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flying-balls/main.cc

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C++
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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <time.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#define DEFAULT_WIDTH 800
#define DEFAULT_HEIGHT 800
#include "game.h"
#include "balls.h"
#include "c_index.h"
#include "gravity.h"
#include "spaceship.h"
/* Trivial collision check
*/
void check_collisions_simple () {
for(unsigned int i = 0; i < n_balls; ++i)
for(unsigned int j = i + 1; j < n_balls; ++j)
ball_ball_collision(balls + i, balls + j);
for(unsigned int j = 0; j < n_balls; ++j)
ball_ball_collision(&spaceship, balls + j);
gravity_collisions (balls, balls + n_balls);
gravity_collisions (&spaceship, &spaceship + 1);
}
void check_collisions_with_index () {
c_index_build();
c_index_check_collisions(ball_ball_collision);
for(unsigned int j = 0; j < n_balls; ++j)
ball_ball_collision(&spaceship, balls + j);
gravity_collisions (balls, balls + n_balls);
gravity_collisions (&spaceship, &spaceship + 1);
}
void (*check_collisions)() = check_collisions_simple;
void update_state () {
if (check_collisions)
check_collisions();
for(unsigned int i = 0; i < n_balls; ++i)
ball_update_state(balls + i);
spaceship_update_state();
}
/* Graphics System
*/
void game_init () {
srand (time(NULL));
balls_init ();
assert(c_index_init());
spaceship_init_state ();
}
void game_destroy () {
c_index_destroy ();
balls_destroy ();
}
static guint animation_timeout_id = 0;
gboolean animation_timeout (gpointer user_data);
static bool game_paused () {
return animation_timeout_id == 0;
}
void game_animation_on_off () {
if (animation_timeout_id == 0) {
animation_timeout_id = g_timeout_add (delta * 1000, animation_timeout, canvas);
} else {
g_source_remove (animation_timeout_id);
animation_timeout_id = 0;
}
}
struct param_controls {
void (*draw) (cairo_t * cr);
gint (*keyboard_input) (GdkEventKey *event);
gboolean (*mouse_scroll) (GtkWidget *widget, GdkEvent *event, gpointer user_data);
};
gint gravity_controls_keyboard_input (GdkEventKey *event) {
switch(event->keyval) {
case GDK_KEY_Up:
gravity_change (0, -10);
return TRUE;
case GDK_KEY_Down:
gravity_change (0, 10);
return TRUE;
case GDK_KEY_Left:
gravity_change (-10, 0);
return TRUE;
case GDK_KEY_Right:
gravity_change (10, 0);
return TRUE;
}
return FALSE;
}
param_controls gravity_control = {
.draw = gravity_draw,
.keyboard_input = gravity_controls_keyboard_input,
};
gint restitution_coefficient_controls_keyboard_input (GdkEventKey *event) {
switch(event->keyval) {
case GDK_KEY_Up:
restitution_coefficient_change (0.01);
return TRUE;
case GDK_KEY_Down:
restitution_coefficient_change (-0.01);
return TRUE;
case GDK_KEY_Left:
restitution_coefficient_change (-0.01);
return TRUE;
case GDK_KEY_Right:
restitution_coefficient_change (0.01);
return TRUE;
}
return FALSE;
}
param_controls restitution_coefficient_control = {
.draw = restitution_coefficient_draw,
.keyboard_input = restitution_coefficient_controls_keyboard_input,
};
static param_controls * param_control = nullptr;
static guint param_control_timeout_id = 0;
static const guint param_control_active_ms = 3000;
gboolean param_control_timeout (gpointer user_data) {
param_control = nullptr;
param_control_timeout_id = 0;
gtk_widget_queue_draw(canvas);
return FALSE;
}
void param_control_activate (struct param_controls * ctrl) {
if (param_control)
g_source_remove (param_control_timeout_id);
param_control = ctrl;
param_control_timeout_id = g_timeout_add (param_control_active_ms, param_control_timeout, canvas);
gtk_widget_queue_draw(canvas);
}
gboolean draw_frame (GtkWidget * widget, cairo_t *cr, gpointer data) {
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
cairo_paint(cr);
if (param_control)
param_control->draw (cr);
gravity_draw_visible_field (cr);
balls_draw (cr);
spaceship_draw (cr);
return FALSE;
}
gint configure_event (GtkWidget *widget, GdkEventConfigure * event) {
if (width == event->width && height == event->height)
return FALSE;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
for (ball * b = balls; b != balls + n_balls; ++b)
ball_reposition (b);
ball_reposition (&spaceship);
return TRUE;
}
gint keyboard_input (GtkWidget *widget, GdkEventKey *event) {
if (event->type != GDK_KEY_PRESS)
return FALSE;
if (param_control && param_control->keyboard_input (event)) {
gtk_widget_queue_draw(canvas);
g_source_remove (param_control_timeout_id);
param_control_timeout_id = g_timeout_add (param_control_active_ms, param_control_timeout, canvas);
return TRUE;
}
switch(event->keyval) {
case GDK_KEY_R:
case GDK_KEY_r:
param_control_activate (&restitution_coefficient_control);
return TRUE;
case GDK_KEY_G:
case GDK_KEY_g:
param_control_activate (&gravity_control);
return TRUE;
case GDK_KEY_P:
case GDK_KEY_p:
game_animation_on_off ();
