Huge stuff. camera, input manager (mouse + keyboard), can move around scene now

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 4.1)
-project(b_engine VERSION 0.0.1 LANGUAGES CXX C)
+project(b_engine VERSION 0.0.2 LANGUAGES CXX C)
 
 set(CMAKE_CXX_STANDARD 20)
 
@@ -26,17 +26,27 @@ add_executable(${PROJECT_NAME}
         src/Mesh.h
         src/Model.cpp
         src/Model.h
-        src/Material.cpp
         src/Material.h
-        src/ModelLoader.cpp
-        src/ModelLoader.h
+        src/ModelManager.cpp
+        src/ModelManager.h
         src/ShaderProgram.cpp
         src/ShaderProgram.h
         src/Texture.h
-        src/TextureLoader.cpp
-        src/TextureLoader.h
+        src/TextureManager.cpp
+        src/TextureManager.h
         src/ShaderManager.cpp
-        src/ShaderManager.h)
+        src/ShaderManager.h
+        src/FreeCamera.cpp
+        src/FreeCamera.h
+        src/InputManager.cpp
+        src/InputManager.h)
+
+add_custom_target(copy_resources
+        COMMAND ${CMAKE_COMMAND} -E copy_directory
+        "${CMAKE_CURRENT_SOURCE_DIR}/resources"
+        "${CMAKE_CURRENT_BINARY_DIR}/resources"
+        COMMENT "Copying resources..."
+)
 
 target_link_libraries(${PROJECT_NAME} glfw spdlog assimp glm)
 target_include_directories(${PROJECT_NAME} PRIVATE ${ASSIMP_INCLUDE_INSTALL_DIR})

resources/backpack/backpack.mtl

@@ -10,7 +10,7 @@ Ke 0.0 0.0 0.0
 Ni 1.450000
 d 1.000000
 illum 2
-map_Kd backpack/diffuse.jpg
-map_Bump backpack/normal.png
-map_Ks backpack/specular.jpg
+map_Kd diffuse.jpg
+map_Bump normal.png
+map_Ks specular.jpg
 

resources/standard.frag

@@ -6,7 +6,8 @@ in vec3 Position;
 in vec2 TexCoord;
 in vec3 Normal;
 
-uniform sampler2D diffuse;
+uniform sampler2D diffuseMap;
+uniform sampler2D specularMap;
 
 uniform vec3 viewPosition;
 
@@ -15,22 +16,30 @@ uniform vec3 phongDiffuse;
 uniform vec3 phongSpecular;
 uniform float phongShininess;
 
+uniform vec3 lightPosition;
 uniform vec3 lightDirection;
 uniform vec3 lightAmbient;
 uniform vec3 lightDiffuse;
 uniform vec3 lightSpecular;
 
 void main() {
-    vec4 diffuseColor = texture(diffuse, TexCoord);
+    vec3 diffuseColor = texture(diffuseMap, TexCoord).rgb;
+    vec3 specularColor = texture(specularMap, TexCoord).rgb;
 
     vec3 norm = normalize(Normal);
     vec3 lightDir = normalize(-lightDirection);
+    vec3 viewDir = normalize(viewPosition - Position);
 
-    vec3 ambient = phongAmbient * vec3(diffuseColor);
+    vec3 ambient = lightAmbient * (diffuseColor * phongAmbient);
 
     float diffImpact = max(dot(norm, lightDir), 0.0);
-    vec3 diffuse = (phongDiffuse * vec3(diffuseColor)) * diffImpact;
+    vec3 diffuse = lightDiffuse * (diffImpact * diffuseColor * phongDiffuse);
 
-    vec3 result = ambient + diffuse;
+    vec3 reflectDir = reflect(-lightDir, norm);
+    float effectiveShininess = max(phongShininess, 1.0);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), effectiveShininess);
+    vec3 specular = lightSpecular * (spec * specularColor * phongSpecular);
+
+    vec3 result = ambient + diffuse + specular;
     FragColor = vec4(result, 1.0);
 }

src/FreeCamera.cpp

@@ -0,0 +1,99 @@
+//
+// 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/FreeCamera.h

