ail: Add layout->mipmapped_z input

For 3D images, the full miptree depends on the depth of the image, in contrast
to 2D arrays. We need to account for this to calculate the correct layer
strides.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21114>

src/asahi/layout/layout.c

@@ -249,8 +249,12 @@ ail_make_miptree(struct ail_layout *layout)
     * allocate them all.
     */
    if (layout->levels > 1) {
-      layout->levels =
-         util_logbase2(MAX2(layout->width_px, layout->height_px)) + 1;
+      unsigned major_axis_px = MAX2(layout->width_px, layout->height_px);
+
+      if (layout->mipmapped_z)
+         major_axis_px = MAX2(major_axis_px, layout->depth_px);
+
+      layout->levels = util_logbase2(major_axis_px) + 1;
    }
 
    assert(util_format_get_blockdepth(layout->format) == 1 &&

src/asahi/layout/layout.h

@@ -79,6 +79,12 @@ struct ail_layout {
    /** Number of miplevels. 1 if no mipmapping is used. */
    uint8_t levels;
 
+   /** Should this image be mipmapped along the Z-axis in addition to the X- and
+    * Y-axes? This should be set for API-level 3D images, but not 2D arrays or
+    * cubes.
+    */
+   bool mipmapped_z;
+
    /** Tiling mode used */
    enum ail_tiling tiling;