nuclear@4: #include <float.h>
nuclear@4: #include <assert.h>
nuclear@4: #include <algorithm>
nuclear@4: #include "snode.h"
nuclear@4: 
nuclear@4: SceneNode::SceneNode()
nuclear@4: 	: scale(1, 1, 1)
nuclear@4: {
nuclear@4: 	parent = 0;
nuclear@4: }
nuclear@4: 
nuclear@4: SceneNode::SceneNode(Object *obj)
nuclear@4: 	: scale(1, 1, 1)
nuclear@4: {
nuclear@4: 	parent = 0;
nuclear@4: 	add_object(obj);
nuclear@4: }
nuclear@4: 
nuclear@4: void SceneNode::add_child(SceneNode *node)
nuclear@4: {
nuclear@4: 	if(node->parent) {
nuclear@4: 		if(node->parent == this) {
nuclear@4: 			return;
nuclear@4: 		}
nuclear@4: 		node->parent->remove_child(node);
nuclear@4: 	}
nuclear@4: 
nuclear@4: 	children.push_back(node);
nuclear@4: 	node->parent = this;
nuclear@4: }
nuclear@4: 
nuclear@4: bool SceneNode::remove_child(SceneNode *node)
nuclear@4: {
nuclear@4: 	auto it = std::find(children.begin(), children.end(), node);
nuclear@4: 	if(it != children.end()) {
nuclear@4: 		assert(node->parent == this);
nuclear@4: 		node->parent = 0;
nuclear@4: 		return true;
nuclear@4: 	}
nuclear@4: 	return false;
nuclear@4: }
nuclear@4: 
nuclear@4: int SceneNode::get_num_children() const
nuclear@4: {
nuclear@4: 	return (int)children.size();
nuclear@4: }
nuclear@4: 
nuclear@4: SceneNode *SceneNode::get_child(int idx) const
nuclear@4: {
nuclear@4: 	return children[idx];
nuclear@4: }
nuclear@4: 
nuclear@4: SceneNode *SceneNode::get_parent() const
nuclear@4: {
nuclear@4: 	return parent;
nuclear@4: }
nuclear@4: 
nuclear@4: void SceneNode::add_object(Object *obj)
nuclear@4: {
nuclear@4: 	if(std::find(this->obj.begin(), this->obj.end(), obj) == this->obj.end()) {
nuclear@4: 		this->obj.push_back(obj);
nuclear@4: 	}
nuclear@4: }
nuclear@4: 
nuclear@4: int SceneNode::get_num_objects() const
nuclear@4: {
nuclear@4: 	return (int)obj.size();
nuclear@4: }
nuclear@4: 
nuclear@4: Object *SceneNode::get_object(int idx) const
nuclear@4: {
nuclear@4: 	return obj[idx];
nuclear@4: }
nuclear@4: 
nuclear@4: void SceneNode::set_position(const Vector3 &pos)
nuclear@4: {
nuclear@4: 	this->pos = pos;
nuclear@4: }
nuclear@4: 
nuclear@4: void SceneNode::set_rotation(const Quaternion &rot)
nuclear@4: {
nuclear@4: 	this->rot = rot;
nuclear@4: }
nuclear@4: 
nuclear@4: void SceneNode::set_scaling(const Vector3 &scale)
nuclear@4: {
nuclear@4: 	this->scale = scale;
nuclear@4: }
nuclear@4: 
nuclear@4: 
nuclear@4: const Vector3 &SceneNode::get_node_position() const
nuclear@4: {
nuclear@4: 	return pos;
nuclear@4: }
nuclear@4: 
nuclear@4: const Quaternion &SceneNode::get_node_rotation() const
nuclear@4: {
nuclear@4: 	return rot;
nuclear@4: }
nuclear@4: 
nuclear@4: const Vector3 &SceneNode::get_node_scaling() const
nuclear@4: {
nuclear@4: 	return scale;
nuclear@4: }
nuclear@4: 
nuclear@4: 
nuclear@4: Vector3 SceneNode::get_position() const
nuclear@4: {
nuclear@4: 	return Vector3{0, 0, 0}.transformed(xform);
nuclear@4: }
nuclear@4: 
nuclear@4: Quaternion SceneNode::get_rotation() const
nuclear@4: {
nuclear@4: 	return rot;	// TODO
nuclear@4: }
nuclear@4: 
nuclear@4: Vector3 SceneNode::get_scaling() const
nuclear@4: {
nuclear@4: 	return scale;	// TODO
nuclear@4: }
nuclear@4: 
nuclear@4: 
nuclear@4: void SceneNode::update_node(long msec)
nuclear@4: {
nuclear@4: 	xform.reset_identity();
nuclear@4: 	xform.translate(pos);
nuclear@4: 	xform.rotate(rot);
nuclear@4: 	xform.scale(scale);
nuclear@4: 
nuclear@4: 	if(parent) {
nuclear@4: 		xform = parent->xform * xform;
nuclear@4: 	}
nuclear@4: 	inv_xform = xform.inverse();
nuclear@4: }
nuclear@4: 
nuclear@4: void SceneNode::update(long msec)
nuclear@4: {
nuclear@4: 	update_node(msec);
nuclear@4: 
nuclear@4: 	for(size_t i=0; i<children.size(); i++) {
nuclear@4: 		children[i]->update(msec);
nuclear@4: 	}
nuclear@4: }
nuclear@4: 
nuclear@4: 
nuclear@4: bool SceneNode::intersect(const Ray &ray, RayHit *hit) const
nuclear@4: {
nuclear@4: 	Ray local_ray = ray.transformed(inv_xform);
nuclear@4: 
nuclear@4: 	RayHit nearest;
nuclear@4: 	nearest.dist = FLT_MAX;
nuclear@4: 	for(size_t i=0; i<obj.size(); i++) {
nuclear@4: 		if(obj[i]->intersect(local_ray, hit)) {
nuclear@4: 			if(!hit) return true;
nuclear@4: 			if(hit->dist < nearest.dist) {
nuclear@4: 				nearest = *hit;
nuclear@4: 			}
nuclear@4: 		}
nuclear@4: 	}
nuclear@4: 
nuclear@4: 	if(nearest.dist < FLT_MAX) {
nuclear@4: 		*hit = nearest;
nuclear@4: 		hit->local_ray = local_ray;
nuclear@4: 		hit->world_ray = ray;
nuclear@4: 		return true;
nuclear@4: 	}
nuclear@4: 	return false;
nuclear@4: }