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remove some already ifdefed out, no longer functional and used code.
Don't do our own scissor clipping in the pixeldraw/copy paths,
as meas already does that for us...
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functional anyway) rotation code
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driDrawable information now isn't used in most parts of the driver.
makecurrent only updates fb information when the context is new
(driDrawable is still updated by the dri common code).
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Need to turn off FRAG_BIT_COL0 in swrast->_ActiveAttribMask when doing
glRead/CopyPixels to prevent the user's colors from getting overwritten
when a fragment program is active.
This was happening in the DRI drivers when MaintainTexEnv program was
used (the texenv fragment program was enabled when _swrast_DrawPixels was
called).
This still isn't an ideal solution, but fixes things for now.
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It's OK to use _TexEnvProgram regardless of the texture state, but if fog
is also enabled, the fragment program is lacking the actual fog computation
so fogging doesn't appear.
Fixing this might involve a new _MaintainFogProgram field and related code.
For now, just disable the _TexEnvProgram and let swrast handle everything.
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