exupdate(3alleg4)                Allegro manual                exupdate(3alleg4)

       exupdate - Supporting different screen update methods in a single
       program. Allegro game programming library.

       #include <allegro.h>

       Example exupdate

       This program demonstrates how to support double buffering, page flipping,
       and triple buffering as options within a single program, and how to make
       things run at a constant rate no matter what the speed of your computer.
       You have to use this example from the command line to specify as first
       parameter a number which represents the type of video update you want: 1
       for double buffering with memory bitmaps, 2 for page flipping, 3 for
       triple buffering and 4 for double buffering with system bitmaps. After
       this, a dialog allows you to select a screen resolution and finally you
       will see a kaleidoscopic animation, along with a frames per second
       counter on the top left of the screen.

       BITMAP(3alleg4), END_OF_FUNCTION(3alleg4), END_OF_MAIN(3alleg4),
       LOCK_FUNCTION(3alleg4), LOCK_VARIABLE(3alleg4), PALETTE(3alleg4),
       SCREEN_H(3alleg4), SCREEN_W(3alleg4), acquire_bitmap(3alleg4),
       allegro_error(3alleg4), allegro_init(3alleg4), allegro_message(3alleg4),
       bitmap_color_depth(3alleg4), blit(3alleg4), clear_bitmap(3alleg4),
       create_bitmap(3alleg4), create_system_bitmap(3alleg4),
       create_video_bitmap(3alleg4), desktop_palette(3alleg4),
       destroy_bitmap(3alleg4), enable_triple_buffer(3alleg4), fixcos(3alleg4),
       fixed(3alleg4), fixmul(3alleg4), fixsin(3alleg4), fixtoi(3alleg4),
       font(3alleg4), ftofix(3alleg4), generate_332_palette(3alleg4),
       gfx_capabilities(3alleg4), gfx_mode_select_ex(3alleg4),
       install_int_ex(3alleg4), install_keyboard(3alleg4),
       install_mouse(3alleg4), install_timer(3alleg4), keypressed(3alleg4),
       line(3alleg4), makecol(3alleg4), poll_scroll(3alleg4),
       release_bitmap(3alleg4), request_video_bitmap(3alleg4), screen(3alleg4),
       set_color_depth(3alleg4), set_gfx_mode(3alleg4), set_palette(3alleg4),
       show_video_bitmap(3alleg4), textout_ex(3alleg4), textprintf_ex(3alleg4),
       triangle(3alleg4), vsync(3alleg4), xor_mode(3alleg4)

Allegro                           version 4.4.3                exupdate(3alleg4)