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     <STRONG>NAME</STRONG>
	  <STRONG>glDepthFunc</STRONG> -	specify	the value used for depth buffer
	  comparisons


     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
	  void <STRONG>glDepthFunc</STRONG>( GLenum <EM>func</EM>	)


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

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

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

	  <STRONG>GL_NEVER</STRONG>	  Never	passes.

	  <STRONG>GL_LESS</STRONG>	  Passes if the	incoming depth value is	less
			  than the stored depth	value.

	  <STRONG>GL_EQUAL</STRONG>	  Passes if the	incoming depth value is	equal
			  to the stored	depth value.

	  <STRONG>GL_LEQUAL</STRONG>	  Passes if the	incoming depth value is	less
			  than or equal	to the stored depth value.

	  <STRONG>GL_GREATER</STRONG>	  Passes if the	incoming depth value is
			  greater than the stored depth	value.

	  <STRONG>GL_NOTEQUAL</STRONG>	  Passes if the	incoming depth value is	not
			  equal	to the stored depth value.

	  <STRONG>GL_GEQUAL</STRONG>	  Passes if the	incoming depth value is
			  greater than or equal	to the stored depth
			  value.

	  <STRONG>GL_ALWAYS</STRONG>	  Always passes.

	  The initial value of <EM>func</EM> is <STRONG>GL_LESS</STRONG>.	 Initially, depth
	  testing is disabled.	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.
     <STRONG>ERRORS</STRONG>
	  <STRONG>GL_INVALID_ENUM</STRONG> is generated if <EM>func</EM> is not an accepted
	  value.

	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glDepthFunc</STRONG> is executed
	  between the execution	of <STRONG>glBegin</STRONG> and the corresponding
	  execution of <STRONG>glEnd</STRONG>.

     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>
	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_DEPTH_FUNC</STRONG>
	  <STRONG>glIsEnabled</STRONG> with argument <STRONG>GL_DEPTH_TEST</STRONG>

     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>
	  <STRONG>glDepthRange</STRONG>,	<STRONG>glEnable</STRONG>, <STRONG>glPolygonOffset</STRONG>






































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