first stable version OK

.gitignore

@@ -1,2 +1,7 @@
 build
 .vscode
+testExecutor
+install
+TODO.txt
+.cache
+compile_flags.txt

3rdlibs/stb/stb_image.c

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"

CMakeLists.txt

@@ -1,7 +1,5 @@
 cmake_minimum_required(VERSION 3.15)
 
-set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-
 project(HazelLuaEngine
     VERSION 0.1.0
     DESCRIPTION "a tiny engine made with C and Lua for 1MGames"
@@ -15,17 +13,35 @@ set(HAZEL_LUA_BRIDGE_NAME hazel)
 include(cmake/FindLua.cmake)
 include(cmake/FindGLFW.cmake)
 include(cmake/FindGLAD.cmake)
+include(cmake/FindSTB.cmake)
 
-# hazel
+# hazel-core
 aux_source_directory(src HAZEL_SRC)
-add_library(${HAZEL_CORE_NAME} STATIC ${HAZEL_SRC})
+add_library(${HAZEL_CORE_NAME} SHARED ${HAZEL_SRC})
-target_link_libraries(${HAZEL_CORE_NAME} PUBLIC glad glfw)
+target_link_libraries(${HAZEL_CORE_NAME} PUBLIC glad glfw stb_image)
 target_include_directories(${HAZEL_CORE_NAME} PUBLIC .)
 target_compile_features(${HAZEL_CORE_NAME} PUBLIC c_std_11)
+target_precompile_headers(${HAZEL_CORE_NAME} PUBLIC hazel/pch.h)
 
 if(WIN32)
     target_compile_definitions(${HAZEL_CORE_NAME} PUBLIC WIN32)
-endif(WIN32)
+elseif(APPLE)
+    target_compile_definitions(${HAZEL_CORE_NAME} PUBLIC APPLE)
+endif()
 
-# sandbox
+# lua
 add_subdirectory(binding/lua)
+
+# test
+add_subdirectory(test)
+
+# install
+install(
+    TARGETS ${HAZEL_LUA_BRIDGE_NAME} lua ${HAZEL_EXECUTOR_NAME} ${HAZEL_CORE_NAME}
+    DESTINATION ${CMAKE_SOURCE_DIR}/install
+)
+
+install(
+    DIRECTORY shader
+    DESTINATION ${CMAKE_SOURCE_DIR}/install
+)

binding/lua/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_library(${HAZEL_LUA_BRIDGE_NAME} SHARED bridge.c)
 target_link_libraries(${HAZEL_LUA_BRIDGE_NAME} PUBLIC ${HAZEL_CORE_NAME} lua)
+target_precompile_headers(${HAZEL_LUA_BRIDGE_NAME} REUSE_FROM ${HAZEL_CORE_NAME})
 
 add_executable(${HAZEL_EXECUTOR_NAME} executor.c)
-target_link_libraries(${HAZEL_EXECUTOR_NAME} PUBLIC lua)
+target_link_libraries(${HAZEL_EXECUTOR_NAME} PUBLIC lua ${HAZEL_CORE_NAME})

binding/lua/bridge.c

@@ -4,18 +4,182 @@
 #include "luaconf.h"
 
 #include "hazel/hazel.h"
+#include "hazel/renderer.h"
 
-static int LuaBridge_RunExampleWindow(lua_State* L) {
+static int LuaBridge_RenderSetClearColor(lua_State* L) {
-    Hazel_RunExampleWindow();
+    float r = luaL_checknumber(L, 1);
+    float g = luaL_checknumber(L, 2);
+    float b = luaL_checknumber(L, 3);
+    float a = luaL_checknumber(L, 4);
+    Hazel_RenderSetClearColor(r, g, b, a);
     return 0;
 }
 
