gallium/radeon: add depth/stencil_adjusted output to surface computation

This fixes a rare bug with stencil texturing -- seen on Polaris and Tonga,
though it's basically a function of the memory configuration so could affect
other parts as well.

Fixes piglit "unaligned-blit * stencil downsample" and various
"fbo-depth-array *stencil*" tests.

Reviewed-by: Marek Olšák <[email protected]>

2 files changed, 10 insertions, 2 deletions

diff --git a/src/gallium/drivers/radeon/r600_texture.c b/src/gallium/drivers/radeon/r600_texture.c
index 434bd44fbbb..7763f812141 100644
--- a/src/gallium/drivers/radeon/r600_texture.c
+++ b/src/gallium/drivers/radeon/r600_texture.c
@@ -1030,8 +1030,8 @@ r600_texture_create_object(struct pipe_screen *screen,
 		if (base->flags & (R600_RESOURCE_FLAG_TRANSFER |
 				   R600_RESOURCE_FLAG_FLUSHED_DEPTH) ||
 		    rscreen->chip_class >= EVERGREEN) {
-			rtex->can_sample_z = true;
-			rtex->can_sample_s = true;
+			rtex->can_sample_z = !rtex->surface.depth_adjusted;
+			rtex->can_sample_s = !rtex->surface.stencil_adjusted;
 		} else {
 			if (rtex->resource.b.b.nr_samples <= 1 &&
 			    (rtex->resource.b.b.format == PIPE_FORMAT_Z16_UNORM ||
diff --git a/src/gallium/drivers/radeon/radeon_winsys.h b/src/gallium/drivers/radeon/radeon_winsys.h
index 0bf6fd97537..de25e19aa5b 100644
--- a/src/gallium/drivers/radeon/radeon_winsys.h
+++ b/src/gallium/drivers/radeon/radeon_winsys.h
@@ -401,6 +401,14 @@ struct radeon_surf {
     uint32_t                    macro_tile_index;
     uint32_t                    micro_tile_mode; /* displayable, thin, depth, rotated */
 
+    /* Whether the depth miptree or stencil miptree as used by the DB are
+     * adjusted from their TC compatible form to ensure depth/stencil
+     * compatibility. If either is true, the corresponding plane cannot be
+     * sampled from.
+     */
+    bool                        depth_adjusted;
+    bool                        stencil_adjusted;
+
     uint64_t                    dcc_size;
     uint64_t                    dcc_alignment;
 };