basic framework OK

Makefile

@@ -0,0 +1,18 @@
+GLFW_DEP = -L./libs/glfw/ -lglfw
+GLAD_DEP = -I./libs/glad/include
+STB_IMAGE_DEP = -I./libs/stb_image
+SRC = $(wildcard ./*.cpp) ./libs/glad/src/gl.c ./libs/stb_image/stbi_image.cpp
+CPP_FLAGS = -std=c++17
+
+game.out: $(SRC)
+	$(CXX) $^ ${GLFW_DEP} -o $@ ${GLAD_DEP} ${STB_IMAGE_DEP} ${CPP_FLAGS}
+
+.PHONY:clean pack
+clean:
+	-rm *.o
+	-rm *.out
+pack:
+	-rm -r output
+	-mkdir output
+	-mv game.out output/
+	-cp libs/glfw/libglfw.3.dylib output/

engine.cpp

@@ -0,0 +1,57 @@
+#include "engine.hpp"
+#include "event.hpp"
+
+void error_callback(int error, const char* description) {
+    fprintf(stderr, "Error: %s\n", description);
+}
+
+void Engine::Init(const std::string& title, const Size& size) {
+    if (!glfwInit()) {
+        throw std::runtime_error("glfw init failed");
+    }
+    glfwSetErrorCallback(error_callback);
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    // only for MacOS
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+
+    window_ = glfwCreateWindow(size.x, size.y,
+                               title.c_str(),
+                               NULL, NULL);
+
+    if (!window_) {
+        glfwTerminate();
+        throw std::runtime_error("glfw window create failed");
+    }
+
+    glfwMakeContextCurrent(window_);
+
+    glfwSetFramebufferSizeCallback(engine.GetWindow(), OnWindowResize);
+
+    Renderer::Init();
+
+    Renderer::SetViewport(0, 0, size.x, size.y);
+}
+
+void Engine::SwapContext() {
+    glfwSwapBuffers(window_);
+}
+
+void Engine::PollEvent() {
+    glfwPollEvents();
+}
+
+void Engine::Shutdown() {
+    glfwDestroyWindow(window_);
+    glfwTerminate();
+}
+
+void Engine::Update() {
+}
+
+void Engine::Render() {
+}
+
+Engine engine;

engine.hpp

@@ -0,0 +1,33 @@
+#pragma once
+#include "pch.hpp"
+#include "libmath.hpp"
+#include "renderer.hpp"
+#include <string>
+#include <exception>
+
+class Engine final {
+public:
+    void Init(const std::string& title, const Size& size);
+    void Shutdown();
+
+    void Exit() { shouldExit_ = true; }
+    bool ShouldExit() const { return glfwWindowShouldClose(window_); }
+
+    // TODO implement your logic here
+    void Update();
+    // TODO implement your render here
+    void Render();
+
+    GLFWwindow* GetWindow() { return window_; }
+
+    void SwapContext();
+    void PollEvent();
+
+private:
+    bool shouldExit_ = false;
+
+    // window
+    GLFWwindow* window_;
+};
+
+extern Engine engine;

event.cpp

@@ -0,0 +1,5 @@
+#include "event.hpp"
+
+void OnWindowResize(GLFWwindow* window, int width, int height) {
+    Renderer::SetViewport(0, 0, width, height);
+}

event.hpp

@@ -0,0 +1,5 @@
+#pragma once
+#include "renderer.hpp"
+
+void OnWindowResize(GLFWwindow* window, int width, int height);
+void OnKeyDown(GLFWwindow* window, int key, int scancode, int action, int mods);

glhelpfunc.cpp

@@ -0,0 +1,19 @@
+#include "glhelpfunc.hpp"
+
+#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 OpenGL Error";
+    }
+    return "Unknown Error";
+}
+
+#undef CASE

glhelpfunc.hpp

@@ -0,0 +1,15 @@
+#pragma once
+#include "pch.hpp"
+#include "log.hpp"
+
+const char* GLGetErrorString(GLenum);
+inline void GLClearError() {
+    while (glGetError() != GL_NO_ERROR) {}
+}
+
+#define GL_CALL(statement) do { \
+    GLClearError(); \
+    statement; \
+    GLenum ___err_inner_use = glGetError(); \
+    if (___err_inner_use != GL_NO_ERROR) Log("OpenGL Error: %s", GLGetErrorString(___err_inner_use)); \
+} while(0)

