#include "ingame.h"
#include "scene.h"
#include "twn_game_api.h"
#include "twn_vec.h"
#define STB_PERLIN_IMPLEMENTATION
#include <stb_perlin.h>
#include <SDL2/SDL.h>
#include <stdlib.h>
#define TERRAIN_FREQUENCY 0.15f
#define TERRAIN_RADIUS 128
#define GRASS_RADIUS 16
#define TERRAIN_DISTANCE (TERRAIN_RADIUS * 2)
#define HALF_TERRAIN_DISTANCE ((float)TERRAIN_DISTANCE / 2)
#define PLAYER_HEIGHT 0.6f
#define TREE_DENSITY 0.03f
#define G_CONST 10.0f
/* TODO: pregenerate grid of levels of detail */
static float heightmap[TERRAIN_DISTANCE][TERRAIN_DISTANCE];
/* vehicle sim ! */
/* https://www.youtube.com/watch?v=pwbwFdWBkU0 */
/* representation is a "jelly" box with spring configuration trying to make it coherent */
/* == springs == */
/* damped spring: F = -kx - cv */
/* x = length(p1-p0) - at_rest_length */
/* v = dot(v1 - v0, unit(p1-p0)) */
/* F = (-kx - cv) * unit(p1-p0) */
/* v += (F/m)*t */
/* one points gains positive F, other negative F, to come together */
/* == ground interaction == */
/* if point is under terrain, then apply this: */
/* x = y difference on point and ground */
/* -x(n) = x * normal */
/* -v(n) = dot(v, normal) */
/* -F = (-kx(n)-cv(n)) * normal */
/* == friction == */
/* v(o)/F(o) are perpendicular to slope (x - x(n)) */
/* if v(o) == 0, then */
/* -- at rest, static friction overcomes */
/* if F(o) <= f(s)*x(n), F(o) = 0 */
/* else, F(o) -= f(k) * x(n) */
/* else if length(v(o) + (F(o)/m)*t) <= (f(k)*x(n)*t), v(o) = 0 */
/* else, F = -unit(v(o)*f(k)*x(n)) */
#define VEHICLE_MASS 200.0f
#define VEHICLE_LENGTH 3.0f
#define VEHICLE_WIDTH 1.7f
#define VEHICLE_HEIGHT 1.3f
/* spring constant */
#define VEHICLE_SPRING_K 22000.0f
#define VEHICLE_SPRING_K_SHOCK 18000.0f
#define VEHICLE_SPRING_GK 70000.0f
/* damping constant */
#define VEHICLE_SPRING_C 800.0f
#define VEHICLE_SPRING_C_SHOCK 500.0f
#define VEHICLE_SPRING_GC 100.0f
#define VEHICLE_FRICTION_S 1000.0f
#define VEHICLE_FRICTION_K 110.0f
#define VEHICLE_FRICTION_V 4000.0f
/* TODO: shock springs, that are more loose, which are used to simulate the wheels */
/* initial, ideal corner positions */
static const Vec3 vbpi[8] = {
[0] = { 0, 0, 0 },
[1] = { VEHICLE_LENGTH, 0, 0 },
[2] = { VEHICLE_LENGTH, 0, VEHICLE_WIDTH },
[3] = { 0, 0, VEHICLE_WIDTH },
[4] = { 0, VEHICLE_HEIGHT, 0 },
[5] = { VEHICLE_LENGTH, VEHICLE_HEIGHT, 0 },
[6] = { VEHICLE_LENGTH, VEHICLE_HEIGHT, VEHICLE_WIDTH },
[7] = { 0, VEHICLE_HEIGHT, VEHICLE_WIDTH },
};
/* corner positions in simulation */
static Vec3 vbp[8] = { vbpi[0], vbpi[1], vbpi[2], vbpi[3],
vbpi[4], vbpi[5], vbpi[6], vbpi[7], };
/* corner velocities */
static Vec3 vbv[8];
/* springs */
static uint8_t vbs[28][2] = {
{0, 1}, {4, 5}, {0, 4},
{1, 2}, {5, 6}, {1, 5},
{2, 3}, {6, 7}, {2, 6},
{3, 0}, {7, 4}, {3, 7},
{0, 2}, {0, 5}, {0, 7},
{1, 3}, {1, 6}, {1, 4},
{4, 6}, {2, 7}, {2, 5},
{5, 7}, {3, 4}, {3, 6},
{0, 6}, {1, 7}, {2, 4}, {3, 5},
};
/* ackermann steering geometry */
static float vehicle_turning_extend;
static float vehicle_turning_speed = 0.12f;
static float vehicle_turning_extend_limit = VEHICLE_WIDTH * 1.75f;
static float height_at(SceneIngame *scn, Vec2 position);
