Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
---
src/mesa/drivers/dri/i965/brw_defines.h | 5 +++++
src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp | 24 ++++++++++++++++++++---
2 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_defines.h
b/src/mesa/drivers/dri/i965/brw_defines.h
index 7f4cd10..5fe1aba 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -1500,6 +1500,11 @@ enum brw_message_target {
# define BRW_GS_EDGE_INDICATOR_0 (1 << 8)
# define BRW_GS_EDGE_INDICATOR_1 (1 << 9)
+/* GS Thread Payload
+ */
+/* R0 */
+# define GEN7_GS_PAYLOAD_INSTANCE_ID_SHIFT 27
+
/* 3DSTATE_GS "Output Vertex Size" has an effective maximum of 62. It's
* counted in multiples of 16 bytes.
*/
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
index 40743cc..12e137c 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
@@ -51,9 +51,27 @@ vec4_gs_visitor::vec4_gs_visitor(struct brw_context *brw,
dst_reg *
vec4_gs_visitor::make_reg_for_system_value(ir_variable *ir)
{
- /* Geometry shaders don't use any system values. */
- assert(!"Unreached");
- return NULL;
+ dst_reg *reg;
+ src_reg r0(retype(brw_vec4_grf(0, 0), BRW_REGISTER_TYPE_UD));
+
+ switch (ir->data.location) {
+ case SYSTEM_VALUE_INVOCATION_ID:
+ this->current_annotation = "initialize gl_InvocationID";
+
+ reg = new(mem_ctx) dst_reg(this, ir->type);
+
+ /* Copy and shift gen7 instance id from R0 into the
+ * gl_InvocationID register.
+ */
+ emit(SHR(*reg, src_reg(r0),
+ (uint32_t) GEN7_GS_PAYLOAD_INSTANCE_ID_SHIFT));
+ break;
+ default:
+ assert(!"not reached");
+ break;
+ }
+
+ return reg;
}
--
1.8.5.3
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