minetest/src/utility.h

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/*
Minetest-c55
Copyright (C) 2010 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 General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU 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.
*/
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/*
(c) 2010 Perttu Ahola <celeron55@gmail.com>
*/
#ifndef UTILITY_HEADER
#define UTILITY_HEADER
#include "common_irrlicht.h"
#include "debug.h"
#include "strfnd.h"
#include "exceptions.h"
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#include <iostream>
#include <fstream>
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#include <string>
#include <sstream>
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#include <jmutex.h>
#include <jmutexautolock.h>
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extern const v3s16 g_26dirs[26];
inline void writeU32(u8 *data, u32 i)
{
data[0] = ((i>>24)&0xff);
data[1] = ((i>>16)&0xff);
data[2] = ((i>> 8)&0xff);
data[3] = ((i>> 0)&0xff);
}
inline void writeU16(u8 *data, u16 i)
{
data[0] = ((i>> 8)&0xff);
data[1] = ((i>> 0)&0xff);
}
inline void writeU8(u8 *data, u8 i)
{
data[0] = ((i>> 0)&0xff);
}
inline u32 readU32(u8 *data)
{
return (data[0]<<24) | (data[1]<<16) | (data[2]<<8) | (data[3]<<0);
}
inline u16 readU16(u8 *data)
{
return (data[0]<<8) | (data[1]<<0);
}
inline u8 readU8(u8 *data)
{
return (data[0]<<0);
}
// Signed variants of the above
inline void writeS32(u8 *data, s32 i){
writeU32(data, (u32)i);
}
inline s32 readS32(u8 *data){
return (s32)readU32(data);
}
inline void writeS16(u8 *data, s16 i){
writeU16(data, (u16)i);
}
inline s16 readS16(u8 *data){
return (s16)readU16(data);
}
inline void writeV3S32(u8 *data, v3s32 p)
{
writeS32(&data[0], p.X);
writeS32(&data[4], p.Y);
writeS32(&data[8], p.Z);
}
inline v3s32 readV3S32(u8 *data)
{
v3s32 p;
p.X = readS32(&data[0]);
p.Y = readS32(&data[4]);
p.Z = readS32(&data[8]);
return p;
}
inline void writeV2S16(u8 *data, v2s16 p)
{
writeS16(&data[0], p.X);
writeS16(&data[2], p.Y);
}
inline v2s16 readV2S16(u8 *data)
{
v2s16 p;
p.X = readS16(&data[0]);
p.Y = readS16(&data[2]);
return p;
}
inline void writeV2S32(u8 *data, v2s32 p)
{
writeS32(&data[0], p.X);
writeS32(&data[2], p.Y);
}
inline v2s32 readV2S32(u8 *data)
{
v2s32 p;
p.X = readS32(&data[0]);
p.Y = readS32(&data[2]);
return p;
}
inline void writeV3S16(u8 *data, v3s16 p)
{
writeS16(&data[0], p.X);
writeS16(&data[2], p.Y);
writeS16(&data[4], p.Z);
}
inline v3s16 readV3S16(u8 *data)
{
v3s16 p;
p.X = readS16(&data[0]);
p.Y = readS16(&data[2]);
p.Z = readS16(&data[4]);
return p;
}
/*
None of these are used at the moment
*/
template <typename T>
class SharedPtr
{
public:
SharedPtr(T *t=NULL)
{
refcount = new int;
*refcount = 1;
ptr = t;
}
SharedPtr(SharedPtr<T> &t)
{
//*this = t;
drop();
refcount = t.refcount;
(*refcount)++;
ptr = t.ptr;
}
~SharedPtr()
{
drop();
}
SharedPtr<T> & operator=(T *t)
{
drop();
refcount = new int;
*refcount = 1;
ptr = t;
return *this;
}
SharedPtr<T> & operator=(SharedPtr<T> &t)
{
drop();
refcount = t.refcount;
(*refcount)++;
ptr = t.ptr;
return *this;
}
T* operator->()
{
return ptr;
}
T & operator*()
{
return *ptr;
}
bool operator!=(T *t)
{
return ptr != t;
}
bool operator==(T *t)
{
return ptr == t;
}
private:
void drop()
{
assert((*refcount) > 0);
(*refcount)--;
if(*refcount == 0)
{
delete refcount;
if(ptr != NULL)
delete ptr;
}
}
T *ptr;
int *refcount;
};
template <typename T>
class Buffer
{
public:
Buffer(unsigned int size)
{
m_size = size;
data = new T[size];
}
Buffer(const Buffer &buffer)
{
m_size = buffer.m_size;
data = new T[buffer.m_size];
memcpy(data, buffer.data, buffer.m_size);
