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nir: Add pixel_coord, frag_coord_zw intrinsics

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On some architectures, gl_FragCoord.xy is available as an integer but
gl_FragCoord.zw requires interpolation. Add dedicated intrinsics so we can
lower it all in NIR.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23836>
This commit is contained in:
Alyssa Rosenzweig 2023-06-14 18:26:28 -04:00 • committed by Marge Bot
parent 137e8d1cc4
commit c7067660b2
2 changed files with 8 additions and 0 deletions
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2
src/compiler/nir/nir_divergence_analysis.c
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@ -496,6 +496,8 @@ visit_intrinsic(nir_shader *shader, nir_intrinsic_instr *instr)
case nir_intrinsic_load_point_coord:
case nir_intrinsic_load_line_coord:
case nir_intrinsic_load_frag_coord:
case nir_intrinsic_load_frag_coord_zw:
case nir_intrinsic_load_pixel_coord:
case nir_intrinsic_load_fully_covered:
case nir_intrinsic_load_sample_pos:
case nir_intrinsic_load_sample_pos_or_center:

6
src/compiler/nir/nir_intrinsics.py
View file

@ -762,6 +762,12 @@ def system_value(name, dest_comp, indices=[], bit_sizes=[32]):
bit_sizes=bit_sizes)
system_value("frag_coord", 4)
# 16-bit integer vec2 of the pixel X/Y in the framebuffer.
system_value("pixel_coord", 2, bit_sizes=[16])
# Scalar load of frag_coord Z/W components (component=2 for Z, component=3 for
# W). Backends can lower frag_coord to pixel_coord + frag_coord_zw, in case
# X/Y is available as an integer but Z/W requires interpolation.
system_value("frag_coord_zw", 1, indices=[COMPONENT])
system_value("point_coord", 2)
system_value("line_coord", 1)
system_value("front_face", 1, bit_sizes=[1, 32])