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Also, rename p_tile.[ch] to u_tile.[ch]
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You don't need a pipe_context * for this, and all other necessary info is
already inside pipe_surface.
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The chars-per-pixel concept falls apart with compressed and yuv images,
where more than one pixel are coded in a single data block.
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Create different temporary surfaces for CPU_READ/WRITE when needed (such as
for glReadPixels, glAccum, some glCopy/DrawPixels, glCopyTexSubImage, etc).
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Instead of get/put_tile(), map the buffer and operate on values directly.
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If the driver can't create a PIPE_FORMAT_R16G16B16A16_SNORM surface, create
an accum surface using a shallower format and taller height. Since only the
accum buffer code accesses the surface the actual format doesn't really
matter, just that there's enough memory.
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The cell driver still uses an internal CELL_FLUSH_WAIT flag, in the long run
proper fencing should be implemented for it.
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Use the code in cso_context.c rather than st_cache.c.
Basically, binding of state objects now goes through the CSO module.
But Vertex/fragment shaders go through pipe->bind_fs/vs_state() since they're
not cached by the CSO module at this time.
Also, update softpipe driver to handle NULL state objects in various places.
This happens during context destruction. May need to update other drivers...
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Update the Makefiles and includes for the new paths.
Note that there hasn't been no separation of the Makefiles yet, and make is
jumping all over the place. That will be taken care shortly. But for now, make
should work. It was tested with linux and linux-dri. Linux-cell and linux-llvm
might require some minor tweaks.
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pipe_get/put_tile_rgba() now use pipe->get/put_tile internally.
Also simplify the <format>_get/put_tile_rgba() helper functions and clean up
some inconsitencies in them.
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It's now the responsibility of surface users to keep track of their mappings.
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Directly use struct pipe_buffer_handle for storage and struct pipe_surface for
(un)mapping.
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The _rgba versions are temporary until the state tracker is updated.
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doesn't handle negative color values)
Also, remove unneeded clamping in the accum ops.
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