C Specification
The VkPhysicalDeviceLimits
structure is defined as:
typedef struct VkPhysicalDeviceLimits {
uint32_t maxImageDimension1D;
uint32_t maxImageDimension2D;
uint32_t maxImageDimension3D;
uint32_t maxImageDimensionCube;
uint32_t maxImageArrayLayers;
uint32_t maxTexelBufferElements;
uint32_t maxUniformBufferRange;
uint32_t maxStorageBufferRange;
uint32_t maxPushConstantsSize;
uint32_t maxMemoryAllocationCount;
uint32_t maxSamplerAllocationCount;
VkDeviceSize bufferImageGranularity;
VkDeviceSize sparseAddressSpaceSize;
uint32_t maxBoundDescriptorSets;
uint32_t maxPerStageDescriptorSamplers;
uint32_t maxPerStageDescriptorUniformBuffers;
uint32_t maxPerStageDescriptorStorageBuffers;
uint32_t maxPerStageDescriptorSampledImages;
uint32_t maxPerStageDescriptorStorageImages;
uint32_t maxPerStageDescriptorInputAttachments;
uint32_t maxPerStageResources;
uint32_t maxDescriptorSetSamplers;
uint32_t maxDescriptorSetUniformBuffers;
uint32_t maxDescriptorSetUniformBuffersDynamic;
uint32_t maxDescriptorSetStorageBuffers;
uint32_t maxDescriptorSetStorageBuffersDynamic;
uint32_t maxDescriptorSetSampledImages;
uint32_t maxDescriptorSetStorageImages;
uint32_t maxDescriptorSetInputAttachments;
uint32_t maxVertexInputAttributes;
uint32_t maxVertexInputBindings;
uint32_t maxVertexInputAttributeOffset;
uint32_t maxVertexInputBindingStride;
uint32_t maxVertexOutputComponents;
uint32_t maxTessellationGenerationLevel;
uint32_t maxTessellationPatchSize;
uint32_t maxTessellationControlPerVertexInputComponents;
uint32_t maxTessellationControlPerVertexOutputComponents;
uint32_t maxTessellationControlPerPatchOutputComponents;
uint32_t maxTessellationControlTotalOutputComponents;
uint32_t maxTessellationEvaluationInputComponents;
uint32_t maxTessellationEvaluationOutputComponents;
uint32_t maxGeometryShaderInvocations;
uint32_t maxGeometryInputComponents;
uint32_t maxGeometryOutputComponents;
uint32_t maxGeometryOutputVertices;
uint32_t maxGeometryTotalOutputComponents;
uint32_t maxFragmentInputComponents;
uint32_t maxFragmentOutputAttachments;
uint32_t maxFragmentDualSrcAttachments;
uint32_t maxFragmentCombinedOutputResources;
uint32_t maxComputeSharedMemorySize;
uint32_t maxComputeWorkGroupCount[3];
uint32_t maxComputeWorkGroupInvocations;
uint32_t maxComputeWorkGroupSize[3];
uint32_t subPixelPrecisionBits;
uint32_t subTexelPrecisionBits;
uint32_t mipmapPrecisionBits;
uint32_t maxDrawIndexedIndexValue;
uint32_t maxDrawIndirectCount;
float maxSamplerLodBias;
float maxSamplerAnisotropy;
uint32_t maxViewports;
uint32_t maxViewportDimensions[2];
float viewportBoundsRange[2];
uint32_t viewportSubPixelBits;
size_t minMemoryMapAlignment;
VkDeviceSize minTexelBufferOffsetAlignment;
VkDeviceSize minUniformBufferOffsetAlignment;
VkDeviceSize minStorageBufferOffsetAlignment;
int32_t minTexelOffset;
uint32_t maxTexelOffset;
int32_t minTexelGatherOffset;
uint32_t maxTexelGatherOffset;
float minInterpolationOffset;
float maxInterpolationOffset;
uint32_t subPixelInterpolationOffsetBits;
uint32_t maxFramebufferWidth;
uint32_t maxFramebufferHeight;
uint32_t maxFramebufferLayers;
VkSampleCountFlags framebufferColorSampleCounts;
VkSampleCountFlags framebufferDepthSampleCounts;
VkSampleCountFlags framebufferStencilSampleCounts;
VkSampleCountFlags framebufferNoAttachmentsSampleCounts;
uint32_t maxColorAttachments;
VkSampleCountFlags sampledImageColorSampleCounts;
VkSampleCountFlags sampledImageIntegerSampleCounts;
VkSampleCountFlags sampledImageDepthSampleCounts;
VkSampleCountFlags sampledImageStencilSampleCounts;
VkSampleCountFlags storageImageSampleCounts;
uint32_t maxSampleMaskWords;
VkBool32 timestampComputeAndGraphics;
float timestampPeriod;
uint32_t maxClipDistances;
uint32_t maxCullDistances;
uint32_t maxCombinedClipAndCullDistances;
uint32_t discreteQueuePriorities;
float pointSizeRange[2];
float lineWidthRange[2];
float pointSizeGranularity;
float lineWidthGranularity;
VkBool32 strictLines;
VkBool32 standardSampleLocations;
VkDeviceSize optimalBufferCopyOffsetAlignment;
VkDeviceSize optimalBufferCopyRowPitchAlignment;
VkDeviceSize nonCoherentAtomSize;
} VkPhysicalDeviceLimits;
Members

maxImageDimension1D
is the maximum dimension (width
) supported for all images created with animageType
ofVK_IMAGE_TYPE_1D
. 
