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gallium: Document behavior of more lowering pipe caps.

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Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8601>
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Eric Anholt 2021-01-20 15:48:53 -08:00
parent bcb5f9f94a
commit cd03f1c6f6
1 changed files with 12 additions and 3 deletions
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15
docs/gallium/screen.rst
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@ -575,11 +575,20 @@ The integer capabilities:
* ``PIPE_CAP_GL_SPIRV_VARIABLE_POINTERS``: True if the driver supports Variable Pointers in SPIR-V shaders.
* ``PIPE_CAP_DEMOTE_TO_HELPER_INVOCATION``: True if driver supports demote keyword in GLSL programs.
* ``PIPE_CAP_TGSI_TG4_COMPONENT_IN_SWIZZLE``: True if driver wants the TG4 component encoded in sampler swizzle rather than as a separate source.
* ``PIPE_CAP_FLATSHADE``: Driver supports pipe_rasterizer_state::flatshade.
* ``PIPE_CAP_ALPHA_TEST``: Driver supports alpha-testing.
* ``PIPE_CAP_FLATSHADE``: Driver supports pipe_rasterizer_state::flatshade. Must be 1
for non-NIR drivers or gallium nine.
* ``PIPE_CAP_ALPHA_TEST``: Driver supports alpha-testing. Must be 1
for non-NIR drivers or gallium nine. If set, frontend may set
``pipe_depth_stencil_alpha_state->alpha_enabled`` and ``alpha_func``.
Otherwise, alpha test will be lowered to a comparison and discard_if in the
fragment shader.
* ``PIPE_CAP_POINT_SIZE_FIXED``: Driver supports point-sizes that are fixed,
as opposed to writing gl_PointSize for every point.
* ``PIPE_CAP_TWO_SIDED_COLOR``: Driver supports two-sided coloring.
* ``PIPE_CAP_TWO_SIDED_COLOR``: Driver supports two-sided coloring. Must be 1
for non-NIR drivers. If set, pipe_rasterizer_state may be set to indicate
that backfacing primitives should use the back-side color as the FS input
color. If unset, mesa/st will lower it to gl_FrontFacing reads in the
fragment shader.
* ``PIPE_CAP_CLIP_PLANES``: Driver supports user-defined clip-planes.
* ``PIPE_CAP_MAX_VERTEX_BUFFERS``: Number of supported vertex buffers.
* ``PIPE_CAP_OPENCL_INTEGER_FUNCTIONS``: Driver supports extended OpenCL-style integer functions. This includes averge, saturating additiong, saturating subtraction, absolute difference, count leading zeros, and count trailing zeros.