[Piglit] [patch] tex3d-maxsize.c

[Brian Paul]

Here's a patch for the new tex3d-maxsize test.  The test now uses a 
proxy texture to find the largest working texture size and uses that 
to render something.

Before if we couldn't create a 3D texture of GL_MAX_3D_TEXTURE_SIZE ^ 
3 we just gave up.

-Brian


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