@@ -0,0 +1,61 @@
+//
+// Created by slinky on 5/3/26.
+//
+
+#ifndef B_ENGINE_CAMERA_H
+#define B_ENGINE_CAMERA_H
+
+#include <glm/glm.hpp>
+
+constexpr float MAX_PITCH = 89.f;
+constexpr float MIN_PITCH = -89.f;
+
+constexpr glm::vec3 WORLD_UP = {0.0f, 1.0f, 0.0f};
+
+enum CAMERA_MOVEMENT {
+    FORWARD,
+    BACKWARD,
+    LEFT,
+    RIGHT,
+    UP,
+    DOWN,
+};
+
+class FreeCamera {
+public:
+    FreeCamera() = default;
+    FreeCamera(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;
+
+    void update_aspect_ratio(float aspectRatio);
+    void rotate_yaw(float offset);
+    void rotate_pitch(float offset);
+
+    void move(CAMERA_MOVEMENT direction, float offset);
+private:
+    void update_camera_vectors();
+    void update_projection();
+    void update_view();
+
+    glm::vec3 _position{};
+
+    glm::vec3 front{};
+    glm::vec3 up{};
+    glm::vec3 right{};
+
+    glm::mat4 _view{};
+    glm::mat4 _projection{};
+
+    float _yaw = 0;
+    float _pitch = 0;
+
+    float _aspectRatio = 0;
+
+    float _sensitivity = 0.1f;
+};
+
+
+#endif //B_ENGINE_CAMERA_H

src/InputManager.cpp

@@ -0,0 +1,118 @@
+//
+// Created by slinky on 5/3/26.
+//
+
+#include "InputManager.h"
+
+bool InputManager::mouseInit = false;
+float InputManager::lastMousePositionX = 0;
+float InputManager::lastMousePositionY = 0;
+std::unordered_map<std::string, std::unique_ptr<InputAction>> InputManager::registeredActions = {};
+
+static bool currentKeyStatesData[512] = {};
+bool* InputManager::currentKeyStates = currentKeyStatesData;
+
+static bool previousKeyStatesData[512] = {};
+bool* InputManager::previousKeyStates = previousKeyStatesData;
+
+std::vector<MouseDeltaCallback> InputManager::mouse_listeners = {};
+
+void InputManager::mouse_pos_callback(GLFWwindow *window, double x, double y) {
+    const auto xpos = static_cast<float>(x);
+    const auto ypos = static_cast<float>(y);
+
+    if (!mouseInit) {
+        lastMousePositionX = xpos;
+        lastMousePositionY = ypos;
+        mouseInit = true;
+    }
+
+    float xOff = xpos - lastMousePositionX;
+    float yOff = lastMousePositionY - ypos;
+
+    lastMousePositionX = xpos;
+    lastMousePositionY = ypos;
+
+    for (const auto& cb : mouse_listeners) {
+        cb(xOff, yOff);
+    }
+}
+
+void InputManager::add_mouse_listener(MouseDeltaCallback callback) {
+    mouse_listeners.push_back(callback);
+}
+
+void InputManager::key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+    if (action == GLFW_REPEAT) return;
+
+    set_key_state(key, action == GLFW_PRESS);
+}
+
+void InputManager::generate_input_action(std::string_view actionName, std::initializer_list<InputRequirement> requirements) {
+    if (registeredActions.contains(actionName.data())) {
+        return;
+    }
+
+    InputAction action;
+    for (const auto& requirement : requirements) {
+        action.requirements.push_back(requirement);
+    }
+    const std::string key = actionName.data();
+    registeredActions[key] = std::make_unique<InputAction>(action);
+}
+
+bool InputManager::check_action_performed(std::string_view actionName) {
+    if (!registeredActions.contains(actionName.data())) {
+        return false;
+    }
+
+    InputAction* action = registeredActions[actionName.data()].get();
+
+    if (!action) {
+        return false;
+    }
+
+    for (const auto&[key, state] : action->requirements) {
+        switch (state) {
+            case KEY_DOWN:
+                if (!key_down(key))
+                    return false;
+                break;
+            case KEY_HELD:
+                if (!key_held(key))
+                    return false;
+                break;
+            case KEY_PRESSED:
+                if (!key_pressed(key))
+                    return false;
+                break;
+            case KEY_RELEASED:
+                if (!key_released(key))
+                    return false;
+                break;
+        }
+    }
+
+    return true;
+}
+
+bool InputManager::key_down(int key) {
+    return currentKeyStatesData[key];
+}
+bool InputManager::key_up(int key) {
+    return !currentKeyStatesData[key];
+}
+bool InputManager::key_pressed(int key) {
+    return !previousKeyStatesData[key] && currentKeyStatesData[key];
+}
+bool InputManager::key_released(int key) {
+    return previousKeyStatesData[key] && !currentKeyStatesData[key];
+}
+bool InputManager::key_held(int key) {
+    return previousKeyStatesData[key] && currentKeyStatesData[key];
+}
+
+void InputManager::set_key_state(int key, bool state) {
+    previousKeyStatesData[key] = currentKeyStatesData[key];
+    currentKeyStatesData[key] = state;
+}

