20. Drawing Commands

Drawing commands (commands with Draw in the name) provoke work in a graphics pipeline. Drawing commands are recorded into a command buffer and when executed by a queue, will produce work which executes according to the bound graphics pipeline. A graphics pipeline must be bound to a command buffer before any drawing commands are recorded in that command buffer.

Each draw is made up of zero or more vertices and zero or more instances, which are processed by the device and result in the assembly of primitives. Primitives are assembled according to the pInputAssemblyState member of the VkGraphicsPipelineCreateInfo structure, which is of type VkPipelineInputAssemblyStateCreateInfo:

// Provided by VK_VERSION_1_0
typedef struct VkPipelineInputAssemblyStateCreateInfo {
VkStructureType                            sType;
const void*                                pNext;
VkPipelineInputAssemblyStateCreateFlags    flags;
VkPrimitiveTopology                        topology;
VkBool32                                   primitiveRestartEnable;
} VkPipelineInputAssemblyStateCreateInfo;
• sType is the type of this structure.

• pNext is NULL or a pointer to a structure extending this structure.

• flags is reserved for future use.

• topology is a VkPrimitiveTopology defining the primitive topology, as described below.

• primitiveRestartEnable controls whether a special vertex index value is treated as restarting the assembly of primitives. This enable only applies to indexed draws (vkCmdDrawIndexed, and vkCmdDrawIndexedIndirect), and the special index value is either 0xFFFFFFFF when the indexType parameter of vkCmdBindIndexBuffer is equal to VK_INDEX_TYPE_UINT32, or 0xFFFF when indexType is equal to VK_INDEX_TYPE_UINT16. Primitive restart is not allowed for “list” topologies.

Restarting the assembly of primitives discards the most recent index values if those elements formed an incomplete primitive, and restarts the primitive assembly using the subsequent indices, but only assembling the immediately following element through the end of the originally specified elements. The primitive restart index value comparison is performed before adding the vertexOffset value to the index value.

Valid Usage
• VUID-VkPipelineInputAssemblyStateCreateInfo-topology-00428
If topology is VK_PRIMITIVE_TOPOLOGY_POINT_LIST, VK_PRIMITIVE_TOPOLOGY_LINE_LIST, VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, VK_PRIMITIVE_TOPOLOGY_LINE_LIST_WITH_ADJACENCY, VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST_WITH_ADJACENCY or VK_PRIMITIVE_TOPOLOGY_PATCH_LIST, primitiveRestartEnable must be VK_FALSE

• VUID-VkPipelineInputAssemblyStateCreateInfo-topology-00429
If the geometry shaders feature is not enabled, topology must not be any of VK_PRIMITIVE_TOPOLOGY_LINE_LIST_WITH_ADJACENCY, VK_PRIMITIVE_TOPOLOGY_LINE_STRIP_WITH_ADJACENCY, VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST_WITH_ADJACENCY or VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP_WITH_ADJACENCY

• VUID-VkPipelineInputAssemblyStateCreateInfo-topology-00430
If the tessellation shaders feature is not enabled, topology must not be VK_PRIMITIVE_TOPOLOGY_PATCH_LIST

• VUID-VkPipelineInputAssemblyStateCreateInfo-triangleFans-04452
If the VK_KHR_portability_subset extension is enabled, and VkPhysicalDevicePortabilitySubsetFeaturesKHR::triangleFans is VK_FALSE, topology must not be VK_PRIMITIVE_TOPOLOGY_TRIANGLE_FAN.

Valid Usage (Implicit)
• VUID-VkPipelineInputAssemblyStateCreateInfo-sType-sType
sType must be VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO

• VUID-VkPipelineInputAssemblyStateCreateInfo-pNext-pNext
pNext must be NULL

flags must be 0

• VUID-VkPipelineInputAssemblyStateCreateInfo-topology-parameter
topology must be a valid VkPrimitiveTopology value

// Provided by VK_VERSION_1_0
typedef VkFlags VkPipelineInputAssemblyStateCreateFlags;

VkPipelineInputAssemblyStateCreateFlags is a bitmask type for setting a mask, but is currently reserved for future use.

20.1. Primitive Topologies

Primitive topology determines how consecutive vertices are organized into primitives, and determines the type of primitive that is used at the beginning of the graphics pipeline. The effective topology for later stages of the pipeline is altered by tessellation or geometry shading (if either is in use) and depends on the execution modes of those shaders.

The primitive topologies defined by VkPrimitiveTopology are:

// Provided by VK_VERSION_1_0
typedef enum VkPrimitiveTopology {
VK_PRIMITIVE_TOPOLOGY_POINT_LIST = 0,
VK_PRIMITIVE_TOPOLOGY_LINE_LIST = 1,
VK_PRIMITIVE_TOPOLOGY_LINE_STRIP = 2,
VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST = 3,
VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP = 4,
VK_PRIMITIVE_TOPOLOGY_TRIANGLE_FAN = 5,
VK_PRIMITIVE_TOPOLOGY_PATCH_LIST = 10,
} VkPrimitiveTopology;

Each primitive topology, and its construction from a list of vertices, is described in detail below with a supporting diagram, according to the following key:

 image/svg+xml Vertex A point in 3-dimensional space. Positions chosen within the diagrams are arbitrary and for illustration only. image/svg+xml 5 Vertex Number Sequence position of a vertex within the provided vertex data. image/svg+xml Provoking Vertex Provoking vertex within the main primitive. The tail is angled towards the relevant primitive. Used in flat shading. image/svg+xml Primitive Edge An edge connecting the points of a main primitive. image/svg+xml Adjacency Edge Points connected by these lines do not contribute to a main primitive, and are only accessible in a geometry shader. image/svg+xml Winding Order The relative order in which vertices are defined within a primitive, used in the facing determination. This ordering has no specific start or end point.

The diagrams are supported with mathematical definitions where the vertices (v) and primitives (p) are numbered starting from 0; v0 is the first vertex in the provided data and p0 is the first primitive in the set of primitives defined by the vertices and topology.

20.1.1. Point Lists

When the topology is VK_PRIMITIVE_TOPOLOGY_POINT_LIST, each consecutive vertex defines a single point primitive, according to the equation:

pi = {vi}

As there is only one vertex, that vertex is the provoking vertex. The number of primitives generated is equal to vertexCount.

20.1.2. Line Lists

When the topology is VK_PRIMITIVE_TOPOLOGY_LINE_LIST, each consecutive pair of vertices defines a single line primitive, according to the equation:

pi = {v2i, v2i+1}

The number of primitives generated is equal to vertexCount/2⌋.

The provoking vertex for pi is v2i.

20.1.3. Line Strips

When the topology is VK_PRIMITIVE_TOPOLOGY_LINE_STRIP, one line primitive is defined by each vertex and the following vertex, according to the equation:

pi = {vi, vi+1}

The number of primitives generated is equal to max(0,vertexCount-1).

