1128 lines
34 KiB
C++
1128 lines
34 KiB
C++
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#include "Globals.h" // NOTE: MSVC stupidness requires this to be the same across all modules
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#include "Noise.h"
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#define FAST_FLOOR(x) (((x) < 0) ? (((int)x) - 1) : ((int)x))
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////////////////////////////////////////////////////////////////////////////////
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// Globals:
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void Debug3DNoise(const NOISE_DATATYPE * a_Noise, int a_SizeX, int a_SizeY, int a_SizeZ, const AString & a_FileNameBase)
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{
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const int BUF_SIZE = 512;
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ASSERT(a_SizeX <= BUF_SIZE); // Just stretch it, if needed
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// Save in XY cuts:
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cFile f1;
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if (f1.Open(Printf("%s_XY (%d).grab", a_FileNameBase.c_str(), a_SizeX), cFile::fmWrite))
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{
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for (int z = 0; z < a_SizeZ; z++)
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{
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for (int y = 0; y < a_SizeY; y++)
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{
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int idx = y * a_SizeX + z * a_SizeX * a_SizeY;
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unsigned char buf[BUF_SIZE];
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for (int x = 0; x < a_SizeX; x++)
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{
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buf[x] = (unsigned char)(std::min(255, std::max(0, (int)(128 + 32 * a_Noise[idx++]))));
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}
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f1.Write(buf, a_SizeX);
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} // for y
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unsigned char buf[BUF_SIZE];
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memset(buf, 0, a_SizeX);
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f1.Write(buf, a_SizeX);
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} // for z
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} // if (XY file open)
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cFile f2;
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if (f2.Open(Printf("%s_XZ (%d).grab", a_FileNameBase.c_str(), a_SizeX), cFile::fmWrite))
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{
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for (int y = 0; y < a_SizeY; y++)
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{
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for (int z = 0; z < a_SizeZ; z++)
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{
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int idx = y * a_SizeX + z * a_SizeX * a_SizeY;
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unsigned char buf[BUF_SIZE];
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for (int x = 0; x < a_SizeX; x++)
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{
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buf[x] = (unsigned char)(std::min(255, std::max(0, (int)(128 + 32 * a_Noise[idx++]))));
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}
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f2.Write(buf, a_SizeX);
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} // for z
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unsigned char buf[BUF_SIZE];
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memset(buf, 0, a_SizeX);
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f2.Write(buf, a_SizeX);
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} // for y
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} // if (XZ file open)
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}
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void Debug2DNoise(const NOISE_DATATYPE * a_Noise, int a_SizeX, int a_SizeY, const AString & a_FileNameBase)
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{
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const int BUF_SIZE = 512;
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ASSERT(a_SizeX <= BUF_SIZE); // Just stretch it, if needed
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cFile f1;
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if (f1.Open(Printf("%s (%d).grab", a_FileNameBase.c_str(), a_SizeX), cFile::fmWrite))
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{
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for (int y = 0; y < a_SizeY; y++)
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{
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int idx = y * a_SizeX;
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unsigned char buf[BUF_SIZE];
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for (int x = 0; x < a_SizeX; x++)
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{
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buf[x] = (unsigned char)(std::min(255, std::max(0, (int)(128 + 32 * a_Noise[idx++]))));
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}
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f1.Write(buf, a_SizeX);
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} // for y
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} // if (file open)
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}
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////////////////////////////////////////////////////////////////////////////////
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// cCubicCell2D:
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class cCubicCell2D
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{
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public:
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cCubicCell2D(
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const cNoise & a_Noise, ///< Noise to use for generating the random values
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NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
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int a_SizeX, int a_SizeY, ///< Count of the array, in each direction
