VulkanHub
Structures

VkDrawIndexedIndirectCommand

Structure specifying an indexed indirect drawing command

The VkDrawIndexedIndirectCommand structure is defined as:

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-pNext-09461

If the bound graphics pipeline state was created with VkPipelineVertexInputDivisorStateCreateInfoKHR in the pNext chain of VkGraphicsPipelineCreateInfo::pVertexInputState, any member of VkPipelineVertexInputDivisorStateCreateInfoKHR::pVertexBindingDivisors has a value other than 1 in divisor, and VkPhysicalDeviceVertexAttributeDivisorPropertiesKHR::supportsNonZeroFirstInstance is VK_FALSE, then firstInstance must be 0

VUID-VkDrawIndexedIndirectCommand-None-09462

If shader objects are used for drawing or the bound graphics pipeline state was created with the VK_DYNAMIC_STATE_VERTEX_INPUT_EXT dynamic state enabled, any member of the pVertexBindingDescriptions parameter to the vkCmdSetVertexInputEXT call that sets this dynamic state has a value other than 1 in divisor, and VkPhysicalDeviceVertexAttributeDivisorPropertiesKHR::supportsNonZeroFirstInstance is VK_FALSE, then firstInstance must be 0

VUID-VkDrawIndexedIndirectCommand-robustBufferAccess2-08798

If robustBufferAccess2 is not enabled, (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 or vkCmdBindIndexBuffer2KHR. If vkCmdBindIndexBuffer2KHR is used to bind the index buffer, the size of the bound index buffer is vkCmdBindIndexBuffer2KHR::size

VUID-VkDrawIndexedIndirectCommand-firstInstance-00554

If the drawIndirectFirstInstance feature is not enabled, firstInstance must be 0