gl_SamplePosition.3G - Man Page
contains the location of the current sample within the current fragment
Declaration
in vec2 gl_SamplePosition ;.SH "DESCRIPTION"
gl_SamplePosition is a fragment language input variable that contains the location within a fragment of the sample currently being processed. The x and y components of gl_SamplePosition contain the sub-pixel coordinate of the current sample and will have values in the range 0.0 to 1.0. The sub-pixel coordinates of the center of the pixel are always (0.5, 0.5). Any static use of gl_SamplePosition causes the entire fragment shader to be evaluated per-sample rather than per-fragment. When rendering to a non-multisample buffer, or if multisample rasterization is disabled, gl_SamplePosition will be (0.5, 0.5).
Version Support
| OpenGL Shading Language Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function 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_SamplePosition | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
See Also
gl_SampleID(), gl_SampleMask(), 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. http://opencontent.org/openpub/.
Copyright
Copyright © 2011-2014 Khronos Group
Referenced By
gl_NumSamples.3G(3), gl_SampleID.3G(3), gl_SampleMask.3G(3), gl_SampleMaskIn.3G(3).