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First step to consolidating surface/texture caching...
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This fixes a DRM BO failure upon swapbuffers caused by the color buffer
still being mapped.
This is a bit heavy handed since we don't always need to unmap buffers
when flushing. Need to pass a flag to flush() or design a new function.
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Also, quite a bit of re-org of the tile caches and surface mapping/unmapping.
Leave surfaces mapped between primitives now.
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Instead of using read/write_quad() functions, do framebuffer accesses via
get/put_tile(). A cache of tiles is used to avoid frequent get/put() calls.
Only implemented for color buffers right now.
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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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Fix warnings in draw_create_vertex_shader()
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function)
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