/* -LICENSE-START-
 ** Copyright (c) 2012 Blackmagic Design
 **  
 ** Permission is hereby granted, free of charge, to any person or organization 
 ** obtaining a copy of the software and accompanying documentation (the 
 ** "Software") to use, reproduce, display, distribute, sub-license, execute, 
 ** and transmit the Software, and to prepare derivative works of the Software, 
 ** and to permit third-parties to whom the Software is furnished to do so, in 
 ** accordance with:
 ** 
 ** (1) if the Software is obtained from Blackmagic Design, the End User License 
 ** Agreement for the Software Development Kit ("EULA") available at 
 ** https://www.blackmagicdesign.com/EULA/DeckLinkSDK; or
 ** 
 ** (2) if the Software is obtained from any third party, such licensing terms 
 ** as notified by that third party,
 ** 
 ** and all subject to the following:
 ** 
 ** (3) the copyright notices in the Software and this entire statement, 
 ** including the above license grant, this restriction and the following 
 ** disclaimer, must be included in all copies of the Software, in whole or in 
 ** part, and all derivative works of the Software, unless such copies or 
 ** derivative works are solely in the form of machine-executable object code 
 ** generated by a source language processor.
 ** 
 ** (4) THE SOFTWARE IS 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT 
 ** SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 
 ** FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 
 ** ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 ** DEALINGS IN THE SOFTWARE.
 ** 
 ** A copy of the Software is available free of charge at 
 ** https://www.blackmagicdesign.com/desktopvideo_sdk under the EULA.
 ** 
 ** -LICENSE-END-
 */
//
//  GLExtensions.cpp
//  LoopThroughWithOpenGLCompositing
//

#include "GLExtensions.h"

PFNGLGENFRAMEBUFFERSPROC glGenFramebuffers;
PFNGLGENRENDERBUFFERSPROC glGenRenderbuffers;
PFNGLBINDRENDERBUFFERPROC glBindRenderbuffer;
PFNGLRENDERBUFFERSTORAGEPROC glRenderbufferStorage;
PFNGLDELETEFRAMEBUFFERSPROC glDeleteFramebuffers;
PFNGLDELETERENDERBUFFERSPROC glDeleteRenderbuffers;
PFNGLBINDFRAMEBUFFERPROC glBindFramebuffer;
PFNGLFRAMEBUFFERTEXTURE2DPROC glFramebufferTexture2D;
PFNGLFRAMEBUFFERRENDERBUFFERPROC glFramebufferRenderbuffer;
PFNGLCHECKFRAMEBUFFERSTATUSPROC glCheckFramebufferStatus;
PFNGLBLITFRAMEBUFFERPROC glBlitFramebuffer;
PFNGLFENCESYNCPROC glFenceSync;
PFNGLCLIENTWAITSYNCPROC glClientWaitSync;
PFNGLDELETESYNCPROC glDeleteSync;
PFNGLGENBUFFERSPROC glGenBuffers;
PFNGLDELETEBUFFERSPROC glDeleteBuffers;
PFNGLBINDBUFFERPROC glBindBuffer;
PFNGLBUFFERDATAPROC glBufferData;
PFNGLBUFFERSUBDATAPROC glBufferSubData;
PFNGLBINDBUFFERBASEPROC glBindBufferBase;
PFNGLACTIVETEXTUREPROC glActiveTexture;
PFNGLGENVERTEXARRAYSPROC glGenVertexArrays;
PFNGLDELETEVERTEXARRAYSPROC glDeleteVertexArrays;
PFNGLBINDVERTEXARRAYPROC glBindVertexArray;
PFNGLCREATESHADERPROC glCreateShader;
PFNGLDELETESHADERPROC glDeleteShader;
PFNGLDELETEPROGRAMPROC glDeleteProgram;
PFNGLSHADERSOURCEPROC glShaderSource;
PFNGLCOMPILESHADERPROC glCompileShader;
PFNGLGETSHADERIVPROC glGetShaderiv;
PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
PFNGLCREATEPROGRAMPROC glCreateProgram;
PFNGLATTACHSHADERPROC glAttachShader;
PFNGLLINKPROGRAMPROC glLinkProgram;
PFNGLGETPROGRAMIVPROC glGetProgramiv;
PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;
PFNGLUSEPROGRAMPROC glUseProgram;
PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
PFNGLGETUNIFORMBLOCKINDEXPROC glGetUniformBlockIndex;
PFNGLUNIFORMBLOCKBINDINGPROC glUniformBlockBinding;
PFNGLUNIFORM1IPROC glUniform1i;
PFNGLUNIFORM1FPROC glUniform1f;
PFNGLUNIFORM2FPROC glUniform2f;
PFNGLUNIFORM4FPROC glUniform4f;

bool ResolveGLExtensions()
{
	glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC) wglGetProcAddress("glGenFramebuffers");
	if (!glGenFramebuffers)
		glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC) wglGetProcAddress("glGenFramebuffersEXT");
	glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC) wglGetProcAddress("glGenRenderbuffers");
	if (!glGenRenderbuffers)
		glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC) wglGetProcAddress("glGenRenderbuffersEXT");
	glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC) wglGetProcAddress("glBindRenderbuffer");
	if (!glBindRenderbuffer)
		glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC) wglGetProcAddress("glBindRenderbufferEXT");
	glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC) wglGetProcAddress("glRenderbufferStorage");
	if (!glRenderbufferStorage)
		glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC) wglGetProcAddress("glRenderbufferStorageEXT");
	glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC) wglGetProcAddress("glDeleteFramebuffers");
	if (!glDeleteFramebuffers)
		glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC) wglGetProcAddress("glDeleteFramebuffersEXT");
	glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC) wglGetProcAddress("glDeleteRenderbuffers");
	if (!glDeleteRenderbuffers)
		glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC) wglGetProcAddress("glDeleteRenderbuffersEXT");
	glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC) wglGetProcAddress("glBindFramebuffer");
	if (!glBindFramebuffer)
		glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC) wglGetProcAddress("glBindFramebufferEXT");
	glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC) wglGetProcAddress("glFramebufferTexture2D");
	if (!glFramebufferTexture2D)
		glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC) wglGetProcAddress("glFramebufferTexture2DEXT");
	glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC) wglGetProcAddress("glFramebufferRenderbuffer");
	if (!glFramebufferRenderbuffer)
		glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC) wglGetProcAddress("glFramebufferRenderbufferEXT");
	glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC) wglGetProcAddress("glCheckFramebufferStatus");
	if (!glCheckFramebufferStatus)
		glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC) wglGetProcAddress("glCheckFramebufferStatusEXT");
	glBlitFramebuffer = (PFNGLBLITFRAMEBUFFERPROC) wglGetProcAddress("glBlitFramebuffer");
	if (!glBlitFramebuffer)
		glBlitFramebuffer = (PFNGLBLITFRAMEBUFFERPROC) wglGetProcAddress("glBlitFramebufferEXT");
	glFenceSync = (PFNGLFENCESYNCPROC) wglGetProcAddress("glFenceSync");
	glClientWaitSync = (PFNGLCLIENTWAITSYNCPROC) wglGetProcAddress("glClientWaitSync");
	glDeleteSync = (PFNGLDELETESYNCPROC) wglGetProcAddress("glDeleteSync");
	glGenBuffers = (PFNGLGENBUFFERSPROC) wglGetProcAddress("glGenBuffers");
	glDeleteBuffers = (PFNGLDELETEBUFFERSPROC) wglGetProcAddress("glDeleteBuffers");