-static const struct luaL_Reg hazel[] = {
+static int LuaBridge_SayHello(lua_State* L) {
-    {"RunExampleWindow", LuaBridge_RunExampleWindow},
+    printf("Hello Hazel\n");
+    return 0;
+}
+
+static int LuaBridge_RenderClear(lua_State* L) {
+    Hazel_RenderClear();
+    return 0;
+}
+
+static int LuaBridge_RenderSetDrawColor(lua_State* L) {
+    float r = luaL_checknumber(L, 1);
+    float g = luaL_checknumber(L, 2);
+    float b = luaL_checknumber(L, 3);
+    float a = luaL_checknumber(L, 4);
+    Hazel_RenderSetDrawColor(r, g, b, a);
+    return 0;
+}
+
+static int LuaBridge_RenderDrawLine(lua_State* L) {
+    float x1 = luaL_checknumber(L, 1);
+    float y1 = luaL_checknumber(L, 2);
+    float x2 = luaL_checknumber(L, 3);
+    float y2 = luaL_checknumber(L, 4);
+    Hazel_RenderDrawLine(x1, y1, x2, y2);
+    return 0;
+}
+
+static int LuaBridge_RenderDrawRect(lua_State* L) {
+    float x = luaL_checknumber(L, 1);
+    float y = luaL_checknumber(L, 2);
+    float w = luaL_checknumber(L, 3);
+    float h = luaL_checknumber(L, 4);
+    Hazel_RenderDrawRect(x, y, w, h);
+    return 0;
+}
+
+static int LuaBridge_RenderFillRect(lua_State* L) {
+    float x = luaL_checknumber(L, 1);
+    float y = luaL_checknumber(L, 2);
+    float w = luaL_checknumber(L, 3);
+    float h = luaL_checknumber(L, 4);
+    Hazel_RenderFillRect(x, y, w, h);
+    return 0;
+}
+
+static int LuaBridge_LoadTexture(lua_State* L) {
+    const char* filename = luaL_checkstring(L, 1);
+    Hazel_Texture* texture = Hazel_LoadTexture(filename);
+    lua_pushlightuserdata(L, texture);
+    return 1;
+}
+
+static int LuaBridge_DestroyTexture(lua_State* L) {
+    Hazel_Texture* texture = (Hazel_Texture*)lua_topointer(L, 1);
+    Hazel_DestroyTexture(texture);
+    return 0;
+}
+
+static int LuaBridge_TextureGetSize(lua_State* L) {
+    Hazel_Texture* texture = (Hazel_Texture*)lua_topointer(L, 1);
+    int w, h;
+    Hazel_TextureGetSize(texture, &w, &h);
+    lua_pushnumber(L, w);
+    lua_pushnumber(L, h);
+    return 2;
+}
+
+static int LuaBridge_RenderDrawTexture(lua_State* L) {
+    Hazel_Texture* texture = (Hazel_Texture*)lua_topointer(L, 1);
+    int rx = luaL_checknumber(L, 2);
+    int ry = luaL_checknumber(L, 3);
+    int rw = luaL_checknumber(L, 4);
+    int rh = luaL_checknumber(L, 5);
+    int dx = luaL_checknumber(L, 6);
+    int dy = luaL_checknumber(L, 7);
+    int dw = luaL_checknumber(L, 8);
+    int dh = luaL_checknumber(L, 9);
+    Hazel_RenderFlip flip = luaL_checknumber(L, 10);
+    Hazel_RenderDrawTexture(texture, rx, ry, rw, rh, dx, dy, dw, dh, flip);
+    return 0;
+}
+
+static int LuaBridge_GetCanvaSize(lua_State* L) {
+    int w, h;
+    Hazel_GetCanvaSize(&w, &h);
+    lua_pushnumber(L, w);
+    lua_pushnumber(L, h);
+    return 2;
+}
+
+static int LuaBridge_WindowSetIcon(lua_State* L) {
+    const char* filename = luaL_checkstring(L, 1);
+    Hazel_WindowSetIcon(filename);
+    return 0;
+}
+
+static int LuaBridge_GetKeyState(lua_State* L) {
+    int key = luaL_checkinteger(L, 1);
+    lua_pushnumber(L, Hazel_GetKeyState(key));
+    return 1;
+}
+
+static int LuaBridge_GetMousePos(lua_State* L) {
+    double x, y;
+    Hazel_GetMousePos(&x, &y);
+    lua_pushnumber(L, x);
+    lua_pushnumber(L, y);
+    return 2;
+}
+
+static int LuaBridge_GetMouseButtonState(lua_State* L) {
+    int btn = luaL_checknumber(L, 1);
+    lua_pushnumber(L, Hazel_GetMouseBtnState(btn));
+    return 1;
+}
+
+static int LuaBridge_GetTime(lua_State* L) {
+    lua_pushnumber(L, Hazel_GetTime());
+    return 1;
+}
+
+static int LuaBridge_GetWindowSize(lua_State* L) {
+    int w, h;
+    Hazel_WindowGetSize(&w, &h);
+    lua_pushnumber(L, w);
+    lua_pushnumber(L, h);
+    return 2;
+}
+
+static int LuaBridge_HideCursor() {
+    Hazel_HideCursor();
+    return 0;
+}
+
+static int LuaBridge_ShowCursor() {
+    Hazel_ShowCursor();
+    return 0;
+}
+
+static const struct luaL_Reg libhazel[] = {
+    {"RenderSetClearColor", LuaBridge_RenderSetClearColor},
+    {"RenderSetDrawColor", LuaBridge_RenderSetDrawColor},
+    {"RenderClear", LuaBridge_RenderClear},
+    {"RenderDrawLine", LuaBridge_RenderDrawLine},
+    {"RenderDrawRect", LuaBridge_RenderDrawRect},
+    {"RenderFillRect", LuaBridge_RenderFillRect},
+    {"RenderDrawTexture", LuaBridge_RenderDrawTexture},
+    {"TextureGetSize", LuaBridge_TextureGetSize},
+    {"LoadTexture", LuaBridge_LoadTexture},
+    {"DestroyTexture", LuaBridge_DestroyTexture},
+    {"GetCanvaSize", LuaBridge_GetCanvaSize},
+    {"WindowSetIcon", LuaBridge_WindowSetIcon},
+    {"GetTime", LuaBridge_GetTime},
+    {"GetWindowSize", LuaBridge_GetWindowSize},
+    {"GetMousePos", LuaBridge_GetMousePos},
+    {"GetMouseButtonState", LuaBridge_GetMouseButtonState},
+    {"GetKeyState", LuaBridge_GetKeyState},
+    {"HideCursor", LuaBridge_HideCursor},
+    {"ShowCursor", LuaBridge_ShowCursor},
+    {"SayHello", LuaBridge_SayHello},
     {NULL, NULL},
 };
 
-DLLEXPORT int luaopen_hazel(lua_State* L) {
+DLLEXPORT int luaopen_libhazel(lua_State* L) {
-    luaL_newlib(L, hazel);
+    luaL_newlib(L, libhazel);
     return 1;
 }

binding/lua/executor.c

@@ -2,19 +2,184 @@
 #include "lualib.h"
 #include "lauxlib.h"
 