src/InputManager.h

@@ -0,0 +1,61 @@
+//
+// Created by slinky on 5/3/26.
+//
+
+#ifndef B_ENGINE_INPUTMANAGER_H
+#define B_ENGINE_INPUTMANAGER_H
+
+#include <functional>
+#include <string>
+#include <initializer_list>
+#include <memory>
+
+#include "GLFW/glfw3.h"
+
+using MouseDeltaCallback = std::function<void(float, float)>;
+
+enum KeyState {
+    KEY_PRESSED,
+    KEY_HELD,
+    KEY_DOWN,
+    KEY_RELEASED,
+};
+
+struct InputRequirement {
+    int key;
+    KeyState state;
+};
+
+struct InputAction {
+    std::vector<InputRequirement> requirements{};
+};
+
+class InputManager {
+public:
+    static bool mouseInit;
+    static float lastMousePositionX;
+    static float lastMousePositionY;
+
+    static bool* currentKeyStates;
+    static bool* previousKeyStates;
+
+    static std::unordered_map<std::string, std::unique_ptr<InputAction>> registeredActions;
+
+    static void mouse_pos_callback(GLFWwindow* window, double x, double y);
+    static void add_mouse_listener(MouseDeltaCallback callback);
+
+    static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
+    static void generate_input_action(std::string_view actionName, std::initializer_list<InputRequirement> requirements);
+    static bool check_action_performed(std::string_view actionName);
+
+    static bool key_pressed(int key);
+    static bool key_held(int key);
+    static bool key_released(int key);
+    static bool key_down(int key);
+    static bool key_up(int key);
+private:
+    static std::vector<MouseDeltaCallback> mouse_listeners;
+    static void set_key_state(int key, bool state);
+};
+
+#endif //B_ENGINE_INPUTMANAGER_H

src/Material.cpp

@@ -1,5 +0,0 @@
-//
-// Created by lbmas on 4/28/2026.
-//
-
-#include "Material.h"

src/Mesh.cpp

@@ -8,7 +8,6 @@ Mesh::Mesh(const std::vector<float> &positions, const std::vector<float> &uvs, c
     ebo = 0;
     numIndices = indices.size();
 
-
     // positions
     GLuint positionVbo = 0;
     glGenBuffers(1, &positionVbo);

src/Mesh.h

@@ -18,9 +18,10 @@ public:
         const std::vector<float>& normals,
         const std::vector<unsigned int>& indices);
 
-    GLuint vao;
-    GLuint ebo;
-    unsigned int numIndices;
+    GLuint vao = 0;
+    GLuint ebo = 0;
+    unsigned int numIndices = 0;
+    unsigned int materialId = 0;
 };
 
 #endif //B_ENGINE_MESH_H

src/Model.h

@@ -7,15 +7,13 @@
 
 #include <string_view>
 #include <vector>
+#include <filesystem>
 
 #include "Mesh.h"
 #include "Material.h"
 
-class Model
+struct Model
 {
-public:
-    static std::shared_ptr<Model> load_from_file(std::string_view filename);
-
     std::vector<std::shared_ptr<Mesh>> meshes;
     std::vector<std::shared_ptr<Material>> materials;
 };

src/ModelManager.cpp

@@ -4,7 +4,7 @@
 
 #include <spdlog/spdlog.h>
 
-#include "ModelLoader.h"
+#include "ModelManager.h"
 
 #include <assimp/Importer.hpp>
 #include <assimp/postprocess.h>
@@ -12,15 +12,17 @@
 
 #include <cstring>
 
-#include "TextureLoader.h"
+#include "TextureManager.h"
 #include "glm/ext/matrix_transform.hpp"
 
-std::unordered_map<std::string, std::shared_ptr<Model>> ModelLoader::models;
+std::unordered_map<std::string, std::shared_ptr<Model>> ModelManager::models;
 
 void process_ai_mesh(aiMesh* aiMesh, const aiScene* scene, glm::mat4 transform, Mesh& mesh);
 void process_ai_node(aiNode* node, const aiScene* scene, glm::mat4 transform, Model* model);
 