The provoking vertex for pi is vi.

20.1.4. Triangle Lists

When the topology is VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, each consecutive set of three vertices defines a single triangle primitive, according to the equation:

pi = {v3i, v3i+1, v3i+2}

The number of primitives generated is equal to vertexCount/3⌋.

The provoking vertex for pi is v3i.

20.1.5. Triangle Strips

When the topology is VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP, one triangle primitive is defined by each vertex and the two vertices that follow it, according to the equation:

pi = {vi, vi+(1+i%2), vi+(2-i%2)}

The number of primitives generated is equal to max(0,vertexCount-2).

The provoking vertex for pi is vi.

 Note The ordering of the vertices in each successive triangle is reversed, so that the winding order is consistent throughout the strip.

20.1.6. Triangle Fans

When the topology is VK_PRIMITIVE_TOPOLOGY_TRIANGLE_FAN, triangle primitives are defined around a shared common vertex, according to the equation:

pi = {vi+1, vi+2, v0}

The number of primitives generated is equal to max(0,vertexCount-2).

The provoking vertex for pi is vi+1.

 Note If the VK_KHR_portability_subset extension is enabled, and VkPhysicalDevicePortabilitySubsetFeaturesKHR::triangleFans is VK_FALSE, then triangle fans are not supported by the implementation, and VK_PRIMITIVE_TOPOLOGY_TRIANGLE_FAN must not be used.

When the topology is VK_PRIMITIVE_TOPOLOGY_LINE_LIST_WITH_ADJACENCY, each consecutive set of four vertices defines a single line primitive with adjacency, according to the equation:

pi = {v4i, v4i+1, v4i+2,v4i+3}

A line primitive is described by the second and third vertices of the total primitive, with the remaining two vertices only accessible in a geometry shader.

The number of primitives generated is equal to vertexCount/4⌋.

The provoking vertex for pi is v4i+1.

When the topology is VK_PRIMITIVE_TOPOLOGY_LINE_STRIP_WITH_ADJACENCY, one line primitive with adjacency is defined by each vertex and the following vertex, according to the equation:

pi = {vi, vi+1, vi+2, vi+3}

A line primitive is described by the second and third vertices of the total primitive, with the remaining two vertices only accessible in a geometry shader.

The number of primitives generated is equal to max(0,vertexCount-3).

The provoking vertex for pi is vi+1.

When the topology is VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST_WITH_ADJACENCY, each consecutive set of six vertices defines a single triangle primitive with adjacency, according to the equations:

pi = {v6i, v6i+1, v6i+2, v6i+3, v6i+4, v6i+5}

A triangle primitive is described by the first, third, and fifth vertices of the total primitive, with the remaining three vertices only accessible in a geometry shader.

The number of primitives generated is equal to vertexCount/6⌋.

The provoking vertex for pi is v6i.

When the topology is VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP_WITH_ADJACENCY, one triangle primitive with adjacency is defined by each vertex and the following 5 vertices.

The number of primitives generated, n, is equal to ⌊max(0, vertexCount - 4)/2⌋.

If n=1, the primitive is defined as:

p = {v0, v1, v2, v5, v4, v3}

If n>1, the total primitive consists of different vertices according to where it is in the strip:

pi = {v2i, v2i+1, v2i+2, v2i+6, v2i+4, v2i+3} when i=0

pi = {v2i, v2i+3, v2i+4, v2i+6, v2i+2, v2i-2} when i>0, i<n-1, and i%2=1

pi = {v2i, v2i-2, v2i+2, v2i+6, v2i+4, v2i+3} when i>0, i<n-1, and i%2=0

pi = {v2i, v2i+3, v2i+4, v2i+5, v2i+2, v2i-2} when i=n-1 and i%2=1

pi = {v2i, v2i-2, v2i+2, v2i+5, v2i+4, v2i+3} when i=n-1 and i%2=0

A triangle primitive is described by the first, third, and fifth vertices of the total primitive in all cases, with the remaining three vertices only accessible in a geometry shader.

 Note The ordering of the vertices in each successive triangle is altered so that the winding order is consistent throughout the strip.

The provoking vertex for pi is always v2i.

20.1.11. Patch Lists

When the topology is VK_PRIMITIVE_TOPOLOGY_PATCH_LIST, each consecutive set of m vertices defines a single patch primitive, according to the equation:

pi = {vmi, vmi+1, …​, vmi+(m-2), vmi+(m-1)}

where m is equal to VkPipelineTessellationStateCreateInfo::patchControlPoints.

Patch lists are never passed to vertex post-processing, and as such no provoking vertex is defined for patch primitives. The number of primitives generated is equal to vertexCount/m⌋.

The vertices comprising a patch have no implied geometry, and are used as inputs to tessellation shaders and the fixed-function tessellator to generate new point, line, or triangle primitives.

20.2. Primitive Order

Primitives generated by drawing commands progress through the stages of the graphics pipeline in primitive order. Primitive order is initially determined in the following way:

1. Submission order determines the initial ordering

2. For indirect drawing commands, the order in which accessed instances of the VkDrawIndirectCommand are stored in buffer, from lower indirect buffer addresses to higher addresses.

3. If a drawing command includes multiple instances, the order in which instances are executed, from lower numbered instances to higher.

4. The order in which primitives are specified by a drawing command:

• For non-indexed draws, from vertices with a lower numbered vertexIndex to a higher numbered vertexIndex.

• For indexed draws, vertices sourced from a lower index buffer addresses to higher addresses.

Within this order implementations further sort primitives:

1. If tessellation shading is active, by an implementation-dependent order of new primitives generated by tessellation.

2. If geometry shading is active, by the order new primitives are generated by geometry shading.

3. If the polygon mode is not VK_POLYGON_MODE_FILL, by an implementation-dependent ordering of the new primitives generated within the original primitive.

Primitive order is later used to define rasterization order, which determines the order in which fragments output results to a framebuffer.

Once primitives are assembled, they proceed to the vertex shading stage of the pipeline. If the draw includes multiple instances, then the set of primitives is sent to the vertex shading stage multiple times, once for each instance.

It is implementation-dependent whether vertex shading occurs on vertices that are discarded as part of incomplete primitives, but if it does occur then it operates as if they were vertices in complete primitives and such invocations can have side effects.

Vertex shading receives two per-vertex inputs from the primitive assembly stage - the vertexIndex and the instanceIndex. How these values are generated is defined below, with each command.

Drawing commands fall roughly into two categories:

• Non-indexed drawing commands present a sequential vertexIndex to the vertex shader. The sequential index is generated automatically by the device (see Fixed-Function Vertex Processing for details on both specifying the vertex attributes indexed by vertexIndex, as well as binding vertex buffers containing those attributes to a command buffer). These commands are:

• Indexed drawing commands read index values from an index buffer and use this to compute the vertexIndex value for the vertex shader. These commands are:

To bind an index buffer to a command buffer, call:

// Provided by VK_VERSION_1_0
void vkCmdBindIndexBuffer(
VkCommandBuffer                             commandBuffer,
VkBuffer                                    buffer,
VkDeviceSize                                offset,
VkIndexType                                 indexType);
• commandBuffer is the command buffer into which the command is recorded.

