Mesa (main): iris: fix layer calculation for TEXTURE_3D ReadPixels() on mip-level>0

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Module: Mesa
Branch: main
Commit: b9452627730066872af6cf11a3fc390ca29ca242
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b9452627730066872af6cf11a3fc390ca29ca242

Author: Yevhenii Kharchenko <yevhenii.kharchenko at globallogic.com>
Date:   Tue Feb 23 00:15:15 2021 +0200

iris: fix layer calculation for TEXTURE_3D ReadPixels() on mip-level>0

Fixes assert when ReadPixels() called to read from FBO to
GL_PIXEL_PACK_BUFFER, on mip-level > 0, since num_layers
wasn't properly calculated with mip-level.

v2: patched 'iris_create_sampler_view' function instead of
'resolve_sampler_views'. Just like it was suggested in this
function's comment.
The logic of fix is similar to one in 'update_image_surface' function
of i965 driver, which is introduced in commit
f9fd0cf4790cb2a530e75d1a2206dbb9d8af7cb2.
With a slight change: setting array_len=1, like it was done in
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5808 ,
since minifying depth fails KHR-GLES2.texture_3d.filtering tests.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4145
Fixes: 3c979b0e ('iris: add some draw resolve hooks')

Signed-off-by: Yevhenii Kharchenko <yevhenii.kharchenko at globallogic.com>
Reviewed-by: Tapani Pälli <tapani.palli at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9253>

---

 src/gallium/drivers/iris/iris_state.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/gallium/drivers/iris/iris_state.c b/src/gallium/drivers/iris/iris_state.c
index a2426c3352d..52181f06d89 100644
--- a/src/gallium/drivers/iris/iris_state.c
+++ b/src/gallium/drivers/iris/iris_state.c
@@ -2426,10 +2426,15 @@ iris_create_sampler_view(struct pipe_context *ctx,
    if (tmpl->target != PIPE_BUFFER) {
       isv->view.base_level = tmpl->u.tex.first_level;
       isv->view.levels = tmpl->u.tex.last_level - tmpl->u.tex.first_level + 1;
-      // XXX: do I need to port f9fd0cf4790cb2a530e75d1a2206dbb9d8af7cb2?
-      isv->view.base_array_layer = tmpl->u.tex.first_layer;
-      isv->view.array_len =
-         tmpl->u.tex.last_layer - tmpl->u.tex.first_layer + 1;
+
+      if (tmpl->target == PIPE_TEXTURE_3D) {
+         isv->view.base_array_layer = 0;
+         isv->view.array_len = 1;
+      } else {
+         isv->view.base_array_layer = tmpl->u.tex.first_layer;
+         isv->view.array_len =
+            tmpl->u.tex.last_layer - tmpl->u.tex.first_layer + 1;
+      }
 
       if (iris_resource_unfinished_aux_import(isv->res))
          iris_resource_finish_aux_import(&screen->base, isv->res);