X42_EXPORT bool X42_CALL x42_ApplyBoneOffsets( x42animLerp_t *lerp, const x42data_t *x42,
const x42boneOffset_t *offsets, uint numOffsets, x42opts_t *opts )
{
uint i, j;
REF_PARAM( opts );
#ifndef LIBX42_NO_PARAM_VALIDATION
demand_rf( lerp != NULL, X42_ERR_BADPTR, "lerp is NULL" );
demand_rf( x42 != NULL, X42_ERR_BADPTR, "x42 is NULL" );
demand_rf( x42_ValidateHeader( &x42->header ), X42_ERR_BADDATA, "invalid x42 header data" );
demand_rf( offsets != NULL, X42_ERR_BADPTR, "offsets is NULL" );
#endif
for( i = 0; i < numOffsets; i++ )
{
for( j = 0; j < x42->header.numBones; j++ )
{
if( x42name_eq2( x42, x42->bones[j].name, offsets[i].boneName ) )
break;
}
if( j == x42->header.numBones )
continue;
vec3_add( lerp->p[j], lerp->p[j], offsets[i].pos_offset );
vec3_add( lerp->s[j], lerp->s[j], offsets[i].scale_offset );
quat_mul( lerp->r[j], offsets[i].rot_offset, lerp->r[j] );
}
return true;
}
void object3d_render(screen_buffer *screen, object3d *obj) {
vec3 a, b, c;
int i;
for (i = 0; i < obj->vertex_cnt; i+=3) {
a = obj->vertices[i][0];
b = obj->vertices[i+1][0];
c = obj->vertices[i+2][0];
vec3_rotate(&a, &obj->rotation);
vec3_mul(&a, &obj->scale);
vec3_add(&a, &obj->position);
vec3_rotate(&b, &obj->rotation);
vec3_mul(&b, &obj->scale);
vec3_add(&b, &obj->position);
vec3_rotate(&c, &obj->rotation);
vec3_mul(&c, &obj->scale);
vec3_add(&c, &obj->position);
rasterize_vertex(screen, &a, &b, &c);
//line(screen, a.x, a.y, b.x, b.y, '+');
//line(screen, b.x, b.y, c.x, c.y, '+');
//line(screen, c.x, c.y, a.x, a.y, '+');
}
}
void collision_response_slide(void* x, vec3* position, vec3* velocity, collision (*colfunc)(void* x, vec3* pos, vec3* vel) ) {
collision col = colfunc(x, position, velocity);
int count = 0;
while (col.collided) {
//renderer_add(x, render_object_line(*position, vec3_add(*position, col.norm), vec3_red(), count+1));
if (count++ == 100) {
*velocity = vec3_zero();
break;
}
vec3 fwrd = vec3_mul(*velocity, col.time);
float len = max(vec3_length(fwrd) - 0.001, 0.0) / vec3_length(fwrd);
vec3 move = vec3_add(*position, vec3_mul(fwrd, len));
vec3 proj = vec3_project(vec3_mul(*velocity, (1.0-col.time)), col.norm);
//renderer_add(x, render_object_line(*position, vec3_add(*position, vec3_normalize(proj)), vec3_green(), count+1));
*position = move;
*velocity = proj;
col = colfunc(x, position, velocity);
}
*position = vec3_add(*position, *velocity);
}
void BillboardSprite::draw(Vec3 v)
{
v = quadrant_translate_position(current_camera_position, v);
if (!point_fulstrum_test(v.x, v.y, v.z))
return;
Vec3 up = vec3_init(model_view_matrix[0]*this->scale,
model_view_matrix[4]*this->scale,
model_view_matrix[8]*this->scale);
Vec3 right = vec3_init(model_view_matrix[1]*this->scale,
model_view_matrix[5]*this->scale,
model_view_matrix[9]*this->scale);
float tx_min, tx_max, ty_min, ty_max;
tx_min = (float)(this->texture_index%16)* (1.0f/16.0f);
tx_max = tx_min + (1.0f/16.0f);
ty_min = (float)(this->texture_index/16)* (1.0f/16.0f);
ty_max = ty_min + (1.0f/16.0f);
Vec3 p = vec3_sub(v, vec3_add(right, up));
glTexCoord2f(tx_min,ty_max);
glVertex3f(p.x, p.y, p.z);
p = vec3_add(v, vec3_sub(up, right));
glTexCoord2f(tx_max,ty_max);
glVertex3f(p.x, p.y, p.z);
p = vec3_add(v, vec3_add(up, right));
glTexCoord2f(tx_max,ty_min);
glVertex3f(p.x, p.y, p.z);