-int main() {
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include "hazel/hazel.h"
+
+typedef struct {
+    int WindowWidth;
+    int WindowHeight;
+    char WindowTitle[1024];
+    char LuaEntryFile[1024];
+} Config;
+
+int getNumber(lua_State* L, const char* name, int* num) {
+    int isnum;
+    lua_getglobal(L, name);
+    *num = (int)lua_tointegerx(L, -1, &isnum);
+    if (!isnum) {
+        printf("Please check your %s field", name);
+        return 0;
+    }
+    return 1;
+}
+
+int getString(lua_State* L, const char* name, char* str) {
+    lua_getglobal(L, name);
+    const char* s = lua_tostring(L, -1);
+    if (!s) {
+        printf("Please check your %s filed", name);
+        lua_close(L);
+        return 0;
+    }
+    strcpy(str, s);
+    return 1;
+}
+
+const char* LuaConfigFileTemplate =
+"WindowWidth = 800\n"
+"WindowHeight = 600\n"
+"Title = \"LuaTinyEngine\"\n"
+"EntryFile = \"main.lua\"";
+
+void createLuaConfigFile() {
+    FILE* file = fopen("config.lua", "w+");
+    if (!file) {
+        printf("can't open file config.lua");
+        return ;
+    }
+    fputs(LuaConfigFileTemplate, file);
+    fclose(file);
+}
+
+const char* LuaEntryFileTemplate =
+"local hazel = require \"hazel\"\n"
+"\n"
+"function GameStart()\n"
+"    hazel.SayHello()\n"
+"end\n"
+"\n"
+"function GameLoop()\n"
+"end\n"
+"\n"
+"function GameQuit()\n"
+"end";
+
+void createLuaEntryFile() {
+    FILE* file = fopen("main.lua", "w+");
+    if (!file) {
+        printf("can't open file main.lua");
+        return ;
+    }
+    fseek(file, 0, SEEK_END);
+    long size = ftell(file);
+    if (size <= 0) {
+        fputs(LuaEntryFileTemplate, file);
+        fclose(file);
+    }
+}
+
+int ReadConfig(Config* config) {
+    if (!config) {
+        printf("please give me a valid config");
+        return 0;
+    }
+
     lua_State* L = luaL_newstate();
+    if (!L) {
+        printf("Fatal Error, create lua stack failed");
+        return 1;
+    }
+    if (luaL_loadfile(L, "config.lua") != 0) {
+        printf("You don't have a config.lua, create one for you.Modify it to your config.");
+        createLuaConfigFile();
+        goto ERR_HANDLE;
+    }
+    if (lua_pcall(L, 0, 0, 0) != 0) {
+        printf("pcall config file failed");
+        goto ERR_HANDLE;
+    }
+
+    if (!getNumber(L, "WindowWidth", &config->WindowWidth)) {
+        goto ERR_HANDLE;
+    }
+    if (!getNumber(L, "WindowHeight", &config->WindowHeight)) {
+        goto ERR_HANDLE;
+    }
+    if (!getString(L, "Title", config->WindowTitle)) {
+        goto ERR_HANDLE;
+    }
+    if (!getString(L, "EntryFile", config->LuaEntryFile)) {
+        goto ERR_HANDLE;
+    }
+
+    lua_close(L);
+    return 1;
+
+ERR_HANDLE:
+    lua_close(L);
+    return 0;
+}
+
+lua_State* L = NULL;
+
+void GameStart() {
+    lua_getglobal(L, "GameStart");
+    if (lua_pcall(L, 0, 0, 0)) {
+        GAME_LOG_ERROR("call GameStart function in lua failed");
+        const char* error = luaL_checkstring(L, -1);
+        GAME_LOG_ERROR("[Lua Error]: %s", error);
+    }
+}
+
+void GameLoop() {
+    lua_getglobal(L, "GameLoop");
+    if (lua_pcall(L, 0, 0, 0)) {
+        GAME_LOG_ERROR("call GameLoop function in lua failed");
+        const char* error = luaL_checkstring(L, -1);
+        GAME_LOG_ERROR("[Lua Error]: %s", error);
+    }
+}
+
+void GameQuit() {
+    lua_getglobal(L, "GameQuit");
+    if (lua_pcall(L, 0, 0, 0)) {
+        GAME_LOG_ERROR("call GameQuit function in lua failed");
+        const char* error = luaL_checkstring(L, -1);
+        GAME_LOG_ERROR("[Lua Error]: %s", error);
+    }
+}
+
+int main() {
+    Config config;
+    if (!ReadConfig(&config)) {
+        return 1;
+    }
+
+    L = luaL_newstate();
     if (!L) {
         printf("lua init failed\n");
         return 1;
     }
     luaL_openlibs(L);
 
-    if (luaL_loadfile(L, "main.lua") || lua_pcall(L, 0, 0, 0)) {
+    if (luaL_loadfile(L, config.LuaEntryFile)) {
-        printf("main.lua load and execute failed\n");
+        createLuaEntryFile();
+        ENGINE_LOG_CRITICAL("%s load and execute failed, create main.lua for you\n", config.LuaEntryFile);
+    }
+
+    if (lua_pcall(L, 0, 0, 0)) {
+        ENGINE_LOG_ERROR("[Lua Error]: %s", luaL_checkstring(L, 1));
         return 1;
     }
 
+    Hazel_Init(config.WindowTitle, config.WindowWidth, config.WindowHeight);
+    Hazel_RegistGameFuncs(GameStart, GameLoop, GameQuit);
+
+    Hazel_Run();
+
+    Hazel_Quit();
     lua_close(L);
     return 0;
 }

binding/lua/main.lua

@@ -1,5 +0,0 @@
----@class hazel
----@field RunExampleWindow function
-local hazel = require "hazel"
-
-hazel.RunExampleWindow()

cmake/FindLua.cmake

@@ -33,7 +33,7 @@ set(LUA_SRC
     3rdlibs/lua/src/linit.c
 )
 
-add_library(lua STATIC ${LUA_SRC})
+add_library(lua SHARED ${LUA_SRC})
 target_include_directories(lua PUBLIC ./3rdlibs/lua/src)
 target_compile_features(lua PRIVATE c_std_99)
 

cmake/FindSTB.cmake

@@ -0,0 +1,2 @@
+add_library(stb_image STATIC 3rdlibs/stb/stb_image.c)
+target_include_directories(stb_image PUBLIC 3rdlibs/stb)

hazel/dllexport.h

@@ -0,0 +1,10 @@
+#ifndef __HAZEL_DLLEXPORT_H__
+#define __HAZEL_DLLEXPORT_H__
+
+#ifdef WIN32
+#define DLLEXPORT __declspec(dllexport)
+#else
+#define DLLEXPORT
+#endif
+
+#endif

hazel/glhelper.h

@@ -0,0 +1,19 @@
+#ifndef __HAZEL_GLHELPER_H__
+#define __HAZEL_GLHELPER_H__
+
+#include "glad/glad.h"
+
+#define TRY_GET_GL_ERROR_MAX_LOOP 10000
+
+const char* GLGetErrorString(GLenum);
+
+void GLClearError();
+
+#define GL_CALL(statement) do { \
+    GLClearError(); \
+    statement; \
+    GLenum ___err_inner_use = glGetError(); \
+    if (___err_inner_use != GL_NO_ERROR) { GL_LOG_ERROR("%s", GLGetErrorString(___err_inner_use)); } \
+} while(0)
+
+#endif

hazel/hazel.h

@@ -2,7 +2,28 @@
 #define __HAZEL_HAZEL_H__
 
 #include "pch.h"
+#include "window.h"
+#include "renderer.h"
 
