tgsi/scan: update for POSITION and FACE sytem values

Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com
Reviewed-by: Brian Paul <brianp@vmware.com>

diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 6ea32eedd7430786dd74a3967a0f5b58eb860f44..7a02e27e01e866c0b1ded20af07cdf3a5a4bb39d 100644 (file)
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -373,7 +373,10 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
                      info->uses_primid = TRUE;
                   } else if (semName == TGSI_SEMANTIC_INVOCATIONID) {
                      info->uses_invocationid = TRUE;
-                  }
+                  } else if (semName == TGSI_SEMANTIC_POSITION)
+                     info->reads_position = TRUE;
+                  else if (semName == TGSI_SEMANTIC_FACE)
+                     info->uses_frontface = TRUE;
                }
                else if (file == TGSI_FILE_OUTPUT) {
                   info->output_semantic_name[reg] = (ubyte) semName;