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nir: Add nir_intrinsic_load_back_face_agx

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On AGX, the special register for front facing is inverted from its meaning in
APIs. We need to lower load_front_face to inot(load_back_face). Doing this in
the backend is trivial, but then we would miss out on algebraic optimizations
for the inot.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11199>
This commit is contained in:
Alyssa Rosenzweig
2021-06-05 15:05:37 -04:00
committed by Marge Bot
parent cac88b5f06
commit c509878971
1 changed files with 3 additions and 0 deletions
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src/compiler/nir/nir_intrinsics.py
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@@ -1183,6 +1183,9 @@ store("tlb_sample_color_v3d", [1], [BASE, COMPONENT, SRC_TYPE], [])
# the target framebuffer
intrinsic("load_fb_layers_v3d", dest_comp=1, flags=[CAN_ELIMINATE, CAN_REORDER])
# Logical complement of load_front_face, mapping to an AGX system value
system_value("back_face_agx", 1, bit_sizes=[1, 32])
# Intel-specific query for loading from the brw_image_param struct passed
# into the shader as a uniform. The variable is a deref to the image
# variable. The const index specifies which of the six parameters to load.