/**
* Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
* Probably for speed reasons, the coefficients are evaluated as
* siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ...
* where s is an evaluated value, i is a value interpolated from the others
* and b might be either calculated or interpolated, depending on an
* unexplained condition.
*
* @param step the size of a block "siiiibiiii"
* @param in the cosine of the LSP data
* @param part is 0 for 0...PI (positive cosine values) and 1 for PI...2PI
* (negative cosine values)
* @param size the size of the whole output
*/
static inline void eval_lpcenv_or_interp(TwinVQContext *tctx,
enum TwinVQFrameType ftype,
float *out, const float *in,
int size, int step, int part)
{
int i;
const TwinVQModeTab *mtab = tctx->mtab;
const float *cos_tab = tctx->cos_tabs[ftype];
// Fill the 's'
for (i = 0; i < size; i += step)
out[i] =
eval_lpc_spectrum(in,
get_cos(i, part, cos_tab, size),
mtab->n_lsp);
// Fill the 'iiiibiiii'
for (i = step; i <= size - 2 * step; i += step) {
if (out[i + step] + out[i - step] > 1.95 * out[i] ||
out[i + step] >= out[i - step]) {
interpolate(out + i - step + 1, out[i], out[i - step], step - 1);
} else {
out[i - step / 2] =
eval_lpc_spectrum(in,
get_cos(i - step / 2, part, cos_tab, size),
mtab->n_lsp);
interpolate(out + i - step + 1, out[i - step / 2],
out[i - step], step / 2 - 1);
interpolate(out + i - step / 2 + 1, out[i],
out[i - step / 2], step / 2 - 1);
}
}
interpolate(out + size - 2 * step + 1, out[size - step],
out[size - 2 * step], step - 1);
}
t_rgb light_color(t_mesh *pov, t_llist *mesh, t_llist *spot, t_ray *l)
{
float cos;
t_rgb color;
float bright;
bright = mesh->obj.color.bright;
color = mesh->obj.color;
cos = get_cos(mesh, l);
color.r = color.r * (1 - bright) + spot->obj.color.r * bright;
color.g = color.g * (1 - bright) + spot->obj.color.g * bright;
color.b = color.b * (1 - bright) + spot->obj.color.b * bright;
color.r = color.r * cos;
color.g = color.g * cos;
color.b = color.b * cos;
color.rgb = compose(&color);
return (color);
}
void obj::camera::move(int direction) {
int modifier = modifier_for_direction(direction);
float auxAngle = angle / 180 * M_PI - (M_PI / 2);
switch (direction) {
case left:
case right:
i[0] += speed * std::cos(auxAngle) * modifier;
i[2] += speed * std::sin(auxAngle) * modifier;
break;
case front:
case back:
i[0] += speed * modifier * get_cos();
i[1] += speed * modifier * d[1];
i[2] += speed * modifier * get_sin();
break;
}
refresh_direction();
refresh_look_at();
}
/* updates positions of fires and also checks for collisions */
void update_fire(void) {
int i, j;
/* first loop to update all fires */
for (i = 0; i < MAX_FIRES; i++) {
if (fires[i].surface) {
/* if the laser has expired, free the surface and set it as off, otherwise, update its information */
if (current_time > fires[i].expire_time) {
/* fire has expired */
free_fire(i);
} else {
float factor = (((float)loop_length / 1000.0f) * (float)fires[i].velocity);
fires[i].world_x += get_cos(fires[i].angle) * factor;
fires[i].world_y += get_neg_sin(fires[i].angle) * factor;
/* update the fire, hasnt expired yet */
fires[i].screen_x = (short int)((int)fires[i].world_x - camera_x);
fires[i].screen_y = (short int)((int)fires[i].world_y - camera_y);
}
}
}
/* second loop to check for collisions */
for (i = 0; i < MAX_FIRES; i++) {
if (fires[i].surface) {
for (j = 0; j < MAX_SHIPS; j++) {
if (ships[j]) {
if ((current_time >= ships[j]->creation_delay) && (!ships[j]->landed) && (ships[j]->hull_strength > 0)) {
if (fires[i].owner != ships[j]) {
if (get_distance_sqrd(fires[i].world_x, fires[i].world_y, ships[j]->world_x, ships[j]->world_y) < (ships[j]->model->radius * ships[j]->model->radius)) {
/* collision has occured */
damage_ship(ships[j], &fires[i]);
free_fire(i);
/* do a check, it's possible the ship was destroyed and freed (and now null) in damage_ship() */
if (ships[j])
ship_was_fired_upon(ships[j]);
j = num_ships; /* dont need to continue checking for more collisions, one is enough */
}
}
}
}
}
}
/* need to recheck as a destroyed fire could have occured and 'i' may have been incremented */
if (fires[i].surface) {
for (j = 0; j < MAX_ASTEROIDS; j++) {
if (asteroids[j].on) {
if (get_distance_sqrd(fires[i].world_x, fires[i].world_y, asteroids[j].x, asteroids[j].y) < 2500) {
/* collision has occured */
damage_asteroid(j, fires[i].weapon->strength);
free_fire(i);
j = MAX_SHIPS; /* dont need to continue checking for more collisions, one is enough */
}
}
}
}
/* need to recheck as a destroyed fire could have occured and 'i' may have been incremented */
if (fires[i].surface) {
if (fires[i].owner != player.ship) {
if (get_distance_from_player_sqrd(fires[i].world_x, fires[i].world_y) < (player.ship->model->radius * player.ship->model->radius)) {
damage_ship(player.ship, &fires[i]);
free_fire(i);
}
}
}
}
}
void obj::camera::refresh_direction() {
d[0] = get_cos() + i[0];
d[2] = get_sin() + i[2];
}