pan/mdg: Implement gl_SampleID

[mesa.git] / src / panfrost / midgard / midgard_ra.c

diff --git a/src/panfrost/midgard/midgard_ra.c b/src/panfrost/midgard/midgard_ra.c
index 84f83aa443c5a51e4ebf86c7576d1eeee89ffbc8..4ec60ab0a167e108bce386856d385eae6ec80d5d 100644 (file)
--- a/src/panfrost/midgard/midgard_ra.c
+++ b/src/panfrost/midgard/midgard_ra.c
@@ -630,6 +630,15 @@ allocate_registers(compiler_context *ctx, bool *spilled)
                 l->solutions[ctx->blend_input] = 0;
         }
 
+        /* Same for the dual-source blend input/output, except here we use r2,
+         * which is also set in the fragment shader. */
+
+        if (ctx->blend_src1 != ~0) {
+                assert(ctx->blend_src1 < ctx->temp_count);
+                l->solutions[ctx->blend_src1] = (16 * 2);
+                ctx->work_registers = MAX2(ctx->work_registers, 2);
+        }
+
         mir_compute_interference(ctx, l);
 
         *spilled = !lcra_solve(l);