poll_scroll(3alleg4) Allegro manual poll_scroll(3alleg4)NAME
poll_scroll - Checks the status of a scroll request with triple buffering. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int poll_scroll();
DESCRIPTION
This function is used for triple buffering. It checks the status of a hardware scroll previously initiated by the request_scroll() routine.
RETURN VALUE
Returns non-zero if it is still waiting to take place, and zero if the requested scroll has already happened.
SEE ALSO request_scroll(3alleg4), request_video_bitmap(3alleg4), ex3buf(3alleg4), exupdate(3alleg4)Allegro version 4.4.2 poll_scroll(3alleg4)
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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)
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