;
+
+    Scene* scene {nullptr};
+    GLFWwindow* window;
+    entt::entity selectedEntity;
+};
+
+#endif //B_ENGINE_EDITORCONTEXT_H

src/FreeCamera.cpp

@@ -1,99 +0,0 @@
-//
-// Created by slinky on 5/3/26.
-//
-
-#include "FreeCamera.h"
-
-#include "glm/ext/matrix_transform.hpp"
-#include "glm/ext/matrix_clip_space.hpp"
-
-FreeCamera::FreeCamera(const glm::vec3 &pos, float pitch, float yaw, float aspectRatio) : _position(pos), _yaw(yaw), _pitch(pitch), _aspectRatio(aspectRatio) {
-    update_camera_vectors();
-    update_view();
-    update_projection();
-}
-
-const glm::mat4& FreeCamera::view() const {
-    return _view;
-}
-
-const glm::mat4& FreeCamera::projection() const {
-    return _projection;
-}
-
-const glm::vec3& FreeCamera::position() const {
-    return _position;
-}
-
-void FreeCamera::rotate_pitch(float offset) {
-    _pitch += offset;
-
-    if (_pitch < MIN_PITCH) {
-        _pitch = MIN_PITCH;
-    }
-
-    if (_pitch > MAX_PITCH) {
-        _pitch = MAX_PITCH;
-    }
-
-    update_camera_vectors();
-    update_view();
-}
-
-void FreeCamera::rotate_yaw(float offset) {
-    _yaw += offset;
-    update_camera_vectors();
-    update_view();
-}
-
-void FreeCamera::move(CAMERA_MOVEMENT direction, float offset) {
-    glm::vec3 finalDirection = {};
-
-    switch (direction) {
-    case FORWARD:
-        finalDirection = front;
-        break;
-    case BACKWARD:
-        finalDirection = -front;
-        break;
-    case LEFT:
-        finalDirection = -right;
-        break;
-    case RIGHT:
-        finalDirection = right;
-        break;
-    case UP:
-        finalDirection = up;
-        break;
-    case DOWN:
-        finalDirection = -up;
-        break;
-    }
-
-    finalDirection = glm::normalize(finalDirection);
-    _position += finalDirection * offset;
-    _view = glm::lookAt(_position, _position + front, up);
-}
-
-void FreeCamera::update_aspect_ratio(float aspectRatio) {
-    _aspectRatio = aspectRatio;
-    _projection = glm::perspective(glm::radians(75.f), _aspectRatio, 0.1f, 100.0f);
-}
-
-void FreeCamera::update_camera_vectors() {
-    front = {};
-    front.x = cos(glm::radians(_yaw)) * cos(glm::radians(_pitch));
-    front.y = sin(glm::radians(_pitch));
-    front.z = sin(glm::radians(_yaw)) * cos(glm::radians(_pitch));
-
-    right = glm::normalize(glm::cross(front, WORLD_UP));
-    up = glm::normalize(glm::cross(right, front));
-}
-
-void FreeCamera::update_projection() {
-    _projection = glm::perspective(glm::radians(75.f), _aspectRatio, 0.1f, 100.0f);
-}
-
-void FreeCamera::update_view() {
-    _view = glm::lookAt(_position, _position + front, up);
-}

src/FreeCameraController.cpp

@@ -0,0 +1,57 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#include "FreeCameraController.h"
+#include "InputManager.h"
+
+void FreeCameraController::update(EditorContext &ctx) {
+    checkInput = ctx.sceneViewerFocused;
+
+    if (!checkInput) return;
+
+    if (InputManager::check_action_performed("move_forward")) {
+        const glm::vec3 translation = camera->front() * movement_speed;
+        camera->translate(translation);
+    }
+
+    if (InputManager::check_action_performed("move_backward")) {
+        const glm::vec3 translation = camera->front() * -movement_speed;
+        camera->translate(translation);
+    }
+
+    if (InputManager::check_action_performed("move_left")) {
+        const glm::vec3 translation = camera->right() * -movement_speed;
+        camera->translate(translation);
+    }
+
+    if (InputManager::check_action_performed("move_right")) {
+        const glm::vec3 translation = camera->right() * movement_speed;
+        camera->translate(translation);
+    }
+
+    if (InputManager::check_action_performed("move_up")) {
+        const glm::vec3 translation = camera->up() * movement_speed;
+        camera->translate(translation);
+    }
+
+    if (InputManager::check_action_performed("move_down")) {
+        const glm::vec3 translation = camera->up() * -movement_speed;
+        camera->translate(translation);
+    }
+}
+
+void FreeCameraController::on_mouse_delta(float xoff, float yoff) const {
+    if (!checkInput) return;
+
+    camera->rotate_pitch(yoff * look_sensitivity);
+    camera->rotate_yaw(xoff * look_sensitivity);
+}
+
+void FreeCameraController::set_camera(Camera& c) {
+    camera = &c;
+}
+
+void FreeCameraController::release_camera() {
+    camera = nullptr;
+}

src/FreeCameraController.h

@@ -0,0 +1,30 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_FREECAMERACONTROLLER_H
+#define B_ENGINE_FREECAMERACONTROLLER_H
+
+#include "Camera.h"
+#include "EditorContext.h"
+
+class FreeCameraController {
+public:
+    FreeCameraController() = default;
+
+    void update(EditorContext& ctx);
+    void on_mouse_delta(float xoff, float yoff) const;
+
+    void set_camera(Camera& c);
+    void release_camera();
+
+    float movement_speed = .01;
+    float look_sensitivity = .01;
+private:
+    Camera* camera {nullptr};
+
+    bool checkInput = false;
+};
+
+
+#endif //B_ENGINE_FREECAMERACONTROLLER_H

src/Material.h

@@ -5,30 +5,24 @@
 #ifndef B_ENGINE_MATERIAL_H
 #define B_ENGINE_MATERIAL_H
 
-#include <memory>
-
 #include <glm/glm.hpp>
 
-#include "Texture.h"
+#include "ResourceHandle.h"
 
-typedef struct
+struct PhongProperties {
-{
     glm::vec3 ambient;
     glm::vec3 diffuse;
     glm::vec3 specular;
     float shininess;
-} PhongProperties;
+};
 
-typedef struct
+struct Material{
-{
+    ResourceHandle diffuse;
-    std::shared_ptr<Texture> diffuse;
+    ResourceHandle specular;
-    std::shared_ptr<Texture> specular;
+    ResourceHandle normal;
-    std::shared_ptr<Texture> normal;
+    PhongProperties phong{};
-
+    ResourceHandle shader;
-    std::string name;
+};
-
-    PhongProperties phong;
-} Material;
 
 
 #endif //B_ENGINE_MATERIAL_H

src/MaterialFile.cpp

@@ -0,0 +1,93 @@
+//
+// Created by slinky on 5/18/26.
+//
+
+#include "MaterialFile.h"
+
+#include <fstream>
+
+#include "DefaultResourceHandles.h"
+#include "spdlog/spdlog.h"
+#include "nlohmann/json.hpp"
+
+using json = nlohmann::json;
+
+std::optional<ResourceHandle> read_resource_handle(const json& j) {
+    ResourceHandle handle;
+
+    if (j.is_null()) {
+        return std::optional<ResourceHandle>();
+    }
+
+    if (!j.contains("assetUUID")) {
+        return std::optional<ResourceHandle>();
+    }
+
+    auto uuidStr = j["assetUUID"].get<std::string>();
+    auto uuid = uuids::uuid::from_string(uuidStr);
+    if (!uuid.has_value()) {
+        return std::optional<ResourceHandle>();
+    }
+    handle.assetUUID = *uuid;
+
+    if (!j.contains("localId")) {
+        return std::optional<ResourceHandle>();
+    }
+    handle.localId = j["localId"].get<uint32_t>();
+
+    return handle;
+}
+
+std::optional<Material> MaterialFile::load(std::string_view _path) {
+    std::ifstream file;
+    file.open(_path.data(), std::ios::in);
+    if (!file.is_open()) {
+        spdlog::error("failed to open project file {}", _path);
+        return std::optional<Material>();
+    }
+
+    std::stringstream ss;
+    ss << file.rdbuf();
+
+    std::string fileData = ss.str();
+
+    try {
+        auto data = json::parse(fileData);
+
+
+        Material material;
+
+        // ---------------------------------
+        // Texture/resource handles
+        // ---------------------------------
+
+        material.diffuse = DefaultResourceHandles::DEFAULT_DIFFUSE_TEXTURE;
+        if (auto diffuse = read_resource_handle(data["diffuse"]); diffuse.has_value()) {
+            material.diffuse = *diffuse;
+        }
+
+        material.normal = DefaultResourceHandles::DEFAULT_DIFFUSE_TEXTURE;
+        if (auto normal = read_resource_handle(data["normal"]); normal.has_value()) {
+            material.normal = *normal;
+        }
+
+        material.specular = DefaultResourceHandles::DEFAULT_SPECULAR_TEXTURE;
+        if (auto specular = read_resource_handle(data["specular"]); specular.has_value()) {
+            material.specular = *specular;
+        }
+
+        material.shader = DefaultResourceHandles::DEFAULT_SHADER;
+        if (auto shader = read_resource_handle(data["shader"]); shader.has_value()) {
+            material.shader = *shader;
+        }
+
+        return material;
+    } catch (const std::exception& e) {
+        spdlog::error("Error reading material file: {}", e.what());
+        return std::optional<Material>();
+    }
+}
+
+bool MaterialFile::save(std::string_view _path, Material *_project) {
+    return true;
+}

src/MaterialFile.h

@@ -0,0 +1,17 @@
+//
+// Created by slinky on 5/18/26.
+//
+
+#ifndef B_ENGINE_MATERIALFILE_H
+#define B_ENGINE_MATERIALFILE_H
+
+#include "Material.h"
+
+class MaterialFile {
+public:
+    static std::optional<Material> load(std::string_view _path);
+    static bool save(std::string_view _path, Material* _project);
+};
+
+
+#endif //B_ENGINE_MATERIALFILE_H

src/MaterialManager.cpp

@@ -0,0 +1,7 @@
+//
+// Created by slinky on 5/17/26.
+//
+
+#include "MaterialManager.h"
+
+std::unordered_map<ResourceHandle, std::unique_ptr<Material>> MaterialManager::materials = {};

src/MaterialManager.h

@@ -0,0 +1,17 @@
+//
+// Created by slinky on 5/17/26.
+//
+
+#ifndef B_ENGINE_MATERIALMANAGER_H
+#define B_ENGINE_MATERIALMANAGER_Hs
+#include <unordered_map>
+
+#include "Material.h"
+#include "ResourceHandle.h"
+
+class MaterialManager {
+public:
+    static std::unordered_map<ResourceHandle, std::unique_ptr<Material>> materials;
+};
+
+#endif //B_ENGINE_MATERIALMANAGER_H

src/Mesh.h

@@ -21,7 +21,6 @@ public:
     GLuint vao = 0;
     GLuint ebo = 0;
     unsigned int numIndices = 0;
-    unsigned int materialId = 0;
 };
 
 #endif //B_ENGINE_MESH_H

src/MeshManager.cpp

@@ -0,0 +1,7 @@
+//
+// Created by slinky on 5/17/26.
+//
+
+#include "MeshManager.h"
+
+std::unordered_map<ResourceHandle, std::unique_ptr<Mesh>> MeshManager::meshes;

src/MeshManager.h

@@ -0,0 +1,18 @@
+//
+// Created by slinky on 5/17/26.
+//
+
+#ifndef B_ENGINE_MESHMANAGER_H
+#define B_ENGINE_MESHMANAGER_H
+
+#include <unordered_map>
+
+#include "ResourceHandle.h"
+#include "Mesh.h"
+
+class MeshManager {
+public:
+    static std::unordered_map<ResourceHandle, std::unique_ptr<Mesh>> meshes;
+};
+
+#endif //B_ENGINE_MESHMANAGER_H

src/ModelImporter.cpp

@@ -4,7 +4,7 @@
 
 #include <spdlog/spdlog.h>
 
-#include "ModelManager.h"
+#include "ModelImporter.h"
 
 #include <assimp/Importer.hpp>
 #include <assimp/postprocess.h>
@@ -15,15 +15,12 @@
 #include "TextureManager.h"
 #include "glm/ext/matrix_transform.hpp"
 
-std::unordered_map<std::string, std::shared_ptr<Model>> ModelManager::models;
-
 void process_ai_node(aiNode* node, const aiScene* scene, glm::mat4 transform, ModelNode& model);
-
 void process_ai_mesh(const aiMesh* aiMesh, Mesh& mesh);
 
-void process_ai_material(const aiMaterial* aiMat, Material& mat, const std::filesystem::path& modelDirectory);
+/*void process_ai_material(const aiMaterial* aiMat, Material& mat, const std::filesystem::path& modelDirectory);
 void process_ai_material_diffuse(const aiMaterial *aiMat, Material& mat, const std::filesystem::path& modelDirectory);
-void process_ai_material_specular(const aiMaterial *aiMat, Material& mat, const std::filesystem::path& modelDirectory);
+void process_ai_material_specular(const aiMaterial *aiMat, Material& mat, const std::filesystem::path& modelDirectory);*/
 
 auto zUpMatrix = glm::mat4(
     1.0f,  0.0f,  0.0f,  0.0f,  // Column 0
@@ -32,7 +29,7 @@ auto zUpMatrix = glm::mat4(
     0.0f,  0.0f,  0.0f,  1.0f   // Column 3
 );
 
-std::shared_ptr<Model> ModelManager::load_from_file(std::string_view _path, bool zUp)
+std::vector<Mesh> ModelImporter::load_from_file(std::string_view _path, bool zUp)
 {
     Assimp::Importer importer;
 
@@ -44,39 +41,19 @@ std::shared_ptr<Model> ModelManager::load_from_file(std::string_view _path, bool
     if (!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode)
     {
         spdlog::error("failed to load model {}: {}", _path, importer.GetErrorString());
-        return nullptr;
+        return {};
     }
 
-    auto model = std::make_shared<Model>();
+    auto meshes = std::vector<Mesh>{};
-
-    const std::filesystem::path modelPath = {_path};
-    for (unsigned int i = 0; i < scene->mNumMaterials; i++) {
-        aiMaterial* aiMat = scene->mMaterials[i];
-        aiString matName;
-        if (aiMat->Get(AI_MATKEY_NAME, matName) && strcmp(matName.data, "DefaultMaterial") == 0) {
-            continue;
-        }
-        Material mat{};
-        process_ai_material(aiMat, mat, modelPath.parent_path());
-        model->materials.push_back(std::make_shared<Material>(mat));
-    }
 
     for (unsigned int i = 0; i < scene->mNumMeshes; i++) {
         aiMesh* aiMesh = scene->mMeshes[i];
         Mesh mesh{};
-        mesh.materialId = aiMesh->mMaterialIndex;
         process_ai_mesh(aiMesh, mesh);
-        model->meshes.push_back(std::make_shared<Mesh>(mesh));
+        meshes.push_back(mesh);
     }
 
-    auto transform = glm::identity<glm::mat4>();
+    return meshes;
-    if (zUp) {
-        transform = zUpMatrix;
-    }
-
-    process_ai_node(scene->mRootNode, scene, transform, model->root);
-
-    return model;
 }
 
 void process_ai_node(aiNode* aiNode, const aiScene* scene, glm::mat4 transform, ModelNode& node)
@@ -148,7 +125,7 @@ void process_ai_mesh(const aiMesh* aiMesh, Mesh& mesh)
     mesh = {positions, uvs, normals, indices};
 }
 
-void process_ai_material(const aiMaterial* aiMat, Material& mat, const std::filesystem::path& modelDirectory) {
+/*void process_ai_material(const aiMaterial* aiMat, Material& mat, const std::filesystem::path& modelDirectory) {
     aiString matName;
     aiReturn ret = aiMat->Get(AI_MATKEY_NAME, matName);
     if (ret != AI_SUCCESS) {
@@ -193,9 +170,9 @@ void process_ai_material(const aiMaterial* aiMat, Material& mat, const std::file
     mat.phong.diffuse = glm::vec3{diffuseColor.r, diffuseColor.g, diffuseColor.b};
     mat.phong.specular = glm::vec3{specularColor.r, specularColor.g, specularColor.b};
     mat.phong.shininess = shininess;
-}
+}*/
 