libmath.cpp

@@ -0,0 +1,41 @@
+#include "libmath.hpp"
+
+Point operator+(const Point& p1, const Point& p2) {
+    return Point{p1.x + p2.x, p1.y + p2.y};
+}
+
+Point operator-(const Point& p1, const Point& p2) {
+    return Point{p1.x - p2.x, p1.y - p2.y};
+}
+
+Point operator*(const Point& p1, const Point& p2) {
+    return Point{p1.x * p2.x, p1.y * p2.y};
+}
+
+Point operator/(const Point& p1, const Point& p2) {
+    return Point{p1.x / p2.x, p1.y / p2.y};
+}
+
+Point& operator+=(Point& p1, const Point& p2) {
+    p1.x += p2.x;
+    p1.y += p2.y;
+    return p1;
+}
+
+Point& operator-=(Point& p1, const Point& p2) {
+    p1.x -= p2.x;
+    p1.y -= p2.y;
+    return p1;
+}
+
+Point& operator*=(Point& p1, const Point& p2) {
+    p1.x *= p2.x;
+    p1.y *= p2.y;
+    return p1;
+}
+
+Point& operator/=(Point& p1, const Point& p2) {
+    p1.x /= p2.x;
+    p1.y /= p2.y;
+    return p1;
+}

libmath.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+struct Point {
+    float x;
+    float y;
+};
+
+struct Rect {
+    float x;
+    float y;
+    float w;
+    float h;
+};
+
+struct Color {
+    float r;
+    float g;
+    float b;
+    float a;
+};
+
+using Size = Point;
+using Rect = Rect;
+
+Point operator+(const Point& p1, const Point& p2);
+Point operator-(const Point& p1, const Point& p2);
+Point operator*(const Point& p1, const Point& p2);
+Point operator/(const Point& p1, const Point& p2);
+Point& operator+=(Point& p1, const Point& p2);
+Point& operator-=(Point& p1, const Point& p2);
+Point& operator*=(Point& p1, const Point& p2);
+Point& operator/=(Point& p1, const Point& p2);

libs/glad/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_ */

libs/stb_image/stbi_image.cpp

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

log.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#include "pch.hpp"
+
+#define Log(msg, ...) printf("[%s: %d] " msg, __func__, __LINE__, ## __VA_ARGS__)

main.cpp

@@ -0,0 +1,19 @@
+#include "engine.hpp"
+#include "event.hpp"
+
+int main(int argc, char** argv) {
+    engine.Init("sandbox", Size{720, 480});
+
+    Color color{0.1, 0.1, 0.1, 1};
+    Renderer::SetClearColor(color);
+    while (!engine.ShouldExit()) {
+        Renderer::Clear();
+        engine.PollEvent();
+        engine.Update();
+        engine.Render();
+        engine.SwapContext();
+    }
+
+    engine.Shutdown();
+    return 0;
+}

pch.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "glad/gl.h"
+#include "GLFW/glfw3.h"
+#include "stb_image.h"
+#include <string>
+#include <exception>
+#include <vector>
+#include <iostream>
+#include <memory>
+#include <fstream>

renderer.cpp

@@ -0,0 +1,41 @@
+#include "renderer.hpp"
+
+struct RenderContext {
+
+};
+
+void Renderer::Init() {
+    if (!gladLoadGL(glfwGetProcAddress)) {
+        glfwTerminate();
+        throw std::runtime_error("glad load failed");
+    }
+
+    GL_CALL(glEnable(GL_DEPTH_TEST));
+    GL_CALL(glEnable(GL_STENCIL_TEST));
+}
+
+void Renderer::SetClearColor(const Color& color) {
+    GL_CALL(glClearColor(color.r, color.g, color.b, color.a));
+}
+
+void Renderer::DrawLine(const Point& p1, const Point& p2) {
+}
+
+void Renderer::DrawRect(const Rect& rect) {
+}
+
+void Renderer::FillRect(const Rect& rect) {
+}
+
+void Renderer::SetDrawColor(const Color& color) {
+}
+
+void Renderer::Clear() {
+    GL_CALL(glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT));
+}
+
+void Renderer::SetViewport(int x, int y, int w, int h) {
+    GL_CALL(glViewport(x, y, w, h));
+}
+
+void Renderer::Shutdown() {}

