Vulkan: use supported composite alpha

Try VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR first, if not supported, try VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR. Fail if it is not supported either. BUG=angleproject:2314 Change-Id: I875a60f7b51b9880da2d2916d602a6e7e8ca479f Reviewed-on: https://chromium-review.googlesource.com/882320 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

Vulkan: use supported composite alpha
12da5e75 · Yuly Novikov · Commit Bot · 01b21b19 · 12da5e75
Commit 12da5e75 authored Jan 23, 2018 by Yuly Novikov Committed by Commit Bot Jan 24, 2018
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SurfaceVk.cpp src/libANGLE/renderer/vulkan/SurfaceVk.cpp +9 -1

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--- a/src/libANGLE/renderer/vulkan/SurfaceVk.cpp
+++ b/src/libANGLE/renderer/vulkan/SurfaceVk.cpp
@@ -322,6 +322,14 @@ vk::Error WindowSurfaceVk::initializeImpl(RendererVk *renderer)
        ANGLE_VK_CHECK(foundFormat, VK_ERROR_INITIALIZATION_FAILED);
    }
+    VkCompositeAlphaFlagBitsKHR compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
+    if ((surfaceCaps.supportedCompositeAlpha & compositeAlpha) == 0)
+    {
+        compositeAlpha = VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR;
+    }
+    ANGLE_VK_CHECK((surfaceCaps.supportedCompositeAlpha & compositeAlpha) != 0,
+                   VK_ERROR_INITIALIZATION_FAILED);
    VkSwapchainCreateInfoKHR swapchainInfo;
    swapchainInfo.sType              = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
    swapchainInfo.pNext              = nullptr;
@@ -339,7 +347,7 @@ vk::Error WindowSurfaceVk::initializeImpl(RendererVk *renderer)
    swapchainInfo.queueFamilyIndexCount = 0;
    swapchainInfo.pQueueFamilyIndices   = nullptr;
    swapchainInfo.preTransform          = preTransform;
-    swapchainInfo.compositeAlpha        = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
+    swapchainInfo.compositeAlpha        = compositeAlpha;
    swapchainInfo.presentMode           = swapchainPresentMode;
    swapchainInfo.clipped               = VK_TRUE;
    swapchainInfo.oldSwapchain          = VK_NULL_HANDLE;