Contact
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Rex Xu amdrexu
Other Extension Metadata
- Last Modified Date
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2017-03-21
- IP Status
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No known IP claims.
- Interactions and External Dependencies
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This extension requires
SPV_AMD_texture_gather_bias_lod -
This extension provides API support for
GL_AMD_texture_gather_bias_lod
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- Contributors
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Dominik Witczak, AMD
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Daniel Rakos, AMD
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Graham Sellers, AMD
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Matthaeus G. Chajdas, AMD
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Qun Lin, AMD
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Rex Xu, AMD
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Timothy Lottes, AMD
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Description
This extension adds two related features.
Firstly, support for the following SPIR-V extension in Vulkan is added:
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SPV_AMD_texture_gather_bias_lod
Secondly, the extension allows the application to query which formats can be used together with the new function prototypes introduced by the SPIR-V extension.
New Enum Constants
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VK_AMD_TEXTURE_GATHER_BIAS_LOD_EXTENSION_NAME -
VK_AMD_TEXTURE_GATHER_BIAS_LOD_SPEC_VERSION -
Extending VkStructureType:
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VK_STRUCTURE_TYPE_TEXTURE_LOD_GATHER_FORMAT_PROPERTIES_AMD
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Examples
struct VkTextureLODGatherFormatPropertiesAMD
{
VkStructureType sType;
const void* pNext;
VkBool32 supportsTextureGatherLODBiasAMD;
};
// ----------------------------------------------------------------------------------------
// How to detect if an image format can be used with the new function prototypes.
VkPhysicalDeviceImageFormatInfo2 formatInfo;
VkImageFormatProperties2 formatProps;
VkTextureLODGatherFormatPropertiesAMD textureLODGatherSupport;
textureLODGatherSupport.sType = VK_STRUCTURE_TYPE_TEXTURE_LOD_GATHER_FORMAT_PROPERTIES_AMD;
textureLODGatherSupport.pNext = nullptr;
formatInfo.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_IMAGE_FORMAT_INFO_2;
formatInfo.pNext = nullptr;
formatInfo.format = ...;
formatInfo.type = ...;
formatInfo.tiling = ...;
formatInfo.usage = ...;
formatInfo.flags = ...;
formatProps.sType = VK_STRUCTURE_TYPE_IMAGE_FORMAT_PROPERTIES_2;
formatProps.pNext = &textureLODGatherSupport;
vkGetPhysicalDeviceImageFormatProperties2(physical_device, &formatInfo, &formatProps);
if (textureLODGatherSupport.supportsTextureGatherLODBiasAMD == VK_TRUE)
{
// physical device supports SPV_AMD_texture_gather_bias_lod for the specified
// format configuration.
}
else
{
// physical device does not support SPV_AMD_texture_gather_bias_lod for the
// specified format configuration.
}Document Notes
For more information, see the Vulkan Specification
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