nir: add a new v3d-specific intrinsic for tile buffer color reads

This is intended to be used, for example, with OpenGL logic operations. It
takes a render target as source and a sample index in the base index for
MSAA color reads.

v2: drop the CAN_ELIMINATE and CAN_REORDER flags (Eric).

Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/compiler/nir/nir_intrinsics.py b/src/compiler/nir/nir_intrinsics.py
index 0fd8a30eb4dabd8b0bbc502f9937aa60621f9660..a37297ca44081cecbe0492d19c5d37acf89f2178 100644 (file)
--- a/src/compiler/nir/nir_intrinsics.py
+++ b/src/compiler/nir/nir_intrinsics.py
@@ -776,3 +776,12 @@ intrinsic("ssbo_atomic_comp_swap_ir3",  src_comp=[1, 1, 1, 1, 1], dest_comp=1)
 # src[] = { value }
 store("raw_output_pan", 1, [])
 load("raw_output_pan", 0, [], [CAN_ELIMINATE, CAN_REORDER])
+
+# V3D-specific instrinc for tile buffer color reads.
+#
+# The hardware requires that we read the samples and components of a pixel
+# in order, so we cannot eliminate or remove any loads in a sequence.
+#
+# src[] = { render_target }
+# BASE = sample index
+load("tlb_color_v3d", 1, [BASE, COMPONENT], [])