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ex_draw.c
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ex_draw.c
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/* Tests some drawing primitives.
*/
#include <allegro5/allegro.h>
#include <allegro5/allegro_image.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_color.h>
#include <allegro5/allegro_primitives.h>
#include <stdio.h>
#include <stdarg.h>
#include "common.c"
struct Example
{
ALLEGRO_FONT *font;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_COLOR background, text, white, foreground;
ALLEGRO_COLOR outline;
ALLEGRO_BITMAP *pattern;
ALLEGRO_BITMAP *zoom;
double timer[4], counter[4];
int FPS;
float text_x, text_y;
bool software;
int samples;
int what;
int thickness;
} ex;
char const *names[] = {
"filled rectangles",
"rectangles",
"filled circles",
"circles",
"lines"
};
static void draw_pattern(ALLEGRO_BITMAP *b)
{
int w = al_get_bitmap_width(b);
int h = al_get_bitmap_height(b);
int x, y;
int format = ALLEGRO_PIXEL_FORMAT_BGR_888;
ALLEGRO_COLOR light = al_map_rgb_f(1, 1, 1);
ALLEGRO_COLOR dark = al_map_rgb_f(1, 0.9, 0.8);
ALLEGRO_LOCKED_REGION *lock;
lock = al_lock_bitmap(b, format, ALLEGRO_LOCK_WRITEONLY);
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
ALLEGRO_COLOR c = (x + y) & 1 ? light : dark;
unsigned char r, g, b;
unsigned char *data = lock->data;
al_unmap_rgb(c, &r, &g, &b);
data += y * lock->pitch;
data += x * 3;
data[0] = r;
data[1] = g;
data[2] = b;
}
}
al_unlock_bitmap(b);
}
static void set_xy(float x, float y)
{
ex.text_x = x;
ex.text_y = y;
}
static void print(char const *format, ...)
{
va_list list;
char message[1024];
ALLEGRO_STATE state;
int th = al_get_font_line_height(ex.font);
al_store_state(&state, ALLEGRO_STATE_BLENDER);
va_start(list, format);
vsnprintf(message, sizeof message, format, list);
va_end(list);
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_INVERSE_ALPHA);
al_draw_textf(ex.font, ex.text, ex.text_x, ex.text_y, 0, "%s", message);
al_restore_state(&state);
ex.text_y += th;
}
static void primitive(float l, float t, float r, float b,
ALLEGRO_COLOR color, bool never_fill)
{
float cx = (l + r) / 2;
float cy = (t + b) / 2;
float rx = (r - l) / 2;
float ry = (b - t) / 2;
int tk = never_fill ? 0 : ex.thickness;
int w = ex.what;
if (w == 0 && never_fill) w = 1;
if (w == 2 && never_fill) w = 3;
if (w == 0) al_draw_filled_rectangle(l, t, r, b, color);
if (w == 1) al_draw_rectangle(l, t, r, b, color, tk);
if (w == 2) al_draw_filled_ellipse(cx, cy, rx, ry, color);
if (w == 3) al_draw_ellipse(cx, cy, rx, ry, color, tk);
if (w == 4) al_draw_line(l, t, r, b, color, tk);
}
static void draw(void)
{
float x, y;
int cx, cy, cw, ch;
int w = al_get_bitmap_width(ex.zoom);
int h = al_get_bitmap_height(ex.zoom);
ALLEGRO_BITMAP *screen = al_get_target_bitmap();
ALLEGRO_BITMAP *mem;
int rects_num = 16, i, j;
float rects[16 * 4];
for (j = 0; j < 4; j++) {
for (i = 0; i < 4; i++) {
rects[(j * 4 + i) * 4 + 0] = 2 + i * 0.25 + i * 7;
rects[(j * 4 + i) * 4 + 1] = 2 + j * 0.25 + j * 7;
rects[(j * 4 + i) * 4 + 2] = 2 + i * 0.25 + i * 7 + 5;
rects[(j * 4 + i) * 4 + 3] = 2 + j * 0.25 + j * 7 + 5;
}
}
al_get_clipping_rectangle(&cx, &cy, &cw, &ch);
al_clear_to_color(ex.background);
set_xy(8, 0);
print("Drawing %s (press SPACE to change)", names[ex.what]);
set_xy(8, 16);
print("Original");
set_xy(80, 16);
print("Enlarged x 16");
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO);
if (ex.software) {
al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
al_set_new_bitmap_format(al_get_bitmap_format(al_get_target_bitmap()));
mem = al_create_bitmap(w, h);
al_set_target_bitmap(mem);
x = 0;
y = 0;
}
else {
mem = NULL;
x = 8;
y = 40;
}
al_draw_bitmap(ex.pattern, x, y, 0);
/* Draw the test scene. */
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_INVERSE_ALPHA);
