text: /*************************************************************************/
  /*  camera.cpp                                                           */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                    http://www.godotengine.org                         */
  /*************************************************************************/
  /* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  #include "camera.h"
  
  #include "camera_matrix.h"
  #include "scene/resources/material.h"
  #include "scene/resources/surface_tool.h"
  
  
  void Camera::_update_audio_listener_state() {
  
  
  }
  
  void Camera::_request_camera_update() {
  
  	_update_camera();
  }
  
  void Camera::_update_camera_mode() {
  
  
  	force_change=true;
  	switch(mode) {
  		case PROJECTION_PERSPECTIVE: {
  
  
  			set_perspective(fov,near,far);
  
  		} break;
  		case PROJECTION_ORTHOGONAL: {
  			set_orthogonal(size,near,far);
  		} break;	
  	
  	}
  
  }
  
  bool Camera::_set(const StringName& p_name, const Variant& p_value) {
  
  	bool changed_all=false;
  	if (p_name=="projection") {
  
  		int proj = p_value;
  		if (proj==PROJECTION_PERSPECTIVE)
  			mode=PROJECTION_PERSPECTIVE;
  		if (proj==PROJECTION_ORTHOGONAL)
  			mode=PROJECTION_ORTHOGONAL;
  
  		changed_all=true;
  	} else if (p_name=="fov" || p_name=="fovy" || p_name=="fovx")
  		fov=p_value;
  	else if (p_name=="size" || p_name=="sizex" || p_name=="sizey")
  		size=p_value;
  	else if (p_name=="near")
  		near=p_value;
  	else if (p_name=="far")
  		far=p_value;														
  	else if (p_name=="keep_aspect")
  		set_keep_aspect_mode(KeepAspect(int(p_value)));
  	else if (p_name=="vaspect")
  		set_keep_aspect_mode(p_value?KEEP_WIDTH:KEEP_HEIGHT);
  	else if (p_name=="current") {
  		if (p_value.operator bool()) {
  			make_current();
  		} else {
  			clear_current();
  		}
  	} else if (p_name=="visible_layers") {
  		set_visible_layers(p_value);
  	} else if (p_name=="environment") {
  		set_environment(p_value);
  	} else
  		return false;
  		
  	_update_camera_mode();
  	if (changed_all)
  		_change_notify();
  	return true;
  
  }
  bool Camera::_get(const StringName& p_name,Variant &r_ret) const {
  
  	if (p_name=="projection") {
  		r_ret= mode;
  	} else if (p_name=="fov" || p_name=="fovy" || p_name=="fovx")
  		r_ret= fov;
  	else if (p_name=="size" || p_name=="sizex" || p_name=="sizey")
  		r_ret= size;
  	else if (p_name=="near")
  		r_ret= near;
  	else if (p_name=="far")
  		r_ret= far;
  	else if (p_name=="keep_aspect")
  		r_ret= int(keep_aspect);
  	else if (p_name=="current") {
  
  		if (is_inside_tree() && get_tree()->is_editor_hint()) {
  			r_ret=current;
  		} else {
  			r_ret=is_current();
  		}
  	} else if (p_name=="visible_layers") {
  		r_ret=get_visible_layers();
  	} else if (p_name=="environment") {
  		r_ret=get_environment();
  	} else
  		return false;
  
  	return true;
  }
  
  void Camera::_get_property_list( List<PropertyInfo> *p_list) const {
  
  	p_list->push_back( PropertyInfo( Variant::INT, "projection", PROPERTY_HINT_ENUM, "Perspective,Orthogonal") );
  	
  	switch(mode) {
  	
  		case PROJECTION_PERSPECTIVE: {
  		
  			p_list->push_back( PropertyInfo( Variant::REAL, "fov" , PROPERTY_HINT_RANGE, "1,89,0.1",PROPERTY_USAGE_NOEDITOR) );
  			if (keep_aspect==KEEP_WIDTH)
  				p_list->push_back( PropertyInfo( Variant::REAL, "fovx" , PROPERTY_HINT_RANGE, "1,89,0.1",PROPERTY_USAGE_EDITOR) );
  			else
  				p_list->push_back( PropertyInfo( Variant::REAL, "fovy" , PROPERTY_HINT_RANGE, "1,89,0.1",PROPERTY_USAGE_EDITOR) );
  