-void process_ai_material_diffuse(const aiMaterial *aiMat, Material& mat, const std::filesystem::path& modelDirectory) {
+/*void process_ai_material_diffuse(const aiMaterial *aiMat, Material& mat, const std::filesystem::path& modelDirectory) {
     aiString aiTextureName;
     aiMat->GetTexture(aiTextureType_DIFFUSE, 0, &aiTextureName);
     std::string textureName = aiTextureName.C_Str();
@@ -259,4 +236,4 @@ void process_ai_material_specular(const aiMaterial *aiMat, Material& mat, const
     } else {
         mat.specular = TextureManager::textures["default_specular"];
     }
-}
+}*/

src/ModelImporter.h

@@ -0,0 +1,19 @@
+//
+// Created by lbmas on 4/29/2026.
+//
+
+#ifndef B_ENGINE_MODELIMPORTER_H
+#define B_ENGINE_MODELIMPORTER_H
+
+#include <string_view>
+
+#include "Model.h"
+
+class ModelImporter
+{
+public:
+    static std::vector<Mesh> load_from_file(std::string_view _path, bool zUp = false);
+};
+
+
+#endif //B_ENGINE_MODELIMPORTER_H

src/ModelManager.h

@@ -1,22 +0,0 @@
-//
-// Created by lbmas on 4/29/2026.
-//
-
-#ifndef B_ENGINE_MODELLOADER_H
-#define B_ENGINE_MODELLOADER_H
-
-#include <memory>
-#include <string_view>
-
-#include "Model.h"
-
-class ModelManager
-{
-public:
-    static std::unordered_map<std::string, std::shared_ptr<Model>> models;
-
-    static std::shared_ptr<Model> load_from_file(std::string_view _path, bool zUp = false);
-};
-
-
-#endif //B_ENGINE_MODELLOADER_H

src/ProjectManifest.h

@@ -0,0 +1,19 @@
+//
+// Created by lbmas on 5/13/2026.
+//
+
+#ifndef B_ENGINE_PROJECTMANIFEST_H
+#define B_ENGINE_PROJECTMANIFEST_H
+
+#include <string>
+#include <filesystem>
+
+typedef struct
+{
+    std::string name;
+    std::string assetFolder;
+
+    std::filesystem::path projectDirectory;
+} ProjectManifest;
+
+#endif //B_ENGINE_PROJECTMANIFEST_H

src/ProjectManifestFile.cpp

@@ -0,0 +1,38 @@
+//
+// Created by slinky on 5/14/26.
+//
+
+#include "ProjectManifestFile.h"
+
+#include <fstream>
+
+#include "spdlog/spdlog.h"
+#include "nlohmann/json.hpp"
+
+using json = nlohmann::json;
+
+std::unique_ptr<ProjectManifest> ProjectManifestFile::load(std::string_view _path) {
+    std::ifstream file;
+    file.open(_path.data(), std::ios::in);
+    if (!file.is_open()) {
+        spdlog::error("failed to open project file {}", _path);
+        return nullptr;
+    }
+
+    std::stringstream ss;
+    ss << file.rdbuf();
+
+    std::string fileData = ss.str();
+
+    auto data = json::parse(fileData);
+
+    ProjectManifest manifest;
+    manifest.name = data.at("name").get<std::string>();
+    manifest.assetFolder = data.at("assetFolder").get<std::string>();
+
+    return std::make_unique<ProjectManifest>(manifest);
+}
+
+bool ProjectManifestFile::save(std::string_view _path, ProjectManifest *_project) {
+    return true;
+}

src/ProjectManifestFile.h

@@ -0,0 +1,19 @@
+//
+// Created by slinky on 5/14/26.
+//
+
+#ifndef B_ENGINE_PROJECTMANIFESTFILE_H
+#define B_ENGINE_PROJECTMANIFESTFILE_H
+
+#include <string_view>
+#include <memory>
+
+#include "ProjectManifest.h"
+
+class ProjectManifestFile {
+public:
+    static std::unique_ptr<ProjectManifest> load(std::string_view _path);
+    static bool save(std::string_view _path, ProjectManifest* _project);
+};
+
+#endif //B_ENGINE_PROJECTMANIFESTFILE_H

src/ResourceHandle.h

@@ -0,0 +1,36 @@
+//
+// Created by slinky on 5/17/26.
+//
+
+#ifndef B_ENGINE_RESOURCEHANDLE_H
+#define B_ENGINE_RESOURCEHANDLE_H
+
+#include "uuid.h"
+
+struct ResourceHandle {
+    uuids::uuid assetUUID;
+    uint32_t localId = 0;
+
+    bool operator==(const ResourceHandle& other) const {
+        return assetUUID == other.assetUUID && localId == other.localId;
+    }
+
+    ResourceHandle() = default;
+
+    ResourceHandle(const uuids::uuid& uuid, int id) : assetUUID(uuid), localId(id) {}
+};
+
+namespace std {
+    template<>
+    struct hash<ResourceHandle> {
+        size_t operator()(const ResourceHandle& handle) const noexcept {
+            // Use the UUID library's native hash function
+            size_t h1 = std::hash<uuids::uuid>{}(handle.assetUUID);
+            size_t h2 = std::hash<uint32_t>{}(handle.localId);
+
+            return h1 ^ h2 + 0x9e3779b9 + (h1 << 6) + (h1 >> 2);
+        }
+    };
+}
+
+#endif //B_ENGINE_RESOURCEHANDLE_H

src/Scene.cpp

@@ -5,6 +5,11 @@
 #include "Scene.h"
 
 #include "Components.h"
+
+#include "MeshManager.h"
+#include "MaterialManager.h"
+#include "ShaderManager.h"
+
 #include "fmt/format.h"
 
 Scene::Scene() {
@@ -18,11 +23,15 @@ entt::entity Scene::create_game_object() {
 }
 
 entt::entity Scene::create_game_object(entt::entity parent) {
+    if (parent == entt::null) {
+        parent = root;
+    }
+
     const entt::entity entity = _registry.create();
     attach_component<Components::Transform>(entity);
     attach_component<Components::Relationship>(entity);
-    auto& tag = attach_component<Components::Tag>(entity);
+    auto&[name] = attach_component<Components::Tag>(entity);
-    tag.name = fmt::format("entity {0}", (int)entity);
+    name = fmt::format("entity {0}", static_cast<int>(entity));
 
     add_child(parent, entity);
 
@@ -30,43 +39,98 @@ entt::entity Scene::create_game_object(entt::entity parent) {
 }
 
 void Scene::update_transforms() {
-
+    std::vector<entt::entity> children = get_children(root);
+    for (auto child: children) {
+        update_transforms(child);
+    }
 }
 
-void Scene::draw_scene(ShaderProgram *shader) {
+void Scene::update_transforms(entt::entity entity) {
-    auto view = _registry.view<Components::Transform, Components::Drawable>();
+    auto& transform = fetch_component<Components::Transform>(entity);
-    for (auto e : view) {
-        const auto& transform = view.get<Components::Transform>(e);
-        shader->setMat4("model", transform.model);
 
-        const auto& drawable = view.get<Components::Drawable>(e);
+    if (!transform.dirty)
-        const Model* model = drawable.model.get();
+        return;
-        for (const auto& mesh: drawable.model->meshes) {
-            unsigned int materialId = mesh->materialId;
-            if (materialId >= model->materials.size()) {
-                materialId = 0;
-            }
 
-            const std::shared_ptr<Material> mat = model->materials[materialId];
+    glm::mat4 translation =
+        glm::translate(glm::mat4(1.0f), transform.position);
 
-            shader->setVec3("phongAmbient",  mat->phong.ambient);
+    glm::mat4 rotationX =
-            shader->setVec3("phongDiffuse",  mat->phong.diffuse);
+        glm::rotate(glm::mat4(1.0f), transform.rotation.x, glm::vec3(1,0,0));
-            shader->setVec3("phongSpecular", mat->phong.specular);
-            shader->setFloat("phongShininess", mat->phong.shininess);
 
-            glActiveTexture(GL_TEXTURE0);
+    glm::mat4 rotationY =
-            const auto diffuse = mat->diffuse;
+        glm::rotate(glm::mat4(1.0f), transform.rotation.y, glm::vec3(0,1,0));
-            diffuse->bind();
-            shader->setInt("diffuseMap", 0);
 
-            glActiveTexture(GL_TEXTURE1);
+    glm::mat4 rotationZ =
-            const auto specular = mat->specular;
+        glm::rotate(glm::mat4(1.0f), transform.rotation.z, glm::vec3(0,0,1));
-            specular->bind();
-            shader->setInt("specularMap", 1);
 
-            glBindVertexArray(mesh.get()->vao);
+    glm::mat4 scaling =
-            glDrawElements(GL_TRIANGLES, mesh->numIndices, GL_UNSIGNED_INT, 0);
+        glm::scale(glm::mat4(1.0f), transform.scale);
+
+    glm::mat4 localModel =
+        translation *
+        rotationZ *
+        rotationY *
+        rotationX *
+        scaling;
+
+    auto& rel = fetch_component<Components::Relationship>(entity);
+    if (rel.parent != entt::null) {
+        auto& parentTransform = fetch_component<Components::Transform>(rel.parent);
+        transform.model = parentTransform.model * localModel;
+    } else {
+        transform.model = localModel;
+    }
+
+    transform.dirty = false;
+
+    std::vector<entt::entity> children = get_children(entity);
+    for (auto child: children) {
+        update_transforms(child);
+    }
+}
+
+void Scene::draw_scene() {
+    auto view = _registry.view<Components::Transform, Components::Mesh, Components::Material>();
+    for (const auto e : view) {
+        const auto&[matHandle] = view.get<Components::Material>(e);
+        const auto* mat = MaterialManager::materials[matHandle].get();
+
+        auto* program = ShaderManager::shaders[mat->shader].get();
+
+        program->bind();
+        program->setMat4("projection", activeCamera->projection());
+        program->setMat4("view", activeCamera->view());
+        program->setVec3("viewPosition", activeCamera->position());
+
+        auto dirLights = _registry.view<Components::DirectionalLight>();
+        for (const auto e : dirLights) {
+            auto dirLight = dirLights.get<Components::DirectionalLight>(e);
+            program->setVec3("lightDirection",  dirLight.direction);
+            program->setVec3("lightAmbient",  dirLight.ambient);
+            program->setVec3("lightDiffuse", dirLight.diffuse);
+            program->setVec3("lightSpecular", dirLight.specular);
+            break;
         }
+
+        program->setVec3("phongAmbient",  mat->phong.ambient);
+        program->setVec3("phongDiffuse",  mat->phong.diffuse);
+        program->setVec3("phongSpecular", mat->phong.specular);
+        program->setFloat("phongShininess", mat->phong.shininess);
+
+        glActiveTexture(GL_TEXTURE0);
+        const auto diffuseHandle = mat->diffuse;
+
+        glActiveTexture(GL_TEXTURE1);
+        const auto specularHandle = mat->specular;
+
+        const auto& transform = view.get<Components::Transform>(e);
+        program->setMat4("model", transform.model);
+
+        const auto&[meshHandle] = view.get<Components::Mesh>(e);
+        const auto* mesh = MeshManager::meshes[meshHandle].get();
+
+        glBindVertexArray(mesh->vao);
+        glDrawElements(GL_TRIANGLES, mesh->numIndices, GL_UNSIGNED_INT, 0);
     }
 }
 
@@ -74,6 +138,17 @@ entt::entity Scene::get_root() const {
     return root;
 }
 
+std::vector<entt::entity> Scene::get_children(entt::entity parent) {
+    std::vector<entt::entity> children{};
+    auto child = fetch_component<Components::Relationship>(parent).first_child;
+    while (child != entt::null) {
+        children.push_back(child);
+        const auto& relationship = fetch_component<Components::Relationship>(child);
+        child = relationship.next_sibling;
+    }
+    return children;
+}
+
 void Scene::add_child(entt::entity parent, entt::entity child) {
     auto& parentRelationship = fetch_component<Components::Relationship>(parent);
 
@@ -85,15 +160,19 @@ void Scene::add_child(entt::entity parent, entt::entity child) {
     }
 
     entt::entity lastSibling = parentRelationship.first_child;
-    auto& lastSiblingRelationship = fetch_component<Components::Relationship>(lastSibling);
+    auto* lastSiblingRelationship = &fetch_component<Components::Relationship>(lastSibling);
-    while (lastSiblingRelationship.next_sibling != entt::null) {
+    while (lastSiblingRelationship->next_sibling != entt::null) {
-        lastSibling = lastSiblingRelationship.next_sibling;
+        lastSibling = lastSiblingRelationship->next_sibling;
-        lastSiblingRelationship = fetch_component<Components::Relationship>(lastSibling);
+        lastSiblingRelationship = &fetch_component<Components::Relationship>(lastSibling);
     }
-    lastSiblingRelationship.next_sibling = child;
+    lastSiblingRelationship->next_sibling = child;
 
     auto& childRelationship = fetch_component<Components::Relationship>(child);
     childRelationship.prev_sibling = lastSibling;
     childRelationship.next_sibling = entt::null;
     childRelationship.parent = parent;
 }
+
+void Scene::set_active_camera(Camera *camera) {
+    activeCamera = camera;
+}

src/Scene.h

@@ -5,6 +5,7 @@
 #ifndef B_ENGINE_SCENE_H
 #define B_ENGINE_SCENE_H
 
+#include "Camera.h"
 #include "ShaderProgram.h"
 #include "entt/entt.hpp"
 
@@ -31,15 +32,26 @@ public:
         return _registry.get<T>(e);
     }
 
+    template<typename T>
+    bool has_component(entt::entity e) {
+        return _registry.all_of<T>(e);
+    }
+
     void update_transforms();
-    void draw_scene(ShaderProgram* program);
+    void draw_scene();
 
     [[nodiscard]] entt::entity get_root() const;
+    [[nodiscard]] std::vector<entt::entity> get_children(entt::entity parent);
+
+    void set_active_camera(Camera *camera);
 private:
     entt::registry _registry{};
     entt::entity root{entt::null};
 
     void add_child(entt::entity parent, entt::entity child);
+    void update_transforms(entt::entity parent);
+
+    Camera* activeCamera {nullptr};
 };
 
 #endif //B_ENGINE_SCENE_H

src/ShaderManager.cpp

@@ -14,9 +14,9 @@
 void log_shader_compile_errors(GLuint shader, std::string_view shaderType);
 void log_program_compile_errors(GLuint program);
 
-std::unordered_map<std::string, std::shared_ptr<ShaderProgram>> ShaderManager::shaders;
+std::unordered_map<ResourceHandle, std::unique_ptr<ShaderProgram>> ShaderManager::shaders;
 
-std::shared_ptr<ShaderProgram> ShaderManager::load(std::string_view vertexPath, std::string_view fragmentPath)
+std::unique_ptr<ShaderProgram> ShaderManager::load(std::string_view vertexPath, std::string_view fragmentPath)
 {
     std::string vertexSource;
     std::string fragmentSource;
@@ -24,8 +24,7 @@ std::shared_ptr<ShaderProgram> ShaderManager::load(std::string_view vertexPath,
     std::ifstream vertexFile {};
     std::ifstream fragmentFile {};
 
-    try
+    try {
-    {
         vertexFile.open(vertexPath.data());
         fragmentFile.open(fragmentPath.data());
 
@@ -39,8 +38,8 @@ std::shared_ptr<ShaderProgram> ShaderManager::load(std::string_view vertexPath,
 
         vertexFile.close();
         fragmentFile.close();
-    } catch (std::ifstream::failure& e) {
+    } catch (std::fstream::failure& e) {
-        spdlog::error("Failed to load shader program {}, {}: {}", vertexPath, fragmentPath, std::string(e.what()).c_str());
+        spdlog::error("Failed to load shader program {}, {}: {}", vertexPath, fragmentPath, e.what());
         return nullptr;
     }
 
@@ -69,7 +68,7 @@ std::shared_ptr<ShaderProgram> ShaderManager::load(std::string_view vertexPath,
     glDeleteShader(vertex);
     glDeleteShader(fragment);
 
-    return std::make_shared<ShaderProgram>(ShaderProgram(shaderId));
+    return std::make_unique<ShaderProgram>(shaderId);
 }
 
 void log_shader_compile_errors(GLuint shader, std::string_view shaderType)

src/ShaderManager.h

@@ -5,17 +5,17 @@
 #ifndef B_ENGINE_SHADERMANAGER_H
 #define B_ENGINE_SHADERMANAGER_H
 
-#include <string>
 #include <string_view>
 #include <memory>
 
+#include "ResourceHandle.h"
 #include "ShaderProgram.h"
 
 class ShaderManager {
 public:
-    static std::unordered_map<std::string, std::shared_ptr<ShaderProgram>> shaders;
+    static std::unordered_map<ResourceHandle, std::unique_ptr<ShaderProgram>> shaders;
+    static std::unique_ptr<ShaderProgram> load(std::string_view vertexPath, std::string_view fragmentPath);
 
-    static std::shared_ptr<ShaderProgram> load(std::string_view vertexPath, std::string_view fragmentPath);
 };
 
 #endif //B_ENGINE_SHADERMANAGER_H

src/TextureManager.cpp

@@ -10,10 +10,9 @@
 
 #include "glad/gl.h"
 
-std::unordered_map<std::string, std::shared_ptr<Texture>> TextureManager::textures;
+std::unordered_map<ResourceHandle, std::unique_ptr<Texture>> TextureManager::textures;
 
-std::shared_ptr<Texture> TextureManager::load_from_file(std::string_view filePath)
+std::unique_ptr<Texture> TextureManager::load_from_file(const std::string_view filePath) {
-{
     int width, height, channels;
     unsigned char *data = stbi_load(filePath.data(), &width, &height, &channels, 0);
 
@@ -38,10 +37,10 @@ std::shared_ptr<Texture> TextureManager::load_from_file(std::string_view filePat
 
     stbi_image_free(data);
 
-    return std::make_shared<Texture>(textureID, filePath, width, height, channels);
+    return std::make_unique<Texture>(textureID, filePath, width, height, channels);
 }
 
-std::shared_ptr<Texture> TextureManager::load_from_data(unsigned char* data, int width, int height, int channels)
+std::unique_ptr<Texture> TextureManager::load_from_data(unsigned char* data, int width, int height, int channels)
 {
     unsigned int textureID = 0;
     glGenTextures(1, &textureID);
@@ -57,5 +56,5 @@ std::shared_ptr<Texture> TextureManager::load_from_data(unsigned char* data, int
     glTexImage2D(GL_TEXTURE_2D, 0, (GLint)format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
     glGenerateMipmap(GL_TEXTURE_2D);
 
-    return std::make_shared<Texture>(textureID, "memory", width, height, channels);
+    return std::make_unique<Texture>(textureID, "memory", width, height, channels);
 }

src/TextureManager.h

@@ -8,14 +8,15 @@
 #include <memory>
 #include <unordered_map>
 
+#include "ResourceHandle.h"
 #include "Texture.h"
 
 class TextureManager {
 public:
-    static std::unordered_map<std::string, std::shared_ptr<Texture>> textures;
+    static std::unordered_map<ResourceHandle, std::unique_ptr<Texture>> textures;
 
-    static std::shared_ptr<Texture> load_from_file(std::string_view filePath);
+    static std::unique_ptr<Texture> load_from_file(std::string_view filePath);
-    static std::shared_ptr<Texture> load_from_data(unsigned char* data, int width, int height, int channels);
+    static std::unique_ptr<Texture> load_from_data(unsigned char* data, int width, int height, int channels);
 };
 
