i965: If control_data_header_size_bits is zero, don't do EndPrimitive

This can occur when max_vertices=0 is explicitly specified.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 58191fc..e9f6999 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -1668,6 +1668,9 @@ fs_visitor::emit_gs_end_primitive(const nir_src &vertex_count_nir_src)
    struct brw_gs_prog_data *gs_prog_data =
       (struct brw_gs_prog_data *) prog_data;
 
+   if (gs_compile->control_data_header_size_bits == 0)
+      return;
+
    /* We can only do EndPrimitive() functionality when the control data
     * consists of cut bits.  Fortunately, the only time it isn't is when the
     * output type is points, in which case EndPrimitive() is a no-op.
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 76a80a5..927438f 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
@@ -539,6 +539,9 @@ vec4_gs_visitor::gs_end_primitive()
       return;
    }
 
+   if (c->control_data_header_size_bits == 0)
+      return;
+
    /* Cut bits use one bit per vertex. */
    assert(c->control_data_bits_per_vertex == 1);