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const NOISE_DATATYPE * a_FracX, ///< Pointer to the array that stores the X fractional values
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const NOISE_DATATYPE * a_FracY ///< Pointer to the attay that stores the Y fractional values
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);
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/// Uses current m_WorkRnds[] to generate part of the array
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void Generate(
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int a_FromX, int a_ToX,
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int a_FromY, int a_ToY
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);
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/// Initializes m_WorkRnds[] with the specified Floor values
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void InitWorkRnds(int a_FloorX, int a_FloorY);
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/// Updates m_WorkRnds[] for the new Floor values.
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void Move(int a_NewFloorX, int a_NewFloorY);
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protected:
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typedef NOISE_DATATYPE Workspace[4][4];
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const cNoise & m_Noise;
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Workspace * m_WorkRnds; ///< The current random values; points to either m_Workspace1 or m_Workspace2 (doublebuffering)
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Workspace m_Workspace1; ///< Buffer 1 for workspace doublebuffering, used in Move()
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Workspace m_Workspace2; ///< Buffer 2 for workspace doublebuffering, used in Move()
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int m_CurFloorX;
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int m_CurFloorY;
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NOISE_DATATYPE * m_Array;
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int m_SizeX, m_SizeY;
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const NOISE_DATATYPE * m_FracX;
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const NOISE_DATATYPE * m_FracY;
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} ;
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cCubicCell2D::cCubicCell2D(
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const cNoise & a_Noise, ///< Noise to use for generating the random values
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NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
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int a_SizeX, int a_SizeY, ///< Count of the array, in each direction
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const NOISE_DATATYPE * a_FracX, ///< Pointer to the array that stores the X fractional values
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const NOISE_DATATYPE * a_FracY ///< Pointer to the attay that stores the Y fractional values
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) :
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m_Noise(a_Noise),
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m_WorkRnds(&m_Workspace1),
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m_Array(a_Array),
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m_SizeX(a_SizeX),
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m_SizeY(a_SizeY),
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m_FracX(a_FracX),
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m_FracY(a_FracY)
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{
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}
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void cCubicCell2D::Generate(
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int a_FromX, int a_ToX,
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int a_FromY, int a_ToY
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)
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{
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for (int y = a_FromY; y < a_ToY; y++)
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{
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NOISE_DATATYPE Interp[4];
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NOISE_DATATYPE FracY = m_FracY[y];
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Interp[0] = cNoise::CubicInterpolate((*m_WorkRnds)[0][0], (*m_WorkRnds)[0][1], (*m_WorkRnds)[0][2], (*m_WorkRnds)[0][3], FracY);
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Interp[1] = cNoise::CubicInterpolate((*m_WorkRnds)[1][0], (*m_WorkRnds)[1][1], (*m_WorkRnds)[1][2], (*m_WorkRnds)[1][3], FracY);
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Interp[2] = cNoise::CubicInterpolate((*m_WorkRnds)[2][0], (*m_WorkRnds)[2][1], (*m_WorkRnds)[2][2], (*m_WorkRnds)[2][3], FracY);
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Interp[3] = cNoise::CubicInterpolate((*m_WorkRnds)[3][0], (*m_WorkRnds)[3][1], (*m_WorkRnds)[3][2], (*m_WorkRnds)[3][3], FracY);
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int idx = y * m_SizeX + a_FromX;
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for (int x = a_FromX; x < a_ToX; x++)
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{
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m_Array[idx++] = cNoise::CubicInterpolate(Interp[0], Interp[1], Interp[2], Interp[3], m_FracX[x]);
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} // for x
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} // for y
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}
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void cCubicCell2D::InitWorkRnds(int a_FloorX, int a_FloorY)
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{
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m_CurFloorX = a_FloorX;
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m_CurFloorY = a_FloorY;
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for (int x = 0; x < 4; x++)
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{
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int cx = a_FloorX + x - 1;
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for (int y = 0; y < 4; y++)
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{
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int cy = a_FloorY + y - 1;
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(*m_WorkRnds)[x][y] = (NOISE_DATATYPE)m_Noise.IntNoise2D(cx, cy);
