?? fglcolormask.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fglColorMask</STRONG> - enable and disable writing of frame buffer color components <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> SUBROUTINE <STRONG>fglColorMask</STRONG>( LOGICAL*1 <EM>red</EM>, LOGICAL*1 <EM>green</EM>, LOGICAL*1 <EM>blue</EM>, LOGICAL*1 <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>fglColorMask</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>fglColorMask</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_COLOR_WRITEMASK</STRONG> <STRONG>fglGet</STRONG> with argument <STRONG>GL_RGBA_MODE</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>fglColor</STRONG>, <STRONG>fglColorPointer</STRONG>, <STRONG>fglDepthMask</STRONG>, <STRONG>fglIndex</STRONG>, <STRONG>fglIndexPointer</STRONG>, <STRONG>fglIndexMask</STRONG>, <STRONG>fglStencilMask</STRONG></PRE></BODY></HTML>?? 快捷鍵說明
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