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/*
* Example program for the Allegro library, by Peter Wang.
*/
#include <allegro5/allegro.h>
#include "allegro5/allegro_image.h"
#include <math.h>
#include "common.c"
int main(int argc, char **argv)
{
const int display_w = 640;
const int display_h = 480;
ALLEGRO_DISPLAY *dpy;
ALLEGRO_BITMAP *buf;
ALLEGRO_BITMAP *bmp;
ALLEGRO_BITMAP *mem_bmp;
ALLEGRO_BITMAP *src_bmp;
int bmp_w;
int bmp_h;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_EVENT event;
double theta = 0;
double k = 1.0;
int mode = 0;
bool wide_mode = false;
bool mem_src_mode = false;
bool trans_mode = false;
int flags = 0;
bool clip_mode = false;
ALLEGRO_COLOR tint;
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
al_install_keyboard();
al_init_image_addon();
init_platform_specific();
open_log();
log_printf("Press 'w' to toggle wide mode.\n");
log_printf("Press 's' to toggle memory source bitmap.\n");
log_printf("Press space to toggle drawing to backbuffer or off-screen bitmap.\n");
log_printf("Press 't' to toggle translucency.\n");
log_printf("Press 'h' to toggle horizontal flipping.\n");
log_printf("Press 'v' to toggle vertical flipping.\n");
log_printf("Press 'c' to toggle clipping.\n");
log_printf("\n");
dpy = al_create_display(display_w, display_h);
if (!dpy) {
abort_example("Unable to set any graphic mode\n");
}
buf = al_create_bitmap(display_w, display_h);
if (!buf) {
abort_example("Unable to create buffer\n\n");
}
bmp = al_load_bitmap("data/mysha.pcx");
if (!bmp) {
abort_example("Unable to load image\n");
}
al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
mem_bmp = al_load_bitmap("data/mysha.pcx");
if (!mem_bmp) {
abort_example("Unable to load image\n");
}
bmp_w = al_get_bitmap_width(bmp);
bmp_h = al_get_bitmap_height(bmp);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_keyboard_event_source());
while (true) {
if (al_get_next_event(queue, &event)) {
if (event.type == ALLEGRO_EVENT_KEY_CHAR) {
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
break;
if (event.keyboard.unichar == ' ') {
mode = !mode;
if (mode == 0)
log_printf("Drawing to off-screen buffer\n");
else
log_printf("Drawing to display backbuffer\n");
}
if (event.keyboard.unichar == 'w')
wide_mode = !wide_mode;
if (event.keyboard.unichar == 's') {
mem_src_mode = !mem_src_mode;
if (mem_src_mode)
log_printf("Source is memory bitmap\n");
else
log_printf("Source is display bitmap\n");
}
if (event.keyboard.unichar == 't')
trans_mode = !trans_mode;
if (event.keyboard.unichar == 'h')
flags ^= ALLEGRO_FLIP_HORIZONTAL;
if (event.keyboard.unichar == 'v')
flags ^= ALLEGRO_FLIP_VERTICAL;
if (event.keyboard.unichar == 'c')
clip_mode = !clip_mode;
}
}
/*
* mode 0 = draw scaled to off-screen buffer before
* blitting to display backbuffer
* mode 1 = draw scaled to display backbuffer
*/
if (mode == 0) {
al_set_target_bitmap(buf);
}
else {
al_set_target_backbuffer(dpy);
}
src_bmp = (mem_src_mode) ? mem_bmp : bmp;
k = (wide_mode) ? 2.0 : 1.0;
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO);
tint = al_map_rgba_f(1, 1, 1, 1);
if (mode == 0)
al_clear_to_color(al_map_rgba_f(1, 0, 0, 1));
else
al_clear_to_color(al_map_rgba_f(0, 0, 1, 1));
if (trans_mode) {
al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
tint = al_map_rgba_f(1, 1, 1, 0.5);
}
if (clip_mode) {
al_set_clipping_rectangle(50, 50, display_w - 100, display_h - 100);
}
else {
al_set_clipping_rectangle(0, 0, display_w, display_h);
}
al_draw_tinted_scaled_bitmap(src_bmp, tint,
0, 0, bmp_w, bmp_h,
display_w/2, display_h/2,
k * cos(theta) * display_w/2, k * sin(theta) * display_h/2,
flags);
if (mode == 0) {
al_set_target_backbuffer(dpy);
al_set_clipping_rectangle(0, 0, display_w, display_h);
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO);
al_draw_bitmap(buf, 0, 0, 0);
}
al_flip_display();
al_rest(0.01);
theta += 0.01;
}
al_destroy_bitmap(bmp);
al_destroy_bitmap(mem_bmp);
al_destroy_bitmap(buf);
close_log(false);
return 0;
}
/* vim: set sts=3 sw=3 et: */
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