  			
  		} break;
  		case PROJECTION_ORTHOGONAL: {
  		
  			p_list->push_back( PropertyInfo( Variant::REAL, "size" , PROPERTY_HINT_RANGE, "1,16384,0.01",PROPERTY_USAGE_NOEDITOR ) );
  			if (keep_aspect==KEEP_WIDTH)
  				p_list->push_back( PropertyInfo( Variant::REAL, "sizex" , PROPERTY_HINT_RANGE, "0.1,16384,0.01",PROPERTY_USAGE_EDITOR) );
  			else
  				p_list->push_back( PropertyInfo( Variant::REAL, "sizey" , PROPERTY_HINT_RANGE, "0.1,16384,0.01",PROPERTY_USAGE_EDITOR) );
  
  		} break;
  	
  	}
  	
  	p_list->push_back( PropertyInfo( Variant::REAL, "near" , PROPERTY_HINT_EXP_RANGE, "0.01,4096.0,0.01") );
  	p_list->push_back( PropertyInfo( Variant::REAL, "far" , PROPERTY_HINT_EXP_RANGE, "0.01,4096.0,0.01") );
  	p_list->push_back( PropertyInfo( Variant::INT, "keep_aspect",PROPERTY_HINT_ENUM,"Keep Width,Keep Height") );
  	p_list->push_back( PropertyInfo( Variant::BOOL, "current" ) );
  	p_list->push_back( PropertyInfo( Variant::INT, "visible_layers",PROPERTY_HINT_ALL_FLAGS ) );
  	p_list->push_back( PropertyInfo( Variant::OBJECT, "environment",PROPERTY_HINT_RESOURCE_TYPE,"Environment" ) );
  
  }
  
  void Camera::_update_camera() {
  
  	Transform tr = get_camera_transform();
  	VisualServer::get_singleton()->camera_set_transform( camera, tr );
  
  // here goes listener stuff
  //	if (viewport_ptr && is_inside_scene() && is_current())
  //		viewport_ptr->_camera_transform_changed_notify();
  
  	if (is_inside_tree() && is_current()) {
  		if (viewport_ptr) {
  			viewport_ptr->_camera_transform_changed_notify();
  		}
  	}
  
  	if (is_current() && get_world().is_valid()) {
  		get_world()->_update_camera(this);
  	}
  
  
  }
  
  void Camera::_notification(int p_what) {
  
  	switch(p_what) {
  	
  		case NOTIFICATION_ENTER_WORLD: {
  
  			viewport_ptr=NULL;
  
  			{ //find viewport stuff
  				Node *parent=get_parent();
  
  				while(parent) {
  
  					Viewport* viewport = parent->cast_to<Viewport>();
  
  					if (viewport) {
  						viewport_ptr=viewport;
  						break;
  					}
  					parent=parent->get_parent();
  				}
  
  			}
  
  			camera_group = "_vp_cameras"+itos(get_viewport()->get_instance_ID());
  			add_to_group(camera_group);
  			if (viewport_ptr)
  				viewport_ptr->cameras.insert(this);
  			if (current)
  				make_current();
  
  
  		} break;			
  		case NOTIFICATION_TRANSFORM_CHANGED: {
  		
  			_request_camera_update();
  		} break;
  		case NOTIFICATION_EXIT_WORLD: {
  		
  			if (is_current()) {
  				clear_current();
  				current=true; //keep it true
  
  			} else {
  				current=false;
  			}
  			if (viewport_ptr)
  				viewport_ptr->cameras.erase(this);
  			viewport_ptr=NULL;
  			remove_from_group(camera_group);
  
  
  		} break;
  		case NOTIFICATION_BECAME_CURRENT: {
  			if (get_world().is_valid()) {
  				get_world()->_register_camera(this);
  			}
  		} break;
  		case NOTIFICATION_LOST_CURRENT: {
  			if (get_world().is_valid()) {
  				get_world()->_remove_camera(this);
  			}
  		} break;
  
  	
  	}
  
  }
  
  
  Transform Camera::get_camera_transform() const {
  
  	return get_global_transform().orthonormalized();
  }
  
  void Camera::set_perspective(float p_fovy_degrees, float p_z_near, float p_z_far) {
  
  	if (!force_change && fov==p_fovy_degrees && p_z_near==near && p_z_far==far && mode==PROJECTION_PERSPECTIVE)
  		return;
  
  	fov=p_fovy_degrees;
  	near=p_z_near;
  	far=p_z_far;
  	mode=PROJECTION_PERSPECTIVE;
  	
