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Quite a few util modules were maintaining a single vertex buffer over multiple
frames, and potentially reusing it in subsequent frames. Unfortunately that
would force us into syncrhonous rendering as the buffer manager would be
forced to wait for the previous rendering to complete prior to allowing the
map.
This resolves that issue, but requires the state tracker to issue a few new
flush() calls at the end of each frame.
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Remove util_gen_mipmap_filter() when no longer used.
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We need a way to specify the type of minification filter
used to downsample mipmap levels.
The old util_gen_mipmap() retains its behaviour and uses
LINEAR filter.
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(blit, gen-mipmaps, quad-clear, etc)
Also, additional cso_set_*() functions for viewport, framebuffer, blend color,
etc. state.
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Based on code from Mesa's state tracker.
Still need to implement fallbacks for those texture formats which can't
generally be rendered to.
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