-void process_ai_material(aiMaterial* aiMat, const aiScene* scene, Material& mat);
+void process_ai_material(aiMaterial* aiMat, const aiScene* scene, 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);
 
 auto zUpMatrix = glm::mat4(
     1.0f,  0.0f,  0.0f,  0.0f,  // Column 0
@@ -29,7 +31,7 @@ auto zUpMatrix = glm::mat4(
     0.0f,  0.0f,  0.0f,  1.0f   // Column 3
 );
 
-std::shared_ptr<Model> ModelLoader::load_from_file(std::string_view _path, bool zUp)
+std::shared_ptr<Model> ModelManager::load_from_file(std::string_view _path, bool zUp)
 {
     Assimp::Importer importer;
 
@@ -46,6 +48,16 @@ std::shared_ptr<Model> ModelLoader::load_from_file(std::string_view _path, bool
 
     auto model = std::make_shared<Model>();
 
+    std::filesystem::path modelPath = {_path};
+
+    model->materials.resize(scene->mNumMaterials);
+    for (unsigned int i = 0; i < scene->mNumMaterials; i++) {
+        aiMaterial* aiMat = scene->mMaterials[i];
+        Material mat{};
+        process_ai_material(aiMat, scene, mat, modelPath.parent_path());
+        model->materials[i] = std::make_shared<Material>(mat);
+    }
+
     auto transform = glm::identity<glm::mat4>();
     if (zUp) {
         transform = zUpMatrix;
@@ -58,20 +70,16 @@ std::shared_ptr<Model> ModelLoader::load_from_file(std::string_view _path, bool
 
 void process_ai_node(aiNode* node, const aiScene* scene, glm::mat4 transform, Model* model)
 {
-    auto m = node->mTransformation;
-    transform = transform * glm::mat4(m.a1, m.a2, m.a3, m.a4, m.b1, m.b2, m.b3, m.b4, m.c1, m.c2, m.c3, m.c4, m.d1, m.d2, m.d3, m.d4);
+    const auto t = node->mTransformation;
+    transform = transform * glm::mat4(t.a1, t.a2, t.a3, t.a4, t.b1, t.b2, t.b3, t.b4, t.c1, t.c2, t.c3, t.c4, t.d1, t.d2, t.d3, t.d4);
 
     for (unsigned int i = 0; i < node->mNumMeshes; i++)
     {
         aiMesh* aiMesh = scene->mMeshes[node->mMeshes[i]];
         Mesh mesh{};
+        mesh.materialId = aiMesh->mMaterialIndex;
         process_ai_mesh(aiMesh, scene, transform, mesh);
         model->meshes.push_back(std::make_shared<Mesh>(mesh));
-
-        aiMaterial* aiMat =  scene->mMaterials[aiMesh->mMaterialIndex];
-        Material mat{};
-        process_ai_material(aiMat, scene, mat);
-        model->materials.push_back(std::make_shared<Material>(mat));
     }
 
     for (unsigned int i = 0; i < node->mNumChildren; i++)
@@ -130,7 +138,7 @@ void process_ai_mesh(aiMesh* aiMesh, const aiScene* scene, glm::mat4 transform,
     mesh = {positions, uvs, normals, indices};
 }
 
-void process_ai_material(aiMaterial* aiMat, const aiScene* scene, Material& mat) {
+void process_ai_material(aiMaterial* aiMat, const aiScene* scene, Material& mat, const std::filesystem::path& modelDirectory) {
     aiString matName;
     aiReturn ret = aiMat->Get(AI_MATKEY_NAME, matName);
     if (ret != AI_SUCCESS) {
@@ -167,14 +175,8 @@ void process_ai_material(aiMaterial* aiMat, const aiScene* scene, Material& mat)
     }
 
     // now grab the textures, first diffuse
-    for (unsigned int i = 0; i < aiMat->GetTextureCount(aiTextureType_DIFFUSE); i++) {
-        aiString textureName;
-        aiMat->GetTexture(aiTextureType_DIFFUSE, i, &textureName);
-
-        if (!TextureLoader::textures.contains(textureName.C_Str())) {
-            TextureLoader::textures[textureName.C_Str()] = TextureLoader::load_from_file(textureName.C_Str());
-        }
-    }
+    process_ai_material_diffuse(aiMat, mat, modelDirectory);
+    process_ai_material_specular(aiMat, mat, modelDirectory);
 
