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GuruMeditation
Docs » Autodocs » graphics.library » MrgCop

NAME

       MrgCop -- Merge together coprocessor instructions.

SYNOPSIS

       error = MrgCop( View )
d0 A1
ULONG MrgCop( struct View * );

FUNCTION

       Merge together the display, color, sprite and user coprocessor
instructions into a single coprocessor instruction stream. This
essentially creates a per-display-frame program for the coprocessor.
This function MrgCop is used, for example, by the graphics animation
routines which effectively add information into an essentially
static background display. This changes some of the user
or sprite instructions, but not those which have formed the
basic display in the first place. When all forms of coprocessor
instructions are merged together, you will have a complete per-
frame instruction list for the coprocessor.
Restrictions: Each of the coprocessor instruction lists MUST be
internally sorted in min to max Y-X order. The merge routines
depend on this! Each list must be terminated using CEND(copperlist).

INPUTS

       View - a pointer to the view structure whose coprocessor
instructions are to be merged.

RESULT

       The view structure will now contain a complete, sorted/merged
list of instructions for the coprocessor, ready to be used by
the display processor. The display processor is told to use
this new instruction stream through the instruction LoadView().
From V39, MrgCop() can return a ULONG error value (previous versions
returned void), to indicate that either there was insufficient memory
to build the system copper lists, or that MrgCop() had no work to do
if, for example, there were no ViewPorts in the list.
You should check for these error values - they are defined in
<graphics/view.h>.

BUGS

SEE ALSO

InitVPort(), MakeVPort(), LoadView(), <graphics/view.h>, intuition.library/RethinkDisplay()

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