81 lines
3.1 KiB
C++
81 lines
3.1 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 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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/** 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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