>Psychtoolbox>PsychTests

TextureChannelsTest

Test proper assignment of matrix layers to RGBA texture channels.

What you should see during the test:

1. A red square on a black background. Keypress!
2. A green square on a black background. Keypress!
3. A blue square on a black background. Keypress!
4. A black screen. Keypress!
   End.

If you see different colors in different order, then
something in the RGBA path of Screen(‘MakeTexture’) is
broken, e.g., due to some machine endian issue.