src/Vulkan/VkDeviceMemory.cpp - SwiftShader - Git at Google

 // Copyright 2018 The SwiftShader Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "VkDeviceMemory.hpp"
 #include "VkDeviceMemoryExternalHost.hpp"

 #include "VkBuffer.hpp"
 #include "VkConfig.hpp"
 #include "VkDevice.hpp"
 #include "VkImage.hpp"
 #include "VkMemory.hpp"
 #include "VkStringify.hpp"

 #if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD

 // Helper struct which reads the parsed allocation info and
 // extracts relevant information related to the handle type
 // supported by this DeviceMemory subclass.
 struct OpaqueFdAllocateInfo
 {
 	bool importFd = false;
 	bool exportFd = false;
 	int fd = -1;

 	OpaqueFdAllocateInfo() = default;

 	// Read the parsed allocation info to initialize an OpaqueFdAllocateInfo.
 	OpaqueFdAllocateInfo(const vk::DeviceMemory::ExtendedAllocationInfo &extendedAllocationInfo)
 	{
 		if(extendedAllocationInfo.importMemoryFdInfo)
 		{
 			if(extendedAllocationInfo.importMemoryFdInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT)
 			{
 				UNSUPPORTED("VkImportMemoryFdInfoKHR::handleType %d", int(extendedAllocationInfo.importMemoryFdInfo->handleType));
 			}
 			importFd = true;
 			fd = extendedAllocationInfo.importMemoryFdInfo->fd;
 		}

 		if(extendedAllocationInfo.exportMemoryAllocateInfo)
 		{
 			if(extendedAllocationInfo.exportMemoryAllocateInfo->handleTypes != VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT)
 			{
 				UNSUPPORTED("VkExportMemoryAllocateInfo::handleTypes %d", int(extendedAllocationInfo.exportMemoryAllocateInfo->handleTypes));
 			}
 			exportFd = true;
 		}
 	}
 };

 #	if defined(__APPLE__)
 #		include "VkDeviceMemoryExternalMac.hpp"
 #	elif defined(__linux__) && !defined(__ANDROID__)
 #		include "VkDeviceMemoryExternalLinux.hpp"
 #	else
 #		error "Missing VK_KHR_external_memory_fd implementation for this platform!"
 #	endif
 #endif

 #if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 #	if defined(__ANDROID__)
 #		include "VkDeviceMemoryExternalAndroid.hpp"
 #	else
 #		error "Missing VK_ANDROID_external_memory_android_hardware_buffer implementation for this platform!"
 #	endif
 #endif

 #if VK_USE_PLATFORM_FUCHSIA
 #	include "VkDeviceMemoryExternalFuchsia.hpp"
 #endif

 namespace vk {

 VkResult DeviceMemory::Allocate(const VkAllocationCallbacks *pAllocator, const VkMemoryAllocateInfo *pAllocateInfo, VkDeviceMemory *pMemory, Device *device)
 {
 	*pMemory = VK_NULL_HANDLE;

 	vk::DeviceMemory::ExtendedAllocationInfo extendedAllocationInfo = {};
 	VkResult result = vk::DeviceMemory::ParseAllocationInfo(pAllocateInfo, &extendedAllocationInfo);
 	if(result != VK_SUCCESS)
 	{
 		return result;
 	}

 	result = Allocate(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
 	if(result != VK_SUCCESS)
 	{
 		return result;
 	}

 	// Make sure the memory allocation is done now so that OOM errors can be checked now
 	return vk::Cast(*pMemory)->allocate();
 }

