?? indexmask.html
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<STRONG>NAME</STRONG>
<STRONG>glIndexMask</STRONG> - control the writing of individual bits in the
color index buffers
<STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
void <STRONG>glIndexMask</STRONG>( GLuint <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>glIndexMask</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>glDrawBuffer</STRONG>). Initially, all bits are enabled for writing.
<STRONG>ERRORS</STRONG>
<STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glIndexMask</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_WRITEMASK</STRONG>
<STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>
<STRONG>glColorMask</STRONG>, <STRONG>glDepthMask</STRONG>, <STRONG>glDrawBuffer</STRONG>, <STRONG>glIndex</STRONG>,
<STRONG>glIndexPointer</STRONG>, <STRONG>glStencilMask</STRONG>
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