     mat.name = matName.C_Str();
     mat.phong.ambient = glm::vec3{ambientColor.r, ambientColor.g, ambientColor.b};
@@ -182,3 +184,69 @@ void process_ai_material(aiMaterial* aiMat, const aiScene* scene, Material& mat)
     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) {
+    aiString aiTextureName;
+    aiMat->GetTexture(aiTextureType_DIFFUSE, 0, &aiTextureName);
+    std::string textureName = aiTextureName.C_Str();
+
+    if (textureName.empty()) {
+        mat.diffuse = TextureManager::textures["default_diffuse"];
+        return;
+    }
+
+    const auto textureFilename = std::filesystem::path(textureName).filename();
+    const auto texturePath = modelDirectory / textureFilename;
+
+    const std::string finalTextureName = textureFilename.string();
+    if (TextureManager::textures.contains(finalTextureName)) {
+        mat.diffuse = TextureManager::textures[finalTextureName];
+        return;
+    }
+
+    if (std::filesystem::exists(texturePath)) {
+        const auto texture = TextureManager::load_from_file(texturePath.string());
+        if (!texture) {
+            mat.diffuse = TextureManager::textures["default_diffuse"];
+            return;
+        }
+
+        TextureManager::textures[finalTextureName] = texture;
+        mat.diffuse = texture;
+    } else {
+        mat.diffuse = TextureManager::textures["default_diffuse"];
+    }
+}
+
+void process_ai_material_specular(const aiMaterial *aiMat, Material& mat, const std::filesystem::path& modelDirectory) {
+    aiString aiTextureName;
+    aiMat->GetTexture(aiTextureType_SPECULAR, 0, &aiTextureName);
+    std::string textureName = aiTextureName.C_Str();
+
+    if (textureName.empty()) {
+        mat.specular = TextureManager::textures["default_specular"];
+        return;
+    }
+
+    const auto textureFilename = std::filesystem::path(textureName).filename();
+    const auto texturePath = modelDirectory / textureFilename;
+
+    const std::string finalTextureName = textureFilename.string();
+    if (TextureManager::textures.contains(finalTextureName)) {
+        mat.specular = TextureManager::textures[finalTextureName];
+        return;
+    }
+
+    if (std::filesystem::exists(texturePath)) {
+        const auto texture = TextureManager::load_from_file(texturePath.string());
+        if (!texture) {
+            mat.specular = TextureManager::textures["default_specular"];
+            return;
+        }
+
+        TextureManager::textures[finalTextureName] = texture;
+        mat.specular = texture;
+    } else {
+        mat.specular = TextureManager::textures["default_specular"];
+    }
+}

src/ModelManager.h

@@ -10,7 +10,7 @@
 
 #include "Model.h"
 
-class ModelLoader
+class ModelManager
 {
 public:
     static std::unordered_map<std::string, std::shared_ptr<Model>> models;

src/Texture.h

@@ -16,6 +16,9 @@ public:
     Texture(unsigned int id, std::string_view filePath, int width, int height, int channels)
         : id(id), filePath(filePath), width(width), height(height), channels(channels) {}
 
+    Texture(const Texture&) = delete;
+    Texture& operator=(const Texture&) = delete;
+
     ~Texture() { glDeleteTextures(1, &id); }
 
     void bind() const {glBindTexture(GL_TEXTURE_2D, id);}

src/TextureManager.cpp

@@ -2,7 +2,7 @@
 // Created by slinky on 5/1/26.
 //
 
-#include "TextureLoader.h"
+#include "TextureManager.h"
 
 #include "stb_image.h"
 
@@ -10,9 +10,9 @@
 
 #include "glad/gl.h"
 
-std::unordered_map<std::string, std::shared_ptr<Texture>> TextureLoader::textures;
+std::unordered_map<std::string, std::shared_ptr<Texture>> TextureManager::textures;
 
-std::shared_ptr<Texture> TextureLoader::load_from_file(std::string_view filePath)
+std::shared_ptr<Texture> TextureManager::load_from_file(std::string_view filePath)
 {
     int width, height, channels;
     unsigned char *data = stbi_load(filePath.data(), &width, &height, &channels, 0);
@@ -41,7 +41,7 @@ std::shared_ptr<Texture> TextureLoader::load_from_file(std::string_view filePath
     return std::make_shared<Texture>(textureID, filePath, width, height, channels);
 }
 