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}
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}
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}
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void cCubicCell2D::Move(int a_NewFloorX, int a_NewFloorY)
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{
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// Swap the doublebuffer:
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int OldFloorX = m_CurFloorX;
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int OldFloorY = m_CurFloorY;
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Workspace * OldWorkRnds = m_WorkRnds;
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m_WorkRnds = (m_WorkRnds == &m_Workspace1) ? &m_Workspace2 : &m_Workspace1;
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// Reuse as much of the old workspace as possible:
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int DiffX = OldFloorX - a_NewFloorX;
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int DiffY = OldFloorY - a_NewFloorY;
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for (int x = 0; x < 4; x++)
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{
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int cx = a_NewFloorX + x - 1;
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int OldX = x - DiffX; // Where would this X be in the old grid?
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for (int y = 0; y < 4; y++)
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{
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int cy = a_NewFloorY + y - 1;
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int OldY = y - DiffY; // Where would this Y be in the old grid?
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if ((OldX >= 0) && (OldX < 4) && (OldY >= 0) && (OldY < 4))
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{
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(*m_WorkRnds)[x][y] = (*OldWorkRnds)[OldX][OldY];
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}
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else
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{
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(*m_WorkRnds)[x][y] = (NOISE_DATATYPE)m_Noise.IntNoise2D(cx, cy);
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}
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}
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}
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m_CurFloorX = a_NewFloorX;
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m_CurFloorY = a_NewFloorY;
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}
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////////////////////////////////////////////////////////////////////////////////
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// cCubicCell3D:
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class cCubicCell3D
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{
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public:
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cCubicCell3D(
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const cNoise & a_Noise, ///< Noise to use for generating the random values
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NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
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int a_SizeX, int a_SizeY, int a_SizeZ, ///< Count of the array, in each direction
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const NOISE_DATATYPE * a_FracX, ///< Pointer to the array that stores the X fractional values
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const NOISE_DATATYPE * a_FracY, ///< Pointer to the attay that stores the Y fractional values
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const NOISE_DATATYPE * a_FracZ ///< Pointer to the array that stores the Z fractional values
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);
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/// Uses current m_WorkRnds[] to generate part of the array
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void Generate(
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int a_FromX, int a_ToX,
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int a_FromY, int a_ToY,
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int a_FromZ, int a_ToZ
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);
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/// Initializes m_WorkRnds[] with the specified Floor values
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void InitWorkRnds(int a_FloorX, int a_FloorY, int a_FloorZ);
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/// Updates m_WorkRnds[] for the new Floor values.
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void Move(int a_NewFloorX, int a_NewFloorY, int a_NewFloorZ);
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protected:
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typedef NOISE_DATATYPE Workspace[4][4][4];
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const cNoise & m_Noise;
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Workspace * m_WorkRnds; ///< The current random values; points to either m_Workspace1 or m_Workspace2 (doublebuffering)
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Workspace m_Workspace1; ///< Buffer 1 for workspace doublebuffering, used in Move()
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Workspace m_Workspace2; ///< Buffer 2 for workspace doublebuffering, used in Move()
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int m_CurFloorX;
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int m_CurFloorY;
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int m_CurFloorZ;
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NOISE_DATATYPE * m_Array;
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int m_SizeX, m_SizeY, m_SizeZ;
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const NOISE_DATATYPE * m_FracX;
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const NOISE_DATATYPE * m_FracY;
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const NOISE_DATATYPE * m_FracZ;
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} ;
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cCubicCell3D::cCubicCell3D(
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const cNoise & a_Noise, ///< Noise to use for generating the random values
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NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