static Vec3 normal_at(SceneIngame *scn, Vec2 position);
static inline float clampf(float f, float min, float max) {
const float t = f < min ? min : f;
return t > max ? max : t;
}
static void draw_vehicle(SceneIngame *scn) {
for (size_t i = 0; i < 12; ++i)
draw_line_3d(vbp[vbs[i][0]], vbp[vbs[i][1]], 1, (Color){255, 255, 255, 255});
for (size_t i = 12; i < 24; ++i)
draw_line_3d(vbp[vbs[i][0]], vbp[vbs[i][1]], 1, (Color){200, 200, 200, 255});
for (size_t i = 24; i < 28; ++i)
draw_line_3d(vbp[vbs[i][0]], vbp[vbs[i][1]], 1, (Color){255, 125, 125, 255});
}
static void process_vehicle(SceneIngame *scn) {
/* apply gravity */
Vec3 Facc[8] = {0};
/* steering */
bool steered = false;
if (input_action_pressed("player_left")) {
vehicle_turning_extend -= vehicle_turning_speed;
steered = true;
}
if (input_action_pressed("player_right")) {
vehicle_turning_extend += vehicle_turning_speed;
steered = true;
}
if (!steered)
vehicle_turning_extend -= copysignf(vehicle_turning_speed * 0.9f, vehicle_turning_extend);
vehicle_turning_extend = clampf(vehicle_turning_extend, -vehicle_turning_extend_limit, vehicle_turning_extend_limit);
if (fabsf(vehicle_turning_extend) <= 0.11f)
vehicle_turning_extend = 0;
Vec3 const Fg = { .y = -VEHICLE_MASS * G_CONST };
for (size_t i = 0; i < 8; ++i)
Facc[i] = vec3_add(Facc[i], Fg);
/* apply springs */
for (size_t i = 0; i < 28; ++i) {
Vec3 const p0 = vbp[vbs[i][0]];
Vec3 const p1 = vbp[vbs[i][1]];
Vec3 const v0 = vbv[vbs[i][0]];
Vec3 const v1 = vbv[vbs[i][1]];
Vec3 const pd = vec3_sub(p1, p0);
Vec3 const pn = vec3_norm(pd);
/* TODO: length at rest could be precalculated */
float const lar = vec3_length(vec3_sub(vbpi[vbs[i][1]], vbpi[vbs[i][0]]));
float const x = vec3_length(pd) - lar;
float const v = vec3_dot(vec3_sub(v1, v0), pn);
float const spring_k = i == 2 | i == 5 || i == 8 || i == 11 ? VEHICLE_SPRING_K_SHOCK : VEHICLE_SPRING_K;
float const spring_c = i == 2 | i == 5 || i == 8 || i == 11 ? VEHICLE_SPRING_C_SHOCK : VEHICLE_SPRING_C;
Vec3 const Fs = vec3_scale(pn, -spring_k * x - spring_c * v);
Facc[vbs[i][0]] = vec3_sub(Facc[vbs[i][0]], Fs);
Facc[vbs[i][1]] = vec3_add(Facc[vbs[i][1]], Fs);
}
/* spring and friction against the ground */
for (size_t i = 0; i < 8; ++i) {
Vec3 const p = vbp[i];
Vec3 const v = vbv[i];
float const h = height_at(scn, (Vec2){ p.x, p.z });
Vec3 const fwd = vec3_norm(vec3_sub(vbp[1], vbp[0]));
if (h >= p.y) {
/* back wheel processing: acceleration */
if (i == 0 || i == 3) {
float scale = 0;
if (scn->camera_mode == 2 && input_action_pressed("player_forward"))
scale += 1;
if (scn->camera_mode == 2 && input_action_pressed("player_backward"))
scale -= 1;
Facc[i] = vec3_add(Facc[i], vec3_scale(fwd, 6500 * scale));
}
/* normal force, for displacement */
Vec3 const n = normal_at(scn, (Vec2){ p.x, p.z });
float const xn = (h - p.y) * n.y;
float const vn = vec3_dot(v, n);
Vec3 const Fn = vec3_scale(n, -VEHICLE_SPRING_GK * xn - VEHICLE_SPRING_GC * vn);
Facc[i] = vec3_sub(Facc[i], Fn);
/* friction force, perpendicular to normal force */
/* TODO: is it right? aren't vn+vol should be = |v| */
Vec3 const von = vec3_norm(vec3_cross(n, vec3_cross(v, n)));
