gallium: Add support for multiple viewports

Gallium supported only a single viewport/scissor combination. This
commit changes the interface to allow us to add support for multiple
viewports/scissors.

Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: José Fonseca<[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index bd79405a8aa..0230267a5de 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -211,6 +211,12 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
                       fulldecl->Semantic.Name == TGSI_SEMANTIC_EDGEFLAG) {
                      info->writes_edgeflag = TRUE;
                   }
+
+                  if (procType == TGSI_PROCESSOR_GEOMETRY &&
+                      fulldecl->Semantic.Name ==
+                      TGSI_SEMANTIC_VIEWPORT_INDEX) {
+                     info->writes_viewport_index = TRUE;
+                  }
                }
 
              }