bionic (3) glPolygonOffset.3G.gz

Provided by: opengl-4-man-doc_1.0~svn33624-1_all bug

NAME
       glPolygonOffset - set the scale and units used to calculate depth values


C SPECIFICATION
       void glPolygonOffset(GLfloat factor, GLfloat units);


PARAMETERS
       factor
           Specifies a scale factor that is used to create a variable depth offset for each polygon. The initial
           value is 0.

       units
           Is multiplied by an implementation-specific value to create a constant depth offset. The initial
           value is 0.


DESCRIPTION
       When GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFFSET_POINT is enabled, each
       fragment's depth value will be offset after it is interpolated from the depth values of the appropriate
       vertices. The value of the offset is factor × DZ + r × units, where DZ is a measurement of the change in
       depth relative to the screen area of the polygon, and r is the smallest value that is guaranteed to
       produce a resolvable offset for a given implementation. The offset is added before the depth test is
       performed and before the value is written into the depth buffer.

       glPolygonOffset is useful for rendering hidden-line images, for applying decals to surfaces, and for
       rendering solids with highlighted edges.


ASSOCIATED GETS
       glIsEnabled() with argument GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFFSET_POINT.

       glGet() with argument GL_POLYGON_OFFSET_FACTOR or GL_POLYGON_OFFSET_UNITS.


VERSION SUPPORT
       ┌────────────────┬───────────────────────────────────────────────────────────────────────┐
       │                │                OpenGL Version                                         │
       ├────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │Function        │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │/               │     │     │     │     │     │     │     │     │     │     │     │     │
       │Feature         │     │     │     │     │     │     │     │     │     │     │     │     │
       │Name            │     │     │     │     │     │     │     │     │     │     │     │     │
       ├────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glPolygonOffset │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       └────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘


SEE ALSO
       glDepthFunc(), glEnable(), glGet(), glIsEnabled()


       Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is
       licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.


       Copyright © 1991-2006 Silicon Graphics, Inc.
       Copyright © 2010-2014 Khronos Group

[FIXME: source]                                    01/03/2018                                GLPOLYGONOFFSET(3G)