godot/scene/3d/camera.cpp

/*************************************************************************/
/*  camera.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#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 == "h_offset")
		h_offset = p_value;
	else if (p_name == "v_offset")
		v_offset = p_value;
	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_node_being_edited(this)) {
			r_ret = current;
		} else {
			r_ret = is_current();
		}
	} else if (p_name == "visible_layers") {
		r_ret = get_visible_layers();
	} else if (p_name == "h_offset") {
		r_ret = get_h_offset();
	} else if (p_name == "v_offset") {
		r_ret = get_v_offset();
	} 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, "1,179,0.1", PROPERTY_USAGE_NOEDITOR));
			if (keep_aspect == KEEP_WIDTH)
				p_list->push_back(PropertyInfo(Variant::REAL, "fovx", PROPERTY_HINT_RANGE, "1,179,0.1", PROPERTY_USAGE_EDITOR));
			else
				p_list->push_back(PropertyInfo(Variant::REAL, "fovy", PROPERTY_HINT_RANGE, "1,179,0.1", 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"));
	p_list->push_back(PropertyInfo(Variant::REAL, "h_offset"));
	p_list->push_back(PropertyInfo(Variant::REAL, "v_offset"));
}

void Camera::_update_camera() {

	Transform tr = get_camera_transform();
	tr.origin += tr.basis.get_axis(1) * v_offset;
	tr.origin += tr.basis.get_axis(0) * h_offset;
	VisualServer::get_singleton()->camera_set_transform(camera, tr);

	// here goes listener stuff
	//	if (viewport_ptr && is_inside_scene() && is_current())
	//		get_viewport()->_camera_transform_changed_notify();

	if (is_inside_tree() && is_current()) {
		get_viewport()->_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: {

			bool first_camera = get_viewport()->_camera_add(this);
			if (!get_tree()->is_node_being_edited(this) && (current || first_camera))
				make_current();

		} break;
		case NOTIFICATION_TRANSFORM_CHANGED: {

			_request_camera_update();
		} break;
		case NOTIFICATION_EXIT_WORLD: {

			if (!get_tree()->is_node_being_edited(this)) {
				if (is_current()) {
					clear_current();
					current = true; //keep it true

				} else {
					current = false;
				}
			}

			get_viewport()->_camera_remove(this);

		} 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;

	get_viewport()->_camera_set(this);

	//get_scene()->call_group(SceneMainLoop::GROUP_CALL_REALTIME,camera_group,"_camera_make_current",this);
}

void Camera::clear_current() {

	current = false;
	if (!is_inside_tree())
		return;

	if (get_viewport()->get_camera() == this) {
		get_viewport()->_camera_set(NULL);
		get_viewport()->_camera_make_next_current(this);
	}
}

bool Camera::is_current() const {

	if (is_inside_tree() && !get_tree()->is_node_being_edited(this)) {

		return get_viewport()->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 = get_viewport()->get_visible_rect().size;
	Vector2 cpos = p_pos;
#else

	Size2 viewport_size = get_viewport()->get_camera_rect_size();
	Vector2 cpos = get_viewport()->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 = get_viewport()->get_visible_rect().size;
	Vector2 cpos = p_pos;
#else

	Size2 viewport_size = get_viewport()->get_camera_rect_size();
	Vector2 cpos = get_viewport()->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;
	};
};

bool Camera::is_position_behind(const Vector3 &p_pos) const {

	Transform t = get_global_transform();
	Vector3 eyedir = -get_global_transform().basis.get_axis(2).normalized();
	return eyedir.dot(p_pos) < (eyedir.dot(t.origin) + near);
}

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 = get_viewport()->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 = get_viewport()->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 = (1.0 - (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("is_position_behind", "world_point"), &Camera::is_position_behind);
	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_h_offset", "ofs"), &Camera::set_h_offset);
	ObjectTypeDB::bind_method(_MD("get_h_offset"), &Camera::get_h_offset);
	ObjectTypeDB::bind_method(_MD("set_v_offset", "ofs"), &Camera::set_v_offset);
	ObjectTypeDB::bind_method(_MD("get_v_offset"), &Camera::get_v_offset);
	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("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_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 = get_viewport()->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::set_v_offset(float p_offset) {

	v_offset = p_offset;
	_update_camera();
}

float Camera::get_v_offset() const {

	return v_offset;
}

void Camera::set_h_offset(float p_offset) {
	h_offset = p_offset;
	_update_camera();
}

float Camera::get_h_offset() const {

	return h_offset;
}

Camera::Camera() {

	camera = VisualServer::get_singleton()->camera_create();
	size = 1;
	fov = 0;
	near = 0;
	far = 0;
	current = false;
	force_change = false;
	mode = PROJECTION_PERSPECTIVE;
	set_perspective(65.0, 0.1, 100.0);
	keep_aspect = KEEP_HEIGHT;
	layers = 0xfffff;
	v_offset = 0;
	h_offset = 0;
	VisualServer::get_singleton()->camera_set_visible_layers(camera, layers);
	//active=false;
}

Camera::~Camera() {

	VisualServer::get_singleton()->free(camera);
}