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/**
* @file lldefs.h
* @brief Various generic constant definitions.
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library 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;
* version 2.1 of the License only.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLDEFS_H
#define LL_LLDEFS_H
#include "stdtypes.h"
#include <cassert>
#include <type_traits>
// Often used array indices
constexpr U32 VX = 0;
constexpr U32 VY = 1;
constexpr U32 VZ = 2;
constexpr U32 VW = 3;
constexpr U32 VS = 3;
constexpr U32 VRED = 0;
constexpr U32 VGREEN = 1;
constexpr U32 VBLUE = 2;
constexpr U32 VALPHA = 3;
constexpr U32 INVALID_DIRECTION = 0xFFFFFFFF;
constexpr U32 EAST = 0;
constexpr U32 NORTH = 1;
constexpr U32 WEST = 2;
constexpr U32 SOUTH = 3;
constexpr U32 NORTHEAST = 4;
constexpr U32 NORTHWEST = 5;
constexpr U32 SOUTHWEST = 6;
constexpr U32 SOUTHEAST = 7;
constexpr U32 MIDDLE = 8;
constexpr U8 EAST_MASK = 0x1<<EAST;
constexpr U8 NORTH_MASK = 0x1<<NORTH;
constexpr U8 WEST_MASK = 0x1<<WEST;
constexpr U8 SOUTH_MASK = 0x1<<SOUTH;
constexpr U8 NORTHEAST_MASK = NORTH_MASK | EAST_MASK;
constexpr U8 NORTHWEST_MASK = NORTH_MASK | WEST_MASK;
constexpr U8 SOUTHWEST_MASK = SOUTH_MASK | WEST_MASK;
constexpr U8 SOUTHEAST_MASK = SOUTH_MASK | EAST_MASK;
constexpr U32 gDirOpposite[8] = {2, 3, 0, 1, 6, 7, 4, 5};
constexpr U32 gDirAdjacent[8][2] = {
{4, 7},
{4, 5},
{5, 6},
{6, 7},
{0, 1},
{1, 2},
{2, 3},
{0, 3}
};
// Magnitude along the x and y axis
constexpr S32 gDirAxes[8][2] = {
{ 1, 0}, // east
{ 0, 1}, // north
{-1, 0}, // west
{ 0,-1}, // south
{ 1, 1}, // ne
{-1, 1}, // nw
{-1,-1}, // sw
{ 1,-1}, // se
};
constexpr S32 gDirMasks[8] = {
EAST_MASK,
NORTH_MASK,
WEST_MASK,
SOUTH_MASK,
NORTHEAST_MASK,
NORTHWEST_MASK,
SOUTHWEST_MASK,
SOUTHEAST_MASK
};
// Sides of a box...
// . Z __.Y
// /|\ /| 0 = NO_SIDE
// | / 1 = FRONT_SIDE = +x
// +------|-----------+ 2 = BACK_SIDE = -x
// /| |/ / /| 3 = LEFT_SIDE = +y
// / | -5- |/ / | 4 = RIGHT_SIDE = -y
// / | /| -3- / | 5 = TOP_SIDE = +z
// +------------------+ | 6 = BOTTOM_SIDE = -z
// | | | / | |
// | |/| | / | |/|
// | 2 | | *-------|-1--------> X
// |/| | -4- |/| |
// | +----|---------|---+
// | / / | /
// | / -6- | /
// |/ / |/
// +------------------+
constexpr U32 NO_SIDE = 0;
constexpr U32 FRONT_SIDE = 1;
constexpr U32 BACK_SIDE = 2;
constexpr U32 LEFT_SIDE = 3;
constexpr U32 RIGHT_SIDE = 4;
constexpr U32 TOP_SIDE = 5;
constexpr U32 BOTTOM_SIDE = 6;
constexpr U8 LL_SOUND_FLAG_NONE = 0x0;
constexpr U8 LL_SOUND_FLAG_LOOP = 1<<0;
constexpr U8 LL_SOUND_FLAG_SYNC_MASTER = 1<<1;
constexpr U8 LL_SOUND_FLAG_SYNC_SLAVE = 1<<2;
constexpr U8 LL_SOUND_FLAG_SYNC_PENDING = 1<<3;
constexpr U8 LL_SOUND_FLAG_QUEUE = 1<<4;
constexpr U8 LL_SOUND_FLAG_STOP = 1<<5;
constexpr U8 LL_SOUND_FLAG_SYNC_MASK = LL_SOUND_FLAG_SYNC_MASTER | LL_SOUND_FLAG_SYNC_SLAVE | LL_SOUND_FLAG_SYNC_PENDING;
//
// *NOTE: These values may be used as hard-coded numbers in scanf() variants.