 VkResult DeviceMemory::Allocate(const VkAllocationCallbacks *pAllocator, const VkMemoryAllocateInfo *pAllocateInfo, VkDeviceMemory *pMemory,
                                 const vk::DeviceMemory::ExtendedAllocationInfo &extendedAllocationInfo, Device *device)
 {
 #if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 	if(AHardwareBufferExternalMemory::SupportsAllocateInfo(extendedAllocationInfo))
 	{
 		return AHardwareBufferExternalMemory::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
 	}
 #endif
 #if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
 	if(OpaqueFdExternalMemory::SupportsAllocateInfo(extendedAllocationInfo))
 	{
 		return OpaqueFdExternalMemory::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
 	}
 #endif
 #if VK_USE_PLATFORM_FUCHSIA
 	if(zircon::VmoExternalMemory::supportsAllocateInfo(extendedAllocationInfo))
 	{
 		return zircon::VmoExternalMemory::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
 	}
 #endif
 	if(ExternalMemoryHost::SupportsAllocateInfo(extendedAllocationInfo))
 	{
 		return ExternalMemoryHost::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
 	}

 	return vk::DeviceMemoryInternal::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
 }

 DeviceMemory::DeviceMemory(const VkMemoryAllocateInfo *pAllocateInfo, Device *pDevice)
     : allocationSize(pAllocateInfo->allocationSize)
     , memoryTypeIndex(pAllocateInfo->memoryTypeIndex)
     , device(pDevice)
 {
 	ASSERT(allocationSize);
 }

 void DeviceMemory::destroy(const VkAllocationCallbacks *pAllocator)
 {
 #ifdef SWIFTSHADER_DEVICE_MEMORY_REPORT
 	VkDeviceMemoryReportEventTypeEXT eventType = isImport() ? VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_UNIMPORT_EXT : VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_FREE_EXT;
 	device->emitDeviceMemoryReport(eventType, getMemoryObjectId(), 0 /* size */, VK_OBJECT_TYPE_DEVICE_MEMORY, (uint64_t)(void *)VkDeviceMemory(*this));
 #endif  // SWIFTSHADER_DEVICE_MEMORY_REPORT

 	if(buffer)
 	{
 		freeBuffer();
 		buffer = nullptr;
 	}
 }

 size_t DeviceMemory::ComputeRequiredAllocationSize(const VkMemoryAllocateInfo *pAllocateInfo)
 {
 	return 0;
 }

