gallium: plumb invariant output attrib thru TGSI

Add support for glsl 'invariant' modifier for output data declarations.
Gallium drivers that use TGSI serialization currently loose invariant
modifiers in glsl shaders.

v2: use boolean for invariant instead of unsigned.

Tested: chromiumos on qemu with virglrenderer.
Reviewed-by: Marek Olšák <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

1 files changed, 14 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c b/src/gallium/auxiliary/tgsi/tgsi_text.c
index 55a814994e0..9779f212cb1 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_text.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
@@ -1586,10 +1586,6 @@ static boolean parse_declaration( struct translate_ctx *ctx )
             break;
          }
       }
-      if (i == TGSI_INTERPOLATE_COUNT) {
-         report_error( ctx, "Expected semantic or interpolate attribute" );
-         return FALSE;
-      }
    }
 
    cur = ctx->cur;
@@ -1609,6 +1605,20 @@ static boolean parse_declaration( struct translate_ctx *ctx )
       }
    }
 
+   cur = ctx->cur;
+   eat_opt_white( &cur );
+   if (*cur == ',' && !is_vs_input) {
+      cur++;
+      eat_opt_white( &cur );
+      if (str_match_nocase_whole( &cur, tgsi_invariant_name )) {
+         decl.Declaration.Invariant = 1;
+         ctx->cur = cur;
+      } else {
+         report_error( ctx, "Expected semantic, interpolate attribute, or invariant ");
+         return FALSE;
+      }
+   }
+
    advance = tgsi_build_full_declaration(
       &decl,
       ctx->tokens_cur,