i965/wm: Don't sample lossless compressed as multisampled

Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>

diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
index dbc626c..ced9708 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -361,8 +361,12 @@ brw_populate_sampler_prog_key_data(struct gl_context *ctx,
          struct intel_texture_object *intel_tex =
             intel_texture_object((struct gl_texture_object *)t);
 
+         /* From gen9 onwards some single sampled buffers can also be
+          * compressed. These don't need ld2dms sampling along with mcs fetch.
+          */
          if (brw->gen >= 7 &&
-             intel_tex->mt->msaa_layout == INTEL_MSAA_LAYOUT_CMS) {
+             intel_tex->mt->msaa_layout == INTEL_MSAA_LAYOUT_CMS &&
+             intel_tex->mt->num_samples > 1) {
             key->compressed_multisample_layout_mask |= 1 << s;
 
             if (intel_tex->mt->num_samples >= 16) {