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/* Tests vsync.
*/
#include <stdio.h>
#include "allegro5/allegro.h"
#include "allegro5/allegro_font.h"
#include "allegro5/allegro_image.h"
#include "allegro5/allegro_primitives.h"
#include "common.c"
int vsync, fullscreen, frequency, bar_width;
static int option(ALLEGRO_CONFIG *config, char *name, int v)
{
char const *value;
char str[256];
value = al_get_config_value(config, "settings", name);
if (value)
v = strtol(value, NULL, 0);
sprintf(str, "%d", v);
al_set_config_value(config, "settings", name, str);
return v;
}
static bool display_warning(ALLEGRO_EVENT_QUEUE *queue, ALLEGRO_FONT *font)
{
ALLEGRO_EVENT event;
ALLEGRO_DISPLAY *display = al_get_current_display();
float x = al_get_display_width(display) / 2.0;
float h = al_get_font_line_height(font);
ALLEGRO_COLOR white = al_map_rgb_f(1, 1, 1);
for (;;) {
// Convert from 200 px on 480px high screen to same relative position
// gtiven actual display height.
float y = 5/12.0 * al_get_display_height(display);
al_clear_to_color(al_map_rgb(0, 0, 0));
al_draw_text(font, white, x, y, ALLEGRO_ALIGN_CENTRE,
"Do not continue if you suffer from photosensitive epilepsy");
al_draw_text(font, white, x, y + 15, ALLEGRO_ALIGN_CENTRE,
"or simply hate sliding bars.");
al_draw_text(font, white, x, y + 40, ALLEGRO_ALIGN_CENTRE,
"Press Escape to quit or Enter to continue.");
y += 100;
al_draw_text(font, white, x, y, ALLEGRO_ALIGN_CENTRE, "Parameters from ex_vsync.ini:");
y += h;
al_draw_textf(font, white, x, y, ALLEGRO_ALIGN_CENTRE, "vsync: %d", vsync);
y += h;
al_draw_textf(font, white, x, y, ALLEGRO_ALIGN_CENTRE, "fullscreen: %d", fullscreen);
y += h;
al_draw_textf(font, white, x, y, ALLEGRO_ALIGN_CENTRE, "frequency: %d", frequency);
y += h;
al_draw_textf(font, white, x, y, ALLEGRO_ALIGN_CENTRE, "bar width: %d", bar_width);
al_flip_display();
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_KEY_DOWN) {
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
return true;
}
if (event.keyboard.keycode == ALLEGRO_KEY_ENTER) {
return false;
}
}
if (event.type == ALLEGRO_EVENT_DISPLAY_CLOSE) {
return true;
}
}
}
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_FONT *font;
ALLEGRO_CONFIG *config;
ALLEGRO_EVENT_QUEUE *queue;
bool write = false;
bool quit;
bool right = true;
int bar_position = 0;
int step_size = 3;
int display_width;
int display_height;
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
al_init_font_addon();
al_init_primitives_addon();
al_init_image_addon();
al_install_keyboard();
al_install_mouse();
/* Read parameters from ex_vsync.ini. */
config = al_load_config_file("ex_vsync.ini");
if (!config) {
config = al_create_config();
write = true;
}
/* 0 -> Driver chooses.
* 1 -> Force vsync on.
* 2 -> Force vsync off.
*/
vsync = option(config, "vsync", 0);
fullscreen = option(config, "fullscreen", 0);
frequency = option(config, "frequency", 0);
bar_width = option(config, "bar_width", 10);
/* Write the file back (so a template is generated on first run). */
if (write) {
al_save_config_file("ex_vsync.ini", config);
}
al_destroy_config(config);
/* Vsync 1 means force on, 2 means forced off. */
if (vsync)
al_set_new_display_option(ALLEGRO_VSYNC, vsync, ALLEGRO_SUGGEST);
/* Force fullscreen mode. */
if (fullscreen) {
al_set_new_display_flags(ALLEGRO_FULLSCREEN_WINDOW);
/* Set a monitor frequency. */
if (frequency)
al_set_new_display_refresh_rate(frequency);
}
display = al_create_display(640, 480);
if (!display) {
abort_example("Error creating display.\n");
}
font = al_load_font("data/a4_font.tga", 0, 0);
if (!font) {
abort_example("Failed to load a4_font.tga\n");
}
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_display_event_source(display));
quit = display_warning(queue, font);
al_flush_event_queue(queue);
display_width = al_get_display_width(display);
display_height = al_get_display_height(display);
while (!quit) {
ALLEGRO_EVENT event;
/* With vsync, this will appear as a bar moving smoothly left to right.
* Without vsync, it will appear that there are many bars moving left to right.
* More importantly, if you view it in fullscreen, the slanting of the bar will
* appear more exaggerated as it is now much taller.
*/
if (right) {
bar_position += step_size;
}
else {
bar_position -= step_size;
}
if (right && bar_position >= display_width - bar_width) {
bar_position = display_width - bar_width;
right = false;
}
else if (!right && bar_position <= 0) {
bar_position = 0;
right = true;
}
al_clear_to_color(al_map_rgb(0,0,0));
al_draw_filled_rectangle(bar_position, 0, bar_position + bar_width - 1, display_height - 1, al_map_rgb_f(1., 1., 1.));
al_flip_display();
while (al_get_next_event(queue, &event)) {
switch (event.type) {
case ALLEGRO_EVENT_DISPLAY_CLOSE:
quit = true;
break;
case ALLEGRO_EVENT_KEY_DOWN:
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
quit = true;
}
}
/* Let's not go overboard and limit flipping at 1000 Hz. Without
* this my system locks up and requires a hard reboot :P
*/
/*
* Limiting this to 500hz so the bar doesn't move too fast. We're
* no longer in epilepsy mode (I hope).
*/
al_rest(.002);
}
al_destroy_font(font);
al_destroy_event_queue(queue);
return 0;
}
/* vim: set sts=3 sw=3 et: */
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