 VkResult DeviceMemory::ParseAllocationInfo(const VkMemoryAllocateInfo *pAllocateInfo, DeviceMemory::ExtendedAllocationInfo *extendedAllocationInfo)
 {
 	const VkBaseInStructure *allocationInfo = reinterpret_cast<const VkBaseInStructure *>(pAllocateInfo->pNext);
 	while(allocationInfo)
 	{
 		switch(allocationInfo->sType)
 		{
 		case VK_STRUCTURE_TYPE_MEMORY_DEDICATED_ALLOCATE_INFO:
 			// This can safely be ignored on most platforms, as the Vulkan spec mentions:
 			// "If the pNext chain includes a VkMemoryDedicatedAllocateInfo structure, then that structure
 			//  includes a handle of the sole buffer or image resource that the memory *can* be bound to."
 #if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 			extendedAllocationInfo->dedicatedAllocateInfo = reinterpret_cast<const VkMemoryDedicatedAllocateInfo *>(allocationInfo);
 #endif
 			break;
 		case VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_FLAGS_INFO:
 			// This extension controls on which physical devices the memory gets allocated.
 			// SwiftShader only has a single physical device, so this extension does nothing in this case.
 			break;
 #if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
 		case VK_STRUCTURE_TYPE_IMPORT_MEMORY_FD_INFO_KHR:
 			extendedAllocationInfo->importMemoryFdInfo = reinterpret_cast<const VkImportMemoryFdInfoKHR *>(allocationInfo);
 			if(extendedAllocationInfo->importMemoryFdInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT)
 			{
 				UNSUPPORTED("extendedAllocationInfo->importMemoryFdInfo->handleType %u", extendedAllocationInfo->importMemoryFdInfo->handleType);
 				return VK_ERROR_INVALID_EXTERNAL_HANDLE;
 			}
 			break;
 #endif  // SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
 		case VK_STRUCTURE_TYPE_EXPORT_MEMORY_ALLOCATE_INFO:
 			extendedAllocationInfo->exportMemoryAllocateInfo = reinterpret_cast<const VkExportMemoryAllocateInfo *>(allocationInfo);
 			switch(extendedAllocationInfo->exportMemoryAllocateInfo->handleTypes)
 			{
 #if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
 			case VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT:
 				break;
 #endif
 #if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 			case VK_EXTERNAL_MEMORY_HANDLE_TYPE_ANDROID_HARDWARE_BUFFER_BIT_ANDROID:
 				break;
 #endif
 #if VK_USE_PLATFORM_FUCHSIA
 			case VK_EXTERNAL_MEMORY_HANDLE_TYPE_ZIRCON_VMO_BIT_FUCHSIA:
 				break;
 #endif
 			default:
 				UNSUPPORTED("extendedAllocationInfo->exportMemoryAllocateInfo->handleTypes %u", extendedAllocationInfo->exportMemoryAllocateInfo->handleTypes);
 				return VK_ERROR_INVALID_EXTERNAL_HANDLE;
 			}
 			break;
 #if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 		case VK_STRUCTURE_TYPE_IMPORT_ANDROID_HARDWARE_BUFFER_INFO_ANDROID:
 			extendedAllocationInfo->importAndroidHardwareBufferInfo = reinterpret_cast<const VkImportAndroidHardwareBufferInfoANDROID *>(allocationInfo);
 			break;
 #endif  // SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 		case VK_STRUCTURE_TYPE_IMPORT_MEMORY_HOST_POINTER_INFO_EXT:
 			extendedAllocationInfo->importMemoryHostPointerInfo = reinterpret_cast<const VkImportMemoryHostPointerInfoEXT *>(allocationInfo);
 			if((extendedAllocationInfo->importMemoryHostPointerInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT) &&
 			   (extendedAllocationInfo->importMemoryHostPointerInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_MAPPED_FOREIGN_MEMORY_BIT_EXT))
 			{
 				UNSUPPORTED("extendedAllocationInfo->importMemoryHostPointerInfo->handleType %u", extendedAllocationInfo->importMemoryHostPointerInfo->handleType);
 				return VK_ERROR_INVALID_EXTERNAL_HANDLE;
 			}
 			break;
 #if VK_USE_PLATFORM_FUCHSIA
 		case VK_STRUCTURE_TYPE_IMPORT_MEMORY_ZIRCON_HANDLE_INFO_FUCHSIA:
 			extendedAllocationInfo->importMemoryZirconHandleInfo = reinterpret_cast<const VkImportMemoryZirconHandleInfoFUCHSIA *>(allocationInfo);
 			if(extendedAllocationInfo->importMemoryZirconHandleInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_ZIRCON_VMO_BIT_FUCHSIA)
 			{
 				UNSUPPORTED("extendedAllocationInfo->importMemoryZirconHandleInfo->handleType %u", extendedAllocationInfo->importMemoryZirconHandleInfo->handleType);
 				return VK_ERROR_INVALID_EXTERNAL_HANDLE;
 			}
 			break;
 #endif  // VK_USE_PLATFORM_FUCHSIA
 		default:
 			UNSUPPORTED("pAllocateInfo->pNext sType = %s", vk::Stringify(allocationInfo->sType).c_str());
 			break;
 		}

 		allocationInfo = allocationInfo->pNext;
 	}

 	return VK_SUCCESS;
 }

 VkResult DeviceMemory::allocate()
 {
 	if(allocationSize > MAX_MEMORY_ALLOCATION_SIZE)
 	{
 #ifdef SWIFTSHADER_DEVICE_MEMORY_REPORT
 		device->emitDeviceMemoryReport(VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_ALLOCATION_FAILED_EXT, 0 /* memoryObjectId */, allocationSize, VK_OBJECT_TYPE_DEVICE_MEMORY, 0 /* objectHandle */);
 #endif  // SWIFTSHADER_DEVICE_MEMORY_REPORT

 		return VK_ERROR_OUT_OF_DEVICE_MEMORY;
 	}

 	VkResult result = VK_SUCCESS;
 	if(!buffer)
 	{
 		result = allocateBuffer();
 	}

