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/* An example comparing different ways of drawing polygons, including usage of
* vertex buffers.
*/
#include <allegro5/allegro.h>
#include <allegro5/allegro_primitives.h>
#include <allegro5/allegro_font.h>
#include <math.h>
#include "common.c"
#define FPS 60
#define FRAME_TAU 60
#define NUM_VERTICES 4096
typedef struct METHOD METHOD;
struct METHOD
{
float x;
float y;
ALLEGRO_VERTEX_BUFFER *vbuff;
ALLEGRO_VERTEX *vertices;
const char *name;
int flags;
double frame_average;
};
static ALLEGRO_COLOR get_color(size_t ii)
{
double t = al_get_time();
double frac = (float)(ii) / NUM_VERTICES;
#define THETA(period) ((t / (period) + frac) * 2 * ALLEGRO_PI)
return al_map_rgb_f(sin(THETA(5.0)) / 2 + 1, cos(THETA(1.1)) / 2 + 1, sin(THETA(3.4) / 2) / 2 + 1);
}
static void draw_method(METHOD *md, ALLEGRO_FONT *font, ALLEGRO_VERTEX* new_vertices)
{
ALLEGRO_TRANSFORM t;
double start_time;
double new_fps;
ALLEGRO_COLOR c;
al_identity_transform(&t);
al_translate_transform(&t, md->x, md->y);
al_use_transform(&t);
al_draw_textf(font, al_map_rgb_f(1, 1, 1), 0, -50, ALLEGRO_ALIGN_CENTRE, "%s%s", md->name,
md->flags & ALLEGRO_PRIM_BUFFER_READWRITE ? "+read/write" : "+write-only");
start_time = al_get_time();
if (md->vbuff) {
if (new_vertices) {
void* lock_mem = al_lock_vertex_buffer(md->vbuff, 0, NUM_VERTICES, ALLEGRO_LOCK_WRITEONLY);
memcpy(lock_mem, new_vertices, sizeof(ALLEGRO_VERTEX) * NUM_VERTICES);
al_unlock_vertex_buffer(md->vbuff);
}
al_draw_vertex_buffer(md->vbuff, 0, 0, NUM_VERTICES, ALLEGRO_PRIM_TRIANGLE_STRIP);
}
else if (md->vertices) {
al_draw_prim(md->vertices, 0, 0, 0, NUM_VERTICES, ALLEGRO_PRIM_TRIANGLE_STRIP);
}
/* Force the completion of the previous commands by reading from screen */
c = al_get_pixel(al_get_backbuffer(al_get_current_display()), 0, 0);
(void)c;
new_fps = 1.0 / (al_get_time() - start_time);
md->frame_average += (new_fps - md->frame_average) / FRAME_TAU;
if (md->vbuff || md->vertices) {
al_draw_textf(font, al_map_rgb_f(1, 0, 0), 0, 0, ALLEGRO_ALIGN_CENTRE, "%.1e FPS", md->frame_average);
}
else {
al_draw_text(font, al_map_rgb_f(1, 0, 0), 0, 0, ALLEGRO_ALIGN_CENTRE, "N/A");
}
al_identity_transform(&t);
al_use_transform(&t);
}
int main(int argc, char **argv)
{
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_DISPLAY *display;
ALLEGRO_FONT *font;
int w = 640, h = 480;
bool done = false;
bool need_redraw = true;
bool background = false;
bool dynamic_buffers = false;
size_t num_methods;
int num_x = 3;
int num_y = 3;
int spacing_x = 200;
int spacing_y = 150;
size_t ii;
ALLEGRO_VERTEX* vertices;
(void)argc;
(void)argv;
if (!al_init()) {
abort_example("Failed to init Allegro.\n");
}
al_init_font_addon();
al_init_primitives_addon();
#ifdef ALLEGRO_IPHONE
al_set_new_display_flags(ALLEGRO_FULLSCREEN_WINDOW);
#endif
al_set_new_display_option(ALLEGRO_SUPPORTED_ORIENTATIONS,
