src/client/localplayer.cpp


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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "localplayer.h"
#include <cmath>
#include "mtevent.h"
#include "collision.h"
#include "nodedef.h"
#include "settings.h"
#include "environment.h"
#include "map.h"
#include "client.h"
#include "content_cao.h"

/*
	LocalPlayer
*/

LocalPlayer::LocalPlayer(Client *client, const char *name):
	Player(name, client->idef()),
	m_client(client)
{
}

static aabb3f getNodeBoundingBox(const std::vector<aabb3f> &nodeboxes)
{
	if (nodeboxes.empty())
		return aabb3f(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);

	aabb3f b_max;

	std::vector<aabb3f>::const_iterator it = nodeboxes.begin();
	b_max = aabb3f(it->MinEdge, it->MaxEdge);

	++it;
	for (; it != nodeboxes.end(); ++it)
		b_max.addInternalBox(*it);

	return b_max;
}

bool LocalPlayer::updateSneakNode(Map *map, const v3f &position,
	const v3f &sneak_max)
{
	static const v3s16 dir9_center[9] = {
		v3s16( 0, 0,  0),
		v3s16( 1, 0,  0),
		v3s16(-1, 0,  0),
		v3s16( 0, 0,  1),
		v3s16( 0, 0, -1),
		v3s16( 1, 0,  1),
		v3s16(-1, 0,  1),
		v3s16( 1, 0, -1),
		v3s16(-1, 0, -1)
	};

	const NodeDefManager *nodemgr = m_client->ndef();
	MapNode node;
	bool is_valid_position;
	bool new_sneak_node_exists = m_sneak_node_exists;

	// We want the top of the sneak node to be below the players feet
	f32 position_y_mod = 0.05f * BS;
	if (m_sneak_node_exists)
		position_y_mod = m_sneak_node_bb_top.MaxEdge.Y - position_y_mod;

	// Get position of current standing node
	const v3s16 current_node = floatToInt(position - v3f(0.0f, position_y_mod, 0.0f), BS);

	if (current_node != m_sneak_node) {
		new_sneak_node_exists = false;
	} else {
		node = map->getNode(current_node, &is_valid_position);
		if (!is_valid_position || !nodemgr->get(node).walkable)
			new_sneak_node_exists = false;
	}

	// Keep old sneak node
	if (new_sneak_node_exists)
		return true;

	// Get new sneak node
	m_sneak_ladder_detected = false;
	f32 min_distance_f = 100000.0f * BS;

	for (const auto &d : dir9_center) {
		const v3s16 p = current_node + d;
		const v3f pf = intToFloat(p, BS);
		const v2f diff(position.X - pf.X, position.Z - pf.Z);
		f32 distance_f = diff.getLength();

		if (distance_f > min_distance_f ||
				fabs(diff.X) > (0.5f + 0.1f) * BS + sneak_max.X ||
				fabs(diff.Y) > (0.5f + 0.1f) * BS + sneak_max.Z)
			continue;


		// The node to be sneaked on has to be walkable
		node = map->getNode(p, &is_valid_position);
		if (!is_valid_position || !nodemgr->get(node).walkable)
			continue;
		// And the node(s) above have to be nonwalkable
		bool ok = true;
		if (!physics_override_sneak_glitch) {
			u16 height =
				ceilf((m_collisionbox.MaxEdge.Y - m_collisionbox.MinEdge.Y) / BS);
			for (u16 y = 1; y <= height; y++) {
				node = map->getNode(p + v3s16(0, y, 0), &is_valid_position);
				if (!is_valid_position || nodemgr->get(node).walkable) {
					ok = false;
					break;
				}
			}
		} else {
			// legacy behaviour: check just one node
			node = map->getNode(p + v3s16(0, 1, 0), &is_valid_position);
			ok = is_valid_position && !nodemgr->get(node).walkable;
		}
		if (!ok)
			continue;

		min_distance_f = distance_f;
		m_sneak_node = p;
		new_sneak_node_exists = true;
	}

	if (!new_sneak_node_exists)
		return false;

	// Update saved top bounding box of sneak node
	node = map->getNode(m_sneak_node);
	std::vector<aabb3f> nodeboxes;
	node.getCollisionBoxes(nodemgr, &nodeboxes);
	m_sneak_node_bb_top = getNodeBoundingBox(nodeboxes);

	if (physics_override_sneak_glitch) {
		// Detect sneak ladder:
		// Node two meters above sneak node must be solid
		node = map->getNode(m_sneak_node + v3s16(0, 2, 0),
			&is_valid_position);
		if (is_valid_position && nodemgr->get(node).walkable) {
			// Node three meters above: must be non-solid
			node = map->getNode(m_sneak_node + v3s16(0, 3, 0),
				&is_valid_position);
			m_sneak_ladder_detected = is_valid_position &&