 #ifdef SWIFTSHADER_DEVICE_MEMORY_REPORT
 	if(result == VK_SUCCESS)
 	{
 		VkDeviceMemoryReportEventTypeEXT eventType = isImport() ? VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_IMPORT_EXT : VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_ALLOCATE_EXT;
 		device->emitDeviceMemoryReport(eventType, getMemoryObjectId(), allocationSize, VK_OBJECT_TYPE_DEVICE_MEMORY, (uint64_t)(void *)VkDeviceMemory(*this));
 	}
 	else
 	{
 		device->emitDeviceMemoryReport(VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_ALLOCATION_FAILED_EXT, 0 /* memoryObjectId */, allocationSize, VK_OBJECT_TYPE_DEVICE_MEMORY, 0 /* objectHandle */);
 	}
 #endif  // SWIFTSHADER_DEVICE_MEMORY_REPORT

 	return result;
 }

 VkResult DeviceMemory::map(VkDeviceSize pOffset, VkDeviceSize pSize, void **ppData)
 {
 	*ppData = getOffsetPointer(pOffset);

 	return VK_SUCCESS;
 }

 VkDeviceSize DeviceMemory::getCommittedMemoryInBytes() const
 {
 	return allocationSize;
 }

 void *DeviceMemory::getOffsetPointer(VkDeviceSize pOffset) const
 {
 	ASSERT(buffer);
 	return reinterpret_cast<char *>(buffer) + pOffset;
 }

 bool DeviceMemory::checkExternalMemoryHandleType(
     VkExternalMemoryHandleTypeFlags supportedHandleTypes) const
 {
 	if(!supportedHandleTypes)
 	{
 		// This image or buffer does not need to be stored on external
 		// memory, so this check should always pass.
 		return true;
 	}
 	VkExternalMemoryHandleTypeFlagBits handle_type_bit = getFlagBit();
 	if(!handle_type_bit)
 	{
 		// This device memory is not external and can accommodate
 		// any image or buffer as well.
 		return true;
 	}
 	// Return true only if the external memory type is compatible with the
 	// one specified during VkCreate{Image,Buffer}(), through a
 	// VkExternalMemory{Image,Buffer}AllocateInfo struct.
 	return (supportedHandleTypes & handle_type_bit) != 0;
 }

 // Allocate the memory according to `allocationSize`. On success return VK_SUCCESS
 // and sets `buffer`.
 VkResult DeviceMemory::allocateBuffer()
 {
 	buffer = vk::allocateDeviceMemory(allocationSize, REQUIRED_MEMORY_ALIGNMENT);
 	if(!buffer)
 	{
 		return VK_ERROR_OUT_OF_DEVICE_MEMORY;
 	}

 	return VK_SUCCESS;
 }

 // Free previously allocated memory at `buffer`.
 void DeviceMemory::freeBuffer()
 {
 	vk::freeDeviceMemory(buffer);
 	buffer = nullptr;
 }

 // Return the handle type flag bit supported by this implementation.
 // A value of 0 corresponds to non-external memory.
 VkExternalMemoryHandleTypeFlagBits DeviceMemory::getFlagBit() const
 {
 	// Does not support any external memory type at all.
 	static const VkExternalMemoryHandleTypeFlagBits typeFlagBit = (VkExternalMemoryHandleTypeFlagBits)0;
 	return typeFlagBit;
 }

 #if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
 VkResult DeviceMemory::exportFd(int *pFd) const
 {
 	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
 }
 #endif

 #if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
 VkResult DeviceMemory::exportAndroidHardwareBuffer(struct AHardwareBuffer **pAhb) const
 {
 	return VK_ERROR_OUT_OF_HOST_MEMORY;
 }

 VkResult DeviceMemory::GetAndroidHardwareBufferProperties(VkDevice &ahbDevice, const struct AHardwareBuffer *buffer, VkAndroidHardwareBufferPropertiesANDROID *pProperties)
 {
 	return AHardwareBufferExternalMemory::GetAndroidHardwareBufferProperties(ahbDevice, buffer, pProperties);
 }
 #endif