p = vec3_add(v, vec3_sub(right, up));
glTexCoord2f(tx_min,ty_min);
glVertex3f(p.x, p.y, p.z);
}
collision sphere_collide_face(sphere s, vec3 v, ctri ct) {
//if (unlikely(sphere_intersects_face(s, ct.a, ct.b, ct.c, ct.norm))) { error("Collision Sphere Inside Mesh Face!"); }
float angle = vec3_dot(ct.norm, v);
float dist = vec3_dot(ct.norm, vec3_sub(s.center, ct.a));
float t0 = ( s.radius - dist) / angle;
float t1 = (-s.radius - dist) / angle;
float t = FLT_MAX;
if (between_or(t0, 0, 1)
&& between_or(t1, 0, 1)) { t = min(t0, t1); }
else if (between_or(t0, 0, 1)) { t = t0; }
else if (between_or(t1, 0, 1)) { t = t1; }
else { return collision_none(); }
vec3 cpoint = vec3_add(s.center, vec3_mul(v, t));
vec3 spoint = vec3_add(cpoint, vec3_mul(ct.norm, -s.radius));
if (!point_inside_triangle(spoint, ct.a, ct.b, ct.c)) {
return collision_none();
} else {
return collision_new(t, spoint, ct.norm);
}
}
void _set_collision_point()
{
if (this->type == HITSCAN_TARGET_NONE)
{
const Vec3 away = vec3_scalar_mult(this->direction, this->range);
this->collision_point = vec3_add(this->start_position, away);
}
else if (this->type == HITSCAN_TARGET_BLOCK)
{
const Vec3 away = vec3_scalar_mult(this->direction, this->block_distance);
this->collision_point = vec3_add(this->start_position, away);
}
else if (this->type == HITSCAN_TARGET_MECH)
{
const Vec3 away = vec3_scalar_mult(this->direction, this->mech_distance);
this->collision_point = vec3_add(this->start_position, away);
}
else if (this->type == HITSCAN_TARGET_SPRITE_MOB)
{
this->collision_point = this->sprite_mob_collision_point;
}
else if (this->type == HITSCAN_TARGET_VOXEL)
{
this->collision_point = this->voxel_collision_point;
}
else
{
GS_ASSERT(false);
}
}
void camera_control_joyorbit(camera* c, float timestep) {
if (joystick_count() == 0) return;
SDL_Joystick* mainstick = joystick_get(0);
int x_move = SDL_JoystickGetAxis(mainstick, 0);
int y_move = SDL_JoystickGetAxis(mainstick, 1);
/* Dead Zone */
if (abs(x_move) < 10000) { x_move = 0; };
if (abs(y_move) < 10000) { y_move = 0; };
float a1 = (x_move / 32768.0) * -0.05;
float a2 = (y_move / 32768.0) * 0.05;
vec3 translation = c->target;
c->position = vec3_sub(c->position, translation);
c->target = vec3_sub(c->target, translation);
c->position = mat3_mul_vec3(mat3_rotation_y( a1 ), c->position );
vec3 axis = vec3_normalize(vec3_cross( vec3_sub(c->position, c->target) , vec3_new(0,1,0) ));
c->position = mat3_mul_vec3(mat3_rotation_axis_angle(axis, a2 ), c->position );
c->position = vec3_add(c->position, translation);
c->target = vec3_add(c->target, translation);
}
void camera_control_orbit(camera* c, SDL_Event e) {
float a1 = 0;
float a2 = 0;
vec3 axis;
vec3 translation = c->target;
c->position = vec3_sub(c->position, translation);
c->target = vec3_sub(c->target, translation);
switch(e.type) {
case SDL_MOUSEMOTION:
if (e.motion.state & SDL_BUTTON(1)) {
a1 = e.motion.xrel * -0.005;
a2 = e.motion.yrel * 0.005;
c->position = mat3_mul_vec3(mat3_rotation_y( a1 ), c->position );
axis = vec3_normalize(vec3_cross( vec3_sub(c->position, c->target) , vec3_new(0,1,0) ));
c->position = mat3_mul_vec3(mat3_rotation_angle_axis(a2, axis), c->position );
}
break;
case SDL_MOUSEWHEEL:
c->position = vec3_add(c->position, vec3_mul(vec3_normalize(c->position), -e.wheel.y));
break;
}
