113 lines
3.6 KiB
C++
113 lines
3.6 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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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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#include <string>
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#if defined(WIN32)
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#define WIN32_LEAN_AND_MEAN
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#define NOMINMAX
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#include <windows.h>
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#elif defined(__APPLE__)
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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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extern SG_EXPORT 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 (void*)wglGetProcAddress(funcName);
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#elif defined(__APPLE__)
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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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#elif defined (__sun) || defined (__sgi)
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static void *handle = dlopen((const char *)0L, RTLD_LAZY);
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return dlsym(handle, funcName);
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#else // all other unixes
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return dlsym(0, funcName);
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#endif
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}
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/** Set a list of extensions to disable for different OpenGL renders, this allows
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* OSG applications to work around OpenGL drivers bugs which are due to problemenatic extension support.
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* The format of the string is:
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* "GLRendererString : ExtensionName, ExtensionName; GLRenderString2 : ExtensionName;"
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* An example of is : "SUN_XVR1000:GL_EXT_texture_filter_anisotropic"
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* The default setting of GLExtensionDisableString is obtain from the OSG_GL_EXTENSION_DISABLE
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* environmental variable.
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*/
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extern SG_EXPORT void setGLExtensionDisableString(const std::string& disableString);
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/** Get the list of extensions that are disabled for various OpenGL renders.*/
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extern SG_EXPORT std::string& getGLExtensionDisableString();
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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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/** 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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extern SG_EXPORT bool isGLUExtensionSupported(const char *extension);
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}
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#endif
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