1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
#include "allegro5/allegro.h"
#include "allegro5/allegro_image.h"
#include <allegro5/allegro_primitives.h>
#include <stdlib.h>
#include "common.c"
#define NUM_RESOLUTIONS 4
static struct {
int w, h;
} res[NUM_RESOLUTIONS] = {
{ 640, 480 },
{ 800, 600 },
{ 1024, 768 },
{ 1280, 1024 }
};
static int cur_res = 0;
static void redraw(ALLEGRO_BITMAP *picture)
{
ALLEGRO_COLOR color;
ALLEGRO_BITMAP *target = al_get_target_bitmap();
int w = al_get_bitmap_width(target);
int h = al_get_bitmap_height(target);
color = al_map_rgb(
128 + rand() % 128,
128 + rand() % 128,
128 + rand() % 128);
al_clear_to_color(color);
color = al_map_rgb(255, 0, 0);
al_draw_line(0, 0, w, h, color, 0);
al_draw_line(0, h, w, 0, color, 0);
al_draw_bitmap(picture, 0, 0, 0);
al_flip_display();
}
static void main_loop(ALLEGRO_DISPLAY *display, ALLEGRO_BITMAP *picture)
{
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_EVENT event;
bool can_draw;
int new_res;
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));
can_draw = true;
while (1) {
if (al_is_event_queue_empty(queue) && can_draw) {
redraw(picture);
}
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_DISPLAY_LOST) {
log_printf("Display lost\n");
can_draw = false;
continue;
}
if (event.type == ALLEGRO_EVENT_DISPLAY_FOUND) {
log_printf("Display found\n");
can_draw = true;
continue;
}
if (event.type != ALLEGRO_EVENT_KEY_CHAR) {
continue;
}
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
break;
}
new_res = cur_res;
if (event.keyboard.unichar == '+' ||
event.keyboard.unichar == ' ' ||
event.keyboard.keycode == ALLEGRO_KEY_ENTER) {
new_res++;
if (new_res >= NUM_RESOLUTIONS)
new_res = 0;
}
else if (event.keyboard.unichar == '-') {
new_res--;
if (new_res < 0)
new_res = NUM_RESOLUTIONS - 1;
}
if (new_res != cur_res) {
cur_res = new_res;
log_printf("Switching to %dx%d... ", res[cur_res].w, res[cur_res].h);
if (al_resize_display(display, res[cur_res].w, res[cur_res].h)) {
log_printf("Succeeded.\n");
}
else {
log_printf("Failed. current resolution: %dx%d\n",
al_get_display_width(display), al_get_display_height(display));
}
}
}
al_destroy_event_queue(queue);
}
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_BITMAP *picture;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
al_init_primitives_addon();
al_install_keyboard();
al_init_image_addon();
init_platform_specific();
open_log_monospace();
if (argc == 2) {
al_set_new_display_adapter(atoi(argv[1]));
}
al_set_new_display_flags(ALLEGRO_FULLSCREEN |
ALLEGRO_GENERATE_EXPOSE_EVENTS);
display = al_create_display(res[cur_res].w, res[cur_res].h);
if (!display) {
abort_example("Error creating display\n");
}
picture = al_load_bitmap("data/mysha.pcx");
if (!picture) {
abort_example("mysha.pcx not found\n");
}
main_loop(display, picture);
al_destroy_bitmap(picture);
/* Destroying the fullscreen display restores the original screen
* resolution. Shutting down Allegro would automatically destroy the
* display, too.
*/
al_destroy_display(display);
return 0;
}
|