//
// --------------
// DO NOT CHANGE.
// --------------
//
constexpr U32 LL_MAX_PATH = 1024; // buffer size of maximum path + filename string length
// For strings we send in messages
constexpr U32 STD_STRING_BUF_SIZE = 255; // Buffer size
constexpr U32 STD_STRING_STR_LEN = 254; // Length of the string (not including \0)
// *NOTE: This value is used as hard-coded numbers in scanf() variants.
// DO NOT CHANGE.
constexpr U32 MAX_STRING = STD_STRING_BUF_SIZE; // Buffer size
constexpr U32 MAXADDRSTR = 17; // 123.567.901.345 = 15 chars + \0 + 1 for good luck
// C++ is our friend. . . use template functions to make life easier!
// specific inlines for basic types
//
// defined for all:
// llmin(a,b)
// llmax(a,b)
// llclamp(a,minimum,maximum)
//
// defined for F32, F64:
// llclampf(a) // clamps a to [0.0 .. 1.0]
//
// defined for U16, U32, U64, S16, S32, S64, :
// llclampb(a) // clamps a to [0 .. 255]
//
// llless(d0, d1) safely compares d0 < d1 even if one is signed and the other
// is unsigned. A simple (d0 < d1) expression converts the signed operand to
// unsigned before comparing. If the signed operand is negative, that flips
// the negative value to a huge positive value, producing the wrong answer!
// llless() specifically addresses that case.
template <typename T0, typename T1>
inline bool llless(T0 d0, T1 d1)
{
if constexpr (std::is_signed_v<T0> && ! std::is_signed_v<T1>)
{
// T0 signed, T1 unsigned: negative d0 is less than any unsigned d1
if (d0 < 0)
return true;
// both are non-negative: explicitly cast to avoid C4018
return std::make_unsigned_t<T0>(d0) < d1;
}
else if constexpr (! std::is_signed_v<T0> && std::is_signed_v<T1>)
{
// T0 unsigned, T1 signed: any unsigned d0 is greater than negative d1
if (d1 < 0)
return false;
// both are non-negative: explicitly cast to avoid C4018
return d0 < std::make_unsigned_t<T1>(d1);
}
else
{
// both T0 and T1 are signed, or both are unsigned:
// straightforward comparison works
return d0 < d1;
}
}
// recursion tail
template <typename T>
inline auto llmax(T data)
{
return data;
}
template <typename T0, typename T1, typename... Ts>
inline auto llmax(T0 d0, T1 d1, Ts... rest)
{
auto maxrest = llmax(d1, rest...);
return llless(maxrest, d0)? d0 : maxrest;
}
// recursion tail
template <typename T>
inline auto llmin(T data)
{
return data;
}
template <typename T0, typename T1, typename... Ts>
inline auto llmin(T0 d0, T1 d1, Ts... rest)
{
auto minrest = llmin(d1, rest...);
return llless(d0, minrest) ? d0 : minrest;
}
template <typename A, typename MIN, typename MAX>
inline A llclamp(A a, MIN minval, MAX maxval)
{
// The only troublesome case is if A is unsigned and either minval or
// maxval is both signed and negative. Casting a negative number to
// unsigned flips it to a huge positive number, making this llclamp() call
// ineffective.
if constexpr (! std::is_signed_v<A>)
{
if constexpr (std::is_signed_v<MIN>)
{
assert(minval >= 0);
}
if constexpr (std::is_signed_v<MAX>)
{
assert(maxval >= 0);
}
}
A aminval{ static_cast<A>(minval) }, amaxval{ static_cast<A>(maxval) };
if ( a < aminval )
{
return aminval;
}
else if ( a > amaxval )
{
return amaxval;
}
return a;
}
template <class LLDATATYPE>
inline LLDATATYPE llclampf(LLDATATYPE a)
{
return llmin(llmax(a, LLDATATYPE(0)), LLDATATYPE(1));
}
template <class LLDATATYPE>
inline LLDATATYPE llclampb(LLDATATYPE a)
{
return llmin(llmax(a, LLDATATYPE(0)), LLDATATYPE(255));
}
template <class LLDATATYPE>
inline void llswap(LLDATATYPE& lhs, LLDATATYPE& rhs)
{
std::swap(lhs, rhs);
}
#endif // LL_LLDEFS_H
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