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texturing: Add test for pixel storage modes for compressed textures:

Yevhenii Kolesnikov requested to merge GL/piglit:test/compressedtex-pixel-storage-modes into main

When specifying a texture in a compressed format, it is possible to select a subregion of data by setting pixel storage modes. No tests for that were found in piglit, though.

This test contains subcases for various combinations of usage of storage pixel modes for functions:

  • glCompressedTexImage2D
  • glCompressedTextureSubImage2D
  • glCompressedTexImage3D

At the momemnt, the only compressed texture format tested, is GL_COMPRESSED_RGB_S3TC_DXT1_EXT.

Signed-off-by: Yevhenii Kolesnikov yevhenii.kolesnikov@globallogic.com

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