GL_SAMPLEPOSITION(3G)

    .SH "NAME" gl_SamplePosition - contains the location of the current sample within the current fragment
    .SH "DECLARATION"

            in
            vec2
            gl_SamplePosition
        ;

    .SH "DESCRIPTION"
        .PP 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, gl_SamplePosition will be (0.5, 0.5).

    .SH "VERSION SUPPORT"
        .TS allbox tab(:); l l l l l. T{ gl_SamplePosition T}:T{ T}:T{ T}:T{ T}:T{ T}

    .SH "SEE ALSO"
        .PP gl_SampleID(), gl_SampleMask(), gl_FragCoord()

    .SH "COPYRIGHT"
        .PP Copyright © 2011-2015 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 © 2011-2015 Khronos Group