ALLEGRO_DISPLAY_ORIENTATION_ALL, ALLEGRO_SUGGEST);
display = al_create_display(w, h);
if (!display) {
abort_example("Error creating display.\n");
}
w = al_get_display_width(display);
h = al_get_display_height(display);
al_install_keyboard();
font = al_create_builtin_font();
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_timer_event_source(timer));
al_register_event_source(queue, al_get_display_event_source(display));
vertices = al_malloc(sizeof(ALLEGRO_VERTEX) * NUM_VERTICES);
al_calculate_arc(&vertices[0].x, sizeof(ALLEGRO_VERTEX), 0, 0, 80, 30, 0, 2 * ALLEGRO_PI, 10, NUM_VERTICES / 2);
for (ii = 0; ii < NUM_VERTICES; ii++) {
vertices[ii].z = 0;
vertices[ii].color = get_color(ii);
}
{
#define GETX(n) ((w - (num_x - 1) * spacing_x) / 2 + n * spacing_x)
#define GETY(n) ((h - (num_y - 1) * spacing_y) / 2 + n * spacing_y)
METHOD methods[] =
{
{GETX(1), GETY(0), 0, vertices, "No buffer", 0, 0},
{GETX(0), GETY(1), 0, 0, "STREAM", ALLEGRO_PRIM_BUFFER_STREAM | ALLEGRO_PRIM_BUFFER_READWRITE, 0},
{GETX(1), GETY(1), 0, 0, "STATIC", ALLEGRO_PRIM_BUFFER_STATIC | ALLEGRO_PRIM_BUFFER_READWRITE, 0},
{GETX(2), GETY(1), 0, 0, "DYNAMIC", ALLEGRO_PRIM_BUFFER_STREAM | ALLEGRO_PRIM_BUFFER_READWRITE, 0},
{GETX(0), GETY(2), 0, 0, "STREAM", ALLEGRO_PRIM_BUFFER_STREAM, 0},
{GETX(1), GETY(2), 0, 0, "STATIC", ALLEGRO_PRIM_BUFFER_STATIC, 0},
{GETX(2), GETY(2), 0, 0, "DYNAMIC", ALLEGRO_PRIM_BUFFER_DYNAMIC, 0}
};
num_methods = sizeof(methods) / sizeof(METHOD);
for (ii = 0; ii < num_methods; ii++) {
METHOD* md = &methods[ii];
md->frame_average = 1;
if (!md->vertices)
md->vbuff = al_create_vertex_buffer(0, vertices, NUM_VERTICES, md->flags);
}
al_start_timer(timer);
while (!done) {
ALLEGRO_EVENT event;
if (!background && need_redraw && al_is_event_queue_empty(queue)) {
al_clear_to_color(al_map_rgb_f(0, 0, 0.2));
for (ii = 0; ii < num_methods; ii++)
draw_method(&methods[ii], font, dynamic_buffers ? vertices : 0);
al_draw_textf(font, al_map_rgb_f(1, 1, 1), 10, 10, 0, "Dynamic (D): %s", dynamic_buffers ? "yes" : "no");
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;
else if(event.keyboard.keycode == ALLEGRO_KEY_D)
dynamic_buffers = !dynamic_buffers;
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
done = true;
break;
case ALLEGRO_EVENT_DISPLAY_HALT_DRAWING:
background = true;
al_acknowledge_drawing_halt(event.display.source);
break;
case ALLEGRO_EVENT_DISPLAY_RESIZE:
al_acknowledge_resize(event.display.source);
break;
case ALLEGRO_EVENT_DISPLAY_RESUME_DRAWING:
background = false;
break;
case ALLEGRO_EVENT_TIMER:
for (ii = 0; ii < NUM_VERTICES; ii++)
vertices[ii].color = get_color(ii);
need_redraw = true;
break;
}
}
for (ii = 0; ii < num_methods; ii++)
al_destroy_vertex_buffer(methods[ii].vbuff);
al_destroy_font(font);
al_free(vertices);
}
return 0;
}
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