maxImageDimension2D
is the maximum dimension (width
orheight
) supported for all images created with animageType
ofVK_IMAGE_TYPE_2D
and withoutVK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT
set inflags
. 
maxImageDimension3D
is the maximum dimension (width
,height
, ordepth
) supported for all images created with animageType
ofVK_IMAGE_TYPE_3D
. 
maxImageDimensionCube
is the maximum dimension (width
orheight
) supported for all images created with animageType
ofVK_IMAGE_TYPE_2D
and withVK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT
set inflags
. 
maxImageArrayLayers
is the maximum number of layers (arrayLayers
) for an image. 
maxTexelBufferElements
is the maximum number of addressable texels for a buffer view created on a buffer which was created with theVK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT
orVK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT
set in theusage
member of theVkBufferCreateInfo
structure. 
maxUniformBufferRange
is the maximum value that can be specified in therange
member of any VkDescriptorBufferInfo structures passed to a call to vkUpdateDescriptorSets for descriptors of typeVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
orVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
. 
maxStorageBufferRange
is the maximum value that can be specified in therange
member of any VkDescriptorBufferInfo structures passed to a call to vkUpdateDescriptorSets for descriptors of typeVK_DESCRIPTOR_TYPE_STORAGE_BUFFER
orVK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
. 
maxPushConstantsSize
is the maximum size, in bytes, of the pool of push constant memory. For each of the push constant ranges indicated by thepPushConstantRanges
member of theVkPipelineLayoutCreateInfo
structure, (offset
+size
) must be less than or equal to this limit. 
maxMemoryAllocationCount
is the maximum number of device memory allocations, as created by vkAllocateMemory, which can simultaneously exist. 
maxSamplerAllocationCount
is the maximum number of sampler objects, as created by vkCreateSampler, which can simultaneously exist on a device. 
bufferImageGranularity
is the granularity, in bytes, at which buffer or linear image resources, and optimal image resources can be bound to adjacent offsets in the sameVkDeviceMemory
object without aliasing. See BufferImage Granularity for more details. 
sparseAddressSpaceSize
is the total amount of address space available, in bytes, for sparse memory resources. This is an upper bound on the sum of the size of all sparse resources, regardless of whether any memory is bound to them. 
maxBoundDescriptorSets
is the maximum number of descriptor sets that can be simultaneously used by a pipeline. AllDescriptorSet
decorations in shader modules must have a value less thanmaxBoundDescriptorSets
. See ../../html/vkspec.html#descriptorsetssets. 
maxPerStageDescriptorSamplers
is the maximum number of samplers that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_SAMPLER
orVK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
count against this limit. A descriptor is accessible to a shader stage when thestageFlags
member of theVkDescriptorSetLayoutBinding
structure has the bit for that shader stage set. See ../../html/vkspec.html#descriptorsetssampler and ../../html/vkspec.html#descriptorsetscombinedimagesampler. 
maxPerStageDescriptorUniformBuffers
is the maximum number of uniform buffers that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
orVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
count against this limit. A descriptor is accessible to a shader stage when thestageFlags
member of theVkDescriptorSetLayoutBinding
structure has the bit for that shader stage set. See ../../html/vkspec.html#descriptorsetsuniformbuffer and ../../html/vkspec.html#descriptorsetsuniformbufferdynamic. 
