[Mesa-dev] [PATCH v4 7/9] glsl: add gl_InvocationID variable for ARB_gpu_shader5

[Jordan Justen]

v2:
 * Make gl_InvocationID a system value

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Paul Berry <stereotype441 at gmail.com>
---
 src/glsl/builtin_variables.cpp | 2 ++
 src/mesa/main/mtypes.h         | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index cc42338..4f545f4 100644
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -834,6 +834,8 @@ builtin_variable_generator::generate_gs_special_vars()
    add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
    if (state->ARB_viewport_array_enable)
       add_output(VARYING_SLOT_VIEWPORT, int_t, "gl_ViewportIndex");
+   if (state->ARB_gpu_shader5_enable)
+      add_system_value(SYSTEM_VALUE_INVOCATION_ID, int_t, "gl_InvocationID");
 
    /* Although gl_PrimitiveID appears in tessellation control and tessellation
     * evaluation shaders, it has a different function there than it has in
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index ccee7ab..d3e88ee 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2013,6 +2013,7 @@ typedef enum
    SYSTEM_VALUE_SAMPLE_ID,      /**< Fragment shader only */
    SYSTEM_VALUE_SAMPLE_POS,     /**< Fragment shader only */
    SYSTEM_VALUE_SAMPLE_MASK_IN, /**< Fragment shader only */
+   SYSTEM_VALUE_INVOCATION_ID,  /**< Geometry shader only */
    SYSTEM_VALUE_MAX             /**< Number of values */
 } gl_system_value;
 
-- 
1.9.rc1