Vec3 const vo = vec3_scale(vec3_scale(von, vec3_length(v) - vn), -1);
float const vol = vec3_length(vo);
Vec3 const Fon = vec3_norm(vec3_cross(n, vec3_cross(Facc[i], n)));
Vec3 Fo = vec3_scale(vec3_scale(Fon, vec3_length(Facc[i]) - vec3_dot(Facc[i], n)), -1);
/* portion of total force along the surface */
float const Fol = vec3_length(Fo);
float const fkxn = VEHICLE_FRICTION_K * xn;
/* at rest, might want to start moving */
if (fabsf(0.0f - vol) <= 0.0001f) {
/* cannot overcome static friction, force along the surface is zeroed */
if (Fol <= VEHICLE_FRICTION_S * xn) { Fo = vec3_scale(Fo, -1);}
/* resist the force by friction, while starting to move */
else { Fo = vec3_sub(Fo, vec3_scale(von, fkxn));}
/* not at rest, stop accelerating along the surface */
} else if (vol + (Fol / VEHICLE_MASS) * ctx.frame_duration <= fkxn * ctx.frame_duration * 2) {
/* ugh ... */
vbv[i] = vec3_add(v, vo);
/* just apply friction */
} else {
Fo = vec3_scale(von, -fkxn * 400);
}
Facc[i] = vec3_add(Facc[i], Fo);
/* rear wheel friction */
if (i == 0 || i == 3) {
Vec3 const pn = vec3_cross(fwd, n);
Vec3 const Fp = vec3_scale(pn, vec3_dot(v, pn) * -VEHICLE_FRICTION_V);
Facc[i] = vec3_add(Facc[i], Fp);
}
/* front wheel processing */
if (i == 1 || i == 2) {
/* steering influences "center of turning", which is a point */
/* laying on line defined by rear axle */
/* front arms are rotated to be perpendicular to center of turning, */
/* which then are used to dissipate forces, thus providing control */
Vec3 const rear_bar = vec3_sub(vbp[0], vbp[3]);
Vec3 const rear_center = vec3_add(vbp[3], vec3_scale(rear_bar, 0.5));
Vec3 a, b, r;
if (i == 1) {
a = vec3_sub(vbp[3], vbp[2]);
b = vec3_sub(rear_center, vbp[2]);
r = vbp[2];
} else {
a = vec3_sub(vbp[0], vbp[1]);
b = vec3_sub(rear_center, vbp[1]);
r = vbp[1];
}
float const arm_angle = vec3_angle(a, b);
Vec3 const turn_center = vec3_add(rear_center, vec3_scale(vec3_norm(rear_bar), vehicle_turning_extend));
Vec3 const arm = vec3_sub(r, turn_center);
Vec3 const n = vec3_norm(vec3_cross(a, b));
Vec3 const wheel = vec3_norm(vec3_rotate(arm, -arm_angle, n));
Vec3 const p = vec3_norm(vec3_cross(wheel, n));
draw_line_3d(r, vec3_add(r, p), 1, (Color){0,255,255,255});
Vec3 const Fp = vec3_scale(p, vec3_dot(v, p) * -VEHICLE_FRICTION_V);
Facc[i] = vec3_add(Facc[i], Fp);
}
}
Vec3 vd = vec3_scale(vec3_scale(Facc[i], (1.0f / VEHICLE_MASS)), ctx.frame_duration);
vbv[i] = vec3_add(vbv[i], vd);
vbp[i] = vec3_add(vbp[i], vec3_scale(vbv[i], ctx.frame_duration));
}
}
static void process_vehicle_mode(State *state) {
SceneIngame *scn = (SceneIngame *)state->scene;
Vec3 const top_center = vec3_sub(vbp[4], vec3_scale(vec3_sub(vbp[4], vbp[6]), 1.0f / 2.0f));
// Vec3 const front_center = vec3_add(vbp[4], vec3_scale(vec3_sub(vbp[4], vbp[7]), 1.0f / 2.0f));
// Vec3 const facing_direction = vec3_sub(top_center, front_center);
float yawc, yaws, pitchc, pitchs;
sincosf(scn->yaw + (float)M_PI_2, &yaws, &yawc);
sincosf(scn->pitch, &pitchs, &pitchc);
Vec3 const looking_direction = vec3_norm(((Vec3){
yawc * pitchc,
pitchs,
yaws * pitchc,
}));
