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New shaders:
* Fragment shader which writes depth sampled from a texture
* Fragment shader which copies COLOR[0] to multiple render targets
Additional improvements:
* The fragment 'tex' shaders now take a sampler type (TGSI_TEXTURE_*)
so that they can sample from any type of texture, not only from a 2D one.
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Values outside the writemask are set in the destination to {0,0,0,1}
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Any driver who needs a copy of the shader tokens must organize to
do so itself. This has been the case for a long time, but there
was still defensive code in the state tracker, which is now removed.
Any bugs resulting from this need to be fixed in the offending driver...
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Allows us to fix a mem leak (tokens array).
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