anv: Always emit at least one vertex element

This seems to make the simulator happier.  The early return wasn't
really protecting anything and the code that follows will happily
initialize the dummy element to STORE_0 and emit it.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

diff --git a/src/intel/vulkan/genX_pipeline.c b/src/intel/vulkan/genX_pipeline.c
index 76766a89258cf05a8da25018d648600d0306c7cf..1bc445eae82bba474f82dbd4ff717802abba9fe1 100644 (file)
--- a/src/intel/vulkan/genX_pipeline.c
+++ b/src/intel/vulkan/genX_pipeline.c
@@ -105,9 +105,7 @@ emit_vertex_input(struct anv_pipeline *pipeline,
       __builtin_popcount(elements_double) / 2;
 
    const uint32_t total_elems =
-      elem_count + needs_svgs_elem + vs_prog_data->uses_drawid;
-   if (total_elems == 0)
-      return;
+      MAX2(1, elem_count + needs_svgs_elem + vs_prog_data->uses_drawid);
 
    uint32_t *p;