Initial commit

.gitignore

@@ -0,0 +1,23 @@
+# CMake build directories
+build/
+cmake-build-*/
+out/
+.cache/
+
+# CMake generated files
+CMakeFiles/
+CMakeCache.txt
+cmake_install.cmake
+Makefile
+*.vcxproj*
+*.sln
+
+# IDE specific files
+.idea/
+.vscode/
+*.user
+
+# Other temporary files
+*.log
+*.tmp
+*.swp

CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.19)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+if(WIN32)
+    list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/cmake)
+endif()
+
+project(Main)
+file(GLOB SOURCES src/*.h src/*.cpp src/*.c)
+add_executable(Main ${SOURCES})
+
+find_package(glfw3 3.4 REQUIRED)
+find_package(OpenGL REQUIRED)
+
+if(UNIX)
+    set(GLFW3_LIBRARY glfw)
+endif()
+
+include_directories(${GLFW3_INCLUDE_DIR})
+target_include_directories(Main PUBLIC include src)
+target_link_libraries(Main ${GLFW3_LIBRARY} OpenGL::GL)

compile

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+RUN_AFTER_BUILD=0
+CMAKE_ARGS=""
+BINARY_NAME="Main"
+
+for arg in "$@"; do
+  case "$arg" in
+    --clean)
+      echo "Cleaning build directory..."
+      rm -rf build/*
+      ;;
+    --debug)
+      echo "Enabling debug build..."
+      CMAKE_ARGS="-DCMAKE_BUILD_TYPE=Debug"
+      ;;
+    --run)
+      RUN_AFTER_BUILD=1
+      ;;
+    *)
+      echo "Unknown argument: $arg"
+      echo "Usage: $0 [--clean] [--debug] [--run]"
+      exit 1
+      ;;
+  esac
+done
+
+mkdir -p build
+
+(
+  cd build || exit 1
+  cmake .. $CMAKE_ARGS
+  make
+)
+
+if [ "$RUN_AFTER_BUILD" -eq 1 ]; then
+  if [ -x "build/$BINARY_NAME" ]; then
+    echo "Running ./$BINARY_NAME..."
+    "./build/$BINARY_NAME"
+  else
+    echo "Error: Binary 'build/$BINARY_NAME' not found or not executable."
+    exit 1
+  fi
+fi

include/KHR/khrplatform.h

@@ -0,0 +1,311 @@
+#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_ */

shaders/basic.frag

@@ -0,0 +1,12 @@
+#version 460 core
+
+layout (location = 0) in vec4 tex_color;
+layout (location = 1) in vec2 tex_coord;
+
+out vec4 frag_color;
+
+uniform sampler2D tex;
+
+void main() {
+    frag_color = texture(tex, tex_coord) * tex_color;
+}

shaders/basic.vert

@@ -0,0 +1,15 @@
+#version 460 core
+
+layout (location = 0) in vec3 a_pos;
+layout (location = 1) in vec3 a_color;
+layout (location = 2) in vec2 a_tex_coord;
+
+layout (location = 0) out vec4 tex_color;
+layout (location = 1) out vec2 tex_coord;
+
+void main() {
+    gl_Position = vec4(a_pos, 1.0);
+    tex_color = vec4(a_color, 1.0);
+    tex_coord = a_tex_coord;
+}
+

src/basic.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <string>
+#include <glm/glm.hpp>
+
+typedef unsigned char      u8;
+typedef unsigned short     u16;
+typedef unsigned int       u32;
+typedef unsigned long long u64;
+
+typedef char      s8;
+typedef short     s16;
+typedef int       s32;
+typedef long long s64;
+
+typedef s32 b32;
+
+typedef float  f32;
+typedef double f64;
+
+typedef std::string string;
+
+#define array_count(array) (sizeof(array) / sizeof((array)[0]))
+
+using Vector2 = glm::vec2;
+using Vector3 = glm::vec3;
+using Matrix4 = glm::mat4;
+

