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[Impeller] add explicit VMA flush to device memory writes. #42685

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Jun 9, 2023
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[Impeller] add explicit VMA flush to device memory writes. #42685

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[Impeller] add explicit VMA flush to device memory writes.
Jun 8, 2023
6045e20
Update device_buffer_vk.cc
Jun 9, 2023
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Jun 9, 2023
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Jun 9, 2023
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Update device_buffer_vk.cc
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Jonah Williams authored Jun 9, 2023
commit 6045e20a0e9ad9a47734ef126a8a43bc618fe0ce
2 changes: 2 additions & 0 deletions impeller/renderer/backend/vulkan/device_buffer_vk.cc
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Expand Up @@ -46,6 +46,8 @@ bool DeviceBufferVK::OnCopyHostBuffer(const uint8_t* source,
if (source) {
::memmove(dest + offset, source + source_range.offset, source_range.length);
}
// See https://github.com/flutter/flutter/issues/128556 . Some devices do not
// have support for coherent host memory and require an explicit flush.
::vmaFlushAllocation(allocator_, allocation_, offset, source_range.length);
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@dnfield dnfield Jun 9, 2023

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#ifdef FML_OS_ANDROID?

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@jonahwilliams jonahwilliams Jun 9, 2023

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are you sure? we can't actually test all the devices this will run on, and this will always be safe to call...

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@jonahwilliams jonahwilliams Jun 9, 2023

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I think we should probably just not request coherent memory if we don't need it and add the explict flushes

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@dnfield dnfield Jun 9, 2023

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Ok.

It looks like we should be querying vmaGetMemoryProperties to see if the https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkPhysicalDeviceMemoryProperties.html has a VkMemoryType that supports host coherent.


return true;
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