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Improved backward compatibility by supporting non-arb extension GL_EXT_texture_rectangle

This commit is contained in:
Jens Hemprich 2007-08-20 10:50:03 +00:00
parent ab519288c5
commit 86182d2eed
1 changed files with 25 additions and 19 deletions
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44
MacGLide/OpenGLide/GLExtensions.cpp
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@ -83,7 +83,7 @@ stExtensionSupport glNecessaryExt[] =
}; };
// check to see if Extension is Supported // check to see if Extension is Supported
// code by Mark J. Kilgard of NVidia modified by Fabio Barros // code by Mark J. Kilgard of NVidia modified by Fabio Barros, improved by Jens-Olaf Hemprich
bool OGLIsExtensionSupported(const char* extensions, const char* extension) bool OGLIsExtensionSupported(const char* extensions, const char* extension)
{ {
char* where = (char *) strchr( extension, ' ' ); char* where = (char *) strchr( extension, ' ' );
@ -115,31 +115,37 @@ bool OGLIsExtensionSupported(const char* extensions, const char* extension)
} }
start = terminator; start = terminator;
} }
// map ARB to EXT names in order to support older graphics cards
// fix for Rage 128 OpenGL Engine 1.1.ATI-5.99 static const int numExtensions = 4;
// (See apple techote TN2014) static const struct
if (strcmp(extension, "GL_APPLE_packed_pixels") == 0)
{ {
return OGLIsExtensionSupported(extensions, "GL_APPLE_packed_pixel"); const char* arbName;
const char* extName;
} }
// fix for Rage 128 OpenGL Engine 1.1.ATI-5.99 extensionMapping[numExtensions] =
// support for GL_EXT_texture_env_combine
else if (strcmp(extension, "GL_ARB_texture_env_combine") == 0)
{ {
return OGLIsExtensionSupported(extensions, "GL_EXT_texture_env_combine"); // fix for Rage 128 OpenGL Engine 1.1.ATI-5.99
} // (See apple techote TN2014)
// also support the older GL_EXT_texture_env_add {"GL_APPLE_packed_pixels","GL_APPLE_packed_pixel"},
else if (strcmp(extension, "GL_ARB_texture_env_add") == 0) // fix for Rage 128 OpenGL Engine 1.1.ATI-5.99
// support for GL_EXT_texture_env_combine
{"GL_ARB_texture_env_combine","GL_EXT_texture_env_combine"},
// also support the older GL_EXT_texture_env_add
{"GL_ARB_texture_env_add","GL_EXT_texture_env_add"},
// and non-ARB texture rectangle extension GL_EXT_texture_rectangle
{"GL_ARB_texture_rectangle","GL_EXT_texture_rectangle"}
};
for(int i = 0; i < numExtensions; i++)
{ {
return OGLIsExtensionSupported(extensions, "GL_EXT_texture_env_add"); if (strcmp(extension, extensionMapping[i].arbName) == 0)
} {
else return OGLIsExtensionSupported(extensions, extensionMapping[i].extName);
{ }
return false;
} }
return false;
} }
void ValidateUserConfig( void ) void ValidateUserConfig(void)
{ {
glReportErrors("ValidateUserConfig"); glReportErrors("ValidateUserConfig");