initial commit

.gitignore

@@ -0,0 +1,2 @@
+cmake-build-*
+.idea

.gitmodules

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+[submodule "_ThirdParty/spdlog"]
+	path = _ThirdParty/spdlog
+	url = https://github.com/gabime/spdlog.git
+[submodule "_ThirdParty/glfw"]
+	path = _ThirdParty/glfw
+	url = https://github.com/glfw/glfw.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 4.1)
+project(b_engine VERSION 0.0.1 LANGUAGES CXX C)
+
+set(CMAKE_CXX_STANDARD 20)
+
+set (GLAD_SOURCE_DIR _ThirdParty/glad/src)
+set (GLAD_INCLUDE_DIR _ThirdParty/glad/include)
+
+include_directories(${GLAD_INCLUDE_DIR})
+
+set (GLFW_BUILD_EXAMPLES FALSE)
+set (GLFW_BUILD_TESTS FALSE)
+set (GLFW_BUILD_DOCS FALSE)
+add_subdirectory(_ThirdParty/glfw)
+
+add_subdirectory(_ThirdParty/spdlog)
+
+add_executable(${PROJECT_NAME} src/main.cpp ${GLAD_SOURCE_DIR}/gl.c
+        src/Mesh.cpp
+        src/Mesh.h)
+target_link_libraries(${PROJECT_NAME} glfw spdlog)

_ThirdParty/glad/include/KHR/khrplatform.h

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+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are 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 Materials.
+**
+** THE MATERIALS ARE 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
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+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;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

src/Mesh.cpp

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+//
+// Created by slinky on 4/26/26.
+//
+#include "Mesh.h"
+
+Mesh::Mesh(const std::vector<float> &positions, const std::vector<float> &uvs, const std::vector<float> &normals, const std::vector<int> &indices) {
+    vao = 0;
+    glGenVertexArrays(1, &vao);
+    glBindVertexArray(vao);
+
+    // positions
+    GLuint positionVbo = 0;
+    glGenBuffers(1, &positionVbo);
+    glBindBuffer(GL_ARRAY_BUFFER, positionVbo);
+    glBufferData(GL_ARRAY_BUFFER, positions.size() * sizeof(float), positions.data(), GL_STATIC_DRAW);
+
+    // uvs
+    GLuint uvVbo = 0;
+    glGenBuffers(1, &uvVbo);
+    glBindBuffer(GL_ARRAY_BUFFER, uvVbo);
+    glBufferData(GL_ARRAY_BUFFER, uvs.size() * sizeof(float), uvs.data(), GL_STATIC_DRAW);
+
+    // normals
+    GLuint normalVbo = 0;
+    glGenBuffers(1, &normalVbo);
+    glBindBuffer(GL_ARRAY_BUFFER, normalVbo);
+    glBufferData(GL_ARRAY_BUFFER, normals.size() * sizeof(float), normals.data(), GL_STATIC_DRAW);
+}

src/Mesh.h

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+//
+// Created by slinky on 4/26/26.
+//
+
+#ifndef B_ENGINE_MESH_H
+#define B_ENGINE_MESH_H
+
+#include <vector>
+
+#include "glad/gl.h"
+
+class Mesh {
+public:
+    Mesh() = default;
+
+    Mesh(const std::vector<float>& positions,
+        const std::vector<float>& uvs,
+        const std::vector<float>& normals,
+        const std::vector<float>& indices);
+
+    void bind();
+private:
+    GLuint vao;
+};
+
+#endif //B_ENGINE_MESH_H

src/main.cpp

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+#include <iostream>
+
+#include "glad/gl.h"
+#include "GLFW/glfw3.h"
+
+#include "spdlog/spdlog.h"
+
+GLFWwindow* gWindow;
+int gWindowWidth = 800;
+int gWindowHeight = 600;
+
+int glVersionMajor;
+int glVersionMinor;
+
+void glfw_error_callback(int error, const char* description);
+void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
+void glfw_framebuffer_size_callback(GLFWwindow* window, int width, int height);
+
+int main() {
+    spdlog::info("b_engine start");
+
+    if (!glfwInit()) {
+        spdlog::error("could not initialize glfw");
+        std::exit(1);
+    }
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+    glfwSetErrorCallback(glfw_error_callback);
+
+    gWindow = glfwCreateWindow(gWindowWidth, gWindowHeight, "b_engine v0.0.1", nullptr, nullptr);
+    if (!gWindow) {
+        spdlog::error("failed to create glfw window");
+        std::exit(1);
+    }
+
+    glfwMakeContextCurrent(gWindow);
+
+    glfwSetKeyCallback(gWindow, glfw_key_callback);
+    glfwSetFramebufferSizeCallback(gWindow, glfw_framebuffer_size_callback);
+
+    int version = gladLoadGL(glfwGetProcAddress);
+    glVersionMajor = GLAD_VERSION_MAJOR(version);
+    glVersionMinor = GLAD_VERSION_MINOR(version);
+    spdlog::info("gl version {}.{}", glVersionMajor, glVersionMinor);
+
+    int fbWidth, fbHeight;
+    glfwGetFramebufferSize(gWindow, &fbWidth, &fbHeight);
+    glViewport(0, 0, fbWidth, fbHeight);
+
+    while (!glfwWindowShouldClose(gWindow)) {
+        glfwPollEvents();
+
+        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        glfwSwapBuffers(gWindow);
+    }
+
+    glfwDestroyWindow(gWindow);
+    glfwTerminate();
+
+    return 0;
+}
+
+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);
+}