c->position = vec3_add(c->position, translation);
c->target = vec3_add(c->target, translation);
}
static Ray cam_ray_internal(Camera *cam, int i, int j, float offx, float offy,
double near)
{
Ray r;
float d, u, v;
double bottom, left, width, height;
const int nx = config->width, ny = config->height;
width = 2*near*tan(cam->fov*M_TWO_PI/360./2.);
left = -width/2;
height = width * ny/(double) nx;
bottom = -height/2;
d = near;
u = left + width *(i + offx)/nx;
v = bottom + height*(j + offy)/ny;
r.origin = cam->position;
r.direction = vec3_normalize(vec3_add(
vec3_scale(-d, cam->w), vec3_add(
vec3_scale( u, cam->u),
vec3_scale( v, cam->v))));
r.near = 0;
r.far = HUGE_VAL;
return r;
}
static int ray_sphere_intersect(Ray r, Sphere sph, float t[2], Vec3 normal[2])
{
Vec3 v;
float dd, vd, vv, discriminant;
float radius = sph.radius;
v = r.origin;
vv = vec3_dot(v, v);
vd = vec3_dot(v, r.direction);
dd = vec3_dot(r.direction, r.direction);
discriminant = vd*vd - dd*(vv - radius*radius);
if (discriminant < 0)
return 0;
else if (discriminant == 0)
{
t[0] = -vd/dd;
normal[0] = vec3_normalize(vec3_add(r.origin,
vec3_scale(t[0], r.direction)));
return 1;
} else
{
t[0] = (-vd - sqrtf(discriminant))/dd;
t[1] = (-vd + sqrtf(discriminant))/dd;
normal[0] = vec3_add(r.origin, vec3_scale(t[0], r.direction));
normal[1] = vec3_add(r.origin, vec3_scale(t[1], r.direction));
return 2;
}
}
static void _control_camera(Game* G, float delta_time)
{
if(G->num_points == 1) {
Vec2 curr = G->points[0].pos;
Vec2 delta = vec2_sub(curr, G->prev_single);
/* L-R rotation */
Quaternion q = quat_from_axis_anglef(0, 1, 0, delta_time*delta.x*0.2f);
G->camera.orientation = quat_multiply(G->camera.orientation, q);
/* U-D rotation */
q = quat_from_axis_anglef(1, 0, 0, delta_time*delta.y*0.2f);
G->camera.orientation = quat_multiply(q, G->camera.orientation);
G->prev_single = curr;
} else if(G->num_points == 2) {
float camera_speed = 0.1f;
Vec3 look = quat_get_z_axis(G->camera.orientation);
Vec3 right = quat_get_x_axis(G->camera.orientation);
Vec2 avg = vec2_add(G->points[0].pos, G->points[1].pos);
Vec2 delta;
avg = vec2_mul_scalar(avg, 0.5f);
delta = vec2_sub(avg, G->prev_double);
look = vec3_mul_scalar(look, -delta.y*camera_speed);
right = vec3_mul_scalar(right, delta.x*camera_speed);
G->camera.position = vec3_add(G->camera.position, look);
G->camera.position = vec3_add(G->camera.position, right);
G->prev_double = avg;
}
}
/* calculate sphere that goes through 4 points */
struct sphere* sphere_circum(struct sphere* rs, const struct vec4f* v0,
const struct vec4f* v1, const struct vec4f* v2, const struct vec4f* v3)
{
struct vec4f a;
vec3_sub(&a, v1, v0);
struct vec4f b;
vec3_sub(&b, v2, v0);
struct vec4f c;
vec3_sub(&c, v3, v0);
struct vec4f o;
struct vec4f tmp;
struct mat3f m;
mat3_setf(&m,
a.x, a.y, a.z,
b.x, b.y, b.z,
c.x, c.y, c.z,
0.0f, 0.0f, 0.0f);
float denom = 2.0f * mat3_det(&m);
vec3_muls(&o, vec3_cross(&tmp, &a, &b), vec3_dot(&c, &c));
vec3_add(&o, &o, vec3_muls(&tmp, vec3_cross(&tmp, &c, &a), vec3_dot(&b, &b)));
vec3_add(&o, &o, vec3_muls(&tmp, vec3_cross(&tmp, &b, &c), vec3_dot(&a, &a)));
vec3_muls(&o, &o, 1.0f/denom);
return sphere_setf(rs, v0->x + o.x, v0->y + o.y, v0->z + o.z, vec3_len(&o) + EPSILON);
}
/**
* Component of the support function for a cylinder collider.