-std::shared_ptr<Texture> TextureLoader::load_from_data(unsigned char* data, int width, int height, int channels)
+std::shared_ptr<Texture> TextureManager::load_from_data(unsigned char* data, int width, int height, int channels)
 {
     unsigned int textureID = 0;
     glGenTextures(1, &textureID);

src/TextureManager.h

@@ -2,15 +2,15 @@
 // Created by slinky on 5/1/26.
 //
 
-#ifndef B_ENGINE_TEXTURELOADER_H
-#define B_ENGINE_TEXTURELOADER_H
+#ifndef B_ENGINE_TEXTUREMANAGER_H
+#define B_ENGINE_TEXTUREMANAGER_H
 
 #include <memory>
 #include <unordered_map>
 
 #include "Texture.h"
 
-class TextureLoader {
+class TextureManager {
 public:
     static std::unordered_map<std::string, std::shared_ptr<Texture>> textures;
 
@@ -18,4 +18,4 @@ public:
     static std::shared_ptr<Texture> load_from_data(unsigned char* data, int width, int height, int channels);
 };
 
-#endif //B_ENGINE_TEXTURELOADER_H
+#endif //B_ENGINE_TEXTUREMANAGER_H

src/main.cpp

@@ -8,14 +8,16 @@
 #include "glm/ext/matrix_transform.hpp"
 
 #define STB_IMAGE_IMPLEMENTATION
+#include "FreeCamera.h"
+#include "InputManager.h"
 #include "stb_image.h"
 
 #include "Model.h"
-#include "ModelLoader.h"
+#include "ModelManager.h"
 #include "ShaderManager.h"
 #include "ShaderProgram.h"
 #include "Texture.h"
-#include "TextureLoader.h"
+#include "TextureManager.h"
 
 GLFWwindow* gWindow = nullptr;
 int gWindowWidth = 800;
@@ -24,9 +26,11 @@ int gWindowHeight = 600;
 int glVersionMajor = 0;
 int glVersionMinor = 0;
 
-auto cameraPosition = glm::vec3{0, 0, 0};
-auto view = glm::mat4{0};
-auto projection = glm::mat4{0};
+float gAspectRatio = 0.f;
+
+float gMouseSensitivity = 0.1f;
+
+FreeCamera gCamera {};
 
 void glfw_error_callback(int error, const char* description);
 void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
@@ -36,10 +40,16 @@ void init_glfw();
 void create_main_window();
 void load_gl();
 void init_camera();
+void load_default_textures();
+void load_shaders();
 void loop();
 
 std::shared_ptr<Model> load_model(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 start");
 
@@ -49,30 +59,33 @@ int main() {
 
     load_gl();
 
-    stbi_set_flip_vertically_on_load(true);
-
     init_camera();
 
-    // create a default texture
-    unsigned char defaultDiffuseData[4] = {static_cast<unsigned char>(255), 255, 255, 255};
-    TextureLoader::textures["default_diffuse"] = TextureLoader::load_from_data(reinterpret_cast<unsigned char*>(&defaultDiffuseData), 1, 1, 4);
+    stbi_set_flip_vertically_on_load(true);
 
-    // create a default specular map
-    unsigned char defaultSpecularData[4] = {static_cast<unsigned char>(128), 128, 128, 255};
-    TextureLoader::textures["default_specular"] = TextureLoader::load_from_data(reinterpret_cast<unsigned char*>(&defaultSpecularData), 1, 1, 4);
+    load_default_textures();
 
-    ShaderManager::shaders["phong_shader"] = ShaderManager::load("./resources/standard.vert", "./resources/standard.frag");
-    if (ShaderManager::shaders["phong_shader"] == nullptr)
-    {
-        std::exit(1);
-    }
+    load_shaders();
 
-    /*ModelLoader::models["cube"] = ModelLoader::load_from_file("./resources/cube.obj", true);*/
-    ModelLoader::models["backpack"] = ModelLoader::load_from_file("./resources/backpack/backpack.obj");
-    /*ModelLoader::models["male"] = ModelLoader::load_from_file("./resources/male.obj");*/
+    InputManager::generate_input_action("move_forward", {{GLFW_KEY_W, KEY_DOWN}});
+    InputManager::generate_input_action("move_backward", {{GLFW_KEY_S, KEY_DOWN}});
+    InputManager::generate_input_action("move_right", {{GLFW_KEY_D, KEY_DOWN}});
+    InputManager::generate_input_action("move_left", {{GLFW_KEY_A, KEY_DOWN}});
+
+    InputManager::generate_input_action("exit_application", {{GLFW_KEY_ESCAPE, KEY_DOWN}});
+
+    spdlog::info("loading models");
+    ModelManager::models["cube"] = ModelManager::load_from_file("./resources/cube.obj");
+    ModelManager::models["backpack"] = ModelManager::load_from_file("./resources/backpack/backpack.obj");
+    ModelManager::models["male"] = ModelManager::load_from_file("./resources/male.obj");
+    spdlog::info("done");
 
     loop();
 
