/
ex_loading_thread.c
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/
ex_loading_thread.c
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "allegro5/allegro.h"
#include "allegro5/allegro_image.h"
#include "allegro5/allegro_font.h"
#include "allegro5/allegro_primitives.h"
#include "common.c"
static const int load_total = 100;
static int load_count = 0;
static ALLEGRO_BITMAP *bitmaps[100];
static ALLEGRO_MUTEX *mutex;
static void *loading_thread(ALLEGRO_THREAD *thread, void *arg)
{
ALLEGRO_FONT *font;
ALLEGRO_COLOR text;
font = al_load_font("data/fixed_font.tga", 0, 0);
text = al_map_rgb_f(255, 255, 255);
/* In this example we load mysha.pcx 100 times to simulate loading
* many bitmaps.
*/
load_count = 0;
while (load_count < load_total) {
ALLEGRO_COLOR color;
ALLEGRO_BITMAP *bmp;
color = al_map_rgb(rand() % 256, rand() % 256, rand() % 256);
color.r /= 4;
color.g /= 4;
color.b /= 4;
color.a /= 4;
if (al_get_thread_should_stop(thread))
break;
bmp = al_load_bitmap("data/mysha.pcx");
/* Simulate different contents. */
al_set_target_bitmap(bmp);
al_draw_filled_rectangle(0, 0, 320, 200, color);
al_draw_textf(font, text, 0, 0, 0, "bitmap %d", 1 + load_count);
al_set_target_bitmap(NULL);
/* Allow the main thread to see the completed bitmap. */
al_lock_mutex(mutex);
bitmaps[load_count] = bmp;
load_count++;
al_unlock_mutex(mutex);
/* Simulate that it's slow. */
al_rest(0.05);
}
al_destroy_font(font);
return arg;
}
static void print_bitmap_flags(ALLEGRO_BITMAP *bitmap)
{
ALLEGRO_USTR *ustr = al_ustr_new("");
if (al_get_bitmap_flags(bitmap) & ALLEGRO_VIDEO_BITMAP)
al_ustr_append_cstr(ustr, " VIDEO");
if (al_get_bitmap_flags(bitmap) & ALLEGRO_MEMORY_BITMAP)
al_ustr_append_cstr(ustr, " MEMORY");
if (al_get_bitmap_flags(bitmap) & ALLEGRO_CONVERT_BITMAP)
al_ustr_append_cstr(ustr, " CONVERT");
al_ustr_trim_ws(ustr);
al_ustr_find_replace_cstr(ustr, 0, " ", " | ");
log_printf("%s", al_cstr(ustr));
al_ustr_free(ustr);
}
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
bool redraw = true;
ALLEGRO_FONT *font;
ALLEGRO_BITMAP *spin, *spin2;
int current_bitmap = 0;
int loaded_bitmap = 0;
ALLEGRO_THREAD *thread;
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
al_init_image_addon();
al_init_font_addon();
al_init_primitives_addon();
init_platform_specific();
open_log();
al_install_mouse();
al_install_keyboard();
spin = al_load_bitmap("data/cursor.tga");
log_printf("default bitmap without display: %p\n", spin);
al_set_new_bitmap_flags(ALLEGRO_VIDEO_BITMAP);
spin2 = al_load_bitmap("data/cursor.tga");
log_printf("video bitmap without display: %p\n", spin2);
log_printf("%p before create_display: ", spin);
print_bitmap_flags(spin);
log_printf("\n");
display = al_create_display(64, 64);
if (!display) {
abort_example("Error creating display\n");
}
spin2 = al_load_bitmap("data/cursor.tga");
log_printf("video bitmap with display: %p\n", spin2);
log_printf("%p after create_display: ", spin);
print_bitmap_flags(spin);
log_printf("\n");
log_printf("%p after create_display: ", spin2);
print_bitmap_flags(spin2);
log_printf("\n");
al_destroy_display(display);
log_printf("%p after destroy_display: ", spin);
print_bitmap_flags(spin);
log_printf("\n");
log_printf("%p after destroy_display: ", spin2);
print_bitmap_flags(spin2);
log_printf("\n");
display = al_create_display(640, 480);
log_printf("%p after create_display: ", spin);
print_bitmap_flags(spin);
log_printf("\n");
log_printf("%p after create_display: ", spin2);
print_bitmap_flags(spin2);
log_printf("\n");
font = al_load_font("data/fixed_font.tga", 0, 0);
mutex = al_create_mutex();
thread = al_create_thread(loading_thread, NULL);
al_start_thread(thread);
timer = al_create_timer(1.0 / 30);
queue = al_create_event_queue();
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_display_event_source(display));
al_register_event_source(queue, al_get_timer_event_source(timer));
al_start_timer(timer);
while (1) {
ALLEGRO_EVENT event;
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
break;
if (event.type == ALLEGRO_EVENT_KEY_DOWN) {
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
break;
}
if (event.type == ALLEGRO_EVENT_TIMER)
redraw = true;
if (redraw && al_is_event_queue_empty(queue)) {
float x = 20, y = 320;
int i;
ALLEGRO_COLOR color = al_map_rgb_f(0, 0, 0);
float t = al_current_time();
redraw = false;
al_clear_to_color(al_map_rgb_f(0.5, 0.6, 1));
al_draw_textf(font, color, x + 40, y, 0, "Loading %d%%",
100 * load_count / load_total);
al_lock_mutex(mutex);
if (loaded_bitmap < load_count) {
/* This will convert any video bitmaps without a display
* (all the bitmaps being loaded in the loading_thread) to
* video bitmaps we can use in the main thread.
*/
al_convert_bitmap(bitmaps[loaded_bitmap]);
loaded_bitmap++;
}
al_unlock_mutex(mutex);
if (current_bitmap < loaded_bitmap) {
int bw;
al_draw_bitmap(bitmaps[current_bitmap], 0, 0, 0);
if (current_bitmap + 1 < loaded_bitmap)
current_bitmap++;
for (i = 0; i <= current_bitmap; i++) {
bw = al_get_bitmap_width(bitmaps[i]);
al_draw_scaled_rotated_bitmap(bitmaps[i],
0, 0, (i % 20) * 640 / 20, 360 + (i / 20) * 24,
32.0 / bw, 32.0 / bw, 0, 0);
}
}
if (loaded_bitmap < load_total) {
al_draw_scaled_rotated_bitmap(spin,
16, 16, x, y, 1.0, 1.0, t * ALLEGRO_PI * 2, 0);
}
al_flip_display();
}
}
al_join_thread(thread, NULL);
al_destroy_mutex(mutex);
al_destroy_font(font);
al_destroy_display(display);
close_log(true);
return 0;
}