  	VisualServer::get_singleton()->camera_set_perspective(camera,fov,near,far);
  	update_gizmo();
  	force_change=false;
  }
  void Camera::set_orthogonal(float p_size, float p_z_near, float p_z_far) {
  
  	if (!force_change && size==p_size && p_z_near==near && p_z_far==far && mode==PROJECTION_ORTHOGONAL)
  		return;
  
  	size = p_size;
  	
  	near=p_z_near;
  	far=p_z_far;
  	mode=PROJECTION_ORTHOGONAL;
  	force_change=false;
  	
  	VisualServer::get_singleton()->camera_set_orthogonal(camera,size,near,far);
  	update_gizmo();
  }
  
  RID Camera::get_camera() const {
  
  	return camera;
  };
  
  void Camera::make_current() {
  
  	current=true;
  
  	if (!is_inside_tree())
  		return;
  
  	if (viewport_ptr) {
  		viewport_ptr->_set_camera(this);
  	}
  
  	//get_scene()->call_group(SceneMainLoop::GROUP_CALL_REALTIME,camera_group,"_camera_make_current",this);
  }
  
  
  void Camera::_camera_make_next_current(Node *p_exclude) {
  
  	if (this==p_exclude)
  		return;
  	if (!is_inside_tree())
  		return;
  	if (get_viewport()->get_camera()!=NULL)
  		return;
  
  	make_current();
  }
  
  
  void Camera::clear_current() {
  
  	current=false;
  	if (!is_inside_tree())
  		return;
  
  	if (viewport_ptr) {
  		if (viewport_ptr->get_camera()==this) {
  			viewport_ptr->_set_camera(NULL);
  			//a group is used beause this needs to be in order to be deterministic
  			get_tree()->call_group(SceneTree::GROUP_CALL_REALTIME,camera_group,"_camera_make_next_current",this);
  
  		}
  	}
  
  }
  
  bool Camera::is_current() const {
  
  	if (is_inside_tree()) {
  		if (viewport_ptr)
  			return viewport_ptr->get_camera()==this;
  	} else
  		return current;
  
  	return false;
  }
  
  
  bool Camera::_can_gizmo_scale() const {
  
  	return false;
  }
  
  
  RES Camera::_get_gizmo_geometry() const {
  
  
  	Ref<SurfaceTool> surface_tool( memnew( SurfaceTool ));
  
  	Ref<FixedMaterial> mat( memnew( FixedMaterial ));
  
  	mat->set_parameter( FixedMaterial::PARAM_DIFFUSE,Color(1.0,0.5,1.0,0.5) );
  	mat->set_line_width(4);
  	mat->set_flag(Material::FLAG_DOUBLE_SIDED,true);
  	mat->set_flag(Material::FLAG_UNSHADED,true);
  	//mat->set_hint(Material::HINT_NO_DEPTH_DRAW,true);
  
  	surface_tool->begin(Mesh::PRIMITIVE_LINES);
  	surface_tool->set_material(mat);
  
  	switch(mode) {
  
  		case PROJECTION_PERSPECTIVE: {
  
  
  
  			Vector3 side=Vector3( Math::sin(Math::deg2rad(fov)), 0, -Math::cos(Math::deg2rad(fov)) );
  			Vector3 nside=side;
  			nside.x=-nside.x;
  			Vector3 up=Vector3(0,side.x,0);
  
  
  #define ADD_TRIANGLE( m_a, m_b, m_c)\
  {\
  	surface_tool->add_vertex(m_a);\
  	surface_tool->add_vertex(m_b);\
  	surface_tool->add_vertex(m_b);\
  	surface_tool->add_vertex(m_c);\
  	surface_tool->add_vertex(m_c);\
  	surface_tool->add_vertex(m_a);\
  }
  
  			ADD_TRIANGLE( Vector3(), side+up, side-up );
  			ADD_TRIANGLE( Vector3(), nside+up, nside-up );
  			ADD_TRIANGLE( Vector3(), side+up, nside+up );
  			ADD_TRIANGLE( Vector3(), side-up, nside-up );
  
  			side.x*=0.25;
  			nside.x*=0.25;
  			Vector3 tup( 0, up.y*3/2,side.z);
  			ADD_TRIANGLE( tup, side+up, nside+up );
  
