src/script/cpp_api/s_player.h


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/*
Minetest
Copyright (C) 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.
*/

#ifndef S_PLAYER_H_
#define S_PLAYER_H_

#include "cpp_api/s_base.h"
#include "irr_v3d.h"
#include "util/string.h"

struct ToolCapabilities;

class ScriptApiPlayer
		: virtual public ScriptApiBase
{
public:
	virtual ~ScriptApiPlayer();

	void on_newplayer(ServerActiveObject *player);
	void on_dieplayer(ServerActiveObject *player);
	bool on_respawnplayer(ServerActiveObject *player);
	bool on_prejoinplayer(const std::string &name, const std::string &ip,
		std::string *reason);
	void on_joinplayer(ServerActiveObject *player);
	void on_leaveplayer(ServerActiveObject *player);
	void on_cheat(ServerActiveObject *player, const std::string &cheat_type);
	bool on_punchplayer(ServerActiveObject *player,
		ServerActiveObject *hitter, float time_from_last_punch,
		const ToolCapabilities *toolcap, v3f dir, s16 damage);
	s16 on_player_hpchange(ServerActiveObject *player, s16 hp_change);
	void on_playerReceiveFields(ServerActiveObject *player,
		const std::string &formname, const StringMap &fields);
};


#endif /* S_PLAYER_H_ */
/*
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 "numeric.h"
#include "mathconstants.h"

#include "log.h"
#include "../constants.h" // BS, MAP_BLOCKSIZE
#include "../noise.h" // PseudoRandom, PcgRandom
#include "../threading/mutex_auto_lock.h"
#include <string.h>
#include <iostream>

UNORDERED_MAP<u16, std::vector<v3s16> > FacePositionCache::m_cache;
Mutex FacePositionCache::m_cache_mutex;
// Calculate the borders of a "d-radius" cube
// TODO: Make it work without mutex and data races, probably thread-local
std::vector<v3s16> FacePositionCache::getFacePositions(u16 d)
{
	MutexAutoLock cachelock(m_cache_mutex);
	if (m_cache.find(d) != m_cache.end())
		return m_cache[d];

	generateFacePosition(d);
	return m_cache[d];

}

void FacePositionCache::generateFacePosition(u16 d)
{
	m_cache[d] = std::vector<v3s16>();
	if(d == 0) {
		m_cache[d].push_back(v3s16(0,0,0));
		return;
	}
	if(d == 1) {
		/*
			This is an optimized sequence of coordinates.
		*/
		m_cache[d].push_back(v3s16( 0, 1, 0)); // top
		m_cache[d].push_back(v3s16( 0, 0, 1)); // back
		m_cache[d].push_back(v3s16(-1, 0, 0)); // left
		m_cache[d].push_back(v3s16( 1, 0, 0)); // right
		m_cache[d].push_back(v3s16( 0, 0,-1)); // front
		m_cache[d].push_back(v3s16( 0,-1, 0)); // bottom
		// 6
		m_cache[d].push_back(v3s16(-1, 0, 1)); // back left
		m_cache[d].push_back(v3s16( 1, 0, 1)); // back right
		m_cache[d].push_back(v3s16(-1, 0,-1)); // front left
		m_cache[d].push_back(v3s16( 1, 0,-1)); // front right
		m_cache[d].push_back(v3s16(-1,-1, 0)); // bottom left
		m_cache[d].push_back(v3s16( 1,-1, 0)); // bottom right
		m_cache[d].push_back(v3s16( 0,-1, 1)); // bottom back
		m_cache[d].push_back(v3s16( 0,-1,-1)); // bottom front
		m_cache[d].push_back(v3s16(-1, 1, 0)); // top left
		m_cache[d].push_back(v3s16( 1, 1, 0)); // top right
		m_cache[d].push_back(v3s16( 0, 1, 1)); // top back
		m_cache[d].push_back(v3s16( 0, 1,-1)); // top front
		// 18
		m_cache[d].push_back(v3s16(-1, 1, 1)); // top back-left
		m_cache[d].push_back(v3s16( 1, 1, 1)); // top back-right
		m_cache[d].push_back(v3s16(-1, 1,-1)); // top front-left
		m_cache[d].push_back(v3s16( 1, 1,-1)); // top front-right
		m_cache[d].push_back(v3s16(-1,-1, 1)); // bottom back-left
		m_cache[d].push_back(v3s16( 1,-1, 1)); // bottom back-right
		m_cache[d].push_back(v3s16(-1,-1,-1)); // bottom front-left
		m_cache[d].push_back(v3s16( 1,-1,-1)); // bottom front-right
		// 26
		return;
	}