src/file.cpp

@@ -0,0 +1,28 @@
+#include "file.h"
+
+string load_file_to_string(string filepath) {
+  std::ifstream in_file(filepath);
+  string str;
+
+  if (in_file.is_open()) {
+    in_file.seekg(0, std::ios::end);
+    str.reserve(in_file.tellg());
+    in_file.seekg(0, std::ios::beg);
+
+    str.assign((std::istreambuf_iterator<char>(in_file)),
+                std::istreambuf_iterator<char>());
+    in_file.close();
+  } else {
+    return "";
+  }
+
+  if (in_file.bad() || in_file.fail()) {
+    in_file.close();
+    return "";
+  }
+
+  in_file.close();
+
+  return str;
+}
+

src/file.h

@@ -0,0 +1,5 @@
+#pragma once
+#include "basic.h"
+#include <fstream>
+
+string load_file_to_string(string filepath);

src/logger.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "basic.h"
+#include <cstdio>
+
+template <typename... Args>
+void log(u32 log_level, Args ... args) {
+    if (log_level <= 9) {
+        std::printf(args ...);
+        std::fflush(stdout);
+    }
+}

src/main.cpp

@@ -0,0 +1,16 @@
+#include "window.h"
+#include "logger.h"
+
+int main(int argc, char *argv[]) {
+    Window window;
+
+    if (!init(&window, 640, 480, "OpenGL Renderer")) {
+        log(1, "%s error: Window init error\n", __FUNCTION__);
+        return -1;
+    }
+
+    main_loop(&window);
+    cleanup(&window);
+
+    return 0;
+}

src/model.cpp

@@ -0,0 +1,26 @@
+#include "model.h"
+
+void init_model(Model *model) {
+  model->vertex_data.vertices.resize(6);
+
+  model->vertex_data.vertices[0].position = Vector3(-0.5f, -0.5f, 0.5f);
+  model->vertex_data.vertices[1].position = Vector3(0.5f, 0.5f, 0.5f);
+  model->vertex_data.vertices[2].position = Vector3(-0.5f, 0.5f, 0.5f);
+  model->vertex_data.vertices[3].position = Vector3(-0.5f, -0.5f, 0.5f);
+  model->vertex_data.vertices[4].position = Vector3(0.5f, -0.5f, 0.5f);
+  model->vertex_data.vertices[5].position = Vector3(0.5f, 0.5f, 0.5f);
+
+  model->vertex_data.vertices[0].color = Vector3(0.0f, 0.0f, 1.0f);
+  model->vertex_data.vertices[1].color = Vector3(0.0f, 1.0f, 1.0f);
+  model->vertex_data.vertices[2].color = Vector3(1.0f, 1.0f, 0.0f);
+  model->vertex_data.vertices[3].color = Vector3(1.0f, 0.0f, 1.0f);
+  model->vertex_data.vertices[4].color = Vector3(0.0f, 1.0f, 0.0f);
+  model->vertex_data.vertices[5].color = Vector3(1.0f, 1.0f, 1.0f);
+
+  model->vertex_data.vertices[0].uv = Vector2(0.0, 0.0);
+  model->vertex_data.vertices[1].uv = Vector2(1.0, 1.0);
+  model->vertex_data.vertices[2].uv = Vector2(0.0, 1.0);
+  model->vertex_data.vertices[3].uv = Vector2(0.0, 0.0);
+  model->vertex_data.vertices[4].uv = Vector2(1.0, 0.0);
+  model->vertex_data.vertices[5].uv = Vector2(1.0, 1.0);
+}

src/model.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <vector>
+#include "basic.h"
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include "renderer.h"
+
+struct Model {
+  Mesh vertex_data;
+};
+
+void init_model(Model *model);