• buffer is the buffer being bound.

• offset is the starting offset in bytes within buffer used in index buffer address calculations.

• indexType is a VkIndexType value specifying whether indices are treated as 16 bits or 32 bits.

Valid Usage
• VUID-vkCmdBindIndexBuffer-offset-00431
offset must be less than the size of buffer

• VUID-vkCmdBindIndexBuffer-offset-00432
The sum of offset and the address of the range of VkDeviceMemory object that is backing buffer, must be a multiple of the type indicated by indexType

• VUID-vkCmdBindIndexBuffer-buffer-00433
buffer must have been created with the VK_BUFFER_USAGE_INDEX_BUFFER_BIT flag

• VUID-vkCmdBindIndexBuffer-buffer-00434
If buffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdBindIndexBuffer-indexType-02507
indexType must not be VK_INDEX_TYPE_NONE_KHR

Valid Usage (Implicit)
• VUID-vkCmdBindIndexBuffer-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdBindIndexBuffer-buffer-parameter
buffer must be a valid VkBuffer handle

• VUID-vkCmdBindIndexBuffer-indexType-parameter
indexType must be a valid VkIndexType value

• VUID-vkCmdBindIndexBuffer-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdBindIndexBuffer-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdBindIndexBuffer-commonparent
Both of buffer, and commandBuffer must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Both

Graphics

Possible values of vkCmdBindIndexBuffer::indexType, specifying the size of indices, are:

// Provided by VK_VERSION_1_0
typedef enum VkIndexType {
VK_INDEX_TYPE_UINT16 = 0,
VK_INDEX_TYPE_UINT32 = 1,
// Provided by VK_KHR_acceleration_structure
VK_INDEX_TYPE_NONE_KHR = 1000165000,
} VkIndexType;
• VK_INDEX_TYPE_UINT16 specifies that indices are 16-bit unsigned integer values.

• VK_INDEX_TYPE_UINT32 specifies that indices are 32-bit unsigned integer values.

• VK_INDEX_TYPE_NONE_KHR specifies that no indices are provided.

The parameters for each drawing command are specified directly in the command or read from buffer memory, depending on the command. Drawing commands that source their parameters from buffer memory are known as indirect drawing commands.

All drawing commands interact with the Robust Buffer Access feature.

To record a non-indexed draw, call:

// Provided by VK_VERSION_1_0
void vkCmdDraw(
VkCommandBuffer                             commandBuffer,
uint32_t                                    vertexCount,
uint32_t                                    instanceCount,
uint32_t                                    firstVertex,
uint32_t                                    firstInstance);
• commandBuffer is the command buffer into which the command is recorded.

• vertexCount is the number of vertices to draw.

• instanceCount is the number of instances to draw.

• firstVertex is the index of the first vertex to draw.

• firstInstance is the instance ID of the first instance to draw.

When the command is executed, primitives are assembled using the current primitive topology and vertexCount consecutive vertex indices with the first vertexIndex value equal to firstVertex. The primitives are drawn instanceCount times with instanceIndex starting with firstInstance and increasing sequentially for each instance. The assembled primitives execute the bound graphics pipeline.

Valid Usage
• VUID-vkCmdDraw-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDraw-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDraw-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDraw-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDraw-None-02698
For each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDraw-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDraw-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDraw-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the [VK_NV_inherited_viewport_scissor] extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDraw-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDraw-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDraw-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDraw-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDraw-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDraw-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDraw-commandBuffer-02707
If commandBuffer is an unprotected command buffer, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDraw-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format.

• VUID-vkCmdDraw-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format.

• VUID-vkCmdDraw-renderPass-02684
The current render pass must be compatible with the renderPass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDraw-subpass-02685
The subpass index of the current render pass must be equal to the subpass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDraw-None-02686
Every input attachment used by the current subpass must be bound to the pipeline via a descriptor set

• VUID-vkCmdDraw-None-04584
Image subresources used as attachments in the current render pass must not be accessed in any way other than as an attachment by this command, except for cases involving read-only access to depth/stencil attachments as described in the Render Pass chapter

• VUID-vkCmdDraw-maxMultiviewInstanceIndex-02688
If the draw is recorded in a render pass instance with multiview enabled, the maximum instance index must be less than or equal to VkPhysicalDeviceMultiviewProperties::maxMultiviewInstanceIndex

• VUID-vkCmdDraw-blendEnable-04727
If rasterization is not disabled in the bound graphics pipeline, then for each color attachment in the subpass, if the corresponding image view’s format features do not contain VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT, then the blendEnable member of the corresponding element of the pAttachments member of pColorBlendState must be VK_FALSE

• VUID-vkCmdDraw-rasterizationSamples-04740
If rasterization is not disabled in the bound graphics pipeline, and neither the [VK_AMD_mixed_attachment_samples] nor the [VK_NV_framebuffer_mixed_samples] extensions are enabled, then VkPipelineMultisampleStateCreateInfo::rasterizationSamples must be the same as the current subpass color and/or depth/stencil attachments

• VUID-vkCmdDraw-commandBuffer-02712
If commandBuffer is a protected command buffer, any resource written to by the VkPipeline object bound to the pipeline bind point used by this command must not be an unprotected resource

• VUID-vkCmdDraw-commandBuffer-02713
If commandBuffer is a protected command buffer, pipeline stages other than the framebuffer-space and compute stages in the VkPipeline object bound to the pipeline bind point used by this command must not write to any resource

• VUID-vkCmdDraw-commandBuffer-04617
If any of the shader stages of the VkPipeline bound to the pipeline bind point used by this command uses the RayQueryKHR capability, then commandBuffer must not be a protected command buffer

• VUID-vkCmdDraw-None-04007
All vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must have either valid or VK_NULL_HANDLE buffers bound

• VUID-vkCmdDraw-None-04008
If the nullDescriptor feature is not enabled, all vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must not be VK_NULL_HANDLE

• VUID-vkCmdDraw-None-02721
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

Valid Usage (Implicit)
• VUID-vkCmdDraw-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdDraw-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdDraw-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdDraw-renderpass
This command must only be called inside of a render pass instance

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Inside

Graphics

To record an indexed draw, call:

// Provided by VK_VERSION_1_0
void vkCmdDrawIndexed(
VkCommandBuffer                             commandBuffer,
uint32_t                                    indexCount,
uint32_t                                    instanceCount,
uint32_t                                    firstIndex,
int32_t                                     vertexOffset,
uint32_t                                    firstInstance);
• commandBuffer is the command buffer into which the command is recorded.

• indexCount is the number of vertices to draw.

