il_vec3 il_vec3_normal(const il_vec3 a, il_vec3 vec)
{
if (!vec) {
vec = il_vec3_new();
}
float len = il_vec3_len(a);
vec[0] = a[0]/len;
vec[1] = a[1]/len;
vec[2] = a[2]/len;
return vec;
}
il_vec3 il_vec4_to_vec3(const il_vec4 a, il_vec3 vec)
{
if (!vec) {
vec = il_vec3_new();
}
vec[0] = a[0] / a[3];
vec[1] = a[1] / a[3];
vec[2] = a[2] / a[3];
vec[3] = 1.0;
return vec;
}
il_vec3 il_vec3_cross(const il_vec3 a, const il_vec3 b, il_vec3 vec)
{
if (!vec) {
vec = il_vec3_new();
}
float n[3];
n[0] = a[1] * b[2] - b[1] * a[2];
n[1] = a[2] * b[0] - b[2] * a[0];
n[2] = a[0] * b[1] - b[0] * a[1];
vec[0] = n[0];
vec[1] = n[1];
vec[2] = n[2];
return vec;
}
il_vec3 il_vec3_rotate(const il_vec3 a, const il_quat q, il_vec3 vec)
{
if (!vec) {
vec = il_vec3_new();
}
/* From glm/gtc/quaternion.inl
typename detail::tquat<T>::value_type Two(2);
detail::tvec3<T> uv, uuv;
detail::tvec3<T> QuatVector(q.x, q.y, q.z);
uv = glm::cross(QuatVector, v);
uuv = glm::cross(QuatVector, uv);
uv *= (Two * q.w);
uuv *= Two;
return v + uv + uuv;
*/
il_vec3 uv, uuv, qv;
qv = il_vec3_set(NULL, q[0], q[1], q[2]);
uv = il_vec3_cross(qv, a, NULL);
uuv = il_vec3_cross(qv, uv, NULL);
uv[0] *= 2*q[3];
uv[1] *= 2*q[3];
uv[2] *= 2*q[3];
uuv[0] *= 2;
uuv[1] *= 2;
uuv[2] *= 2;
vec = il_vec3_add(a, uv, vec);
vec = il_vec3_add(vec, uuv, vec);
il_vec3_free(uv);
il_vec3_free(uuv);
il_vec3_free(qv);
return vec;
}
int main(int argc, char **argv)
{
demoLoad(argc, argv);
Window window = createWindow("Teapots");
Graphics graphics(window);
Graphics::Flags flags;
if (!graphics.init(flags)) {
return 1;
}
il_pos pos = il_pos_new(&graphics.space);
il_pos_setPosition(&pos, il_vec3_new(0, -4, 0));
Teapot teapot;
Teapots drawable(pos.id, teapot);
graphics.drawables.push_back(&drawable);
char *error;
if (!teapot.build(graphics.rm, &error)) {
il_error("Teapot: %s", error);
free(error);
return 1;
}
il_pos_setPosition(&graphics.space.camera, il_vec3_new(0, 0, 20));
il_pos lightp = il_pos_new(&graphics.space);
il_pos_setPosition(&lightp, il_vec3_new(20, 3, 20));
ilG_light lightl;
lightl.color = il_vec3_new(.8f*2, .7f*2, .2f*2);
lightl.radius = 50;
State state;
unsigned lightp_id = lightp.id;
state.sunlight_locs = &lightp_id;
state.sunlight_lights = &lightl;
state.sunlight_count = 1;
typedef std::chrono::steady_clock clock;
typedef std::chrono::duration<double> duration;
clock::time_point start = clock::now();
while (1) {
SDL_Event ev;
while (SDL_PollEvent(&ev)) {
switch (ev.type) {
case SDL_QUIT:
il_log("Stopping");
window.close();
return 0;
}
}
duration delta = clock::now() - start;
const double secs = 5.0;
const int scale = 20;
il_vec3 v;
v.x = float(sin(delta.count() * M_PI * 2.0 / secs) * scale);
v.y = 0.f;
v.z = float(cos(delta.count() * M_PI * 2.0 / secs) * scale);
il_quat q = il_quat_fromAxisAngle(0, 1, 0, float(delta.count() * M_PI * 2.0 / secs));
il_pos_setPosition(&graphics.space.camera, v);
il_pos_setRotation(&graphics.space.camera, q);
graphics.draw(state);
}
}
