Name

VK_AMD_shader_fragment_mask - device extension

VK_AMD_shader_fragment_mask

Name String

VK_AMD_shader_fragment_mask

Extension Type

Device extension

Registered Extension Number

138

Revision

1

Extension and Version Dependencies

• Requires Vulkan 1.0

Contact

• Aaron Hagan https://github.com/KhronosGroup/Vulkan-Docs/issues/new?title=VK_AMD_shader_fragment_mask:%20&body=@AaronHaganAMD%20

Other Extension Metadata

Last Modified Date

2017-08-16

IP Status

No known IP claims.

Interactions and External Dependencies

• This extension requires SPV_AMD_shader_fragment_mask

Contributors

• Aaron Hagan, AMD
• Daniel Rakos, AMD
• Timothy Lottes, AMD

Description

This extension provides efficient read access to the fragment mask in compressed multisampled color surfaces. The fragment mask is a lookup table that associates color samples with color fragment values.

From a shader, the fragment mask can be fetched with a call to fragmentMaskFetchAMD, which returns a single uint where each subsequent four bits specify the color fragment index corresponding to the color sample, starting from the least significant bit. For example, when eight color samples are used, the color fragment index for color sample 0 will be in bits 0-3 of the fragment mask, for color sample 7 the index will be in bits 28-31.

The color fragment for a particular color sample may then be fetched with the corresponding fragment mask value using the fragmentFetchAMD shader function.

New Enum Constants

• AMD_SHADER_FRAGMENT_MASK_EXTENSION_NAME

• AMD_SHADER_FRAGMENT_MASK_SPEC_VERSION

New SPIR-V Capabilities

• FragmentMaskAMD

Examples

This example shows a shader that queries the fragment mask from a multisampled compressed surface and uses it to query fragment values.

#version 450 core

#extension GL_AMD_shader_fragment_mask: enable

layout(binding = 0) uniform sampler2DMS       s2DMS;
layout(binding = 1) uniform isampler2DMSArray is2DMSArray;

layout(binding = 2, input_attachment_index = 0) uniform usubpassInputMS usubpassMS;

layout(location = 0) out vec4 fragColor;

void main()
{
    vec4 fragOne = vec4(0.0);

    uint fragMask = fragmentMaskFetchAMD(s2DMS, ivec2(2, 3));
    uint fragIndex = (fragMask & 0xF0) >> 4;
    fragOne += fragmentFetchAMD(s2DMS, ivec2(2, 3), 1);

    fragMask = fragmentMaskFetchAMD(is2DMSArray, ivec3(2, 3, 1));
    fragIndex = (fragMask & 0xF0) >> 4;
    fragOne += fragmentFetchAMD(is2DMSArray, ivec3(2, 3, 1), fragIndex);

    fragMask = fragmentMaskFetchAMD(usubpassMS);
    fragIndex = (fragMask & 0xF0) >> 4;
    fragOne += fragmentFetchAMD(usubpassMS, fragIndex);

    fragColor = fragOne;
}

Version History

• Revision 1, 2017-08-16 (Aaron Hagan)

  • Initial draft

See Also

No cross-references are available

Document Notes

For more information, see the Vulkan Specification

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