request_video_bitmap - Online Linux Manual PageSection : 3
Updated : version 4.4.3
Source : Allegro
Note : Allegro manual

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NAMErequest_video_bitmap − Triple buffering page flip request. Allegro game programming library.​

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SYNOPSIS#include <allegro.h> int request_video_bitmap(BITMAP *bitmap);

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DESCRIPTIONThis function is used for triple buffering. It requests a page flip to display the specified video bitmap object, but returns immediately rather than waiting for a retrace. The flip 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 on certain hardware: see the comments about request_scroll(). Example: int current_page; BITMAP *video_page[3]; ... /* Create pages for page flipping */ video_page[0] = create_video_bitmap(SCREEN_W, SCREEN_H); video_page[1] = create_video_bitmap(SCREEN_W, SCREEN_H); video_page[2] = create_video_bitmap(SCREEN_W, SCREEN_H); current_page = 0; ... /* draw the screen and flip pages */ draw_screen(video_page[current_page]); do { } while (poll_scroll()); request_video_bitmap(video_page[current_page]); current_page = (current_page+1)%3; ...

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RETURN VALUEReturns zero on success and non-zero on failure.

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SEE ALSOpoll_scroll(3), request_scroll(3), gfx_capabilities(3), create_video_bitmap(3), scroll_screen(3), ex3buf(3), exupdate(3) 0

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