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WIP: OpenGL version of ext_external_objects-vk-image-display-overwrite

Eleni Maria Stea requested to merge wip/gl-version-of-image-displ-overwrite into main

Added a GL test that does the same thing that vk-image-display-overwrite does but using OpenGL only:

The test generates a texture and renders a stripped pattern on it where the middle band is white. Then renders another stripped pattern where the middle band is gray and overwrites the first pattern. At the end it displays the pattern.

At the moment this test fails to overwrite the image in most mesa drivers I've tried which looks like a bug. To see that both patterns are rendered properly check for FIXME in piglit_display and comment out the snippet indicated in the comments.

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