 #endif //B_ENGINE_TEXTUREMANAGER_H

src/Types.h

@@ -0,0 +1,16 @@
+//
+// Created by slinky on 5/14/26.
+//
+
+#ifndef B_ENGINE_TYPES_H
+#define B_ENGINE_TYPES_H
+
+enum class AssetType {
+    UNKNOWN = 0,
+    DIRECTORY = 1,
+    SHADER = 2,
+    TEXTURE = 3,
+    MODEL = 4
+};
+
+#endif //B_ENGINE_TYPES_H

src/UIManager.cpp

@@ -0,0 +1,88 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#include "UIManager.h"
+
+#include <ranges>
+
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+#include "imgui_internal.h"
+
+std::unordered_map<std::string, std::shared_ptr<IUIPanel>> UIManager::uiPanels {};
+GLFWwindow* UIManager::window {nullptr};
+bool UIManager::updateDockspace {true};
+
+void UIManager::init(GLFWwindow* _window) {
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+    ImGui::StyleColorsDark();
+    ImGui_ImplGlfw_InitForOpenGL(_window, true);
+    ImGui_ImplOpenGL3_Init("#version 400");
+
+    window = _window;
+}
+
+void UIManager::update(EditorContext& ctx) {
+    ImGui_ImplOpenGL3_NewFrame();
+    ImGui_ImplGlfw_NewFrame();
+
+    ImGui::NewFrame();
+    {
+        ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
+        ImGuiViewport* viewport = ImGui::GetMainViewport();
+        ImGui::SetNextWindowPos(viewport->Pos);
+        ImGui::SetNextWindowSize(viewport->Size);
+        ImGui::SetNextWindowViewport(viewport->ID);
+
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
+        window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
+        window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
+
+        ImGui::Begin("b_engine dockspace", nullptr, window_flags);
+        ImGui::PopStyleVar(2);
+
+        ImGuiID dockspace_id = ImGui::GetID("bengine_dockspace");
+        ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), ImGuiDockNodeFlags_None);
+
+        if (updateDockspace) {
+            updateDockspace = false;
+
+            ImGui::DockBuilderRemoveNode(dockspace_id);
+            ImGui::DockBuilderAddNode(dockspace_id, ImGuiDockNodeFlags_DockSpace);
+            ImGui::DockBuilderSetNodeSize(dockspace_id, viewport->Size);
+
+            ImGuiID dock_main_id = dockspace_id;
+
+            const ImGuiID dock_id_left =
+                ImGui::DockBuilderSplitNode(dock_main_id, ImGuiDir_Left, 0.2f, nullptr, &dock_main_id);
+            const ImGuiID dock_id_right =
+                ImGui::DockBuilderSplitNode(dock_main_id, ImGuiDir_Right, 0.25f, nullptr, &dock_main_id);
+
+            ImGui::DockBuilderDockWindow("Hierarchy", dock_id_left);
+            ImGui::DockBuilderDockWindow("Inspector", dock_id_right);
+            ImGui::DockBuilderDockWindow("Scene", dock_main_id);
+
+            ImGui::DockBuilderFinish(dockspace_id);
+        }
+
+        for (const auto &panel: uiPanels | std::views::values) {
+            if (!panel) continue;
+            panel->update(ctx);
+        }
+
+        ImGui::End(); // dockspace
+    }
+    ImGui::Render();
+}
+
+void UIManager::draw() {
+    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+}

src/UIManager.h

@@ -0,0 +1,42 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_UIMANAGER_H
+#define B_ENGINE_UIMANAGER_H
+
+#include <vector>
+#include <memory>
+#include <unordered_map>
+#include <functional>
+
+#include "EditorContext.h"
+#include "GLFW/glfw3.h"
+#include "ui/IUIPanel.h"
+
+class UIManager {
+public:
+    static void init(GLFWwindow* _window);
+    static void update(EditorContext& ctx);
+    static void draw();
+
+    template<typename T = IUIPanel, typename... Args>
+    static T* add_ui_panel(std::string_view id, Args &&... args) {
+        uiPanels[std::string(id)] = std::make_shared<T>(std::forward<Args>(args)...);
+        return dynamic_cast<T*>(uiPanels[std::string(id)].get());
+    }
+
+    static std::shared_ptr<IUIPanel> get_ui_panel(std::string_view id) {
+        if (const auto it = uiPanels.find(std::string(id)); it != uiPanels.end()) {
+            return it->second;
+        }
+        return nullptr;
+    }
+private:
+    static bool updateDockspace;
+    static GLFWwindow* window;
+    static std::unordered_map<std::string, std::shared_ptr<IUIPanel>> uiPanels;
+};
+
+
+#endif //B_ENGINE_UIMANAGER_H

src/imgui/imconfig.h

@@ -0,0 +1,147 @@
+//-----------------------------------------------------------------------------
+// DEAR IMGUI COMPILE-TIME OPTIONS
+// Runtime options (clipboard callbacks, enabling various features, etc.) can generally be set via the ImGuiIO structure.
+// You can use ImGui::SetAllocatorFunctions() before calling ImGui::CreateContext() to rewire memory allocation functions.
+//-----------------------------------------------------------------------------
+// A) You may edit imconfig.h (and not overwrite it when updating Dear ImGui, or maintain a patch/rebased branch with your modifications to it)
+// B) or '#define IMGUI_USER_CONFIG "my_imgui_config.h"' in your project and then add directives in your own file without touching this template.
+//-----------------------------------------------------------------------------
+// You need to make sure that configuration settings are defined consistently _everywhere_ Dear ImGui is used, which include the imgui*.cpp
+// files but also _any_ of your code that uses Dear ImGui. This is because some compile-time options have an affect on data structures.
+// Defining those options in imconfig.h will ensure every compilation unit gets to see the same data structure layouts.
+// Call IMGUI_CHECKVERSION() from your .cpp file to verify that the data structures your files are using are matching the ones imgui.cpp is using.
+//-----------------------------------------------------------------------------
+
+#pragma once
+
+//---- Define assertion handler. Defaults to calling assert().
+// - If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
+// - Compiling with NDEBUG will usually strip out assert() to nothing, which is NOT recommended because we use asserts to notify of programmer mistakes.
+//#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
+//#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
+
+//---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
+// Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
+// - Windows DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
+//   for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
+//#define IMGUI_API __declspec(dllexport)                   // MSVC Windows: DLL export
+//#define IMGUI_API __declspec(dllimport)                   // MSVC Windows: DLL import
+//#define IMGUI_API __attribute__((visibility("default")))  // GCC/Clang: override visibility when set is hidden
+
+//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to clean your code of obsolete function/names.
+//#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+
+//---- Disable all of Dear ImGui or don't implement standard windows/tools.
+// It is very strongly recommended to NOT disable the demo windows and debug tool during development. They are extremely useful in day to day work. Please read comments in imgui_demo.cpp.
+//#define IMGUI_DISABLE                                     // Disable everything: all headers and source files will be empty.
+//#define IMGUI_DISABLE_DEMO_WINDOWS                        // Disable demo windows: ShowDemoWindow()/ShowStyleEditor() will be empty.
+//#define IMGUI_DISABLE_DEBUG_TOOLS                         // Disable metrics/debugger and other debug tools: ShowMetricsWindow(), ShowDebugLogWindow() and ShowIDStackToolWindow() will be empty.
+
+//---- Don't implement some functions to reduce linkage requirements.
+//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc. (user32.lib/.a, kernel32.lib/.a)
+//#define IMGUI_ENABLE_WIN32_DEFAULT_IME_FUNCTIONS          // [Win32] [Default with Visual Studio] Implement default IME handler (require imm32.lib/.a, auto-link for Visual Studio, -limm32 on command-line for MinGW)
+//#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] [Default with non-Visual Studio compilers] Don't implement default IME handler (won't require imm32.lib/.a)
+//#define IMGUI_DISABLE_WIN32_FUNCTIONS                     // [Win32] Won't use and link with any Win32 function (clipboard, IME).
+//#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS      // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
+//#define IMGUI_DISABLE_DEFAULT_SHELL_FUNCTIONS             // Don't implement default platform_io.Platform_OpenInShellFn() handler (Win32: ShellExecute(), require shell32.lib/.a, Mac/Linux: use system("")).
+//#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
+//#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
+//#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
+//#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
+//#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
+//#define IMGUI_DISABLE_DEFAULT_FONT                        // Disable default embedded fonts (ProggyClean/ProggyForever), remove ~9 KB + ~14 KB from output binary. AddFontDefaultXXX() functions will assert.
+//#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
+
+//---- Enable Test Engine / Automation features.
+//#define IMGUI_ENABLE_TEST_ENGINE                          // Enable imgui_test_engine hooks. Generally set automatically by include "imgui_te_config.h", see Test Engine for details.
+
+//---- Include imgui_user.h at the end of imgui.h as a convenience
+// May be convenient for some users to only explicitly include vanilla imgui.h and have extra stuff included.
+//#define IMGUI_INCLUDE_IMGUI_USER_H
+//#define IMGUI_USER_H_FILENAME         "my_folder/my_imgui_user.h"
+
+//---- Pack vertex colors as BGRA8 instead of RGBA8 (to avoid converting from one to another). Need dedicated backend support.
+//#define IMGUI_USE_BGRA_PACKED_COLOR
+
+//---- Use legacy CRC32-adler tables (used before 1.91.6), in order to preserve old .ini data that you cannot afford to invalidate.
+//#define IMGUI_USE_LEGACY_CRC32_ADLER
+
+//---- Use 32-bit for ImWchar (default is 16-bit) to support Unicode planes 1-16. (e.g. point beyond 0xFFFF like emoticons, dingbats, symbols, shapes, ancient languages, etc...)
+//#define IMGUI_USE_WCHAR32
+
+//---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
+// By default the embedded implementations are declared static and not available outside of Dear ImGui sources files.
+//#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
+//#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
+//#define IMGUI_STB_SPRINTF_FILENAME    "my_folder/stb_sprintf.h"    // only used if IMGUI_USE_STB_SPRINTF is defined.
+//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_SPRINTF_IMPLEMENTATION                   // only disabled if IMGUI_USE_STB_SPRINTF is defined.
+
+//---- Use stb_sprintf.h for a faster implementation of vsnprintf instead of the one from libc (unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined)
+// Compatibility checks of arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by stb_sprintf.h.
+//#define IMGUI_USE_STB_SPRINTF
+
+//---- Use FreeType to build and rasterize the font atlas (instead of stb_truetype which is embedded by default in Dear ImGui)
+// Requires FreeType headers to be available in the include path. Requires program to be compiled with 'misc/freetype/imgui_freetype.cpp' (in this repository) + the FreeType library (not provided).
+// Note that imgui_freetype.cpp may be used _without_ this define, if you manually call ImFontAtlas::SetFontLoader(). The define is simply a convenience.
+// On Windows you may use vcpkg with 'vcpkg install freetype --triplet=x64-windows' + 'vcpkg integrate install'.
+//#define IMGUI_ENABLE_FREETYPE
+
+//---- Use FreeType + plutosvg or lunasvg to render OpenType SVG fonts (SVGinOT)
+// Only works in combination with IMGUI_ENABLE_FREETYPE.
+// - plutosvg is currently easier to install, as e.g. it is part of vcpkg. It will support more fonts and may load them faster. See misc/freetype/README for instructions.
+// - Both require headers to be available in the include path + program to be linked with the library code (not provided).
+// - (note: lunasvg implementation is based on Freetype's rsvg-port.c which is licensed under CeCILL-C Free Software License Agreement)
+//#define IMGUI_ENABLE_FREETYPE_PLUTOSVG
+//#define IMGUI_ENABLE_FREETYPE_LUNASVG
+
+//---- Use stb_truetype to build and rasterize the font atlas (default)
+// The only purpose of this define is if you want force compilation of the stb_truetype backend ALONG with the FreeType backend.
+//#define IMGUI_ENABLE_STB_TRUETYPE
+
+//---- Define constructor and implicit cast operators to convert back<>forth between your math types and ImVec2/ImVec4.
+// This will be inlined as part of ImVec2 and ImVec4 class declarations.
+/*
+#define IM_VEC2_CLASS_EXTRA                                                     \
+        constexpr ImVec2(const MyVec2& f) : x(f.x), y(f.y) {}                   \
+        operator MyVec2() const { return MyVec2(x,y); }
+
+#define IM_VEC4_CLASS_EXTRA                                                     \
+        constexpr ImVec4(const MyVec4& f) : x(f.x), y(f.y), z(f.z), w(f.w) {}   \
+        operator MyVec4() const { return MyVec4(x,y,z,w); }
+*/
+//---- ...Or use Dear ImGui's own very basic math operators.
+//#define IMGUI_DEFINE_MATH_OPERATORS
+
+//---- Use 32-bit vertex indices (default is 16-bit) is one way to allow large meshes with more than 64K vertices.
+// Your renderer backend will need to support it (most example renderer backends support both 16/32-bit indices).
+// Another way to allow large meshes while keeping 16-bit indices is to handle ImDrawCmd::VtxOffset in your renderer.
+// Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
+//#define ImDrawIdx unsigned int
+
+//---- Override ImDrawCallback signature (will need to modify renderer backends accordingly)
+//struct ImDrawList;
+//struct ImDrawCmd;
+//typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
+//#define ImDrawCallback MyImDrawCallback
+
+//---- Debug Tools: Macro to break in Debugger (we provide a default implementation of this in the codebase)
+// (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
+//#define IM_DEBUG_BREAK  IM_ASSERT(0)
+//#define IM_DEBUG_BREAK  __debugbreak()
+
+//---- Debug Tools: Enable highlight ID conflicts _before_ hovering items. When io.ConfigDebugHighlightIdConflicts is set.
+// (THIS WILL SLOW DOWN DEAR IMGUI. Only use occasionally and disable after use)
+//#define IMGUI_DEBUG_HIGHLIGHT_ALL_ID_CONFLICTS
+
+//---- Debug Tools: Enable slower asserts
+//#define IMGUI_DEBUG_PARANOID
+
+//---- Tip: You can add extra functions within the ImGui:: namespace from anywhere (e.g. your own sources/header files)
+/*
+namespace ImGui
+{
+    void MyFunction(const char* name, MyMatrix44* mtx);
+}
+*/

src/imgui/imgui_impl_glfw.h

@@ -0,0 +1,73 @@
+// dear imgui: Platform Backend for GLFW
+// This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan, WebGPU..)
+// (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
+// (Requires: GLFW 3.0+. Prefer GLFW 3.3+/3.4+ for full feature support.)
+
+// Implemented features:
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Mouse support. Can discriminate Mouse/TouchScreen/Pen (Windows only).
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLFW_KEY_* values are obsolete since 1.87 and not supported since 1.91.5]
+//  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [X] Platform: Mouse cursor shape and visibility (ImGuiBackendFlags_HasMouseCursors) with GLFW 3.1+. Resizing cursors requires GLFW 3.4+! Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Multiple Dear ImGui contexts support.
+// Missing features or Issues:
+//  [ ] Platform: Touch events are only correctly identified as Touch on Windows. This create issues with some interactions. GLFW doesn't provide a way to identify touch inputs from mouse inputs, we cannot call io.AddMouseSourceEvent() to identify the source. We provide a Windows-specific workaround.
+//  [ ] Platform: Missing ImGuiMouseCursor_Wait and ImGuiMouseCursor_Progress cursors.
+//  [ ] Platform: Multi-viewport: Missing ImGuiBackendFlags_HasParentViewport support. The viewport->ParentViewportID field is ignored, and therefore io.ConfigViewportsNoDefaultParent has no effect either.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// Learn about Dear ImGui:
+// - FAQ                  https://dearimgui.com/faq
+// - Getting Started      https://dearimgui.com/getting-started
+// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
+// - Introduction, links and more at the top of imgui.cpp
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+#ifndef IMGUI_DISABLE
+
+struct GLFWwindow;
+struct GLFWmonitor;
+
+// Follow "Getting Started" link and check examples/ folder to learn about using backends!
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForOther(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplGlfw_NewFrame();
+
+// Emscripten related initialization phase methods (call after ImGui_ImplGlfw_InitForOpenGL)
+#ifdef __EMSCRIPTEN__
+IMGUI_IMPL_API void     ImGui_ImplGlfw_InstallEmscriptenCallbacks(GLFWwindow* window, const char* canvas_selector);
+//static inline void    ImGui_ImplGlfw_InstallEmscriptenCanvasResizeCallback(const char* canvas_selector) { ImGui_ImplGlfw_InstallEmscriptenCallbacks(nullptr, canvas_selector); } } // Renamed in 1.91.0
+#endif
+
+// GLFW callbacks install
+// - When calling Init with 'install_callbacks=true': ImGui_ImplGlfw_InstallCallbacks() is called. GLFW callbacks will be installed for you. They will chain-call user's previously installed callbacks, if any.
+// - When calling Init with 'install_callbacks=false': GLFW callbacks won't be installed. You will need to call individual function yourself from your own GLFW callbacks.
+IMGUI_IMPL_API void     ImGui_ImplGlfw_InstallCallbacks(GLFWwindow* window);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_RestoreCallbacks(GLFWwindow* window);
+
+// GLFW callbacks options:
+// - Set 'chain_for_all_windows=true' to enable chaining callbacks for all windows (including secondary viewports created by backends or by user)
+IMGUI_IMPL_API void     ImGui_ImplGlfw_SetCallbacksChainForAllWindows(bool chain_for_all_windows);
+
+// GLFW callbacks (individual callbacks to call yourself if you didn't install callbacks)
+IMGUI_IMPL_API void     ImGui_ImplGlfw_WindowFocusCallback(GLFWwindow* window, int focused);        // Since 1.84
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CursorEnterCallback(GLFWwindow* window, int entered);        // Since 1.84
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y);   // Since 1.87
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MonitorCallback(GLFWmonitor* monitor, int event);
+
+// GLFW helpers
+IMGUI_IMPL_API void     ImGui_ImplGlfw_Sleep(int milliseconds);
+IMGUI_IMPL_API float    ImGui_ImplGlfw_GetContentScaleForWindow(GLFWwindow* window);
+IMGUI_IMPL_API float    ImGui_ImplGlfw_GetContentScaleForMonitor(GLFWmonitor* monitor);
+
+
+#endif // #ifndef IMGUI_DISABLE