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int a_SizeX, int a_SizeY, int a_SizeZ, ///< Count of the array, in each direction
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const NOISE_DATATYPE * a_FracX, ///< Pointer to the array that stores the X fractional values
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const NOISE_DATATYPE * a_FracY, ///< Pointer to the attay that stores the Y fractional values
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const NOISE_DATATYPE * a_FracZ ///< Pointer to the array that stores the Z fractional values
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) :
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m_Noise(a_Noise),
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m_WorkRnds(&m_Workspace1),
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m_Array(a_Array),
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m_SizeX(a_SizeX),
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m_SizeY(a_SizeY),
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m_SizeZ(a_SizeZ),
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m_FracX(a_FracX),
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m_FracY(a_FracY),
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m_FracZ(a_FracZ)
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{
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}
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void cCubicCell3D::Generate(
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int a_FromX, int a_ToX,
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int a_FromY, int a_ToY,
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int a_FromZ, int a_ToZ
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)
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{
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for (int z = a_FromZ; z < a_ToZ; z++)
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{
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int idxZ = z * m_SizeX * m_SizeY;
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NOISE_DATATYPE Interp2[4][4];
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NOISE_DATATYPE FracZ = m_FracZ[z];
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for (int x = 0; x < 4; x++)
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{
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for (int y = 0; y < 4; y++)
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{
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Interp2[x][y] = cNoise::CubicInterpolate((*m_WorkRnds)[x][y][0], (*m_WorkRnds)[x][y][1], (*m_WorkRnds)[x][y][2], (*m_WorkRnds)[x][y][3], FracZ);
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}
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}
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for (int y = a_FromY; y < a_ToY; y++)
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{
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NOISE_DATATYPE Interp[4];
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NOISE_DATATYPE FracY = m_FracY[y];
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Interp[0] = cNoise::CubicInterpolate(Interp2[0][0], Interp2[0][1], Interp2[0][2], Interp2[0][3], FracY);
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Interp[1] = cNoise::CubicInterpolate(Interp2[1][0], Interp2[1][1], Interp2[1][2], Interp2[1][3], FracY);
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Interp[2] = cNoise::CubicInterpolate(Interp2[2][0], Interp2[2][1], Interp2[2][2], Interp2[2][3], FracY);
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Interp[3] = cNoise::CubicInterpolate(Interp2[3][0], Interp2[3][1], Interp2[3][2], Interp2[3][3], FracY);
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int idx = idxZ + y * m_SizeX + a_FromX;
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for (int x = a_FromX; x < a_ToX; x++)
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{
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m_Array[idx++] = cNoise::CubicInterpolate(Interp[0], Interp[1], Interp[2], Interp[3], m_FracX[x]);
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} // for x
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} // for y
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} // for z
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}
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void cCubicCell3D::InitWorkRnds(int a_FloorX, int a_FloorY, int a_FloorZ)
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{
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m_CurFloorX = a_FloorX;
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m_CurFloorY = a_FloorY;
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m_CurFloorZ = a_FloorZ;
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for (int x = 0; x < 4; x++)
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{
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int cx = a_FloorX + x - 1;
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for (int y = 0; y < 4; y++)
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{
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int cy = a_FloorY + y - 1;
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for (int z = 0; z < 4; z++)
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{
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int cz = a_FloorZ + z - 1;
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(*m_WorkRnds)[x][y][z] = (NOISE_DATATYPE)m_Noise.IntNoise3D(cx, cy, cz);
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}
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}
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}
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}
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void cCubicCell3D::Move(int a_NewFloorX, int a_NewFloorY, int a_NewFloorZ)
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{
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// Swap the doublebuffer:
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int OldFloorX = m_CurFloorX;
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int OldFloorY = m_CurFloorY;
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int OldFloorZ = m_CurFloorZ;
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Workspace * OldWorkRnds = m_WorkRnds;
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m_WorkRnds = (m_WorkRnds == &m_Workspace1) ? &m_Workspace2 : &m_Workspace1;
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// Reuse as much of the old workspace as possible:
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int DiffX = OldFloorX - a_NewFloorX;
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int DiffY = OldFloorY - a_NewFloorY;
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int DiffZ = OldFloorZ - a_NewFloorZ;
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for (int x = 0; x < 4; x++)
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{
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int cx = a_NewFloorX + x - 1;
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int OldX = x - DiffX; // Where would this X be in the old grid?
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for (int y = 0; y < 4; y++)
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{
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int cy = a_NewFloorY + y - 1;
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int OldY = y - DiffY; // Where would this Y be in the old grid?
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for (int z = 0; z < 4; z++)
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{
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int cz = a_NewFloorZ + z - 1;
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int OldZ = z - DiffZ;
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if ((OldX >= 0) && (OldX < 4) && (OldY >= 0) && (OldY < 4) && (OldZ >= 0) && (OldZ < 4))
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{
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(*m_WorkRnds)[x][y][z] = (*OldWorkRnds)[OldX][OldY][OldZ];
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}
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else
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{
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(*m_WorkRnds)[x][y][z] = (NOISE_DATATYPE)m_Noise.IntNoise3D(cx, cy, cz);
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}
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} // for z
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} // for y
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} // for x
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m_CurFloorX = a_NewFloorX;
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m_CurFloorY = a_NewFloorY;
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m_CurFloorZ = a_NewFloorZ;
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}
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////////////////////////////////////////////////////////////////////////////////
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// cNoise:
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cNoise::cNoise(int a_Seed) :
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m_Seed(a_Seed)
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{
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}
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cNoise::cNoise(const cNoise & a_Noise) :
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m_Seed(a_Noise.m_Seed)
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{
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}
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NOISE_DATATYPE cNoise::LinearNoise1D(NOISE_DATATYPE a_X) const
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{
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int BaseX = FAST_FLOOR(a_X);
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NOISE_DATATYPE FracX = a_X - BaseX;
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return LinearInterpolate(IntNoise1D(BaseX), IntNoise1D(BaseX + 1), FracX);
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}
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NOISE_DATATYPE cNoise::CosineNoise1D(NOISE_DATATYPE a_X) const
|
|
{
|
|
int BaseX = FAST_FLOOR(a_X);
|
|
NOISE_DATATYPE FracX = a_X - BaseX;
|
|
return CosineInterpolate(IntNoise1D(BaseX), IntNoise1D(BaseX + 1), FracX);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
NOISE_DATATYPE cNoise::CubicNoise1D(NOISE_DATATYPE a_X) const
|
|
{
|
|
int BaseX = FAST_FLOOR(a_X);
|
|
NOISE_DATATYPE FracX = a_X - BaseX;
|
|
return CubicInterpolate(IntNoise1D(BaseX - 1), IntNoise1D(BaseX), IntNoise1D(BaseX + 1), IntNoise1D(BaseX + 2), FracX);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
NOISE_DATATYPE cNoise::SmoothNoise1D(int a_X) const
|
|
{
|
|
return IntNoise1D(a_X) / 2 + IntNoise1D(a_X - 1) / 4 + IntNoise1D(a_X + 1) / 4;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
NOISE_DATATYPE cNoise::CubicNoise2D(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Y) const
|
|
{
|
|
const int BaseX = FAST_FLOOR(a_X);
|
|
const int BaseY = FAST_FLOOR(a_Y);
|
|
|
|
const NOISE_DATATYPE points[4][4] =
|
|
{
|
|
{ IntNoise2D(BaseX - 1, BaseY - 1), IntNoise2D(BaseX, BaseY - 1), IntNoise2D(BaseX + 1, BaseY - 1), IntNoise2D(BaseX + 2, BaseY - 1), },
|
|
{ IntNoise2D(BaseX - 1, BaseY), IntNoise2D(BaseX, BaseY), IntNoise2D(BaseX + 1, BaseY), IntNoise2D(BaseX + 2, BaseY), },
|
|
{ IntNoise2D(BaseX - 1, BaseY + 1), IntNoise2D(BaseX, BaseY + 1), IntNoise2D(BaseX + 1, BaseY + 1), IntNoise2D(BaseX + 2, BaseY + 1), },
|
|
{ IntNoise2D(BaseX - 1, BaseY + 2), IntNoise2D(BaseX, BaseY + 2), IntNoise2D(BaseX + 1, BaseY + 2), IntNoise2D(BaseX + 2, BaseY + 2), },
|
|
};
|
|
|
|
const NOISE_DATATYPE FracX = a_X - BaseX;
|
|
const NOISE_DATATYPE interp1 = CubicInterpolate(points[0][0], points[0][1], points[0][2], points[0][3], FracX);
|
|
const NOISE_DATATYPE interp2 = CubicInterpolate(points[1][0], points[1][1], points[1][2], points[1][3], FracX);
|
|
const NOISE_DATATYPE interp3 = CubicInterpolate(points[2][0], points[2][1], points[2][2], points[2][3], FracX);
|
|
const NOISE_DATATYPE interp4 = CubicInterpolate(points[3][0], points[3][1], points[3][2], points[3][3], FracX);
|
|
|
|
|
|
const NOISE_DATATYPE FracY = a_Y - BaseY;
|
|
return CubicInterpolate(interp1, interp2, interp3, interp4, FracY);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
NOISE_DATATYPE cNoise::CubicNoise3D(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Y, NOISE_DATATYPE a_Z) const
|
|
{
|
|
const int BaseX = FAST_FLOOR(a_X);
|
|
const int BaseY = FAST_FLOOR(a_Y);
|
|
const int BaseZ = FAST_FLOOR(a_Z);
|
|
|
|
const NOISE_DATATYPE points1[4][4] =
|
|
{
|
|
{ IntNoise3D(BaseX - 1, BaseY - 1, BaseZ - 1), IntNoise3D(BaseX, BaseY - 1, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY - 1, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY - 1, BaseZ - 1), },
|
|
{ IntNoise3D(BaseX - 1, BaseY, BaseZ - 1), IntNoise3D(BaseX, BaseY, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY, BaseZ - 1), },
