clearindex.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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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>glClearIndex</STRONG> - specify the clear value for the color index	  buffers     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>	  void <STRONG>glClearIndex</STRONG>( GLfloat <EM>c</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>c</EM>  Specifies the index used when the color index buffers are	     cleared.  The initial value is 0.     <STRONG>DESCRIPTION</STRONG>	  <STRONG>glClearIndex</STRONG> specifies the index used	by <STRONG>glClear</STRONG> to clear	  the color index buffers.  <EM>c</EM> is not clamped.  Rather, <EM>c</EM> is	  converted to a fixed-point value with	unspecified precision	  to the right of the binary point.  The integer part of this	  value	is then	masked with 2m-1, where	m is the number	of	  bits in a color index	stored in the frame buffer.     <STRONG>ERRORS</STRONG>	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glClearIndex</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_INDEX_CLEAR_VALUE</STRONG>	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_INDEX_BITS</STRONG>     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>glClear</STRONG></PRE></BODY></HTML>

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