**/
static void
object_support_component_cylinder(object_t *object,
float direction[3], float out[3])
{
float top[3] = { 0, object->h / 2, 0 };
float bottom[3] = { 0, -object->h / 2, 0 };
float axis[3];
float dir_perp[3];
float trans[16];
float dot_top;
object_get_transform_mat(object, trans);
/* Top and bottom are set to points in the middle of the top and the
* bottom faces of the cylinder respectively. We transform them to
* their worldspace positions.
*/
matrix_vec3_mul(trans, top, 1.0, top);
matrix_vec3_mul(trans, bottom, 1.0, bottom);
/* We get an axis vector that runs down the middle of the cylinder. */
vec3_subtract(top, bottom, axis);
/* Part of another process, but useful now for a reason... */
vec3_cross(axis, direction, dir_perp);
/* If the cross product is zero, our direction is aligned with the
* cylinder and top and bottom are our two final candidates.
*/
if (vec3_magnitude(dir_perp) > 0) {
/* This completes what we started with the last cross product.
* dir_perp is now a vector perpendicular to the cylinder's
* axis, but as close to our selected direction as possible.
*/
vec3_cross(dir_perp, axis, dir_perp);
/* Scale dir_perp to be the radius of our cylinder.
*/
vec3_normalize(dir_perp, dir_perp);
vec3_scale(dir_perp, dir_perp, object->r);
/* Finally, move top and bottom to the edges of our cylinder in
* the appropriate direction. We now have our two final
* candidates.
*/
vec3_add(dir_perp, top, top);
vec3_add(dir_perp, bottom, bottom);
}
/* We now have two candidates, top and bottom. We can just use largest
* dot product to determine which is furthest.
*/
dot_top = vec3_dot(top, direction);
if (dot_top > vec3_dot(bottom, direction))
memcpy(out, top, 3 * sizeof(float));
else
memcpy(out, bottom, 3 * sizeof(float));
}
static int on_move(gesture3d_t *gest, void *user)
{
float face_plane[4][4];
cursor_t *curs = gest->cursor;
tool_move_t *tool = user;
float n[3], pos[3], d[3], ofs[3], v[3];
layer_t *layer = goxel->image->active_layer;
float mat[4][4];
if (box_is_null(tool->box)) return GESTURE_FAILED;
if (gest->type == GESTURE_HOVER) {
goxel_set_help_text(goxel, "Drag to move face");
if (curs->snaped != SNAP_LAYER_OUT) return GESTURE_FAILED;
tool->snap_face = get_face(curs->normal);
curs->snap_offset = 0;
curs->snap_mask &= ~SNAP_ROUNDED;
mat4_mul(tool->box, FACES_MATS[tool->snap_face], face_plane);
render_img(&goxel->rend, NULL, face_plane, EFFECT_NO_SHADING);
if (curs->flags & CURSOR_PRESSED) {
gest->type = GESTURE_DRAG;
vec3_normalize(face_plane[0], v);
plane_from_vectors(goxel->tool_plane, curs->pos, curs->normal, v);
image_history_push(goxel->image);
}
return 0;
}
if (gest->type == GESTURE_DRAG) {
goxel_set_help_text(goxel, "Drag to move face");
curs->snap_offset = 0;
curs->snap_mask &= ~SNAP_ROUNDED;
mat4_mul(tool->box, FACES_MATS[tool->snap_face], face_plane);
vec3_normalize(face_plane[2], n);
vec3_sub(curs->pos, goxel->tool_plane[3], v);
vec3_project(v, n, v);
vec3_add(goxel->tool_plane[3], v, pos);
pos[0] = round(pos[0]);
pos[1] = round(pos[1]);
pos[2] = round(pos[2]);
vec3_add(tool->box[3], face_plane[2], d);
vec3_sub(pos, d, ofs);
vec3_project(ofs, n, ofs);
mat4_set_identity(mat);
mat4_itranslate(mat, ofs[0], ofs[1], ofs[2]);
do_move(layer, mat);
if (gest->state == GESTURE_END) {
gest->type = GESTURE_HOVER;
mat4_copy(plane_null, goxel->tool_plane);
}
return 0;
}
return 0;
}
void scotland_update() {
