glPolygonOffset man page on OpenBSD

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GLPOLYGONOFFSET(3G)					   GLPOLYGONOFFSET(3G)

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

C SPECIFICATION
       void glPolygonOffset( GLfloat factor,
	    GLfloat units )

       delim $$

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.

NOTES
       glPolygonOffset is available only if the GL version is 1.1 or greater.

       glPolygonOffset has no effect on depth coordinates placed in the
       feedback buffer.

       glPolygonOffset has no effect on selection.

ERRORS
       GL_INVALID_OPERATION is generated if glPolygonOffset is executed
       between the execution of glBegin and the corresponding execution of
       glEnd.

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(3G), glEnable(3G), glGet(3G), glIsEnabled(3G)

								 March 1, 2011
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