104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
//========================================================================
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// GLFW - An OpenGL framework
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// File: win32_glext.c
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// Platform: Windows
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// API version: 2.6
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// WWW: http://glfw.sourceforge.net
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Camilla Berglund
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//------------------------------------------------------------------------
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// $Id: win32_glext.c,v 1.7 2007/04/15 22:54:40 elmindreda Exp $
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//========================================================================
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#include "internal.h"
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//========================================================================
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// We use the WGL_EXT_extensions_string if it is available, or
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// WGL_ARB_extensions_string if it is available.
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//========================================================================
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typedef const char *(APIENTRY * WGLGETEXTENSIONSSTRINGEXT_T)( void );
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typedef const char *(APIENTRY * WGLGETEXTENSIONSSTRINGARB_T)( HDC hdc );
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//************************************************************************
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//**** Platform implementation functions ****
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//************************************************************************
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//========================================================================
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// Check if an OpenGL extension is available at runtime (Windows version checks
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// for WGL extensions)
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//========================================================================
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int _glfwPlatformExtensionSupported( const char *extension )
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{
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const GLubyte *extensions;
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WGLGETEXTENSIONSSTRINGEXT_T _wglGetExtensionsStringEXT;
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WGLGETEXTENSIONSSTRINGARB_T _wglGetExtensionsStringARB;
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// Try wglGetExtensionsStringEXT
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_wglGetExtensionsStringEXT = (WGLGETEXTENSIONSSTRINGEXT_T)
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wglGetProcAddress( "wglGetExtensionsStringEXT" );
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if( _wglGetExtensionsStringEXT != NULL )
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{
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extensions = (GLubyte *) _wglGetExtensionsStringEXT();
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if( extensions != NULL )
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{
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if( _glfwStringInExtensionString( extension, extensions ) )
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{
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return GL_TRUE;
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}
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}
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}
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// Try wglGetExtensionsStringARB
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_wglGetExtensionsStringARB = (WGLGETEXTENSIONSSTRINGARB_T)
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wglGetProcAddress( "wglGetExtensionsStringARB" );
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if( _wglGetExtensionsStringARB != NULL )
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{
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extensions = (GLubyte *) _wglGetExtensionsStringARB(_glfwWin.DC);
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if( extensions != NULL )
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{
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if( _glfwStringInExtensionString( extension, extensions ) )
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{
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return GL_TRUE;
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}
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}
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}
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return GL_FALSE;
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}
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//========================================================================
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// Get the function pointer to an OpenGL function
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//========================================================================
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void * _glfwPlatformGetProcAddress( const char *procname )
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{
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return (void *) wglGetProcAddress( procname );
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}
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