return TRUE;
case GDK_KEY_Q:
case GDK_KEY_q:
gtk_main_quit();
return TRUE;
}
return FALSE;
}
gboolean mouse_scroll (GtkWidget *widget, GdkEvent *event, gpointer user_data) {
if (event->type == GDK_SCROLL && ! game_paused ()) {
GdkEventScroll * e = (GdkEventScroll*) event;
switch (e->direction) {
case GDK_SCROLL_SMOOTH: {
double dx, dy;
gdk_event_get_scroll_deltas (event, &dx, &dy);
spaceship_control (dx, dy);
break;
}
default:
break;
}
}
return TRUE;
}
void destroy_window (void) {
gtk_main_quit();
}
void print_usage (const char * progname) {
fprintf(stderr,
"usage: %s [options...]\n"
"options:\n"
"\t<width>x<height>\n"
"\tn=<number of balls>\n"
"\tfconst=<x-force>,<y-force> :: constant force field\n"
"\tfnewt=<radius>,<g> :: radial, Newtonian force field\n"
"\tfy=<y-force>\n"
"\tradius=<min-radius>-<max-radius>\n"
"\tv=<min-velocity>-<max-velocity>\n"
"\tdelta=<frame-delta-time> (in seconds)\n"
"\tface=<filename>\n"
"\tstats=<sample-count> :: rendering timing statitstics (0=disabled, default)\n"
"\tcollisions=<C> :: n=no collisions, s=simple, i=index\n"
"\trestitution=<C_r> :: restitution coefficient C_r\n"
"\t-r :: activate face rotation\n",
progname);
}
static unsigned int stats_sampling = 0;
static guint64 stats_update_usec = 0;
static unsigned int stats_update_samples = 0;
static guint64 stats_draw_usec = 0;
static unsigned int stats_draw_samples = 0;
gboolean draw_event (GtkWidget *widget, cairo_t * cr, gpointer data) {
if (stats_sampling > 0) {
guint64 start = g_get_monotonic_time ();
draw_frame (widget, cr, data);
stats_draw_usec += g_get_monotonic_time () - start;
++stats_draw_samples;
} else
draw_frame (widget, cr, data);
return FALSE;
}
gboolean animation_timeout (gpointer user_data) {
if (stats_sampling > 0) {
guint64 start = g_get_monotonic_time ();
update_state();
stats_update_usec += g_get_monotonic_time () - start;
if (++stats_update_samples == stats_sampling) {
float uavg = 1.0*stats_update_usec / stats_update_samples;
float davg = 1.0*stats_draw_usec / stats_draw_samples;
printf("\rupdate = %.0f us, draw = %.0f us, load = %.0f%% (%u update, %u draw) ",
uavg, davg, (uavg+davg)/(10000.0*delta),
stats_update_samples, stats_draw_samples);
fflush(stdout);
stats_update_usec = 0;
stats_update_samples = 0;
stats_draw_usec = 0;
stats_draw_samples = 0;
}
} else {
update_state();
}
gtk_widget_queue_draw(canvas);
return TRUE;
}
int main (int argc, const char *argv[]) {
int w = DEFAULT_WIDTH;
int h = DEFAULT_HEIGHT;
double fa, fb;
for (int i = 1; i < argc; ++i) {
if (sscanf(argv[i], "%dx%d", &w, &h) == 2)
continue;
if (sscanf(argv[i], "n=%u", &n_balls) == 1)
continue;
if (sscanf(argv[i], "fconst=%lf,%lf", &fa, &fb) == 2) {
gravity_constant_field (fa,fb);
continue;
}
if (sscanf(argv[i], "fnewt=%lf,%lf", &fa, &fb) == 2) {
gravity_newton_field (fa,fb);
continue;
}
if (sscanf(argv[i], "radius=%u-%u", &radius_min, &radius_max) == 2)
continue;
if (sscanf(argv[i], "v=%u-%u", &v_min, &v_max) == 2)
continue;
if (sscanf(argv[i], "delta=%lf", &delta) == 1)
continue;
if (strncmp(argv[i], "face=", 5) == 0) {
face_filename = argv[i] + 5;
continue;
}
if (sscanf(argv[i], "stats=%u", &stats_sampling) == 1)
continue;
char collisions;
if (sscanf(argv[i], "collisions=%c", &collisions) == 1) {
switch (collisions) {
case 'i':
case 'I':
check_collisions = check_collisions_with_index;
continue;
case '0':
case 'N':
case 'n':
check_collisions = 0;
continue;
case 's':
case 'S':
check_collisions = check_collisions_simple;
continue;
}
}
if (strcmp(argv[i], "-r") == 0) {
face_rotation = 1;
continue;
}
double c_r;
if (sscanf(argv[i], "restitution=%lf", &c_r) == 1) {
restitution_coefficient_set (c_r);
continue;
}
print_usage(argv[0]);
return 1;
}
gtk_init(0, 0);
GtkWidget * window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), width, height);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_title(GTK_WINDOW(window), "Game");
g_signal_connect(window, "destroy", G_CALLBACK(destroy_window), NULL);
g_signal_connect (G_OBJECT (window), "delete-event", G_CALLBACK(destroy_window), NULL);
g_signal_connect(G_OBJECT (window), "key-press-event", G_CALLBACK(keyboard_input), NULL);
gtk_widget_set_events (window, GDK_EXPOSURE_MASK | GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK | GDK_KEY_PRESS_MASK);
canvas = gtk_drawing_area_new ();
g_signal_connect (G_OBJECT (canvas), "configure-event", G_CALLBACK(configure_event), NULL);
g_signal_connect (G_OBJECT (canvas), "draw", G_CALLBACK (draw_event), NULL);
g_signal_connect (G_OBJECT (canvas), "scroll-event",G_CALLBACK(mouse_scroll), NULL);
gtk_widget_set_events (canvas, GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK);
gtk_container_add (GTK_CONTAINER (window), canvas);
game_animation_on_off ();
gtk_widget_show_all(window);
game_init ();
gtk_main();
if (stats_sampling > 0)
printf("\n");
game_destroy ();
return 0;
}
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