maxPerStageDescriptorStorageBuffers
is the maximum number of storage buffers that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_STORAGE_BUFFER
orVK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
count against this limit. A descriptor is accessible to a pipeline shader stage when thestageFlags
member of theVkDescriptorSetLayoutBinding
structure has the bit for that shader stage set. See ../../html/vkspec.html#descriptorsetsstoragebuffer and ../../html/vkspec.html#descriptorsetsstoragebufferdynamic. 
maxPerStageDescriptorSampledImages
is the maximum number of sampled images that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
,VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE
, orVK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER
count against this limit. A descriptor is accessible to a pipeline shader stage when thestageFlags
member of theVkDescriptorSetLayoutBinding
structure has the bit for that shader stage set. See ../../html/vkspec.html#descriptorsetscombinedimagesampler, ../../html/vkspec.html#descriptorsetssampledimage, and ../../html/vkspec.html#descriptorsetsuniformtexelbuffer. 
maxPerStageDescriptorStorageImages
is the maximum number of storage images that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_STORAGE_IMAGE
, orVK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
count against this limit. A descriptor is accessible to a pipeline shader stage when thestageFlags
member of theVkDescriptorSetLayoutBinding
structure has the bit for that shader stage set. See ../../html/vkspec.html#descriptorsetsstorageimage, and ../../html/vkspec.html#descriptorsetsstoragetexelbuffer. 
maxPerStageDescriptorInputAttachments
is the maximum number of input attachments that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT
count against this limit. A descriptor is accessible to a pipeline shader stage when thestageFlags
member of theVkDescriptorSetLayoutBinding
structure has the bit for that shader stage set. These are only supported for the fragment stage. See ../../html/vkspec.html#descriptorsetsinputattachment. 
maxPerStageResources
is the maximum number of resources that can be accessible to a single shader stage in a pipeline layout. Descriptors with a type ofVK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
,VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE
,VK_DESCRIPTOR_TYPE_STORAGE_IMAGE
,VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER
,VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
,VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
,VK_DESCRIPTOR_TYPE_STORAGE_BUFFER
,VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
,VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
, orVK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT
count against this limit. For the fragment shader stage the framebuffer color attachments also count against this limit. 
maxDescriptorSetSamplers
is the maximum number of samplers that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_SAMPLER
orVK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
count against this limit. See ../../html/vkspec.html#descriptorsetssampler and ../../html/vkspec.html#descriptorsetscombinedimagesampler. 
maxDescriptorSetUniformBuffers
is the maximum number of uniform buffers that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
orVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
count against this limit. See ../../html/vkspec.html#descriptorsetsuniformbuffer and ../../html/vkspec.html#descriptorsetsuniformbufferdynamic. 
maxDescriptorSetUniformBuffersDynamic
is the maximum number of dynamic uniform buffers that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
count against this limit. See ../../html/vkspec.html#descriptorsetsuniformbufferdynamic. 
maxDescriptorSetStorageBuffers
is the maximum number of storage buffers that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_STORAGE_BUFFER
orVK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
count against this limit. See ../../html/vkspec.html#descriptorsetsstoragebuffer and ../../html/vkspec.html#descriptorsetsstoragebufferdynamic. 
maxDescriptorSetStorageBuffersDynamic
is the maximum number of dynamic storage buffers that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
count against this limit. See ../../html/vkspec.html#descriptorsetsstoragebufferdynamic. 
maxDescriptorSetSampledImages
is the maximum number of sampled images that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
,VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE
, orVK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER
count against this limit. See ../../html/vkspec.html#descriptorsetscombinedimagesampler, ../../html/vkspec.html#descriptorsetssampledimage, and ../../html/vkspec.html#descriptorsetsuniformtexelbuffer. 
maxDescriptorSetStorageImages
is the maximum number of storage images that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_STORAGE_IMAGE
, orVK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
count against this limit. See ../../html/vkspec.html#descriptorsetsstorageimage, and ../../html/vkspec.html#descriptorsetsstoragetexelbuffer. 
maxDescriptorSetInputAttachments
is the maximum number of input attachments that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptors with a type ofVK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT
count against this limit. See ../../html/vkspec.html#descriptorsetsinputattachment. 
