i965: Prepare to delete intel_miptree_alloc_ccs()

We're going to delete intel_miptree_alloc_ccs() in the next commit. With
that in mind, replace the use of this function in
do_single_blorp_clear() with intel_miptree_alloc_aux() and move the
delayed allocation logic to it's callers.

v2: Duplicate the delayed allocation comment (Topi Pohjolainen).

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

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

@@ -1208,7 +1208,7 @@ do_single_blorp_clear(struct brw_context *brw, struct gl_framebuffer *fb,
     */
    if (can_fast_clear && !irb->mt->aux_buf) {
       assert(irb->mt->aux_usage == ISL_AUX_USAGE_CCS_D);
-      if (!intel_miptree_alloc_ccs(brw, irb->mt)) {
+      if (!intel_miptree_alloc_aux(brw, irb->mt)) {
          /* There are a few reasons in addition to out-of-memory, that can
           * cause intel_miptree_alloc_non_msrt_mcs to fail.  Try to recover by
           * falling back to non-fast clear.

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

@@ -59,10 +59,6 @@ static void *intel_miptree_map_raw(struct brw_context *brw,
 
 static void intel_miptree_unmap_raw(struct intel_mipmap_tree *mt);
 
-static bool
-intel_miptree_alloc_aux(struct brw_context *brw,
-                        struct intel_mipmap_tree *mt);
-
 static bool
 intel_miptree_supports_mcs(struct brw_context *brw,
                            const struct intel_mipmap_tree *mt)
@@ -791,7 +787,12 @@ intel_miptree_create(struct brw_context *brw,
 
    mt->offset = 0;
 
-   if (!intel_miptree_alloc_aux(brw, mt)) {
+   /* Create the auxiliary surface up-front. CCS_D, on the other hand, can only
+    * compress clear color so we wait until an actual fast-clear to allocate
+    * it.
+    */
+   if (mt->aux_usage != ISL_AUX_USAGE_CCS_D &&
+       !intel_miptree_alloc_aux(brw, mt)) {
       intel_miptree_release(&mt);
       return NULL;
    }
@@ -882,7 +883,12 @@ intel_miptree_create_for_bo(struct brw_context *brw,
    if (!(flags & MIPTREE_CREATE_NO_AUX)) {
       intel_miptree_choose_aux_usage(brw, mt);
 
-      if (!intel_miptree_alloc_aux(brw, mt)) {
+      /* Create the auxiliary surface up-front. CCS_D, on the other hand, can
+       * only compress clear color so we wait until an actual fast-clear to
+       * allocate it.
+       */
+      if (mt->aux_usage != ISL_AUX_USAGE_CCS_D &&
+          !intel_miptree_alloc_aux(brw, mt)) {
          intel_miptree_release(&mt);
          return NULL;
       }
@@ -1776,7 +1782,7 @@ intel_miptree_alloc_mcs(struct brw_context *brw,
    return true;
 }
 
-bool
+static bool
 intel_miptree_alloc_ccs(struct brw_context *brw,
                         struct intel_mipmap_tree *mt)
 {
@@ -1897,7 +1903,7 @@ intel_miptree_alloc_hiz(struct brw_context *brw,
  * create the auxiliary surfaces up-front.  CCS_D, on the other hand, can only
  * compress clear color so we wait until an actual fast-clear to allocate it.
  */
-static bool
+bool
 intel_miptree_alloc_aux(struct brw_context *brw,
                         struct intel_mipmap_tree *mt)
 {
@@ -1919,11 +1925,6 @@ intel_miptree_alloc_aux(struct brw_context *brw,
       return true;
 
    case ISL_AUX_USAGE_CCS_D:
-      /* Since CCS_D can only compress clear color so we wait until an actual
-       * fast-clear to allocate it.
-       */
-      return true;
-
    case ISL_AUX_USAGE_CCS_E:
       assert(_mesa_is_format_color_format(mt->format));
       assert(mt->surf.samples == 1);

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

@@ -354,7 +354,7 @@ struct intel_mipmap_tree
 };
 
 bool
-intel_miptree_alloc_ccs(struct brw_context *brw,
+intel_miptree_alloc_aux(struct brw_context *brw,
                         struct intel_mipmap_tree *mt);
 
 enum intel_miptree_create_flags {