• instanceCount is the number of instances to draw.

• firstIndex is the base index within the index buffer.

• vertexOffset is the value added to the vertex index before indexing into the vertex buffer.

• firstInstance is the instance ID of the first instance to draw.

When the command is executed, primitives are assembled using the current primitive topology and indexCount vertices whose indices are retrieved from the index buffer. The index buffer is treated as an array of tightly packed unsigned integers of size defined by the vkCmdBindIndexBuffer::indexType parameter with which the buffer was bound.

The first vertex index is at an offset of firstIndex × indexSize + offset within the bound index buffer, where offset is the offset specified by vkCmdBindIndexBuffer and indexSize is the byte size of the type specified by indexType. Subsequent index values are retrieved from consecutive locations in the index buffer. Indices are first compared to the primitive restart value, then zero extended to 32 bits (if the indexType is VK_INDEX_TYPE_UINT16) and have vertexOffset added to them, before being supplied as the vertexIndex value.

The primitives are drawn instanceCount times with instanceIndex starting with firstInstance and increasing sequentially for each instance. The assembled primitives execute the bound graphics pipeline.

Valid Usage
• VUID-vkCmdDrawIndexed-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndexed-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndexed-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDrawIndexed-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndexed-None-02698
For each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndexed-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndexed-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndexed-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the [VK_NV_inherited_viewport_scissor] extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDrawIndexed-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDrawIndexed-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDrawIndexed-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDrawIndexed-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDrawIndexed-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndexed-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndexed-commandBuffer-02707
If commandBuffer is an unprotected command buffer, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDrawIndexed-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format.

• VUID-vkCmdDrawIndexed-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format.

• VUID-vkCmdDrawIndexed-renderPass-02684
The current render pass must be compatible with the renderPass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndexed-subpass-02685
The subpass index of the current render pass must be equal to the subpass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndexed-None-02686
Every input attachment used by the current subpass must be bound to the pipeline via a descriptor set

• VUID-vkCmdDrawIndexed-None-04584
Image subresources used as attachments in the current render pass must not be accessed in any way other than as an attachment by this command, except for cases involving read-only access to depth/stencil attachments as described in the Render Pass chapter

• VUID-vkCmdDrawIndexed-maxMultiviewInstanceIndex-02688
If the draw is recorded in a render pass instance with multiview enabled, the maximum instance index must be less than or equal to VkPhysicalDeviceMultiviewProperties::maxMultiviewInstanceIndex

• VUID-vkCmdDrawIndexed-blendEnable-04727
If rasterization is not disabled in the bound graphics pipeline, then for each color attachment in the subpass, if the corresponding image view’s format features do not contain VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT, then the blendEnable member of the corresponding element of the pAttachments member of pColorBlendState must be VK_FALSE

• VUID-vkCmdDrawIndexed-rasterizationSamples-04740
If rasterization is not disabled in the bound graphics pipeline, and neither the [VK_AMD_mixed_attachment_samples] nor the [VK_NV_framebuffer_mixed_samples] extensions are enabled, then VkPipelineMultisampleStateCreateInfo::rasterizationSamples must be the same as the current subpass color and/or depth/stencil attachments

• VUID-vkCmdDrawIndexed-commandBuffer-02712
If commandBuffer is a protected command buffer, any resource written to by the VkPipeline object bound to the pipeline bind point used by this command must not be an unprotected resource

• VUID-vkCmdDrawIndexed-commandBuffer-02713
If commandBuffer is a protected command buffer, pipeline stages other than the framebuffer-space and compute stages in the VkPipeline object bound to the pipeline bind point used by this command must not write to any resource

• VUID-vkCmdDrawIndexed-commandBuffer-04617
If any of the shader stages of the VkPipeline bound to the pipeline bind point used by this command uses the RayQueryKHR capability, then commandBuffer must not be a protected command buffer

• VUID-vkCmdDrawIndexed-None-04007
All vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must have either valid or VK_NULL_HANDLE buffers bound

• VUID-vkCmdDrawIndexed-None-04008
If the nullDescriptor feature is not enabled, all vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must not be VK_NULL_HANDLE

• VUID-vkCmdDrawIndexed-None-02721
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-vkCmdDrawIndexed-firstIndex-04932
(indexSize × (firstIndex + indexCount) + offset) must be less than or equal to the size of the bound index buffer, with indexSize being based on the type specified by indexType, where the index buffer, indexType, and offset are specified via vkCmdBindIndexBuffer

Valid Usage (Implicit)
• VUID-vkCmdDrawIndexed-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdDrawIndexed-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdDrawIndexed-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdDrawIndexed-renderpass
This command must only be called inside of a render pass instance

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Inside

Graphics

To record a non-indexed indirect drawing command, call:

// Provided by VK_VERSION_1_0
void vkCmdDrawIndirect(
VkCommandBuffer                             commandBuffer,
VkBuffer                                    buffer,
VkDeviceSize                                offset,
uint32_t                                    drawCount,
uint32_t                                    stride);
• commandBuffer is the command buffer into which the command is recorded.

• buffer is the buffer containing draw parameters.

• offset is the byte offset into buffer where parameters begin.

• drawCount is the number of draws to execute, and can be zero.

• stride is the byte stride between successive sets of draw parameters.

vkCmdDrawIndirect behaves similarly to vkCmdDraw except that the parameters are read by the device from a buffer during execution. drawCount draws are executed by the command, with parameters taken from buffer starting at offset and increasing by stride bytes for each successive draw. The parameters of each draw are encoded in an array of VkDrawIndirectCommand structures. If drawCount is less than or equal to one, stride is ignored.

Valid Usage
• VUID-vkCmdDrawIndirect-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndirect-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndirect-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDrawIndirect-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndirect-None-02698
For each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndirect-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndirect-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndirect-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the [VK_NV_inherited_viewport_scissor] extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDrawIndirect-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDrawIndirect-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDrawIndirect-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDrawIndirect-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDrawIndirect-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndirect-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndirect-commandBuffer-02707
If commandBuffer is an unprotected command buffer, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDrawIndirect-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format.

• VUID-vkCmdDrawIndirect-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format.

