Mesa (main): pan/bi: Enable mediump BLEND lowering

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Module: Mesa
Branch: main
Commit: 793d18b79bf2c79552546e606d7af7865c793db4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=793d18b79bf2c79552546e606d7af7865c793db4

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Tue May  4 16:05:38 2021 -0400

pan/bi: Enable mediump BLEND lowering

Other lowerings will wait until we iron out various missing features.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9239>

---

 src/panfrost/bifrost/bifrost_compile.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index 7e422d00a62..70a305af7c4 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -3151,6 +3151,12 @@ bifrost_compile_shader_nir(nir_shader *nir,
         NIR_PASS_V(nir, nir_lower_vars_to_ssa);
         NIR_PASS_V(nir, nir_lower_io, nir_var_shader_in | nir_var_shader_out,
                         glsl_type_size, 0);
+
+        if (ctx->stage == MESA_SHADER_FRAGMENT) {
+                NIR_PASS_V(nir, nir_lower_mediump_io, nir_var_shader_out,
+                                ~0, false);
+        }
+
         NIR_PASS_V(nir, nir_lower_ssbo);
         NIR_PASS_V(nir, pan_nir_lower_zs_store);
         NIR_PASS_V(nir, pan_lower_sample_pos);