i965: support instanced GS on gen7

v3:
 * Properly prevent dual object mode execution when
   the invocation count > 1

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>

1 files changed, 4 insertions, 2 deletions

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 1d00796..0a2d8ff 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
@@ -595,9 +595,11 @@ brw_gs_emit(struct brw_context *brw,
    }
 
    /* Compile the geometry shader in DUAL_OBJECT dispatch mode, if we can do
-    * so without spilling.
+    * so without spilling. If the GS invocations count > 1, then we can't use
+    * dual object mode.
     */
-   if (likely(!(INTEL_DEBUG & DEBUG_NO_DUAL_OBJECT_GS))) {
+   if (c->prog_data.invocations <= 1 &&
+       likely(!(INTEL_DEBUG & DEBUG_NO_DUAL_OBJECT_GS))) {
       c->prog_data.dual_instanced_dispatch = false;
 
       vec4_gs_visitor v(brw, c, prog, shader, mem_ctx, true /* no_spills */);