renderer.hpp

@@ -0,0 +1,18 @@
+#pragma once
+#include "libmath.hpp"
+#include "texture.hpp"
+#include "pch.hpp"
+#include "glhelpfunc.hpp"
+
+class Renderer final {
+public:
+    static void Init();
+    static void Shutdown();
+    static void SetClearColor(const Color& color);
+    static void SetDrawColor(const Color& color);
+    static void Clear();
+    static void DrawLine(const Point& p1, const Point& p2);
+    static void DrawRect(const Rect& rect);
+    static void FillRect(const Rect& rect);
+    static void SetViewport(int x, int y, int w, int h);
+};

shader.cpp

@@ -0,0 +1,277 @@
+#include "shader.hpp"
+
+SourceCode::SourceCode(const std::string& code)
+    : code_(code) {}
+
+Shader::ShaderStruct::ShaderStruct(const SourceCode& code, Shader::ShaderStruct::Type type) {
+    if (code.Empty()) { return; }
+    switch (type) {
+        case ShaderStruct::Vertex:
+            Log("compiling vertex shader ...");
+            GL_CALL(shader_ = glCreateShader(GL_VERTEX_SHADER));
+            break;
+        case Fragment:
+            Log("compiling fragment shader ...");
+            GL_CALL(shader_ = glCreateShader(GL_FRAGMENT_SHADER));
+            break;
+        case Geometry:
+            Log("compiling geometry shader ...");
+            GL_CALL(shader_ = glCreateShader(GL_GEOMETRY_SHADER));
+            break;
+    }
+    if (shader_ == 0) {
+        Log("create shader failed");
+    } else {
+        const GLchar* const sources[] = {code.GetCode().c_str()};
+        GL_CALL(glShaderSource(shader_, 1, sources, nullptr));
+        GL_CALL(glCompileShader(shader_));
+        GLint err;
+        GL_CALL(glGetShaderiv(shader_, GL_COMPILE_STATUS, &err));
+        if (err == GL_FALSE) {
+            char buf[1024] = {0};
+            GL_CALL(glGetShaderInfoLog(shader_, sizeof(buf), nullptr, buf));
+            Log("shader compile failed:\n%s", buf);
+        }
+    }
+}
+
+Shader::ShaderStruct::~ShaderStruct() {
+    GL_CALL(glDeleteShader(shader_));
+}
+
+Shader::Shader(const SourceCode* vertex,
+               const SourceCode* fragment,
+               const SourceCode* geometry) {
+    if (vertex) {
+        shaders_[0].reset(new ShaderStruct(*vertex, ShaderStruct::Vertex));
+    }
+    if (fragment) {
+        shaders_[1].reset(new ShaderStruct(*fragment, ShaderStruct::Fragment));
+    }
+    if (geometry) {
+        shaders_[2].reset(new ShaderStruct(*geometry, ShaderStruct::Geometry));
+    }
+
+    GL_CALL(program_ = glCreateProgram());
+    if (program_ == 0) {
+        Log("create shader program failed");
+    } else {
+        for (const auto& shader : shaders_) {
+            if (shader) {
+                GL_CALL(glAttachShader(program_, shader->Get()));
+            }
+        }
+        GL_CALL(glLinkProgram(program_));
+        GLint err;
+        GL_CALL(glGetProgramiv(program_, GL_LINK_STATUS, &err));
+        if (err == GL_FALSE) {
+            char buf[1024] = {0};
+            GL_CALL(glGetProgramInfoLog(program_, sizeof(buf), nullptr, buf));
+            Log("link shader program failed:\n%s", buf);
+        }
+    }
+}
+
+Shader::~Shader() {
+    for (auto& shader : shaders_)
+        shader.reset();
+    GL_CALL(glDeleteProgram(program_));
+}
+
+void Shader::SetInt(const std::string& name, int i) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform1i(loc, i));
+    }
+}
+
+void Shader::SetInt2(const std::string& name, int i1, int i2) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform2i(loc, i1, i2));
+    }
+}
+
+void Shader::SetInt3(const std::string& name, int i1, int i2, int i3) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform3i(loc, i1, i2, i3));
+    }
+}
+
+void Shader::SetInt4(const std::string& name, int i1, int i2, int i3, int i4) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform4i(loc, i1, i2, i3, i4));
+    }
+}
+
+void Shader::SetFloat(const std::string& name, float f) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform1f(loc, f));
+    }
+}
+
+void Shader::SetFloat2(const std::string& name, float f1, float f2) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform2f(loc, f1, f2));
+    }
+}
+
+void Shader::SetFloat3(const std::string& name, float f1, float f2, float f3) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform3f(loc, f1, f2, f3));
+    }
+}
+