  		} break;
  		case PROJECTION_ORTHOGONAL: {
  
  #define ADD_QUAD( m_a, m_b, m_c, m_d)\
  {\
  	surface_tool->add_vertex(m_a);\
  	surface_tool->add_vertex(m_b);\
  	surface_tool->add_vertex(m_b);\
  	surface_tool->add_vertex(m_c);\
  	surface_tool->add_vertex(m_c);\
  	surface_tool->add_vertex(m_d);\
  	surface_tool->add_vertex(m_d);\
  	surface_tool->add_vertex(m_a);\
  }
  
  			float hsize=size*0.5;
  			Vector3 right(hsize,0,0);
  			Vector3 up(0,hsize,0);
  			Vector3 back(0,0,-1.0);
  			Vector3 front(0,0,0);
  
  			ADD_QUAD( -up-right,-up+right,up+right,up-right);
  			ADD_QUAD( -up-right+back,-up+right+back,up+right+back,up-right+back);
  			ADD_QUAD( up+right,up+right+back,up-right+back,up-right);
  			ADD_QUAD( -up+right,-up+right+back,-up-right+back,-up-right);
  
  			right.x*=0.25;
  			Vector3 tup( 0, up.y*3/2,back.z );
  			ADD_TRIANGLE( tup, right+up+back, -right+up+back );
  
  		} break;
  
  	}
  
  	return surface_tool->commit();
  
  }
  
  Vector3 Camera::project_ray_normal(const Point2& p_pos) const {
  
  	Vector3 ray = project_local_ray_normal(p_pos);
  	return get_camera_transform().basis.xform(ray).normalized();
  };
  
  Vector3 Camera::project_local_ray_normal(const Point2& p_pos) const {
  
  	if (!is_inside_tree()) {
  		ERR_EXPLAIN("Camera is not inside scene.");
  		ERR_FAIL_COND_V(!is_inside_tree(),Vector3());
  	}
  
  
  #if 0
  	Size2 viewport_size = viewport_ptr->get_visible_rect().size;
  	Vector2 cpos = p_pos;
  #else
  
  	Size2 viewport_size = viewport_ptr->get_camera_rect_size();
  	Vector2 cpos = viewport_ptr->get_camera_coords(p_pos);
  #endif
  
  	Vector3 ray;
  
  	if (mode==PROJECTION_ORTHOGONAL) {
  
  		ray=Vector3(0,0,-1);
  	} else {
  		CameraMatrix cm;
  		cm.set_perspective(fov,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  		float screen_w,screen_h;
  		cm.get_viewport_size(screen_w,screen_h);
  		ray=Vector3( ((cpos.x/viewport_size.width)*2.0-1.0)*screen_w, ((1.0-(cpos.y/viewport_size.height))*2.0-1.0)*screen_h,-near).normalized();
  	}
  
  	return ray;
  };
  
  
  Vector3 Camera::project_ray_origin(const Point2& p_pos) const {
  
  	if (!is_inside_tree()) {
  		ERR_EXPLAIN("Camera is not inside scene.");
  		ERR_FAIL_COND_V(!is_inside_tree(),Vector3());
  	}
  
  #if 0
  	Size2 viewport_size = viewport_ptr->get_visible_rect().size;
  	Vector2 cpos = p_pos;
  #else
  
  	Size2 viewport_size = viewport_ptr->get_camera_rect_size();
  	Vector2 cpos = viewport_ptr->get_camera_coords(p_pos);
  #endif
  
  	ERR_FAIL_COND_V( viewport_size.y == 0, Vector3() );
  //	float aspect = viewport_size.x / viewport_size.y;
  
  	if (mode == PROJECTION_PERSPECTIVE) {
  
  		return get_camera_transform().origin;
  	} else {
  
  		Vector2 pos = cpos / viewport_size;
  		float vsize,hsize;
  		if (keep_aspect==KEEP_WIDTH) {
  			vsize = size/viewport_size.get_aspect();
  			hsize = size;
  		} else {
  			hsize = size*viewport_size.get_aspect();
  			vsize = size;
  
  		}
  
  		Vector3 ray;
  		ray.x = pos.x * (hsize) - hsize/2;
  		ray.y = (1.0 - pos.y) * (vsize) - vsize/2;
  		ray.z = -near;
  		ray = get_camera_transform().xform(ray);
  		return ray;
  	};
  };
  
  Point2 Camera::unproject_position(const Vector3& p_pos) const {
  
  	if (!is_inside_tree()) {
  		ERR_EXPLAIN("Camera is not inside scene.");
  		ERR_FAIL_COND_V(!is_inside_tree(),Vector2());
  	}
  
