105 lines
2.7 KiB
Plaintext
105 lines
2.7 KiB
Plaintext
include::meta/VK_AMD_texture_gather_bias_lod.txt[]
|
|
|
|
*Last Modified Date*::
|
|
2017-03-21
|
|
*IP Status*::
|
|
No known IP claims.
|
|
*Interactions and External Dependencies*::
|
|
- Requires the
|
|
https://www.khronos.org/registry/spir-v/extensions/AMD/SPV_AMD_texture_gather_bias_lod.html[+SPV_AMD_texture_gather_bias_lod+]
|
|
SPIR-V extension.
|
|
*Contributors*::
|
|
- Dominik Witczak, AMD
|
|
- Daniel Rakos, AMD
|
|
- Graham Sellers, AMD
|
|
- Matthaeus G. Chajdas, AMD
|
|
- Qun Lin, AMD
|
|
- Rex Xu, AMD
|
|
- Timothy Lottes, AMD
|
|
|
|
This extension adds two related features.
|
|
|
|
Firstly, support for the following SPIR-V extension in Vulkan is added:
|
|
|
|
* +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 Object Types
|
|
|
|
None.
|
|
|
|
=== New Enum Constants
|
|
|
|
* Extending elink:VkStructureType:
|
|
** ename:VK_STRUCTURE_TYPE_TEXTURE_LOD_GATHER_FORMAT_PROPERTIES_AMD
|
|
|
|
=== New Enums
|
|
|
|
None.
|
|
|
|
=== New SPIR-V Capabilities
|
|
|
|
* <<spirvenv-capabilities-table-imagegatherbiaslodamd,code:ImageGatherBiasLodAMD>>
|
|
|
|
=== New Structures
|
|
|
|
* slink:VkTextureLODGatherFormatPropertiesAMD
|
|
|
|
=== New Functions
|
|
|
|
None.
|
|
|
|
=== Examples
|
|
|
|
[source,c++]
|
|
--------------------------------------
|
|
|
|
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.
|
|
}
|
|
--------------------------------------
|
|
|
|
=== Version History
|
|
|
|
* Revision 1, 2017-03-21 (Dominik Witczak)
|
|
- Initial draft
|