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nir/lower_io: Add support for global scratch addressing

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This provides an alternate lowering for scratch in which it uses global
reads/writes and bases scratch addresses on a base pointer.

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5927>
This commit is contained in:
Jason Ekstrand
2020-07-14 13:32:19 -05:00
committed by Marge Bot
parent 4815ae51d7
commit c30824adc0
2 changed files with 27 additions and 6 deletions
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3
src/compiler/nir/nir_intrinsics.py
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@@ -608,6 +608,9 @@ system_value("global_invocation_index", 1, bit_sizes=[32, 64])
system_value("work_dim", 1)
system_value("line_width", 1)
system_value("aa_line_width", 1)
# BASE=0 for global/shader, BASE=1 for local/function
system_value("scratch_base_ptr", 0, bit_sizes=[32,64], indices=[BASE])
# Driver-specific viewport scale/offset parameters.
#
# VC4 and V3D need to emit a scaled version of the position in the vertex