maxVertexInputAttributes
is the maximum number of vertex input attributes that can be specified for a graphics pipeline. These are described in the array ofVkVertexInputAttributeDescription
structures that are provided at graphics pipeline creation time via thepVertexAttributeDescriptions
member of theVkPipelineVertexInputStateCreateInfo
structure. See ../../html/vkspec.html#fxvertexattrib and ../../html/vkspec.html#fxvertexinput. 
maxVertexInputBindings
is the maximum number of vertex buffers that can be specified for providing vertex attributes to a graphics pipeline. These are described in the array ofVkVertexInputBindingDescription
structures that are provided at graphics pipeline creation time via thepVertexBindingDescriptions
member of theVkPipelineVertexInputStateCreateInfo
structure. Thebinding
member ofVkVertexInputBindingDescription
must be less than this limit. See ../../html/vkspec.html#fxvertexinput. 
maxVertexInputAttributeOffset
is the maximum vertex input attribute offset that can be added to the vertex input binding stride. Theoffset
member of theVkVertexInputAttributeDescription
structure must be less than or equal to this limit. See ../../html/vkspec.html#fxvertexinput. 
maxVertexInputBindingStride
is the maximum vertex input binding stride that can be specified in a vertex input binding. Thestride
member of theVkVertexInputBindingDescription
structure must be less than or equal to this limit. See ../../html/vkspec.html#fxvertexinput. 
maxVertexOutputComponents
is the maximum number of components of output variables which can be output by a vertex shader. See ../../html/vkspec.html#shadersvertex. 
maxTessellationGenerationLevel
is the maximum tessellation generation level supported by the fixedfunction tessellation primitive generator. See ../../html/vkspec.html#tessellation. 
maxTessellationPatchSize
is the maximum patch size, in vertices, of patches that can be processed by the tessellation control shader and tessellation primitive generator. ThepatchControlPoints
member of theVkPipelineTessellationStateCreateInfo
structure specified at pipeline creation time and the value provided in theOutputVertices
execution mode of shader modules must be less than or equal to this limit. See ../../html/vkspec.html#tessellation. 
maxTessellationControlPerVertexInputComponents
is the maximum number of components of input variables which can be provided as pervertex inputs to the tessellation control shader stage. 
maxTessellationControlPerVertexOutputComponents
is the maximum number of components of pervertex output variables which can be output from the tessellation control shader stage. 
maxTessellationControlPerPatchOutputComponents
is the maximum number of components of perpatch output variables which can be output from the tessellation control shader stage. 
maxTessellationControlTotalOutputComponents
is the maximum total number of components of pervertex and perpatch output variables which can be output from the tessellation control shader stage. 
maxTessellationEvaluationInputComponents
is the maximum number of components of input variables which can be provided as pervertex inputs to the tessellation evaluation shader stage. 
maxTessellationEvaluationOutputComponents
is the maximum number of components of pervertex output variables which can be output from the tessellation evaluation shader stage. 
maxGeometryShaderInvocations
is the maximum invocation count supported for instanced geometry shaders. The value provided in theInvocations
execution mode of shader modules must be less than or equal to this limit. See ../../html/vkspec.html#geometry. 
maxGeometryInputComponents
is the maximum number of components of input variables which can be provided as inputs to the geometry shader stage. 
maxGeometryOutputComponents
is the maximum number of components of output variables which can be output from the geometry shader stage. 
maxGeometryOutputVertices
is the maximum number of vertices which can be emitted by any geometry shader. 
maxGeometryTotalOutputComponents
is the maximum total number of components of output, across all emitted vertices, which can be output from the geometry shader stage. 
maxFragmentInputComponents
is the maximum number of components of input variables which can be provided as inputs to the fragment shader stage. 
maxFragmentOutputAttachments
is the maximum number of output attachments which can be written to by the fragment shader stage. 
maxFragmentDualSrcAttachments
is the maximum number of output attachments which can be written to by the fragment shader stage when blending is enabled and one of the dual source blend modes is in use. See ../../html/vkspec.html#framebufferdsb and dualSrcBlend. 
maxFragmentCombinedOutputResources
is the total number of storage buffers, storage images, and output buffers which can be used in the fragment shader stage. 
maxComputeSharedMemorySize
is the maximum total storage size, in bytes, of all variables declared with theWorkgroupLocal
storage class in shader modules (or with theshared
storage qualifier in GLSL) in the compute shader stage. 
