readco(3G)

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

FORTRAN 77 SPECIFICATION
     subroutine readco(mode)
     integer*4 mode

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

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

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

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

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

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

DESCRIPTION
     readco specifies the component source buffer from the pixel source buffer
     that rectco, readpi, readRG, rectre, and lrectr  use.

SEE ALSO
     lrectr, readpi, readRG, rectco

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