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# docs.GL

GLSL 4

# gl_SampleMaskIn

## Name

gl_SampleMaskIn — contains the computed sample coverage mask for the current fragment

## Declaration

`in int gl_SampleMaskIn[] ;`

## Description

`gl_SampleMaskIn` is a fragment language that indicates the set of samples covered by the primitive generating the fragment during multisample rasterization. It has a sample bit set if and only if the sample is considered covered for this fragment shader invocation. Bit B of mask `gl_SampleMask[M]` corresponds to sample 32 * M + B. The array has `ceil`(s / 32) elements where s is the maximum number of color samples supported by the implementation.

## Version Support

| OpenGL Shading Language Version
--- | ---
Variable Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50
gl_SampleMaskIn | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

gl_SampleMask, gl_SampleID, gl_SamplePosition, gl_FragCoord

## Copyright

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.

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