-DLLEXPORT void Hazel_RunExampleWindow();
+typedef void(*Hazel_BeforeGameStartFunc)(void);
+typedef void(*Hazel_GameLoopFunc)(void);
+typedef void(*Hazel_BeforeGameQuitFunc)(void);
+typedef void(*Hazel_KeyInputFunc)(GLFWwindow*, int, int, int, int);
+typedef void(*Hazel_MousePosInputFunc)(GLFWwindow*, double, double);
+typedef void(*Hazel_MouseButtonInputFunc)(GLFWwindow*, int, int , int);
+
+DLLEXPORT void Hazel_Init(const char* title, int w, int h);
+DLLEXPORT void Hazel_Quit();
+DLLEXPORT int Hazel_ShouldClose();
+DLLEXPORT void Hazel_Run();
+DLLEXPORT void Hazel_RegistGameFuncs(Hazel_BeforeGameStartFunc, Hazel_GameLoopFunc, Hazel_BeforeGameQuitFunc);
+DLLEXPORT void Hazel_RegistInputFuncs(Hazel_KeyInputFunc, Hazel_MousePosInputFunc, Hazel_MouseButtonInputFunc);
+DLLEXPORT int Hazel_GetKeyState(int key);
+DLLEXPORT int Hazel_GetMouseBtnState(int btn);
+DLLEXPORT void Hazel_SetCursorPos(double x, double y);
+DLLEXPORT void Hazel_GetMousePos(double* x, double* y);
+DLLEXPORT double Hazel_GetTime();
+DLLEXPORT void Hazel_HideCursor();
+DLLEXPORT void Hazel_ShowCursor();
 
 #endif

hazel/log.h

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <string.h>
+#include "dllexport.h"
+
+DLLEXPORT const char* GetFilename(const char* fullpath);
+
+#define ENGINE_LOG_CRITICAL(fmt, ...) do {printf("[Engine Critical][%d]%s - %s]: " fmt "\n", __LINE__, GetFilename(__FILE__), __FUNCTION__, ##__VA_ARGS__); fflush(stdout), exit(1); } while(0)
+#define ENGINE_LOG_ERROR(fmt, ...)    do {printf("[Engine Error][%d][%s - %s]: " fmt "\n", __LINE__, GetFilename(__FILE__), __FUNCTION__, ##__VA_ARGS__); fflush(stdout); } while(0)
+#define ENGINE_LOG_INFO(fmt, ...)     do {printf("[Engine Info][%d][%s - %s]: " fmt "\n", __LINE__, GetFilename(__FILE__), __FUNCTION__, ##__VA_ARGS__); fflush(stdout); } while(0)
+#define ENGINE_LOG_WARN(fmt, ...)     do {printf("[Engine Warn][%d][%s - %s]: " fmt "\n", __LINE__, GetFilename(__FILE__), __FUNCTION__, ##__VA_ARGS__); fflush(stdout); } while(0)
+#define ENGINE_LOG_DEBUG(fmt, ...)    do {printf("[Engine Debug][%d][%s - %s]: " fmt "\n", __LINE__, GetFilename(__FILE__), __FUNCTION__, ##__VA_ARGS__); fflush(stdout); } while(0)
+
+#define GL_LOG_CRITICAL(fmt, ...) do {printf("[GL Critical][%d][%s - %s]: " fmt "\n", __LINE__, GetFilename(__FILE__), __FUNCTION__, ##__VA_ARGS__); fflush(stdout); exit(1); } while(0)
+#define GL_LOG_ERROR(fmt, ...)    do {printf("[GL Error][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__);  fflush(stdout);} while(0)
+#define GL_LOG_INFO(fmt, ...)     do {printf("[GL Info][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__);  fflush(stdout);} while(0)
+#define GL_LOG_WARN(fmt, ...)     do {printf("[GL Warn][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__);  fflush(stdout);} while(0)
+#define GL_LOG_DEBUG(fmt, ...)    do {printf("[GL Debug][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__); fflush(stdout);} while(0)
+
+#define GAME_LOG_CRITICAL(fmt, ...) do {printf("[Game Critical][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, ##__VA_ARGS__); fflush(stdout); } while(0)
+#define GAME_LOG_ERROR(fmt, ...)   do {printf("[Game Error][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__); fflush(stdout);} while(0)
+#define GAME_LOG_INFO(fmt, ...)     do {printf("[Game Info][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__);  fflush(stdout);} while(0)
+#define GAME_LOG_WARN(fmt, ...)     do {printf("[Game Warn][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__);  fflush(stdout);} while(0)
+#define GAME_LOG_DEBUG(fmt, ...)    do {printf("[Game Debug][%d][%s - %s]: " fmt "\n", __LINE__, __FUNCTION__, GetFilename(__FILE__), ##__VA_ARGS__); fflush(stdout);} while(0)

hazel/pch.h

@@ -4,16 +4,13 @@
 #define GLFW_INCLUDE_NONE
 #include "GLFW/glfw3.h"
 
-#include "glad/glad.h"
+#include "stb_image.h"
 
-#include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
+#include <math.h>
 
-#ifdef WIN32
+#include "log.h"
-#define DLLEXPORT __declspec(dllexport)
+#include "glhelper.h"
-#else
+#include "dllexport.h"
-#define DLLEXPORT
-#endif
 
