📄 fglindexmask.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fglIndexMask</STRONG> - control the writing of individual bits in the color index buffers <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> SUBROUTINE <STRONG>fglIndexMask</STRONG>( INTEGER*4 <EM>mask</EM> ) <STRONG>PARAMETERS</STRONG> <EM>mask</EM> Specifies a bit mask to enable and disable the writing of individual bits in the color index buffers. Initially, the mask is all 1's. <STRONG>DESCRIPTION</STRONG> <STRONG>fglIndexMask</STRONG> controls the writing of individual bits in the color index buffers. The least significant n bits of <EM>mask</EM>, where n is the number of bits in a color index buffer, specify a mask. Where a 1 (one) appears in the mask, it's possible to write to the corresponding bit in the color index buffer (or buffers). Where a 0 (zero) appears, the corresponding bit is write-protected. This mask is used only in color index mode, and it affects only the buffers currently selected for writing (see <STRONG>fglDrawBuffer</STRONG>). Initially, all bits are enabled for writing. <STRONG>ERRORS</STRONG> <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>fglIndexMask</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_WRITEMASK</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>fglColorMask</STRONG>, <STRONG>fglDepthMask</STRONG>, <STRONG>fglDrawBuffer</STRONG>, <STRONG>fglIndex</STRONG>, <STRONG>fglIndexPointer</STRONG>, <STRONG>fglStencilMask</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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