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// these only apply to computer-generated setups
#define SETUP_MIN_X 1.0f
#define SETUP_MAX_X 10.0f
#define SETUP_MIN_Y 1.0f
#define SETUP_MAX_Y 15.0f
static v2 setup_rand_point(void) {
return V2(
rand_uniform(SETUP_MIN_X, SETUP_MAX_X),
rand_uniform(SETUP_MIN_Y, SETUP_MAX_Y)
);
}
#if 0
static void setup_random(Setup *setup, float cost_allowed) {
// how much "money" we have to spend
float cost_left = cost_allowed;
while (cost_left > PLATFORM_RADIUS_MIN * PLATFORM_RADIUS_COST && setup->nplatforms < MAX_PLATFORMS) {
Platform *platform = &setup->platforms[setup->nplatforms++];
platform->color = rand_u32() | 0xFF;
float max_radius_allowed = cost_left / PLATFORM_RADIUS_COST;
if (max_radius_allowed > PLATFORM_RADIUS_MAX)
max_radius_allowed = PLATFORM_RADIUS_MAX;
platform->radius = rand_uniform(PLATFORM_RADIUS_MIN, max_radius_allowed);
platform->center = setup_rand_point();
platform->start_angle = rand_uniform(0, PIf);
cost_left -= platform->radius * PLATFORM_RADIUS_COST;
if (cost_left > PLATFORM_MOVE_SPEED_COST * PLATFORM_MOVE_SPEED_MIN) {
if (randf() < PLATFORM_MOVE_CHANCE) {
platform->moves = true;
float max_speed_allowed = cost_left / PLATFORM_MOVE_SPEED_COST;
if (max_speed_allowed > PLATFORM_MOVE_SPEED_MAX)
max_speed_allowed = PLATFORM_MOVE_SPEED_MAX;
platform->move_speed = rand_uniform(PLATFORM_MOVE_SPEED_MIN, max_speed_allowed);
platform->move_p1 = platform->center;
platform->move_p2 = setup_rand_point();
cost_left -= platform->move_speed * PLATFORM_MOVE_SPEED_COST;
}
}
if (cost_left > PLATFORM_ROTATE_SPEED_COST * 0.1f) {
if (randf() < PLATFORM_ROTATE_CHANCE) {
float max_rotate_speed_allowed = cost_left / PLATFORM_ROTATE_SPEED_COST;
if (max_rotate_speed_allowed > PLATFORM_ROTATE_SPEED_MAX)
max_rotate_speed_allowed = PLATFORM_ROTATE_SPEED_MAX;
platform->rotates = true;
platform->rotate_speed = rand_uniform(0.1f, max_rotate_speed_allowed);
if (rand() % 2)
platform->rotate_speed = -platform->rotate_speed; // clockwise
cost_left -= fabsf(platform->rotate_speed) * PLATFORM_ROTATE_SPEED_COST;
}
}
}
assert(cost_left >= 0);
}
#endif
static void setup_random(State *state, Setup *setup) {
u32 i, j, t;
u32 const max_failed_attempts = 100;
Platform *platforms = setup->platforms;
for (i = 0; i < MAX_PLATFORMS; ++i) {
for (t = 0; t < max_failed_attempts; ++t) {
Platform *platform = &platforms[i];
memset(platform, 0, sizeof *platform);
platform_random(platform);
Rect bbox = platform_bounding_box(platform);
for (j = 0; j < i; ++j) {
Rect bbox_other = platform_bounding_box(&platforms[j]);
if (rects_intersect(bbox, bbox_other)) {
break;
}
}
if (bbox.pos.x > state->left_x // ensure that platform is to the right of left wall
&& j == i) {
// we successfully placed a platform!
