gallium/ttn: mark location specially in nir for color0-writes-all

We need to distinguish a shader that has separate writes to each MRT
from one which is supposed to write the data from MRT 0 to all the MRTs.
In TGSI this is done with a property. NIR doesn't have that, so encode
it as a funny location and decode on the other end.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/gallium/auxiliary/nir/tgsi_to_nir.c b/src/gallium/auxiliary/nir/tgsi_to_nir.c
index bf7eb2fde02..4130697e2a7 100644
--- a/src/gallium/auxiliary/nir/tgsi_to_nir.c
+++ b/src/gallium/auxiliary/nir/tgsi_to_nir.c
@@ -253,7 +253,12 @@ ttn_emit_declaration(struct ttn_compile *c)
             var->name = ralloc_asprintf(var, "out_%d", idx);
 
             var->data.location = decl->Semantic.Name;
-            var->data.index = decl->Semantic.Index;
+            if (decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
+                decl->Semantic.Index == 0 &&
+                c->scan->properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS])
+               var->data.index = -1;
+            else
+               var->data.index = decl->Semantic.Index;
 
             if (is_array) {
                unsigned j;