#pragma once


#include "SDL.h"
#ifdef EMSCRIPTEN
//#define GL_GLEXT_PROTOTYPES 1
//#define EGL_EGLEXT_PROTOTYPES 1
//#include <SDL2/SDL_opengl.h>
#include <GLES3/gl3.h>
#include "emscripten.h"
#endif

#ifdef __linux__
#include <GL/gl.h>
#include <GL/glu.h>
#include <GLES3/gl3.h>

#endif

#include <exception>
#include <stdexcept>
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)

#include "windows.h"

#define GET_X_LPARAM(lp)                        ((int)(short)LOWORD(lp))
#define GET_Y_LPARAM(lp)                        ((int)(short)HIWORD(lp))

//#define GL_GLEXT_PROTOTYPES

#include "gl/gl.h"
#include "gl/glu.h"
#include "gl/glext.h"


#include <memory>
#include <vector>
#include <array>
#include <stack>
#include <unordered_map>
#include <map>
#define _USE_MATH_DEFINES
#include <math.h>

//Requires GL_VERSION_2_0
extern PFNGLCREATEPROGRAMPROC glCreateProgram;
extern PFNGLDELETEPROGRAMPROC glDeleteProgram;
extern PFNGLLINKPROGRAMPROC glLinkProgram;
extern PFNGLVALIDATEPROGRAMPROC glValidateProgram;
extern PFNGLUSEPROGRAMPROC glUseProgram;
extern PFNGLGETPROGRAMIVPROC glGetProgramiv;
extern PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;
extern PFNGLCREATESHADERPROC glCreateShader;
extern PFNGLDELETESHADERPROC glDeleteShader;
extern PFNGLSHADERSOURCEPROC glShaderSource;
extern PFNGLCOMPILESHADERPROC glCompileShader;
extern PFNGLATTACHSHADERPROC glAttachShader;
extern PFNGLDETACHSHADERPROC glDetachShader;
extern PFNGLGETSHADERIVPROC glGetShaderiv;
extern PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
extern PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation;
extern PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer;
extern PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray;
extern PFNGLDISABLEVERTEXATTRIBARRAYPROC glDisableVertexAttribArray;
extern PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
extern PFNGLUNIFORMMATRIX3FVPROC glUniformMatrix3fv;
extern PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv;
extern PFNGLUNIFORM1IPROC glUniform1i;
extern PFNGLUNIFORM1FVPROC glUniform1fv;
extern PFNGLUNIFORM3FVPROC glUniform2fv;
extern PFNGLUNIFORM3FVPROC glUniform3fv;
extern PFNGLUNIFORM4FVPROC glUniform4fv;
extern PFNGLVERTEXATTRIB1FPROC glVertexAttrib1f;
extern PFNGLVERTEXATTRIB2FPROC glVertexAttrib2f;
extern PFNGLVERTEXATTRIB3FPROC glVertexAttrib3f;
extern PFNGLVERTEXATTRIB4FPROC glVertexAttrib4f;
extern PFNGLVERTEXATTRIB2FVPROC glVertexAttrib2fv;
extern PFNGLVERTEXATTRIB3FVPROC glVertexAttrib3fv;
extern PFNGLVERTEXATTRIB4FVPROC glVertexAttrib4fv;
extern PFNGLGETACTIVEATTRIBPROC glGetActiveAttrib;
extern PFNGLGETACTIVEUNIFORMPROC glGetActiveUniform;


//=======================================
//=========== Multitexture ==============
//=======================================

//Requires GL version 1.3
extern PFNGLACTIVETEXTUREPROC glActiveTexture;

//=======================================
//========== Vertex buffer ==============
//=======================================

//Requires GL_VERSION_1_5
extern PFNGLGENBUFFERSPROC glGenBuffers;
extern PFNGLDELETEBUFFERSPROC glDeleteBuffers;
extern PFNGLBINDBUFFERPROC glBindBuffer;
extern PFNGLBUFFERDATAPROC glBufferData;
extern PFNGLBUFFERSUBDATAPROC glBufferSubData;
extern PFNGLMAPBUFFERPROC glMapBuffer;
extern PFNGLUNMAPBUFFERPROC glUnmapBuffer;

//=========================================
//============ Frame buffer ===============
//=========================================

//Requires GL_ARB_framebuffer_object
extern PFNGLISRENDERBUFFERPROC glIsRenderbuffer;
extern PFNGLBINDRENDERBUFFERPROC glBindRenderbuffer;
extern PFNGLDELETERENDERBUFFERSPROC glDeleteRenderbuffers;
extern PFNGLGENRENDERBUFFERSPROC glGenRenderbuffers;
extern PFNGLRENDERBUFFERSTORAGEPROC glRenderbufferStorage;
extern PFNGLGETRENDERBUFFERPARAMETERIVPROC glGetRenderbufferParameteriv;
extern PFNGLISFRAMEBUFFERPROC glIsFramebuffer;
extern PFNGLBINDFRAMEBUFFERPROC glBindFramebuffer;
extern PFNGLDELETEFRAMEBUFFERSPROC glDeleteFramebuffers;
extern PFNGLGENFRAMEBUFFERSPROC glGenFramebuffers;
extern PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus;
extern PFNGLFRAMEBUFFERTEXTURE1DPROC glFramebufferTexture1D;
extern PFNGLFRAMEBUFFERTEXTURE2DPROC glFramebufferTexture2D;
extern PFNGLFRAMEBUFFERTEXTURE3DPROC glFramebufferTexture3D;
extern PFNGLFRAMEBUFFERRENDERBUFFERPROC glFramebufferRenderbuffer;
extern PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVPROC glGetFramebufferAttachmentParameteriv;
extern PFNGLBLITFRAMEBUFFERPROC glBlitFramebuffer;
extern PFNGLRENDERBUFFERSTORAGEMULTISAMPLEPROC glRenderbufferStorageMultisample;
extern PFNGLGENERATEMIPMAPPROC glGenerateMipmap;
extern PFNGLFRAMEBUFFERTEXTURELAYERPROC glFramebufferTextureLayer;



//===========================================
//============ Uniform buffer ===============
//===========================================

//Requires GL_ARB_uniform_buffer_object
extern PFNGLGETUNIFORMINDICESPROC glGetUniformIndices;
extern PFNGLGETACTIVEUNIFORMSIVPROC glGetActiveUniformsiv;
extern PFNGLGETACTIVEUNIFORMNAMEPROC glGetActiveUniformName;
extern PFNGLGETUNIFORMBLOCKINDEXPROC glGetUniformBlockIndex;
extern PFNGLGETACTIVEUNIFORMBLOCKIVPROC glGetActiveUniformBlockiv;
extern PFNGLGETACTIVEUNIFORMBLOCKNAMEPROC glGetActiveUniformBlockName;
extern PFNGLUNIFORMBLOCKBINDINGPROC glUniformBlockBinding;
extern PFNGLBINDBUFFERBASEPROC glBindBufferBase;


extern PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
extern PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
extern PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArray;
#else

#endif
namespace ZL {



	bool BindOpenGlFunctions();

	void CheckGlError();
}