+void Shader::SetFloat4(const std::string& name, float f1, float f2, float f3, float f4) {
+    GLint loc;
+    GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+    if (loc == -1) {
+        Log("uniform variable %s is not found", name.c_str());
+    } else {
+        Use();
+        GL_CALL(glUniform4f(loc, f1, f2, f3, f4));
+    }
+}
+
+// void Shader::SetMat4(const std::string& name, const glm::mat4& mat, bool transpose) {
+//     GLint loc;
+//     GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+//     if (loc == -1) {
+//         Log("uniform variable %s is not found", name.c_str());
+//     } else {
+//         Use();
+//         GL_CALL(glUniformMatrix4fv(loc, 1, transpose ? GL_TRUE : GL_FALSE, glm::value_ptr(mat)));
+//     }
+// }
+
+// void Shader::SetFloatVec3(const std::string& name, const glm::vec3& data) {
+//     GLint loc;
+//     GL_CALL(loc = glGetUniformLocation(program_, name.c_str()));
+//     if (loc == -1) {
+//         Log("uniform variable %s is not found", name.c_str());
+//     } else {
+//         Use();
+//         GL_CALL(glUniform3fv(loc, 1, glm::value_ptr(data)));
+//     }
+// }
+
+
+SourceCodePtr CreateSourceCodeFromFile(const std::string& filename) {
+    std::ifstream file(filename);
+    if (file.fail()) {
+        Log("SourceCodeRes %s load failed", filename.c_str());
+        return nullptr;
+    }
+    std::string code((std::istreambuf_iterator<char>(file)),
+                     std::istreambuf_iterator<char>());
+    return CreateSourceCode(code);
+}
+
+void parseShaderFile(const std::string& code,
+                             std::string& vertexCode,
+                             std::string& geometryCode,
+                             std::string& fragmentCode) {
+    std::string::size_type pos[3] = {code.find("#type vertex"),
+                                     code.find("#type geometry"),
+                                     code.find("#type fragment")};
+    /* 1 - vertex shader code
+       2 - tessellation shader code
+       3 - fragment shader code */
+    std::string* codes[3] = {&vertexCode,
+                             &geometryCode,
+                             &fragmentCode};
+
+    // sort three code by their position
+    if (pos[0] > pos[1]) {
+        std::swap(pos[0], pos[1]);
+        std::swap(codes[0], codes[1]);
+    }
+    if (pos[1] > pos[2]) {
+        std::swap(pos[1], pos[2]);
+        std::swap(codes[1], codes[2]);
+    }
+    if (pos[0] > pos[1]) {
+        std::swap(pos[0], pos[1]);
+        std::swap(codes[0], codes[1]);
+    }
+
+    // split file in codes
+    if (pos[0] != std::string::npos) {
+        if (pos[1] != std::string::npos) {
+            std::copy_n(code.begin() + pos[0], pos[1] - pos[0], std::back_inserter(*codes[0]));
+        } else {
+            std::copy(code.begin() + pos[0], code.end(), std::back_inserter(*codes[0]));
+        }
+    }
+    if (pos[1] != std::string::npos) {
+        if (pos[2] != std::string::npos) {
+            std::copy_n(code.begin() + pos[1], pos[2] - pos[1], std::back_inserter(*codes[1]));
+        } else {
+            std::copy(code.begin() + pos[1], code.end(), std::back_inserter(*codes[1]));
+        }
+    }
+    if (pos[2] != std::string::npos) {
+        std::copy(code.begin() + pos[2], code.end(), std::back_inserter(*codes[2]));
+    }
+
+    for (auto& c : codes) {
+        c->erase(0, c->find_first_of('\n'));
+    }
+}
+
+SourceCodeGroup CreateSourceCodeFromGroup(const std::string& code) {
+    std::string vertex, geometry, fragment;
+    parseShaderFile(code, vertex, geometry, fragment);
+    SourceCodeGroup group;
+    if (!vertex.empty())
+        group.vertexCode = CreateSourceCode(vertex);
+    if (!geometry.empty())
+        group.geometryCode = CreateSourceCode(geometry);
+    if (!fragment.empty())
+        group.fragmentCode = CreateSourceCode(fragment);
+    return group;
+}
+
+SourceCodeGroup CreateSourceCodeFromGroupFile(const std::string& filename) {
+    std::ifstream file(filename);
+    if (file.fail()) {
+        Log("SourceCodeRes %s load failed", filename.c_str());
+        return {nullptr, nullptr, nullptr};
+    }
+    std::string code((std::istreambuf_iterator<char>(file)),
+                     std::istreambuf_iterator<char>());
+    return CreateSourceCodeFromGroup(code);
+}

