12-07-2014
My FORTRAN is not just a bit rusty, but has entirely corroded away.
Still, from staring at above function, I'd infer that the result is dependent on a) the respective parameter being present and b) the parameter being true.
Not sure what happens if you try to evaluate a non-present parameter or pass it on to another function. Couldn't you call a sub-function eight times to find out which parameter fulfills the condition and then pass back the return value?
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LEARN ABOUT SUSE
request_scroll
request_scroll(3alleg4) Allegro manual request_scroll(3alleg4)
NAME
request_scroll - Queues a hardware scroll request with triple buffering. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int request_scroll(int x, int y);
DESCRIPTION
This function is used for triple buffering. It requests a hardware scroll to the specified position, but returns immediately rather than
waiting for a retrace. The scroll will then take place during the next vertical retrace, but you can carry on running other code in the
meantime and use the poll_scroll() routine to detect when the flip has actually taken place.
Triple buffering is only possible with certain drivers: you can look at the GFX_CAN_TRIPLE_BUFFER bit in the gfx_capabilities flag to see
if it will work with the current driver.
RETURN VALUE
This function returns zero on success, non-zero otherwise.
SEE ALSO
poll_scroll(3alleg4), request_video_bitmap(3alleg4), gfx_capabilities(3alleg4), scroll_screen(3alleg4)
Allegro version 4.4.2 request_scroll(3alleg4)