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This was only needed to avoid out-of-bounds memory accesses with the
2x2 quad_read/write() functions which no longer exist.
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For some drivers (like Xlib) it's not possible to treat the front/back color
buffers as pipe_regions. So pipe->region_copy() won't work. Added a new
state tracker field indicating if we can use regions for colorbuffer accesses.
This should probably be re-considered someday...
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doesn't handle negative color values)
Also, remove unneeded clamping in the accum ops.
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This fixes potential a stale reference to vertex buffers.
Fixes cubemap demo on i915.
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This controls whether texcoords are interpreted as-is or scaled up from [0,1].
Fixes glDrawPixels/glBitmap problems on i915 when image is non power-of-two.
Also, cleans up the CSO sampler state for i915 a bit.
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