src/imgui/imgui_impl_opengl3.h

@@ -0,0 +1,69 @@
+// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
+// - Desktop GL: 2.x 3.x 4.x
+// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!
+//  [x] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset) [Desktop OpenGL only!]
+//  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// About WebGL/ES:
+// - You need to '#define IMGUI_IMPL_OPENGL_ES2' or '#define IMGUI_IMPL_OPENGL_ES3' to use WebGL or OpenGL ES.
+// - This is done automatically on iOS, Android and Emscripten targets.
+// - For other targets, the define needs to be visible from the imgui_impl_opengl3.cpp compilation unit. If unsure, define globally or in imconfig.h.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// Learn about Dear ImGui:
+// - FAQ                  https://dearimgui.com/faq
+// - Getting Started      https://dearimgui.com/getting-started
+// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
+// - Introduction, links and more at the top of imgui.cpp
+
+// About GLSL version:
+//  The 'glsl_version' initialization parameter should be nullptr (default) or a "#version XXX" string.
+//  On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"
+//  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+#ifndef IMGUI_DISABLE
+
+// Follow "Getting Started" link and check examples/ folder to learn about using backends!
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = nullptr);
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);
+
+// (Optional) Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
+
+// (Advanced) Use e.g. if you need to precisely control the timing of texture updates (e.g. for staged rendering), by setting ImDrawData::Textures = nullptr to handle this manually.
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_UpdateTexture(ImTextureData* tex);
+
+// Configuration flags to add in your imconfig file:
+//#define IMGUI_IMPL_OPENGL_ES2     // Enable ES 2 (Auto-detected on Emscripten)
+//#define IMGUI_IMPL_OPENGL_ES3     // Enable ES 3 (Auto-detected on iOS/Android)
+
+// You can explicitly select GLES2 or GLES3 API by using one of the '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
+#if !defined(IMGUI_IMPL_OPENGL_ES2) \
+ && !defined(IMGUI_IMPL_OPENGL_ES3)
+
+// Try to detect GLES on matching platforms
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))
+#define IMGUI_IMPL_OPENGL_ES3               // iOS, Android  -> GL ES 3, "#version 300 es"
+#elif defined(__EMSCRIPTEN__) || defined(__amigaos4__)
+#define IMGUI_IMPL_OPENGL_ES2               // Emscripten    -> GL ES 2, "#version 100"
+#else
+// Otherwise imgui_impl_opengl3_loader.h will be used.
+#endif
+
+#endif
+
+#endif // #ifndef IMGUI_DISABLE