• VUID-vkCmdDrawIndirect-renderPass-02684
The current render pass must be compatible with the renderPass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndirect-subpass-02685
The subpass index of the current render pass must be equal to the subpass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndirect-None-02686
Every input attachment used by the current subpass must be bound to the pipeline via a descriptor set

• VUID-vkCmdDrawIndirect-None-04584
Image subresources used as attachments in the current render pass must not be accessed in any way other than as an attachment by this command, except for cases involving read-only access to depth/stencil attachments as described in the Render Pass chapter

• VUID-vkCmdDrawIndirect-maxMultiviewInstanceIndex-02688
If the draw is recorded in a render pass instance with multiview enabled, the maximum instance index must be less than or equal to VkPhysicalDeviceMultiviewProperties::maxMultiviewInstanceIndex

• VUID-vkCmdDrawIndirect-blendEnable-04727
If rasterization is not disabled in the bound graphics pipeline, then for each color attachment in the subpass, if the corresponding image view’s format features do not contain VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT, then the blendEnable member of the corresponding element of the pAttachments member of pColorBlendState must be VK_FALSE

• VUID-vkCmdDrawIndirect-rasterizationSamples-04740
If rasterization is not disabled in the bound graphics pipeline, and neither the [VK_AMD_mixed_attachment_samples] nor the [VK_NV_framebuffer_mixed_samples] extensions are enabled, then VkPipelineMultisampleStateCreateInfo::rasterizationSamples must be the same as the current subpass color and/or depth/stencil attachments

• VUID-vkCmdDrawIndirect-None-04007
All vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must have either valid or VK_NULL_HANDLE buffers bound

• VUID-vkCmdDrawIndirect-None-04008
If the nullDescriptor feature is not enabled, all vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must not be VK_NULL_HANDLE

• VUID-vkCmdDrawIndirect-None-02721
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-vkCmdDrawIndirect-buffer-02708
If buffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdDrawIndirect-buffer-02709
buffer must have been created with the VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set

• VUID-vkCmdDrawIndirect-offset-02710
offset must be a multiple of 4

• VUID-vkCmdDrawIndirect-commandBuffer-02711
commandBuffer must not be a protected command buffer

• VUID-vkCmdDrawIndirect-drawCount-02718
If the multi-draw indirect feature is not enabled, drawCount must be 0 or 1

• VUID-vkCmdDrawIndirect-drawCount-02719
drawCount must be less than or equal to VkPhysicalDeviceLimits::maxDrawIndirectCount

• VUID-vkCmdDrawIndirect-firstInstance-00478
If the drawIndirectFirstInstance feature is not enabled, all the firstInstance members of the VkDrawIndirectCommand structures accessed by this command must be 0

• VUID-vkCmdDrawIndirect-drawCount-00476
If drawCount is greater than 1, stride must be a multiple of 4 and must be greater than or equal to sizeof(VkDrawIndirectCommand)

• VUID-vkCmdDrawIndirect-drawCount-00487
If drawCount is equal to 1, (offset + sizeof(VkDrawIndirectCommand)) must be less than or equal to the size of buffer

• VUID-vkCmdDrawIndirect-drawCount-00488
If drawCount is greater than 1, (stride × (drawCount - 1) + offset + sizeof(VkDrawIndirectCommand)) must be less than or equal to the size of buffer

Valid Usage (Implicit)
• VUID-vkCmdDrawIndirect-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdDrawIndirect-buffer-parameter
buffer must be a valid VkBuffer handle

• VUID-vkCmdDrawIndirect-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdDrawIndirect-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdDrawIndirect-renderpass
This command must only be called inside of a render pass instance

• VUID-vkCmdDrawIndirect-commonparent
Both of buffer, and commandBuffer must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Inside

Graphics

The VkDrawIndirectCommand structure is defined as:

// Provided by VK_VERSION_1_0
typedef struct VkDrawIndirectCommand {
uint32_t    vertexCount;
uint32_t    instanceCount;
uint32_t    firstVertex;
uint32_t    firstInstance;
} VkDrawIndirectCommand;
• vertexCount is the number of vertices to draw.

• instanceCount is the number of instances to draw.

• firstVertex is the index of the first vertex to draw.

• firstInstance is the instance ID of the first instance to draw.

The members of VkDrawIndirectCommand have the same meaning as the similarly named parameters of vkCmdDraw.

Valid Usage
• VUID-VkDrawIndirectCommand-None-00500
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-VkDrawIndirectCommand-firstInstance-00501
If the drawIndirectFirstInstance feature is not enabled, firstInstance must be 0

To record a non-indexed draw call with a draw call count sourced from a buffer, call:

// Provided by VK_KHR_draw_indirect_count
void vkCmdDrawIndirectCountKHR(
VkCommandBuffer                             commandBuffer,
VkBuffer                                    buffer,
VkDeviceSize                                offset,
VkBuffer                                    countBuffer,
VkDeviceSize                                countBufferOffset,
uint32_t                                    maxDrawCount,
uint32_t                                    stride);
• commandBuffer is the command buffer into which the command is recorded.

• buffer is the buffer containing draw parameters.

• offset is the byte offset into buffer where parameters begin.

• countBuffer is the buffer containing the draw count.

• countBufferOffset is the byte offset into countBuffer where the draw count begins.

• maxDrawCount specifies the maximum number of draws that will be executed. The actual number of executed draw calls is the minimum of the count specified in countBuffer and maxDrawCount.

• stride is the byte stride between successive sets of draw parameters.

vkCmdDrawIndirectCount behaves similarly to vkCmdDrawIndirect except that the draw count is read by the device from a buffer during execution. The command will read an unsigned 32-bit integer from countBuffer located at countBufferOffset and use this as the draw count.

Valid Usage
• VUID-vkCmdDrawIndirectCount-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndirectCount-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndirectCount-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDrawIndirectCount-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndirectCount-None-02698
For each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndirectCount-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndirectCount-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndirectCount-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the [VK_NV_inherited_viewport_scissor] extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDrawIndirectCount-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDrawIndirectCount-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDrawIndirectCount-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDrawIndirectCount-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDrawIndirectCount-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndirectCount-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndirectCount-commandBuffer-02707
If commandBuffer is an unprotected command buffer, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDrawIndirectCount-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format.

• VUID-vkCmdDrawIndirectCount-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format.

• VUID-vkCmdDrawIndirectCount-renderPass-02684
The current render pass must be compatible with the renderPass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndirectCount-subpass-02685
The subpass index of the current render pass must be equal to the subpass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndirectCount-None-02686
Every input attachment used by the current subpass must be bound to the pipeline via a descriptor set

• VUID-vkCmdDrawIndirectCount-None-04584
Image subresources used as attachments in the current render pass must not be accessed in any way other than as an attachment by this command, except for cases involving read-only access to depth/stencil attachments as described in the Render Pass chapter

• VUID-vkCmdDrawIndirectCount-maxMultiviewInstanceIndex-02688
If the draw is recorded in a render pass instance with multiview enabled, the maximum instance index must be less than or equal to VkPhysicalDeviceMultiviewProperties::maxMultiviewInstanceIndex

• VUID-vkCmdDrawIndirectCount-blendEnable-04727
If rasterization is not disabled in the bound graphics pipeline, then for each color attachment in the subpass, if the corresponding image view’s format features do not contain VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT, then the blendEnable member of the corresponding element of the pAttachments member of pColorBlendState must be VK_FALSE