	glBindBuffer = (PFNGLBINDBUFFERPROC) wglGetProcAddress("glBindBuffer");
	glBufferData = (PFNGLBUFFERDATAPROC) wglGetProcAddress("glBufferData");
	glBufferSubData = (PFNGLBUFFERSUBDATAPROC) wglGetProcAddress("glBufferSubData");
	glBindBufferBase = (PFNGLBINDBUFFERBASEPROC) wglGetProcAddress("glBindBufferBase");
	glActiveTexture = (PFNGLACTIVETEXTUREPROC) wglGetProcAddress("glActiveTexture");
	glGenVertexArrays = (PFNGLGENVERTEXARRAYSPROC) wglGetProcAddress("glGenVertexArrays");
	glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSPROC) wglGetProcAddress("glDeleteVertexArrays");
	glBindVertexArray = (PFNGLBINDVERTEXARRAYPROC) wglGetProcAddress("glBindVertexArray");
	glCreateShader = (PFNGLCREATESHADERPROC) wglGetProcAddress("glCreateShader");
	glDeleteShader = (PFNGLDELETESHADERPROC) wglGetProcAddress("glDeleteShader");
	glDeleteProgram = (PFNGLDELETEPROGRAMPROC) wglGetProcAddress("glDeleteProgram");
	glShaderSource = (PFNGLSHADERSOURCEPROC) wglGetProcAddress("glShaderSource");
	glCompileShader = (PFNGLCOMPILESHADERPROC) wglGetProcAddress("glCompileShader");
	glGetShaderiv = (PFNGLGETSHADERIVPROC) wglGetProcAddress("glGetShaderiv");
	glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC) wglGetProcAddress("glGetShaderInfoLog");
	glCreateProgram = (PFNGLCREATEPROGRAMPROC) wglGetProcAddress("glCreateProgram");
	glAttachShader = (PFNGLATTACHSHADERPROC) wglGetProcAddress("glAttachShader");
	glLinkProgram = (PFNGLLINKPROGRAMPROC) wglGetProcAddress("glLinkProgram");
	glGetProgramiv = (PFNGLGETPROGRAMIVPROC) wglGetProcAddress("glGetProgramiv");
	glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC) wglGetProcAddress("glGetProgramInfoLog");
	glUseProgram = (PFNGLUSEPROGRAMPROC) wglGetProcAddress("glUseProgram");
	glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) wglGetProcAddress("glGetUniformLocation");
	glGetUniformBlockIndex = (PFNGLGETUNIFORMBLOCKINDEXPROC) wglGetProcAddress("glGetUniformBlockIndex");
	glUniformBlockBinding = (PFNGLUNIFORMBLOCKBINDINGPROC) wglGetProcAddress("glUniformBlockBinding");
	glUniform1i = (PFNGLUNIFORM1IPROC) wglGetProcAddress("glUniform1i");
	glUniform1f = (PFNGLUNIFORM1FPROC) wglGetProcAddress("glUniform1f");
	glUniform2f = (PFNGLUNIFORM2FPROC) wglGetProcAddress("glUniform2f");
	glUniform4f = (PFNGLUNIFORM4FPROC) wglGetProcAddress("glUniform4f");

	return	glGenFramebuffers
			&& glGenRenderbuffers
			&& glBindRenderbuffer
			&& glRenderbufferStorage
			&& glDeleteFramebuffers
			&& glDeleteRenderbuffers
			&& glBindFramebuffer
			&& glFramebufferTexture2D
			&& glFramebufferRenderbuffer
			&& glCheckFramebufferStatus
			&& glBlitFramebuffer
			&& glFenceSync
			&& glClientWaitSync
			&& glDeleteSync
			&& glGenBuffers
			&& glDeleteBuffers
			&& glBindBuffer
			&& glBufferData
			&& glBufferSubData
			&& glBindBufferBase
			&& glActiveTexture
			&& glGenVertexArrays
			&& glDeleteVertexArrays
			&& glBindVertexArray
			&& glCreateShader
			&& glDeleteShader
			&& glDeleteProgram
			&& glShaderSource
			&& glCompileShader
			&& glGetShaderiv
			&& glGetShaderInfoLog
			&& glCreateProgram
			&& glAttachShader
			&& glLinkProgram
			&& glGetProgramiv
			&& glGetProgramInfoLog
			&& glUseProgram
			&& glGetUniformLocation
			&& glGetUniformBlockIndex
			&& glUniformBlockBinding
			&& glUniform1i
			&& glUniform1f
			&& glUniform2f
			&& glUniform4f
			;
}