Vec3 const orbit = vec3_sub(top_center, vec3_scale(looking_direction, 7.5));
draw_camera(orbit, looking_direction, (Vec3){0,1,0}, (float)M_PI_2 * 0.8f, 1, TERRAIN_RADIUS * sqrtf(3));
scn->looking_direction = looking_direction;
scn->pos = top_center;
}
static void process_fly_mode(State *state) {
SceneIngame *scn = (SceneIngame *)state->scene;
DrawCameraFromPrincipalAxesResult dir_and_up =
draw_camera_from_principal_axes(scn->pos, scn->roll, scn->pitch, scn->yaw, (float)M_PI_2 * 0.8f, 1, TERRAIN_RADIUS * sqrtf(3));
scn->looking_direction = dir_and_up.direction;
const Vec3 right = m_vec_norm(m_vec_cross(dir_and_up.direction, dir_and_up.up));
const float speed = 0.1f; /* TODO: put this in a better place */
if (input_action_pressed("player_left"))
scn->pos = vec3_sub(scn->pos, m_vec_scale(right, speed));
if (input_action_pressed("player_right"))
scn->pos = vec3_add(scn->pos, m_vec_scale(right, speed));
if (input_action_pressed("player_forward"))
scn->pos = vec3_add(scn->pos, m_vec_scale(dir_and_up.direction, speed));
if (input_action_pressed("player_backward"))
scn->pos = vec3_sub(scn->pos, m_vec_scale(dir_and_up.direction, speed));
if (input_action_pressed("player_jump"))
scn->pos.y += speed;
if (input_action_pressed("player_run"))
scn->pos.y -= speed;
}
/* TODO: could be baked in map format */
static Vec3 normal_at(SceneIngame *scn, Vec2 position) {
int const x = (int)(floorf(position.x - scn->world_center.x));
int const y = (int)(floorf(position.y - scn->world_center.y));
float const height0 = heightmap[x][y];
float const height1 = heightmap[x + 1][y];
float const height2 = heightmap[x][y + 1];
Vec3 const a = { .x = 1, .y = height0 - height1, .z = 0 };
Vec3 const b = { .x = 0, .y = height0 - height2, .z = -1 };
return vec3_norm(vec3_cross(a, b));
}
/* TODO: don't operate on triangles, instead interpolate on quads */
static float height_at(SceneIngame *scn, Vec2 position) {
int const x = (int)(floorf(position.x - scn->world_center.x));
int const y = (int)(floorf(position.y - scn->world_center.y));
float const height0 = heightmap[x][y];
float const height1 = heightmap[x + 1][y];
float const height2 = heightmap[x][y + 1];
float const height3 = heightmap[x + 1][y + 1];
Vec2 incell = { position.x - floorf(position.x), position.y - floorf(position.y) };
float const weight0 = (1 - incell.x) * (1 - incell.y);
float const weight1 = ( incell.x) * (1 - incell.y);
float const weight2 = (1 - incell.x) * ( incell.y);
float const weight3 = ( incell.x) * ( incell.y);
return (height0 * weight0 + height1 * weight1 + height2 * weight2 + height3 * weight3) / (weight0 + weight1 + weight2 + weight3);
}
static void process_ground_mode(State *state) {
SceneIngame *scn = (SceneIngame *)state->scene;
DrawCameraFromPrincipalAxesResult dir_and_up =
draw_camera_from_principal_axes(scn->pos, scn->roll, scn->pitch, scn->yaw, (float)M_PI_2 * 0.8f, 1, TERRAIN_RADIUS * sqrtf(3));
scn->looking_direction = dir_and_up.direction;
dir_and_up.direction.y = 0;
dir_and_up.direction = vec3_norm(dir_and_up.direction);
const Vec3 right = m_vec_norm(m_vec_cross(dir_and_up.direction, dir_and_up.up));
const float speed = 0.20f; /* TODO: put this in a better place */
