Nouveau - Apr 2015 - [PATCH] nv50, nvc0: limit the y-tiling of 3d textures to the first level's tiling

For some reason we limit y-tiling to 0x20 when depth is involved.
However the function is run for each miplevel, and it appears that you
can't have higher tiling for a smaller miplevel than a larger miplevel.
So when we detect the condtion, limit the height passed to the tiling
function appropriately.

Fixes:
  texelFetch fs sampler3D 98x129x1-98x129x9

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---

This still needs a full piglit run, both on nvc0 and nv50. An
alternative solution is not to limit y-tiling, but presumably it was
done for a reason. joi points out it was added in 040e1d008 -- perhaps
there was no good reason.

 src/gallium/drivers/nouveau/nv50/nv50_miptree.c | 5 ++++-
 src/gallium/drivers/nouveau/nvc0/nvc0_miptree.c | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/nouveau/nv50/nv50_miptree.c
b/src/gallium/drivers/nouveau/nv50/nv50_miptree.c
index 2e41091..0837698 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_miptree.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_miptree.c
@@ -304,7 +304,10 @@ nv50_miptree_init_layout_tiled(struct nv50_miptree *mt)
 
       lvl->offset = mt->total_size;
 
-      lvl->tile_mode = nv50_tex_choose_tile_dims(nbx, nby, d);
+      if (mt->layout_3d && d == 1 && l > 0 &&
pt->depth0 > 1)
+         lvl->tile_mode = nv50_tex_choose_tile_dims(nbx, MIN2(nby, 16), d);
+      else
+         lvl->tile_mode = nv50_tex_choose_tile_dims(nbx, nby, d);
 
       tsx = NV50_TILE_SIZE_X(lvl->tile_mode); /* x is tile row pitch in
bytes */
       tsy = NV50_TILE_SIZE_Y(lvl->tile_mode);
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_miptree.c
b/src/gallium/drivers/nouveau/nvc0/nvc0_miptree.c
index 1beda7d..25ce6bd 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_miptree.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_miptree.c
@@ -211,7 +211,10 @@ nvc0_miptree_init_layout_tiled(struct nv50_miptree *mt)
 
       lvl->offset = mt->total_size;
 
-      lvl->tile_mode = nvc0_tex_choose_tile_dims(nbx, nby, d);
+      if (mt->layout_3d && d == 1 && l > 0 &&
pt->depth0 > 1)
+         lvl->tile_mode = nvc0_tex_choose_tile_dims(nbx, MIN2(nby, 32), d);
+      else
+         lvl->tile_mode = nvc0_tex_choose_tile_dims(nbx, nby, d);
 
       tsx = NVC0_TILE_SIZE_X(lvl->tile_mode); /* x is tile row pitch in
bytes */
       tsy = NVC0_TILE_SIZE_Y(lvl->tile_mode);
-- 
2.0.5