glPolygonOffsetEXT man page on Solaris

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GLPOLYGONOFFSETEXT(3gl)				       GLPOLYGONOFFSETEXT(3gl)

NAME
       glPolygonOffsetEXT  -  set  the	scale and bias used to calculate depth
       values

C SPECIFICATION
       void glPolygonOffsetEXT( GLfloat factor,
				GLfloat bias )

PARAMETERS
       factor  Specifies a scale factor multiplied by  an  implementation-spe‐
	       cific value to create a variable depth offset for each polygon.
	       The initial value is 0.

       bias    Is added to create a constant depth offset. The	initial	 value
	       is 0.

DESCRIPTION
       When GL_POLYGON_OFFSET_EXT is enabled, each fragment's depth value will
       be offset after it is interpolated from the depth values of the	appro‐
       priate  vertices.   The value of the offset is factor*DZ+bias, where DZ
       is a measurement of the change in depth relative to the screen area  of
       the  polygon.   The  offset is added before the depth test is performed
       and before the value is written into the depth buffer.

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

NOTES
       glPolygonOffsetEXT is part of the GL_EXT_polygon_offset extension.   If
       GL_EXT_polygon_offset  is  included  in	the  string returned by glGet‐
       String, when called with argument GL_EXTENSIONS, extension GL_EXT_poly‐
       gon_offset is supported by the connection.

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

       glPolygonOffsetEXT has no effect on selection.

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

ASSOCIATED GETS
       glIsEnabled with argument GL_POLYGON_OFFSET_EXT.

       glGet with  argument  GL_POLYGON_OFFSET_FACTOR_EXT  or  GL_POLYGON_OFF‐
       SET_BIAS_EXT.

SEE ALSO
       glDepthFunc, glDisable, glEnable, glGet, glIsEnabled, glLineWidth, glS‐
       tencilOp, glTexEnv

				   13 May 98	       GLPOLYGONOFFSETEXT(3gl)
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