for (i = 0; i < rects_num; i++) {
ALLEGRO_COLOR rgba = ex.foreground;
rgba.a *= 0.5;
primitive(
x + rects[i * 4 + 0],
y + rects[i * 4 + 1],
x + rects[i * 4 + 2],
y + rects[i * 4 + 3],
rgba, false);
}
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO);
if (ex.software) {
al_set_target_bitmap(screen);
x = 8;
y = 40;
al_draw_bitmap(mem, x, y, 0);
al_destroy_bitmap(mem);
}
/* Grab screen contents into our bitmap. */
al_set_target_bitmap(ex.zoom);
al_draw_bitmap_region(screen, x, y, w, h, 0, 0, 0);
al_set_target_bitmap(screen);
/* Draw it enlarged. */
x = 80;
y = 40;
al_draw_scaled_bitmap(ex.zoom, 0, 0, w, h, x, y, w * 16, h * 16, 0);
/* Draw outlines. */
for (i = 0; i < rects_num; i++) {
primitive(
x + rects[i * 4 + 0] * 16,
y + rects[i * 4 + 1] * 16,
x + rects[i * 4 + 2] * 16,
y + rects[i * 4 + 3] * 16,
ex.outline, true);
}
set_xy(8, 640 - 48);
print("Thickness: %d (press T to change)", ex.thickness);
print("Drawing with: %s (press S to change)",
ex.software ? "software" : "hardware");
print("Supersampling: %dx (edit ex_draw.ini to change)", ex.samples);
// FIXME: doesn't work
// al_get_display_option(ALLEGRO_SAMPLE_BUFFERS));
}
static void tick(void)
{
draw();
al_flip_display();
}
static void run(void)
{
ALLEGRO_EVENT event;
bool need_draw = true;
while (1) {
if (need_draw && al_is_event_queue_empty(ex.queue)) {
tick();
need_draw = false;
}
al_wait_for_event(ex.queue, &event);
switch (event.type) {
case ALLEGRO_EVENT_DISPLAY_CLOSE:
return;
case ALLEGRO_EVENT_KEY_DOWN:
if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
return;
if (event.keyboard.keycode == ALLEGRO_KEY_SPACE) {
ex.what++;
if (ex.what == 5) ex.what = 0;
}
if (event.keyboard.keycode == ALLEGRO_KEY_S) {
ex.software = !ex.software;
}
if (event.keyboard.keycode == ALLEGRO_KEY_T) {
ex.thickness++;
if (ex.thickness == 2) ex.thickness = 0;
}
break;
case ALLEGRO_EVENT_TIMER:
need_draw = true;
break;
}
}
}
static void init(void)
{
ex.FPS = 60;
ex.font = al_load_font("data/fixed_font.tga", 0, 0);
if (!ex.font) {
abort_example("data/fixed_font.tga not found.\n");
}
ex.background = al_color_name("beige");
ex.foreground = al_color_name("black");
ex.outline = al_color_name("red");
ex.text = al_color_name("blue");
ex.white = al_color_name("white");
ex.pattern = al_create_bitmap(32, 32);
ex.zoom = al_create_bitmap(32, 32);
draw_pattern(ex.pattern);
}
int main(int argc, char **argv)
{
ALLEGRO_DISPLAY *display;
ALLEGRO_TIMER *timer;
ALLEGRO_CONFIG *config;
char const *value;
char str[256];
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
al_init_primitives_addon();
al_install_keyboard();
al_install_mouse();
al_init_image_addon();
al_init_font_addon();
init_platform_specific();
/* Read supersampling info from ex_draw.ini. */
ex.samples = 0;
config = al_load_config_file("ex_draw.ini");
if (!config)
config = al_create_config();
value = al_get_config_value(config, "settings", "samples");
if (value)
ex.samples = strtol(value, NULL, 0);
sprintf(str, "%d", ex.samples);
al_set_config_value(config, "settings", "samples", str);
al_save_config_file("ex_draw.ini", config);
al_destroy_config(config);
if (ex.samples) {
al_set_new_display_option(ALLEGRO_SAMPLE_BUFFERS, 1, ALLEGRO_REQUIRE);
al_set_new_display_option(ALLEGRO_SAMPLES, ex.samples, ALLEGRO_SUGGEST);
}
display = al_create_display(640, 640);
if (!display) {
abort_example("Unable to create display.\n");
}
init();
timer = al_create_timer(1.0 / ex.FPS);
ex.queue = al_create_event_queue();
al_register_event_source(ex.queue, al_get_keyboard_event_source());
al_register_event_source(ex.queue, al_get_mouse_event_source());
al_register_event_source(ex.queue, al_get_display_event_source(display));
al_register_event_source(ex.queue, al_get_timer_event_source(timer));
al_start_timer(timer);
run();
al_destroy_event_queue(ex.queue);
return 0;
}
/* vim: set sts=3 sw=3 et: */