81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
#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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#include <osg/GL>
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#include <osg/GLExtensions>
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#include <osg/Notify>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <string>
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#include <vector>
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#include <set>
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const bool osg::isGLExtensionSupported(const char *extension)
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{
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typedef std::set<std::string> ExtensionSet;
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static ExtensionSet s_extensionSet;
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static const char* s_extensions = NULL;
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if (s_extensions==NULL)
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{
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// get the extension list from OpenGL.
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s_extensions = (const char*)glGetString(GL_EXTENSIONS);
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if (s_extensions==NULL) return false;
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// insert the ' ' delimiated extensions words into the extensionSet.
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const char *startOfWord = s_extensions;
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const char *endOfWord;
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while ((endOfWord = strchr(startOfWord,' '))!=NULL)
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{
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s_extensionSet.insert(std::string(startOfWord,endOfWord));
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startOfWord = endOfWord+1;
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}
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if (*startOfWord!=0) s_extensionSet.insert(std::string(startOfWord));
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osg::notify(INFO)<<"OpenGL extensions supported by installed OpenGL drivers are:"<<std::endl;
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for(ExtensionSet::iterator itr=s_extensionSet.begin();
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itr!=s_extensionSet.end();
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++itr)
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{
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osg::notify(INFO)<<" "<<*itr<<std::endl;
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}
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}
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// true if extension found in extensionSet.
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bool result = s_extensionSet.find(extension)!=s_extensionSet.end();
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if (result) osg::notify(INFO)<<"OpenGL extension '"<<extension<<"' is supported."<<std::endl;
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else osg::notify(INFO)<<"OpenGL extension '"<<extension<<"' is not supported."<<std::endl;
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return result;
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}
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void* osg::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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NSSymbol symbol;
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temp += funcName; // Mac OS X prepends an underscore on function names
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symbol = NSLookupAndBindSymbol( temp.c_str() );
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return NSAddressOfSymbol( symbol );
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#else // all other unixes
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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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