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-rw-r--r--src/mesa/main/mtypes.h12
-rw-r--r--src/mesa/state_tracker/st_glsl_to_tgsi.cpp1
2 files changed, 13 insertions, 0 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 933528ad146..b374aa2b138 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2083,6 +2083,8 @@ typedef enum
*
* gl_VertexID gets basevertex added in. This differs from DirectX where
* SV_VertexID does \b not get basevertex added in.
+ *
+ * \sa SYSTEM_VALUE_VERTEX_ID_ZERO_BASE
*/
SYSTEM_VALUE_VERTEX_ID,
@@ -2114,6 +2116,16 @@ typedef enum
* Note that baseinstance is \b not included in the value of instance.
*/
SYSTEM_VALUE_INSTANCE_ID,
+
+ /**
+ * DirectX-style vertex ID.
+ *
+ * Unlike \c SYSTEM_VALUE_VERTEX_ID, this system value does \b not include
+ * the value of basevertex.
+ *
+ * \sa SYSTEM_VALUE_VERTEX_ID, SYSTEM_VALUE_BASE_VERTEX
+ */
+ SYSTEM_VALUE_VERTEX_ID_ZERO_BASE,
/*@}*/
/**
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index a0c89c46fa4..80a049a59c2 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4202,6 +4202,7 @@ const unsigned _mesa_sysval_to_semantic[SYSTEM_VALUE_MAX] = {
*/
TGSI_SEMANTIC_VERTEXID,
TGSI_SEMANTIC_INSTANCEID,
+ 0,
/* Geometry shader
*/