src/imgui/imgui_impl_opengl3_loader.h

@@ -0,0 +1,958 @@
+//-----------------------------------------------------------------------------
+// About imgui_impl_opengl3_loader.h:
+//
+// We embed our own OpenGL loader to not require user to provide their own or to have to use ours,
+// which proved to be endless problems for users.
+// Our loader is custom-generated, based on gl3w but automatically filtered to only include
+// enums/functions that we use in our imgui_impl_opengl3.cpp source file in order to be small.
+//
+// YOU SHOULD NOT NEED TO INCLUDE/USE THIS DIRECTLY. THIS IS USED BY imgui_impl_opengl3.cpp ONLY.
+// THE REST OF YOUR APP SHOULD USE A DIFFERENT GL LOADER: ANY GL LOADER OF YOUR CHOICE.
+//
+// IF YOU GET BUILD ERRORS IN THIS FILE (commonly macro redefinitions or function redefinitions):
+// IT LIKELY MEANS THAT YOU ARE BUILDING 'imgui_impl_opengl3.cpp' OR INCLUDING 'imgui_impl_opengl3_loader.h'
+// IN THE SAME COMPILATION UNIT AS ONE OF YOUR FILE WHICH IS USING A THIRD-PARTY OPENGL LOADER.
+// (e.g. COULD HAPPEN IF YOU ARE DOING A UNITY/JUMBO BUILD, OR INCLUDING .CPP FILES FROM OTHERS)
+// YOU SHOULD NOT BUILD BOTH IN THE SAME COMPILATION UNIT.
+// BUT IF YOU REALLY WANT TO, you can '#define IMGUI_IMPL_OPENGL_LOADER_CUSTOM' and imgui_impl_opengl3.cpp
+// WILL NOT BE USING OUR LOADER, AND INSTEAD EXPECT ANOTHER/YOUR LOADER TO BE AVAILABLE IN THE COMPILATION UNIT.
+//
+// Regenerate with:
+//   python3 gl3w_gen.py --output ../imgui/backends/imgui_impl_opengl3_loader.h --ref ../imgui/backends/imgui_impl_opengl3.cpp ./extra_symbols.txt
+//
+// More info:
+//   https://github.com/dearimgui/gl3w_stripped
+//   https://github.com/ocornut/imgui/issues/4445
+//-----------------------------------------------------------------------------
+
+/*
+ * This file was generated with gl3w_gen.py, part of imgl3w
+ * (hosted at https://github.com/dearimgui/gl3w_stripped)
+ *
+ * This is free and unencumbered software released into the public domain.
+ *
+ * Anyone is free to copy, modify, publish, use, compile, sell, or
+ * distribute this software, either in source code form or as a compiled
+ * binary, for any purpose, commercial or non-commercial, and by any
+ * means.
+ *
+ * In jurisdictions that recognize copyright laws, the author or authors
+ * of this software dedicate any and all copyright interest in the
+ * software to the public domain. We make this dedication for the benefit
+ * of the public at large and to the detriment of our heirs and
+ * successors. We intend this dedication to be an overt act of
+ * relinquishment in perpetuity of all present and future rights to this
+ * software under copyright law.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __gl3w_h_
+#define __gl3w_h_
+
+// Adapted from KHR/khrplatform.h to avoid including entire file.
+#ifndef __khrplatform_h_
+typedef          float         khronos_float_t;
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+#ifdef _WIN64
+typedef signed   long long int khronos_intptr_t;
+typedef signed   long long int khronos_ssize_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef signed   long  int     khronos_ssize_t;
+#endif
+
+#if defined(_MSC_VER) && !defined(__clang__)
+typedef signed   __int64       khronos_int64_t;
+typedef unsigned __int64       khronos_uint64_t;
+#elif (defined(__clang__) || defined(__GNUC__)) && (__cplusplus < 201100)
+#include <stdint.h>
+typedef          int64_t       khronos_int64_t;
+typedef          uint64_t      khronos_uint64_t;
+#else
+typedef signed   long long     khronos_int64_t;
+typedef unsigned long long     khronos_uint64_t;
+#endif
+#endif  // __khrplatform_h_
+
+#ifndef __gl_glcorearb_h_
+#define __gl_glcorearb_h_ 1
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+** Copyright 2013-2020 The Khronos Group Inc.
+** SPDX-License-Identifier: MIT
+**
+** This header is generated from the Khronos OpenGL / OpenGL ES XML
+** API Registry. The current version of the Registry, generator scripts
+** used to make the header, and the header can be found at
+**   https://github.com/KhronosGroup/OpenGL-Registry
+*/
+#if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__)
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN 1
+#endif
+#include <windows.h>
+#endif
+#ifndef APIENTRY
+#define APIENTRY
+#endif
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
+#ifndef GLAPI
+#define GLAPI extern
+#endif
+/* glcorearb.h is for use with OpenGL core profile implementations.
+** It should should be placed in the same directory as gl.h and
+** included as <GL/glcorearb.h>.
+**
+** glcorearb.h includes only APIs in the latest OpenGL core profile
+** implementation together with APIs in newer ARB extensions which 
+** can be supported by the core profile. It does not, and never will
+** include functionality removed from the core profile, such as
+** fixed-function vertex and fragment processing.
+**
+** Do not #include both <GL/glcorearb.h> and either of <GL/gl.h> or
+** <GL/glext.h> in the same source file.
+*/
+/* Generated C header for:
+ * API: gl
+ * Profile: core
+ * Versions considered: .*
+ * Versions emitted: .*
+ * Default extensions included: glcore
+ * Additional extensions included: _nomatch_^
+ * Extensions removed: _nomatch_^
+ */
+#ifndef GL_VERSION_1_0
+typedef void GLvoid;
+typedef unsigned int GLenum;
+
+typedef khronos_float_t GLfloat;
+typedef int GLint;
+typedef int GLsizei;
+typedef unsigned int GLbitfield;
+typedef double GLdouble;
+typedef unsigned int GLuint;
+typedef unsigned char GLboolean;
+typedef khronos_uint8_t GLubyte;
+#define GL_COLOR_BUFFER_BIT               0x00004000
+#define GL_FALSE                          0
+#define GL_TRUE                           1
+#define GL_TRIANGLES                      0x0004
+#define GL_ONE                            1
+#define GL_SRC_ALPHA                      0x0302
+#define GL_ONE_MINUS_SRC_ALPHA            0x0303
+#define GL_FRONT                          0x0404
+#define GL_BACK                           0x0405
+#define GL_FRONT_AND_BACK                 0x0408
+#define GL_POLYGON_MODE                   0x0B40
+#define GL_CULL_FACE                      0x0B44
+#define GL_DEPTH_TEST                     0x0B71
+#define GL_STENCIL_TEST                   0x0B90
+#define GL_VIEWPORT                       0x0BA2
+#define GL_BLEND                          0x0BE2
+#define GL_SCISSOR_BOX                    0x0C10
+#define GL_SCISSOR_TEST                   0x0C11
+#define GL_UNPACK_ROW_LENGTH              0x0CF2
+#define GL_UNPACK_ALIGNMENT               0x0CF5
+#define GL_PACK_ALIGNMENT                 0x0D05
+#define GL_MAX_TEXTURE_SIZE               0x0D33
+#define GL_TEXTURE_2D                     0x0DE1
+#define GL_UNSIGNED_BYTE                  0x1401
+#define GL_UNSIGNED_SHORT                 0x1403
+#define GL_UNSIGNED_INT                   0x1405
+#define GL_FLOAT                          0x1406
+#define GL_RGBA                           0x1908
+#define GL_FILL                           0x1B02
+#define GL_VENDOR                         0x1F00
+#define GL_RENDERER                       0x1F01
+#define GL_VERSION                        0x1F02
+#define GL_EXTENSIONS                     0x1F03
+#define GL_NEAREST                        0x2600
+#define GL_LINEAR                         0x2601
+#define GL_TEXTURE_MAG_FILTER             0x2800
+#define GL_TEXTURE_MIN_FILTER             0x2801
+#define GL_TEXTURE_WRAP_S                 0x2802
+#define GL_TEXTURE_WRAP_T                 0x2803
+#define GL_REPEAT                         0x2901
+typedef void (APIENTRYP PFNGLPOLYGONMODEPROC) (GLenum face, GLenum mode);
+typedef void (APIENTRYP PFNGLSCISSORPROC) (GLint x, GLint y, GLsizei width, GLsizei height);
+typedef void (APIENTRYP PFNGLTEXPARAMETERIPROC) (GLenum target, GLenum pname, GLint param);
+typedef void (APIENTRYP PFNGLTEXIMAGE2DPROC) (GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels);
+typedef void (APIENTRYP PFNGLCLEARPROC) (GLbitfield mask);
+typedef void (APIENTRYP PFNGLCLEARCOLORPROC) (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+typedef void (APIENTRYP PFNGLDISABLEPROC) (GLenum cap);
+typedef void (APIENTRYP PFNGLENABLEPROC) (GLenum cap);
+typedef void (APIENTRYP PFNGLFLUSHPROC) (void);
+typedef void (APIENTRYP PFNGLPIXELSTOREIPROC) (GLenum pname, GLint param);
+typedef void (APIENTRYP PFNGLREADPIXELSPROC) (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels);
+typedef GLenum (APIENTRYP PFNGLGETERRORPROC) (void);
+typedef void (APIENTRYP PFNGLGETINTEGERVPROC) (GLenum pname, GLint *data);
+typedef const GLubyte *(APIENTRYP PFNGLGETSTRINGPROC) (GLenum name);
+typedef GLboolean (APIENTRYP PFNGLISENABLEDPROC) (GLenum cap);
+typedef void (APIENTRYP PFNGLVIEWPORTPROC) (GLint x, GLint y, GLsizei width, GLsizei height);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glPolygonMode (GLenum face, GLenum mode);
+GLAPI void APIENTRY glScissor (GLint x, GLint y, GLsizei width, GLsizei height);
+GLAPI void APIENTRY glTexParameteri (GLenum target, GLenum pname, GLint param);
+GLAPI void APIENTRY glTexImage2D (GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels);
+GLAPI void APIENTRY glClear (GLbitfield mask);
+GLAPI void APIENTRY glClearColor (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+GLAPI void APIENTRY glDisable (GLenum cap);
+GLAPI void APIENTRY glEnable (GLenum cap);
+GLAPI void APIENTRY glFlush (void);
+GLAPI void APIENTRY glPixelStorei (GLenum pname, GLint param);
+GLAPI void APIENTRY glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels);
+GLAPI GLenum APIENTRY glGetError (void);
+GLAPI void APIENTRY glGetIntegerv (GLenum pname, GLint *data);
+GLAPI const GLubyte *APIENTRY glGetString (GLenum name);
+GLAPI GLboolean APIENTRY glIsEnabled (GLenum cap);
+GLAPI void APIENTRY glViewport (GLint x, GLint y, GLsizei width, GLsizei height);
+#endif
+#endif /* GL_VERSION_1_0 */
+#ifndef GL_VERSION_1_1
+typedef khronos_float_t GLclampf;
+typedef double GLclampd;
+#define GL_TEXTURE_BINDING_2D             0x8069
+typedef void (APIENTRYP PFNGLDRAWELEMENTSPROC) (GLenum mode, GLsizei count, GLenum type, const void *indices);
+typedef void (APIENTRYP PFNGLTEXSUBIMAGE2DPROC) (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const void *pixels);
+typedef void (APIENTRYP PFNGLBINDTEXTUREPROC) (GLenum target, GLuint texture);
+typedef void (APIENTRYP PFNGLDELETETEXTURESPROC) (GLsizei n, const GLuint *textures);
+typedef void (APIENTRYP PFNGLGENTEXTURESPROC) (GLsizei n, GLuint *textures);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glDrawElements (GLenum mode, GLsizei count, GLenum type, const void *indices);
+GLAPI void APIENTRY glTexSubImage2D (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const void *pixels);
+GLAPI void APIENTRY glBindTexture (GLenum target, GLuint texture);
+GLAPI void APIENTRY glDeleteTextures (GLsizei n, const GLuint *textures);
+GLAPI void APIENTRY glGenTextures (GLsizei n, GLuint *textures);
+#endif
+#endif /* GL_VERSION_1_1 */
+#ifndef GL_VERSION_1_2
+#define GL_CLAMP_TO_EDGE                  0x812F
+#endif /* GL_VERSION_1_2 */
+#ifndef GL_VERSION_1_3
+#define GL_TEXTURE0                       0x84C0
+#define GL_ACTIVE_TEXTURE                 0x84E0
+typedef void (APIENTRYP PFNGLACTIVETEXTUREPROC) (GLenum texture);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glActiveTexture (GLenum texture);
+#endif
+#endif /* GL_VERSION_1_3 */
+#ifndef GL_VERSION_1_4
+#define GL_BLEND_DST_RGB                  0x80C8
+#define GL_BLEND_SRC_RGB                  0x80C9
+#define GL_BLEND_DST_ALPHA                0x80CA
+#define GL_BLEND_SRC_ALPHA                0x80CB
+#define GL_FUNC_ADD                       0x8006
+typedef void (APIENTRYP PFNGLBLENDFUNCSEPARATEPROC) (GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha);
+typedef void (APIENTRYP PFNGLBLENDEQUATIONPROC) (GLenum mode);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBlendFuncSeparate (GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha);
+GLAPI void APIENTRY glBlendEquation (GLenum mode);
+#endif
+#endif /* GL_VERSION_1_4 */
+#ifndef GL_VERSION_1_5
+typedef khronos_ssize_t GLsizeiptr;
+typedef khronos_intptr_t GLintptr;
+#define GL_ARRAY_BUFFER                   0x8892
+#define GL_ELEMENT_ARRAY_BUFFER           0x8893
+#define GL_ARRAY_BUFFER_BINDING           0x8894
+#define GL_ELEMENT_ARRAY_BUFFER_BINDING   0x8895
+#define GL_STREAM_DRAW                    0x88E0
+typedef void (APIENTRYP PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRYP PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
+typedef void (APIENTRYP PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRYP PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
+typedef void (APIENTRYP PFNGLBUFFERSUBDATAPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBindBuffer (GLenum target, GLuint buffer);
+GLAPI void APIENTRY glDeleteBuffers (GLsizei n, const GLuint *buffers);
+GLAPI void APIENTRY glGenBuffers (GLsizei n, GLuint *buffers);
+GLAPI void APIENTRY glBufferData (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
+GLAPI void APIENTRY glBufferSubData (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
+#endif
+#endif /* GL_VERSION_1_5 */
+#ifndef GL_VERSION_2_0
+typedef char GLchar;
+typedef khronos_int16_t GLshort;
+typedef khronos_int8_t GLbyte;
+typedef khronos_uint16_t GLushort;
+#define GL_BLEND_EQUATION_RGB             0x8009
+#define GL_VERTEX_ATTRIB_ARRAY_ENABLED    0x8622
+#define GL_VERTEX_ATTRIB_ARRAY_SIZE       0x8623
+#define GL_VERTEX_ATTRIB_ARRAY_STRIDE     0x8624
+#define GL_VERTEX_ATTRIB_ARRAY_TYPE       0x8625
+#define GL_VERTEX_ATTRIB_ARRAY_POINTER    0x8645
+#define GL_BLEND_EQUATION_ALPHA           0x883D
+#define GL_VERTEX_ATTRIB_ARRAY_NORMALIZED 0x886A
+#define GL_FRAGMENT_SHADER                0x8B30
+#define GL_VERTEX_SHADER                  0x8B31
+#define GL_COMPILE_STATUS                 0x8B81
+#define GL_LINK_STATUS                    0x8B82
+#define GL_INFO_LOG_LENGTH                0x8B84
+#define GL_CURRENT_PROGRAM                0x8B8D
+#define GL_UPPER_LEFT                     0x8CA2
+typedef void (APIENTRYP PFNGLBLENDEQUATIONSEPARATEPROC) (GLenum modeRGB, GLenum modeAlpha);
+typedef void (APIENTRYP PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);
+typedef void (APIENTRYP PFNGLCOMPILESHADERPROC) (GLuint shader);
+typedef GLuint (APIENTRYP PFNGLCREATEPROGRAMPROC) (void);
+typedef GLuint (APIENTRYP PFNGLCREATESHADERPROC) (GLenum type);
+typedef void (APIENTRYP PFNGLDELETEPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLDELETESHADERPROC) (GLuint shader);
+typedef void (APIENTRYP PFNGLDETACHSHADERPROC) (GLuint program, GLuint shader);
+typedef void (APIENTRYP PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef void (APIENTRYP PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef GLint (APIENTRYP PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const GLchar *name);
+typedef void (APIENTRYP PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+typedef void (APIENTRYP PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+typedef GLint (APIENTRYP PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const GLchar *name);
+typedef void (APIENTRYP PFNGLGETVERTEXATTRIBIVPROC) (GLuint index, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETVERTEXATTRIBPOINTERVPROC) (GLuint index, GLenum pname, void **pointer);
+typedef GLboolean (APIENTRYP PFNGLISPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLLINKPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length);
+typedef void (APIENTRYP PFNGLUSEPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLUNIFORM1IPROC) (GLint location, GLint v0);
+typedef void (APIENTRYP PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+typedef void (APIENTRYP PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBlendEquationSeparate (GLenum modeRGB, GLenum modeAlpha);
+GLAPI void APIENTRY glAttachShader (GLuint program, GLuint shader);
+GLAPI void APIENTRY glCompileShader (GLuint shader);
+GLAPI GLuint APIENTRY glCreateProgram (void);
+GLAPI GLuint APIENTRY glCreateShader (GLenum type);
+GLAPI void APIENTRY glDeleteProgram (GLuint program);
+GLAPI void APIENTRY glDeleteShader (GLuint shader);
+GLAPI void APIENTRY glDetachShader (GLuint program, GLuint shader);
+GLAPI void APIENTRY glDisableVertexAttribArray (GLuint index);
+GLAPI void APIENTRY glEnableVertexAttribArray (GLuint index);
+GLAPI GLint APIENTRY glGetAttribLocation (GLuint program, const GLchar *name);
+GLAPI void APIENTRY glGetProgramiv (GLuint program, GLenum pname, GLint *params);
+GLAPI void APIENTRY glGetProgramInfoLog (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+GLAPI void APIENTRY glGetShaderiv (GLuint shader, GLenum pname, GLint *params);
+GLAPI void APIENTRY glGetShaderInfoLog (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+GLAPI GLint APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
+GLAPI void APIENTRY glGetVertexAttribiv (GLuint index, GLenum pname, GLint *params);
+GLAPI void APIENTRY glGetVertexAttribPointerv (GLuint index, GLenum pname, void **pointer);
+GLAPI GLboolean APIENTRY glIsProgram (GLuint program);
+GLAPI void APIENTRY glLinkProgram (GLuint program);
+GLAPI void APIENTRY glShaderSource (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length);
+GLAPI void APIENTRY glUseProgram (GLuint program);
+GLAPI void APIENTRY glUniform1i (GLint location, GLint v0);
+GLAPI void APIENTRY glUniformMatrix4fv (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+GLAPI void APIENTRY glVertexAttribPointer (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer);
+#endif
+#endif /* GL_VERSION_2_0 */
+#ifndef GL_VERSION_2_1
+#define GL_PIXEL_UNPACK_BUFFER            0x88EC
+#define GL_PIXEL_UNPACK_BUFFER_BINDING    0x88EF
+#endif /* GL_VERSION_2_1 */
+#ifndef GL_VERSION_3_0
+typedef khronos_uint16_t GLhalf;
+#define GL_MAJOR_VERSION                  0x821B
+#define GL_MINOR_VERSION                  0x821C
+#define GL_NUM_EXTENSIONS                 0x821D
+#define GL_FRAMEBUFFER_SRGB               0x8DB9
+#define GL_VERTEX_ARRAY_BINDING           0x85B5
+typedef void (APIENTRYP PFNGLGETBOOLEANI_VPROC) (GLenum target, GLuint index, GLboolean *data);
+typedef void (APIENTRYP PFNGLGETINTEGERI_VPROC) (GLenum target, GLuint index, GLint *data);
+typedef const GLubyte *(APIENTRYP PFNGLGETSTRINGIPROC) (GLenum name, GLuint index);
+typedef void (APIENTRYP PFNGLBINDVERTEXARRAYPROC) (GLuint array);
+typedef void (APIENTRYP PFNGLDELETEVERTEXARRAYSPROC) (GLsizei n, const GLuint *arrays);
+typedef void (APIENTRYP PFNGLGENVERTEXARRAYSPROC) (GLsizei n, GLuint *arrays);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI const GLubyte *APIENTRY glGetStringi (GLenum name, GLuint index);
+GLAPI void APIENTRY glBindVertexArray (GLuint array);
+GLAPI void APIENTRY glDeleteVertexArrays (GLsizei n, const GLuint *arrays);
+GLAPI void APIENTRY glGenVertexArrays (GLsizei n, GLuint *arrays);
+#endif
+#endif /* GL_VERSION_3_0 */
+#ifndef GL_VERSION_3_1
+#define GL_VERSION_3_1 1
+#define GL_PRIMITIVE_RESTART              0x8F9D
+#endif /* GL_VERSION_3_1 */
+#ifndef GL_VERSION_3_2
+#define GL_VERSION_3_2 1
+typedef struct __GLsync *GLsync;
+typedef khronos_uint64_t GLuint64;
+typedef khronos_int64_t GLint64;
+#define GL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002
+#define GL_CONTEXT_PROFILE_MASK           0x9126
+typedef void (APIENTRYP PFNGLDRAWELEMENTSBASEVERTEXPROC) (GLenum mode, GLsizei count, GLenum type, const void *indices, GLint basevertex);
+typedef void (APIENTRYP PFNGLGETINTEGER64I_VPROC) (GLenum target, GLuint index, GLint64 *data);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glDrawElementsBaseVertex (GLenum mode, GLsizei count, GLenum type, const void *indices, GLint basevertex);
+#endif
+#endif /* GL_VERSION_3_2 */
+#ifndef GL_VERSION_3_3
+#define GL_VERSION_3_3 1
+#define GL_SAMPLER_BINDING                0x8919
+typedef void (APIENTRYP PFNGLGENSAMPLERSPROC) (GLsizei count, GLuint *samplers);
+typedef void (APIENTRYP PFNGLDELETESAMPLERSPROC) (GLsizei count, const GLuint *samplers);
+typedef void (APIENTRYP PFNGLBINDSAMPLERPROC) (GLuint unit, GLuint sampler);
