Vulkan: request coherent memory for StagingImage

Otherwise vkInvalidateMappedMemoryRanges is needed, if allocated memory is not coherent, which was happening on Nexus 5X and was caught by validation layers. BUG=angleproject:2314 TEST=all angle_end2end_tests pass on Nexus 5X Change-Id: I008aae45b99c6ca87029ff1614913fae32f66ec3 Reviewed-on: https://chromium-review.googlesource.com/900203Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org>

Vulkan: request coherent memory for StagingImage
9a608c0e · Yuly Novikov · Commit Bot · df9ad2be · 9a608c0e
Commit 9a608c0e authored Feb 02, 2018 by Yuly Novikov Committed by Commit Bot Feb 03, 2018
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vk_utils.cpp src/libANGLE/renderer/vulkan/vk_utils.cpp +6 -1

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--- a/src/libANGLE/renderer/vulkan/vk_utils.cpp
+++ b/src/libANGLE/renderer/vulkan/vk_utils.cpp
@@ -847,8 +847,13 @@ Error StagingImage::init(VkDevice device,
    mImage.getMemoryRequirements(device, &memoryRequirements);
    // Find the right kind of memory index.
+    // TODO(ynovikov): better approach would be to request just visible memory,
+    // and call vkInvalidateMappedMemoryRanges if the allocated memory is not coherent.
+    // This would solve potential issues of:
+    // 1) not having (enough) coherent memory and 2) coherent memory being slower
    uint32_t memoryIndex = memoryProperties.findCompatibleMemoryIndex(
-        memoryRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT);
+        memoryRequirements.memoryTypeBits,
+        VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
    VkMemoryAllocateInfo allocateInfo;
    allocateInfo.sType           = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;