528fdbb75c
returns true if (the extension string is supported or GL version is greater than or equal to a specified version) and non extension disable is used. This makes it possible to disable extensions that are now available as parts of the core OpenGL spec. Updated Texture.cpp is use this method.
125 lines
4.2 KiB
C++
125 lines
4.2 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 true if OpenGL "extension" or minimum OpenGL version number 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 isGLExtensionOrVersionSupported(unsigned int contextID, const char *extension, float requiredGlVersion);
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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 true;
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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 true;
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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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