 #if VK_USE_PLATFORM_FUCHSIA
 VkResult DeviceMemory::exportHandle(zx_handle_t *pHandle) const
 {
 	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
 }
 #endif

 }  // namespace vk
	// Copyright 2018 The SwiftShader Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "VkDeviceMemory.hpp"
	#include "VkDeviceMemoryExternalHost.hpp"

	#include "VkBuffer.hpp"
	#include "VkConfig.hpp"
	#include "VkDevice.hpp"
	#include "VkImage.hpp"
	#include "VkMemory.hpp"
	#include "VkStringify.hpp"

	#if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD

	// Helper struct which reads the parsed allocation info and
	// extracts relevant information related to the handle type
	// supported by this DeviceMemory subclass.
	struct OpaqueFdAllocateInfo
	{
	bool importFd = false;
	bool exportFd = false;
	int fd = -1;

	OpaqueFdAllocateInfo() = default;

	// Read the parsed allocation info to initialize an OpaqueFdAllocateInfo.
	OpaqueFdAllocateInfo(const vk::DeviceMemory::ExtendedAllocationInfo &extendedAllocationInfo)
	{
	if(extendedAllocationInfo.importMemoryFdInfo)
	{
	if(extendedAllocationInfo.importMemoryFdInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT)
	{
	UNSUPPORTED("VkImportMemoryFdInfoKHR::handleType %d", int(extendedAllocationInfo.importMemoryFdInfo->handleType));
	}
	importFd = true;
	fd = extendedAllocationInfo.importMemoryFdInfo->fd;
	}

	if(extendedAllocationInfo.exportMemoryAllocateInfo)
	{
	if(extendedAllocationInfo.exportMemoryAllocateInfo->handleTypes != VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT)
	{
	UNSUPPORTED("VkExportMemoryAllocateInfo::handleTypes %d", int(extendedAllocationInfo.exportMemoryAllocateInfo->handleTypes));
	}
	exportFd = true;
	}
	}
	};

	# if defined(__APPLE__)
	# include "VkDeviceMemoryExternalMac.hpp"
	# elif defined(__linux__) && !defined(__ANDROID__)
	# include "VkDeviceMemoryExternalLinux.hpp"
	# else
	# error "Missing VK_KHR_external_memory_fd implementation for this platform!"
	# endif
	#endif

	#if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	# if defined(__ANDROID__)
	# include "VkDeviceMemoryExternalAndroid.hpp"
	# else
	# error "Missing VK_ANDROID_external_memory_android_hardware_buffer implementation for this platform!"
	# endif
	#endif

	#if VK_USE_PLATFORM_FUCHSIA
	# include "VkDeviceMemoryExternalFuchsia.hpp"
	#endif

	namespace vk {

	VkResult DeviceMemory::Allocate(const VkAllocationCallbacks pAllocator, const VkMemoryAllocateInfo pAllocateInfo, VkDeviceMemory pMemory, Device device)
	{
	*pMemory = VK_NULL_HANDLE;

	vk::DeviceMemory::ExtendedAllocationInfo extendedAllocationInfo = {};
	VkResult result = vk::DeviceMemory::ParseAllocationInfo(pAllocateInfo, &extendedAllocationInfo);
	if(result != VK_SUCCESS)
	{
	return result;
	}

	result = Allocate(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
	if(result != VK_SUCCESS)
	{
	return result;
	}

	// Make sure the memory allocation is done now so that OOM errors can be checked now
	return vk::Cast(*pMemory)->allocate();
	}