src/renderer.cpp

@@ -0,0 +1,337 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "renderer.h"
+
+
+bool init_renderer(Renderer *renderer, u32 width, u32 height) {
+  if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
+    log(1, "%s error: failed to initialize GLAD\n", __FUNCTION__);
+    return false;
+  }
+
+  if (!GLAD_GL_VERSION_4_6) {
+    log(1, "%s error: failed to get at least OpenGL 4.6\n", __FUNCTION__);
+    return false;
+  }
+
+  {
+    bool success = init_frame_buffer(&renderer->frame_buffer, width, height);
+    if (!success) {
+      log(1, "%s error: could not init Framebuffer\n", __FUNCTION__);
+      return false;
+    }
+    log(1, "%s: framebuffer succesfully initialized\n", __FUNCTION__);
+  }
+
+  {
+    bool success = load_texture(&renderer->texture, "assets/textures/crate.png");
+    if (!success) {
+      log(1, "%s: texture loading failed\n", __FUNCTION__);
+      return false;
+    }
+    log(1, "%s: texture successfully loaded\n", __FUNCTION__);
+  }
+
+  {
+    bool success = init_vertex_buffer(&renderer->vertex_buffer);
+    if (!success) {
+      log(1, "%s: vertex buffer successfully created\n", __FUNCTION__);
+      return false;
+    }
+  }
+
+  {
+    bool success = load_shaders(&renderer->shader, "shaders/basic.vert", "shaders/basic.frag");
+    if (!success) {
+      log(1, "%s: shader loading failed\n", __FUNCTION__);
+      return false;
+    }
+    log(1, "%s: shaders succesfully loaded\n", __FUNCTION__);
+  }
+
+  return true;
+}
+
+void set_renderer_size(Renderer *renderer, u32 width, u32 height) {
+  resize_frame_buffer(&renderer->frame_buffer, width, height);
+  glViewport(0, 0, width, height);
+}
+
+void draw_renderer(Renderer *renderer) {
+  bind_frame_buffer(&renderer->frame_buffer);
+
+  glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+  glClearDepth(1.0f);
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  glEnable(GL_CULL_FACE);
+  glEnable(GL_DEPTH_TEST);
+
+  use_shader(&renderer->shader);
+
+  bind_texture(&renderer->texture);
+
+  bind_vertex_buffer(&renderer->vertex_buffer);
+
+
+  draw_vertex_buffer(GL_TRIANGLES, 0, renderer->triangle_count * 3);
+
+  unbind_vertex_buffer();
+  unbind_texture();
+  unbind_frame_buffer(&renderer->frame_buffer);
+
+  draw_frame_buffer(&renderer->frame_buffer);
+}
+
+void upload_renderer_data(Renderer *renderer, Mesh *vertex_data) {
+  renderer->triangle_count = vertex_data->vertices.size() / 3;
+  upload_vertex_buffer_data(&renderer->vertex_buffer, vertex_data);
+}
+
+void cleanup_renderer(Renderer *renderer) {
+  cleanup_shader(&renderer->shader);
+  cleanup_texture(&renderer->texture);
+  cleanup_vertex_buffer(&renderer->vertex_buffer);
+  cleanup_frame_buffer(&renderer->frame_buffer);
+}
+
+
+/*
+ * Frame buffer
+ */
+bool init_frame_buffer(Frame_Buffer *frame_buffer, u32 width, u32 height) {
+  frame_buffer->width = width;
+  frame_buffer->height = height;
+
+  glGenFramebuffers(1, &frame_buffer->buffer);
+  glBindFramebuffer(GL_FRAMEBUFFER, frame_buffer->buffer);
+  glEnable(GL_FRAMEBUFFER_SRGB);
+
+  glGenTextures(1, &frame_buffer->color_tex);
+  glBindTexture(GL_TEXTURE_2D, frame_buffer->color_tex);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glBindTexture(GL_TEXTURE_2D, 0);
+