shader.hpp

@@ -0,0 +1,99 @@
+#pragma once
+#include "pch.hpp"
+#include "glhelpfunc.hpp"
+#include "log.hpp"
+#include "tool.hpp"
+
+class SourceCode {
+public:
+    SourceCode(const std::string& code);
+    inline bool Empty() const { return code_.empty(); }
+    inline std::string& GetCode() { return code_; }
+    inline const std::string& GetCode() const { return code_;}
+    inline bool HasCode() const { return !code_.empty(); }
+
+private:
+    std::string code_;
+};
+
+inline std::ostream& operator<<(std::ostream& o, const SourceCode& res) {
+    o << res.GetCode();
+    return o;
+}
+
+class Shader final {
+public:
+    Shader(const SourceCode* vertex,
+           const SourceCode* fragment,
+           const SourceCode* geometry = nullptr);
+    Shader(const Shader&) = delete;
+    ~Shader();
+    Shader& operator=(const Shader&) = delete;
+
+    inline bool Valid() const { return program_ != 0; }
+    GLuint Get() const { return program_; }
+
+    void SetInt(const std::string& name, int i);
+    void SetInt2(const std::string& name, int i1, int i2);
+    void SetInt3(const std::string& name, int i1, int i2, int i3);
+    void SetInt4(const std::string& name, int i1, int i2, int i3, int i4);
+    void SetFloat(const std::string& name, float f);
+    void SetFloat2(const std::string& name, float f1, float f2);
+    void SetFloat3(const std::string& name, float f1, float f2, float f3);
+    void SetFloat4(const std::string& name, float f1, float f2, float f3, float f4);
+    // void SetMat4(const std::string& name, const glm::mat4& mat, bool transpose = false);
+    // void SetFloatVec3(const std::string& name, const glm::vec3&);
+
+    inline void Use() const { GL_CALL(glUseProgram(program_)); }
+
+private:
+    class ShaderStruct final {
+    public:
+        enum Type {
+            Vertex,
+            Fragment,
+            Geometry,
+        };
+        ShaderStruct(const SourceCode& code, Type type);
+        ~ShaderStruct();
+        ShaderStruct(const Shader&) = delete;
+        Shader& operator=(const Shader&) = delete;
+
+        inline bool Valid() const { return shader_ != 0; }
+
+        GLuint Get() const { return shader_; }
+
+    private:
+        GLuint shader_;
+    };
+
+    GLuint program_;
+    Unique<ShaderStruct> shaders_[3];
+};
+
+using SourceCodePtr = Ref<SourceCode>;
+using ShaderPtr = Ref<Shader>;
+
+struct SourceCodeGroup {
+    SourceCodePtr vertexCode = nullptr;
+    SourceCodePtr geometryCode = nullptr;
+    SourceCodePtr fragmentCode = nullptr;
+};
+
+inline SourceCodePtr CreateSourceCode(const std::string& code) {
+    if (code.empty()) {
+        Log("source code is empty");
+        return nullptr;
+    }
+    return SourceCodePtr(new SourceCode(code));
+}
+
+SourceCodePtr CreateSourceCodeFromFile(const std::string& filename);
+SourceCodeGroup CreateSourceCodeFromGroup(const std::string& code);
+SourceCodeGroup CreateSourceCodeFromGroupFile(const std::string& filename);
+
+inline ShaderPtr CreateShader(const SourceCode* vertex,
+                              const SourceCode* fragment,
+                              const SourceCode* geometry = nullptr) {
+    return ShaderPtr(new Shader(vertex, fragment, geometry));
+}

texture.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+class Texture {
+// TODO implement your own texture
+};

tool.hpp

@@ -0,0 +1,8 @@
+#pragma once
+#include "pch.hpp"
+
+template <typename T>
+using Unique = std::unique_ptr<T>;
+
+template <typename T>
+using Ref = std::shared_ptr<T>;