	VkResult DeviceMemory::Allocate(const VkAllocationCallbacks pAllocator, const VkMemoryAllocateInfo pAllocateInfo, VkDeviceMemory *pMemory,
	const vk::DeviceMemory::ExtendedAllocationInfo &extendedAllocationInfo, Device *device)
	{
	#if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	if(AHardwareBufferExternalMemory::SupportsAllocateInfo(extendedAllocationInfo))
	{
	return AHardwareBufferExternalMemory::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
	}
	#endif
	#if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
	if(OpaqueFdExternalMemory::SupportsAllocateInfo(extendedAllocationInfo))
	{
	return OpaqueFdExternalMemory::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
	}
	#endif
	#if VK_USE_PLATFORM_FUCHSIA
	if(zircon::VmoExternalMemory::supportsAllocateInfo(extendedAllocationInfo))
	{
	return zircon::VmoExternalMemory::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
	}
	#endif
	if(ExternalMemoryHost::SupportsAllocateInfo(extendedAllocationInfo))
	{
	return ExternalMemoryHost::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
	}

	return vk::DeviceMemoryInternal::Create(pAllocator, pAllocateInfo, pMemory, extendedAllocationInfo, device);
	}

	DeviceMemory::DeviceMemory(const VkMemoryAllocateInfo pAllocateInfo, Device pDevice)
	: allocationSize(pAllocateInfo->allocationSize)
	, memoryTypeIndex(pAllocateInfo->memoryTypeIndex)
	, device(pDevice)
	{
	ASSERT(allocationSize);
	}

	void DeviceMemory::destroy(const VkAllocationCallbacks *pAllocator)
	{
	#ifdef SWIFTSHADER_DEVICE_MEMORY_REPORT
	VkDeviceMemoryReportEventTypeEXT eventType = isImport() ? VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_UNIMPORT_EXT : VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_FREE_EXT;
	device->emitDeviceMemoryReport(eventType, getMemoryObjectId(), 0 /* size /, VK_OBJECT_TYPE_DEVICE_MEMORY, (uint64_t)(void )VkDeviceMemory(*this));
	#endif // SWIFTSHADER_DEVICE_MEMORY_REPORT

	if(buffer)
	{
	freeBuffer();
	buffer = nullptr;
	}
	}

	size_t DeviceMemory::ComputeRequiredAllocationSize(const VkMemoryAllocateInfo *pAllocateInfo)
	{
	return 0;
	}

