i965: Expose logic telling if non-msrt mcs is supported

Alos use the opportunity to mark inputs constant. (Context has to be
given as read-write to intel_miptree_supports_non_msrt_fast_clear()
to support debug output).

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

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

@@ -161,8 +161,9 @@ intel_get_non_msrt_mcs_alignment(struct intel_mipmap_tree *mt,
    }
 }
 
-static bool
-intel_tiling_supports_non_msrt_mcs(struct brw_context *brw, unsigned tiling)
+bool
+intel_tiling_supports_non_msrt_mcs(const struct brw_context *brw,
+                                   unsigned tiling)
 {
    /* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render
     * Target(s)", beneath the "Fast Color Clear" bullet (p326):
@@ -200,9 +201,9 @@ intel_tiling_supports_non_msrt_mcs(struct brw_context *brw, unsigned tiling)
  *     - MCS and Lossless compression is supported for TiledY/TileYs/TileYf
  *     non-MSRTs only.
  */
-static bool
+bool
 intel_miptree_supports_non_msrt_fast_clear(struct brw_context *brw,
-                                           struct intel_mipmap_tree *mt)
+                                           const struct intel_mipmap_tree *mt)
 {
    /* MCS support does not exist prior to Gen7 */
    if (brw->gen < 7)

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

@@ -670,6 +670,14 @@ bool
 intel_miptree_is_lossless_compressed(const struct brw_context *brw,
                                      const struct intel_mipmap_tree *mt);
 
+bool
+intel_tiling_supports_non_msrt_mcs(const struct brw_context *brw,
+                                   unsigned tiling);
+
+bool
+intel_miptree_supports_non_msrt_fast_clear(struct brw_context *brw,
+                                           const struct intel_mipmap_tree *mt);
+
 bool
 intel_miptree_alloc_non_msrt_mcs(struct brw_context *brw,
                                  struct intel_mipmap_tree *mt);