readcomponent(3G)					     readcomponent(3G)

NAME    [Toc]    [Back]

     readcomponent - sets the component	source within the framebuffer source
     for pixels	that various routines read, useful primarily for monochrome
     image processing.

C SPECIFICATION    [Toc]    [Back]

     void readcomponent(long mode)

PARAMETERS    [Toc]    [Back]

     src    expects a symbolic constant	that identifies	the pixel component
	    that is to be used:

	    RC_ABGR Indicates that all 4 frame buffer components, ABGR should
	    be transferred.  This is the default.

	    RC_ALPHA selects the alpha channel of the current framebuffer
	    selected by	readsource.

	    RC_BLUE selects the	blue channel of	the current framebuffer
	    selected by	readsource.

	    RC_GREEN selects the green channel of the current framebuffer
	    selected by	readsource.

	    RC_RED selects the red channel of the current framebuffer selected
	    by readsource.

DESCRIPTION    [Toc]    [Back]

     readcomponent specifies the component source buffer from the pixel	source
     buffer that rectcopy, readpixels, readRGB,	rectread, lrectread, and
     fbsubtexload use.

SEE ALSO    [Toc]    [Back]

     lrectread,	readpixels, readRGB, rectcopy, fbsubtexload

NOTES    [Toc]    [Back]

     This subroutine is	available only in immediate mode and only on
     RealityEngine systems running 5.0.1 or later.


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