	VkResult DeviceMemory::ParseAllocationInfo(const VkMemoryAllocateInfo pAllocateInfo, DeviceMemory::ExtendedAllocationInfo extendedAllocationInfo)
	{
	const VkBaseInStructure allocationInfo = reinterpret_cast<const VkBaseInStructure >(pAllocateInfo->pNext);
	while(allocationInfo)
	{
	switch(allocationInfo->sType)
	{
	case VK_STRUCTURE_TYPE_MEMORY_DEDICATED_ALLOCATE_INFO:
	// This can safely be ignored on most platforms, as the Vulkan spec mentions:
	// "If the pNext chain includes a VkMemoryDedicatedAllocateInfo structure, then that structure
	// includes a handle of the sole buffer or image resource that the memory can be bound to."
	#if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	extendedAllocationInfo->dedicatedAllocateInfo = reinterpret_cast<const VkMemoryDedicatedAllocateInfo *>(allocationInfo);
	#endif
	break;
	case VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_FLAGS_INFO:
	// This extension controls on which physical devices the memory gets allocated.
	// SwiftShader only has a single physical device, so this extension does nothing in this case.
	break;
	#if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
	case VK_STRUCTURE_TYPE_IMPORT_MEMORY_FD_INFO_KHR:
	extendedAllocationInfo->importMemoryFdInfo = reinterpret_cast<const VkImportMemoryFdInfoKHR *>(allocationInfo);
	if(extendedAllocationInfo->importMemoryFdInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT)
	{
	UNSUPPORTED("extendedAllocationInfo->importMemoryFdInfo->handleType %u", extendedAllocationInfo->importMemoryFdInfo->handleType);
	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
	}
	break;
	#endif // SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
	case VK_STRUCTURE_TYPE_EXPORT_MEMORY_ALLOCATE_INFO:
	extendedAllocationInfo->exportMemoryAllocateInfo = reinterpret_cast<const VkExportMemoryAllocateInfo *>(allocationInfo);
	switch(extendedAllocationInfo->exportMemoryAllocateInfo->handleTypes)
	{
	#if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
	case VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT:
	break;
	#endif
	#if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	case VK_EXTERNAL_MEMORY_HANDLE_TYPE_ANDROID_HARDWARE_BUFFER_BIT_ANDROID:
	break;
	#endif
	#if VK_USE_PLATFORM_FUCHSIA
	case VK_EXTERNAL_MEMORY_HANDLE_TYPE_ZIRCON_VMO_BIT_FUCHSIA:
	break;
	#endif
	default:
	UNSUPPORTED("extendedAllocationInfo->exportMemoryAllocateInfo->handleTypes %u", extendedAllocationInfo->exportMemoryAllocateInfo->handleTypes);
	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
	}
	break;
	#if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	case VK_STRUCTURE_TYPE_IMPORT_ANDROID_HARDWARE_BUFFER_INFO_ANDROID:
	extendedAllocationInfo->importAndroidHardwareBufferInfo = reinterpret_cast<const VkImportAndroidHardwareBufferInfoANDROID *>(allocationInfo);
	break;
	#endif // SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	case VK_STRUCTURE_TYPE_IMPORT_MEMORY_HOST_POINTER_INFO_EXT:
	extendedAllocationInfo->importMemoryHostPointerInfo = reinterpret_cast<const VkImportMemoryHostPointerInfoEXT *>(allocationInfo);
	if((extendedAllocationInfo->importMemoryHostPointerInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_ALLOCATION_BIT_EXT) &&
	(extendedAllocationInfo->importMemoryHostPointerInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_HOST_MAPPED_FOREIGN_MEMORY_BIT_EXT))
	{
	UNSUPPORTED("extendedAllocationInfo->importMemoryHostPointerInfo->handleType %u", extendedAllocationInfo->importMemoryHostPointerInfo->handleType);
	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
	}
	break;
	#if VK_USE_PLATFORM_FUCHSIA
	case VK_STRUCTURE_TYPE_IMPORT_MEMORY_ZIRCON_HANDLE_INFO_FUCHSIA:
	extendedAllocationInfo->importMemoryZirconHandleInfo = reinterpret_cast<const VkImportMemoryZirconHandleInfoFUCHSIA *>(allocationInfo);
	if(extendedAllocationInfo->importMemoryZirconHandleInfo->handleType != VK_EXTERNAL_MEMORY_HANDLE_TYPE_ZIRCON_VMO_BIT_FUCHSIA)
	{
	UNSUPPORTED("extendedAllocationInfo->importMemoryZirconHandleInfo->handleType %u", extendedAllocationInfo->importMemoryZirconHandleInfo->handleType);
	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
	}
	break;
	#endif // VK_USE_PLATFORM_FUCHSIA
	default:
	UNSUPPORTED("pAllocateInfo->pNext sType = %s", vk::Stringify(allocationInfo->sType).c_str());
	break;
	}

	allocationInfo = allocationInfo->pNext;
	}

	return VK_SUCCESS;
	}

	VkResult DeviceMemory::allocate()
	{
	if(allocationSize > MAX_MEMORY_ALLOCATION_SIZE)
	{
	#ifdef SWIFTSHADER_DEVICE_MEMORY_REPORT
	device->emitDeviceMemoryReport(VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_ALLOCATION_FAILED_EXT, 0 /* memoryObjectId /, allocationSize, VK_OBJECT_TYPE_DEVICE_MEMORY, 0 / objectHandle */);
	#endif // SWIFTSHADER_DEVICE_MEMORY_REPORT

	return VK_ERROR_OUT_OF_DEVICE_MEMORY;
	}

	VkResult result = VK_SUCCESS;
	if(!buffer)
	{
	result = allocateBuffer();
	}

	#ifdef SWIFTSHADER_DEVICE_MEMORY_REPORT
	if(result == VK_SUCCESS)
	{
	VkDeviceMemoryReportEventTypeEXT eventType = isImport() ? VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_IMPORT_EXT : VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_ALLOCATE_EXT;
	device->emitDeviceMemoryReport(eventType, getMemoryObjectId(), allocationSize, VK_OBJECT_TYPE_DEVICE_MEMORY, (uint64_t)(void )VkDeviceMemory(this));
	}
	else
	{
	device->emitDeviceMemoryReport(VK_DEVICE_MEMORY_REPORT_EVENT_TYPE_ALLOCATION_FAILED_EXT, 0 /* memoryObjectId /, allocationSize, VK_OBJECT_TYPE_DEVICE_MEMORY, 0 / objectHandle */);
	}
	#endif // SWIFTSHADER_DEVICE_MEMORY_REPORT

