#pragma once
#include "glcorearb.h"

typedef HGLRC (APIENTRYP PFNWGLCREATECONTEXT)(HDC);
typedef BOOL (APIENTRYP PFNWGLDELETECONTEXT)(HGLRC);
typedef PROC (APIENTRYP PFNWGLGETPROCADDRESS)(LPCSTR);
typedef BOOL (APIENTRYP PFNWGLMAKECURRENT)(HDC, HGLRC);

extern PFNWGLCREATECONTEXT xwglCreateContext;
extern PFNWGLDELETECONTEXT xwglDeleteContext;
extern PFNWGLGETPROCADDRESS xwglGetProcAddress;
extern PFNWGLMAKECURRENT xwglMakeCurrent;

typedef void (APIENTRYP PFNGLVIEWPORT)(GLint x, GLint y, GLsizei width, GLsizei height);
typedef void (APIENTRYP PFNGLBINDTEXTURE)(GLenum target, GLuint texture);
typedef void (APIENTRYP PFNGLGENTEXTURES)(GLsizei n, GLuint *textures);
typedef void (APIENTRYP PFNGLTEXPARAMETERI)(GLenum target, GLenum pname, GLint param);
typedef void (APIENTRYP PFNGLDELETETEXTURES)(GLsizei n, const GLuint *textures);
typedef void (APIENTRYP PFNGLTEXIMAGE2D)(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
typedef void (APIENTRYP PFNGLDRAWELEMENTS)(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices);
typedef void (APIENTRYP PFNGLTEXSUBIMAGE2D)(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels);
typedef GLenum (APIENTRYP PFNGLGETERROR)(void);
typedef const GLubyte * (APIENTRYP PFNGLGETSTRING)(GLenum name);
typedef void (APIENTRYP PFNGLGETTEXIMAGE)(GLenum target, GLint level, GLenum format, GLenum type, GLvoid *pixels);
typedef void (APIENTRYP PFNGLPIXELSTOREI)(GLenum pname, GLint param);

extern PFNGLVIEWPORT glViewport;
extern PFNGLBINDTEXTURE glBindTexture;
extern PFNGLGENTEXTURES glGenTextures;
extern PFNGLTEXPARAMETERI glTexParameteri;
extern PFNGLDELETETEXTURES glDeleteTextures;
extern PFNGLTEXIMAGE2D glTexImage2D;
extern PFNGLDRAWELEMENTS glDrawElements;
extern PFNGLTEXSUBIMAGE2D glTexSubImage2D;
extern PFNGLGETERROR glGetError;
extern PFNGLGETSTRING glGetString;
extern PFNGLGETTEXIMAGE glGetTexImage;
extern PFNGLPIXELSTOREI glPixelStorei;

//compat profile only --->
#define GL_LUMINANCE                      0x1909
#define GL_LUMINANCE8                     0x8040
typedef void (APIENTRYP PFNGLBEGIN)(GLenum mode);
typedef void (APIENTRYP PFNGLEND)(void);
typedef void (APIENTRYP PFNGLTEXCOORD2F)(GLfloat s, GLfloat t);
typedef void (APIENTRYP PFNGLVERTEX2F)(GLfloat x, GLfloat y);

extern PFNGLBEGIN glBegin;
extern PFNGLEND glEnd;
extern PFNGLTEXCOORD2F glTexCoord2f;
extern PFNGLVERTEX2F glVertex2f;
// <--- compat profile only


BOOL OpenGL_LoadDll();
void OpenGL_Init();
BOOL OpenGL_ExtExists(char *ext, HDC hdc);
GLuint OpenGL_BuildProgram(const GLchar *vertSource, const GLchar *fragSource);
GLuint OpenGL_BuildProgramFromFile(const char *filePath);

typedef void (APIENTRYP PFNWGLSWAPINTERVALEXT) (int interval);
typedef const char* (WINAPI *PFNWGLGETEXTENSIONSSTRINGARBPROC)(HDC hdc);

