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* Update release number to 120.
Github Issues:
* Add slink:VkAccelerationStructureTypeNV explicitly to extension XML for
`<<VK_NV_ray_tracing>>` (public issue 848).
* Add missing valid usage statements for feature flags in
slink:VkCommandBufferInheritanceInfo (public pull request 1017).
Internal Issues:
* Clarify behavior of non-premultiplied destination colors for
`<<VK_EXT_blend_operation_advanced>>` prior to the definition of
slink:VkBlendOverlapEXT (internal issue 1766).
* Fix the confusing phrasing "`no other queue must: be (doing something)`"
for flink:vkQueuePresentKHR, flink:vkQueueSubmit, and
flink:vkQueueBindSparse (internal issue 1774).
* Add `<<VK_EXT_validation_features>>` flag to enable best practices
checks, which will soon be available in the validation layer (internal
issue 1779).
* Specify allowed characters for VUID tag name components in the style
guide (internal issue 1788).
* Update links to SPIR-V extension specifications, and parameterize their
markup in case the URLs change in the future (internal issue 1797).
* Fix an off-by-one error in the valid usage statement for
slink:VkPipelineExecutableInfoKHR (internal merge request 3303).
* Clean up markup indentation not matching the style guide (internal merge
request 3314).
* Minor script updates to allow refpage aliases, generate a dynamic TOC
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similar to the OpenCL 2.2 refpages (internal merge request 3322).
* Script updates to add tests to the checker, refactor and reformat code,
generate better text for some valid usage statements, use more Pythonic
idioms, and synchronize with the OpenXR scripts (internal merge request
3239).
* Script updates and minor fixes in spec language to not raise checker
errors for refpage markup of pages not existing in the API, such as
VKAPI_NO_STDINT_H. Remove corresponding suppression of some
check_spec_links.py tests from .gitlab-ci.yml and 'allchecks' target
(internal merge request 3315).
99 lines
2.5 KiB
Plaintext
99 lines
2.5 KiB
Plaintext
include::meta/VK_AMD_shader_fragment_mask.txt[]
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*Last Modified Date*::
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2017-08-16
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*IP Status*::
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No known IP claims.
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*Dependencies*::
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- Requires the
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{spirv}/AMD/SPV_AMD_shader_fragment_mask.html[`SPV_AMD_shader_fragment_mask`]
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SPIR-V extension.
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*Contributors*::
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- Aaron Hagan, AMD
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- Daniel Rakos, AMD
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- Timothy Lottes, AMD
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This extension provides efficient read access to the fragment mask in
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compressed multisampled color surfaces.
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The fragment mask is a lookup table that associates color samples with color
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fragment values.
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From a shader, the fragment mask can be fetched with a call to
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code:fragmentMaskFetchAMD, which returns a single code:uint where each
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subsequent four bits specify the color fragment index corresponding to the
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color sample, starting from the least significant bit.
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For example, when eight color samples are used, the color fragment index for
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color sample 0 will be in bits 0-3 of the fragment mask, for color sample 7
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the index will be in bits 28-31.
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The color fragment for a particular color sample may then be fetched with
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the corresponding fragment mask value using the code:fragmentFetchAMD shader
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function.
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=== New Object Types
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None.
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=== New Enum Constants
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None.
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=== New Enums
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None.
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=== New SPIR-V Capabilities
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* <<spirvenv-capabilities-table-fragmentmaskamd, code:FragmentMaskAMD>>
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=== New Structures
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None.
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=== New Functions
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None.
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=== Examples
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This example shows a shader that queries the fragment mask from a
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multisampled compressed surface and uses it to query fragment values.
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[source,c++]
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----------------------------------------
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#version 450 core
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#extension GL_AMD_shader_fragment_mask: enable
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layout(binding = 0) uniform sampler2DMS s2DMS;
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layout(binding = 1) uniform isampler2DMSArray is2DMSArray;
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layout(binding = 2, input_attachment_index = 0) uniform usubpassInputMS usubpassMS;
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layout(location = 0) out vec4 fragColor;
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void main()
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{
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vec4 fragOne = vec4(0.0);
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uint fragMask = fragmentMaskFetchAMD(s2DMS, ivec2(2, 3));
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uint fragIndex = (fragMask & 0xF0) >> 4;
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fragOne += fragmentFetchAMD(s2DMS, ivec2(2, 3), 1);
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fragMask = fragmentMaskFetchAMD(is2DMSArray, ivec3(2, 3, 1));
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fragIndex = (fragMask & 0xF0) >> 4;
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fragOne += fragmentFetchAMD(is2DMSArray, ivec3(2, 3, 1), fragIndex);
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fragMask = fragmentMaskFetchAMD(usubpassMS);
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fragIndex = (fragMask & 0xF0) >> 4;
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fragOne += fragmentFetchAMD(usubpassMS, fragIndex);
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fragColor = fragOne;
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}
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----------------------------------------
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=== Version History
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* Revision 1, 2017-08-16 (Aaron Hagan)
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- Initial draft
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