+  glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, frame_buffer->color_tex, 0);
+  log(1, "%s: added color buffer\n", __FUNCTION__);
+
+  glGenRenderbuffers(1, &frame_buffer->depth_buffer);
+  glBindRenderbuffer(GL_RENDERBUFFER, frame_buffer->depth_buffer);
+  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
+  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, frame_buffer->depth_buffer);
+  glBindRenderbuffer(GL_RENDERBUFFER, 0);
+  log(1, "%s: added depth render buffer\n", __FUNCTION__);
+
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+  return check_frame_buffer_complete(frame_buffer);
+}
+
+bool check_frame_buffer_complete(Frame_Buffer *frame_buffer) {
+  glBindFramebuffer(GL_FRAMEBUFFER, frame_buffer->buffer);
+
+  GLenum result = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+  if (result != GL_FRAMEBUFFER_COMPLETE) {
+    log(1, "%s error: framebuffer is NOT complete\n", __FUNCTION__);
+    return false;
+  }
+
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    log(1, "%s: framebuffer is complete\n", __FUNCTION__);
+  return true;
+}
+
+bool resize_frame_buffer(Frame_Buffer *frame_buffer, u32 width, u32 height) {
+  frame_buffer->width = width;
+  frame_buffer->height = height;
+
+  glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+  glDeleteTextures(1, &frame_buffer->color_tex);
+  glDeleteRenderbuffers(1, &frame_buffer->depth_buffer);
+  glDeleteFramebuffers(1, &frame_buffer->buffer);
+
+  return init_frame_buffer(frame_buffer, width, height);
+}
+
+void draw_frame_buffer(Frame_Buffer *frame_buffer) {
+  glBindFramebuffer(GL_READ_FRAMEBUFFER, frame_buffer->buffer);
+  glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+  glBlitFramebuffer(0, 0, frame_buffer->width, frame_buffer->height, 0, 0, frame_buffer->width, frame_buffer->height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
+  glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+}
+
+void bind_frame_buffer(Frame_Buffer *frame_buffer) {
+  glBindFramebuffer(GL_DRAW_FRAMEBUFFER, frame_buffer->buffer);
+}
+
+void unbind_frame_buffer(Frame_Buffer *frame_buffer) {
+  glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+}
+
+void cleanup_frame_buffer(Frame_Buffer *frame_buffer) {
+  unbind_frame_buffer(frame_buffer);
+
+  glDeleteTextures(1, &frame_buffer->color_tex);
+  glDeleteRenderbuffers(1, &frame_buffer->depth_buffer);
+  glDeleteFramebuffers(1, &frame_buffer->buffer);
+}
+
+
+/*
+ * Vertex buffer
+ */
+bool init_vertex_buffer(Vertex_Buffer *vertex_buffer) {
+  glGenVertexArrays(1, &vertex_buffer->vao);
+  glGenBuffers(1, &vertex_buffer->vbo);
+
+  glBindVertexArray(vertex_buffer->vao);
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer->vbo);
+
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*) offsetof(Vertex, position));
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*) offsetof(Vertex, color));
+  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*) offsetof(Vertex, uv));
+  
+  glEnableVertexAttribArray(0);
+  glEnableVertexAttribArray(1);
+  glEnableVertexAttribArray(2);
+
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+  glBindVertexArray(0);
+
+  return true;
+}
+
+void cleanup_vertex_buffer(Vertex_Buffer *vertex_buffer) {
+  glDeleteBuffers(1, &vertex_buffer->vbo);
