130 lines
3.8 KiB
Plaintext
130 lines
3.8 KiB
Plaintext
include::meta/VK_NV_dedicated_allocation.txt[]
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*Last Modified Date*::
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2016-05-31
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*IP Status*::
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No known IP claims.
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*Contributors*::
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- Jeff Bolz, NVIDIA
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This extension allows device memory to be allocated for a particular buffer
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or image resource, which on some devices can significantly improve the
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performance of that resource.
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Normal device memory allocations must support memory aliasing and sparse
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binding, which could interfere with optimizations like framebuffer
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compression or efficient page table usage.
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This is important for render targets and very large resources, but need not
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(and probably should not) be used for smaller resources that can benefit
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from suballocation.
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This extension adds a few small structures to resource creation and memory
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allocation: a new structure that flags whether am image/buffer will have a
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dedicated allocation, and a structure indicating the image or buffer that an
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allocation will be bound to.
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=== New Object Types
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None.
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=== New Enum Constants
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* Extending elink:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_DEDICATED_ALLOCATION_IMAGE_CREATE_INFO_NV
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** ename:VK_STRUCTURE_TYPE_DEDICATED_ALLOCATION_BUFFER_CREATE_INFO_NV
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** ename:VK_STRUCTURE_TYPE_DEDICATED_ALLOCATION_MEMORY_ALLOCATE_INFO_NV
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=== New Enums
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None.
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=== New Structures
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* slink:VkDedicatedAllocationImageCreateInfoNV
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* slink:VkDedicatedAllocationBufferCreateInfoNV
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* slink:VkDedicatedAllocationMemoryAllocateInfoNV
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=== New Functions
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None.
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=== Issues
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None.
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=== Examples
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[source,c++]
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--------------------------------------
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// Create an image with
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// VkDedicatedAllocationImageCreateInfoNV::dedicatedAllocation
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// set to VK_TRUE
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VkDedicatedAllocationImageCreateInfoNV dedicatedImageInfo =
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{
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VK_STRUCTURE_TYPE_DEDICATED_ALLOCATION_IMAGE_CREATE_INFO_NV, // sType
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NULL, // pNext
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VK_TRUE, // dedicatedAllocation
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};
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VkImageCreateInfo imageCreateInfo =
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{
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VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO, // sType
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&dedicatedImageInfo // pNext
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// Other members set as usual
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};
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VkImage image;
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VkResult result = vkCreateImage(
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device,
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&imageCreateInfo,
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NULL, // pAllocator
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&image);
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VkMemoryRequirements memoryRequirements;
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vkGetImageMemoryRequirements(
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device,
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image,
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&memoryRequirements);
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// Allocate memory with VkDedicatedAllocationMemoryAllocateInfoNV::image
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// pointing to the image we are allocating the memory for
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VkDedicatedAllocationMemoryAllocateInfoNV dedicatedInfo =
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{
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VK_STRUCTURE_TYPE_DEDICATED_ALLOCATION_MEMORY_ALLOCATE_INFO_NV, // sType
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NULL, // pNext
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image, // image
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VK_NULL_HANDLE, // buffer
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};
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VkMemoryAllocateInfo memoryAllocateInfo =
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{
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VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO, // sType
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&dedicatedInfo, // pNext
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memoryRequirements.size, // allocationSize
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FindMemoryTypeIndex(memoryRequirements.memoryTypeBits), // memoryTypeIndex
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};
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VkDeviceMemory memory;
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vkAllocateMemory(
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device,
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&memoryAllocateInfo,
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NULL, // pAllocator
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&memory);
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// Bind the image to the memory
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vkBindImageMemory(
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device,
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image,
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memory,
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0);
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--------------------------------------
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=== Version History
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* Revision 1, 2016-05-31 (Jeff Bolz)
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- Internal revisions
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