2 files changed, 3 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index e04f4076e9c..e3feed9aa98 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -392,6 +392,8 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
                      }
                      else if (semName == TGSI_SEMANTIC_STENCIL) {
                         info->writes_stencil = TRUE;
+                     } else if (semName == TGSI_SEMANTIC_SAMPLEMASK) {
+                        info->writes_samplemask = TRUE;
                      }
                   }
 
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index 7e9a5597db2..a3e437809aa 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -82,6 +82,7 @@ struct tgsi_shader_info
    boolean reads_z; /**< does fragment shader read depth? */
    boolean writes_z;  /**< does fragment shader write Z value? */
    boolean writes_stencil; /**< does fragment shader write stencil value? */
+   boolean writes_samplemask; /**< does fragment shader write sample mask? */
    boolean writes_edgeflag; /**< vertex shader outputs edgeflag */
    boolean uses_kill;  /**< KILL or KILL_IF instruction used? */
    boolean uses_persp_center;