extern PFNGLCREATEPROGRAMPROC glCreateProgram;
extern PFNGLDELETEPROGRAMPROC glDeleteProgram;
extern PFNGLUSEPROGRAMPROC glUseProgram;
extern PFNGLATTACHSHADERPROC glAttachShader;
extern PFNGLDETACHSHADERPROC glDetachShader;
extern PFNGLLINKPROGRAMPROC glLinkProgram;
extern PFNGLGETPROGRAMIVPROC glGetProgramiv;
extern PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
extern PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
extern PFNGLUNIFORM1IPROC glUniform1i;
extern PFNGLUNIFORM1IVPROC glUniform1iv;
extern PFNGLUNIFORM2IVPROC glUniform2iv;
extern PFNGLUNIFORM3IVPROC glUniform3iv;
extern PFNGLUNIFORM4IVPROC glUniform4iv;
extern PFNGLUNIFORM1FPROC glUniform1f;
extern PFNGLUNIFORM1FVPROC glUniform1fv;
extern PFNGLUNIFORM2FVPROC glUniform2fv;
extern PFNGLUNIFORM3FVPROC glUniform3fv;
extern PFNGLUNIFORM4FVPROC glUniform4fv;
extern PFNGLUNIFORM4FPROC glUniform4f;
extern PFNGLUNIFORMMATRIX4FVPROC glUniformMatrix4fv;
extern PFNGLGETATTRIBLOCATIONPROC glGetAttribLocation;
extern PFNGLVERTEXATTRIB1FPROC glVertexAttrib1f;
extern PFNGLVERTEXATTRIB1FVPROC glVertexAttrib1fv;
extern PFNGLVERTEXATTRIB2FVPROC glVertexAttrib2fv;
extern PFNGLVERTEXATTRIB3FVPROC glVertexAttrib3fv;
extern PFNGLVERTEXATTRIB4FVPROC glVertexAttrib4fv;
extern PFNGLENABLEVERTEXATTRIBARRAYPROC glEnableVertexAttribArray;
extern PFNGLDISABLEVERTEXATTRIBARRAYPROC glDisableVertexAttribArray;
extern PFNGLBINDATTRIBLOCATIONPROC glBindAttribLocation;
extern PFNGLGETACTIVEUNIFORMPROC glGetActiveUniform;

extern PFNGLCREATESHADERPROC glCreateShader;
extern PFNGLDELETESHADERPROC glDeleteShader;
extern PFNGLSHADERSOURCEPROC glShaderSource;
extern PFNGLCOMPILESHADERPROC glCompileShader;
extern PFNGLGETSHADERIVPROC glGetShaderiv;

extern PFNGLGENBUFFERSPROC glGenBuffers;
extern PFNGLBINDBUFFERPROC	glBindBuffer;
extern PFNGLBUFFERDATAPROC	glBufferData;
extern PFNGLMAPBUFFERPROC glMapBuffer;
extern PFNGLUNMAPBUFFERPROC glUnmapBuffer;
extern PFNGLBUFFERSUBDATAPROC glBufferSubData;
extern PFNGLVERTEXATTRIBPOINTERPROC glVertexAttribPointer;
extern PFNGLDELETEBUFFERSPROC glDeleteBuffers;
extern PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
extern PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
extern PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays;

extern PFNGLACTIVETEXTUREPROC glActiveTexture;

extern PFNGLGENFRAMEBUFFERSPROC glGenFramebuffers;
extern PFNGLBINDFRAMEBUFFERPROC glBindFramebuffer;
extern PFNGLFRAMEBUFFERTEXTURE2DPROC glFramebufferTexture2D;
extern PFNGLDRAWBUFFERSPROC glDrawBuffers;
extern PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus;
extern PFNGLDELETEFRAMEBUFFERSPROC glDeleteFramebuffers;

extern PFNWGLSWAPINTERVALEXT wglSwapIntervalEXT;
extern PFNWGLGETEXTENSIONSSTRINGARBPROC wglGetExtensionsStringARB;

extern PFNGLTEXBUFFERPROC glTexBuffer;

extern HMODULE OpenGL_hModule;

extern BOOL OpenGL_GotVersion2;
extern BOOL OpenGL_GotVersion3;

extern char OpenGL_Version[];