maxComputeWorkGroupCount
[3] is the maximum number of local workgroups that can be dispatched by a single dispatch command. These three values represent the maximum number of local workgroups for the X, Y, and Z dimensions, respectively. The workgroup count parameters to the dispatch commands must be less than or equal to the corresponding limit. See ../../html/vkspec.html#dispatch. 
maxComputeWorkGroupInvocations
is the maximum total number of compute shader invocations in a single local workgroup. The product of the X, Y, and Z sizes as specified by theLocalSize
execution mode in shader modules and by the object decorated by theWorkgroupSize
decoration must be less than or equal to this limit. 
maxComputeWorkGroupSize
[3] is the maximum size of a local compute workgroup, per dimension. These three values represent the maximum local workgroup size in the X, Y, and Z dimensions, respectively. Thex
,y
, andz
sizes specified by theLocalSize
execution mode and by the object decorated by theWorkgroupSize
decoration in shader modules must be less than or equal to the corresponding limit. 
subPixelPrecisionBits
is the number of bits of subpixel precision in framebuffer coordinates x_{f} and y_{f}. See ../../html/vkspec.html#primsrast. 
subTexelPrecisionBits
is the number of bits of precision in the division along an axis of an image used for minification and magnification filters. 2^{subTexelPrecisionBits} is the actual number of divisions along each axis of the image represented. The filtering hardware will snap to these locations when computing the filtered results. 
mipmapPrecisionBits
is the number of bits of division that the LOD calculation for mipmap fetching get snapped to when determining the contribution from each mip level to the mip filtered results. 2^{mipmapPrecisionBits} is the actual number of divisions.NoteFor example, if this value is 2 bits then when linearly filtering between two levels, each level could: contribute: 0%, 33%, 66%, or 100% (this is just an example and the amount of contribution should be covered by different equations in the spec).

maxDrawIndexedIndexValue
is the maximum index value that can be used for indexed draw calls when using 32bit indices. This excludes the primitive restart index value of 0xFFFFFFFF. See fullDrawIndexUint32. 
maxDrawIndirectCount
is the maximum draw count that is supported for indirect draw calls. See multiDrawIndirect. 
maxSamplerLodBias
is the maximum absolute sampler LOD bias. The sum of themipLodBias
member of theVkSamplerCreateInfo
structure and theBias
operand of image sampling operations in shader modules (or 0 if noBias
operand is provided to an image sampling operation) are clamped to the range [maxSamplerLodBias
,+maxSamplerLodBias
]. See ../../html/vkspec.html#samplersmipLodBias. 
maxSamplerAnisotropy
is the maximum degree of sampler anisotropy. The maximum degree of anisotropic filtering used for an image sampling operation is the minimum of themaxAnisotropy
member of theVkSamplerCreateInfo
structure and this limit. See ../../html/vkspec.html#samplersmaxAnisotropy. 
maxViewports
is the maximum number of active viewports. TheviewportCount
member of theVkPipelineViewportStateCreateInfo
structure that is provided at pipeline creation must be less than or equal to this limit. 
maxViewportDimensions
[2] are the maximum viewport dimensions in the X (width) and Y (height) dimensions, respectively. The maximum viewport dimensions must be greater than or equal to the largest image which can be created and used as a framebuffer attachment. See Controlling the Viewport. 
viewportBoundsRange
[2] is the [minimum, maximum] range that the corners of a viewport must be contained in. This range must be at least [2 ×size
, 2 ×size
 1], wheresize
= max(maxViewportDimensions
[0],maxViewportDimensions
[1]). See Controlling the Viewport.NoteThe intent of the
viewportBoundsRange
limit is to allow a maximum sized viewport to be arbitrarily shifted relative to the output target as long as at least some portion intersects. This would give a bounds limit of [size
+ 1, 2 ×size
 1] which would allow all possible nonemptyset intersections of the output target and the viewport. Since these numbers are typically powers of two, picking the signed number range using the smallest possible number of bits ends up with the specified range. 
viewportSubPixelBits
is the number of bits of subpixel precision for viewport bounds. The subpixel precision that floatingpoint viewport bounds are interpreted at is given by this limit. 
minMemoryMapAlignment
is the minimum required alignment, in bytes, of host visible memory allocations within the host address space. When mapping a memory allocation with vkMapMemory, subtractingoffset
bytes from the returned pointer will always produce an integer multiple of this limit. See ../../html/vkspec.html#memorydevicehostaccess. 
