Contact
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Rex Xu [GitHub]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 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
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VK_AMD_TEXTURE_GATHER_BIAS_LOD_SPEC_VERSION
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Extending VkStructureType: - 
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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