📄 fglclearaccum.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fglClearAccum</STRONG> - specify clear values for the accumulation buffer <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> SUBROUTINE <STRONG>fglClearAccum</STRONG>( REAL*4 <EM>red</EM>, REAL*4 <EM>green</EM>, REAL*4 <EM>blue</EM>, REAL*4 <EM>alpha</EM> ) <STRONG>PARAMETERS</STRONG> <EM>red</EM>, <EM>green</EM>, <EM>blue</EM>, <EM>alpha</EM> Specify the red, green, blue, and alpha values used when the accumulation buffer is cleared. The initial values are all 0. <STRONG>DESCRIPTION</STRONG> <STRONG>fglClearAccum</STRONG> specifies the red, green, blue, and alpha values used by <STRONG>fglClear</STRONG> to clear the accumulation buffer. Values specified by <STRONG>fglClearAccum</STRONG> are clamped to the range [-1,1]. <STRONG>ERRORS</STRONG> <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>fglClearAccum</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_ACCUM_CLEAR_VALUE</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>fglClear</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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