minTexelBufferOffsetAlignment
is the minimum required alignment, in bytes, for theoffset
member of theVkBufferViewCreateInfo
structure for texel buffers. When a buffer view is created for a buffer which was created withVK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT
orVK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT
set in theusage
member of theVkBufferCreateInfo
structure, theoffset
must be an integer multiple of this limit. 
minUniformBufferOffsetAlignment
is the minimum required alignment, in bytes, for theoffset
member of theVkDescriptorBufferInfo
structure for uniform buffers. When a descriptor of typeVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
orVK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
is updated, theoffset
must be an integer multiple of this limit. Similarly, dynamic offsets for uniform buffers must be multiples of this limit. 
minStorageBufferOffsetAlignment
is the minimum required alignment, in bytes, for theoffset
member of theVkDescriptorBufferInfo
structure for storage buffers. When a descriptor of typeVK_DESCRIPTOR_TYPE_STORAGE_BUFFER
orVK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
is updated, theoffset
must be an integer multiple of this limit. Similarly, dynamic offsets for storage buffers must be multiples of this limit. 
minTexelOffset
is the minimum offset value for theConstOffset
image operand of any of theOpImageSample
* orOpImageFetch
* image instructions. 
maxTexelOffset
is the maximum offset value for theConstOffset
image operand of any of theOpImageSample
* orOpImageFetch
* image instructions. 
minTexelGatherOffset
is the minimum offset value for theOffset
orConstOffsets
image operands of any of theOpImage
*Gather
image instructions. 
maxTexelGatherOffset
is the maximum offset value for theOffset
orConstOffsets
image operands of any of theOpImage
*Gather
image instructions. 
minInterpolationOffset
is the minimum negative offset value for theoffset
operand of theInterpolateAtOffset
extended instruction. 
maxInterpolationOffset
is the maximum positive offset value for theoffset
operand of theInterpolateAtOffset
extended instruction. 
subPixelInterpolationOffsetBits
is the number of subpixel fractional bits that thex
andy
offsets to theInterpolateAtOffset
extended instruction may be rounded to as fixedpoint values. 
maxFramebufferWidth
is the maximum width for a framebuffer. Thewidth
member of theVkFramebufferCreateInfo
structure must be less than or equal to this limit. 
maxFramebufferHeight
is the maximum height for a framebuffer. Theheight
member of theVkFramebufferCreateInfo
structure must be less than or equal to this limit. 
maxFramebufferLayers
is the maximum layer count for a layered framebuffer. Thelayers
member of theVkFramebufferCreateInfo
structure must be less than or equal to this limit. 
framebufferColorSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the color sample counts that are supported for all framebuffer color attachments with floating or fixedpoint formats. There is no limit that indicates the color sample counts that are supported for all color attachments with integer formats. 
framebufferDepthSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the supported depth sample counts for all framebuffer depth/stencil attachments, when the format includes a depth component. 
framebufferStencilSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the supported stencil sample counts for all framebuffer depth/stencil attachments, when the format includes a stencil component. 
framebufferNoAttachmentsSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the supported sample counts for a framebuffer with no attachments. 
maxColorAttachments
is the maximum number of color attachments that can be used by a subpass in a render pass. ThecolorAttachmentCount
member of theVkSubpassDescription
structure must be less than or equal to this limit. 
sampledImageColorSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the sample counts supported for all 2D images created withVK_IMAGE_TILING_OPTIMAL
,usage
containingVK_IMAGE_USAGE_SAMPLED_BIT
, and a noninteger color format. 
sampledImageIntegerSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the sample counts supported for all 2D images created withVK_IMAGE_TILING_OPTIMAL
,usage
containingVK_IMAGE_USAGE_SAMPLED_BIT
, and an integer color format. 
sampledImageDepthSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the sample counts supported for all 2D images created withVK_IMAGE_TILING_OPTIMAL
,usage
containingVK_IMAGE_USAGE_SAMPLED_BIT
, and a depth format. 
sampledImageStencilSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the sample supported for all 2D images created withVK_IMAGE_TILING_OPTIMAL
,usage
containingVK_IMAGE_USAGE_SAMPLED_BIT
, and a stencil format. 
