Mesa (master): zink: use general-layout when blitting to/from same resource

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Module: Mesa
Branch: master
Commit: dd2bd68fa69124c86cd008b256d06f44fab8e6cd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=dd2bd68fa69124c86cd008b256d06f44fab8e6cd

Author: Erik Faye-Lund <erik.faye-lund at collabora.com>
Date:   Mon May 25 12:06:04 2020 +0200

zink: use general-layout when blitting to/from same resource

This avoids a validator warning when for instance generating mipmaps.

Fixes: d2bb63c8d4c ("zink: Use optimal layout instead of general. Reduces valid layer warnings. Fixes RADV image noise.")
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5199>

---

 src/gallium/drivers/zink/zink_blit.c | 34 ++++++++++++++++++++++++++++------
 1 file changed, 28 insertions(+), 6 deletions(-)

diff --git a/src/gallium/drivers/zink/zink_blit.c b/src/gallium/drivers/zink/zink_blit.c
index 8accc0c7286..2aeb2247833 100644
--- a/src/gallium/drivers/zink/zink_blit.c
+++ b/src/gallium/drivers/zink/zink_blit.c
@@ -91,13 +91,35 @@ blit_native(struct zink_context *ctx, const struct pipe_blit_info *info)
    zink_batch_reference_resoure(batch, src);
    zink_batch_reference_resoure(batch, dst);
 
-   if (src->layout != VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL)
-      zink_resource_barrier(batch->cmdbuf, src, src->aspect,
-                            VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);
+   if (src == dst) {
+      /* The Vulkan 1.1 specification says the following about valid usage
+       * of vkCmdBlitImage:
+       *
+       * "srcImageLayout must be VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR,
+       *  VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL or VK_IMAGE_LAYOUT_GENERAL"
+       *
+       * and:
+       *
+       * "dstImageLayout must be VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR,
+       *  VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL or VK_IMAGE_LAYOUT_GENERAL"
+       *
+       * Since we cant have the same image in two states at the same time,
+       * we're effectively left with VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR or
+       * VK_IMAGE_LAYOUT_GENERAL. And since this isn't a present-related
+       * operation, VK_IMAGE_LAYOUT_GENERAL seems most appropriate.
+       */
+      if (src->layout != VK_IMAGE_LAYOUT_GENERAL)
+         zink_resource_barrier(batch->cmdbuf, src, src->aspect,
+                               VK_IMAGE_LAYOUT_GENERAL);
+   } else {
+      if (src->layout != VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL)
+         zink_resource_barrier(batch->cmdbuf, src, src->aspect,
+                               VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL);
 
-   if (dst->layout != VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL)
-      zink_resource_barrier(batch->cmdbuf, dst, dst->aspect,
-                            VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);
+      if (dst->layout != VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL)
+         zink_resource_barrier(batch->cmdbuf, dst, dst->aspect,
+                               VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL);
+   }
 
    VkImageBlit region = {};
    region.srcSubresource.aspectMask = src->aspect;