C Specification

The VkPhysicalDeviceShaderCorePropertiesAMD structure is defined as:

typedef struct VkPhysicalDeviceShaderCorePropertiesAMD {
    VkStructureType    sType;
    void*              pNext;
    uint32_t           shaderEngineCount;
    uint32_t           shaderArraysPerEngineCount;
    uint32_t           computeUnitsPerShaderArray;
    uint32_t           simdPerComputeUnit;
    uint32_t           wavefrontsPerSimd;
    uint32_t           wavefrontSize;
    uint32_t           sgprsPerSimd;
    uint32_t           minSgprAllocation;
    uint32_t           maxSgprAllocation;
    uint32_t           sgprAllocationGranularity;
    uint32_t           vgprsPerSimd;
    uint32_t           minVgprAllocation;
    uint32_t           maxVgprAllocation;
    uint32_t           vgprAllocationGranularity;
} VkPhysicalDeviceShaderCorePropertiesAMD;

Members

The members of the VkPhysicalDeviceShaderCorePropertiesAMD structure describe the following implementation-dependent limits:

Description

  • sType is the type of this structure.

  • pNext is NULL or a pointer to an extension-specific structure.

  • shaderEngineCount is an unsigned integer value indicating the number of shader engines found inside the shader core of the physical device.

  • shaderArraysPerEngineCount is an unsigned integer value indicating the number of shader arrays inside a shader engine. Each shader array has its own scan converter, set of compute units, and a render back end (color and depth buffers). Shader arrays within a shader engine share shader processor input (wave launcher) and shader export (export buffer) units. Currently, a shader engine can have one or two shader arrays.

  • computeUnitsPerShaderArray is an unsigned integer value indicating the physical number of compute units within a shader array. The active number of compute units in a shader array may be lower. A compute unit houses a set of SIMDs along with a sequencer module and a local data store.

  • simdPerComputeUnit is an unsigned integer value indicating the number of SIMDs inside a compute unit. Each SIMD processes a single instruction at a time.

  • wavefrontSize is an unsigned integer value indicating the maximum size of a subgroup.

  • sgprsPerSimd is an unsigned integer value indicating the number of physical Scalar General Purpose Registers (SGPRs) per SIMD.

  • minSgprAllocation is an unsigned integer value indicating the minimum number of SGPRs allocated for a wave.

  • maxSgprAllocation is an unsigned integer value indicating the maximum number of SGPRs allocated for a wave.

  • sgprAllocationGranularity is an unsigned integer value indicating the granularity of SGPR allocation for a wave.

  • vgprsPerSimd is an unsigned integer value indicating the number of physical Vector General Purpose Registers (VGPRs) per SIMD.

  • minVgprAllocation is an unsigned integer value indicating the minimum number of VGPRs allocated for a wave.

  • maxVgprAllocation is an unsigned integer value indicating the maximum number of VGPRs allocated for a wave.

  • vgprAllocationGranularity is an unsigned integer value indicating the granularity of VGPR allocation for a wave.

If the VkPhysicalDeviceShaderCorePropertiesAMD structure is included in the pNext chain of VkPhysicalDeviceProperties2, it is filled with the implementation-dependent limits.

Valid Usage (Implicit)
  • sType must be VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CORE_PROPERTIES_AMD

See Also

Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.