Contact
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Matthew Netsch [GitHub]mnetsch
Other Extension Metadata
- Last Modified Date
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2026-05-08
- Interactions and External Dependencies
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This extension provides API support for
GL_QCOM_image_processing3 -
Interacts with
VK_QCOM_tile_shading -
Interacts with
VK_QCOM_image_processing -
Interacts with
VK_QCOM_image_processing2
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- Contributors
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Matthew Netsch, Qualcomm Technologies, Inc.
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Jonathan Wicks, Qualcomm Technologies, Inc.
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Liang Li, Qualcomm Technologies, Inc.
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Wooyoung Kim, Qualcomm Technologies, Inc.
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Description
This extension introduces a new SPIR-V built-in function to support predefined image gather operations used in popular image processing algorithms such as super resolution upscaling and contrast-adaptive sharpening.
The OpImageGatherQCOM instruction supports the following modes:
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GatherH2QCOM- produces an image gather with an extra horizontal offset -
GatherV2QCOM- produces an image gather with an extra vertical offset. Combined withOpImageGatherandGatherH2QCOM, this is useful for creating a 12-tap filter for upscaling. -
GatherDQCOM- produces an image gather by sampling the cardinal offsets. Combined with a point sample of the center texel, this is useful for creating a 5-tap sharpening filter (eg. CAS). -
Gather4x1QCOM- produces an image gather by sampling 4 texels in a horizontal row. This is useful for kernels requiring vectorized loads, and can help with cache locality for linear access.
Each of the image processing instructions operate on the same sampled images
that the OpImage*Gather instructions support with the exception of
cube-maps, depth comparison, ConstOffsets, and sparse residency check.
Implementations of this extension should support these operations natively at the HW instruction level, offering potential performance gains as well as ease of development.
This extension also adds some block matching improvements over
VK_QCOM_image_processing and VK_QCOM_image_processing2 by
exposing more formats and wrap modes.
New Enum Constants
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VK_QCOM_IMAGE_PROCESSING_3_EXTENSION_NAME -
VK_QCOM_IMAGE_PROCESSING_3_SPEC_VERSION -
Extending VkStructureType:
If VK_QCOM_image_processing is supported:
Document Notes
For more information, see the Vulkan Specification.
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.