+    ShaderManager::shaders.clear();
+    TextureManager::textures.clear();
+    ModelManager::models.clear();
+
     glfwDestroyWindow(gWindow);
     glfwTerminate();
 
@@ -83,14 +96,10 @@ void glfw_error_callback(int error, const char* description) {
     spdlog::error("glfw error: {}", description);
 }
 
-void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
-    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
-        glfwSetWindowShouldClose(window, GL_TRUE);
-    }
-}
-
 void glfw_framebuffer_size_callback(GLFWwindow *window, int width, int height) {
     glViewport(0, 0, width, height);
+    gAspectRatio = (float)width / (float)height;
+    gCamera.update_aspect_ratio(gAspectRatio);
 }
 
 void init_glfw()
@@ -103,13 +112,14 @@ void init_glfw()
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_SAMPLES, 4);
 
     glfwSetErrorCallback(glfw_error_callback);
 }
 
 void create_main_window()
 {
-    gWindow = glfwCreateWindow(gWindowWidth, gWindowHeight, "b_engine v0.0.1", nullptr, nullptr);
+    gWindow = glfwCreateWindow(gWindowWidth, gWindowHeight, "b_engine v0.0.2", nullptr, nullptr);
     if (!gWindow) {
         spdlog::error("failed to create glfw window");
         std::exit(1);
@@ -117,8 +127,12 @@ void create_main_window()
 
     glfwMakeContextCurrent(gWindow);
 
-    glfwSetKeyCallback(gWindow, glfw_key_callback);
+    glfwSetKeyCallback(gWindow, InputManager::key_callback);
+    glfwSetCursorPosCallback(gWindow, InputManager::mouse_pos_callback);
+
     glfwSetFramebufferSizeCallback(gWindow, glfw_framebuffer_size_callback);
+
+    glfwSetInputMode(gWindow, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 }
 
 void load_gl()
@@ -132,63 +146,131 @@ void load_gl()
     {
         int fbWidth, fbHeight;
         glfwGetFramebufferSize(gWindow, &fbWidth, &fbHeight);
-        glViewport(0, 0, fbWidth, fbHeight);
+        gAspectRatio = (float)fbWidth / (float)fbHeight;
     }
 
     glEnable(GL_DEPTH_TEST);
+    glEnable(GL_MULTISAMPLE);
 }
 
-void init_camera()
-{
-    cameraPosition = glm::vec3{10, 0, 10};
-    auto cameraTarget = glm::vec3{0, 0, 0};
+void init_camera() {
+    gCamera = {{5.f, 5.f, 5.f}, 0, 0, gAspectRatio};
+    gCamera.rotate_yaw(-135.f);
+    gCamera.rotate_pitch(-35.f);
 
-    view = glm::lookAt(cameraPosition, cameraTarget, glm::vec3(0.0f, 1.0f, 0.0f));
+    InputManager::add_mouse_listener([](float xoff, float yoff) {
+        gCamera.rotate_yaw(xoff * gMouseSensitivity);
+        gCamera.rotate_pitch(yoff * gMouseSensitivity);
+    });
+}
 
-    float aspectRatio = static_cast<float>(gWindowWidth) / static_cast<float>(gWindowHeight);
-    projection = glm::perspective(glm::radians(75.f), aspectRatio, 0.1f, 100.0f);
+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 loop() {
-    Texture* defaultDiffuse = TextureLoader::textures["default_diffuse"].get();
-    Texture* defaultSpecular = TextureLoader::textures["default_specular"].get();
+    std::shared_ptr<Texture> defaultDiffuse = TextureManager::textures["default_diffuse"];
+    std::shared_ptr<Texture> defaultSpecular = TextureManager::textures["default_specular"];
 
-    while (!glfwWindowShouldClose(gWindow)) {
     auto model = glm::identity<glm::mat4>();
-        // model = glm::translate(model, glm::vec3(0, -5.f, 0));
-        // model = glm::scale(model, glm::vec3(.5f, .5f, .5f));
-        glfwPollEvents();
-
-        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
-        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
     ShaderProgram* shader = ShaderManager::shaders["phong_shader"].get();
 
