fgldepthrange.html

来自「计算机图形学～想必是很多人需要的～在此共享一下」· HTML 代码 · 共 59 行

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59 行

<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>fglDepthRange</STRONG>	- specify mapping of depth values from	  normalized device coordinates	to window coordinates     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fglDepthRange</STRONG>( REAL*4 <EM>zNear</EM>,				    REAL*4 <EM>zFar</EM>	)     <STRONG>PARAMETERS</STRONG>	  <EM>zNear</EM>	 Specifies the mapping of the near clipping plane to		 window	coordinates.  The initial value	is 0.	  <EM>zFar</EM>	 Specifies the mapping of the far clipping plane to		 window	coordinates.  The initial value	is 1.     <STRONG>DESCRIPTION</STRONG>	  After	clipping and division by <EM>w</EM>, depth coordinates range	  from -1 to 1,	corresponding to the near and far clipping	  planes.  <STRONG>fglDepthRange</STRONG> specifies a linear mapping of the	  normalized depth coordinates in this range to	window depth	  coordinates.	Regardless of the actual depth buffer	  implementation, window coordinate depth values are treated	  as though they range from 0 through 1	(like color	  components).	Thus, the values accepted by <STRONG>fglDepthRange</STRONG> are	  both clamped to this range before they are accepted.	  The setting of (0,1) maps the	near plane to 0	and the	far	  plane	to 1.  With this mapping, the depth buffer range is	  fully	utilized.     <STRONG>NOTES</STRONG>	  It is	not necessary that <EM>zNear</EM> be less than <EM>zFar</EM>.  Reverse	  mappings such	as zNear=1, and	zFar=0 are acceptable.     <STRONG>ERRORS</STRONG>	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>fglDepthRange</STRONG> is	  executed between the execution of <STRONG>fglBegin</STRONG> and the	  corresponding	execution of <STRONG>fglEnd</STRONG>.     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>	  <STRONG>fglGet</STRONG> with argument <STRONG>GL_DEPTH_RANGE</STRONG>     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>fglDepthFunc</STRONG>,	<STRONG>fglPolygonOffset</STRONG>, <STRONG>fglViewport</STRONG></PRE></BODY></HTML>

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