break;
}
}
if (t == max_failed_attempts) {
// if we failed enough attempts to make a non-intersecting platform, give up
break;
}
}
setup->nplatforms = i;
}
static void setup_reset(State *state) {
{ // reset ball
Ball *ball = &state->ball;
b2World *world = state->world;
if (ball->body)
world->DestroyBody(ball->body);
ball->radius = 0.3f;
ball->pos = BALL_STARTING_POS;
// create ball
b2BodyDef ball_def;
ball_def.type = b2_dynamicBody;
ball_def.position.Set(ball->pos.x, ball->pos.y);
b2Body *ball_body = ball->body = world->CreateBody(&ball_def);
b2CircleShape ball_shape;
ball_shape.m_radius = ball->radius;
b2FixtureDef ball_fixture;
ball_fixture.shape = &ball_shape;
ball_fixture.density = 1.0f;
ball_fixture.friction = 0.3f;
ball_fixture.restitution = 0.6f; // bounciness
ball_body->CreateFixture(&ball_fixture);
}
for (Platform *platform = state->platforms, *end = platform + state->nplatforms; platform != end; ++platform) { // reset platforms
b2Body *body = platform->body;
assert(body);
platform->angle = platform->start_angle;
if (platform->moves) platform->center = platform->move_p1;
body->SetTransform(v2_to_b2(platform->center), platform->angle);
if (platform->moves) {
float speed = platform->move_speed;
v2 p1 = platform->move_p1, p2 = platform->move_p2;
v2 direction = v2_normalize(v2_sub(p2, p1));
v2 velocity = v2_scale(direction, speed);
body->SetLinearVelocity(v2_to_b2(velocity));
}
body->SetAngularVelocity(platform->rotate_speed);
}
state->setting_move_p2 = false;
state->furthest_ball_x_pos = 0;
state->stuck_time = 0;
state->total_time = 0;
state->time_residue = 0;
}
// make this setup the active one
static void setup_use(State *state, Setup *setup) {
b2World *world = state->world;
// get rid of old platform bodies
for (u32 i = 0; i < state->nplatforms; ++i) {
Platform *p = &state->platforms[i];
if (p->body)
world->DestroyBody(p->body);
}
memcpy(state->platforms, setup->platforms, setup->nplatforms * sizeof(Platform));
state->nplatforms = setup->nplatforms;
// create new bodies
for (u32 i = 0; i < state->nplatforms; ++i) {
Platform *p = &state->platforms[i];
p->body = NULL;
platform_make_body(state, p, i);
}
assert((u32)world->GetBodyCount() == state->nplatforms + 2); // platforms + 2 walls
setup_reset(state);
}
static float setup_score(State *state, Setup *setup) {
setup_use(state, setup);
Ball *ball = &state->ball;
float starting_line = platforms_starting_line(setup->platforms, setup->nplatforms);
while (ball->body) {
simulate_time(state, 0.1f);
}
setup->score = ball->pos.x - starting_line;
setup->total_time = state->total_time;
return setup->score;
}
static bool setup_write_to_file(Setup const *setup, char const *filename) {
FILE *fp = fopen(filename, "wb");
if (fp) {
u32 nplatforms = setup->nplatforms;
fwrite_u32(fp, nplatforms);
for (u32 i = 0; i < nplatforms; ++i) {
platform_write_to_file(&setup->platforms[i], fp);
}
fclose(fp);
return true;
} else {
logln("Couldn't write setup to %s.", filename);
return false;
}
}
static bool setup_read_from_file(Setup *setup, char const *filename) {
FILE *fp = fopen(filename, "rb");
if (fp) {
u32 nplatforms = setup->nplatforms = fread_u32(fp);
for (u32 i = 0; i < nplatforms; ++i) {
platform_read_from_file(&setup->platforms[i], fp);
}
fclose(fp);
return true;
} else {
logln("Couldn't read setup from %s.", filename);
return false;
}
}
// meant for use with qsort, to sort by descending score
static int setup_compare_scores(void const *a_void, void const *b_void) {
Setup const *a = (Setup const *)a_void, *b = (Setup const *)b_void;
if (a->score > b->score) {
return -1;
} else if (a->score < b->score) {
return +1;
}
return 0;
}
static void setup_mutate(State *state, Setup *setup, float mutation_rate) {
for (Platform *platform = setup->platforms, *end = platform + setup->nplatforms;
platform != end; ++platform) {
if (randf() < mutation_rate)
platform_mutate(state, setup, platform);
}
}
// sort setups to put best ones at the start
static void setups_sort(State *state) {
qsort(state->setups, arr_count(state->setups), sizeof(Setup), setup_compare_scores);
}
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