pan/midgard: Splatter on fragment out

Make sure that the fragment is complete when writing it out.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/src/panfrost/midgard/midgard_compile.c b/src/panfrost/midgard/midgard_compile.c
index 2d8145c2ec0..76f53fbabfc 100644
--- a/src/panfrost/midgard/midgard_compile.c
+++ b/src/panfrost/midgard/midgard_compile.c
@@ -1590,7 +1590,26 @@ emit_intrinsic(compiler_context *ctx, nir_intrinsic_instr *instr)
         case nir_intrinsic_store_raw_output_pan:
                 assert (ctx->stage == MESA_SHADER_FRAGMENT);
                 reg = nir_src_index(ctx, &instr->src[0]);
-                emit_fragment_store(ctx, reg, 0);
+
+                if (ctx->quirks & MIDGARD_OLD_BLEND) {
+                        /* Suppose reg = qr0.xyzw. That means 4 8-bit ---> 1 32-bit. So
+                         * reg = r0.x. We want to splatter. So we can do a 32-bit move
+                         * of:
+                         *
+                         * imov r0.xyzw, r0.xxxx
+                         */
+
+                        unsigned expanded = make_compiler_temp(ctx);
+
+                        midgard_instruction splatter = v_mov(reg, expanded);
+
+                        for (unsigned c = 0; c < 16; ++c)
+                                splatter.swizzle[1][c] = 0;
+
+                        emit_mir_instruction(ctx, splatter);
+                        emit_fragment_store(ctx, expanded, 0);
+                } else
+                        emit_fragment_store(ctx, reg, 0);
 
                 break;