}
Buffer(T *t, unsigned int size)
{
m_size = size;
data = new T[size];
memcpy(data, t, size);
}
~Buffer()
{
delete[] data;
}
T & operator[](unsigned int i) const
{
return data[i];
}
T * operator*() const
{
return data;
}
unsigned int getSize() const
{
return m_size;
}
private:
T *data;
unsigned int m_size;
};
template <typename T>
class SharedBuffer
{
public:
SharedBuffer(unsigned int size)
{
m_size = size;
data = new T[size];
refcount = new unsigned int;
(*refcount) = 1;
}
SharedBuffer(const SharedBuffer &buffer)
{
//std::cout<<"SharedBuffer(const SharedBuffer &buffer)"<<std::endl;
m_size = buffer.m_size;
data = buffer.data;
refcount = buffer.refcount;
(*refcount)++;
}
SharedBuffer & operator=(const SharedBuffer & buffer)
{
//std::cout<<"SharedBuffer & operator=(const SharedBuffer & buffer)"<<std::endl;
if(this == &buffer)
return *this;
drop();
m_size = buffer.m_size;
data = buffer.data;
refcount = buffer.refcount;
(*refcount)++;
return *this;
}
/*
Copies whole buffer
*/
SharedBuffer(T *t, unsigned int size)
{
m_size = size;
data = new T[size];
memcpy(data, t, size);
refcount = new unsigned int;
(*refcount) = 1;
}
/*
Copies whole buffer
*/
SharedBuffer(const Buffer<T> &buffer)
{
m_size = buffer.m_size;
data = new T[buffer.getSize()];
memcpy(data, *buffer, buffer.getSize());
refcount = new unsigned int;
(*refcount) = 1;
}
~SharedBuffer()
{
drop();
}
T & operator[](unsigned int i) const
{
return data[i];
}
T * operator*() const
{
return data;
}
unsigned int getSize() const
{
return m_size;
}
private:
void drop()
{
assert((*refcount) > 0);
(*refcount)--;
if(*refcount == 0)
{
delete[] data;
delete refcount;
}
}
T *data;
unsigned int m_size;
unsigned int *refcount;
};
inline SharedBuffer<u8> SharedBufferFromString(const char *string)
{
SharedBuffer<u8> b((u8*)string, strlen(string)+1);
return b;
}
template<typename T>
class MutexedVariable
{
public:
MutexedVariable(T value):
m_value(value)
{
m_mutex.Init();
}
T get()
{
JMutexAutoLock lock(m_mutex);
return m_value;
}
void set(T value)
{
JMutexAutoLock lock(m_mutex);
m_value = value;
}
// You'll want to grab this in a SharedPtr
JMutexAutoLock * getLock()
{
return new JMutexAutoLock(m_mutex);
}
// You pretty surely want to grab the lock when accessing this
T m_value;
private:
JMutex m_mutex;
};
/*
TimeTaker
*/
class TimeTaker
{
public:
TimeTaker(const char *name, IrrlichtDevice *dev, u32 *result=NULL)
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{
m_name = name;
m_dev = dev;
m_result = result;
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m_running = true;
if(dev == NULL)
{
m_time1 = 0;
return;
}
m_time1 = m_dev->getTimer()->getRealTime();
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}
~TimeTaker()
{
stop();
}
u32 stop(bool quiet=false)
{
if(m_running)
{
if(m_dev == NULL)
{
/*if(quiet == false)
std::cout<<"Couldn't measure time for "<<m_name
<<": dev==NULL"<<std::endl;*/
return 0;
}
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u32 time2 = m_dev->getTimer()->getRealTime();
u32 dtime = time2 - m_time1;
if(m_result != NULL)
{
(*m_result) += dtime;
}
else
{
if(quiet == false)
std::cout<<m_name<<" took "<<dtime<<"ms"<<std::endl;
}
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m_running = false;
return dtime;
}
return 0;
}
private:
const char *m_name;
IrrlichtDevice *m_dev;
u32 m_time1;
bool m_running;
u32 *m_result;
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};
// Calculates the borders of a "d-radius" cube
inline void getFacePositions(core::list<v3s16> &list, u16 d)
{
if(d == 0)
{
list.push_back(v3s16(0,0,0));
return;
}
if(d == 1)
{
/*
This is an optimized sequence of coordinates.
