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KhronosGroup / MoltenVK

MoltenVK is a Vulkan Portability implementation. It layers a subset of the high-performance, industry-standard Vulkan graphics and compute API over Apple's Metal graphics framework, enabling Vulkan applications to run on macOS, iOS and tvOS.
Apache License 2.0
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Support texel buffers for images on device memory with private (device-only) storage #2209

Open billhollings opened 2 months ago

billhollings commented 2 months ago

Vulkan supports creating a VkDeviceMemory on device-only storage (MTLStorageModePrivate), binding a VkImage and VkBuffer on the same memory offset, and then expecting changes in each resource to automatically propagate to the other.

MoltenVK supports this for host-accessible storage by creating a MTLBuffer in the MVKDeviceMemory and then creating the MVKImage as a texel buffer on that MTLBuffer.

This should also be supported for device-only storage as well.

This issue causes the following CTS tests to fail (among others no doubt):

dEQP-VK.image.host_image_copy.identical_memory_layout.linear.r8g8b8a8_unorm
dEQP-VK.image.host_image_copy.identical_memory_layout.linear.r32g32b32a32_sfloat
dEQP-VK.image.host_image_copy.identical_memory_layout.linear.r16_unorm
dEQP-VK.image.host_image_copy.identical_memory_layout.linear.r16g16_uint
dEQP-VK.image.host_image_copy.identical_memory_layout.linear.r16_sfloat