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Extension Proposal

2022-07-08

Interactions and External Dependencies
Contributors
• Jeff Leger, Qualcomm Technologies, Inc.

• Ruihao Zhang, Qualcomm Technologies, Inc.

Description

GPUs are commonly used to process images for various applications from 3D graphics to UI and from composition to compute applications. Simple scaling and filtering can be done with bilinear filtering, which comes for free during texture sampling. However, as screen sizes get larger and more use-cases rely on GPU such as camera and video post-processing needs, there is increasing demand for GPU to support higher order filtering and other advanced image processing.

This extension introduces a new set of SPIR-V built-in functions for image processing. It exposes the following new imaging operations

• The OpImageSampleWeightedQCOM instruction takes 3 operands: sampled image, weight image, and texture coordinates. The instruction computes a weighted average of an MxN region of texels in the sampled image, using a set of MxN weights in the weight image.

• The OpImageBoxFilterQCOM instruction takes 3 operands: sampled image, box size, and texture coordinates. Note that box size specifies a floating point width and height in texels. The instruction computes a weighted average of all texels in the sampled image that are covered (either partially or fully) by a box with the specified size and centered at the specified texture coordinates.

• The OpImageBlockMatchSADQCOM and OpImageBlockMatchSSDQCOM instructions each takes 5 operands: target image, target coordinates, reference image, reference coordinates, and block size. Each instruction computes an error metric, that describes whether a block of texels in the target image matches a corresponding block of texels in the reference image. The error metric is computed per-component. OpImageBlockMatchSADQCOM computes "Sum Of Absolute Difference" and OpImageBlockMatchSSDQCOM computes "Sum of Squared Difference".

Each of the image processing instructions operate only on 2D images. The instructions do not-support sampling of mipmap, multi-plane, multi-layer, multi-sampled, or depth/stencil images. The instructions can be used in any shader stage.

Implementations of this this extension should support these operations natively at the HW instruction level, offering potential performance gains as well as ease of development.

New Enum Constants

• VK_QCOM_IMAGE_PROCESSING_EXTENSION_NAME

• VK_QCOM_IMAGE_PROCESSING_SPEC_VERSION

• Extending VkDescriptorType:

• VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM

• VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM

• Extending VkImageUsageFlagBits:

• VK_IMAGE_USAGE_SAMPLE_BLOCK_MATCH_BIT_QCOM

• VK_IMAGE_USAGE_SAMPLE_WEIGHT_BIT_QCOM

• Extending VkSamplerCreateFlagBits:

• VK_SAMPLER_CREATE_IMAGE_PROCESSING_BIT_QCOM

• Extending VkStructureType:

• VK_STRUCTURE_TYPE_IMAGE_VIEW_SAMPLE_WEIGHT_CREATE_INFO_QCOM

• VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_IMAGE_PROCESSING_FEATURES_QCOM

• VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_IMAGE_PROCESSING_PROPERTIES_QCOM

If VK_KHR_format_feature_flags2 is supported:

• Extending VkFormatFeatureFlagBits2:

• VK_FORMAT_FEATURE_2_BLOCK_MATCHING_BIT_QCOM

• VK_FORMAT_FEATURE_2_BOX_FILTER_SAMPLED_BIT_QCOM

• VK_FORMAT_FEATURE_2_WEIGHT_IMAGE_BIT_QCOM

• VK_FORMAT_FEATURE_2_WEIGHT_SAMPLED_IMAGE_BIT_QCOM

Version History

• Revision 1, 2022-07-08 (Jeff Leger)

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.

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