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/*
* Example program for the Allegro library, by Grzegorz Ludorowski.
*
* This example demonstrates how to use datafiles, various sprite drawing
* routines and flicker-free animation.
*
* A short explanation for beginners.
* Why did I do animate () routine in that way?
* As you probably know, VIDEO RAM is much slower than "normal" RAM, so
* it's advisable to reduce VRAM blits to a minimum.
* So, drawing sprite on the screen (I mean in VRAM) and then clearing
* a background for him is not very fast. I've used a different method
* which is much faster, but require a bit more memory.
* I clear a buffer (it's a normal BITMAP), then I draw sprite to it, and
* after all I blit only one time this buffer to the screen. So, I'm using
* a single VRAM blit instead of blitting/clearing background and drawing
* a sprite on it. It's a good method even when I have to restore.
* background And of course, it completely remove flickering effect.
* When one uses a big (ie. 800x600 background) and draws something on
* it, it's wise to use a copy of background somewhere in memory and
* restore background using this "virtual background". When blitting from
* VRAM in SVGA modes, it's probably, that drawing routines have to switch
* banks on video card. I think, I don't have to remind how slow is it.
*/
#include "allegro.h"
#include "running.h"
/* pointer to data file */
DATAFILE *running_data;
/* current sprite frame number */
int frame_number = 0;
/* pointer to a sprite buffer, where sprite will be drawn */
BITMAP *sprite_buffer;
/* a boolean - if true, skip to next part */
int next;
void animate(void)
{
/* waits for vertical retrace interrupt */
vsync();
vsync();
/* blits sprite buffer to screen */
blit(sprite_buffer, screen, 0, 0, 120, 80, 82, 82);
/* clears sprite buffer with color 0 */
clear_bitmap(sprite_buffer);
/* if SPACE key pressed set a next flag */
if (keypressed())
next = TRUE;
else
next = FALSE;
/* increase frame number, or if it's equal 9 (last frame) set it to 0 */
if (frame_number == 9)
frame_number = 0;
else
frame_number++;
}
int main(int argc, char *argv[])
{
BITMAP *running;
char datafile_name[256];
int angle = 0;
allegro_init();
install_keyboard();
if (set_gfx_mode(GFX_SAFE, 320, 200, 0, 0) != 0) {
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to set any graphic mode\n%s\n", allegro_error);
return 1;
}
/* we still don't have a palette, don't let Allegro twist colors */
set_color_conversion(COLORCONV_NONE);
/* loads datafile and sets user palette saved in datafile */
replace_filename(datafile_name, argv[0], "running.dat", sizeof(datafile_name));
running_data = load_datafile(datafile_name);
if (!running_data) {
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Error loading %s!\n", datafile_name);
return 1;
}
/* select the palette which was loaded from the datafile */
set_palette(running_data[PALETTE_001].dat);
/* aha, set a palette and let Allegro convert colors when blitting */
set_color_conversion(COLORCONV_TOTAL);
/* create and clear a bitmap for sprite buffering */
sprite_buffer = create_bitmap(82, 82);
clear_bitmap(sprite_buffer);
/* create another bitmap for color conversion from the datafile */
running = create_bitmap(82, 82);
/* write current sprite drawing method */
textout(screen, font, "Press a key for next part...", 40, 10, palette_color[1]);
textout(screen, font, "Using draw_sprite", 1, 190, palette_color[15]);
do {
blit(running_data[frame_number].dat, running, 0, 0, 0, 0, 82, 82);
draw_sprite(sprite_buffer, running, 0, 0);
animate();
} while (!next);
clear_keybuf();
rectfill(screen, 0, 190, 320, 200, 0);
textout(screen, font, "Using draw_sprite_h_flip", 1, 190, palette_color[15]);
do {
blit(running_data[frame_number].dat, running, 0, 0, 0, 0, 82, 82);
draw_sprite_h_flip(sprite_buffer, running, 0, 0);
animate();
} while (!next);
clear_keybuf();
rectfill(screen, 0, 190, 320, 200, 0);
textout(screen, font, "Using draw_sprite_v_flip", 1, 190, palette_color[15]);
do {
blit(running_data[frame_number].dat, running, 0, 0, 0, 0, 82, 82);
draw_sprite_v_flip(sprite_buffer, running, 0, 0);
animate();
} while (!next);
clear_keybuf();
rectfill(screen, 0, 190, 320, 200, 0);
textout(screen, font, "Using draw_sprite_vh_flip", 1, 190, palette_color[15]);
do {
blit(running_data[frame_number].dat, running, 0, 0, 0, 0, 82, 82);
draw_sprite_vh_flip(sprite_buffer, running, 0, 0);
animate();
} while (!next);
clear_keybuf();
rectfill(screen, 0, 190, 320, 200, 0);
textout(screen, font, "Now with rotating - rotate_sprite", 1, 190, palette_color[15]);
do {
/* The last argument to rotate_sprite() is a fixed point type,
* so I had to use itofix() routine (integer to fixed).
*/
blit(running_data[frame_number].dat, running, 0, 0, 0, 0, 82, 82);
rotate_sprite(sprite_buffer, running, 0, 0, itofix(angle));
animate();
angle += 4;
} while (!next);
clear_keybuf();
rectfill(screen, 0, 190, 320, 200, 0);
textout(screen, font, "Now using rotate_sprite_v_flip", 1, 190, palette_color[15]);
do {
/* The last argument to rotate_sprite_v_flip() is a fixed point type,
* so I had to use itofix() routine (integer to fixed).
*/
blit(running_data[frame_number].dat, running, 0, 0, 0, 0, 82, 82);
rotate_sprite_v_flip(sprite_buffer, running, 0, 0, itofix(angle));
animate();
angle += 4;
} while (!next);
unload_datafile(running_data);
destroy_bitmap(sprite_buffer);
destroy_bitmap(running);
return 0;
}
END_OF_MAIN();
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