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This allows us to remove most of the direct references to winsys in the state tracker.
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Fixes duplicated text bug in progs/tests/texwrap.c
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Make sure we can really render to the texture surface given its format.
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Also, make sure surfaces are suitable for blitting before calling util_blit_pixels().
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This fixes a weird conform test failure that depended on something that
happened several tests earlier. This took waaaaaay too long to find/fix.
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If we run out of texture memory we may not have the texture needed by the
fragment shader. If this happens, plug in a color passthrough shader.
So instead of crashing, we just don't see the texture.
GL_OUT_OF_MEMORY is raised, of course.
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Actually, the hack is still there and needs to be revisited, but I get a bit
further with compressed textures now.
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Doesn't seem to be needed after fixing the float->int conversion problem.
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Also, rearrange the st_destroy_context() code a bit to prevent some
invalid/NULL ptr derefs during tear-down.
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Also clarify that RGB formats with no (used) alpha component are treated as
having alpha = 1.0.
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If texturing happens to be enabled when glBitmap() is called, need to be
careful about choosing a sampler unit, etc.
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The return value was never used.
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This state is effectively private to the vertex processing part
of the draw module.
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