+  glDeleteVertexArrays(1, &vertex_buffer->vao);
+}
+
+void upload_vertex_buffer_data(Vertex_Buffer *vertex_buffer, Mesh *vertex_data) {
+  glBindVertexArray(vertex_buffer->vao);
+  glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer->vbo);
+  glBufferData(GL_ARRAY_BUFFER, vertex_data->vertices.size() * sizeof(Vertex), &vertex_data->vertices.at(0), GL_DYNAMIC_DRAW);
+
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+  glBindVertexArray(0);
+}
+
+void bind_vertex_buffer(Vertex_Buffer *vertex_buffer) {
+  glBindVertexArray(vertex_buffer->vao);
+}
+
+void unbind_vertex_buffer() {
+  glBindVertexArray(0);
+}
+
+void draw_vertex_buffer(u32 mode, u32 start, u32 num) {
+  glDrawArrays(mode, start, num);
+}
+
+
+/*
+ * Texture
+ */
+bool load_texture(Texture *texture, string filepath) {
+  texture->name = filepath;
+
+  stbi_set_flip_vertically_on_load(true);
+  u8* texture_data = stbi_load(filepath.c_str(), &texture->width, &texture->height, &texture->number_of_channels, 0);
+
+  if (!texture_data) {
+    stbi_image_free(texture_data);
+    return false;
+  }
+
+  glGenTextures(1, &texture->texture);
+  glBindTexture(GL_TEXTURE_2D, texture->texture);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture->width, texture->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture_data);
+
+  glGenerateMipmap(GL_TEXTURE_2D);
+  glBindTexture(GL_TEXTURE_2D, 0);
+
+  stbi_image_free(texture_data);
+
+  return true;
+}
+
+void bind_texture(Texture *texture) {
+  glBindTexture(GL_TEXTURE_2D, texture->texture);
+}
+
+void unbind_texture() {
+  glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void cleanup_texture(Texture *texture) {
+  glDeleteTextures(1, &texture->texture);
+}
+
+
+/*
+ * Shaders
+ */
+bool load_shaders(Shader *shader, string vertex_shader_filepath, string fragment_shader_filepath) {
+  u32 vertex_shader = load_shader(vertex_shader_filepath, GL_VERTEX_SHADER);
+  if (!vertex_shader) {
+    return false;
+  }
+
+  u32 fragment_shader = load_shader(fragment_shader_filepath, GL_FRAGMENT_SHADER);
+  if (!fragment_shader) {
+    return false;
+  }
+
+  shader->program = glCreateProgram();
+  glAttachShader(shader->program, vertex_shader);
+  glAttachShader(shader->program, fragment_shader);
+  glLinkProgram(shader->program);
+
+  s32 is_program_linked;
+  glGetProgramiv(shader->program, GL_LINK_STATUS, &is_program_linked);
+  if (!is_program_linked) {
+    glDeleteShader(vertex_shader);
+    glDeleteShader(fragment_shader);
+    return false;
+  }
+
+  glDeleteShader(vertex_shader);
+  glDeleteShader(fragment_shader);
+
+  return true;
+}
+
+void cleanup_shader(Shader *shader) {
+  glDeleteProgram(shader->program);
+}
+
+u32 load_shader(string filepath, u32 shader_type) {
+  string shader_as_text; 
+  shader_as_text = load_file_to_string(filepath);
+
+  const char*shader_source = shader_as_text.c_str();
+  u32 shader = glCreateShader(shader_type);
+  glShaderSource(shader, 1, (const GLchar**) &shader_source, 0);
+  glCompileShader(shader);
+
+  s32 is_shader_compiled;
+  glGetShaderiv(shader, GL_COMPILE_STATUS, &is_shader_compiled);
+  if (!is_shader_compiled) {
+    return 0;
+  }
+
+  return shader;
+}
+
+void use_shader(Shader *shader) {
+  glUseProgram(shader->program);
+}