|
|
{ IntNoise3D(BaseX - 1, BaseY + 1, BaseZ - 1), IntNoise3D(BaseX, BaseY + 1, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY + 1, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY + 1, BaseZ - 1), },
|
|
{ IntNoise3D(BaseX - 1, BaseY + 2, BaseZ - 1), IntNoise3D(BaseX, BaseY + 2, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY + 2, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY + 2, BaseZ - 1), },
|
|
};
|
|
|
|
const NOISE_DATATYPE FracX = (a_X) - BaseX;
|
|
const NOISE_DATATYPE x1interp1 = CubicInterpolate( points1[0][0], points1[0][1], points1[0][2], points1[0][3], FracX);
|
|
const NOISE_DATATYPE x1interp2 = CubicInterpolate( points1[1][0], points1[1][1], points1[1][2], points1[1][3], FracX);
|
|
const NOISE_DATATYPE x1interp3 = CubicInterpolate( points1[2][0], points1[2][1], points1[2][2], points1[2][3], FracX);
|
|
const NOISE_DATATYPE x1interp4 = CubicInterpolate( points1[3][0], points1[3][1], points1[3][2], points1[3][3], FracX);
|
|
|
|
const NOISE_DATATYPE points2[4][4] =
|
|
{
|
|
{ IntNoise3D(BaseX - 1, BaseY - 1, BaseZ), IntNoise3D(BaseX, BaseY - 1, BaseZ), IntNoise3D(BaseX + 1, BaseY - 1, BaseZ), IntNoise3D(BaseX + 2, BaseY - 1, BaseZ), },
|
|
{ IntNoise3D(BaseX - 1, BaseY, BaseZ), IntNoise3D(BaseX, BaseY, BaseZ), IntNoise3D(BaseX + 1, BaseY, BaseZ), IntNoise3D(BaseX + 2, BaseY, BaseZ), },
|
|
{ IntNoise3D(BaseX - 1, BaseY + 1, BaseZ), IntNoise3D(BaseX, BaseY + 1, BaseZ), IntNoise3D(BaseX + 1, BaseY + 1, BaseZ), IntNoise3D(BaseX + 2, BaseY + 1, BaseZ), },
|
|
{ IntNoise3D(BaseX - 1, BaseY + 2, BaseZ), IntNoise3D(BaseX, BaseY + 2, BaseZ), IntNoise3D(BaseX + 1, BaseY + 2, BaseZ), IntNoise3D(BaseX + 2, BaseY + 2, BaseZ), },
|
|
};
|
|
|
|
const NOISE_DATATYPE x2interp1 = CubicInterpolate( points2[0][0], points2[0][1], points2[0][2], points2[0][3], FracX);
|
|
const NOISE_DATATYPE x2interp2 = CubicInterpolate( points2[1][0], points2[1][1], points2[1][2], points2[1][3], FracX);
|
|
const NOISE_DATATYPE x2interp3 = CubicInterpolate( points2[2][0], points2[2][1], points2[2][2], points2[2][3], FracX);
|
|
const NOISE_DATATYPE x2interp4 = CubicInterpolate( points2[3][0], points2[3][1], points2[3][2], points2[3][3], FracX);
|
|
|
|
const NOISE_DATATYPE points3[4][4] =
|
|
{
|
|
{ IntNoise3D( BaseX-1, BaseY-1, BaseZ+1), IntNoise3D( BaseX, BaseY-1, BaseZ+1), IntNoise3D( BaseX+1, BaseY-1, BaseZ+1), IntNoise3D( BaseX+2, BaseY-1, BaseZ + 1), },
|
|
{ IntNoise3D( BaseX-1, BaseY, BaseZ+1), IntNoise3D( BaseX, BaseY, BaseZ+1), IntNoise3D( BaseX+1, BaseY, BaseZ+1), IntNoise3D( BaseX+2, BaseY, BaseZ + 1), },
|
|
{ IntNoise3D( BaseX-1, BaseY+1, BaseZ+1), IntNoise3D( BaseX, BaseY+1, BaseZ+1), IntNoise3D( BaseX+1, BaseY+1, BaseZ+1), IntNoise3D( BaseX+2, BaseY+1, BaseZ + 1), },
|
|
{ IntNoise3D( BaseX-1, BaseY+2, BaseZ+1), IntNoise3D( BaseX, BaseY+2, BaseZ+1), IntNoise3D( BaseX+1, BaseY+2, BaseZ+1), IntNoise3D( BaseX+2, BaseY+2, BaseZ + 1), },
|
|
};
|
|
|
|
const NOISE_DATATYPE x3interp1 = CubicInterpolate( points3[0][0], points3[0][1], points3[0][2], points3[0][3], FracX);
|
|
const NOISE_DATATYPE x3interp2 = CubicInterpolate( points3[1][0], points3[1][1], points3[1][2], points3[1][3], FracX);
|
|
const NOISE_DATATYPE x3interp3 = CubicInterpolate( points3[2][0], points3[2][1], points3[2][2], points3[2][3], FracX);
|
|
const NOISE_DATATYPE x3interp4 = CubicInterpolate( points3[3][0], points3[3][1], points3[3][2], points3[3][3], FracX);
|
|
|
|
const NOISE_DATATYPE points4[4][4] =
|
|
{
|
|
{ IntNoise3D( BaseX-1, BaseY-1, BaseZ+2), IntNoise3D( BaseX, BaseY-1, BaseZ+2), IntNoise3D( BaseX+1, BaseY-1, BaseZ+2), IntNoise3D( BaseX+2, BaseY-1, BaseZ+2), },
|
|
{ IntNoise3D( BaseX-1, BaseY, BaseZ+2), IntNoise3D( BaseX, BaseY, BaseZ+2), IntNoise3D( BaseX+1, BaseY, BaseZ+2), IntNoise3D( BaseX+2, BaseY, BaseZ+2), },
|
|
{ IntNoise3D( BaseX-1, BaseY+1, BaseZ+2), IntNoise3D( BaseX, BaseY+1, BaseZ+2), IntNoise3D( BaseX+1, BaseY+1, BaseZ+2), IntNoise3D( BaseX+2, BaseY+1, BaseZ+2), },
|
|
{ IntNoise3D( BaseX-1, BaseY+2, BaseZ+2), IntNoise3D( BaseX, BaseY+2, BaseZ+2), IntNoise3D( BaseX+1, BaseY+2, BaseZ+2), IntNoise3D( BaseX+2, BaseY+2, BaseZ+2), },
|
|
};
|
|
|
|
const NOISE_DATATYPE x4interp1 = CubicInterpolate( points4[0][0], points4[0][1], points4[0][2], points4[0][3], FracX);
|
|
const NOISE_DATATYPE x4interp2 = CubicInterpolate( points4[1][0], points4[1][1], points4[1][2], points4[1][3], FracX);
|
|
const NOISE_DATATYPE x4interp3 = CubicInterpolate( points4[2][0], points4[2][1], points4[2][2], points4[2][3], FracX);
|
|
const NOISE_DATATYPE x4interp4 = CubicInterpolate( points4[3][0], points4[3][1], points4[3][2], points4[3][3], FracX);
|
|
|
|
const NOISE_DATATYPE FracY = (a_Y) - BaseY;
|
|
const NOISE_DATATYPE yinterp1 = CubicInterpolate( x1interp1, x1interp2, x1interp3, x1interp4, FracY);
|
|
const NOISE_DATATYPE yinterp2 = CubicInterpolate( x2interp1, x2interp2, x2interp3, x2interp4, FracY);
|
|
const NOISE_DATATYPE yinterp3 = CubicInterpolate( x3interp1, x3interp2, x3interp3, x3interp4, FracY);
|
|
const NOISE_DATATYPE yinterp4 = CubicInterpolate( x4interp1, x4interp2, x4interp3, x4interp4, FracY);
|
|
|
|
const NOISE_DATATYPE FracZ = (a_Z) - BaseZ;
|
|
return CubicInterpolate( yinterp1, yinterp2, yinterp3, yinterp4, FracZ);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// cCubicNoise:
|
|
|
|
#ifdef _DEBUG
|
|
int cCubicNoise::m_NumSingleX = 0;
|
|
int cCubicNoise::m_NumSingleXY = 0;
|
|
int cCubicNoise::m_NumSingleY = 0;
|
|
int cCubicNoise::m_NumCalls = 0;
|
|
#endif // _DEBUG
|
|
|
|
cCubicNoise::cCubicNoise(int a_Seed) :
|
|
m_Noise(a_Seed)
|
|
{
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cCubicNoise::Generate2D(
|
|
NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
|
|
int a_SizeX, int a_SizeY, ///< Size of the array (num doubles), in each direction
|
|
NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
|
|
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY ///< Noise-space coords of the array in the Y direction
|
|
) const
|
|
{
|
|
ASSERT(a_SizeX > 0);
|
|
ASSERT(a_SizeY > 0);
|
|
ASSERT(a_SizeX < MAX_SIZE);
|
|
ASSERT(a_SizeY < MAX_SIZE);
|
|
ASSERT(a_StartX < a_EndX);
|
|
ASSERT(a_StartY < a_EndY);
|
|
|
|
// Calculate the integral and fractional parts of each coord:
|
|
int FloorX[MAX_SIZE];
|
|
int FloorY[MAX_SIZE];
|
|
NOISE_DATATYPE FracX[MAX_SIZE];
|
|
NOISE_DATATYPE FracY[MAX_SIZE];
|
|
int SameX[MAX_SIZE];
|
|
int SameY[MAX_SIZE];
|
|
int NumSameX, NumSameY;
|
|
CalcFloorFrac(a_SizeX, a_StartX, a_EndX, FloorX, FracX, SameX, NumSameX);
|
|
CalcFloorFrac(a_SizeY, a_StartY, a_EndY, FloorY, FracY, SameY, NumSameY);
|
|
|
|
