Pass the old/new VkImageLayouts to Vulkan image import/export

Returning the layouts from an export operation and then using
them in a subsequent import operation allows the import to preserve
the texture contents.

This fixes Vukan image wrapping on some AMD/NVIDIA devices.

Bug: dawn:200
Change-Id: Icbb6e759856d410bb69724b9f439bc3088756d19
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28380
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>

src/include/dawn_native/VulkanBackend.h

@@ -33,19 +33,49 @@ namespace dawn_native { namespace vulkan {
     DAWN_NATIVE_EXPORT WGPUTextureFormat
     GetNativeSwapChainPreferredFormat(const DawnSwapChainImplementation* swapChain);
 
-// Can't use DAWN_PLATFORM_LINUX since header included in both dawn and chrome
+    struct DAWN_NATIVE_EXPORT ExternalImageDescriptorVk : ExternalImageDescriptor {
+      public:
+        // The following members may be ignored if |ExternalImageDescriptor::isInitialized| is false
+        // since the import does not need to preserve texture contents.
+
+        // See https://www.khronos.org/registry/vulkan/specs/1.1/html/chap7.html. The acquire
+        // operation old/new layouts must match exactly the layouts in the release operation. So
+        // we may need to issue two barriers releasedOldLayout -> releasedNewLayout ->
+        // cTextureDescriptor.usage if the new layout is not compatible with the desired usage.
+        // The first barrier is the queue transfer, the second is the layout transition to our
+        // desired usage.
+        VkImageLayout releasedOldLayout = VK_IMAGE_LAYOUT_GENERAL;
+        VkImageLayout releasedNewLayout = VK_IMAGE_LAYOUT_GENERAL;
+
+      protected:
+        using ExternalImageDescriptor::ExternalImageDescriptor;
+    };
+
+    struct ExternalImageExportInfoVk : ExternalImageExportInfo {
+      public:
+        // See comments in |ExternalImageDescriptorVk|
+        // Contains the old/new layouts used in the queue release operation.
+        VkImageLayout releasedOldLayout;
+        VkImageLayout releasedNewLayout;
+
+      protected:
+        using ExternalImageExportInfo::ExternalImageExportInfo;
+    };
+
+// Can't use DAWN_PLATFORM_LINUX since header included in both Dawn and Chrome
 #ifdef __linux__
+
         // Common properties of external images represented by FDs. On successful import the file
         // descriptor's ownership is transferred to the Dawn implementation and they shouldn't be
         // used outside of Dawn again. TODO(enga): Also transfer ownership in the error case so the
         // caller can assume the FD is always consumed.
-        struct DAWN_NATIVE_EXPORT ExternalImageDescriptorFD : ExternalImageDescriptor {
+        struct DAWN_NATIVE_EXPORT ExternalImageDescriptorFD : ExternalImageDescriptorVk {
           public:
             int memoryFD;  // A file descriptor from an export of the memory of the image
             std::vector<int> waitFDs;  // File descriptors of semaphores which will be waited on
 
           protected:
-            ExternalImageDescriptorFD(ExternalImageDescriptorType type);
+            using ExternalImageDescriptorVk::ExternalImageDescriptorVk;
         };
 
         // Descriptor for opaque file descriptor image import
@@ -64,8 +94,29 @@ namespace dawn_native { namespace vulkan {
             uint64_t drmModifier;  // DRM modifier of the buffer
         };
 
+        // Info struct that is written to in |ExportVulkanImage|.
+        struct DAWN_NATIVE_EXPORT ExternalImageExportInfoFD : ExternalImageExportInfoVk {
+          public:
+            // Contains the exported semaphore handles.
+            std::vector<int> semaphoreHandles;
+
+          protected:
+            using ExternalImageExportInfoVk::ExternalImageExportInfoVk;
+        };
+
+        struct DAWN_NATIVE_EXPORT ExternalImageExportInfoOpaqueFD : ExternalImageExportInfoFD {
+            ExternalImageExportInfoOpaqueFD();
+        };
+
+        struct DAWN_NATIVE_EXPORT ExternalImageExportInfoDmaBuf : ExternalImageExportInfoFD {
+            ExternalImageExportInfoDmaBuf();
+        };
+
+#endif  // __linux__
+
         // Exports a signal semaphore from a wrapped texture. This must be called on wrapped
         // textures before they are destroyed. On failure, returns -1
+        // TODO(enga): Remove after updating Chromium to use ExportVulkanImage.
         DAWN_NATIVE_EXPORT int ExportSignalSemaphoreOpaqueFD(WGPUDevice cDevice,
                                                              WGPUTexture cTexture);
 
@@ -74,8 +125,15 @@ namespace dawn_native { namespace vulkan {
         // primitives before the texture can be used.
         // On failure, returns a nullptr.
         DAWN_NATIVE_EXPORT WGPUTexture WrapVulkanImage(WGPUDevice cDevice,
-                                                       const ExternalImageDescriptor* descriptor);
-#endif  // __linux__
+                                                       const ExternalImageDescriptorVk* descriptor);
+
+        // Exports external memory from a Vulkan image. This must be called on wrapped textures
+        // before they are destroyed. It writes the semaphore to wait on and the old/new image
+        // layouts to |info|. Pass VK_IMAGE_LAYOUT_UNDEFINED as |desiredLayout| if you don't want to
+        // perform a layout transition.
+        DAWN_NATIVE_EXPORT bool ExportVulkanImage(WGPUTexture cTexture,
+                                                  VkImageLayout desiredLayout,
+                                                  ExternalImageExportInfoVk* info);
 
 }}  // namespace dawn_native::vulkan