src/renderer.h

@@ -0,0 +1,87 @@
+#pragma once
+
+#include <vector>
+#include "logger.h"
+#include "basic.h"
+#include "file.h"
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <stb_image.h>
+
+
+struct Vertex {
+  Vector3 position;
+  Vector3 color;
+  Vector2 uv;
+};
+
+struct Mesh {
+  std::vector<Vertex> vertices;
+};
+
+struct Frame_Buffer {
+  u32 width = 640;
+  u32 height = 480;
+  u32 buffer = 0;
+  u32 color_tex = 0;
+  u32 depth_buffer = 0;
+};
+
+struct Vertex_Buffer {
+  u32 vao = 0;
+  u32 vbo = 0;
+};
+
+struct Texture {
+  u32 texture = 0;
+  s32 width = 0;
+  s32 height = 0;
+  s32 number_of_channels = 0;
+  string name;
+};
+
+struct Shader {
+  u32 program = 0;
+};
+
+
+struct Renderer {
+  Shader shader;
+  Frame_Buffer frame_buffer;
+  Vertex_Buffer vertex_buffer;
+  Texture texture;
+  Mesh mesh;
+  s32 triangle_count = 0;
+};
+
+
+bool init_renderer(Renderer *renderer, u32 width, u32 height);
+void set_renderer_size(Renderer *renderer, u32 width, u32 height);
+void draw_renderer(Renderer *renderer);
+void upload_renderer_data(Renderer *renderer, Mesh *vertex_data);
+void cleanup_renderer(Renderer *renderer);
+
+bool init_frame_buffer(Frame_Buffer *frame_buffer, u32 width, u32 height);
+bool resize_frame_buffer(Frame_Buffer *frame_buffer, u32 width, u32 height);
+bool check_frame_buffer_complete(Frame_Buffer *frame_buffer);
+void bind_frame_buffer(Frame_Buffer *frame_buffer);
+void unbind_frame_buffer(Frame_Buffer *frame_buffer);
+void draw_frame_buffer(Frame_Buffer *frame_buffer);
+void cleanup_frame_buffer(Frame_Buffer *frame_buffer);
+
+bool init_vertex_buffer(Vertex_Buffer *vertex_buffer);
+void cleanup_vertex_buffer(Vertex_Buffer *vertex_buffer);
+void upload_vertex_buffer_data(Vertex_Buffer *vertex_buffer, Mesh *vertex_data);
+void bind_vertex_buffer(Vertex_Buffer *vertex_buffer);
+void unbind_vertex_buffer();
+void draw_vertex_buffer(u32 mode, u32 start, u32 num);
+
+bool load_texture(Texture *texture, string filepath);
+void bind_texture(Texture *texture);
+void unbind_texture();
+void cleanup_texture(Texture *texture);
+
+bool load_shaders(Shader *shader, string vertex_shader_filepath, string fragment_shader_filepath);
+u32 load_shader(string filepath, u32 shader_type);
+void use_shader(Shader *shader);
+void cleanup_shader(Shader *shader);

