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gallium: add PIPE_BIND_BLENDABLE flag

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This is required for an accurate implementation of d3d1x's
CheckFormatSupport query.

It also seems generally useful for state trackers, which could
choose alternative rendering paths or formats if blending would
come at a significant performance loss.
This commit is contained in:
Christoph Bumiller
2011-10-13 14:48:03 +02:00
parent 0dc97e7fd4
commit a4f26f2bea
2 changed files with 10 additions and 4 deletions
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5
src/gallium/docs/source/screen.rst
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@@ -160,6 +160,11 @@ resources might be created and handled quite differently.
* ``PIPE_BIND_DEPTH_STENCIL``: A depth (Z) buffer and/or stencil buffer. Any
depth/stencil surface/resource attached to pipe_framebuffer_state::zsbuf must
have this flag set.
* ``PIPE_BIND_BLENDABLE``: Used in conjunction with PIPE_BIND_RENDER_TARGET to
query whether a device supports blending for a given format.
If this flag is set, surface creation may fail if blending is not supported
for the specified format. If it is not set, a driver may choose to ignore
blending on surfaces with formats that would require emulation.
* ``PIPE_BIND_DISPLAY_TARGET``: A surface that can be presented to screen. Arguments to
pipe_screen::flush_front_buffer must have this flag set.
* ``PIPE_BIND_SAMPLER_VIEW``: A texture that may be sampled from in a fragment