3333ca2b46
pbuffer functions or exactly ask for the extensions we need to call the apropriate glx extension functions for and around pbuffers extensions. The glx 1.3 version of this functios are prefered. If this is not pressent we are looking for the glx extensions and check for them. Prevously we just used some mix of the glx 1.3 functions or the extension functions without making sure that this extension is present. "
119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 <stdlib.h>
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#include <string.h>
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#include <string>
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namespace osg {
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/** Return floating-point OpenGL version number.
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* Note: Must only be called within a valid OpenGL context,
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* undefined behavior may occur otherwise.
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*/
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extern OSG_EXPORT float getGLVersionNumber();
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/** Return true if "extension" is contained in "extensionString".
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*/
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extern OSG_EXPORT bool isExtensionInExtensionString(const char *extension, const char *extensionString);
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/** Return true if OpenGL "extension" is supported.
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* Note: Must only be called within a valid OpenGL context,
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* undefined behavior may occur otherwise.
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*/
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extern OSG_EXPORT bool isGLExtensionSupported(unsigned int contextID, 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 locally 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 linked to it.
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*/
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extern OSG_EXPORT void* getGLExtensionFuncPtr(const char *funcName);
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/** Set a list of extensions to disable for different OpenGL renderers. This allows
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* OSG applications to work around OpenGL drivers' bugs which are due to problematic 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 obtained from the OSG_GL_EXTENSION_DISABLE
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* environmental variable.
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*/
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extern OSG_EXPORT void setGLExtensionDisableString(const std::string& disableString);
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/** Get the list of extensions that are disabled for various OpenGL renderers. */
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extern OSG_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 used 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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template<typename T>
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bool setGLExtensionFuncPtr(T& t, const char* str1)
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{
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void* data = osg::getGLExtensionFuncPtr(str1);
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if (data)
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{
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memcpy(&t, &data, sizeof(T));
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return false;
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}
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else
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{
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t = 0;
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return false;
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}
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}
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template<typename T>
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bool setGLExtensionFuncPtr(T& t, const char* str1, const char* str2)
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{
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void* data = osg::getGLExtensionFuncPtr(str1,str2);
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if (data)
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{
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memcpy(&t, &data, sizeof(T));
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return false;
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}
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else
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{
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t = 0;
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return false;
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}
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}
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/** Return true if OpenGL "extension" is supported.
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* Note: Must only be called within a valid OpenGL context,
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* undefined behavior may occur otherwise.
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*/
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extern OSG_EXPORT bool isGLUExtensionSupported(unsigned int contextID, const char *extension);
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}
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#endif
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