iris: setup EdgeFlag Vertex Element when needed.

If Vertex Shader uses EdgeFlag the hardware request that it is setup
as the last VERTEX_ELEMENT_STATE. If SGVS are add at draw time we
need to also reconfigure the last 3DSTATE_VF_INSTANCING so its
VertexElementIndex points to the new Vertex Element that contains
the EdgeFlag.

So if draw parameters or edgeflag are not used the CSO generated at
iris_create_vertex_element is sent directly in the batches. But if
edge flag is used we adjust last VERTEX_ELEMENT_STATE and
last 3DSTATE_VF_INSTANCING using their alternative edge flag version
we generate at iris_create_vertex_element and store at the CSO.

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 8 insertions, 1 deletions

diff --git a/src/gallium/drivers/iris/iris_program.c b/src/gallium/drivers/iris/iris_program.c
index ad3eab6d8ce..2feb43a367f 100644
--- a/src/gallium/drivers/iris/iris_program.c
+++ b/src/gallium/drivers/iris/iris_program.c
@@ -626,15 +626,22 @@ iris_update_compiled_vs(struct iris_context *ice)
       const bool needs_sgvs_element = uses_draw_params ||
                                       vs_prog_data->uses_instanceid ||
                                       vs_prog_data->uses_vertexid;
+      bool needs_edge_flag = false;
+      nir_foreach_variable(var, &ish->nir->inputs) {
+         if (var->data.location == VERT_ATTRIB_EDGEFLAG)
+            needs_edge_flag = true;
+      }
 
       if (ice->state.vs_uses_draw_params != uses_draw_params ||
-          ice->state.vs_uses_derived_draw_params != uses_derived_draw_params) {
+          ice->state.vs_uses_derived_draw_params != uses_derived_draw_params ||
+          ice->state.vs_needs_edge_flag != needs_edge_flag) {
          ice->state.dirty |= IRIS_DIRTY_VERTEX_BUFFERS |
                              IRIS_DIRTY_VERTEX_ELEMENTS;
       }
       ice->state.vs_uses_draw_params = uses_draw_params;
       ice->state.vs_uses_derived_draw_params = uses_derived_draw_params;
       ice->state.vs_needs_sgvs_element = needs_sgvs_element;
+      ice->state.vs_needs_edge_flag = needs_edge_flag;
    }
 }