+typedef void (APIENTRYP PFNGLSAMPLERPARAMETERIPROC) (GLuint sampler, GLenum pname, GLint param);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glGenSamplers (GLsizei count, GLuint *samplers);
+GLAPI void APIENTRY glDeleteSamplers (GLsizei count, const GLuint *samplers);
+GLAPI void APIENTRY glBindSampler (GLuint unit, GLuint sampler);
+GLAPI void APIENTRY glSamplerParameteri (GLuint sampler, GLenum pname, GLint param);
+#endif
+#endif /* GL_VERSION_3_3 */
+#ifndef GL_VERSION_4_1
+typedef void (APIENTRYP PFNGLGETFLOATI_VPROC) (GLenum target, GLuint index, GLfloat *data);
+typedef void (APIENTRYP PFNGLGETDOUBLEI_VPROC) (GLenum target, GLuint index, GLdouble *data);
+#endif /* GL_VERSION_4_1 */
+#ifndef GL_VERSION_4_3
+typedef void (APIENTRY  *GLDEBUGPROC)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam);
+#endif /* GL_VERSION_4_3 */
+#ifndef GL_VERSION_4_5
+#define GL_CLIP_ORIGIN                    0x935C
+typedef void (APIENTRYP PFNGLGETTRANSFORMFEEDBACKI_VPROC) (GLuint xfb, GLenum pname, GLuint index, GLint *param);
+typedef void (APIENTRYP PFNGLGETTRANSFORMFEEDBACKI64_VPROC) (GLuint xfb, GLenum pname, GLuint index, GLint64 *param);
+#endif /* GL_VERSION_4_5 */
+#ifndef GL_ARB_bindless_texture
+typedef khronos_uint64_t GLuint64EXT;
+#endif /* GL_ARB_bindless_texture */
+#ifndef GL_ARB_cl_event
+struct _cl_context;
+struct _cl_event;
+#endif /* GL_ARB_cl_event */
+#ifndef GL_ARB_clip_control
+#define GL_ARB_clip_control 1
+#endif /* GL_ARB_clip_control */
+#ifndef GL_ARB_debug_output
+typedef void (APIENTRY  *GLDEBUGPROCARB)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam);
+#endif /* GL_ARB_debug_output */
+#ifndef GL_EXT_EGL_image_storage
+typedef void *GLeglImageOES;
+#endif /* GL_EXT_EGL_image_storage */
+#ifndef GL_EXT_direct_state_access
+typedef void (APIENTRYP PFNGLGETFLOATI_VEXTPROC) (GLenum pname, GLuint index, GLfloat *params);
+typedef void (APIENTRYP PFNGLGETDOUBLEI_VEXTPROC) (GLenum pname, GLuint index, GLdouble *params);
+typedef void (APIENTRYP PFNGLGETPOINTERI_VEXTPROC) (GLenum pname, GLuint index, void **params);
+typedef void (APIENTRYP PFNGLGETVERTEXARRAYINTEGERI_VEXTPROC) (GLuint vaobj, GLuint index, GLenum pname, GLint *param);
+typedef void (APIENTRYP PFNGLGETVERTEXARRAYPOINTERI_VEXTPROC) (GLuint vaobj, GLuint index, GLenum pname, void **param);
+#endif /* GL_EXT_direct_state_access */
+#ifndef GL_NV_draw_vulkan_image
+typedef void (APIENTRY  *GLVULKANPROCNV)(void);
+#endif /* GL_NV_draw_vulkan_image */
+#ifndef GL_NV_gpu_shader5
+typedef khronos_int64_t GLint64EXT;
+#endif /* GL_NV_gpu_shader5 */
+#ifndef GL_NV_vertex_buffer_unified_memory
+typedef void (APIENTRYP PFNGLGETINTEGERUI64I_VNVPROC) (GLenum value, GLuint index, GLuint64EXT *result);
+#endif /* GL_NV_vertex_buffer_unified_memory */
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#ifndef GL3W_API
+#define GL3W_API
+#endif
+
+#ifndef __gl_h_
+#define __gl_h_
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define GL3W_OK 0
+#define GL3W_ERROR_INIT -1
+#define GL3W_ERROR_LIBRARY_OPEN -2
+#define GL3W_ERROR_OPENGL_VERSION -3
+
+typedef void (*GL3WglProc)(void);
+typedef GL3WglProc (*GL3WGetProcAddressProc)(const char *proc);
+
+/* gl3w api */
+GL3W_API int imgl3wInit(void);
+GL3W_API int imgl3wInit2(GL3WGetProcAddressProc proc);
+GL3W_API void imgl3wShutdown(void);
+GL3W_API int imgl3wIsSupported(int major, int minor);
+GL3W_API GL3WglProc imgl3wGetProcAddress(const char *proc);
+
+/* gl3w internal state */
+union ImGL3WProcs {
+    GL3WglProc ptr[63];
+    struct {
+        PFNGLACTIVETEXTUREPROC            ActiveTexture;
+        PFNGLATTACHSHADERPROC             AttachShader;
+        PFNGLBINDBUFFERPROC               BindBuffer;
+        PFNGLBINDSAMPLERPROC              BindSampler;
+        PFNGLBINDTEXTUREPROC              BindTexture;
+        PFNGLBINDVERTEXARRAYPROC          BindVertexArray;
+        PFNGLBLENDEQUATIONPROC            BlendEquation;
+        PFNGLBLENDEQUATIONSEPARATEPROC    BlendEquationSeparate;
+        PFNGLBLENDFUNCSEPARATEPROC        BlendFuncSeparate;
+        PFNGLBUFFERDATAPROC               BufferData;
+        PFNGLBUFFERSUBDATAPROC            BufferSubData;
+        PFNGLCLEARPROC                    Clear;
+        PFNGLCLEARCOLORPROC               ClearColor;
+        PFNGLCOMPILESHADERPROC            CompileShader;
+        PFNGLCREATEPROGRAMPROC            CreateProgram;
+        PFNGLCREATESHADERPROC             CreateShader;
+        PFNGLDELETEBUFFERSPROC            DeleteBuffers;
+        PFNGLDELETEPROGRAMPROC            DeleteProgram;
+        PFNGLDELETESAMPLERSPROC           DeleteSamplers;
+        PFNGLDELETESHADERPROC             DeleteShader;
+        PFNGLDELETETEXTURESPROC           DeleteTextures;
+        PFNGLDELETEVERTEXARRAYSPROC       DeleteVertexArrays;
+        PFNGLDETACHSHADERPROC             DetachShader;
+        PFNGLDISABLEPROC                  Disable;
+        PFNGLDISABLEVERTEXATTRIBARRAYPROC DisableVertexAttribArray;
+        PFNGLDRAWELEMENTSPROC             DrawElements;
+        PFNGLDRAWELEMENTSBASEVERTEXPROC   DrawElementsBaseVertex;
+        PFNGLENABLEPROC                   Enable;
+        PFNGLENABLEVERTEXATTRIBARRAYPROC  EnableVertexAttribArray;
+        PFNGLFLUSHPROC                    Flush;
+        PFNGLGENBUFFERSPROC               GenBuffers;
+        PFNGLGENSAMPLERSPROC              GenSamplers;
+        PFNGLGENTEXTURESPROC              GenTextures;
+        PFNGLGENVERTEXARRAYSPROC          GenVertexArrays;
+        PFNGLGETATTRIBLOCATIONPROC        GetAttribLocation;
+        PFNGLGETERRORPROC                 GetError;
+        PFNGLGETINTEGERVPROC              GetIntegerv;
+        PFNGLGETPROGRAMINFOLOGPROC        GetProgramInfoLog;
+        PFNGLGETPROGRAMIVPROC             GetProgramiv;
+        PFNGLGETSHADERINFOLOGPROC         GetShaderInfoLog;
+        PFNGLGETSHADERIVPROC              GetShaderiv;
+        PFNGLGETSTRINGPROC                GetString;
+        PFNGLGETSTRINGIPROC               GetStringi;
+        PFNGLGETUNIFORMLOCATIONPROC       GetUniformLocation;
+        PFNGLGETVERTEXATTRIBPOINTERVPROC  GetVertexAttribPointerv;
+        PFNGLGETVERTEXATTRIBIVPROC        GetVertexAttribiv;
+        PFNGLISENABLEDPROC                IsEnabled;
+        PFNGLISPROGRAMPROC                IsProgram;
+        PFNGLLINKPROGRAMPROC              LinkProgram;
+        PFNGLPIXELSTOREIPROC              PixelStorei;
+        PFNGLPOLYGONMODEPROC              PolygonMode;
+        PFNGLREADPIXELSPROC               ReadPixels;
+        PFNGLSAMPLERPARAMETERIPROC        SamplerParameteri;
+        PFNGLSCISSORPROC                  Scissor;
+        PFNGLSHADERSOURCEPROC             ShaderSource;
+        PFNGLTEXIMAGE2DPROC               TexImage2D;
+        PFNGLTEXPARAMETERIPROC            TexParameteri;
+        PFNGLTEXSUBIMAGE2DPROC            TexSubImage2D;
+        PFNGLUNIFORM1IPROC                Uniform1i;
+        PFNGLUNIFORMMATRIX4FVPROC         UniformMatrix4fv;
+        PFNGLUSEPROGRAMPROC               UseProgram;
+        PFNGLVERTEXATTRIBPOINTERPROC      VertexAttribPointer;
+        PFNGLVIEWPORTPROC                 Viewport;
+    } gl;
+};
+
+GL3W_API extern union ImGL3WProcs imgl3wProcs;
+
+/* OpenGL functions */
+#define glActiveTexture                   imgl3wProcs.gl.ActiveTexture
+#define glAttachShader                    imgl3wProcs.gl.AttachShader
+#define glBindBuffer                      imgl3wProcs.gl.BindBuffer
+#define glBindSampler                     imgl3wProcs.gl.BindSampler
+#define glBindTexture                     imgl3wProcs.gl.BindTexture
+#define glBindVertexArray                 imgl3wProcs.gl.BindVertexArray
+#define glBlendEquation                   imgl3wProcs.gl.BlendEquation
+#define glBlendEquationSeparate           imgl3wProcs.gl.BlendEquationSeparate
+#define glBlendFuncSeparate               imgl3wProcs.gl.BlendFuncSeparate
+#define glBufferData                      imgl3wProcs.gl.BufferData
+#define glBufferSubData                   imgl3wProcs.gl.BufferSubData
+#define glClear                           imgl3wProcs.gl.Clear
+#define glClearColor                      imgl3wProcs.gl.ClearColor
+#define glCompileShader                   imgl3wProcs.gl.CompileShader
+#define glCreateProgram                   imgl3wProcs.gl.CreateProgram
+#define glCreateShader                    imgl3wProcs.gl.CreateShader
+#define glDeleteBuffers                   imgl3wProcs.gl.DeleteBuffers
+#define glDeleteProgram                   imgl3wProcs.gl.DeleteProgram
+#define glDeleteSamplers                  imgl3wProcs.gl.DeleteSamplers
+#define glDeleteShader                    imgl3wProcs.gl.DeleteShader
+#define glDeleteTextures                  imgl3wProcs.gl.DeleteTextures
+#define glDeleteVertexArrays              imgl3wProcs.gl.DeleteVertexArrays
+#define glDetachShader                    imgl3wProcs.gl.DetachShader
+#define glDisable                         imgl3wProcs.gl.Disable
+#define glDisableVertexAttribArray        imgl3wProcs.gl.DisableVertexAttribArray
+#define glDrawElements                    imgl3wProcs.gl.DrawElements
+#define glDrawElementsBaseVertex          imgl3wProcs.gl.DrawElementsBaseVertex
+#define glEnable                          imgl3wProcs.gl.Enable
+#define glEnableVertexAttribArray         imgl3wProcs.gl.EnableVertexAttribArray
+#define glFlush                           imgl3wProcs.gl.Flush
+#define glGenBuffers                      imgl3wProcs.gl.GenBuffers
+#define glGenSamplers                     imgl3wProcs.gl.GenSamplers
+#define glGenTextures                     imgl3wProcs.gl.GenTextures
+#define glGenVertexArrays                 imgl3wProcs.gl.GenVertexArrays
+#define glGetAttribLocation               imgl3wProcs.gl.GetAttribLocation
+#define glGetError                        imgl3wProcs.gl.GetError
+#define glGetIntegerv                     imgl3wProcs.gl.GetIntegerv
+#define glGetProgramInfoLog               imgl3wProcs.gl.GetProgramInfoLog
+#define glGetProgramiv                    imgl3wProcs.gl.GetProgramiv
+#define glGetShaderInfoLog                imgl3wProcs.gl.GetShaderInfoLog
+#define glGetShaderiv                     imgl3wProcs.gl.GetShaderiv
+#define glGetString                       imgl3wProcs.gl.GetString
+#define glGetStringi                      imgl3wProcs.gl.GetStringi
+#define glGetUniformLocation              imgl3wProcs.gl.GetUniformLocation
+#define glGetVertexAttribPointerv         imgl3wProcs.gl.GetVertexAttribPointerv
+#define glGetVertexAttribiv               imgl3wProcs.gl.GetVertexAttribiv
+#define glIsEnabled                       imgl3wProcs.gl.IsEnabled
+#define glIsProgram                       imgl3wProcs.gl.IsProgram
+#define glLinkProgram                     imgl3wProcs.gl.LinkProgram
+#define glPixelStorei                     imgl3wProcs.gl.PixelStorei
+#define glPolygonMode                     imgl3wProcs.gl.PolygonMode
+#define glReadPixels                      imgl3wProcs.gl.ReadPixels
+#define glSamplerParameteri               imgl3wProcs.gl.SamplerParameteri
+#define glScissor                         imgl3wProcs.gl.Scissor
+#define glShaderSource                    imgl3wProcs.gl.ShaderSource
+#define glTexImage2D                      imgl3wProcs.gl.TexImage2D
+#define glTexParameteri                   imgl3wProcs.gl.TexParameteri
+#define glTexSubImage2D                   imgl3wProcs.gl.TexSubImage2D
+#define glUniform1i                       imgl3wProcs.gl.Uniform1i
+#define glUniformMatrix4fv                imgl3wProcs.gl.UniformMatrix4fv
+#define glUseProgram                      imgl3wProcs.gl.UseProgram
+#define glVertexAttribPointer             imgl3wProcs.gl.VertexAttribPointer
+#define glViewport                        imgl3wProcs.gl.Viewport
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#ifdef IMGL3W_IMPL
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#define GL3W_ARRAY_SIZE(x)  (sizeof(x) / sizeof((x)[0]))
+
+#if defined(_WIN32)
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN 1
+#endif
+#include <windows.h>
+
+static HMODULE libgl = NULL;
+typedef PROC(__stdcall* GL3WglGetProcAddr)(LPCSTR);
+static GL3WglGetProcAddr wgl_get_proc_address;
+
+static int open_libgl(void)
+{
+    libgl = LoadLibraryA("opengl32.dll");
+    if (!libgl)
+        return GL3W_ERROR_LIBRARY_OPEN;
+    wgl_get_proc_address = (GL3WglGetProcAddr)GetProcAddress(libgl, "wglGetProcAddress");
+    return GL3W_OK;
+}
+
+static void close_libgl(void) { FreeLibrary(libgl); libgl = NULL; }
+static GL3WglProc get_proc(const char *proc)
+{
+    GL3WglProc res;
+    res = (GL3WglProc)wgl_get_proc_address(proc);
+    if (!res)
+        res = (GL3WglProc)GetProcAddress(libgl, proc);
+    return res;
+}
+#elif defined(__APPLE__)
+#include <dlfcn.h>
+
+static void *libgl = NULL;
+static int open_libgl(void)
+{
+    libgl = dlopen("/System/Library/Frameworks/OpenGL.framework/OpenGL", RTLD_LAZY | RTLD_LOCAL);
+    if (!libgl)
+        return GL3W_ERROR_LIBRARY_OPEN;
+    return GL3W_OK;
+}
+
+static void close_libgl(void) { dlclose(libgl); libgl = NULL; }
+
+static GL3WglProc get_proc(const char *proc)
+{
+    GL3WglProc res;
+    *(void **)(&res) = dlsym(libgl, proc);
+    return res;
+}
+#else
+#include <dlfcn.h>
+
+static void* libgl;  // OpenGL library
+static void* libglx;  // GLX library
+static void* libegl;  // EGL library
+static GL3WGetProcAddressProc gl_get_proc_address;
+
+static void close_libgl(void)
+{
+    if (libgl) {
+        dlclose(libgl);
+        libgl = NULL;
+    }
+    if (libegl) {
+        dlclose(libegl);
+        libegl = NULL;
+    }
+    if (libglx) {
+        dlclose(libglx);
+        libglx = NULL;
+    }
+}
+
+static int is_library_loaded(const char* name, void** lib)
+{
+#if defined(__HAIKU__)
+    *lib = NULL; // no support for RTLD_NOLOAD on Haiku.
+#else
+    *lib = dlopen(name, RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
+#endif
+    return *lib != NULL;
+}
+
+static int open_libs(void)
+{
+    // On Linux we have two APIs to get process addresses: EGL and GLX.
+    // EGL is supported under both X11 and Wayland, whereas GLX is X11-specific.
+
+    libgl = NULL;
+    libegl = NULL;
+    libglx = NULL;
+
+    // First check what's already loaded, the windowing library might have
+    // already loaded either EGL or GLX and we want to use the same one.
+
+    if (is_library_loaded("libEGL.so.1", &libegl) ||
+        is_library_loaded("libGLX.so.0", &libglx)) {
+        libgl = dlopen("libOpenGL.so.0", RTLD_LAZY | RTLD_LOCAL);
+        if (libgl)
+            return GL3W_OK;
+        else
+            close_libgl();
+    }
+
+    if (is_library_loaded("libGL.so", &libgl))
+        return GL3W_OK;
+    if (is_library_loaded("libGL.so.1", &libgl))
+        return GL3W_OK;
+    if (is_library_loaded("libGL.so.3", &libgl))
+        return GL3W_OK;
+
+    // Neither is already loaded, so we have to load one.  Try EGL first
+    // because it is supported under both X11 and Wayland.
+
+    // Load OpenGL + EGL
+    libgl = dlopen("libOpenGL.so.0", RTLD_LAZY | RTLD_LOCAL);
+    libegl = dlopen("libEGL.so.1", RTLD_LAZY | RTLD_LOCAL);
+    if (libgl && libegl)
+        return GL3W_OK;
+    else
+        close_libgl();
+
+    // Fall back to legacy libGL, which includes GLX
+    // While most systems use libGL.so.1, NetBSD seems to use that libGL.so.3. See https://github.com/ocornut/imgui/issues/6983
+    libgl = dlopen("libGL.so", RTLD_LAZY | RTLD_LOCAL);
+    if (!libgl)
+        libgl = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL);
+    if (!libgl)
+        libgl = dlopen("libGL.so.3", RTLD_LAZY | RTLD_LOCAL);
+
+    if (libgl)
+        return GL3W_OK;
+
+    return GL3W_ERROR_LIBRARY_OPEN;
+}
+
+static int open_libgl(void)
+{
+    int res = open_libs();
+    if (res)
+        return res;
+
+    if (libegl)
+        *(void**)(&gl_get_proc_address) = dlsym(libegl, "eglGetProcAddress");
+    else if (libglx)
+        *(void**)(&gl_get_proc_address) = dlsym(libglx, "glXGetProcAddressARB");
+    else
+        *(void**)(&gl_get_proc_address) = dlsym(libgl, "glXGetProcAddressARB");
+
+    if (!gl_get_proc_address) {
+        close_libgl();
+        return GL3W_ERROR_LIBRARY_OPEN;
+    }
+
+    return GL3W_OK;
+}
+
+static GL3WglProc get_proc(const char* proc)
+{
+    GL3WglProc res = NULL;
+
+    // Before EGL version 1.5, eglGetProcAddress doesn't support querying core
+    // functions and may return a dummy function if we try, so try to load the
+    // function from the GL library directly first.
+    if (libegl)
+        *(void**)(&res) = dlsym(libgl, proc);
+
+    if (!res)
+        res = gl_get_proc_address(proc);
+
+    if (!libegl && !res)
+        *(void**)(&res) = dlsym(libgl, proc);
+
+    return res;
+}
+#endif
+
+static struct { int major, minor; } version;
+
+static int parse_version(void)
+{
+    if (!glGetIntegerv)
+        return GL3W_ERROR_INIT;
+    glGetIntegerv(GL_MAJOR_VERSION, &version.major);
+    glGetIntegerv(GL_MINOR_VERSION, &version.minor);
+    if (version.major == 0 && version.minor == 0)
+    {
+        // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
+        if (const char* gl_version = (const char*)glGetString(GL_VERSION))
+            sscanf(gl_version, "%d.%d", &version.major, &version.minor);
+    }
+    if (version.major < 2)
+        return GL3W_ERROR_OPENGL_VERSION;
+    return GL3W_OK;
+}
+
+static void load_procs(GL3WGetProcAddressProc proc);
+static void clear_procs();
+
+int imgl3wInit(void)
+{
+    int res = open_libgl();
+    if (res)
+        return res;
+    atexit(close_libgl);
+    return imgl3wInit2(get_proc);
+}
+
+int imgl3wInit2(GL3WGetProcAddressProc proc)
+{
+    load_procs(proc);
+    return parse_version();
+}
+
+void imgl3wShutdown(void)
+{
+    close_libgl();
+    clear_procs();
+}
+
+int imgl3wIsSupported(int major, int minor)
+{
+    if (major < 2)
+        return 0;
+    if (version.major == major)
+        return version.minor >= minor;
+    return version.major >= major;
+}
+
+GL3WglProc imgl3wGetProcAddress(const char *proc) { return get_proc(proc); }
+
+static const char *proc_names[] = {
+    "glActiveTexture",
+    "glAttachShader",
+    "glBindBuffer",
+    "glBindSampler",
+    "glBindTexture",
+    "glBindVertexArray",
+    "glBlendEquation",
+    "glBlendEquationSeparate",
+    "glBlendFuncSeparate",
+    "glBufferData",
+    "glBufferSubData",
+    "glClear",
+    "glClearColor",
+    "glCompileShader",
+    "glCreateProgram",
+    "glCreateShader",
+    "glDeleteBuffers",
+    "glDeleteProgram",
+    "glDeleteSamplers",
+    "glDeleteShader",
+    "glDeleteTextures",
+    "glDeleteVertexArrays",
+    "glDetachShader",
+    "glDisable",
+    "glDisableVertexAttribArray",
+    "glDrawElements",
+    "glDrawElementsBaseVertex",
+    "glEnable",
+    "glEnableVertexAttribArray",
+    "glFlush",
+    "glGenBuffers",
+    "glGenSamplers",
+    "glGenTextures",
+    "glGenVertexArrays",
+    "glGetAttribLocation",
+    "glGetError",
+    "glGetIntegerv",
+    "glGetProgramInfoLog",
+    "glGetProgramiv",
+    "glGetShaderInfoLog",
+    "glGetShaderiv",
+    "glGetString",
+    "glGetStringi",
+    "glGetUniformLocation",
+    "glGetVertexAttribPointerv",
+    "glGetVertexAttribiv",
+    "glIsEnabled",
+    "glIsProgram",
+    "glLinkProgram",
+    "glPixelStorei",
+    "glPolygonMode",
+    "glReadPixels",
+    "glSamplerParameteri",
+    "glScissor",
+    "glShaderSource",
+    "glTexImage2D",
+    "glTexParameteri",
+    "glTexSubImage2D",
+    "glUniform1i",
+    "glUniformMatrix4fv",
+    "glUseProgram",
+    "glVertexAttribPointer",
+    "glViewport",
+};
+
+GL3W_API union ImGL3WProcs imgl3wProcs;
+
+static void load_procs(GL3WGetProcAddressProc proc)
+{
+    size_t i;
+    for (i = 0; i < GL3W_ARRAY_SIZE(proc_names); i++)
+        imgl3wProcs.ptr[i] = proc(proc_names[i]);
+}
+
+static void clear_procs()
+{
+    size_t i;
+    for (i = 0; i < GL3W_ARRAY_SIZE(proc_names); i++)
+        imgl3wProcs.ptr[i] = nullptr;
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif

