i965: Add resolve option for lossless compression

v2 (Ben): Use combination of msaa_layout and number of samples
          instead of introducing explicit type for lossless
          compression (intel_miptree_is_lossless_compressed()).

Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Ben Widawsky <benjamin.widawsky@intel.com>

src/mesa/drivers/dri/i965/brw_defines.h

@@ -2727,6 +2727,7 @@ enum brw_wm_barycentric_interp_mode {
 # define GEN7_PS_RENDER_TARGET_FAST_CLEAR_ENABLE	(1 << 8)
 # define GEN7_PS_DUAL_SOURCE_BLEND_ENABLE		(1 << 7)
 # define GEN7_PS_RENDER_TARGET_RESOLVE_ENABLE		(1 << 6)
+# define GEN9_PS_RENDER_TARGET_RESOLVE_FULL             (3 << 6)
 # define HSW_PS_UAV_ACCESS_ENABLE			(1 << 5)
 # define GEN7_PS_POSOFFSET_NONE				(0 << 3)
 # define GEN7_PS_POSOFFSET_CENTROID			(2 << 3)

src/mesa/drivers/dri/i965/brw_meta_fast_clear.c

@@ -874,7 +874,10 @@ brw_meta_resolve_color(struct brw_context *brw,
     * bits to let us select the type of resolve.  For fast clear resolves, it
     * turns out we can use the same value as pre-SKL though.
     */
-   set_fast_clear_op(brw, GEN7_PS_RENDER_TARGET_RESOLVE_ENABLE);
+   if (intel_miptree_is_lossless_compressed(brw, mt))
+      set_fast_clear_op(brw, GEN9_PS_RENDER_TARGET_RESOLVE_FULL);
+   else
+      set_fast_clear_op(brw, GEN7_PS_RENDER_TARGET_RESOLVE_ENABLE);
 
    mt->fast_clear_state = INTEL_FAST_CLEAR_STATE_RESOLVED;
    get_resolve_rect(brw, mt, &rect);