66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/*
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*
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* Copyright (c) 2001 César Blecua Udías All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* CESAR BLECUA UDIAS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include "extensions.hxx"
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#include <cstring>
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#include <osg/GL> // for glGetString
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bool SGSearchExtensionsString(const char *extString, const char *extName) {
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// Returns GL_TRUE if the *extName string appears in the *extString string,
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// surrounded by white spaces, or GL_FALSE otherwise.
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const char *p, *end;
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int n, extNameLen;
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if ((extString == NULL) || (extName == NULL))
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return false;
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extNameLen = strlen(extName);
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p=extString;
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end = p + strlen(p);
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while (p < end) {
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n = strcspn(p, " ");
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if ((extNameLen == n) && (strncmp(extName, p, n) == 0))
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return GL_TRUE;
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p += (n + 1);
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}
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return GL_FALSE;
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}
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bool SGIsOpenGLExtensionSupported(const char *extName) {
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// Returns GL_TRUE if the OpenGL Extension whose name is *extName
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// is supported by the system, or GL_FALSE otherwise.
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//
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// The *extName string must follow the OpenGL extensions naming scheme
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// (ie: "GL_type_extension", like GL_EXT_convolution)
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return SGSearchExtensionsString((const char *)glGetString(GL_EXTENSIONS),extName);
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}
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