	// Take blocks in all sides, starting from y=0 and going +-y
	for(s16 y=0; y<=d-1; y++) {
		// Left and right side, including borders
		for(s16 z=-d; z<=d; z++) {
			m_cache[d].push_back(v3s16(d,y,z));
			m_cache[d].push_back(v3s16(-d,y,z));
			if(y != 0) {
				m_cache[d].push_back(v3s16(d,-y,z));
				m_cache[d].push_back(v3s16(-d,-y,z));
			}
		}
		// Back and front side, excluding borders
		for(s16 x=-d+1; x<=d-1; x++) {
			m_cache[d].push_back(v3s16(x,y,d));
			m_cache[d].push_back(v3s16(x,y,-d));
			if(y != 0) {
				m_cache[d].push_back(v3s16(x,-y,d));
				m_cache[d].push_back(v3s16(x,-y,-d));
			}
		}
	}

	// Take the bottom and top face with borders
	// -d<x<d, y=+-d, -d<z<d
	for(s16 x=-d; x<=d; x++)
	for(s16 z=-d; z<=d; z++) {
		m_cache[d].push_back(v3s16(x,-d,z));
		m_cache[d].push_back(v3s16(x,d,z));
	}
}

/*
    myrand
*/

PcgRandom g_pcgrand;

u32 myrand()
{
	return g_pcgrand.next();
}

void mysrand(unsigned int seed)
{
	g_pcgrand.seed(seed);
}

void myrand_bytes(void *out, size_t len)
{
	g_pcgrand.bytes(out, len);
}

int myrand_range(int min, int max)
{
	return g_pcgrand.range(min, max);
}


/*
	64-bit unaligned version of MurmurHash
*/
u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed)
{
	const u64 m = 0xc6a4a7935bd1e995ULL;
	const int r = 47;
	u64 h = seed ^ (len * m);

	const u64 *data = (const u64 *)key;
	const u64 *end = data + (len / 8);

	while (data != end) {
		u64 k;
		memcpy(&k, data, sizeof(u64));
		data++;

		k *= m;
		k ^= k >> r;
		k *= m;

		h ^= k;
		h *= m;
	}

	const unsigned char *data2 = (const unsigned char *)data;
	switch (len & 7) {
		case 7: h ^= (u64)data2[6] << 48;
		case 6: h ^= (u64)data2[5] << 40;
		case 5: h ^= (u64)data2[4] << 32;
		case 4: h ^= (u64)data2[3] << 24;
		case 3: h ^= (u64)data2[2] << 16;
		case 2: h ^= (u64)data2[1] << 8;
		case 1: h ^= (u64)data2[0];
				h *= m;
	}

	h ^= h >> r;
	h *= m;
	h ^= h >> r;

	return h;
}

/*
	blockpos_b: position of block in block coordinates
	camera_pos: position of camera in nodes
	camera_dir: an unit vector pointing to camera direction
	range: viewing range
	distance_ptr: return location for distance from the camera
*/
bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
		f32 camera_fov, f32 range, f32 *distance_ptr)
{
	// Maximum radius of a block.  The magic number is
	// sqrt(3.0) / 2.0 in literal form.
	const f32 block_max_radius = 0.866025403784 * MAP_BLOCKSIZE * BS;

	v3s16 blockpos_nodes = blockpos_b * MAP_BLOCKSIZE;

	// Block center position
	v3f blockpos(