• VUID-vkCmdDrawIndirectCount-rasterizationSamples-04740
If rasterization is not disabled in the bound graphics pipeline, and neither the [VK_AMD_mixed_attachment_samples] nor the [VK_NV_framebuffer_mixed_samples] extensions are enabled, then VkPipelineMultisampleStateCreateInfo::rasterizationSamples must be the same as the current subpass color and/or depth/stencil attachments

• VUID-vkCmdDrawIndirectCount-None-04007
All vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must have either valid or VK_NULL_HANDLE buffers bound

• VUID-vkCmdDrawIndirectCount-None-04008
If the nullDescriptor feature is not enabled, all vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must not be VK_NULL_HANDLE

• VUID-vkCmdDrawIndirectCount-None-02721
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-vkCmdDrawIndirectCount-buffer-02708
If buffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdDrawIndirectCount-buffer-02709
buffer must have been created with the VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set

• VUID-vkCmdDrawIndirectCount-offset-02710
offset must be a multiple of 4

• VUID-vkCmdDrawIndirectCount-commandBuffer-02711
commandBuffer must not be a protected command buffer

• VUID-vkCmdDrawIndirectCount-countBuffer-02714
If countBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdDrawIndirectCount-countBuffer-02715
countBuffer must have been created with the VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set

• VUID-vkCmdDrawIndirectCount-countBufferOffset-02716
countBufferOffset must be a multiple of 4

• VUID-vkCmdDrawIndirectCount-countBuffer-02717
The count stored in countBuffer must be less than or equal to VkPhysicalDeviceLimits::maxDrawIndirectCount

• VUID-vkCmdDrawIndirectCount-countBufferOffset-04129
(countBufferOffset + sizeof(uint32_t)) must be less than or equal to the size of countBuffer

• VUID-vkCmdDrawIndirectCount-stride-03110
stride must be a multiple of 4 and must be greater than or equal to sizeof(VkDrawIndirectCommand)

• VUID-vkCmdDrawIndirectCount-maxDrawCount-03111
If maxDrawCount is greater than or equal to 1, (stride × (maxDrawCount - 1) + offset + sizeof(VkDrawIndirectCommand)) must be less than or equal to the size of buffer

• VUID-vkCmdDrawIndirectCount-countBuffer-03121
If the count stored in countBuffer is equal to 1, (offset + sizeof(VkDrawIndirectCommand)) must be less than or equal to the size of buffer

• VUID-vkCmdDrawIndirectCount-countBuffer-03122
If the count stored in countBuffer is greater than 1, (stride × (drawCount - 1) + offset + sizeof(VkDrawIndirectCommand)) must be less than or equal to the size of buffer

Valid Usage (Implicit)
• VUID-vkCmdDrawIndirectCount-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdDrawIndirectCount-buffer-parameter
buffer must be a valid VkBuffer handle

• VUID-vkCmdDrawIndirectCount-countBuffer-parameter
countBuffer must be a valid VkBuffer handle

• VUID-vkCmdDrawIndirectCount-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdDrawIndirectCount-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdDrawIndirectCount-renderpass
This command must only be called inside of a render pass instance

• VUID-vkCmdDrawIndirectCount-commonparent
Each of buffer, commandBuffer, and countBuffer must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Inside

Graphics

To record an indexed indirect drawing command, call:

// Provided by VK_VERSION_1_0
void vkCmdDrawIndexedIndirect(
VkCommandBuffer                             commandBuffer,
VkBuffer                                    buffer,
VkDeviceSize                                offset,
uint32_t                                    drawCount,
uint32_t                                    stride);
• commandBuffer is the command buffer into which the command is recorded.

• buffer is the buffer containing draw parameters.

• offset is the byte offset into buffer where parameters begin.

• drawCount is the number of draws to execute, and can be zero.

• stride is the byte stride between successive sets of draw parameters.

vkCmdDrawIndexedIndirect behaves similarly to vkCmdDrawIndexed except that the parameters are read by the device from a buffer during execution. drawCount draws are executed by the command, with parameters taken from buffer starting at offset and increasing by stride bytes for each successive draw. The parameters of each draw are encoded in an array of VkDrawIndexedIndirectCommand structures. If drawCount is less than or equal to one, stride is ignored.

Valid Usage
• VUID-vkCmdDrawIndexedIndirect-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndexedIndirect-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndexedIndirect-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDrawIndexedIndirect-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndexedIndirect-None-02698
For each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndexedIndirect-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndexedIndirect-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndexedIndirect-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the [VK_NV_inherited_viewport_scissor] extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDrawIndexedIndirect-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDrawIndexedIndirect-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDrawIndexedIndirect-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDrawIndexedIndirect-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDrawIndexedIndirect-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndexedIndirect-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndexedIndirect-commandBuffer-02707
If commandBuffer is an unprotected command buffer, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDrawIndexedIndirect-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format.

• VUID-vkCmdDrawIndexedIndirect-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format.

• VUID-vkCmdDrawIndexedIndirect-renderPass-02684
The current render pass must be compatible with the renderPass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndexedIndirect-subpass-02685
The subpass index of the current render pass must be equal to the subpass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndexedIndirect-None-02686
Every input attachment used by the current subpass must be bound to the pipeline via a descriptor set

• VUID-vkCmdDrawIndexedIndirect-None-04584
Image subresources used as attachments in the current render pass must not be accessed in any way other than as an attachment by this command, except for cases involving read-only access to depth/stencil attachments as described in the Render Pass chapter

• VUID-vkCmdDrawIndexedIndirect-maxMultiviewInstanceIndex-02688
If the draw is recorded in a render pass instance with multiview enabled, the maximum instance index must be less than or equal to VkPhysicalDeviceMultiviewProperties::maxMultiviewInstanceIndex

• VUID-vkCmdDrawIndexedIndirect-blendEnable-04727
If rasterization is not disabled in the bound graphics pipeline, then for each color attachment in the subpass, if the corresponding image view’s format features do not contain VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT, then the blendEnable member of the corresponding element of the pAttachments member of pColorBlendState must be VK_FALSE

• VUID-vkCmdDrawIndexedIndirect-rasterizationSamples-04740
If rasterization is not disabled in the bound graphics pipeline, and neither the [VK_AMD_mixed_attachment_samples] nor the [VK_NV_framebuffer_mixed_samples] extensions are enabled, then VkPipelineMultisampleStateCreateInfo::rasterizationSamples must be the same as the current subpass color and/or depth/stencil attachments

• VUID-vkCmdDrawIndexedIndirect-None-04007
All vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must have either valid or VK_NULL_HANDLE buffers bound

• VUID-vkCmdDrawIndexedIndirect-None-04008
If the nullDescriptor feature is not enabled, all vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must not be VK_NULL_HANDLE

• VUID-vkCmdDrawIndexedIndirect-None-02721
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-vkCmdDrawIndexedIndirect-buffer-02708
If buffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdDrawIndexedIndirect-buffer-02709
buffer must have been created with the VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set