*/
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list.push_back(v3s16( 0, 1, 0)); // top
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list.push_back(v3s16( 0, 0, 1)); // back
list.push_back(v3s16(-1, 0, 0)); // left
list.push_back(v3s16( 1, 0, 0)); // right
list.push_back(v3s16( 0, 0,-1)); // front
list.push_back(v3s16( 0,-1, 0)); // bottom
// 6
list.push_back(v3s16(-1, 0, 1)); // back left
list.push_back(v3s16( 1, 0, 1)); // back right
list.push_back(v3s16(-1, 0,-1)); // front left
list.push_back(v3s16( 1, 0,-1)); // front right
list.push_back(v3s16(-1,-1, 0)); // bottom left
list.push_back(v3s16( 1,-1, 0)); // bottom right
list.push_back(v3s16( 0,-1, 1)); // bottom back
list.push_back(v3s16( 0,-1,-1)); // bottom front
list.push_back(v3s16(-1, 1, 0)); // top left
list.push_back(v3s16( 1, 1, 0)); // top right
list.push_back(v3s16( 0, 1, 1)); // top back
list.push_back(v3s16( 0, 1,-1)); // top front
// 18
list.push_back(v3s16(-1, 1, 1)); // top back-left
list.push_back(v3s16( 1, 1, 1)); // top back-right
list.push_back(v3s16(-1, 1,-1)); // top front-left
list.push_back(v3s16( 1, 1,-1)); // top front-right
list.push_back(v3s16(-1,-1, 1)); // bottom back-left
list.push_back(v3s16( 1,-1, 1)); // bottom back-right
list.push_back(v3s16(-1,-1,-1)); // bottom front-left
list.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++)
{
list.push_back(v3s16(d,y,z));
list.push_back(v3s16(-d,y,z));
if(y != 0)
{
list.push_back(v3s16(d,-y,z));
list.push_back(v3s16(-d,-y,z));
}
}
// Back and front side, excluding borders
for(s16 x=-d+1; x<=d-1; x++)
{
list.push_back(v3s16(x,y,d));
list.push_back(v3s16(x,y,-d));
if(y != 0)
{
list.push_back(v3s16(x,-y,d));
list.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++)
{
list.push_back(v3s16(x,-d,z));
list.push_back(v3s16(x,d,z));
}
}
class IndentationRaiser
{
public:
IndentationRaiser(u16 *indentation)
{
m_indentation = indentation;
(*m_indentation)++;
}
~IndentationRaiser()
{
(*m_indentation)--;
}
private:
u16 *m_indentation;
};
inline s16 getContainerPos(s16 p, s16 d)
{
return (p>=0 ? p : p-d+1) / d;
}
inline v2s16 getContainerPos(v2s16 p, s16 d)
{
return v2s16(
getContainerPos(p.X, d),
getContainerPos(p.Y, d)
);
}
inline v3s16 getContainerPos(v3s16 p, s16 d)
{
return v3s16(
getContainerPos(p.X, d),
getContainerPos(p.Y, d),
getContainerPos(p.Z, d)
);
}
inline bool isInArea(v3s16 p, s16 d)
{
return (
p.X >= 0 && p.X < d &&
p.Y >= 0 && p.Y < d &&
p.Z >= 0 && p.Z < d
);
}
inline bool isInArea(v2s16 p, s16 d)
{
return (
p.X >= 0 && p.X < d &&
p.Y >= 0 && p.Y < d
);
}
inline std::wstring narrow_to_wide(const std::string& mbs)
{
size_t wcl = mbs.size();
SharedBuffer<wchar_t> wcs(wcl+1);
size_t l = mbstowcs(*wcs, mbs.c_str(), wcl);
wcs[l] = 0;
return *wcs;
}
inline std::string wide_to_narrow(const std::wstring& wcs)
{
size_t mbl = wcs.size()*4;
SharedBuffer<char> mbs(mbl+1);
size_t l = wcstombs(*mbs, wcs.c_str(), mbl);
if((int)l == -1)
mbs[0] = 0;
else
mbs[l] = 0;
return *mbs;
}
/*
See test.cpp for example cases.
wraps degrees to the range of -360...360
NOTE: Wrapping to 0...360 is not used because pitch needs negative values.
