/*
* Search for name in the extensions string. Use of strstr()
* is not sufficient because extension names can be prefixes of
* other extension names. Could use strtok() but the constant
* string returned by glGetString might be in read-only memory.
*/
static GLboolean _glewSearchExtension(const char *name, const GLubyte *start, const GLubyte *end) {
const GLubyte *p;
GLuint len = _glewStrLen((const GLubyte *) name);
p = start;
while (p < end) {
GLuint n = _glewStrCLen(p, ' ');
if (len == n && _glewStrSame((const GLubyte *) name, p, n)) return GL_TRUE;
p += n + 1;
}
return GL_FALSE;
}
/*
* Search for name in the extensions string. Use of strstr()
* is not sufficient because extension names can be prefixes of
* other extension names. Could use strtok() but the constant
* string returned by glGetString might be in read-only memory.
*/
GLboolean glewGetExtension (const char* name)
{
GLubyte* p;
GLubyte* end;
GLuint len = _glewStrLen((const GLubyte*)name);
p = (GLubyte*)glGetString(GL_EXTENSIONS);
if (0 == p) return GL_FALSE;
end = p + _glewStrLen(p);
while (p < end)
{
GLuint n = _glewStrCLen(p, ' ');
if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
p += n+1;
}
return GL_FALSE;
}