• VUID-vkCmdDrawIndexedIndirect-offset-02710
offset must be a multiple of 4

• VUID-vkCmdDrawIndexedIndirect-commandBuffer-02711
commandBuffer must not be a protected command buffer

• VUID-vkCmdDrawIndexedIndirect-drawCount-02718
If the multi-draw indirect feature is not enabled, drawCount must be 0 or 1

• VUID-vkCmdDrawIndexedIndirect-drawCount-02719
drawCount must be less than or equal to VkPhysicalDeviceLimits::maxDrawIndirectCount

• VUID-vkCmdDrawIndexedIndirect-drawCount-00528
If drawCount is greater than 1, stride must be a multiple of 4 and must be greater than or equal to sizeof(VkDrawIndexedIndirectCommand)

• VUID-vkCmdDrawIndexedIndirect-firstInstance-00530
If the drawIndirectFirstInstance feature is not enabled, all the firstInstance members of the VkDrawIndexedIndirectCommand structures accessed by this command must be 0

• VUID-vkCmdDrawIndexedIndirect-drawCount-00539
If drawCount is equal to 1, (offset + sizeof(VkDrawIndexedIndirectCommand)) must be less than or equal to the size of buffer

• VUID-vkCmdDrawIndexedIndirect-drawCount-00540
If drawCount is greater than 1, (stride × (drawCount - 1) + offset + sizeof(VkDrawIndexedIndirectCommand)) must be less than or equal to the size of buffer

Valid Usage (Implicit)
• VUID-vkCmdDrawIndexedIndirect-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdDrawIndexedIndirect-buffer-parameter
buffer must be a valid VkBuffer handle

• VUID-vkCmdDrawIndexedIndirect-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdDrawIndexedIndirect-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdDrawIndexedIndirect-renderpass
This command must only be called inside of a render pass instance

• VUID-vkCmdDrawIndexedIndirect-commonparent
Both of buffer, and commandBuffer must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Inside

Graphics

The VkDrawIndexedIndirectCommand structure is defined as:

// Provided by VK_VERSION_1_0
typedef struct VkDrawIndexedIndirectCommand {
uint32_t    indexCount;
uint32_t    instanceCount;
uint32_t    firstIndex;
int32_t     vertexOffset;
uint32_t    firstInstance;
} VkDrawIndexedIndirectCommand;
• indexCount is the number of vertices to draw.

• instanceCount is the number of instances to draw.

• firstIndex is the base index within the index buffer.

• vertexOffset is the value added to the vertex index before indexing into the vertex buffer.

• firstInstance is the instance ID of the first instance to draw.

The members of VkDrawIndexedIndirectCommand have the same meaning as the similarly named parameters of vkCmdDrawIndexed.

Valid Usage
• VUID-VkDrawIndexedIndirectCommand-None-00552
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-VkDrawIndexedIndirectCommand-indexSize-00553
(indexSize × (firstIndex + indexCount) + offset) must be less than or equal to the size of the bound index buffer, with indexSize being based on the type specified by indexType, where the index buffer, indexType, and offset are specified via vkCmdBindIndexBuffer

• VUID-VkDrawIndexedIndirectCommand-firstInstance-00554
If the drawIndirectFirstInstance feature is not enabled, firstInstance must be 0

To record an indexed draw call with a draw call count sourced from a buffer, call:

// Provided by VK_KHR_draw_indirect_count
void vkCmdDrawIndexedIndirectCountKHR(
VkCommandBuffer                             commandBuffer,
VkBuffer                                    buffer,
VkDeviceSize                                offset,
VkBuffer                                    countBuffer,
VkDeviceSize                                countBufferOffset,
uint32_t                                    maxDrawCount,
uint32_t                                    stride);
• commandBuffer is the command buffer into which the command is recorded.

• buffer is the buffer containing draw parameters.

• offset is the byte offset into buffer where parameters begin.

• countBuffer is the buffer containing the draw count.

• countBufferOffset is the byte offset into countBuffer where the draw count begins.

• maxDrawCount specifies the maximum number of draws that will be executed. The actual number of executed draw calls is the minimum of the count specified in countBuffer and maxDrawCount.

• stride is the byte stride between successive sets of draw parameters.

vkCmdDrawIndexedIndirectCount behaves similarly to vkCmdDrawIndexedIndirect except that the draw count is read by the device from a buffer during execution. The command will read an unsigned 32-bit integer from countBuffer located at countBufferOffset and use this as the draw count.

Valid Usage
• VUID-vkCmdDrawIndexedIndirectCount-magFilter-04553
If a VkSampler created with magFilter or minFilter equal to VK_FILTER_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndexedIndirectCount-mipmapMode-04770
If a VkSampler created with mipmapMode equal to VK_SAMPLER_MIPMAP_MODE_LINEAR and compareEnable equal to VK_FALSE is used to sample a VkImageView as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT

• VUID-vkCmdDrawIndexedIndirectCount-None-02691
If a VkImageView is accessed using atomic operations as a result of this command, then the image view’s format features must contain VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT

• VUID-vkCmdDrawIndexedIndirectCount-None-02697
For each set n that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a descriptor set must have been bound to n at the same pipeline bind point, with a VkPipelineLayout that is compatible for set n, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndexedIndirectCount-None-02698
For each push constant that is statically used by the VkPipeline bound to the pipeline bind point used by this command, a push constant value must have been set for the same pipeline bind point, with a VkPipelineLayout that is compatible for push constants, with the VkPipelineLayout used to create the current VkPipeline, as described in Pipeline Layout Compatibility

• VUID-vkCmdDrawIndexedIndirectCount-None-02699
Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndexedIndirectCount-None-02700
A valid pipeline must be bound to the pipeline bind point used by this command

• VUID-vkCmdDrawIndexedIndirectCount-commandBuffer-02701
If the VkPipeline object bound to the pipeline bind point used by this command requires any dynamic state, that state must have been set or inherited (if the [VK_NV_inherited_viewport_scissor] extension is enabled) for commandBuffer, and done so after any previously bound pipeline with the corresponding state not specified as dynamic

• VUID-vkCmdDrawIndexedIndirectCount-None-02859
There must not have been any calls to dynamic state setting commands for any state not specified as dynamic in the VkPipeline object bound to the pipeline bind point used by this command, since that pipeline was bound

• VUID-vkCmdDrawIndexedIndirectCount-None-02702
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used to sample from any VkImage with a VkImageView of the type VK_IMAGE_VIEW_TYPE_3D, VK_IMAGE_VIEW_TYPE_CUBE, VK_IMAGE_VIEW_TYPE_1D_ARRAY, VK_IMAGE_VIEW_TYPE_2D_ARRAY or VK_IMAGE_VIEW_TYPE_CUBE_ARRAY, in any shader stage

• VUID-vkCmdDrawIndexedIndirectCount-None-02703
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions with ImplicitLod, Dref or Proj in their name, in any shader stage