src/imgui/imstb_rectpack.h

@@ -0,0 +1,627 @@
+// [DEAR IMGUI]
+// This is a slightly modified version of stb_rect_pack.h 1.01.
+// Grep for [DEAR IMGUI] to find the changes.
+// 
+// stb_rect_pack.h - v1.01 - public domain - rectangle packing
+// Sean Barrett 2014
+//
+// Useful for e.g. packing rectangular textures into an atlas.
+// Does not do rotation.
+//
+// Before #including,
+//
+//    #define STB_RECT_PACK_IMPLEMENTATION
+//
+// in the file that you want to have the implementation.
+//
+// Not necessarily the awesomest packing method, but better than
+// the totally naive one in stb_truetype (which is primarily what
+// this is meant to replace).
+//
+// Has only had a few tests run, may have issues.
+//
+// More docs to come.
+//
+// No memory allocations; uses qsort() and assert() from stdlib.
+// Can override those by defining STBRP_SORT and STBRP_ASSERT.
+//
+// This library currently uses the Skyline Bottom-Left algorithm.
+//
+// Please note: better rectangle packers are welcome! Please
+// implement them to the same API, but with a different init
+// function.
+//
+// Credits
+//
+//  Library
+//    Sean Barrett
+//  Minor features
+//    Martins Mozeiko
+//    github:IntellectualKitty
+//
+//  Bugfixes / warning fixes
+//    Jeremy Jaussaud
+//    Fabian Giesen
+//
+// Version history:
+//
+//     1.01  (2021-07-11)  always use large rect mode, expose STBRP__MAXVAL in public section
+//     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
+//     0.99  (2019-02-07)  warning fixes
+//     0.11  (2017-03-03)  return packing success/fail result
+//     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
+//     0.09  (2016-08-27)  fix compiler warnings
+//     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
+//     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
+//     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
+//     0.05:  added STBRP_ASSERT to allow replacing assert
+//     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
+//     0.01:  initial release
+//
+// LICENSE
+//
+//   See end of file for license information.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//       INCLUDE SECTION
+//
+
+#ifndef STB_INCLUDE_STB_RECT_PACK_H
+#define STB_INCLUDE_STB_RECT_PACK_H
+
+#define STB_RECT_PACK_VERSION  1
+
+#ifdef STBRP_STATIC
+#define STBRP_DEF static
+#else
+#define STBRP_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct stbrp_context stbrp_context;
+typedef struct stbrp_node    stbrp_node;
+typedef struct stbrp_rect    stbrp_rect;
+
+typedef int            stbrp_coord;
+
+#define STBRP__MAXVAL  0x7fffffff
+// Mostly for internal use, but this is the maximum supported coordinate value.
+
+STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
+// Assign packed locations to rectangles. The rectangles are of type
+// 'stbrp_rect' defined below, stored in the array 'rects', and there
+// are 'num_rects' many of them.
+//
+// Rectangles which are successfully packed have the 'was_packed' flag
+// set to a non-zero value and 'x' and 'y' store the minimum location
+// on each axis (i.e. bottom-left in cartesian coordinates, top-left
+// if you imagine y increasing downwards). Rectangles which do not fit
+// have the 'was_packed' flag set to 0.
+//
+// You should not try to access the 'rects' array from another thread
+// while this function is running, as the function temporarily reorders
+// the array while it executes.
+//
+// To pack into another rectangle, you need to call stbrp_init_target
+// again. To continue packing into the same rectangle, you can call
+// this function again. Calling this multiple times with multiple rect
+// arrays will probably produce worse packing results than calling it
+// a single time with the full rectangle array, but the option is
+// available.
+//
+// The function returns 1 if all of the rectangles were successfully
+// packed and 0 otherwise.
+
+struct stbrp_rect
+{
+   // reserved for your use:
+   int            id;
+
+   // input:
+   stbrp_coord    w, h;
+
+   // output:
+   stbrp_coord    x, y;
+   int            was_packed;  // non-zero if valid packing
+
+}; // 16 bytes, nominally
+
+
+STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
+// Initialize a rectangle packer to:
+//    pack a rectangle that is 'width' by 'height' in dimensions
+//    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
+//
+// You must call this function every time you start packing into a new target.
+//
+// There is no "shutdown" function. The 'nodes' memory must stay valid for
+// the following stbrp_pack_rects() call (or calls), but can be freed after
+// the call (or calls) finish.
+//
+// Note: to guarantee best results, either:
+//       1. make sure 'num_nodes' >= 'width'
+//   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
+//
+// If you don't do either of the above things, widths will be quantized to multiples
+// of small integers to guarantee the algorithm doesn't run out of temporary storage.
+//
+// If you do #2, then the non-quantized algorithm will be used, but the algorithm
+// may run out of temporary storage and be unable to pack some rectangles.
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
+// Optionally call this function after init but before doing any packing to
+// change the handling of the out-of-temp-memory scenario, described above.
+// If you call init again, this will be reset to the default (false).
+
+
+STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
+// Optionally select which packing heuristic the library should use. Different
+// heuristics will produce better/worse results for different data sets.
+// If you call init again, this will be reset to the default.
+
+enum
+{
+   STBRP_HEURISTIC_Skyline_default=0,
+   STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
+   STBRP_HEURISTIC_Skyline_BF_sortHeight
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// the details of the following structures don't matter to you, but they must
+// be visible so you can handle the memory allocations for them
+
+struct stbrp_node
+{
+   stbrp_coord  x,y;
+   stbrp_node  *next;
+};
+
+struct stbrp_context
+{
+   int width;
+   int height;
+   int align;
+   int init_mode;
+   int heuristic;
+   int num_nodes;
+   stbrp_node *active_head;
+   stbrp_node *free_head;
+   stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//     IMPLEMENTATION SECTION
+//
+
+#ifdef STB_RECT_PACK_IMPLEMENTATION
+#ifndef STBRP_SORT
+#include <stdlib.h>
+#define STBRP_SORT qsort
+#endif
+
+#ifndef STBRP_ASSERT
+#include <assert.h>
+#define STBRP_ASSERT assert
+#endif
+
+#ifdef _MSC_VER
+#define STBRP__NOTUSED(v)  (void)(v)
+#define STBRP__CDECL       __cdecl
+#else
+#define STBRP__NOTUSED(v)  (void)sizeof(v)
+#define STBRP__CDECL
+#endif
+
+enum
+{
+   STBRP__INIT_skyline = 1
+};
+
+STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
+{
+   switch (context->init_mode) {
+      case STBRP__INIT_skyline:
+         STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
+         context->heuristic = heuristic;
+         break;
+      default:
+         STBRP_ASSERT(0);
+   }
+}
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
+{
+   if (allow_out_of_mem)
+      // if it's ok to run out of memory, then don't bother aligning them;
+      // this gives better packing, but may fail due to OOM (even though
+      // the rectangles easily fit). @TODO a smarter approach would be to only
+      // quantize once we've hit OOM, then we could get rid of this parameter.
+      context->align = 1;
+   else {
+      // if it's not ok to run out of memory, then quantize the widths
+      // so that num_nodes is always enough nodes.
+      //
+      // I.e. num_nodes * align >= width
+      //                  align >= width / num_nodes
+      //                  align = ceil(width/num_nodes)
+
+      context->align = (context->width + context->num_nodes-1) / context->num_nodes;
+   }
+}
+
+STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
+{
+   int i;
+
+   for (i=0; i < num_nodes-1; ++i)
+      nodes[i].next = &nodes[i+1];
+   nodes[i].next = NULL;
+   context->init_mode = STBRP__INIT_skyline;
+   context->heuristic = STBRP_HEURISTIC_Skyline_default;
+   context->free_head = &nodes[0];
+   context->active_head = &context->extra[0];
+   context->width = width;
+   context->height = height;
+   context->num_nodes = num_nodes;
+   stbrp_setup_allow_out_of_mem(context, 0);
+
+   // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
+   context->extra[0].x = 0;
+   context->extra[0].y = 0;
+   context->extra[0].next = &context->extra[1];
+   context->extra[1].x = (stbrp_coord) width;
+   context->extra[1].y = (1<<30);
+   context->extra[1].next = NULL;
+}
+
+// find minimum y position if it starts at x1
+static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
+{
+   stbrp_node *node = first;
+   int x1 = x0 + width;
+   int min_y, visited_width, waste_area;
+
+   STBRP__NOTUSED(c);
+
+   STBRP_ASSERT(first->x <= x0);
+
+   #if 0
+   // skip in case we're past the node
+   while (node->next->x <= x0)
+      ++node;
+   #else
+   STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
+   #endif
+
+   STBRP_ASSERT(node->x <= x0);
+
+   min_y = 0;
+   waste_area = 0;
+   visited_width = 0;
+   while (node->x < x1) {
+      if (node->y > min_y) {
+         // raise min_y higher.
+         // we've accounted for all waste up to min_y,
+         // but we'll now add more waste for everything we've visited
+         waste_area += visited_width * (node->y - min_y);
+         min_y = node->y;
+         // the first time through, visited_width might be reduced
+         if (node->x < x0)
+            visited_width += node->next->x - x0;
+         else
+            visited_width += node->next->x - node->x;
+      } else {
+         // add waste area
+         int under_width = node->next->x - node->x;
+         if (under_width + visited_width > width)
+            under_width = width - visited_width;
+         waste_area += under_width * (min_y - node->y);
+         visited_width += under_width;
+      }
+      node = node->next;
+   }
+
+   *pwaste = waste_area;
+   return min_y;
+}
+
+typedef struct
+{
+   int x,y;
+   stbrp_node **prev_link;
+} stbrp__findresult;
+
+static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
+{
+   int best_waste = (1<<30), best_x, best_y = (1 << 30);
+   stbrp__findresult fr;
+   stbrp_node **prev, *node, *tail, **best = NULL;
+
+   // align to multiple of c->align
+   width = (width + c->align - 1);
+   width -= width % c->align;
+   STBRP_ASSERT(width % c->align == 0);
+
+   // if it can't possibly fit, bail immediately
+   if (width > c->width || height > c->height) {
+      fr.prev_link = NULL;
+      fr.x = fr.y = 0;
+      return fr;
+   }
+
+   node = c->active_head;
+   prev = &c->active_head;
+   while (node->x + width <= c->width) {
+      int y,waste;
+      y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
+      if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
+         // bottom left
+         if (y < best_y) {
+            best_y = y;
+            best = prev;
+         }
+      } else {
+         // best-fit
+         if (y + height <= c->height) {
+            // can only use it if it first vertically
+            if (y < best_y || (y == best_y && waste < best_waste)) {
+               best_y = y;
+               best_waste = waste;
+               best = prev;
+            }
+         }
+      }
+      prev = &node->next;
+      node = node->next;
+   }
+
+   best_x = (best == NULL) ? 0 : (*best)->x;
+
+   // if doing best-fit (BF), we also have to try aligning right edge to each node position
+   //
+   // e.g, if fitting
+   //
+   //     ____________________
+   //    |____________________|
+   //
+   //            into
+   //
+   //   |                         |
+   //   |             ____________|
+   //   |____________|
+   //
+   // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
+   //
+   // This makes BF take about 2x the time
+
+   if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
+      tail = c->active_head;
+      node = c->active_head;
+      prev = &c->active_head;
+      // find first node that's admissible
+      while (tail->x < width)
+         tail = tail->next;
+      while (tail) {
+         int xpos = tail->x - width;
+         int y,waste;
+         STBRP_ASSERT(xpos >= 0);
+         // find the left position that matches this
+         while (node->next->x <= xpos) {
+            prev = &node->next;
+            node = node->next;
+         }
+         STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
+         y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
+         if (y + height <= c->height) {
+            if (y <= best_y) {
+               if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
+                  best_x = xpos;
+                  //STBRP_ASSERT(y <= best_y); [DEAR IMGUI]
+                  best_y = y;
+                  best_waste = waste;
+                  best = prev;
+               }
+            }
+         }
+         tail = tail->next;
+      }
+   }
+
+   fr.prev_link = best;
+   fr.x = best_x;
+   fr.y = best_y;
+   return fr;
+}
+
+static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
+{
+   // find best position according to heuristic
+   stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
+   stbrp_node *node, *cur;
+
+   // bail if:
+   //    1. it failed
+   //    2. the best node doesn't fit (we don't always check this)
+   //    3. we're out of memory
+   if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
+      res.prev_link = NULL;
+      return res;
+   }
+
+   // on success, create new node
+   node = context->free_head;
+   node->x = (stbrp_coord) res.x;
+   node->y = (stbrp_coord) (res.y + height);
+
+   context->free_head = node->next;
+
+   // insert the new node into the right starting point, and
+   // let 'cur' point to the remaining nodes needing to be
+   // stitched back in
+
+   cur = *res.prev_link;
+   if (cur->x < res.x) {
+      // preserve the existing one, so start testing with the next one
+      stbrp_node *next = cur->next;
+      cur->next = node;
+      cur = next;
+   } else {
+      *res.prev_link = node;
+   }
+
+   // from here, traverse cur and free the nodes, until we get to one
+   // that shouldn't be freed
+   while (cur->next && cur->next->x <= res.x + width) {
+      stbrp_node *next = cur->next;
+      // move the current node to the free list
+      cur->next = context->free_head;
+      context->free_head = cur;
+      cur = next;
+   }
+
+   // stitch the list back in
+   node->next = cur;
+
+   if (cur->x < res.x + width)
+      cur->x = (stbrp_coord) (res.x + width);
+
+#ifdef _DEBUG
+   cur = context->active_head;
+   while (cur->x < context->width) {
+      STBRP_ASSERT(cur->x < cur->next->x);
+      cur = cur->next;
+   }
+   STBRP_ASSERT(cur->next == NULL);
+
+   {
+      int count=0;
+      cur = context->active_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      cur = context->free_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      STBRP_ASSERT(count == context->num_nodes+2);
+   }
+#endif
+
+   return res;
+}
+
+static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   if (p->h > q->h)
+      return -1;
+   if (p->h < q->h)
+      return  1;
+   return (p->w > q->w) ? -1 : (p->w < q->w);
+}
+
+static int STBRP__CDECL rect_original_order(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
+}
+
+STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
+{
+   int i, all_rects_packed = 1;
+
+   // we use the 'was_packed' field internally to allow sorting/unsorting
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = i;
+   }
+
+   // sort according to heuristic
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
+
+   for (i=0; i < num_rects; ++i) {
+      if (rects[i].w == 0 || rects[i].h == 0) {
+         rects[i].x = rects[i].y = 0;  // empty rect needs no space
+      } else {
+         stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
+         if (fr.prev_link) {
+            rects[i].x = (stbrp_coord) fr.x;
+            rects[i].y = (stbrp_coord) fr.y;
+         } else {
+            rects[i].x = rects[i].y = STBRP__MAXVAL;
+         }
+      }
+   }
+
+   // unsort
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
+
+   // set was_packed flags and all_rects_packed status
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
+      if (!rects[i].was_packed)
+         all_rects_packed = 0;
+   }
+
+   // return the all_rects_packed status
+   return all_rects_packed;
+}
+#endif
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

src/main.cpp

@@ -5,28 +5,33 @@
 
 #include "glm/glm.hpp"
 #include "glm/ext/matrix_clip_space.hpp"
-#include "glm/ext/matrix_transform.hpp"
-
-#include "entt/entt.hpp"
 
 #define STB_IMAGE_IMPLEMENTATION
-#include "Components.h"
+#include "AssetRegistry.h"
-#include "FreeCamera.h"
-#include "imgui.h"
-#include "imgui_impl_glfw.h"
-#include "imgui_impl_opengl3.h"
-#include "InputManager.h"
 #include "stb_image.h"
 
-#include "Model.h"
+#include "Camera.h"
-#include "ModelManager.h"
+#include "EditorContext.h"
+#include "FreeCameraController.h"
+#include "InputManager.h"
+#include "ProjectManifest.h"
+#include "ProjectManifestFile.h"
 #include "Scene.h"
 #include "ShaderManager.h"
 #include "ShaderProgram.h"
-#include "Texture.h"
 #include "TextureManager.h"
 
-#include "fmt/base.h"
+#include "UIManager.h"
+#include "ui/UIEntityInspector.h"
+#include "ui/UIMenuBar.h"
+#include "ui/UISceneGraph.h"
+#include "ui/UISceneViewer.h"
+
+#include <filesystem>
+
+#include "MeshManager.h"
+
+const char* B_ENGINE_VERSION = "v0.0.3";
 
 GLFWwindow* gWindow = nullptr;
 int gWindowWidth = 1920;
@@ -39,9 +44,13 @@ float gAspectRatio = 0.f;
 
 float gMouseSensitivity = 0.1f;
 
-FreeCamera gCamera {};
+std::unique_ptr<ProjectManifest> gCurrentProject {nullptr};
 
 Scene gScene{};
+EditorContext gEditorCtx{};
+
+Camera gCamera {};
+FreeCameraController gEditorCameraController{};
 
 void glfw_error_callback(int error, const char* description);
 void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
@@ -50,21 +59,19 @@ void glfw_framebuffer_size_callback(GLFWwindow* window, int width, int height);
 void init_glfw();
 void create_main_window();
 void load_gl();
-void load_imgui();
-void init_camera();
-void load_default_textures();
-void load_shaders();
 void load_inputs();
-void load_default_models();
+void init_editor_camera();
 void loop();
-void draw_ui();
+
+void create_entity(entt::entity parent);
+void open_project(std::string_view _path);
 
 auto xAxis = glm::vec3{1.f, 0.f, 0.f};
 auto yAxis = glm::vec3{0.f, 1.f, 0.f};
 auto zAxis = glm::vec3{0.f, 0.f, 1.f};
 
 int main() {
-    spdlog::info("b_engine v0.0.3 start");
+    spdlog::info("b_engine {} start", B_ENGINE_VERSION);
 
     init_glfw();
 
@@ -72,35 +79,34 @@ int main() {
 
     load_gl();
 
-    load_imgui();
-
-    init_camera();
-
     stbi_set_flip_vertically_on_load(true);
 
-    load_default_textures();
-
-    load_shaders();
-
     load_inputs();
 
-    load_default_models();
+    UIManager::init(gWindow);
+    auto* menuBar = UIManager::add_ui_panel<UIMenuBar>("menu_bar");
+    menuBar->create_entity = create_entity;
+    menuBar->open_project = open_project;
+    UIManager::add_ui_panel<UISceneViewer>("scene_viewer");
+    UIManager::add_ui_panel<UISceneGraph>("scene_graph");
+    UIManager::add_ui_panel<UIEntityInspector>("entity_inspector");
 
-    entt::entity dirLight = gScene.create_game_object();
+    gEditorCameraController.set_camera(gCamera);
-    auto& [direction, ambient, diffuse, specular] = gScene.attach_component<Components::DirectionalLight>(dirLight);
+    gEditorCameraController.look_sensitivity = 0.2;
-    direction = {1, -1, 1};
+    gEditorCameraController.movement_speed = 0.2;
-    ambient = {0.3f, 0.3f, 0.3f};
+    InputManager::add_mouse_listener([](float xoff, float yoff) {
-    diffuse = {0.5f, 0.5f, 0.5f};
+        gEditorCameraController.on_mouse_delta(xoff, yoff);
-    specular = {1.0f, 1.0f, 1.0f};
+    });
 
-    auto& tag = gScene.fetch_component<Components::Tag>(dirLight);
+    gEditorCtx.scene = &gScene;
-    tag.name = "directional light";
+    gEditorCtx.window = gWindow;
+    gEditorCtx.selectedEntity = entt::null;
 
     loop();
 
     ShaderManager::shaders.clear();
     TextureManager::textures.clear();
-    ModelManager::models.clear();
+    MeshManager::meshes.clear();
 
     glfwDestroyWindow(gWindow);
     glfwTerminate();
@@ -118,8 +124,7 @@ void glfw_framebuffer_size_callback(GLFWwindow *window, int width, int height) {
     gCamera.update_aspect_ratio(gAspectRatio);
 }
 
-void init_glfw()
+void init_glfw() {
-{
     if (!glfwInit()) {
         spdlog::error("could not initialize glfw");
         std::exit(1);
@@ -135,7 +140,8 @@ void init_glfw()
 
 void create_main_window()
 {
-    gWindow = glfwCreateWindow(gWindowWidth, gWindowHeight, "b_engine v0.0.3", nullptr, nullptr);
+    std::string title = fmt::format("b_engine {}", B_ENGINE_VERSION);
+    gWindow = glfwCreateWindow(gWindowWidth, gWindowHeight, title.c_str(), nullptr, nullptr);
     if (!gWindow) {
         spdlog::error("failed to create glfw window");
         std::exit(1);
@@ -147,10 +153,6 @@ void create_main_window()
     glfwSetCursorPosCallback(gWindow, InputManager::mouse_pos_callback);
 
     glfwSetFramebufferSizeCallback(gWindow, glfw_framebuffer_size_callback);
-
-#ifndef GLFW_CONTEXT_DEBUG
-    glfwSetInputMode(gWindow, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
-#endif
 }
 
 void load_gl()
@@ -171,44 +173,10 @@ void load_gl()
     glEnable(GL_MULTISAMPLE);
 }
 
