058ef0dc98
and a fix to osg::State's secondary color code from Bob Kuehne. Moved the body of the getGLExtensionFuncPtr() into the header to help out support for Windows mapping of different OpenGL extensions function ptr per dll.
74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_GLEXTENSIONS
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#define OSG_GLEXTENSIONS 1
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#include <osg/Export>
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#if defined(WIN32)
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#include <windows.h>
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#elif defined(__DARWIN_OSX__)
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#include <mach-o/dyld.h>
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#else
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#include <dlfcn.h>
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#endif
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namespace osg {
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/** return true if OpenGL "extension" is supported.
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* note: Must only called within a valid OpenGL context,
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* undefined behavior may occur otherwise.
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*/
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SG_EXPORT extern const bool isGLExtensionSupported(const char *extension);
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/** return the address of the specified OpenGL function.
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* return NULL if function not supported by OpenGL library.
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* Note, glGLExtensionFuncPtr is declared inline so that the code
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* is compiled localy to the calling code. This should get by Windows
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* dumb implementation of having different GL function ptr's for each
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* library when links to it.
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*/
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inline void* getGLExtensionFuncPtr(const char *funcName)
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{
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#if defined(WIN32)
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return wglGetProcAddress(funcName);
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#elif defined(__DARWIN_OSX__)
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std::string temp( "_" );
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temp += funcName; // Mac OS X prepends an underscore on function names
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if ( NSIsSymbolNameDefined( temp.c_str() ) )
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{
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NSSymbol symbol = NSLookupAndBindSymbol( temp.c_str() );
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return NSAddressOfSymbol( symbol );
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} else
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return NULL;
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#else // all other unixes
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// Note: although we use shl_load() etc. for Plugins on HP-UX, it's
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// not neccessary here since we only used them because library
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// intialization was not taking place with dlopen() which renders
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// Plugins useless on HP-UX.
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static void *lib = dlopen("libGL.so", RTLD_LAZY);
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if (lib)
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return dlsym(lib, funcName);
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else
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return NULL;
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#endif
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}
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/** return the address of the specified OpenGL function, if not found then
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* check a second function name, if this fails then return NULL as function is
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* not supported by OpenGL library. This is usual for checking something
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* like glActiveTexture (which is in OGL1.3) or glActiveTextureARB.
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*/
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inline void* getGLExtensionFuncPtr(const char *funcName,const char *fallbackFuncName)
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{
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void* ptr = getGLExtensionFuncPtr(funcName);
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if (ptr) return ptr;
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return getGLExtensionFuncPtr(fallbackFuncName);
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}
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}
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#endif
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