i915g: track TODO items
Just as a reminder for all things currently broken with i915g. Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Jakob Bornecrantz <wallbraker@gmail.com> Signed-off-by: Jakob Bornecrantz <wallbraker@gmail.com>
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Random list of problems with i915g:
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- Dies with BadDrawable on GLXFBconfig changes/destruction. Makes piglit totally
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unusable :( Upgrading xserver helped here, it doesn't crash anymore. Still
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broken, it doesn't update the viewport/get new buffers.
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- Tends to hang the chip after a few minutes of openarena. Looks tiling related,
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at the last frame rendered has tiling corruption over the complete frame.
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- Kills the chip in 3D_PRIMITIVE LINELIST with mesa-demos/fbotexture in
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wireframe mode.
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- Tiling is funny: If unlucky, it renders/samples all black. No clue yet what's
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going on. Seems to depend on tiny details like whethever the sampler
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relocation is fenced/unfenced (broken _with_ fenced reloc using tiling bits!).
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- Y-tiling is even more fun. i915c doesn't use it, maybe there's a reason?
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Texture sampling from Y-tiled buffers seems to work, though (save above
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problems).
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- Review buffer usage/cache domain handling in the winsys. Related: vbo cache
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coherency is bunk: openarena tends to have a bunch of flatshaded triangles
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popping up all over the screen.
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- Need to validate buffers before usage. Currently do_exec on the batchbuffer
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can fail with -ENOSPC.
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Other bugs can be found here:
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https://bugs.freedesktop.org/buglist.cgi?bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&component=Drivers/Gallium/i915g
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