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nir: Add more system values for lowering XFB

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Add more system values for XFB. This should be good enough for lowering GL3.1 +
transform_feedback2 + transform_feedback3. More will probably be needed for
geom/tess but that will be easier to work with when I'm actually bringing up
geom/tess. At any rate, we're splitting out XFB from the rasterization pipeline
and since XFB happens only in the last shader pre-rasterization stage, VS+XFB is
an orthogonal problem from e.g. VS+GS+XFB. Yeah, the combinatorics suck.

These will be used by Asahi, and hopefully eventually Panfrost.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22123>
This commit is contained in:
Alyssa Rosenzweig
2023-03-17 22:57:25 -04:00
committed by Marge Bot
parent 947a7590c7
commit efaffcfbd4
1 changed files with 8 additions and 1 deletions
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9
src/compiler/nir/nir_intrinsics.py
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@@ -864,8 +864,15 @@ system_value("scratch_base_ptr", 0, bit_sizes=[32,64], indices=[BASE])
system_value("constant_base_ptr", 0, bit_sizes=[32,64])
system_value("shared_base_ptr", 0, bit_sizes=[32,64])
system_value("global_base_ptr", 0, bit_sizes=[32,64])
# Address of a transform feedback buffer, indexed by BASE
# Address and size of a transform feedback buffer, indexed by BASE
system_value("xfb_address", 1, bit_sizes=[32,64], indices=[BASE])
system_value("xfb_size", 1, bit_sizes=[32], indices=[BASE])
# Address of the associated index buffer in a transform feedback program for an
# indexed draw. This will be used so transform feedback can pull the gl_VertexID
# from the index buffer.
system_value("xfb_index_buffer", 1, bit_sizes=[32,64])
system_value("frag_size", 2)
system_value("frag_invocation_count", 1)