• VUID-vkCmdDrawIndexedIndirectCount-None-02704
If the VkPipeline object bound to the pipeline bind point used by this command accesses a VkSampler object that uses unnormalized coordinates, that sampler must not be used with any of the SPIR-V OpImageSample* or OpImageSparseSample* instructions that includes a LOD bias or any offset values, in any shader stage

• VUID-vkCmdDrawIndexedIndirectCount-None-02705
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a uniform buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndexedIndirectCount-None-02706
If the robust buffer access feature is not enabled, and if the VkPipeline object bound to the pipeline bind point used by this command accesses a storage buffer, it must not access values outside of the range of the buffer as specified in the descriptor set bound to the same pipeline bind point

• VUID-vkCmdDrawIndexedIndirectCount-commandBuffer-02707
If commandBuffer is an unprotected command buffer, any resource accessed by the VkPipeline object bound to the pipeline bind point used by this command must not be a protected resource

• VUID-vkCmdDrawIndexedIndirectCount-None-04115
If a VkImageView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the image view’s format.

• VUID-vkCmdDrawIndexedIndirectCount-OpImageWrite-04469
If a VkBufferView is accessed using OpImageWrite as a result of this command, then the Type of the Texel operand of that instruction must have at least as many components as the buffer view’s format.

• VUID-vkCmdDrawIndexedIndirectCount-renderPass-02684
The current render pass must be compatible with the renderPass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndexedIndirectCount-subpass-02685
The subpass index of the current render pass must be equal to the subpass member of the VkGraphicsPipelineCreateInfo structure specified when creating the VkPipeline bound to VK_PIPELINE_BIND_POINT_GRAPHICS

• VUID-vkCmdDrawIndexedIndirectCount-None-02686
Every input attachment used by the current subpass must be bound to the pipeline via a descriptor set

• VUID-vkCmdDrawIndexedIndirectCount-None-04584
Image subresources used as attachments in the current render pass must not be accessed in any way other than as an attachment by this command, except for cases involving read-only access to depth/stencil attachments as described in the Render Pass chapter

• VUID-vkCmdDrawIndexedIndirectCount-maxMultiviewInstanceIndex-02688
If the draw is recorded in a render pass instance with multiview enabled, the maximum instance index must be less than or equal to VkPhysicalDeviceMultiviewProperties::maxMultiviewInstanceIndex

• VUID-vkCmdDrawIndexedIndirectCount-blendEnable-04727
If rasterization is not disabled in the bound graphics pipeline, then for each color attachment in the subpass, if the corresponding image view’s format features do not contain VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT, then the blendEnable member of the corresponding element of the pAttachments member of pColorBlendState must be VK_FALSE

• VUID-vkCmdDrawIndexedIndirectCount-rasterizationSamples-04740
If rasterization is not disabled in the bound graphics pipeline, and neither the [VK_AMD_mixed_attachment_samples] nor the [VK_NV_framebuffer_mixed_samples] extensions are enabled, then VkPipelineMultisampleStateCreateInfo::rasterizationSamples must be the same as the current subpass color and/or depth/stencil attachments

• VUID-vkCmdDrawIndexedIndirectCount-None-04007
All vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must have either valid or VK_NULL_HANDLE buffers bound

• VUID-vkCmdDrawIndexedIndirectCount-None-04008
If the nullDescriptor feature is not enabled, all vertex input bindings accessed via vertex input variables declared in the vertex shader entry point’s interface must not be VK_NULL_HANDLE

• VUID-vkCmdDrawIndexedIndirectCount-None-02721
For a given vertex buffer binding, any attribute data fetched must be entirely contained within the corresponding vertex buffer binding, as described in Vertex Input Description

• VUID-vkCmdDrawIndexedIndirectCount-buffer-02708
If buffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdDrawIndexedIndirectCount-buffer-02709
buffer must have been created with the VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set

• VUID-vkCmdDrawIndexedIndirectCount-offset-02710
offset must be a multiple of 4

• VUID-vkCmdDrawIndexedIndirectCount-commandBuffer-02711
commandBuffer must not be a protected command buffer

• VUID-vkCmdDrawIndexedIndirectCount-countBuffer-02714
If countBuffer is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

• VUID-vkCmdDrawIndexedIndirectCount-countBuffer-02715
countBuffer must have been created with the VK_BUFFER_USAGE_INDIRECT_BUFFER_BIT bit set

• VUID-vkCmdDrawIndexedIndirectCount-countBufferOffset-02716
countBufferOffset must be a multiple of 4

• VUID-vkCmdDrawIndexedIndirectCount-countBuffer-02717
The count stored in countBuffer must be less than or equal to VkPhysicalDeviceLimits::maxDrawIndirectCount

• VUID-vkCmdDrawIndexedIndirectCount-countBufferOffset-04129
(countBufferOffset + sizeof(uint32_t)) must be less than or equal to the size of countBuffer

• VUID-vkCmdDrawIndexedIndirectCount-stride-03142
stride must be a multiple of 4 and must be greater than or equal to sizeof(VkDrawIndexedIndirectCommand)

• VUID-vkCmdDrawIndexedIndirectCount-maxDrawCount-03143
If maxDrawCount is greater than or equal to 1, (stride × (maxDrawCount - 1) + offset + sizeof(VkDrawIndexedIndirectCommand)) must be less than or equal to the size of buffer

• VUID-vkCmdDrawIndexedIndirectCount-countBuffer-03153
If count stored in countBuffer is equal to 1, (offset + sizeof(VkDrawIndexedIndirectCommand)) must be less than or equal to the size of buffer

• VUID-vkCmdDrawIndexedIndirectCount-countBuffer-03154
If count stored in countBuffer is greater than 1, (stride × (drawCount - 1) + offset + sizeof(VkDrawIndexedIndirectCommand)) must be less than or equal to the size of buffer

Valid Usage (Implicit)
• VUID-vkCmdDrawIndexedIndirectCount-commandBuffer-parameter
commandBuffer must be a valid VkCommandBuffer handle

• VUID-vkCmdDrawIndexedIndirectCount-buffer-parameter
buffer must be a valid VkBuffer handle

• VUID-vkCmdDrawIndexedIndirectCount-countBuffer-parameter
countBuffer must be a valid VkBuffer handle

• VUID-vkCmdDrawIndexedIndirectCount-commandBuffer-recording
commandBuffer must be in the recording state

• VUID-vkCmdDrawIndexedIndirectCount-commandBuffer-cmdpool
The VkCommandPool that commandBuffer was allocated from must support graphics operations

• VUID-vkCmdDrawIndexedIndirectCount-renderpass
This command must only be called inside of a render pass instance

• VUID-vkCmdDrawIndexedIndirectCount-commonparent
Each of buffer, commandBuffer, and countBuffer must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization
• Host access to commandBuffer must be externally synchronized

• Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types

Primary
Secondary

Inside

Graphics