From: Rob Clark <robdclark@chromium.org>
Date: Fri, 11 Oct 2019 02:36:30 +0000 (-0700)
Subject: freedreno/ir3: force i/j pixel to r0.x
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7d4213fe88a5398fa1624615780decf113d44359;p=mesa.git

freedreno/ir3: force i/j pixel to r0.x

It seems that pre-fs texture fetch only works if ij_pix ends up in r0.x.
I've tried unknown zero bits, to no avail, and blob also seems to force
r0.x when this feature is used.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
---

diff --git a/src/freedreno/ir3/ir3_compiler_nir.c b/src/freedreno/ir3/ir3_compiler_nir.c
index 38c60f8cfe6..5b1adf29e3d 100644
--- a/src/freedreno/ir3/ir3_compiler_nir.c
+++ b/src/freedreno/ir3/ir3_compiler_nir.c
@@ -3211,6 +3211,28 @@ ir3_compile_shader_nir(struct ir3_compiler *compiler,
 		ctx->primitive_id->regs[0]->num = 1;
 		struct ir3_instruction *precolor[] = { ctx->gs_header, ctx->primitive_id };
 		ret = ir3_ra(so, precolor, ARRAY_SIZE(precolor));
+	} else if (so->num_sampler_prefetch) {
+		assert(so->type == MESA_SHADER_FRAGMENT);
+		struct ir3_instruction *precolor[2];
+		int idx = 0;
+
+		for (unsigned i = 0; i < ir->ninputs; i++) {
+			struct ir3_instruction *instr = ctx->ir->inputs[i];
+
+			if (!instr)
+				continue;
+
+			if (instr->input.sysval != SYSTEM_VALUE_BARYCENTRIC_PIXEL)
+				continue;
+
+			assert(idx < ARRAY_SIZE(precolor));
+
+			precolor[idx] = instr;
+			instr->regs[0]->num = idx;
+
+			idx++;
+		}
+		ret = ir3_ra(so, precolor, idx);
 	} else {
 		ret = ir3_ra(so, NULL, 0);
 	}