GL_POINTSIZE(3G)

    .SH "NAME" gl_PointSize - contains size of rasterized points, in pixels
    .SH "DECLARATION"

        .PP gl_PointSize is a member of the gl_PerVertex named block:

    out gl_PerVertex {
        highp vec4 gl_Position;
        highp float gl_PointSize;
    };

    .SH "DESCRIPTION"
        .PP In the vertex, tessellation evaluation and geometry languages, a single global instance of the gl_PerVertex named block is available and its gl_PointSize member is an output that receives the intended size of the point to be rasterized, in pixels. It may be written at any time during shader execution.
        .PP In the tessellation control language, the gl_PerVertex named block is used to construct an array, gl_out[], whose members become available as inputs to the subsequent tessellation evaluation shader.
        .PP The value of gl_PointSize (or the gl_PointSize member of the gl_out[] array, in the case of the tessellation control shader) is undefined after the vertex, tessellation control, and tessellation evaluation shading stages if the corresponding shader executable does not write to gl_PointSize. It is also undefined after the geometry processing stage if the geometry shader executable calls EmitVertex() without having written gl_PointSize since the last call to EmitVertex() (or hasn't written it at all).
        .PP In the tessellation control, tessellation evaluation and geometry languages, the gl_PerVertex named block is used to construct an array, gl_in[] of per-vertex or per-control point inputs whose content represents the corresponding outputs written by the previous stage.
        .PP The variable gl_PointSize is intended for a vertex shader to write the size of the point to be rasterized. It is measured in pixels. If gl_PointSize is not written to, its value is undefined in subsequent pipeline stages. If the last active stage is not a vertex shader and does not statically assign a value to gl_PointSize , the point size is 1.0.

    .SH "VERSION SUPPORT"
        .TS allbox tab(:); l l l l l l l l l l l l l l l. T{ gl_PointSize T}:T{ T}:T{ T}:T{ T}:T{ T} T{ gl_PointSize (geometry shader) T}:T{ T}:T{ T}:T{ T}:T{ T} T{ gl_PointSize (tessellation evaluation shader) T}:T{ T}:T{ T}:T{ T}:T{ T}

    .SH "SEE ALSO"
        .PP gl_Position()

    .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