camera* cam = entity_get("camera");
light* sun = entity_get("sun");
static_object* skydome = entity_get("skydome");
landscape* world = entity_get("world");
sun_orbit += frame_time() * 0.01;
sun->position.x = 512 + sin(sun_orbit) * 512;
sun->position.y = cos(sun_orbit) * 512;
sun->position.z = 512;
sun->target = vec3_new(512, 0, 512);
if (w_held || s_held) {
vec3 cam_dir = vec3_normalize(vec3_sub(cam->target, cam->position));
float speed = 0.5;
if (!freecam) speed = 0.05;
if (w_held) {
cam->position = vec3_add(cam->position, vec3_mul(cam_dir, speed));
}
if (s_held) {
cam->position = vec3_sub(cam->position, vec3_mul(cam_dir, speed));
}
if (!freecam) {
float height = terrain_height(asset_hndl_ptr(world->terrain), vec2_new(cam->position.x, cam->position.z));
cam->position.y = height + 1;
}
cam->target = vec3_add(cam->position, cam_dir);
}
Uint8 keystate = SDL_GetMouseState(NULL, NULL);
if(keystate & SDL_BUTTON(1)){
float a1 = -(float)mouse_x * 0.005;
float a2 = (float)mouse_y * 0.005;
vec3 cam_dir = vec3_normalize(vec3_sub(cam->target, cam->position));
cam_dir.y += -a2;
vec3 side_dir = vec3_normalize(vec3_cross(cam_dir, vec3_new(0,1,0)));
cam_dir = vec3_add(cam_dir, vec3_mul(side_dir, -a1));
cam_dir = vec3_normalize(cam_dir);
cam->target = vec3_add(cam->position, cam_dir);
}
mouse_x = 0;
mouse_y = 0;
ui_button* framerate = ui_elem_get("framerate");
ui_button_set_label(framerate, frame_rate_string());
}
t_bool lambertian(t_material *material, const t_ray *r, const t_hit_record *h, t_vec3 *attenuation, t_ray *scattered)
{
(void)r;
t_vec3 target;
t_vec3 random;
random = random_in_unit_sphere(1.0f);
vec3_add(&target, vec3_add(&target, &h->normal, &h->pos), &random);
ray_assign(scattered, &h->pos, vec3_sub(&target, &target, &h->pos));
material->texture.value(&material->texture, h, attenuation);
return (TRUE);
}
void RailTrailEffect::draw_quad(const Vec3& p, float r, float theta, float phi) // quadratic radius
{ // with no rotation modifications, it faces upwards
static const float tx_min = 0.0f;
static const float tx_max = 1.0f;
static const float ty_min = 0.0f;
static const float ty_max = 1.0f;
Vec3 bl, tl, tr, br;
bl = tl = tr = br = vec3_init(0.0f);
// FIXME: MOVE SHIT LIKE THIS TO BE CALC'ED ONLY ONCE then applied to all the interpolated points
// rotate the y & z (pitch) .... prob need to reverse/mirror the y
float radian = phi*PI;
// first setup up-facing quad with correct PITCH
// bottom edge
bl.y = br.y = -r*sinf(radian);
bl.z = br.z = r*cosf(radian);
//printf("bl.y: %8.2f bl.z: %8.2f \n", bl.y, bl.z);
// top edge
tl.y = tr.y = r*sinf(radian);
tl.z = tr.z = -r*cosf(radian);
//printf("tl.y: %8.2f tl.z: %8.2f \n", tl.y, tl.z);
// sides
bl.x = tl.x = -r;
br.x = tr.x = r;
// do YAW
bl = vec3_euler_rotation(bl, theta-0.5f, 0, 0);
tl = vec3_euler_rotation(tl, theta-0.5f, 0, 0);
tr = vec3_euler_rotation(tr, theta-0.5f, 0, 0);
br = vec3_euler_rotation(br, theta-0.5f, 0, 0);
// translate to world space
bl = vec3_add(p, bl);
tl = vec3_add(p, tl);
tr = vec3_add(p, tr);
br = vec3_add(p, br);
// draw
glTexCoord2f(tx_max, ty_max);
glVertex3f(bl.x, bl.y, bl.z); // Bottom left
glTexCoord2f(tx_min, ty_max);
glVertex3f(tl.x, tl.y, tl.z); // Top left
glTexCoord2f(tx_min, ty_min);
glVertex3f(tr.x, tr.y, tr.z); // Top right
glTexCoord2f(tx_max, ty_min);
glVertex3f(br.x, br.y, br.z); // Bottom right
}
void OBSBasicPreview::SnapStretchingToScreen(vec3 &tl, vec3 &br)