 #endif

hazel/renderer.h

@@ -0,0 +1,31 @@
+#ifndef __HAZEL_RENDERER_H__
+#define __HAZEL_RENDERER_H__
+
+#include "pch.h"
+#include "texture.h"
+
+typedef enum {
+    FLIP_NONE = 0x00,
+    FLIP_HORIZONTAL = 0x01,
+    FLIP_VERTICAL = 0x02,
+    FLIP_BOTH = FLIP_HORIZONTAL | FLIP_VERTICAL,
+} Hazel_RenderFlip;
+
+DLLEXPORT void Hazel_RenderInit(int w, int h);
+DLLEXPORT void Hazel_RenderQuit();
+
+DLLEXPORT void Hazel_RenderSetClearColor(float r, float g, float b, float a);
+DLLEXPORT void Hazel_RenderClear();
+DLLEXPORT void Hazel_RenderSetDrawColor(float r, float g, float b, float a);
+DLLEXPORT void Hazel_RenderSetViewport(int x, int y, int w, int h);
+
+DLLEXPORT void Hazel_RenderDrawLine(int x1, int y1, int x2, int y2);
+DLLEXPORT void Hazel_RenderDrawRect(int x, int y, int w, int h);
+DLLEXPORT void Hazel_RenderFillRect(int x, int y, int w, int h);
+
+DLLEXPORT void Hazel_RenderDrawTexture(Hazel_Texture *texture,
+                                       int rx, int ry, int rw, int rh,
+                                       int dx, int dy, int dw, int dh,
+                                       Hazel_RenderFlip);
+
+#endif

hazel/texture.h

@@ -0,0 +1,19 @@
+#ifndef __HAZEL_TEXTURE_H__
+#define __HAZEL_TEXTURE_H__
+
+#include "pch.h"
+
+struct Hazel_Texture;
+typedef struct Hazel_Texture Hazel_Texture;
+
+DLLEXPORT Hazel_Texture* Hazel_LoadTexture(const char* filename);
+DLLEXPORT Hazel_Texture* Hazel_CreateTexture(const unsigned char* data, int w, int h);
+DLLEXPORT void Hazel_DestroyTexture(Hazel_Texture*);
+DLLEXPORT void Hazel_TextureGetSize(Hazel_Texture*, int* w, int* h);
+DLLEXPORT void Hazel_TextureSetAlpha(Hazel_Texture*, float);
+DLLEXPORT void Hazel_TextureSetColor(Hazel_Texture*, float r, float g, float b);
+DLLEXPORT float Hazel_TextureGetAlpha(Hazel_Texture*);
+DLLEXPORT void Hazel_TextureGetColor(Hazel_Texture*, float* r, float* g, float* b);
+void Hazel_BindTexture(Hazel_Texture*);
+
+#endif

hazel/window.h

@@ -0,0 +1,13 @@
+#ifndef __HAZEL_WINDOW_H__
+#define __HAZEL_WINDOW_H__
+
+#include "pch.h"
+
+extern GLFWwindow* window;
+
+int Hazel_InitWindow(const char* title, int width, int height);
+DLLEXPORT void Hazel_WindowGetSize(int* w, int* h);
+DLLEXPORT void Hazel_GetCanvaSize(int* w, int* h);
+DLLEXPORT void Hazel_WindowSetIcon(const char* filename);
+
+#endif

shader/shader.frag

@@ -0,0 +1,12 @@
+#version 330 core
+
+in vec2 Texcoord;
+
+out vec4 FragColor;
+
+uniform vec4 Color;
+uniform sampler2D Texture;
+
+void main() {
+    FragColor = Color * texture(Texture, Texcoord);
+}

shader/shader.vert

@@ -0,0 +1,13 @@
+#version 330 core
+
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexcoord;
+
+out vec2 Texcoord;
+
+uniform mat4 Project;
+
+void main() {
+    Texcoord = aTexcoord;
+    gl_Position = Project * vec4(aPos, 0, 1);
+}

src/glhelper.c

@@ -0,0 +1,21 @@
+#include "hazel/glhelper.h"
+
+void GLClearError() {
+    int loop = 0;
+    while (loop < TRY_GET_GL_ERROR_MAX_LOOP && glGetError() != GL_NO_ERROR) { loop++; }
+}
+
+#define CASE(e) case e: return #e;
+
+const char* GLGetErrorString(GLenum err) {
+    switch (err) {
+        CASE(GL_NO_ERROR)
+        CASE(GL_INVALID_ENUM)
+        CASE(GL_INVALID_VALUE)
+        CASE(GL_INVALID_OPERATION)
+        CASE(GL_OUT_OF_MEMORY)
+        CASE(GL_INVALID_FRAMEBUFFER_OPERATION)
+        default:
+            return "Unknown Error";
+    }
+}

src/hazel.c

@@ -1,37 +1,82 @@
 #include "hazel/hazel.h"
 
-void Hazel_RunExampleWindow() {
+Hazel_GameLoopFunc gameLoopCallback = NULL;
-    GLFWwindow* window;
+Hazel_BeforeGameStartFunc beforeGameStartCallback = NULL;
+Hazel_BeforeGameQuitFunc beforeGameQuitCallback = NULL;
 
-    /* Initialize the library */
+void Hazel_Init(const char* title, int w, int h) {
-    if (!glfwInit())
+    Hazel_InitWindow(title, w, h);
-        return;
+    Hazel_RenderInit(w, h);
-
-    /* Create a windowed mode window and its OpenGL context */
-    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
-    if (!window) {
-        glfwTerminate();
-        return;
 }
 
-    /* Make the window's context current */
+void Hazel_Quit() {
-    glfwMakeContextCurrent(window);
+    Hazel_RenderQuit();
+    glfwTerminate();
+}
 
-    /* Use Glad to load OpenGL */
+int Hazel_ShouldClose() {
-    gladLoadGL();
+    return glfwWindowShouldClose(window);
+}
 
-    glClearColor(0.1, 0.1, 0.1, 1);
-    /* Loop until the user closes the window */
-    while (!glfwWindowShouldClose(window)) {
-        /* Render here */
-        glClear(GL_COLOR_BUFFER_BIT);
 
-        /* Swap front and back buffers */
+void Hazel_RegistGameFuncs(Hazel_BeforeGameStartFunc before, Hazel_GameLoopFunc doing, Hazel_BeforeGameQuitFunc after) {
-        glfwSwapBuffers(window);
+    beforeGameStartCallback = before;
+    gameLoopCallback = doing;
+    beforeGameQuitCallback = after;
+}
 