-void load_imgui() {
+void init_editor_camera() {
-    IMGUI_CHECKVERSION();
+    gCamera = {{10.f, 10.f, 10.f}, 0, 0, gAspectRatio};
-    ImGui::CreateContext();
-
-    ImGui::StyleColorsDark();
-    ImGui_ImplGlfw_InitForOpenGL(gWindow, true);
-    ImGui_ImplOpenGL3_Init("#version 330");
-}
-
-void init_camera() {
-    gCamera = {{5.f, 5.f, 5.f}, 0, 0, gAspectRatio};
     gCamera.rotate_yaw(-135.f);
     gCamera.rotate_pitch(-35.f);
-
-    InputManager::add_mouse_listener([](float xoff, float yoff) {
-        gCamera.rotate_yaw(xoff * gMouseSensitivity);
-        gCamera.rotate_pitch(yoff * gMouseSensitivity);
-    });
-}
-
-void load_default_textures() {
-    spdlog::info("creating default textures");
-
-    unsigned char defaultDiffuseData[4] = {static_cast<unsigned char>(255), 255, 255, 255};
-    TextureManager::textures["default_diffuse"] = TextureManager::load_from_data(reinterpret_cast<unsigned char*>(&defaultDiffuseData), 1, 1, 4);
-
-    unsigned char defaultSpecularData[4] = {static_cast<unsigned char>(64), 64, 64, 255};
-    TextureManager::textures["default_specular"] = TextureManager::load_from_data(reinterpret_cast<unsigned char*>(&defaultSpecularData), 1, 1, 4);
-}
-
-void load_shaders() {
-    spdlog::info("compiling shaders");
-    ShaderManager::shaders["phong_shader"] = ShaderManager::load("./resources/standard.vert", "./resources/standard.frag");
-    if (ShaderManager::shaders["phong_shader"] == nullptr)
-    {
-        spdlog::error("failed to compile phong shader");
-        std::exit(1);
-    }
 }
 
 void load_inputs() {
@@ -218,119 +186,57 @@ void load_inputs() {
     InputManager::generate_input_action("move_left", {{GLFW_KEY_A, KEY_DOWN}});
     InputManager::generate_input_action("move_up", {{GLFW_KEY_SPACE, KEY_DOWN}});
     InputManager::generate_input_action("move_down", {{GLFW_KEY_LEFT_SHIFT, KEY_DOWN}});
-    InputManager::generate_input_action("exit_application", {{GLFW_KEY_ESCAPE, KEY_DOWN}});
-}
-
-void load_default_models() {
-    spdlog::info("loading default models");
-    ModelManager::models["cube"] = ModelManager::load_from_file("./resources/cube.obj");
-    ModelManager::models["vette"] = ModelManager::load_from_file("./resources/c4/C4Fixed.obj");
-    ModelManager::models["male"] = ModelManager::load_from_file("./resources/male.obj");
 }
 
 void loop() {
     while (!glfwWindowShouldClose(gWindow)) {
+        // input
         glfwPollEvents();
 
-        // check inputs
+        // update
-        if (InputManager::check_action_performed("exit_application")) {
+        UIManager::update(gEditorCtx);
-            glfwSetWindowShouldClose(gWindow, true);
+        gEditorCameraController.update(gEditorCtx);
-            continue;
+
+        if (gCamera.aspect_ratio() != gEditorCtx.viewportAspectRatio) {
+            gCamera.update_aspect_ratio(gEditorCtx.viewportAspectRatio);
         }
 
-        if (InputManager::check_action_performed("move_forward")) {
+        gScene.update_transforms();
-            gCamera.move(FORWARD, .05);
+
+        const auto* uiScenePanel = dynamic_cast<UISceneViewer*>(UIManager::get_ui_panel("scene_viewer").get());
+        if (uiScenePanel) {
+            uiScenePanel->bind_fbo();
         }
 
-        if (InputManager::check_action_performed("move_backward")) {
+        // draw
-            gCamera.move(BACKWARD, .05);
-        }
-
-        if (InputManager::check_action_performed("move_left")) {
-            gCamera.move(LEFT, .05);
-        }
-
-        if (InputManager::check_action_performed("move_right")) {
-            gCamera.move(RIGHT, .05);
-        }
-
-        if (InputManager::check_action_performed("move_up")) {
-            gCamera.move(UP, .05);
-        }
-
-        if (InputManager::check_action_performed("move_down")) {
-            gCamera.move(DOWN, .05);
-        }
-
-        draw_ui();
-
-        // gl frame prep
         glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+        gScene.draw_scene();
-
-        const auto shader = ShaderManager::shaders["phong_shader"];
-        shader->bind();
-        shader->setMat4("projection", gCamera.projection());
-        shader->setMat4("view", gCamera.view());
-        shader->setVec3("viewPosition", gCamera.position());
-
-        gScene.draw_scene(shader.get());
 
         glBindVertexArray(0);
         ShaderProgram::unbind();
+        glBindFramebuffer(GL_FRAMEBUFFER, 0);
 
-        // gl end frame stuff
+        UIManager::draw();
+
+        // end frame
         glfwSwapBuffers(gWindow);
     }
 }
 
-void draw_ui() {
+void create_entity(entt::entity parent) {
-    ImGui_ImplOpenGL3_NewFrame();
+    gScene.create_game_object(parent);
-    ImGui_ImplGlfw_NewFrame();
+}
-    ImGui::NewFrame();
-    {
-        if (ImGui::Begin("Scene")) {
-            ImGui::Text("Scene");
-            const auto root = gScene.get_root();
-            auto entity = gScene.fetch_component<Components::Relationship>(root).first_child;
-            while (entity != entt::null) {
-                const auto&[name] = gScene.fetch_component<Components::Tag>(entity);
-                std::string text = fmt::format("    {0}", name);
-                ImGui::Text((char*)text.data());
-                entity = gScene.fetch_component<Components::Relationship>(entity).next_sibling;
-            }
-            ImGui::End();
-        }
 
-        if (ImGui::BeginMainMenuBar()) {
+void open_project(std::string_view _path) {
-            if (ImGui::BeginMenu("File")) {
+    const std::filesystem::path projectFilePath {_path};
-                if (ImGui::MenuItem("New Scene", "Ctrl+N")) {
+    gCurrentProject = ProjectManifestFile::load(_path);
-                    /* Handle New File logic */
+    gCurrentProject->projectDirectory = projectFilePath.parent_path();
-                }
-                if (ImGui::MenuItem("Open Scene", "Ctrl+O")) {
-                    /* Handle Open logic */
-                }
-                ImGui::Separator(); // Adds a visual line between sections
-                if (ImGui::MenuItem("Save", "Ctrl+S")) {
-                    /* Handle Save logic */
-                }
-                if (ImGui::MenuItem("Exit", "Alt+F4")) {
-                    /* Handle Exit logic */
-                }
-                ImGui::EndMenu();
-            }
 
-            if (ImGui::BeginMenu("Scene")) {
+    std::filesystem::path assetPath = gCurrentProject->projectDirectory.append(gCurrentProject->assetFolder);
-                if (ImGui::MenuItem("New Scene Object")) {
+    AssetRegistry::read_directory(assetPath);
-                    gScene.create_game_object();
+
-                    // Do other stuff here, open this entity in the entity editor, etc...
+    const std::string title = fmt::format("project \"{}\" | b_engine {}", gCurrentProject->name, B_ENGINE_VERSION);
-                }
+    glfwSetWindowTitle(gWindow, title.c_str());
-                ImGui::EndMenu();
+}
-            }
-            ImGui::EndMainMenuBar();
-        }
-    }
-    ImGui::Render();
-}

src/ui/IUIPanel.h

@@ -0,0 +1,18 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_IUIPANEL_H
+#define B_ENGINE_IUIPANEL_H
+
+#include "EditorContext.h"
+
+class IUIPanel {
+public:
+    virtual ~IUIPanel() = default;
+    virtual void update(EditorContext& context) = 0;
+    bool IsOpen = true;
+    bool HasFocus = true;
+};
+
+#endif //B_ENGINE_IUIPANEL_H

src/ui/UIEntityInspector.cpp

@@ -0,0 +1,63 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#include "UIEntityInspector.h"
+
+#include "Components.h"
+#include "imgui.h"
+#include "glm/gtc/type_ptr.hpp"
+
+void UIEntityInspector::update(EditorContext &ctx) {
+    ImGui::Begin("Inspector");
+
+    if (ctx.selectedEntity == entt::null)
+    {
+        ImGui::TextDisabled("No entity selected");
+        ImGui::End();
+        return;
+    }
+
+    Scene* scene = ctx.scene;
+    auto entity = ctx.selectedEntity;
+
+    if (scene->has_component<Components::Tag>(entity))
+    {
+        auto& [name] = scene->fetch_component<Components::Tag>(entity);
+
+        char buffer[256]{};
+        memset(buffer, 0, sizeof(buffer));
+
+        strncpy(buffer, name.c_str(), sizeof(buffer) - 1);
+
+        if (ImGui::InputText("Tag", buffer, sizeof(buffer)))
+        {
+            name = std::string(buffer);
+        }
+    }
+
+    ImGui::Separator();
+
+    if (scene->has_component<Components::Transform>(entity))
+    {
+        auto& transform = scene->fetch_component<Components::Transform>(entity);
+        ImGui::Text("Transform");
+
+        if (ImGui::DragFloat3("Position", glm::value_ptr(transform.position), 0.1f))
+        {
+            transform.dirty = true;
+        }
+
+        if (ImGui::DragFloat3("Rotation", glm::value_ptr(transform.rotation), 0.05f))
+        {
+            transform.dirty = true;
+        }
+
+        if (ImGui::DragFloat3("Scale", glm::value_ptr(transform.scale), 0.1f))
+        {
+            transform.dirty = true;
+        }
+    }
+
+    ImGui::End();
+}

src/ui/UIEntityInspector.h

@@ -0,0 +1,17 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_UIENTITYINSPECTOR_H
+#define B_ENGINE_UIENTITYINSPECTOR_H
+
+#include "EditorContext.h"
+#include "IUIPanel.h"
+
+class UIEntityInspector : public IUIPanel {
+public:
+    void update(EditorContext& ctx) override;
+};
+
+
+#endif //B_ENGINE_UIENTITYINSPECTOR_H

src/ui/UIMenuBar.cpp

@@ -0,0 +1,55 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#include "UIMenuBar.h"
+#include "UIManager.h"
+#include "UISceneGraph.h"
+
+#include "imgui.h"
+
+#include "nfd.h"
+
+void UIMenuBar::update(EditorContext &context) {
+    if (ImGui::BeginMainMenuBar()) {
+        if (ImGui::BeginMenu("File")) {
+            if (ImGui::MenuItem("New Project")) {
+            }
+            if (ImGui::MenuItem("Open Project")) {
+                NFD_Init();
+
+                nfdu8char_t *outPath;
+                nfdu8filteritem_t filters[1] = { { "b_engine project files", "json" } };
+                nfdopendialogu8args_t args = {0};
+                args.filterList = filters;
+                args.filterCount = 1;
+                nfdresult_t result = NFD_OpenDialogU8_With(&outPath, &args);
+
+                if (result == NFD_OKAY && open_project)
+                {
+                    open_project(outPath);
+                    NFD_FreePathU8(outPath);
+                }
+
+                NFD_Quit();
+            }
+            ImGui::Separator(); // Adds a visual line between sections
+            if (ImGui::MenuItem("Save", "Ctrl+S")) {
+            }
+            if (ImGui::MenuItem("Exit", "Alt+F4")) {
+            }
+            ImGui::EndMenu();
+        }
+
+        if (ImGui::BeginMenu("Scene")) {
+            if (ImGui::MenuItem("New Scene Object")) {
+                const auto* sceneGraph = dynamic_cast<UISceneGraph*>(UIManager::get_ui_panel("scene_graph").get());
+                if (sceneGraph) {
+                    create_entity(context.selectedEntity);
+                }
+            }
+            ImGui::EndMenu();
+        }
+        ImGui::EndMainMenuBar();
+    }
+}

src/ui/UIMenuBar.h

@@ -0,0 +1,19 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_UIMENUBAR_H
+#define B_ENGINE_UIMENUBAR_H
+
+#include "IUIPanel.h"
+
+class UIMenuBar : public IUIPanel {
+public:
+    void update(EditorContext &context) override;
+
+    std::function<void(entt::entity)> create_entity;
+    std::function<void(std::string_view path)> open_project;
+};
+
+
+#endif //B_ENGINE_UIMENUBAR_H

src/ui/UISceneGraph.cpp

@@ -0,0 +1,53 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#include "UISceneGraph.h"
+
+#include "Components.h"
+#include "imgui.h"
+#include "Scene.h"
+
+void UISceneGraph::update(EditorContext &ctx) {
+    ImGui::Begin("Hierarchy");
+
+    if (ImGui::IsWindowHovered() && ImGui::IsMouseClicked(ImGuiMouseButton_Left))
+    {
+        ctx.selectedEntity = entt::null;
+    }
+
+    Scene* scene = ctx.scene;
+    if (!scene) return;
+
+    draw_children(scene->get_root(), scene, ctx);
+
+    ImGui::End();
+}
+
+void UISceneGraph::draw_children(entt::entity parent, Scene *scene, EditorContext& ctx) {
+    std::vector<entt::entity> children = scene->get_children(parent);
+    for (const auto e : children) {
+        const auto& rel = scene->fetch_component<Components::Relationship>(e);
+        ImGuiTreeNodeFlags flags =
+            ImGuiTreeNodeFlags_OpenOnArrow |
+            ImGuiTreeNodeFlags_SpanFullWidth;
+
+        if (rel.first_child == entt::null) {
+            flags |= ImGuiTreeNodeFlags_Leaf;
+        }
+
+        const auto& [name] = scene->fetch_component<Components::Tag>(e);
+        if (ImGui::TreeNodeEx((void*)(intptr_t)e, flags, "%s", name.data()))
+        {
+            draw_children(e, scene, ctx);
+            ImGui::TreePop();
+        }
+
+        if (ImGui::IsItemClicked())
+        {
+            ctx.selectedEntity = e;
+        }
+    }
+}
+
+

src/ui/UISceneGraph.h

@@ -0,0 +1,20 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_UISCENEGRAPH_H
+#define B_ENGINE_UISCENEGRAPH_H
+
+#include "IUIPanel.h"
+#include "Scene.h"
+
+#include "entt/entt.hpp"
+
+class UISceneGraph : public IUIPanel {
+public:
+    void update(EditorContext& ctx) override;
+private:
+    void draw_children(entt::entity e, Scene* scene, EditorContext& ctx);
+};
+
+#endif //B_ENGINE_UISCENEGRAPH_H

src/ui/UISceneViewer.cpp

@@ -0,0 +1,88 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#include "UISceneViewer.h"
+
+#include "GLFW/glfw3.h"
+
+UISceneViewer::UISceneViewer() {
+    create_scene_framebuffer();
+    resize_scene_framebuffer(1, 1);
+}
+
+void UISceneViewer::update(EditorContext& ctx) {
+    ImGui::Begin("Scene");
+
+    const ImVec2 viewportSize = ImGui::GetContentRegionAvail();
+    if (viewportSize.x > 0.0f && viewportSize.y > 0.0f)
+    {
+        if (sceneViewportSize.x != viewportSize.x ||
+            sceneViewportSize.y != viewportSize.y)
+        {
+            sceneViewportSize = viewportSize;
+            resize_scene_framebuffer((int)sceneViewportSize.x, (int)sceneViewportSize.y);
+
+            ctx.viewportSize = {sceneViewportSize.x, sceneViewportSize.y};
+            ctx.viewportAspectRatio = sceneViewportSize.x / sceneViewportSize.y;
+        }
+
+        ImGui::Image(
+            sceneRenderTexture,
+            viewportSize,
+            ImVec2(0, 1),
+            ImVec2(1, 0)
+        );
+
+        bool hovered = ImGui::IsItemHovered();
+        if (hovered && ImGui::IsMouseClicked(ImGuiMouseButton_Left))
+        {
+            capturedMouse = true;
+            ctx.sceneViewerFocused = true;
+
+            glfwSetInputMode(ctx.window,
+                             GLFW_CURSOR,
+                             GLFW_CURSOR_DISABLED);
+        }
+
+        if (capturedMouse && ImGui::IsMouseReleased(ImGuiMouseButton_Right))
+        {
+            capturedMouse = false;
+            ctx.sceneViewerFocused = false;
+
+            glfwSetInputMode(ctx.window,
+                             GLFW_CURSOR,
+                             GLFW_CURSOR_NORMAL);
+        }
+    }
+    ImGui::End();
+}
+
+void UISceneViewer::bind_fbo() const {
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+}
+
+void UISceneViewer::create_scene_framebuffer() {
+    glGenFramebuffers(1, &fbo);
+    resize_scene_framebuffer(1, 1);
+}
+
+void UISceneViewer::resize_scene_framebuffer(int width, int height) {
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+    glGenTextures(1, &sceneRenderTexture);
+    glBindTexture(GL_TEXTURE_2D, sceneRenderTexture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, sceneRenderTexture, 0);
+
+    glGenRenderbuffers(1, &rbo);
+    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindRenderbuffer(GL_RENDERBUFFER, 0);
+}

src/ui/UISceneViewer.h

@@ -0,0 +1,38 @@
+//
+// Created by slinky on 5/11/26.
+//
+
+#ifndef B_ENGINE_UISCENEVIEWER_H
+#define B_ENGINE_UISCENEVIEWER_H
+
+#include "glad/gl.h"
+#include "imgui.h"
+#include "IUIPanel.h"
+
+#include "Scene.h"
+#include "Camera.h"
+
+class UISceneViewer : public IUIPanel {
+public:
+    UISceneViewer();
+
+    void update(EditorContext& ctx) override;
+
+    void bind_fbo() const;
+private:
+    ImVec2 sceneViewportSize = { 0.0f, 0.0f };
+    GLuint sceneRenderTexture = 0;
+    GLuint fbo = 0;
+    GLuint rbo = 0;
+
+    Scene* scene = nullptr;
+    Camera* camera = nullptr;
+
+    bool capturedMouse = false;
+
+    void create_scene_framebuffer();
+    void resize_scene_framebuffer(int width, int height);
+};
+
+
+#endif //B_ENGINE_UISCENEVIEWER_H