Vulkan-Docs/appendices/VK_AMD_shader_core_properties.txt
Jon Leech dd9919749a Change log for August 13, 2018 Vulkan 1.1.83 spec update:
* Update release number to 83.

Public Issues:

  * Use [%inline] directive for all SVGs to reduce file size (public pull
    request 734).
  * Convert XML `value` aliases into \<alias> tags (public pull request
    747).
  * Fix metadoc script showing non-selected extensions (public pull request
    748).
  * Reapply public pull request 742 to make
    ename:VK_PIPELINE_STAGE_CONDITIONAL_RENDERING_BIT_EXT part of the
    graphices pipeline (public pull request 749).
  * Fix numerous typos related to accidental duplication of words (public
    pull request 760).
  * Fix `vk.xml` contact typos (public pull request 761).

Internal Issues:

  * Add images to the <<Standard sample locations>> table (internal issue
    1115).
  * Add a definition of "`Inherited from`" precision in the
    <<spirvenv-precision-operation, Precision and Operation of SPIR-V
    Instructions>> section (internal issue 1314).
  * Clarify that both built-in and user-defined variables count against the
    location limits for shader interfaces in the
    <<interfaces-iointerfaces-locations, Location Assignment>> section
    (internal issue 1316).
  * Merge "`required`" capabilities into the <<spirvenv-capabilities-table,
    list of optional: SPIR-V capabilities>> (internal issue 1320).
  * Relax the layout matching rules of descriptors referring to only a
    single aspect of a depth/stencil image, by reference to the new
    <<resources-image-layouts-matching-rule, Image Layout Matching Rules>>
    section (internal issue 1346).
  * Revert extension metadoc generator warning about name mismatches to a
    diagnostic, due to annoying warnings in build output for conscious
    choices we've made (internal issue 1351).

Other Issues:

  * Reserve bits for pending vendor extensions.
  * Make Vulkan consistent with SPIR-V regarding code:DepthReplacing and
    code:FragDepth in the <<interfaces-builtin-variables, Built-In
    Variables>> section.
  * Add missing ChangeLog entries for the previous three spec updates.
2018-08-13 06:23:03 -07:00

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include::meta/VK_AMD_shader_core_properties.txt[]
*Last Modified Date*::
2018-02-15
*IP Status*::
No known IP claims.
*Contributors*::
- Martin Dinkov, AMD
- Matthaeus Chajdas, AMD
This extension exposes shader core properties for a target physical device
through the VK_KHR_get_physical_device_properties2 extension.
Please refer to the example below for proper usage.
=== New Object Types
None.
=== New Enum Constants
* Extending ename:VkStructureType:
** ename:VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CORE_PROPERTIES_AMD
=== New Enums
None.
=== New Structures
* slink:VkPhysicalDeviceShaderCorePropertiesAMD
=== New Functions
None.
=== Examples
This example retrieves the shader core properties for a physical device.
[source,c++]
----------------------------------------
extern VkInstance instance;
PFN_vkGetPhysicalDeviceProperties2 pfnVkGetPhysicalDeviceProperties2 =
reinterpret_cast<PFN_vkGetPhysicalDeviceProperties2>
(vkGetInstanceProcAddr(instance, "vkGetPhysicalDeviceProperties2") );
VkPhysicalDeviceProperties2 general_props;
VkPhysicalDeviceShaderCorePropertiesAMD shader_core_properties;
shader_core_properties.pNext = nullptr;
shader_core_properties.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CORE_PROPERTIES_AMD;
general_props.pNext = &shader_core_properties;
general_props.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2;
// After this call, shader_core_properties has been populated
pfnVkGetPhysicalDeviceProperties2(device, &general_props);
printf("Number of shader engines: %d\n",
m_shader_core_properties.shader_engine_count =
shader_core_properties.shaderEngineCount;
printf("Number of shader arrays: %d\n",
m_shader_core_properties.shader_arrays_per_engine_count =
shader_core_properties.shaderArraysPerEngineCount;
printf("Number of CUs per shader array: %d\n",
m_shader_core_properties.compute_units_per_shader_array =
shader_core_properties.computeUnitsPerShaderArray;
printf("Number of SIMDs per compute unit: %d\n",
m_shader_core_properties.simd_per_compute_unit =
shader_core_properties.simdPerComputeUnit;
printf("Number of wavefront slots in each SIMD: %d\n",
m_shader_core_properties.wavefronts_per_simd =
shader_core_properties.wavefrontsPerSimd;
printf("Number of threads per wavefront: %d\n",
m_shader_core_properties.wavefront_size =
shader_core_properties.wavefrontSize;
printf("Number of physical SGPRs per SIMD: %d\n",
m_shader_core_properties.sgprs_per_simd =
shader_core_properties.sgprsPerSimd;
printf("Minimum number of SGPRs that can be allocated by a wave: %d\n",
m_shader_core_properties.min_sgpr_allocation =
shader_core_properties.minSgprAllocation;
printf("Number of available SGPRs: %d\n",
m_shader_core_properties.max_sgpr_allocation =
shader_core_properties.maxSgprAllocation;
printf("SGPRs are allocated in groups of this size: %d\n",
m_shader_core_properties.sgpr_allocation_granularity =
shader_core_properties.sgprAllocationGranularity;
printf("Number of physical VGPRs per SIMD: %d\n",
m_shader_core_properties.vgprs_per_simd =
shader_core_properties.vgprsPerSimd;
printf("Minimum number of VGPRs that can be allocated by a wave: %d\n",
m_shader_core_properties.min_vgpr_allocation =
shader_core_properties.minVgprAllocation;
printf("Number of available VGPRs: %d\n",
m_shader_core_properties.max_vgpr_allocation =
shader_core_properties.maxVgprAllocation;
printf("VGPRs are allocated in groups of this size: %d\n",
m_shader_core_properties.vgpr_allocation_granularity =
shader_core_properties.vgprAllocationGranularity;
----------------------------------------
=== Version History
* Revision 1, 2018-02-15 (Martin Dinkov)
- Initial draft.