{
uint32_t stretchFlags = (uint32_t)stretchHandle;
vec3 newTL = GetTransformedPos(tl.x, tl.y, itemToScreen);
vec3 newTR = GetTransformedPos(br.x, tl.y, itemToScreen);
vec3 newBL = GetTransformedPos(tl.x, br.y, itemToScreen);
vec3 newBR = GetTransformedPos(br.x, br.y, itemToScreen);
vec3 boundingTL;
vec3 boundingBR;
vec3_copy(&boundingTL, &newTL);
vec3_min(&boundingTL, &boundingTL, &newTR);
vec3_min(&boundingTL, &boundingTL, &newBL);
vec3_min(&boundingTL, &boundingTL, &newBR);
vec3_copy(&boundingBR, &newTL);
vec3_max(&boundingBR, &boundingBR, &newTR);
vec3_max(&boundingBR, &boundingBR, &newBL);
vec3_max(&boundingBR, &boundingBR, &newBR);
vec3 offset = GetScreenSnapOffset(boundingTL, boundingBR);
vec3_add(&offset, &offset, &newTL);
vec3_transform(&offset, &offset, &screenToItem);
vec3_sub(&offset, &offset, &tl);
if (stretchFlags & ITEM_LEFT)
tl.x += offset.x;
else if (stretchFlags & ITEM_RIGHT)
br.x += offset.x;
if (stretchFlags & ITEM_TOP)
tl.y += offset.y;
else if (stretchFlags & ITEM_BOTTOM)
br.y += offset.y;
}
// NB. Proportional x and y
Ray Camera::getRay(float x, float y){
vec3 xdir;
vec3 ydir;
vec3 dest;
xdir = vec3_scale(camx, (x-0.5) * tax);
ydir = vec3_scale(camy, (y-0.5) * tay);
dest = vec3_add(camz, vec3_add(xdir, ydir));
Ray r;
r.ro = location;
r.rd = dest;
return r;
}
/* Various intersection routines. The sphere and cylinder routines are the most
* mature. */
static int ray_plane_intersect(Ray ray, Plane plane, float t[1], Vec3 normal[1])
{
float test_t, alpha, beta, det;
Vec3 a = plane.edge1, b = plane.edge2, d = ray.direction, o = ray.origin;
Vec3 n, axn, bxn, pos;
/* This is basically Cramer's rule with vector calculus */
n = vec3_cross(a, b);
test_t = -vec3_dot(o, n)/vec3_dot(d, n);
pos = vec3_add(o, vec3_scale(test_t, d));
axn = vec3_cross(a, n);
bxn = vec3_cross(b, n);
det = vec3_dot(a, bxn);
alpha = vec3_dot(pos, bxn)/det;
beta = -vec3_dot(pos, axn)/det;
if (alpha < 0 || alpha > 1 || beta < 0 || beta > 1)
return 0;
t[0] = test_t;
if (vec3_dot(d, n) < 0)
normal[0] = n;
else
normal[0] = vec3_scale(-1, n);
return 1;
}
void generate_debug_geometry(vector_buffer *vertices, vector_buffer *normals, geometry* out)
{
float temp[3];
vector_buffer debug;
vector_init(&debug);
for(int i = 0; i < out->vertex_count; ++i)
{
vec3_scale(vector_get(normals, i), 0.05f, temp);
vec3_add(vector_get(vertices, i), temp, temp);
vector_append(&debug, vector_get(vertices, i));
vector_append(&debug, temp);
}
out->debug_geometry.attributes.position = 3;
make_buffer(out->debug_geometry.attributes.position, &out->debug_geometry.vertex_buffer, debug.data , (GLsizei) (out->vertex_count * 3 * 2 * sizeof(float)));
out->debug_geometry.vertex_shader = make_shader(GL_VERTEX_SHADER, "shaders/debug_shader.v.glsl");
out->debug_geometry.fragment_shader = make_shader(GL_FRAGMENT_SHADER, "shaders/debug_shader.f.glsl");
out->debug_geometry.program = make_program(out->debug_geometry.vertex_shader, out->debug_geometry.fragment_shader);
glBindAttribLocation(out->debug_geometry.program, out->debug_geometry.attributes.position, "position");
glLinkProgram(out->debug_geometry.program);
out->debug_geometry.uniform.mvp_matrix = glGetUniformLocation(out->program, "mvp_matrix");
}
static vec4_t fragment_shader(const vs_to_fs_t *in)
{
vec3_t result = { 0, 0, 0 };
//eye position
const vec3_t E = { 0, 0, 1 };
const float ambient = 0.05f;
