/usr/include/osg/GLExtensions is in libopenscenegraph-dev 3.2.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_GLEXTENSIONS
#define OSG_GLEXTENSIONS 1
#include <osg/Export>
#include <stdlib.h>
#include <string.h>
#include <string>
namespace osg {
/** Return floating-point OpenGL version number.
* Note: Must only be called within a valid OpenGL context,
* undefined behavior may occur otherwise.
*/
extern OSG_EXPORT float getGLVersionNumber();
/** Return true if "extension" is contained in "extensionString".
*/
extern OSG_EXPORT bool isExtensionInExtensionString(const char *extension, const char *extensionString);
/** Return true if OpenGL "extension" is supported.
* Note: Must only be called within a valid OpenGL context,
* undefined behavior may occur otherwise.
*/
extern OSG_EXPORT bool isGLExtensionSupported(unsigned int contextID, const char *extension);
/** Return true if OpenGL "extension" or minimum OpenGL version number is supported.
* Note: Must only be called within a valid OpenGL context,
* undefined behavior may occur otherwise.
*/
extern OSG_EXPORT bool isGLExtensionOrVersionSupported(unsigned int contextID, const char *extension, float requiredGlVersion);
/** Return the address of the specified OpenGL function.
* Return NULL if function not supported by OpenGL library.
* Note, glGLExtensionFuncPtr is declared inline so that the code
* is compiled locally to the calling code. This should get by Windows'
* dumb implementation of having different GL function ptr's for each
* library when linked to it.
*/
extern OSG_EXPORT void* getGLExtensionFuncPtr(const char *funcName);
/** Set a list of extensions to disable for different OpenGL renderers. This allows
* OSG applications to work around OpenGL drivers' bugs which are due to problematic extension support.
* The format of the string is:
* "GLRendererString : ExtensionName, ExtensionName; GLRenderString2 : ExtensionName;"
* An example of is : "SUN_XVR1000:GL_EXT_texture_filter_anisotropic"
* The default setting of GLExtensionDisableString is obtained from the OSG_GL_EXTENSION_DISABLE
* environmental variable.
*/
extern OSG_EXPORT void setGLExtensionDisableString(const std::string& disableString);
/** Get the list of extensions that are disabled for various OpenGL renderers. */
extern OSG_EXPORT std::string& getGLExtensionDisableString();
/** Return the address of the specified OpenGL function. If not found then
* check a second function name, if this fails then return NULL as function is
* not supported by OpenGL library. This is used for checking something
* like glActiveTexture (which is in OGL1.3) or glActiveTextureARB.
*/
inline void* getGLExtensionFuncPtr(const char *funcName,const char *fallbackFuncName)
{
void* ptr = getGLExtensionFuncPtr(funcName);
if (ptr) return ptr;
return getGLExtensionFuncPtr(fallbackFuncName);
}
/** Return the address of the specified OpenGL function. If not found then
* check a second function name, if this fails then return NULL as function is
* not supported by OpenGL library. This is used for checking something
* like glActiveTexture (which is in OGL1.3) or glActiveTextureARB.
*/
inline void* getGLExtensionFuncPtr(const char *funcName1, const char *funcName2, const char *funcName3)
{
void* ptr = getGLExtensionFuncPtr(funcName1);
if (ptr) return ptr;
ptr = getGLExtensionFuncPtr(funcName2);
if (ptr) return ptr;
return getGLExtensionFuncPtr(funcName3);
}
template<typename T, typename R>
T convertPointerType(R src)
{
T dest;
memcpy(&dest, &src, sizeof(src));
return dest;
}
template<typename T>
bool setGLExtensionFuncPtr(T& t, const char* str1)
{
void* data = osg::getGLExtensionFuncPtr(str1);
if (data)
{
memcpy(&t, &data, sizeof(T));
return true;
}
else
{
t = 0;
return false;
}
}
template<typename T>
bool setGLExtensionFuncPtr(T& t, const char* str1, const char* str2)
{
void* data = osg::getGLExtensionFuncPtr(str1,str2);
if (data)
{
memcpy(&t, &data, sizeof(T));
return true;
}
else
{
t = 0;
return false;
}
}
template<typename T>
bool setGLExtensionFuncPtr(T& t, const char* str1, const char* str2, const char* str3)
{
void* data = osg::getGLExtensionFuncPtr(str1,str2,str3);
if (data)
{
memcpy(&t, &data, sizeof(T));
return true;
}
else
{
t = 0;
return false;
}
}
}
#endif
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