i965: Support array_layout == ALL_SLICES_AT_EACH_LOD for multiple LODs

Previously array_layout ALL_SLICES_AT_EACH_LOD was only used for array
spacing lod0 on gen7+ and therefore was only used with a single mip
level.

gen6 separate stencil & hiz only support LOD0, so we need to allocate
the miptree similar to gen7+ array spacing lod0, except we also need
space for multiple mip levels. (Since OpenGL stencil and depth support
multiple LODs.)

The miptree is allocated with tightly packed array slice spacing, but
we still also pack the miplevels into the region similar to a normal
multi mip level packing.

A 2D Array texture with 2 slices and multiple LODs would look somewhat
like this:

+----------+
|          |
|          |
+----------+
|          |
|          |
+----------+
+---+ +-+
|   | +-+
+---+ +-+
|   | :
+---+

v3:
 * Use new array_layout enum
 * ASCII art!

Signed-off-by: Jordan Justen <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>
Acked-by: Kenneth Graunke <[email protected]>

1 files changed, 19 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index 1ed62a6bcfa..d15f319158a 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -203,6 +203,11 @@ brw_miptree_layout_2d(struct intel_mipmap_tree *mt)
       if (mt->compressed)
 	 img_height /= mt->align_h;
 
+      if (mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
+         /* Compact arrays with separated miplevels */
+         img_height *= depth;
+      }
+
       /* Because the images are packed better, the final offset
        * might not be the maximal one:
        */
@@ -238,6 +243,7 @@ brw_miptree_layout_texture_array(struct brw_context *brw,
 				 struct intel_mipmap_tree *mt)
 {
    int h0, h1;
+   unsigned height = mt->physical_height0;
 
    h0 = ALIGN(mt->physical_height0, mt->align_h);
    h1 = ALIGN(minify(mt->physical_height0, 1), mt->align_h);
@@ -251,11 +257,22 @@ brw_miptree_layout_texture_array(struct brw_context *brw,
    brw_miptree_layout_2d(mt);
 
    for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
+      unsigned img_height;
+      img_height = ALIGN(height, mt->align_h);
+      if (mt->compressed)
+         img_height /= mt->align_h;
+
       for (int q = 0; q < mt->physical_depth0; q++) {
-	 intel_miptree_set_image_offset(mt, level, q, 0, q * physical_qpitch);
+         if (mt->array_layout == ALL_SLICES_AT_EACH_LOD) {
+            intel_miptree_set_image_offset(mt, level, q, 0, q * img_height);
+         } else {
+            intel_miptree_set_image_offset(mt, level, q, 0, q * physical_qpitch);
+         }
       }
+      height = minify(height, 1);
    }
-   mt->total_height = physical_qpitch * mt->physical_depth0;
+   if (mt->array_layout == ALL_LOD_IN_EACH_SLICE)
+      mt->total_height = physical_qpitch * mt->physical_depth0;
 
    align_cube(mt);
 }