mesa: Make gl_VertexID be a system value like gl_InstanceID.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

2 files changed, 2 insertions, 1 deletions

diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index 0d804c2b6ee..ed6b922ca62 100644
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -98,7 +98,7 @@ static const builtin_variable builtin_120_fs_variables[] = {
 };
 
 static const builtin_variable builtin_130_vs_variables[] = {
-   { ir_var_in,  -1,                 "int",   "gl_VertexID" },
+   { ir_var_system_value,  SYSTEM_VALUE_VERTEX_ID, "int",   "gl_VertexID" },
 };
 
 static const builtin_variable builtin_110_deprecated_uniforms[] = {
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index adcbaeb1986..deab97d3ec4 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1798,6 +1798,7 @@ typedef enum
 typedef enum
 {
    SYSTEM_VALUE_FRONT_FACE,  /**< Fragment shader only (not done yet) */
+   SYSTEM_VALUE_VERTEX_ID,   /**< Vertex shader only */
    SYSTEM_VALUE_INSTANCE_ID, /**< Vertex shader only */
    SYSTEM_VALUE_MAX          /**< Number of values */
 } gl_system_value;