-        /* Poll for and process events */
+void Hazel_Run() {
+    if (beforeGameStartCallback) {
+        beforeGameStartCallback();
+    }
+
+    while (!Hazel_ShouldClose()) {
         glfwPollEvents();
+
+        if (gameLoopCallback) {
+            gameLoopCallback();
         }
 
-    glfwTerminate();
+        glfwSwapBuffers(window);
+    }
+
+    if (beforeGameQuitCallback) {
+        beforeGameQuitCallback();
+    }
+}
+
+double Hazel_GetTime() {
+    return glfwGetTime();
+}
+
+void Hazel_RegistInputFuncs(Hazel_KeyInputFunc keyInput,
+                            Hazel_MousePosInputFunc mousePosInput,
+                            Hazel_MouseButtonInputFunc mouseBtnInput) {
+    glfwSetKeyCallback(window, keyInput);
+    glfwSetCursorPosCallback(window, mousePosInput);
+    glfwSetMouseButtonCallback(window, mouseBtnInput);
+}
+
+int Hazel_GetKeyState(int key) {
+    return glfwGetKey(window, key);
+}
+
+void Hazel_GetMousePos(double* x, double* y) {
+    glfwGetCursorPos(window, x, y);
+}
+
+void Hazel_SetCursorPos(double x, double y) {
+    glfwSetCursorPos(window, x, y);
+}
+
+int Hazel_GetMouseBtnState(int btn) {
+    return glfwGetMouseButton(window, btn);
+}
+
+void Hazel_HideCursor() {
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
+}
+
+void Hazel_ShowCursor() {
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
 }

src/log.c

@@ -0,0 +1,7 @@
+#include "hazel/log.h"
+
+const char* GetFilename(const char* fullpath) {
+    const char* ptr = fullpath + strlen(fullpath);
+    while (*ptr != '/' && *ptr != '\\' && ptr != fullpath) ptr--;
+    return ptr == fullpath ? ptr : ptr + 1;
+}

