int arglGLCapabilityCheck(const unsigned short minVersion, const unsigned char *extension)
{
const GLubyte *strVersion;
const GLubyte *strExtensions;
short j, shiftVal;
unsigned short version = 0; // binary-coded decimal gl version (ie. 1.4 is 0x0140).
if (minVersion > 0) {
strVersion = glGetString(GL_VERSION);
#ifdef EDEN_OPENGLES
j = 13; // Of the form "OpenGL ES-XX 1.1", where XX=CM for common, CL for common lite.
#else
j = 0;
#endif
shiftVal = 8;
// Construct BCD version.
while (((strVersion[j] <= '9') && (strVersion[j] >= '0')) || (strVersion[j] == '.')) { // Get only basic version info (until first non-digit or non-.)
if ((strVersion[j] <= '9') && (strVersion[j] >= '0')) {
version += (strVersion[j] - '0') << shiftVal;
shiftVal -= 4;
}
j++;
}
if (version >= minVersion) return (TRUE);
}
if (extension) {
strExtensions = glGetString(GL_EXTENSIONS);
if (arglGluCheckExtension(extension, strExtensions)) return (TRUE);
}
return (FALSE);
}
//
// Checks for the presence of an OpenGL capability by version or extension.
// Reports whether the current OpenGL driver's OpenGL implementation version
// meets or exceeds a minimum value passed in in minVersion (represented as a binary-coded
// decimal i.e. version 1.0 is represented as 0x0100). If minVersion is zero, the
// version test will always fail. Alternately, the test is satisfied if an OpenGL extension
// identifier passed in as a character string
// is non-NULL, and is found in the current driver's list of supported extensions.
// Returns: TRUE If either of the tests passes, or FALSE if both fail.
//
static int arglGLCapabilityCheck(const unsigned short minVersion, const unsigned char *extension)
{
const GLubyte * strRenderer;
const GLubyte * strVersion;
const GLubyte * strVendor;
const GLubyte * strExtensions;
short j, shiftVal;
unsigned short version = 0; // binary-coded decimal gl version (ie. 1.4 is 0x0140).
strRenderer = glGetString(GL_RENDERER);
strVendor = glGetString(GL_VENDOR);
strVersion = glGetString(GL_VERSION);
j = 0;
shiftVal = 8;
// Construct BCD version.
while (((strVersion[j] <= '9') && (strVersion[j] >= '0')) || (strVersion[j] == '.')) { // Get only basic version info (until first non-digit or non-.)
if ((strVersion[j] <= '9') && (strVersion[j] >= '0')) {
version += (strVersion[j] - '0') << shiftVal;
shiftVal -= 4;
}
j++;
}
strExtensions = glGetString(GL_EXTENSIONS);
if (0 < minVersion && version >= minVersion) return (TRUE);
if (extension && arglGluCheckExtension(extension, strExtensions)) return (TRUE);
return (FALSE);
}