glPolygonOffset man page on Oracle

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GLPOLYGONOFFSET(3G)		 OpenGL Manual		   GLPOLYGONOFFSET(3G)

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.

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

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

AUTHORS
       opengl.org

opengl.org			  04/29/2014		   GLPOLYGONOFFSET(3G)
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