src/renderer.c

@@ -0,0 +1,239 @@
+#include "hazel/renderer.h"
+
+struct {
+    GLuint shader, vbo, vao;
+    Hazel_Texture* whiteTexture;
+    float currentR, currentG, currentB, currentA;
+} RenderContext;
+
+void loadFile(const char* filename, char* buf) {
+    FILE* file = fopen(filename, "r+");
+    if (!file) {
+        fclose(file);
+        ENGINE_LOG_CRITICAL("shader file %s load failed", filename);
+    }
+    fseek(file, 0, SEEK_END);
+    long len = ftell(file);
+    rewind(file);
+    len = fread(buf, 1, len, file);
+    buf[len] = '\0';
+    fclose(file);
+}
+
+GLuint createShader() {
+    int bufSize = sizeof(GLchar) * 1024;
+    GLchar* buf = malloc(bufSize);
+    memset(buf, 0, bufSize);
+
+    GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
+    loadFile("shader/shader.vert", buf);
+    GL_CALL(glShaderSource(vertexShader, 1, &buf, NULL));
+    GL_CALL(glCompileShader(vertexShader));
+
+    int success;
+    char infoLog[1024];
+    GL_CALL(glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success));
+    if (!success) {
+        glGetShaderInfoLog(vertexShader, sizeof(infoLog), NULL, infoLog);
+        ENGINE_LOG_ERROR("vertex shader compile error:\n%s", infoLog);
+    }
+
+    GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+    loadFile("shader/shader.frag", buf);
+    GL_CALL(glShaderSource(fragShader, 1, &buf, NULL));
+    GL_CALL(glCompileShader(fragShader));
+    GL_CALL(glGetShaderiv(fragShader, GL_COMPILE_STATUS, &success));
+    if (!success) {
+        GL_CALL(glGetShaderInfoLog(fragShader, sizeof(infoLog), NULL, infoLog));
+        ENGINE_LOG_ERROR("fragment shader compile error:\n%s", infoLog);
+    }
+
+    GLuint shader = glCreateProgram();
+    GL_CALL(glAttachShader(shader, vertexShader));
+    GL_CALL(glAttachShader(shader, fragShader));
+    GL_CALL(glLinkProgram(shader));
+
+    GL_CALL(glGetProgramiv(shader, GL_LINK_STATUS, &success));
+    if(!success) {
+        GL_CALL(glGetProgramInfoLog(shader, sizeof(infoLog), NULL, infoLog));
+        ENGINE_LOG_ERROR("shader link error:\n%s", infoLog);
+    }
+
+    GL_CALL(glDeleteShader(vertexShader));
+    GL_CALL(glDeleteShader(fragShader));
+
+    return shader;
+}
+
+void setProjectUniform(int w, int h) {
+    float left = 0, right = w, top = 0, bottom = h, near = -1, far = 1;
+    float projectMat[] = {
+                       2 / (right - left),                               0,                           0, 0,
+                                        0,              2 / (top - bottom),                           0, 0,
+                                        0,                               0,            2 / (near - far), 0,
+          (right + left) / (left - right), (top + bottom) / (bottom - top), (near + far) / (far - near), 1,
+    };
+    GLint loc = glGetUniformLocation(RenderContext.shader, "Project");
+    if (loc < 0) {
+        ENGINE_LOG_ERROR("shader uniform variable Project not found");
+    }
+    GL_CALL(glUniformMatrix4fv(loc, 1, GL_FALSE, projectMat));
+}
+
+void initBuffer() {
+    GL_CALL(glGenBuffers(1, &RenderContext.vbo));
+    if (RenderContext.vbo == 0) {
+        ENGINE_LOG_CRITICAL("vertex buffer create failed");
+    }
+    GL_CALL(glBindBuffer(GL_ARRAY_BUFFER, RenderContext.vbo));
+}
+
+void initVertexArray() {
+    GL_CALL(glGenVertexArrays(1, &RenderContext.vao));
+    if (RenderContext.vao == 0) {
+        ENGINE_LOG_CRITICAL("vertex array create failed");
+    }
+    GL_CALL(glBindVertexArray(RenderContext.vao));
+    GL_CALL(glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0));
+    GL_CALL(glEnableVertexAttribArray(0));
+    GL_CALL(glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float))));
+    GL_CALL(glEnableVertexAttribArray(1));
+}
+
+
+void Hazel_RenderInit(int w, int h) {
+    RenderContext.shader = createShader();
+
+    GL_CALL(glUseProgram(RenderContext.shader));
+    setProjectUniform(w, h);
+
+    initBuffer();
+    initVertexArray();
+
+    unsigned char data[] = {255, 255, 255, 255};
+    RenderContext.whiteTexture = Hazel_CreateTexture((void*)data, 1, 1);
+
+    GL_CALL(glActiveTexture(GL_TEXTURE0));
+    Hazel_RenderSetDrawColor(1, 1, 1, 1);
+
+    GL_CALL(glEnable(GL_BLEND));
+    GL_CALL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
+}
+
+void Hazel_RenderQuit() {
+    Hazel_DestroyTexture(RenderContext.whiteTexture);
+    GL_CALL(glDeleteProgram(RenderContext.shader));
+    GL_CALL(glDeleteBuffers(1, &RenderContext.vbo));
+    GL_CALL(glDeleteVertexArrays(1, &RenderContext.vao));
+}
+
+void Hazel_RenderSetClearColor(float r, float g, float b, float a) {
+    GL_CALL(glClearColor(r, g, b, a));
+}
+
+void Hazel_RenderSetDrawColor(float r, float g, float b, float a) {
+    if (RenderContext.currentR == r &&
+        RenderContext.currentG == g &&
+        RenderContext.currentB == b &&
+        RenderContext.currentA == a) {
+        return;
+    }
+    GLint loc = glGetUniformLocation(RenderContext.shader, "Color");
+    if (loc < 0) {
+        ENGINE_LOG_ERROR("shader uniform variable Color not found");
+        return;
+    }
+    GL_CALL(glUniform4f(loc, r, g, b, a));
+    RenderContext.currentR = r;
+    RenderContext.currentG = g;
+    RenderContext.currentB = b;
+    RenderContext.currentA = a;
+}
+
+void Hazel_RenderClear() {
+    GL_CALL(glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT));
+}
+
+void Hazel_RenderSetViewport(int x, int y, int w, int h) {
+    GL_CALL(glViewport(x, y, w, h));
+}
+
+void Hazel_RenderDrawLine(int x1, int y1, int x2, int y2) {
+    Hazel_BindTexture(RenderContext.whiteTexture);
+    float vertices[] = {
+        x1, y1, 0, 0,
+        x2, y2, 0, 0,
+    };
+    GL_CALL(glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW));
+    GL_CALL(glDrawArrays(GL_LINES, 0, 2));
+}
+
+void Hazel_RenderDrawRect(int x, int y, int w, int h) {
+    Hazel_BindTexture(RenderContext.whiteTexture);
+    float vertices[] = {
+        x, y, 0, 0,
+        x + w, y, 0, 0,
+        x + w, y + h, 0, 0,
+        x, y + h, 0, 0,
+    };
+    GL_CALL(glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW));
+    GL_CALL(glDrawArrays(GL_LINE_LOOP, 0, 4));
+}
+
+void Hazel_RenderFillRect(int x, int y, int w, int h) {
+    Hazel_BindTexture(RenderContext.whiteTexture);
+    float vertices[] = {
+        x, y, 0, 0,
+        x + w, y, 0, 0,
+        x + w, y + h, 0, 0,
+
+        x, y, 0, 0,
+        x + w, y + h, 0, 0,
+        x, y + h, 0, 0,
+    };
+    GL_CALL(glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW));
+    GL_CALL(glDrawArrays(GL_TRIANGLES, 0, 6));
+}
+
+void swap(float* v1, float* v2) {
+    float tmp = *v1;
+    *v1 = *v2;
+    *v2 = tmp;
+}
+
+void Hazel_RenderDrawTexture(Hazel_Texture* texture,
+                             int rx, int ry, int rw, int rh,
+                             int dx, int dy, int dw, int dh,
+                             Hazel_RenderFlip flip) {
+    if (!texture) return;
+    float r, g, b, a = Hazel_TextureGetAlpha(texture);
+    Hazel_TextureGetColor(texture, &r, &g, &b);
+    Hazel_RenderSetDrawColor(r, g, b, a);
+    Hazel_BindTexture(texture);
+
+    int w, h;
+    Hazel_TextureGetSize(texture, &w, &h);
+    float p1x = dx, p1y = dy,
+          p2x = dx + dw, p2y = dy,
+          p3x = dx + dw, p3y = dy + dh,
+          p4x = dx, p4y = dy + dh;
+    if (flip & FLIP_HORIZONTAL) {
+        swap(&p1x, &p2x);
+        swap(&p3x, &p4x);
+    }
+    if (flip & FLIP_VERTICAL) {
+        swap(&p1y, &p3y);
+        swap(&p2y, &p4y);
+    }
+    float vertices[] = {
+        p1x, p1y, rx / (float)w, ry / (float)h,
+        p2x, p2y, (rx + rw) / (float)w, ry / (float)h,
+        p3x, p3y, (rx + rw) / (float)w, (ry + rh) / (float)h,
+
+        p1x, p1y, rx / (float)w, ry / (float)h,
+        p3x, p3y, (rx + rw) / (float)w, (ry + rh) / (float)h,
+        p4x, p4y, rx / (float)w, (ry + rh) / (float)h,
+    };
+    GL_CALL(glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW));
+    GL_CALL(glDrawArrays(GL_TRIANGLES, 0, 6));
+}

