Vulkan: Don't request aliased FB attachments.

This produces undefined pixel values in GL. We can also return UNSUPPORTED if required and still be conformant. This fixes an assert in the gfx-rs portability implementation. Bug: angleproject:5601 Change-Id: Ifb84ad9b5e2365360a81cddba766b0bea81f2d51 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2668311 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>

Vulkan: Don't request aliased FB attachments.
df48c027 · Jamie Madill · Commit Bot · 18a5e7a6 · df48c027
Commit df48c027 authored Feb 02, 2021 by Jamie Madill Committed by Commit Bot Feb 04, 2021
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vk_cache_utils.cpp src/libANGLE/renderer/vulkan/vk_cache_utils.cpp +2 -7

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--- a/src/libANGLE/renderer/vulkan/vk_cache_utils.cpp
+++ b/src/libANGLE/renderer/vulkan/vk_cache_utils.cpp
@@ -161,8 +161,7 @@ void UnpackAttachmentDesc(VkAttachmentDescription *desc,
                          uint8_t samples,
                          const PackedAttachmentOpsDesc &ops)
 {
-    // We would only need this flag for duplicated attachments. Apply it conservatively.
+    desc->flags   = 0;
-    desc->flags   = VK_ATTACHMENT_DESCRIPTION_MAY_ALIAS_BIT;
    desc->format  = format.actualImageVkFormat();
    desc->samples = gl_vk::GetSamples(samples);
    desc->loadOp  = static_cast<VkAttachmentLoadOp>(ops.loadOp);
@@ -182,11 +181,7 @@ void UnpackColorResolveAttachmentDesc(VkAttachmentDescription *desc,
                                      bool usedAsInputAttachment,
                                      bool isInvalidated)
 {
-    // We would only need this flag for duplicated attachments. Apply it conservatively.  In
+    desc->flags  = 0;
-    // practice it's unlikely any application would use the same image as multiple resolve
-    // attachments simultaneously, so this flag can likely be removed without any issue if it incurs
-    // a performance penalty.
-    desc->flags  = VK_ATTACHMENT_DESCRIPTION_MAY_ALIAS_BIT;
    desc->format = format.actualImageVkFormat();
    // This function is for color resolve attachments.