Vec3 target = scn->pos;
/* gravity */
{
float const height = height_at(scn, (Vec2){scn->pos.x, scn->pos.z});
if (target.y > height + PLAYER_HEIGHT)
target.y = target.y - 0.6f;
if (target.y < height + PLAYER_HEIGHT)
target.y = height + PLAYER_HEIGHT;
}
/* movement */
{
Vec3 direction = {0, 0, 0};
if (input_action_pressed("player_left"))
direction = m_vec_sub(direction, m_vec_scale(right, speed));
if (input_action_pressed("player_right"))
direction = m_vec_add(direction, m_vec_scale(right, speed));
if (input_action_pressed("player_forward"))
direction = m_vec_add(direction, m_vec_scale(dir_and_up.direction, speed));
if (input_action_pressed("player_backward"))
direction = m_vec_sub(direction, m_vec_scale(dir_and_up.direction, speed));
target = m_vec_add(target, direction);
}
/* interpolate */
scn->pos.x = (target.x - scn->pos.x) * (0.13f / 0.9f) + scn->pos.x;
scn->pos.y = (target.y - scn->pos.y) * (0.13f / 0.9f) + scn->pos.y;
scn->pos.z = (target.z - scn->pos.z) * (0.13f / 0.9f) + scn->pos.z;
}
static void generate_terrain(SceneIngame *scn) {
for (int ly = 0; ly < TERRAIN_DISTANCE; ly++) {
for (int lx = 0; lx < TERRAIN_DISTANCE; lx++) {
float x = floorf(scn->pos.x - HALF_TERRAIN_DISTANCE + (float)lx);
float y = floorf(scn->pos.z - HALF_TERRAIN_DISTANCE + (float)ly);
float height = stb_perlin_noise3((float)x * TERRAIN_FREQUENCY, (float)y * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 1;
height += stb_perlin_noise3((float)x * TERRAIN_FREQUENCY / 10, (float)y * TERRAIN_FREQUENCY / 10, 0, 0, 0, 0) * 20 - 1;
heightmap[lx][ly] = height;
}
}
scn->world_center = (Vec2){ floorf(scn->pos.x - HALF_TERRAIN_DISTANCE), floorf(scn->pos.z - HALF_TERRAIN_DISTANCE) };
}
static int32_t ceil_sqrt(int32_t const n) {
int32_t res = 1;
while(res * res < n)
res++;
return res;
}
static uint32_t adler32(const void *buf, size_t buflength) {
const uint8_t *buffer = (const uint8_t*)buf;
uint32_t s1 = 1;
uint32_t s2 = 0;
for (size_t n = 0; n < buflength; n++) {
s1 = (s1 + buffer[n]) % 65521;
s2 = (s2 + s1) % 65521;
}
return (s2 << 16) | s1;
}
static void draw_terrain(SceneIngame *scn) {
/* used to cull invisible tiles over field of view (to horizon) */
Vec2 const d = vec2_norm((Vec2){ .x = scn->looking_direction.x, .y = scn->looking_direction.z });
float const c = cosf((float)M_PI_2 * 0.8f * 0.8f);
/* draw terrain in circle */
int32_t const rsi = (int32_t)TERRAIN_RADIUS * (int32_t)TERRAIN_RADIUS;
for (int32_t iy = -(int32_t)TERRAIN_RADIUS; iy <= (int32_t)TERRAIN_RADIUS - 1; ++iy) {
int32_t const dx = ceil_sqrt(rsi - (iy + (iy <= 0)) * (iy + (iy <= 0)));
for (int32_t ix = -dx; ix < dx - 1; ++ix) {
int32_t lx = ix + TERRAIN_RADIUS;
int32_t ly = iy + TERRAIN_RADIUS;
float x = (float)(floorf(scn->pos.x - HALF_TERRAIN_DISTANCE + (float)lx));
float y = (float)(floorf(scn->pos.z - HALF_TERRAIN_DISTANCE + (float)ly));
/* cull tiles outside of vision */
if (vec2_dot(vec2_norm((Vec2){x - scn->pos.x + d.x * 2, y - scn->pos.z + d.y * 2}), d) < c)
continue;
float d0 = heightmap[lx][ly];
float d1 = heightmap[lx + 1][ly];
float d2 = heightmap[lx + 1][ly - 1];
