# VkPhysicalDeviceShaderCorePropertiesAMD(3) Manual Page

## Name

VkPhysicalDeviceShaderCorePropertiesAMD - Structure describing shader core properties that can be supported by an implementation

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## C Specification

The `VkPhysicalDeviceShaderCorePropertiesAMD` structure is defined as:

    // Provided by VK_AMD_shader_core_properties
    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

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this 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 attachments). 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.

## Description

If the `VkPhysicalDeviceShaderCorePropertiesAMD` structure is included in the `pNext` chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

Valid Usage (Implicit)

- VUID-VkPhysicalDeviceShaderCorePropertiesAMD-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CORE_PROPERTIES_AMD`

## See Also

VK_AMD_shader_core_properties, VkStructureType

## 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

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0