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keyboard_lowlevel_callback(3alleg4) [suse man page]

keyboard_lowlevel_callback(3alleg4)                               Allegro manual                               keyboard_lowlevel_callback(3alleg4)

NAME

       keyboard_lowlevel_callback - User specified low level keyboard event handler. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       extern void (*keyboard_lowlevel_callback)(int scancode);

DESCRIPTION

       If  set, this function is called by the keyboard handler in response to every keyboard event, both presses (including keyboard repeat rate)
       and releases. It will be passed a raw keyboard scancode byte (scancodes are 7 bits long), with the top bit (8th bit) clear if the  key  has
       been pressed or set if it was released. This routine executes in an interrupt context, so it must be in locked memory. Example:

          volatile int key_down, key_up;

          void keypress_watcher(int scancode)
          {
             if (scancode & 0x80) {
                key_up = 1;
             } else {
                key_down = 1;
             }
          } END_OF_FUNCTION(keypress_watcher)

          ...

             install_timer();
             LOCK_FUNCTION(silence_g_key);
             LOCK_VARIABLE(key_down);
             LOCK_VARIABLE(key_up);
             install_keyboard();
             keyboard_lowlevel_callback = keypress_watcher;
             /* Disable keyboard repeat to get typewriter effect. */
             set_keyboard_rate(0, 0);

          ...

             while (game_loop) {
                if (key_down) {
                   key_down = 0;
                   /* Play sample of typewriter key press. */
                }
                if (key_up) {
                   key_up = 0;
                   /* Play sample of typewriter key release. */
                }
             }

SEE ALSO

       install_keyboard(3alleg4), keyboard_callback(3alleg4), keyboard_ucallback(3alleg4), exkeys(3alleg4)

Allegro                                                            version 4.4.2                               keyboard_lowlevel_callback(3alleg4)

Check Out this Related Man Page

exzbuf(3alleg4) 						  Allegro manual						   exzbuf(3alleg4)

NAME

       exzbuf - Z-buffered polygons demo. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       Example exzbuf

DESCRIPTION

       This  program demonstrates how to use Z-buffered polygons and floating point 3D math routines. It also provides a simple way to compute fps
       (frames per second) using a timer. After selecting a screen resolution through the standard GUI dialog, the  example  shows  two  3D  cubes
       rotating  and intersecting each other. Rather than having full polygons incorrectly overlap other polygons due to per-polygon sorting, each
       pixel is drawn at the correct depth.

SEE ALSO

       BITMAP(3alleg4), END_OF_FUNCTION(3alleg4), END_OF_MAIN(3alleg4), LOCK_FUNCTION(3alleg4),  LOCK_VARIABLE(3alleg4),  MATRIX_f(3alleg4),  PAL-
       ETTE(3alleg4),  POLYTYPE_GCOL(3alleg4),	SCREEN_H(3alleg4),  SCREEN_W(3alleg4),	V3D_f(3alleg4),  ZBUFFER(3alleg4), allegro_error(3alleg4),
       allegro_exit(3alleg4),	 allegro_init(3alleg4),    allegro_message(3alleg4),	 apply_matrix_f(3alleg4),     bitmap_color_depth(3alleg4),
       blit(3alleg4),  clear_bitmap(3alleg4),  clear_zbuffer(3alleg4),	create_bitmap(3alleg4), create_zbuffer(3alleg4), desktop_palette(3alleg4),
       destroy_bitmap(3alleg4),  destroy_zbuffer(3alleg4),   font(3alleg4),   get_transformation_matrix_f(3alleg4),   gfx_mode_select_ex(3alleg4),
       install_int(3alleg4),	 install_keyboard(3alleg4),	install_mouse(3alleg4),    install_timer(3alleg4),    keypressed(3alleg4),    pal-
       ette_color(3alleg4),   persp_project_f(3alleg4),   polygon_z_normal_f(3alleg4),	 quad3d_f(3alleg4),   readkey(3alleg4),   screen(3alleg4),
       set_color_depth(3alleg4),   set_gfx_mode(3alleg4),   set_palette(3alleg4),   set_palette_range(3alleg4),  set_projection_viewport(3alleg4),
       set_zbuffer(3alleg4), textprintf_ex(3alleg4), vsync(3alleg4)

Allegro 							   version 4.4.2						   exzbuf(3alleg4)
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