-        const Model* cube = ModelLoader::models["cube"].get();
-        const Model* backpack = ModelLoader::models["backpack"].get();
-        const Model* male = ModelLoader::models["male"].get();
+    const auto cube = ModelManager::models["cube"];
+    const auto backpack = ModelManager::models["backpack"];
+    const auto male = ModelManager::models["male"];
 
-        if (shader) {
-            Material* mat = backpack->materials[0].get();
+    const auto& activeModel = backpack;
+
+    while (!glfwWindowShouldClose(gWindow)) {
+        glfwPollEvents();
+
+        // check inputs
+        if (InputManager::check_action_performed("exit_application")) {
+            glfwSetWindowShouldClose(gWindow, true);
+            continue;
+        }
+
+        if (InputManager::check_action_performed("move_forward")) {
+            gCamera.move(CAMERA_MOVEMENT::FORWARD, .05);
+        }
+
+        if (InputManager::check_action_performed("move_backward")) {
+            gCamera.move(CAMERA_MOVEMENT::BACKWARD, .05);
+        }
+
+        if (InputManager::check_action_performed("move_left")) {
+            gCamera.move(CAMERA_MOVEMENT::LEFT, .05);
+        }
+
+        if (InputManager::check_action_performed("move_right")) {
+            gCamera.move(CAMERA_MOVEMENT::RIGHT, .05);
+        }
+
+        // gl frame prep
+        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        // draw the stuff
+        if (shader && activeModel) {
             shader->bind();
 
-            shader->setMat4("projection", projection);
-            shader->setMat4("view", view);
+            shader->setMat4("projection", gCamera.projection());
+            shader->setMat4("view", gCamera.view());
             shader->setMat4("model", model);
 
-            shader->setVec3("viewPosition", cameraPosition);
+            shader->setVec3("viewPosition", gCamera.position());
 
-            shader->setVec3("phongAmbient",  glm::vec3(0.3f, 0.3f, 0.3f));
-            shader->setVec3("phongDiffuse",  glm::vec3(0.8f, 0.8f, 0.8f));
-            shader->setVec3("phongSpecular", glm::vec3(1.0f, 1.0f, 1.0f));
-            shader->setFloat("phongShininess", 32.0f);
-
-            shader->setVec3("lightDirection", glm::vec3(-.5f, -.5f, -.5f));
+            shader->setVec3("lightPosition", glm::vec3{-2.f, 0, 2.0f});
+            shader->setVec3("lightDirection", glm::vec3(1, -1, -1));
             shader->setVec3("lightAmbient",   glm::vec3(0.3f, 0.3f, 0.3f));
-            shader->setVec3("lightDiffuse",   glm::vec3(1.0f, 1.0f, 1.0f));
+            shader->setVec3("lightDiffuse",   glm::vec3(0.5f, 0.5f, 0.5f));
             shader->setVec3("lightSpecular",  glm::vec3(1.0f, 1.0f, 1.0f));
 
-            for (const auto& mesh: backpack->meshes) {
+            for (const auto& mesh: activeModel->meshes) {
+                unsigned int materialId = mesh->materialId;
+                if (materialId >= activeModel->materials.size()) {
+                    materialId = 0;
+                }
+
+                const std::shared_ptr<Material> mat = activeModel->materials[1];
+
+                shader->setVec3("phongAmbient",  mat->phong.ambient);
+                shader->setVec3("phongDiffuse",  mat->phong.diffuse);
+                shader->setVec3("phongSpecular", mat->phong.specular);
+                shader->setFloat("phongShininess", mat->phong.shininess);
+
+                glActiveTexture(GL_TEXTURE0);
+                auto diffuse = mat->diffuse;
+                if (!diffuse) {
+                    diffuse = defaultDiffuse;
+                }
+                diffuse->bind();
+                shader->setInt("diffuseMap", 0);
+
+                glActiveTexture(GL_TEXTURE1);
+                auto specular = mat->specular;
+                if (!specular) {
+                    specular = defaultSpecular;
+                }
+                specular->bind();
+                shader->setInt("specularMap", 1);
+
                 glBindVertexArray(mesh.get()->vao);
                 glDrawElements(GL_TRIANGLES, mesh->numIndices, GL_UNSIGNED_INT, 0);
             }
@@ -197,6 +279,7 @@ void loop() {
             ShaderProgram::unbind();
         }
 
+        // gl end frame stuff
         glfwSwapBuffers(gWindow);
     }
 }