src/texture.c

@@ -0,0 +1,83 @@
+#include "hazel/texture.h"
+
+struct Hazel_Texture {
+    GLuint id;
+    int w;
+    int h;
+    float r, g, b, a;
+};
+
+Hazel_Texture* Hazel_LoadTexture(const char* filename) {
+    int w, h, channel;
+    unsigned char* data = stbi_load(filename, &w, &h, &channel, 4);
+    if (!data) {
+        ENGINE_LOG_ERROR("load %s failed", filename);
+        return NULL;
+    }
+    Hazel_Texture* texture = Hazel_CreateTexture(data, w, h);
+    stbi_image_free(data);
+    return texture;
+}
+
+void Hazel_TextureSetAlpha(Hazel_Texture* texture, float alpha) {
+    if (!texture) return;
+    texture->a = alpha;
+}
+
+void Hazel_TextureSetColor(Hazel_Texture* texture, float r, float g, float b) {
+    if (!texture) return;
+    texture->r = r;
+    texture->g = g;
+    texture->b = b;
+}
+
+Hazel_Texture* Hazel_CreateTexture(const unsigned char* data, int w, int h) {
+    Hazel_Texture* result = (Hazel_Texture*)malloc(sizeof(Hazel_Texture));
+    result->w = w;
+    result->h = h;
+    result->r = 1;
+    result->g = 1;
+    result->b = 1;
+    result->a = 1;
+    GL_CALL(glGenTextures(1, &result->id));
+    GL_CALL(glBindTexture(GL_TEXTURE_2D, result->id));
+    GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT));   
+    GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT));
+    GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
+    GL_CALL(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
+    GL_CALL(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data));
+    return result;
+}
+
+void Hazel_DestroyTexture(Hazel_Texture* texture) {
+    if (texture) {
+        GL_CALL(glDeleteTextures(1, &texture->id));
+        free(texture);
+    }
+}
+
+void Hazel_TextureGetSize(Hazel_Texture* texture, int* w, int* h) {
+    if (texture) {
+        if (w) *w = texture->w;
+        if (h) *h = texture->h;
+    } else {
+        if (w) *w = 0;
+        if (h) *h = 0;
+    }
+}
+
+void Hazel_BindTexture(Hazel_Texture* texture) {
+    GL_CALL(glBindTexture(GL_TEXTURE_2D, texture ? texture->id : 0));
+}
+
+float Hazel_TextureGetAlpha(Hazel_Texture* texture) {
+    return texture ? texture->a : -1;
+}
+
+void Hazel_TextureGetColor(Hazel_Texture* texture, float* r, float* g, float* b) {
+    if (texture) {
+        if (r) *r = texture->r;
+        if (g) *g = texture->g;
+        if (b) *b = texture->b;
+    }
+}

src/window.c

@@ -0,0 +1,60 @@
+#include "hazel/window.h"
+
+GLFWwindow* window = NULL;
+int canvaW = 0, canvaH = 0;
+
+void Hazel_GetCanvaSize(int* w, int* h) {
+    if (w) *w = canvaW;
+    if (h) *h = canvaH;
+}
+
+void windowResizeCallback(GLFWwindow* window, int width, int height) {
+    GL_CALL(glViewport(0, 0, width, height));
+}
+
+int Hazel_InitWindow(const char* title, int width, int height) {
+    if (!glfwInit()) {
+        GAME_LOG_CRITICAL("glfw init failed");
+        return 0;
+    }
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+#ifdef APPLE
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+
+    window = glfwCreateWindow(width, height, title, NULL, NULL);
+    if (!window) {
+        glfwTerminate();
+        return 0;
+    }
+
+    canvaW = width;
+    canvaH = height;
+
+    GAME_LOG_INFO("window create OK");
+
+    glfwMakeContextCurrent(window);
+
+    gladLoadGL();
+    GL_CALL(glViewport(0, 0, width, height));
+    glfwSetFramebufferSizeCallback(window, windowResizeCallback);
+    return 1;
+}
+
+void Hazel_WindowGetSize(int* w, int* h) {
+    glfwGetWindowSize(window, w, h);
+}
+
+void Hazel_WindowSetIcon(const char* filename) {
+    GLFWimage icon;
+    int channel;
+    icon.pixels = stbi_load(filename, &icon.width, &icon.height, &channel, 0);
+    if (!icon.pixels) {
+        ENGINE_LOG_ERROR("icon %s load failed", filename);
+    } else {
+        glfwSetWindowIcon(window, 1, &icon);
+        stbi_image_free(icon.pixels);
+    }
+}

test/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_executable(main main.c)
+target_link_libraries(main PUBLIC ${HAZEL_CORE_NAME})
+target_precompile_headers(main REUSE_FROM ${HAZEL_CORE_NAME})

test/main.c

@@ -0,0 +1,40 @@
+#include "hazel/hazel.h"
+#include "hazel/renderer.h"
+
+Hazel_Texture* texture = NULL;
+
+void GameStart() {
+    texture = Hazel_LoadTexture("test/resources/player.png");
+    Hazel_TextureSetColor(texture, 0, 1, 0);
+    Hazel_TextureSetAlpha(texture, 0.3);
+}
+
+void GameLoop() {
+    Hazel_RenderSetClearColor(0.1, 0.1, 0.1, 1);
+    Hazel_RenderClear();
+
+    Hazel_RenderSetDrawColor(0.5, 0.1, 0.1, 1);
+    Hazel_RenderDrawLine(0, 0, 800, 600);
+
+    Hazel_RenderSetDrawColor(0, 0.8, 0.1, 1);
+    Hazel_RenderDrawRect(100, 100, 200, 100);
+
+    int w, h;
+    Hazel_TextureGetSize(texture, &w, &h);
+    Hazel_RenderDrawTexture(texture, 10, 0, 10, 10, 0, 0, w * 3, h * 3, FLIP_HORIZONTAL);
+
+    Hazel_RenderSetDrawColor(0, 0, 0.9, 1);
+    Hazel_RenderFillRect(100, 300, 200, 100);
+}
+
+void GameQuit() {
+    Hazel_DestroyTexture(texture);
+}
+
+int main() {
+    Hazel_Init("test", 800, 600);
+    Hazel_RegistGameFuncs(GameStart, GameLoop, GameQuit);
+    Hazel_Run();
+    Hazel_Quit();
+    return 0;
+}