float d3 = heightmap[lx][ly - 1];
draw_quad("/assets/grass2.png",
(Vec3){ (float)x, d0, (float)y },
(Vec3){ (float)x + 1, d1, (float)y },
(Vec3){ (float)x + 1, d2, (float)y - 1 },
(Vec3){ (float)x, d3, (float)y - 1 },
(Rect){ .w = 128, .h = 128 },
(Color){255, 255, 255, 255});
if (((float)(adler32(&((Vec2){x, y}), sizeof (Vec2)) % 100) / 100) <= TREE_DENSITY)
draw_billboard("/assets/trreez.png",
(Vec3){ (float)x, d0 + 1.95f, (float)y },
(Vec2){2.f, 2.f},
(Rect){0},
(Color){255, 255, 255, 255}, true);
}
}
int32_t const rsi_g = (int32_t)GRASS_RADIUS * (int32_t)GRASS_RADIUS;
for (int32_t iy = -(int32_t)GRASS_RADIUS; iy <= (int32_t)GRASS_RADIUS - 1; ++iy) {
int32_t const dx = ceil_sqrt(rsi_g - (iy + (iy <= 0)) * (iy + (iy <= 0)));
for (int32_t ix = -dx; ix < dx; ++ix) {
int32_t lx = ix + TERRAIN_RADIUS;
int32_t ly = iy + TERRAIN_RADIUS;
float x = (float)(floorf(scn->pos.x - HALF_TERRAIN_DISTANCE + (float)lx));
float y = (float)(floorf(scn->pos.z - HALF_TERRAIN_DISTANCE + (float)ly));
float d = heightmap[lx][ly];
draw_billboard("/assets/grasses/25.png",
(Vec3){
(float)x + (float)((adler32(&((Vec2){x, y}), sizeof (Vec2))) % 32) / 64.0f,
d + 0.2f,
(float)y + (float)((adler32(&((Vec2){y, x}), sizeof (Vec2))) % 32) / 64.0f
},
(Vec2){0.4f, 0.4f},
(Rect){0},
(Color){255, 255, 255, 255}, true);
}
}
}
static void ingame_tick(State *state) {
SceneIngame *scn = (SceneIngame *)state->scene;
input_action("player_left", "A");
input_action("player_right", "D");
input_action("player_forward", "W");
input_action("player_backward", "S");
input_action("player_jump", "SPACE");
input_action("player_run", "LSHIFT");
input_action("mouse_capture_toggle", "ESCAPE");
input_action("toggle_camera_mode", "C");
if (scn->mouse_captured) {
const float sensitivity = 0.4f * (float)(M_PI / 180); /* TODO: put this in a better place */
scn->yaw += (float)ctx.mouse_movement.x * sensitivity;
scn->pitch -= (float)ctx.mouse_movement.y * sensitivity;
scn->pitch = clampf(scn->pitch, (float)-M_PI * 0.49f, (float)M_PI * 0.49f);
}
if (input_action_just_pressed("toggle_camera_mode"))
scn->camera_mode = scn->camera_mode == 2 ? 0 : scn->camera_mode + 1;
if (scn->camera_mode == 1) {
process_fly_mode(state);
} else if (scn->camera_mode == 0) {
process_ground_mode(state);
} else if (scn->camera_mode) {
process_vehicle_mode(state);
}
/* toggle mouse capture with end key */
if (input_action_just_pressed("mouse_capture_toggle"))
scn->mouse_captured = !scn->mouse_captured;
ctx.mouse_capture = scn->mouse_captured;
generate_terrain(scn);
process_vehicle(scn);
draw_terrain(scn);
draw_vehicle(scn);
draw_skybox("/assets/miramar/miramar_*.tga");
ctx.fog_color = (Color){ 140, 147, 160, 255 };
ctx.fog_density = 0.015f;
}
static void ingame_end(State *state) {
free(state->scene);
}
Scene *ingame_scene(State *state) {
(void)state;
SceneIngame *new_scene = calloc(1, sizeof *new_scene);
new_scene->base.tick = ingame_tick;
new_scene->base.end = ingame_end;
new_scene->mouse_captured = true;
m_audio(m_set(path, "music/woah.ogg"),
m_opt(channel, "soundtrack"),
m_opt(repeat, true));
new_scene->pos = (Vec3){ 0.1f, 0.0, 0.1f };
return (Scene *)new_scene;
}