📄 fglclearindex.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fglClearIndex</STRONG> - specify the clear value for the color index buffers <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> SUBROUTINE <STRONG>fglClearIndex</STRONG>( REAL*4 <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>fglClearIndex</STRONG> specifies the index used by <STRONG>fglClear</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>fglClearIndex</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_INDEX_CLEAR_VALUE</STRONG> <STRONG>fglGet</STRONG> with argument <STRONG>GL_INDEX_BITS</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>fglClear</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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