This is a minimal fix for AMD cards failing to run backendtest by avoiding making glGet* calls for NVIDIA mesh extension features if we know it isn't supported.
68 was intended to be a more general fix that ensures we test the error state after each of the gl calls but I'm not happy with it. No-one has suggested a better approach since then, so let's get AMD cards working with a smaller fix.
This is a minimal fix for AMD cards failing to run backendtest by avoiding making glGet* calls for NVIDIA mesh extension features if we know it isn't supported.
68 was intended to be a more general fix that ensures we test the error state after each of the gl calls but I'm not happy with it. No-one has suggested a better approach since then, so let's get AMD cards working with a smaller fix.