	return result;
	}

	VkResult DeviceMemory::map(VkDeviceSize pOffset, VkDeviceSize pSize, void **ppData)
	{
	*ppData = getOffsetPointer(pOffset);

	return VK_SUCCESS;
	}

	VkDeviceSize DeviceMemory::getCommittedMemoryInBytes() const
	{
	return allocationSize;
	}

	void *DeviceMemory::getOffsetPointer(VkDeviceSize pOffset) const
	{
	ASSERT(buffer);
	return reinterpret_cast<char *>(buffer) + pOffset;
	}

	bool DeviceMemory::checkExternalMemoryHandleType(
	VkExternalMemoryHandleTypeFlags supportedHandleTypes) const
	{
	if(!supportedHandleTypes)
	{
	// This image or buffer does not need to be stored on external
	// memory, so this check should always pass.
	return true;
	}
	VkExternalMemoryHandleTypeFlagBits handle_type_bit = getFlagBit();
	if(!handle_type_bit)
	{
	// This device memory is not external and can accommodate
	// any image or buffer as well.
	return true;
	}
	// Return true only if the external memory type is compatible with the
	// one specified during VkCreate{Image,Buffer}(), through a
	// VkExternalMemory{Image,Buffer}AllocateInfo struct.
	return (supportedHandleTypes & handle_type_bit) != 0;
	}

	// Allocate the memory according to `allocationSize`. On success return VK_SUCCESS
	// and sets `buffer`.
	VkResult DeviceMemory::allocateBuffer()
	{
	buffer = vk::allocateDeviceMemory(allocationSize, REQUIRED_MEMORY_ALIGNMENT);
	if(!buffer)
	{
	return VK_ERROR_OUT_OF_DEVICE_MEMORY;
	}

	return VK_SUCCESS;
	}

	// Free previously allocated memory at `buffer`.
	void DeviceMemory::freeBuffer()
	{
	vk::freeDeviceMemory(buffer);
	buffer = nullptr;
	}

	// Return the handle type flag bit supported by this implementation.
	// A value of 0 corresponds to non-external memory.
	VkExternalMemoryHandleTypeFlagBits DeviceMemory::getFlagBit() const
	{
	// Does not support any external memory type at all.
	static const VkExternalMemoryHandleTypeFlagBits typeFlagBit = (VkExternalMemoryHandleTypeFlagBits)0;
	return typeFlagBit;
	}

	#if SWIFTSHADER_EXTERNAL_MEMORY_OPAQUE_FD
	VkResult DeviceMemory::exportFd(int *pFd) const
	{
	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
	}
	#endif

	#if SWIFTSHADER_EXTERNAL_MEMORY_ANDROID_HARDWARE_BUFFER
	VkResult DeviceMemory::exportAndroidHardwareBuffer(struct AHardwareBuffer **pAhb) const
	{
	return VK_ERROR_OUT_OF_HOST_MEMORY;
	}

	VkResult DeviceMemory::GetAndroidHardwareBufferProperties(VkDevice &ahbDevice, const struct AHardwareBuffer buffer, VkAndroidHardwareBufferPropertiesANDROID pProperties)
	{
	return AHardwareBufferExternalMemory::GetAndroidHardwareBufferProperties(ahbDevice, buffer, pProperties);
	}
	#endif

	#if VK_USE_PLATFORM_FUCHSIA
	VkResult DeviceMemory::exportHandle(zx_handle_t *pHandle) const
	{
	return VK_ERROR_INVALID_EXTERNAL_HANDLE;
	}
	#endif

	} // namespace vk