glfw/lib/x11/x11_glext.c

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//========================================================================
// GLFW - An OpenGL framework
// Platform: X11/GLX
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// API version: 3.0
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// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
void (*glXGetProcAddress(const GLubyte *procName))();
void (*glXGetProcAddressARB(const GLubyte *procName))();
void (*glXGetProcAddressEXT(const GLubyte *procName))();
// We support four different ways for getting addresses for GL/GLX
// extension functions: glXGetProcAddress, glXGetProcAddressARB,
// glXGetProcAddressEXT, and dlsym
#if defined( _GLFW_HAS_GLXGETPROCADDRESSARB )
#define _glfw_glXGetProcAddress(x) glXGetProcAddressARB(x)
#elif defined( _GLFW_HAS_GLXGETPROCADDRESS )
#define _glfw_glXGetProcAddress(x) glXGetProcAddress(x)
#elif defined( _GLFW_HAS_GLXGETPROCADDRESSEXT )
#define _glfw_glXGetProcAddress(x) glXGetProcAddressEXT(x)
#elif defined( _GLFW_HAS_DLOPEN )
#define _glfw_glXGetProcAddress(x) dlsym(_glfwLibs.libGL,x)
#define _GLFW_DLOPEN_LIBGL
#else
#define _glfw_glXGetProcAddress(x) NULL
#endif
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
//========================================================================
// Check if an OpenGL extension is available at runtime
//========================================================================
int _glfwPlatformExtensionSupported( const char *extension )
{
const GLubyte *extensions;
// Get list of GLX extensions
extensions = (const GLubyte*) glXQueryExtensionsString( _glfwLibrary.display,
_glfwWin.screen );
if( extensions != NULL )
{
if( _glfwStringInExtensionString( extension, extensions ) )
return GL_TRUE;
}
return GL_FALSE;
}
//========================================================================
// Get the function pointer to an OpenGL function
//========================================================================
void * _glfwPlatformGetProcAddress( const char *procname )
{
return (void *) _glfw_glXGetProcAddress( (const GLubyte *) procname );
}