Package org.lwjgl.vulkan
Class AMDShaderFragmentMask
java.lang.Object
org.lwjgl.vulkan.AMDShaderFragmentMask
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.
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;
}
VK_AMD_shader_fragment_mask
- Name String
VK_AMD_shader_fragment_mask
- Extension Type
- Device extension
- Registered Extension Number
- 138
- Revision
- 1
- Contact
- Aaron Hagan AaronHaganAMD
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
- This extension provides API support for
GL_AMD_shader_fragment_mask
- This extension requires
- Contributors
- Aaron Hagan, AMD
- Daniel Rakos, AMD
- Timothy Lottes, AMD
-
Field Summary
Modifier and TypeFieldDescriptionstatic final String
The extension name.static final int
The extension specification version. -
Method Summary
-
Field Details
-
VK_AMD_SHADER_FRAGMENT_MASK_SPEC_VERSION
public static final int VK_AMD_SHADER_FRAGMENT_MASK_SPEC_VERSIONThe extension specification version.- See Also:
-
VK_AMD_SHADER_FRAGMENT_MASK_EXTENSION_NAME
The extension name.- See Also:
-