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This path is used to implement both glClear and glClearBuffer; the
latter is only supposed to clear particular buffers. Core Mesa provides
us that information in the buffers bitmask; we must only clear buffers
mentioned there.
To accomplish this, we save/restore the color draw buffers state, and
use glDrawBuffers to restrict drawing to the relevant buffers.
Fixes Piglit's spec/!OpenGL 3.0/clearbuffer-mixed-formats and
spec/ARB_framebuffer_object/fbo-drawbuffers-none glClearBuffer tests
for drivers using meta clears (such as Broadwell).
Cc: "10.2" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77852
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77856
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit
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