  	Size2 viewport_size = viewport_ptr->get_visible_rect().size;
  
  	CameraMatrix cm;
  
  
  	if (mode==PROJECTION_ORTHOGONAL)
  		cm.set_orthogonal(size,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  	else
  		cm.set_perspective(fov,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  
  	Plane p(get_camera_transform().xform_inv(p_pos),1.0);
  
  	p=cm.xform4(p);
  	p.normal/=p.d;
  
  
  	Point2 res;
  	res.x = (p.normal.x * 0.5 + 0.5)  * viewport_size.x;
  	res.y = (-p.normal.y * 0.5 + 0.5)  * viewport_size.y;
  
  	return res;
  
  }
  
  Vector3 Camera::project_position(const Point2& p_point) const {
  
  	if (!is_inside_tree()) {
  		ERR_EXPLAIN("Camera is not inside scene.");
  		ERR_FAIL_COND_V(!is_inside_tree(),Vector3());
  	}
  
  	Size2 viewport_size = viewport_ptr->get_visible_rect().size;
  
  	CameraMatrix cm;
  
  	if (mode==PROJECTION_ORTHOGONAL)
  		cm.set_orthogonal(size,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  	else
  		cm.set_perspective(fov,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  
  	Size2 vp_size;
  	cm.get_viewport_size(vp_size.x,vp_size.y);
  
  	Vector2 point;
  	point.x = (p_point.x/viewport_size.x) * 2.0 - 1.0;
  	point.y = (p_point.y/viewport_size.y) * 2.0 - 1.0;
  	point*=vp_size;
  
  	Vector3 p(point.x,point.y,-near);
  
  
  	return get_camera_transform().xform(p);
  }
  
  /*
  void Camera::_camera_make_current(Node *p_camera) {
  
  
  	if (p_camera==this) {
  		VisualServer::get_singleton()->viewport_attach_camera(viewport_id,camera);
  		active=true;
  	} else {
  		if (active && p_camera==NULL) {
  			//detech camera because no one else will claim it
  			VisualServer::get_singleton()->viewport_attach_camera(viewport_id,RID());
  		}
  		active=false;
  	}
  }
  */
  
  void Camera::set_environment(const Ref<Environment>& p_environment) {
  
  	environment=p_environment;
  	if (environment.is_valid())
  		VS::get_singleton()->camera_set_environment(camera,environment->get_rid());
  	else
  		VS::get_singleton()->camera_set_environment(camera,RID());
  }
  
  Ref<Environment> Camera::get_environment() const {
  
  	return environment;
  }
  
  
  void Camera::set_keep_aspect_mode(KeepAspect p_aspect) {
  
  	keep_aspect=p_aspect;
  	VisualServer::get_singleton()->camera_set_use_vertical_aspect(camera,p_aspect==KEEP_WIDTH);
  
  	_change_notify();
  }
  
  Camera::KeepAspect Camera::get_keep_aspect_mode() const{
  
  	return keep_aspect;
  }
  
  
  