storageImageSampleCounts
is a bitmask^{1} of VkSampleCountFlagBits indicating the sample counts supported for all 2D images created withVK_IMAGE_TILING_OPTIMAL
, andusage
containingVK_IMAGE_USAGE_STORAGE_BIT
. 
maxSampleMaskWords
is the maximum number of array elements of a variable decorated with theSampleMask
builtin decoration. 
timestampComputeAndGraphics
indicates support for timestamps on all graphics and compute queues. If this limit is set toVK_TRUE
, all queues that advertise theVK_QUEUE_GRAPHICS_BIT
orVK_QUEUE_COMPUTE_BIT
in theVkQueueFamilyProperties
::queueFlags
supportVkQueueFamilyProperties
::timestampValidBits
of at least 36. See Timestamp Queries. 
timestampPeriod
is the number of nanoseconds required for a timestamp query to be incremented by 1. See Timestamp Queries. 
maxClipDistances
is the maximum number of clip distances that can be used in a single shader stage. The size of any array declared with theClipDistance
builtin decoration in a shader module must be less than or equal to this limit. 
maxCullDistances
is the maximum number of cull distances that can be used in a single shader stage. The size of any array declared with theCullDistance
builtin decoration in a shader module must be less than or equal to this limit. 
maxCombinedClipAndCullDistances
is the maximum combined number of clip and cull distances that can be used in a single shader stage. The sum of the sizes of any pair of arrays declared with theClipDistance
andCullDistance
builtin decoration used by a single shader stage in a shader module must be less than or equal to this limit. 
discreteQueuePriorities
is the number of discrete priorities that can be assigned to a queue based on the value of each member ofVkDeviceQueueCreateInfo
::pQueuePriorities
. This must be at least 2, and levels must be spread evenly over the range, with at least one level at 1.0, and another at 0.0. See ../../html/vkspec.html#devsandqueuespriority. 
pointSizeRange
[2] is the range [minimum
,maximum
] of supported sizes for points. Values written to variables decorated with thePointSize
builtin decoration are clamped to this range. 
lineWidthRange
[2] is the range [minimum
,maximum
] of supported widths for lines. Values specified by thelineWidth
member of theVkPipelineRasterizationStateCreateInfo
or thelineWidth
parameter tovkCmdSetLineWidth
are clamped to this range. 
pointSizeGranularity
is the granularity of supported point sizes. Not all point sizes in the range defined bypointSizeRange
are supported. This limit specifies the granularity (or increment) between successive supported point sizes. 
lineWidthGranularity
is the granularity of supported line widths. Not all line widths in the range defined bylineWidthRange
are supported. This limit specifies the granularity (or increment) between successive supported line widths. 
strictLines
indicates whether lines are rasterized according to the preferred method of rasterization. If set toVK_FALSE
, lines may be rasterized under a relaxed set of rules. If set toVK_TRUE
, lines are rasterized as per the strict definition. See Basic Line Segment Rasterization. 
standardSampleLocations
indicates whether rasterization uses the standard sample locations as documented in Multisampling. If set toVK_TRUE
, the implementation uses the documented sample locations. If set toVK_FALSE
, the implementation may use different sample locations. 
optimalBufferCopyOffsetAlignment
is the optimal buffer offset alignment in bytes forvkCmdCopyBufferToImage
andvkCmdCopyImageToBuffer
. The per texel alignment requirements are enforced, but applications should use the optimal alignment for optimal performance and power use. 
optimalBufferCopyRowPitchAlignment
is the optimal buffer row pitch alignment in bytes forvkCmdCopyBufferToImage
andvkCmdCopyImageToBuffer
. Row pitch is the number of bytes between texels with the same X coordinate in adjacent rows (Y coordinates differ by one). The per texel alignment requirements are enforced, but applications should use the optimal alignment for optimal performance and power use. 
nonCoherentAtomSize
is the size and alignment in bytes that bounds concurrent access to hostmapped device memory.
Description
 1

For all bitmasks of VkSampleCountFlagBits, the sample count limits defined above represent the minimum supported sample counts for each image type. Individual images may support additional sample counts, which are queried using vkGetPhysicalDeviceImageFormatProperties as described in Supported Sample Counts.
See Also
VkBool32
, VkDeviceSize
, VkPhysicalDeviceProperties, VkSampleCountFlags
Document Notes
For more information, see the Vulkan Specification at URL
This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.
Copyright
Copyright (c) 20142018 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.