colormask.html

来自「glman函数说明 glman函数说明 glman函数说明」· HTML 代码 · 共 59 行

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     <STRONG>NAME</STRONG>
	  <STRONG>glColorMask</STRONG> -	enable and disable writing of frame buffer
	  color	components


     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
	  void <STRONG>glColorMask</STRONG>( GLboolean <EM>red</EM>,
			    GLboolean <EM>green</EM>,
			    GLboolean <EM>blue</EM>,
			    GLboolean <EM>alpha</EM> )


     <STRONG>PARAMETERS</STRONG>
	  <EM>red</EM>, <EM>green</EM>, <EM>blue</EM>, <EM>alpha</EM>
				Specify	whether	red, green, blue, and
				alpha can or cannot be written into
				the frame buffer.  The initial values
				are all	<STRONG>GL_TRUE</STRONG>, indicating that the
				color components can be	written.

     <STRONG>DESCRIPTION</STRONG>
	  <STRONG>glColorMask</STRONG> specifies	whether	the individual color
	  components in	the frame buffer can or	cannot be written.  If
	  <EM>red</EM> is <STRONG>GL_FALSE</STRONG>, for example,	no change is made to the red
	  component of any pixel in any	of the color buffers,
	  regardless of	the drawing operation attempted.

	  Changes to individual	bits of	components cannot be
	  controlled.  Rather, changes are either enabled or disabled
	  for entire color components.

     <STRONG>ERRORS</STRONG>
	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glColorMask</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_COLOR_WRITEMASK</STRONG>
	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_RGBA_MODE</STRONG>

     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>
	  <STRONG>glColor</STRONG>, <STRONG>glColorPointer</STRONG>, <STRONG>glDepthMask</STRONG>,	<STRONG>glIndex</STRONG>,
	  <STRONG>glIndexPointer</STRONG>, <STRONG>glIndexMask</STRONG>, <STRONG>glStencilMask</STRONG>









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