  void Camera::_bind_methods() {
  
  	ObjectTypeDB::bind_method( _MD("project_ray_normal","screen_point"), &Camera::project_ray_normal);
  	ObjectTypeDB::bind_method( _MD("project_local_ray_normal","screen_point"), &Camera::project_local_ray_normal);
  	ObjectTypeDB::bind_method( _MD("project_ray_origin","screen_point"), &Camera::project_ray_origin);
  	ObjectTypeDB::bind_method( _MD("unproject_position","world_point"), &Camera::unproject_position);
  	ObjectTypeDB::bind_method( _MD("project_position","screen_point"), &Camera::project_position);
  	ObjectTypeDB::bind_method( _MD("set_perspective","fov","z_near","z_far"),&Camera::set_perspective );
  	ObjectTypeDB::bind_method( _MD("set_orthogonal","size","z_near","z_far"),&Camera::set_orthogonal );
  	ObjectTypeDB::bind_method( _MD("make_current"),&Camera::make_current );
  	ObjectTypeDB::bind_method( _MD("clear_current"),&Camera::clear_current );
  	ObjectTypeDB::bind_method( _MD("is_current"),&Camera::is_current );
  	ObjectTypeDB::bind_method( _MD("get_camera_transform"),&Camera::get_camera_transform );
  	ObjectTypeDB::bind_method( _MD("get_fov"),&Camera::get_fov );
  	ObjectTypeDB::bind_method( _MD("get_size"),&Camera::get_size );
  	ObjectTypeDB::bind_method( _MD("get_zfar"),&Camera::get_zfar );
  	ObjectTypeDB::bind_method( _MD("get_znear"),&Camera::get_znear );
  	ObjectTypeDB::bind_method( _MD("get_projection"),&Camera::get_projection );
  	ObjectTypeDB::bind_method( _MD("set_visible_layers","mask"),&Camera::set_visible_layers );
  	ObjectTypeDB::bind_method( _MD("get_visible_layers"),&Camera::get_visible_layers );
  	ObjectTypeDB::bind_method( _MD("look_at","target","up"),&Camera::look_at );
  	ObjectTypeDB::bind_method( _MD("look_at_from_pos","pos","target","up"),&Camera::look_at_from_pos );
  	ObjectTypeDB::bind_method(_MD("set_environment","env:Environment"),&Camera::set_environment);
  	ObjectTypeDB::bind_method(_MD("get_environment:Environment"),&Camera::get_environment);
  	ObjectTypeDB::bind_method(_MD("set_keep_aspect_mode","mode"),&Camera::set_keep_aspect_mode);
  	ObjectTypeDB::bind_method(_MD("get_keep_aspect_mode"),&Camera::get_keep_aspect_mode);
  	ObjectTypeDB::bind_method(_MD("_camera_make_next_current"),&Camera::_camera_make_next_current);
  	//ObjectTypeDB::bind_method( _MD("_camera_make_current"),&Camera::_camera_make_current );
  
  	BIND_CONSTANT( PROJECTION_PERSPECTIVE );
  	BIND_CONSTANT( PROJECTION_ORTHOGONAL );
  
  	BIND_CONSTANT( KEEP_WIDTH );
  	BIND_CONSTANT( KEEP_HEIGHT );
  
  }
  
  float Camera::get_fov() const {
  
  	return fov;
  }
  
  float Camera::get_size() const {
  
  	return size;
  }
  
  float Camera::get_znear() const {
  
  	return near;
  }
  
  float Camera::get_zfar() const {
  
  	return far;
  }
  
  
  Camera::Projection Camera::get_projection() const {
  
  	return mode;
  }
  
  void Camera::set_visible_layers(uint32_t p_layers) {
  
  	layers=p_layers;
  	VisualServer::get_singleton()->camera_set_visible_layers(camera,layers);
  }
  
  uint32_t Camera::get_visible_layers() const{
  
  	return layers;
  }
  
  
  Vector<Plane> Camera::get_frustum() const {
  
  	ERR_FAIL_COND_V(!is_inside_world(),Vector<Plane>());
  
  	Size2 viewport_size = viewport_ptr->get_visible_rect().size;
  	CameraMatrix cm;
  	if (mode==PROJECTION_PERSPECTIVE)
  		cm.set_perspective(fov,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  	else
  		cm.set_orthogonal(size,viewport_size.get_aspect(),near,far,keep_aspect==KEEP_WIDTH);
  
  	return cm.get_projection_planes(get_camera_transform());
  
  }
  
  
  
  void Camera::look_at(const Vector3& p_target, const Vector3& p_up_normal) {
  
  	Transform lookat;
  	lookat.origin=get_camera_transform().origin;
  	lookat=lookat.looking_at(p_target,p_up_normal);
  	set_global_transform(lookat);
  }
  
  void Camera::look_at_from_pos(const Vector3& p_pos,const Vector3& p_target, const Vector3& p_up_normal) {
  
  	Transform lookat;
  	lookat.origin=p_pos;
  	lookat=lookat.looking_at(p_target,p_up_normal);
  	set_global_transform(lookat);
  
  }
  
  
  Camera::Camera() {
  
  	camera = VisualServer::get_singleton()->camera_create();
  	size=1;
  	fov=0;
  	near=0;
  	far=0;
  	current=false;
  	viewport_ptr=NULL;
  	force_change=false;
  	mode=PROJECTION_PERSPECTIVE;
  	set_perspective(60.0,0.1,100.0);
  	keep_aspect=KEEP_HEIGHT;
  	layers=0xfffff;
  	VisualServer::get_singleton()->camera_set_visible_layers(camera,layers);
  	//active=false;
  }
  
  
  Camera::~Camera() {
  
  	VisualServer::get_singleton()->free(camera);
  
  }
  
  
  