src/window.cpp

@@ -0,0 +1,153 @@
+#include "window.h"
+#include "logger.h"
+
+bool init(Window *window, u32 width, u32 height, string title) {
+  glfwInitHint(GLFW_PLATFORM, GLFW_PLATFORM_WAYLAND);
+
+  if (!glfwInit()) {
+    log(1, "%s: glfwInit() error\n", __FUNCTION__);
+    glfwTerminate();
+    return false;
+  }
+
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+
+  window->glfw_window = glfwCreateWindow(width, height, title.c_str(), nullptr, nullptr);
+
+  if (!window->glfw_window) {
+    log(1, "%s: Could not create window\n", __FUNCTION__);
+    const char *desc;
+    int code = glfwGetError(&desc);
+    log(1, "GLFW error code: %d, description: %s\n", code,
+           desc ? desc : "No description given");
+    glfwTerminate();
+    return false;
+  }
+
+  glfwMakeContextCurrent(window->glfw_window);
+
+  window->renderer = new Renderer();
+  bool success = init_renderer(window->renderer, width, height);
+  if (!success) {
+    log(1, "%s: could not initialize renderer\n", __FUNCTION__);
+    glfwTerminate();
+    return false;
+  }
+
+  log(1, "%s: Renderer initialized\n", __FUNCTION__);
+
+  glfwSetWindowUserPointer(window->glfw_window, window);
+
+  glfwSetWindowSizeCallback(window->glfw_window, handle_window_resize_events);
+  glfwSetWindowCloseCallback(window->glfw_window, handle_close);
+  glfwSetKeyCallback(window->glfw_window, handle_key_events);
+  glfwSetCursorPosCallback(window->glfw_window, handle_mouse_position_events);
+  glfwSetMouseButtonCallback(window->glfw_window, handle_mouse_button_events);
+
+  window->model = new Model();
+  init_model(window->model);
+
+  log(1, "%s: Window initialized\n", __FUNCTION__);
+  return true;
+}
+
+void main_loop(Window *window) {
+  glfwSwapInterval(1);
+  upload_renderer_data(window->renderer, &window->model->vertex_data);
+
+  while (!glfwWindowShouldClose(window->glfw_window)) {
+    draw_renderer(window->renderer);
+
+    glfwSwapBuffers(window->glfw_window);
+    glfwPollEvents();
+  }
+}
+
+void cleanup(Window *window) {
+  log(1, "%s: Terminating Window\n", __FUNCTION__);
+  delete window->renderer;
+  delete window->model;
+  glfwDestroyWindow(window->glfw_window);
+  glfwTerminate();
+}
+
+void handle_close(GLFWwindow *gl_window) {
+  Window *window = static_cast<Window *>(glfwGetWindowUserPointer(gl_window));
+  log(1, "%s: Window got close event... bye!\n", __FUNCTION__);
+}
+
+void handle_key_events(GLFWwindow *gl_window, s32 key, s32 scancode, s32 action, s32 mods) {
+  Window *window = static_cast<Window *>(glfwGetWindowUserPointer(gl_window));
+
+  string action_name;
+
+  switch(action) {
+    case GLFW_PRESS:
+      action_name = "pressed";
+      break;
+    case GLFW_RELEASE:
+      action_name = "released";
+      break;
+    case GLFW_REPEAT:
+      action_name = "repeated";
+      break;
+    default:
+      action_name = "invalid";
+      break;
+  }
+
+  const char *key_name = glfwGetKeyName(key, 0);
+  log(1, "%s: key %s (key %i, scancode %i) %s\n", __FUNCTION__, key_name, key, scancode, action_name.c_str());
+}
+
+void handle_mouse_position_events(GLFWwindow *gl_window, f64 x_pos, f64 y_pos) {
+  Window *window = static_cast<Window *>(glfwGetWindowUserPointer(gl_window));
+  log(1, "%s: Mouse is at position %lf/%lf\n", __FUNCTION__, x_pos, y_pos);
+}
+
+void handle_mouse_button_events(GLFWwindow *gl_window, s32 button, s32 action, s32 mods) {
+  Window *window = static_cast<Window *>(glfwGetWindowUserPointer(gl_window));
+
+  string action_name;
+  switch(action) {
+    case GLFW_PRESS:
+      action_name = "pressed";
+      break;
+    case GLFW_RELEASE:
+      action_name = "released";
+      break;
+    case GLFW_REPEAT:
+      action_name = "repeated";
+      break;
+    default:
+      action_name = "invalid";
+      break;
+  }
+
+  string mouse_button_name;
+  switch(button) {
+    case GLFW_MOUSE_BUTTON_LEFT:
+      mouse_button_name = "left";
+      break;
+    case GLFW_MOUSE_BUTTON_RIGHT:
+      mouse_button_name = "right";
+      break;
+    case GLFW_MOUSE_BUTTON_MIDDLE:
+      mouse_button_name = "middle";
+      break;
+    default:
+      mouse_button_name = "other";
+      break;
+  }
+
+  log(1, "%s: %s mouse button (%i) %s\n", __FUNCTION__, mouse_button_name.c_str(), button, action_name.c_str());
+}
+
+void handle_window_resize_events(GLFWwindow *gl_window, s32 width, s32 height) {
+  Window *window = static_cast<Window *>(glfwGetWindowUserPointer(gl_window));
+
+  set_renderer_size(window->renderer, width, height);
+}

src/window.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "basic.h"
+#include "renderer.h"
+#include "model.h"
+
+struct Window {
+    GLFWwindow* glfw_window = nullptr;
+    Renderer* renderer = nullptr;
+    Model* model = nullptr;
+};
+
+bool init(Window *window, u32 width, u32 height, string title);
+void main_loop(Window *window);
+void cleanup(Window *window);
+void handle_close(GLFWwindow *gl_window);
+void handle_key_events(GLFWwindow *gl_window, s32 key, s32 scancode, s32 action, s32 mods);
+void handle_mouse_position_events(GLFWwindow *gl_window, f64 x_pos, f64 y_pos);
+void handle_mouse_button_events(GLFWwindow *gl_window, s32 button, s32 action, s32 mods);
+void handle_window_resize_events(GLFWwindow *gl_window, s32 width, s32 height);
+