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REQUEST_SCROLL(3ALLEG4) - Linux man page online | Library functions

Queues a hardware scroll request with triple buffering. Allegro game programming library.

Chapter
version 4.4.2
request_scroll(3alleg4) Allegro manual request_scroll(3alleg4)

NAME

request_scroll - Queues a hardware scroll request with triple buffering. Allegro game pro‐ gramming 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)
This manual Reference Other manuals
request_scroll(3alleg4) referred by enable_triple_buffer(3alleg4) | gfx_capabilities(3alleg4) | poll_scroll(3alleg4) | request_video_bitmap(3alleg4) | scroll_screen(3alleg4)
refer to gfx_capabilities(3alleg4) | poll_scroll(3alleg4) | request_video_bitmap(3alleg4) | scroll_screen(3alleg4)
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