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If you want to use a feature that are in OpenGL 1.2 or later, or in a GL extension, you have to check its availability before actually calling the API function. You can use the following utility procedures.
Note that those functions may return #f
if the connection
to the display subsystem isn't established yet. Usually you have
to initialize and open an window before checking the features.
Returns #t
if GL extensions listed in extension-name …
are all available. Extension-name can be a symbol or
a string (e.g. GL_ARB_multisample
).
Returns #t
if the runtime OpenGL version is less than,
less thanor equal to, greater than, greater than or equal to,
and equal to, the given version, respectively.
Give version in a string, e.g. "1.3"
.
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