float diffuse, specular;
vec3_t N = vec3_normalize(in->normal);
int i;
for(i=0; i<sizeof(lights)/sizeof(light_t); i++){
vec3_t H = vec3_normalize(vec3_add(E, lights[i].position));
diffuse = vec3_dot(N, lights[i].position);
specular = vec3_dot(N, H);
specular *= specular;
specular *= specular;
specular *= specular;
specular *= specular;
specular *= specular;
specular *= specular * 0.6f;
vec3_t c = r3d_texture_nearest(textures[mesh], in->uv); // read texel
result.r += diffuse * c.r * lights[i].color.r + specular;
result.g += diffuse * c.g * lights[i].color.g + specular;
result.b += diffuse * c.b * lights[i].color.b + specular;
}
return vec4(ambient + result.r, ambient + result.g, ambient + result.b, 1.0f);
}
static void toggle_freecam(ui_button* b, SDL_Event event) {
if (event.type == SDL_MOUSEBUTTONDOWN) {
if (ui_button_contains_position(b, vec2_new(event.motion.x, event.motion.y))) {
b->pressed = true;
}
} else if (event.type == SDL_MOUSEBUTTONUP) {
if (b->pressed) {
b->pressed = false;
freecam = !freecam;
camera* cam = entity_get("camera");
landscape* world = entity_get("world");
vec3 cam_dir = vec3_normalize(vec3_sub(cam->target, cam->position));
float height = terrain_height(asset_hndl_ptr(world->terrain), vec2_new(cam->position.x, cam->position.z));
cam->position.y = height + 1;
cam->target = vec3_add(cam->position, cam_dir);
}
}
}
collision sphere_collide_edge(sphere s, vec3 v, vec3 e0, vec3 e1) {
//Wif (unlikely(!line_outside_sphere(s, e0, e1))) { error("Collision Sphere Inside Mesh Edge!"); }
vec3 x0 = vec3_sub(e0, s.center);
vec3 x1 = vec3_sub(e1, s.center);
vec3 d = vec3_sub(x1, x0);
float dlen = vec3_length_sqrd(d);
float vlen = vec3_length_sqrd(v);
float xlen = vec3_length_sqrd(x0);
float A = dlen * -vlen + vec3_dot(d, v) * vec3_dot(d, v);
float B = dlen * 2 * vec3_dot(v, x0) - 2 * vec3_dot(d, v) * vec3_dot(d, x0);
float C = dlen * (s.radius * s.radius - xlen) + vec3_dot(d, x0) * vec3_dot(d, x0);
float t0, t1, t;
if (!quadratic(A, B, C, &t0, &t1)) { return collision_none(); }
if (between_or(t0, 0, 1) && between_or(t1, 0, 1)) { t = min(t0, t1); }
else if (between_or(t0, 0, 1)) { t = t0; }
else if (between_or(t1, 0, 1)) { t = t1; }
else { return collision_none(); }
float range = (vec3_dot(d, v) * t - vec3_dot(d, x0)) / dlen;
if (!between_or(range, 0, 1)) {
return collision_none();
} else {
vec3 spoint = vec3_add(e0, vec3_mul(d, range));
return collision_new(t, spoint, vec3_normalize(vec3_sub(s.center, spoint)));
}
}
collision point_collide_edge(vec3 p, vec3 v, vec3 e0, vec3 e1) {
vec3 x0 = vec3_sub(e0, p);
vec3 x1 = vec3_sub(e1, p);
vec3 d = vec3_sub(x1, x0);
float dlen = vec3_length_sqrd(d);
float vlen = vec3_length_sqrd(v);
float xlen = vec3_length_sqrd(x0);
float A = dlen * -vlen + vec3_dot(d, v) * vec3_dot(d, v);
float B = dlen * 2 * vec3_dot(v, x0) - 2 * vec3_dot(d, v) * vec3_dot(d, x0);
float C = dlen * - xlen + vec3_dot(d, x0) * vec3_dot(d, x0);
float t0, t1, t;
if (!quadratic(A, B, C, &t0, &t1)) { return collision_none(); }
if (between_or(t0, 0, 1) && between_or(t1, 0, 1)) { t = min(t0, t1); }
else if (between_or(t0, 0, 1)) { t = t0; }
else if (between_or(t1, 0, 1)) { t = t1; }
else { return collision_none(); }
float range = (vec3_dot(d, v) * t - vec3_dot(d, x0)) / dlen;
if (!between_or(range, 0, 1)) {
return collision_none();
} else {
vec3 spoint = vec3_add(e0, vec3_mul(d, range));