*/
inline float wrapDegrees(float f)
{
// Take examples of f=10, f=720.5, f=-0.5, f=-360.5
// This results in
// 10, 720, -1, -361
int i = floor(f);
// 0, 2, 0, -1
int l = i / 360;
// NOTE: This would be used for wrapping to 0...360
// 0, 2, -1, -2
/*if(i < 0)
l -= 1;*/
// 0, 720, 0, -360
int k = l * 360;
// 10, 0.5, -0.5, -0.5
f -= float(k);
return f;
}
inline std::string lowercase(std::string s)
{
for(size_t i=0; i<s.size(); i++)
{
if(s[i] >= 'A' && s[i] <= 'Z')
s[i] -= 'A' - 'a';
}
return s;
}
inline bool is_yes(std::string s)
{
s = lowercase(trim(s));
if(s == "y" || s == "yes" || s == "true")
return true;
return false;
}
inline s32 stoi(std::string s, s32 min, s32 max)
{
s32 i = atoi(s.c_str());
if(i < min)
i = min;
if(i > max)
i = max;
return i;
}
inline s32 stoi(std::string s)
{
return atoi(s.c_str());
}
/*
Config stuff
*/
class Settings
{
public:
// Returns false on EOF
bool parseConfigObject(std::istream &is)
{
if(is.eof())
return false;
// NOTE: This function will be expanded to allow multi-line settings
std::string line;
std::getline(is, line);
//dstream<<"got line: \""<<line<<"\""<<std::endl;
std::string trimmedline = trim(line);
// Ignore comments
if(trimmedline[0] == '#')
return true;
//dstream<<"trimmedline=\""<<trimmedline<<"\""<<std::endl;
Strfnd sf(trim(line));
std::string name = sf.next("=");
name = trim(name);
if(name == "")
return true;
std::string value = sf.next("\n");
value = trim(value);
dstream<<"Config name=\""<<name<<"\" value=\""
<<value<<"\""<<std::endl;
m_settings[name] = value;
return true;
}
// Returns true on success
bool readConfigFile(const char *filename)
{
std::ifstream is(filename);
if(is.good() == false)
{
dstream<<"Error opening configuration file: "
<<filename<<std::endl;
return false;
}
dstream<<"Parsing configuration file: "
<<filename<<std::endl;
while(parseConfigObject(is));
return true;
}
void set(std::string name, std::string value)
{
m_settings[name] = value;
}
std::string get(std::string name)
{
core::map<std::string, std::string>::Node *n;
n = m_settings.find(name);
if(n == NULL)
throw SettingNotFoundException("Setting not found");
return n->getValue();
}
bool getBool(std::string name)
{
return is_yes(get(name));
}
// Asks if empty
bool getBoolAsk(std::string name, std::string question, bool def)
{
std::string s = get(name);
if(s != "")
return is_yes(s);
char templine[10];
std::cout<<question<<" [y/N]: ";
std::cin.getline(templine, 10);
s = templine;
if(s == "")
return def;
return is_yes(s);
}
float getFloat(std::string name)
{
float f;
std::istringstream vis(get(name));
vis>>f;
return f;
}
u16 getU16(std::string name)
{
return stoi(get(name), 0, 65535);
}
u16 getU16Ask(std::string name, std::string question, u16 def)
{
std::string s = get(name);
if(s != "")
return stoi(s, 0, 65535);
char templine[10];
std::cout<<question<<" ["<<def<<"]: ";
std::cin.getline(templine, 10);
s = templine;
if(s == "")
return def;
return stoi(s, 0, 65535);
}
s16 getS16(std::string name)
{
return stoi(get(name), -32768, 32767);
}
s32 getS32(std::string name)
{
return stoi(get(name));
}
private:
core::map<std::string, std::string> m_settings;
};
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/*
A thread-safe texture cache.
This is used so that irrlicht doesn't get called from many threads
*/
class TextureCache
{
public:
TextureCache()
{
m_mutex.Init();
assert(m_mutex.IsInitialized());
}
void set(std::string name, video::ITexture *texture)
{
JMutexAutoLock lock(m_mutex);
m_textures[name] = texture;
}
video::ITexture* get(std::string name)
{
JMutexAutoLock lock(m_mutex);
core::map<std::string, video::ITexture*>::Node *n;
n = m_textures.find(name);
if(n != NULL)
return n->getValue();
return NULL;
}
private:
core::map<std::string, video::ITexture*> m_textures;
JMutex m_mutex;
};
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#endif