cCubicCell2D Cell(m_Noise, a_Array, a_SizeX, a_SizeY, FracX, FracY);
|
|
|
|
Cell.InitWorkRnds(FloorX[0], FloorY[0]);
|
|
|
|
#ifdef _DEBUG
|
|
// Statistics on the noise-space coords:
|
|
if (NumSameX == 1)
|
|
{
|
|
m_NumSingleX++;
|
|
if (NumSameY == 1)
|
|
{
|
|
m_NumSingleXY++;
|
|
}
|
|
}
|
|
if (NumSameY == 1)
|
|
{
|
|
m_NumSingleY++;
|
|
}
|
|
m_NumCalls++;
|
|
#endif // _DEBUG
|
|
|
|
// Calculate query values using Cell:
|
|
int FromY = 0;
|
|
for (int y = 0; y < NumSameY; y++)
|
|
{
|
|
int ToY = FromY + SameY[y];
|
|
int FromX = 0;
|
|
int CurFloorY = FloorY[FromY];
|
|
for (int x = 0; x < NumSameX; x++)
|
|
{
|
|
int ToX = FromX + SameX[x];
|
|
Cell.Generate(FromX, ToX, FromY, ToY);
|
|
Cell.Move(FloorX[ToX], CurFloorY);
|
|
FromX = ToX;
|
|
}
|
|
Cell.Move(FloorX[0], FloorY[ToY]);
|
|
FromY = ToY;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cCubicNoise::Generate3D(
|
|
NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
|
|
int a_SizeX, int a_SizeY, int a_SizeZ, ///< Size of the array (num doubles), in each direction
|
|
NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
|
|
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction
|
|
NOISE_DATATYPE a_StartZ, NOISE_DATATYPE a_EndZ ///< Noise-space coords of the array in the Y direction
|
|
) const
|
|
{
|
|
ASSERT(a_SizeX < MAX_SIZE);
|
|
ASSERT(a_SizeY < MAX_SIZE);
|
|
ASSERT(a_SizeZ < MAX_SIZE);
|
|
ASSERT(a_StartX < a_EndX);
|
|
ASSERT(a_StartY < a_EndY);
|
|
ASSERT(a_StartZ < a_EndZ);
|
|
|
|
// Calculate the integral and fractional parts of each coord:
|
|
int FloorX[MAX_SIZE];
|
|
int FloorY[MAX_SIZE];
|
|
int FloorZ[MAX_SIZE];
|
|
NOISE_DATATYPE FracX[MAX_SIZE];
|
|
NOISE_DATATYPE FracY[MAX_SIZE];
|
|
NOISE_DATATYPE FracZ[MAX_SIZE];
|
|
int SameX[MAX_SIZE];
|
|
int SameY[MAX_SIZE];
|
|
int SameZ[MAX_SIZE];
|
|
int NumSameX, NumSameY, NumSameZ;
|
|
CalcFloorFrac(a_SizeX, a_StartX, a_EndX, FloorX, FracX, SameX, NumSameX);
|
|
CalcFloorFrac(a_SizeY, a_StartY, a_EndY, FloorY, FracY, SameY, NumSameY);
|
|
CalcFloorFrac(a_SizeZ, a_StartZ, a_EndZ, FloorZ, FracZ, SameZ, NumSameZ);
|
|
|
|
cCubicCell3D Cell(
|
|
m_Noise, a_Array,
|
|
a_SizeX, a_SizeY, a_SizeZ,
|
|
FracX, FracY, FracZ
|
|
);
|
|
|
|
Cell.InitWorkRnds(FloorX[0], FloorY[0], FloorZ[0]);
|
|
|
|
// Calculate query values using Cell:
|
|
int FromZ = 0;
|
|
for (int z = 0; z < NumSameZ; z++)
|
|
{
|
|
int ToZ = FromZ + SameZ[z];
|
|
int CurFloorZ = FloorZ[FromZ];
|
|
int FromY = 0;
|
|
for (int y = 0; y < NumSameY; y++)
|
|
{
|
|
int ToY = FromY + SameY[y];
|
|
int CurFloorY = FloorY[FromY];
|
|
int FromX = 0;
|
|
for (int x = 0; x < NumSameX; x++)
|
|
{
|
|
int ToX = FromX + SameX[x];
|
|
Cell.Generate(FromX, ToX, FromY, ToY, FromZ, ToZ);
|
|
Cell.Move(FloorX[ToX], CurFloorY, CurFloorZ);
|
|
FromX = ToX;
|
|
}
|
|
Cell.Move(FloorX[0], FloorY[ToY], CurFloorZ);
|
|
FromY = ToY;
|
|
} // for y
|
|
Cell.Move(FloorX[0], FloorY[0], FloorZ[ToZ]);
|
|
FromZ = ToZ;
|
|
} // for z
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cCubicNoise::CalcFloorFrac(
|
|
int a_Size,
|
|
NOISE_DATATYPE a_Start, NOISE_DATATYPE a_End,
|
|
int * a_Floor, NOISE_DATATYPE * a_Frac,
|
|
int * a_Same, int & a_NumSame
|
|
) const
|
|
{
|
|
ASSERT(a_Size > 0);
|
|
|
|
NOISE_DATATYPE val = a_Start;
|
|
NOISE_DATATYPE dif = (a_End - a_Start) / (a_Size - 1);
|
|
for (int i = 0; i < a_Size; i++)
|
|
{
|
|
a_Floor[i] = FAST_FLOOR(val);
|
|
a_Frac[i] = val - a_Floor[i];
|
|
val += dif;
|
|
}
|
|
|
|
// Mark up the same floor values into a_Same / a_NumSame:
|
|
int CurFloor = a_Floor[0];
|
|
int LastSame = 0;
|
|
a_NumSame = 0;
|
|
for (int i = 1; i < a_Size; i++)
|
|
{
|
|
if (a_Floor[i] != CurFloor)
|
|
{
|
|
a_Same[a_NumSame] = i - LastSame;
|
|
LastSame = i;
|
|
a_NumSame += 1;
|
|
CurFloor = a_Floor[i];
|
|
}
|
|
} // for i - a_Floor[]
|
|
if (LastSame < a_Size)
|
|
{
|
|
a_Same[a_NumSame] = a_Size - LastSame;
|
|
a_NumSame += 1;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// cPerlinNoise:
|
|
|
|
cPerlinNoise::cPerlinNoise(void) :
|
|
m_Seed(0)
|
|
{
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
cPerlinNoise::cPerlinNoise(int a_Seed) :
|
|
m_Seed(a_Seed)
|
|
{
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cPerlinNoise::SetSeed(int a_Seed)
|
|
{
|
|
m_Seed = a_Seed;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cPerlinNoise::AddOctave(float a_Frequency, float a_Amplitude)
|
|
{
|
|
m_Octaves.push_back(cOctave(m_Seed * ((int)m_Octaves.size() + 4) * 4 + 1024, a_Frequency, a_Amplitude));
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cPerlinNoise::Generate2D(
|
|
NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
|
|
int a_SizeX, int a_SizeY, ///< Count of the array, in each direction
|
|
NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
|
|
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction
|
|
NOISE_DATATYPE * a_Workspace ///< Workspace that this function can use and trash
|
|
) const
|
|
{
|
|
if (m_Octaves.empty())
|
|
{
|
|
// No work to be done
|
|
ASSERT(!"Perlin: No octaves to generate!");
|
|
return;
|
|
}
|
|
|
|
bool ShouldFreeWorkspace = (a_Workspace == NULL);
|
|
int ArrayCount = a_SizeX * a_SizeY;
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
a_Workspace = new NOISE_DATATYPE[ArrayCount];
|
|
}
|
|
|
|
// Generate the first octave directly into array:
|
|
const cOctave & FirstOctave = m_Octaves.front();
|
|
|
|
FirstOctave.m_Noise.Generate2D(
|
|
a_Workspace, a_SizeX, a_SizeY,
|
|
a_StartX * FirstOctave.m_Frequency, a_EndX * FirstOctave.m_Frequency,
|
|
a_StartY * FirstOctave.m_Frequency, a_EndY * FirstOctave.m_Frequency
|
|
);
|
|
NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] = a_Workspace[i] * Amplitude;
|
|
}
|
|
|
|
// Add each octave:
|
|
for (cOctaves::const_iterator itr = m_Octaves.begin() + 1, end = m_Octaves.end(); itr != end; ++itr)
|
|
{
|
|
// Generate cubic noise for the octave:
|
|
itr->m_Noise.Generate2D(
|
|
a_Workspace, a_SizeX, a_SizeY,
|
|
a_StartX * itr->m_Frequency, a_EndX * itr->m_Frequency,
|
|
a_StartY * itr->m_Frequency, a_EndY * itr->m_Frequency
|
|
);
|
|
// Add the cubic noise into the output:
|
|
NOISE_DATATYPE Amplitude = itr->m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] += a_Workspace[i] * Amplitude;
|
|
}
|
|
}
|
|
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
delete[] a_Workspace;
|
|
a_Workspace = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cPerlinNoise::Generate3D(
|
|
NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y + a_SizeX * a_SizeY * z]
|
|
int a_SizeX, int a_SizeY, int a_SizeZ, ///< Count of the array, in each direction
|
|
NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
|
|
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction
|
|
NOISE_DATATYPE a_StartZ, NOISE_DATATYPE a_EndZ, ///< Noise-space coords of the array in the Z direction
|
|
NOISE_DATATYPE * a_Workspace ///< Workspace that this function can use and trash
|
|
) const
|
|
{
|
|
if (m_Octaves.empty())
|
|
{
|
|
// No work to be done
|
|
ASSERT(!"Perlin: No octaves to generate!");
|
|
return;
|
|
}
|
|
|
|
bool ShouldFreeWorkspace = (a_Workspace == NULL);
|
|
int ArrayCount = a_SizeX * a_SizeY * a_SizeZ;
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
a_Workspace = new NOISE_DATATYPE[ArrayCount];
|
|
}
|
|
|
|
// Generate the first octave directly into array:
|
|
const cOctave & FirstOctave = m_Octaves.front();
|
|
|
|
FirstOctave.m_Noise.Generate3D(
|
|
a_Workspace, a_SizeX, a_SizeY, a_SizeZ,
|
|
a_StartX * FirstOctave.m_Frequency, a_EndX * FirstOctave.m_Frequency,
|
|
a_StartY * FirstOctave.m_Frequency, a_EndY * FirstOctave.m_Frequency,
|
|
a_StartZ * FirstOctave.m_Frequency, a_EndZ * FirstOctave.m_Frequency
|
|
);
|
|
NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] = a_Workspace[i] * Amplitude;
|
|
}
|
|
|
|
// Add each octave:
|
|
for (cOctaves::const_iterator itr = m_Octaves.begin() + 1, end = m_Octaves.end(); itr != end; ++itr)
|
|
{
|
|
// Generate cubic noise for the octave:
|
|
itr->m_Noise.Generate3D(
|
|
a_Workspace, a_SizeX, a_SizeY, a_SizeZ,
|
|
a_StartX * itr->m_Frequency, a_EndX * itr->m_Frequency,
|
|
a_StartY * itr->m_Frequency, a_EndY * itr->m_Frequency,
|
|
a_StartZ * itr->m_Frequency, a_EndZ * itr->m_Frequency
|
|
);
|
|
// Add the cubic noise into the output:
|
|
NOISE_DATATYPE Amplitude = itr->m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] += a_Workspace[i] * Amplitude;
|
|
}
|
|
}
|
|
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
delete[] a_Workspace;
|
|
a_Workspace = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// cRidgedMultiNoise:
|
|
|
|
cRidgedMultiNoise::cRidgedMultiNoise(void) :
|
|
m_Seed(0)
|
|
{
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
cRidgedMultiNoise::cRidgedMultiNoise(int a_Seed) :
|
|
m_Seed(a_Seed)
|
|
{
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cRidgedMultiNoise::SetSeed(int a_Seed)
|
|
{
|
|
m_Seed = a_Seed;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cRidgedMultiNoise::AddOctave(float a_Frequency, float a_Amplitude)
|
|
{
|
|
m_Octaves.push_back(cOctave(m_Seed * ((int)m_Octaves.size() + 4) * 4 + 1024, a_Frequency, a_Amplitude));
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cRidgedMultiNoise::Generate2D(
|
|
NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y]
|
|
int a_SizeX, int a_SizeY, ///< Count of the array, in each direction
|
|
NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
|
|
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction
|
|
NOISE_DATATYPE * a_Workspace ///< Workspace that this function can use and trash
|
|
) const
|
|
{
|
|
if (m_Octaves.empty())
|
|
{
|
|
// No work to be done
|
|
ASSERT(!"RidgedMulti: No octaves to generate!");
|
|
return;
|
|
}
|
|
|
|
bool ShouldFreeWorkspace = (a_Workspace == NULL);
|
|
int ArrayCount = a_SizeX * a_SizeY;
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
a_Workspace = new NOISE_DATATYPE[ArrayCount];
|
|
}
|
|
|
|
// Generate the first octave directly into array:
|
|
const cOctave & FirstOctave = m_Octaves.front();
|
|
|
|
FirstOctave.m_Noise.Generate2D(
|
|
a_Workspace, a_SizeX, a_SizeY,
|
|
a_StartX * FirstOctave.m_Frequency, a_EndX * FirstOctave.m_Frequency,
|
|
a_StartY * FirstOctave.m_Frequency, a_EndY * FirstOctave.m_Frequency
|
|
);
|
|
NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] = fabs(a_Workspace[i] * Amplitude);
|
|
}
|
|
|
|
// Add each octave:
|
|
for (cOctaves::const_iterator itr = m_Octaves.begin() + 1, end = m_Octaves.end(); itr != end; ++itr)
|
|
{
|
|
// Generate cubic noise for the octave:
|
|
itr->m_Noise.Generate2D(
|
|
a_Workspace, a_SizeX, a_SizeY,
|
|
a_StartX * itr->m_Frequency, a_EndX * itr->m_Frequency,
|
|
a_StartY * itr->m_Frequency, a_EndY * itr->m_Frequency
|
|
);
|
|
// Add the cubic noise into the output:
|
|
NOISE_DATATYPE Amplitude = itr->m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] += fabs(a_Workspace[i] * Amplitude);
|
|
}
|
|
}
|
|
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
delete[] a_Workspace;
|
|
a_Workspace = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cRidgedMultiNoise::Generate3D(
|
|
NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y + a_SizeX * a_SizeY * z]
|
|
int a_SizeX, int a_SizeY, int a_SizeZ, ///< Count of the array, in each direction
|
|
NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
|
|
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction
|
|
NOISE_DATATYPE a_StartZ, NOISE_DATATYPE a_EndZ, ///< Noise-space coords of the array in the Z direction
|
|
NOISE_DATATYPE * a_Workspace ///< Workspace that this function can use and trash
|
|
) const
|
|
{
|
|
if (m_Octaves.empty())
|
|
{
|
|
// No work to be done
|
|
ASSERT(!"RidgedMulti: No octaves to generate!");
|
|
return;
|
|
}
|
|
|
|
bool ShouldFreeWorkspace = (a_Workspace == NULL);
|
|
int ArrayCount = a_SizeX * a_SizeY * a_SizeZ;
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
a_Workspace = new NOISE_DATATYPE[ArrayCount];
|
|
}
|
|
|
|
// Generate the first octave directly into array:
|
|
const cOctave & FirstOctave = m_Octaves.front();
|
|
|
|
FirstOctave.m_Noise.Generate3D(
|
|
a_Workspace, a_SizeX, a_SizeY, a_SizeZ,
|
|
a_StartX * FirstOctave.m_Frequency, a_EndX * FirstOctave.m_Frequency,
|
|
a_StartY * FirstOctave.m_Frequency, a_EndY * FirstOctave.m_Frequency,
|
|
a_StartZ * FirstOctave.m_Frequency, a_EndZ * FirstOctave.m_Frequency
|
|
);
|
|
NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] = a_Workspace[i] * Amplitude;
|
|
}
|
|
|
|
// Add each octave:
|
|
for (cOctaves::const_iterator itr = m_Octaves.begin() + 1, end = m_Octaves.end(); itr != end; ++itr)
|
|
{
|
|
// Generate cubic noise for the octave:
|
|
itr->m_Noise.Generate3D(
|
|
a_Workspace, a_SizeX, a_SizeY, a_SizeZ,
|
|
a_StartX * itr->m_Frequency, a_EndX * itr->m_Frequency,
|
|
a_StartY * itr->m_Frequency, a_EndY * itr->m_Frequency,
|
|
a_StartZ * itr->m_Frequency, a_EndZ * itr->m_Frequency
|
|
);
|
|
// Add the cubic noise into the output:
|
|
NOISE_DATATYPE Amplitude = itr->m_Amplitude;
|
|
for (int i = 0; i < ArrayCount; i++)
|
|
{
|
|
a_Array[i] += a_Workspace[i] * Amplitude;
|
|
}
|
|
}
|
|
|
|
if (ShouldFreeWorkspace)
|
|
{
|
|
delete[] a_Workspace;
|
|
a_Workspace = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|