return collision_new(t, spoint, vec3_normalize(vec3_sub(p, spoint)));
}
}
static int _llfunc_vec3_add(lua_State *L) {
vec3 *a = (vec3*)userdata_get_or_die(L, 1);
vec3 *b = (vec3*)userdata_get_or_die(L, 2);
vec3 *r = (vec3*)userdata_get_or_new(L, 3, sizeof(vec3));
vec3_add(a, b, r);
return 1;
}
void trace_image(int width, int height, float aspect, unsigned char *image, const world* world, const vec3& light_dir)
{
#pragma omp parallel for schedule(dynamic)
for(int yloop = 0; yloop < height; yloop++) {
unsigned char *row = image + (height - yloop - 1) * (((width * 3) + 3) & ~3);
for(int xloop = 0; xloop < width; xloop++) {
// printf("%d, %d\n", xloop, yloop);
int cols = 0;
vec3 color(0, 0, 0);
for(int qky = 0; qky < world->ysub; qky++) {
for(int qkx = 0; qkx < world->xsub; qkx++) {
float u = ((xloop + qkx / (float)world->xsub) + .5) / width;
float v = ((yloop + qky / (float)world->ysub) + .5) / height;
ray eye_ray;
eye_ray.d = make_eye_ray(u, v, aspect, world->cam.fov);
eye_ray.o = vec3(0, 0, 0);
ray world_ray = transform_ray(eye_ray, world->camera_matrix, world->camera_normal_matrix);
vec3 sample = trace(world_ray, world, light_dir);
color = vec3_add(color, sample);
++cols;
}
}
vec3 final_color = vec3_divide(color, cols);
unsigned char *pixel = row + xloop * 3;
pixel[0] = final_color.x * 255;
pixel[1] = final_color.y * 255;
pixel[2] = final_color.z * 255;
}
}
}
void calc_torque(struct vec3 *dst, const struct vec3 *v1,
const struct vec3 *v2, float torque, float min_adjust,
float t)
{
struct vec3 line, dir;
float orig_dist, torque_dist, adjust_dist;
if (vec3_close(v1, v2, EPSILON)) {
vec3_copy(dst, v1);
return;
}
vec3_sub(&line, v2, v1);
orig_dist = vec3_len(&line);
vec3_mulf(&dir, &line, 1.0f/orig_dist);
torque_dist = orig_dist*torque; /* use distance to determine speed */
if (torque_dist < min_adjust) /* prevent from going too slow */
torque_dist = min_adjust;
adjust_dist = torque_dist*t;
if (adjust_dist <= (orig_dist-LARGE_EPSILON)) {
vec3_mulf(dst, &dir, adjust_dist);
vec3_add(dst, dst, v1); /* add torque */
} else {
vec3_copy(dst, v2); /* clamp if overshoot */
}
}
void foreach_block_in_hiearchy(
struct group *group,
struct vec3 const *parentpos,
void (*proc)(struct blockref*, struct vec3 const *pos, void*),
void *data)
{
vec3 pos;
vec3_add(&pos, parentpos, &group->position);
struct groupdata *groupdata = group->data;
struct ptrarray *blocks = groupdata->blocks;
size_t blockcount = ptrarray_count(blocks);
struct blockref ref = {NULL, group};
for (size_t i = 0; i < blockcount; ++i)
{
ref.block = get_ptrarray(blocks, i);
proc(&ref, &pos, data);
}
struct ptrarray *groups = groupdata->groups;
size_t groupcount = ptrarray_count(groups);
for (size_t i = 0; i < groupcount; ++i)
{
struct group *child = get_ptrarray(groups, i);
foreach_block_in_hiearchy(child, &pos, proc, data);
}
}
int collision_test_sphere(t_ray_result *r,
t_sphere *sphere)
{
t_real a;
t_real b;
t_real c;
t_real det;
a = collision_test_sphere_a(&r->ray.direction);
b = collision_test_sphere_b(&r->ray, &sphere->position);
c = collision_test_sphere_c(&r->ray, sphere);
det = ft_pow(b, 2) - (4 * a * c);
if (!det)
r->distance = -(b / 2 * a);
else if (det > 0)
r->distance = FT_MIN((-b - sqrt(det)) / (2 * a),
(-b + sqrt(det)) / (2 * a));
else
return (0);
r->hit = OT_SPHERE;
r->contact.point = vec3_add(r->ray.origin,
vec3_scale(r->ray.direction, r->distance));
return (1);
}