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#include <allegro5/allegro.h>
#include <allegro5/allegro_image.h>
#include <allegro5/allegro_font.h>
#include <stdlib.h>
#include <math.h>
#include "common.c"
#define FPS 60
static struct Example {
ALLEGRO_DISPLAY *display;
ALLEGRO_FONT *font;
ALLEGRO_BITMAP *bitmaps[2][9];
ALLEGRO_COLOR bg, fg, info;
int bitmap;
int ticks;
} example;
static int const filter_flags[6] = {
0,
ALLEGRO_MIN_LINEAR,
ALLEGRO_MIPMAP,
ALLEGRO_MIN_LINEAR | ALLEGRO_MIPMAP,
0,
ALLEGRO_MAG_LINEAR
};
static char const *filter_text[4] = {
"nearest", "linear",
"nearest mipmap", "linear mipmap"
};
static void update(void)
{
example.ticks++;
}
static void redraw(void)
{
int w = al_get_display_width(example.display);
int h = al_get_display_height(example.display);
int i;
al_clear_to_color(example.bg);
for (i = 0; i < 6; i++) {
float x = (i / 2) * w / 3 + w / 6;
float y = (i % 2) * h / 2 + h / 4;
ALLEGRO_BITMAP *bmp = example.bitmaps[example.bitmap][i];
float bw = al_get_bitmap_width(bmp);
float bh = al_get_bitmap_height(bmp);
float t = 1 - 2 * fabs((example.ticks % (FPS * 16)) / 16.0 / FPS - 0.5);
float scale;
float angle = example.ticks * ALLEGRO_PI * 2 / FPS / 8;
if (i < 4)
scale = 1 - t * 0.9;
else
scale = 1 + t * 9;
al_draw_textf(example.font, example.fg, x, y - 64 - 14,
ALLEGRO_ALIGN_CENTRE, "%s", filter_text[i % 4]);
al_set_clipping_rectangle(x - 64, y - 64, 128, 128);
al_draw_scaled_rotated_bitmap(bmp, bw / 2, bh / 2,
x, y, scale, scale, angle, 0);
al_set_clipping_rectangle(0, 0, w, h);
}
al_draw_textf(example.font, example.info, w / 2, h - 14,
ALLEGRO_ALIGN_CENTRE, "press space to change");
}
int main(int argc, char **argv)
{
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
int w = 640, h = 480;
bool done = false;
bool need_redraw = true;
int i;
ALLEGRO_BITMAP *mysha;
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Failed to init Allegro.\n");
}
if (!al_init_image_addon()) {
abort_example("Failed to init IIO addon.\n");
}
al_init_font_addon();
init_platform_specific();
example.display = al_create_display(w, h);
if (!example.display) {
abort_example("Error creating display.\n");
}
if (!al_install_keyboard()) {
abort_example("Error installing keyboard.\n");
}
if (!al_install_mouse()) {
abort_example("Error installing mouse.\n");
}
example.font = al_load_font("data/fixed_font.tga", 0, 0);
if (!example.font) {
abort_example("Error loading data/fixed_font.tga\n");
}
mysha = al_load_bitmap("data/mysha256x256.png");
if (!mysha) {
abort_example("Error loading data/mysha256x256.png\n");
}
for (i = 0; i < 6; i++) {
ALLEGRO_LOCKED_REGION *lock;
int x, y;
/* Only power-of-two bitmaps can have mipmaps. */
al_set_new_bitmap_flags(filter_flags[i]);
example.bitmaps[0][i] = al_create_bitmap(1024, 1024);
example.bitmaps[1][i] = al_clone_bitmap(mysha);
lock = al_lock_bitmap(example.bitmaps[0][i],
ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE, ALLEGRO_LOCK_WRITEONLY);
for (y = 0; y < 1024; y++) {
unsigned char *row = (unsigned char *)lock->data + lock->pitch * y;
unsigned char *ptr = row;
for (x = 0; x < 1024; x++) {
int c = 0;
if (((x >> 2) & 1) ^ ((y >> 2) & 1)) c = 255;
*(ptr++) = c;
*(ptr++) = c;
*(ptr++) = c;
*(ptr++) = 255;
}
}
al_unlock_bitmap(example.bitmaps[0][i]);
}
example.bg = al_map_rgb_f(0, 0, 0);
example.fg = al_map_rgb_f(1, 1, 1);
example.info = al_map_rgb_f(0.5, 0.5, 1);
timer = al_create_timer(1.0 / FPS);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_mouse_event_source());
al_register_event_source(queue, al_get_timer_event_source(timer));
al_register_event_source(queue, al_get_display_event_source(example.display));
al_start_timer(timer);
while (!done) {
ALLEGRO_EVENT event;
if (need_redraw && al_is_event_queue_empty(queue)) {
redraw();
al_flip_display();
need_redraw = false;
}
al_wait_for_event(queue, &event);
switch (event.type) {
case ALLEGRO_EVENT_KEY_DOWN:
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
done = true;
if (event.keyboard.keycode == ALLEGRO_KEY_SPACE)
example.bitmap = (example.bitmap + 1) % 2;
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
done = true;
break;
case ALLEGRO_EVENT_TIMER:
update();
need_redraw = true;
break;
case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
example.bitmap = (example.bitmap + 1) % 2;
break;
}
}
for (i = 0; i < 6; i++) {
al_destroy_bitmap(example.bitmaps[0][i]);
al_destroy_bitmap(example.bitmaps[1][i]);
}
return 0;
}
/* vim: set sts=3 sw=3 et: */
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