gldepthfunc man page on Solaris

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GLDEPTHFUNC(3gl)					      GLDEPTHFUNC(3gl)

NAME
       glDepthFunc - specify the value used for depth buffer comparisons

C SPECIFICATION
       void glDepthFunc( GLenum func )

PARAMETERS
       func  Specifies	the  depth  comparison	function.   Symbolic constants
	     GL_NEVER, GL_LESS, GL_EQUAL, GL_LEQUAL, GL_GREATER,  GL_NOTEQUAL,
	     GL_GEQUAL,	 and  GL_ALWAYS	 are  accepted.	  The initial value is
	     GL_LESS.

DESCRIPTION
       glDepthFunc specifies the function used to compare each incoming	 pixel
       depth value with the depth value present in the depth buffer.  The com‐
       parison is performed only if depth testing is enabled.	(See  glEnable
       and glDisable of GL_DEPTH_TEST.)

       func specifies the conditions under which the pixel will be drawn.  The
       comparison functions are as follows:

       GL_NEVER	       Never passes.

       GL_LESS	       Passes if the incoming depth value  is  less  than  the
		       stored depth value.

       GL_EQUAL	       Passes  if  the	incoming  depth	 value is equal to the
		       stored depth value.

       GL_LEQUAL       Passes if the incoming depth  value  is	less  than  or
		       equal to the stored depth value.

       GL_GREATER      Passes  if the incoming depth value is greater than the
		       stored depth value.

       GL_NOTEQUAL     Passes if the incoming depth value is not equal to  the
		       stored depth value.

       GL_GEQUAL       Passes  if  the incoming depth value is greater than or
		       equal to the stored depth value.

       GL_ALWAYS       Always passes.

       The initial value of func is GL_LESS.  Initially, depth testing is dis‐
       abled.  Even if the depth buffer exists and the depth mask is non-zero,
       the depth buffer is not updated if the depth test is disabled.

ERRORS
       GL_INVALID_ENUM is generated if func is not an accepted value.

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

ASSOCIATED GETS
       glGet with argument GL_DEPTH_FUNC
       glIsEnabled with argument GL_DEPTH_TEST

SEE ALSO
       glDepthRange, glEnable, glPolygonOffset

				   15 Mar 97		      GLDEPTHFUNC(3gl)
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