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CentOS 7.0 - man page for glpolygonoffset (centos section 3g)

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 x DZ + r x 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 (C) 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 06/10/2014 GLPOLYGONOFFSET(3G)


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