Added a cInterpolNoise template for faster noise generator.
Used an instance of it in the Noise3D generator.
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@ -6,6 +6,7 @@
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#include "Globals.h"
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#include "Noise3DGenerator.h"
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#include "../OSSupport/File.h"
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#include "../OSSupport/Timer.h"
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#include "../IniFile.h"
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#include "../LinearInterpolation.h"
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#include "../LinearUpscale.h"
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@ -61,6 +62,50 @@ public:
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#if 0
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// Perform speed test of the cInterpolNoise class
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static class cInterpolNoiseSpeedTest
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{
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public:
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cInterpolNoiseSpeedTest(void)
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{
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printf("Evaluating 3D noise performance...\n");
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static const int SIZE_X = 128;
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static const int SIZE_Y = 128;
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static const int SIZE_Z = 128;
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static const NOISE_DATATYPE MUL = 80;
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std::unique_ptr<NOISE_DATATYPE[]> arr(new NOISE_DATATYPE[SIZE_X * SIZE_Y * SIZE_Z]);
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cTimer timer;
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// Test the cInterpolNoise:
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cInterpolNoise<Interp5Deg> interpNoise(1);
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long long start = timer.GetNowTime();
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for (int i = 0; i < 30; i++)
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{
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interpNoise.Generate3D(arr.get(), SIZE_X, SIZE_Y, SIZE_Z, MUL * i, MUL * i + MUL, 0, MUL, 0, MUL);
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}
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long long end = timer.GetNowTime();
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printf("InterpolNoise took %.02f sec\n", static_cast<float>(end - start) / 1000);
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// Test the cCubicNoise:
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cCubicNoise cubicNoise(1);
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start = timer.GetNowTime();
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for (int i = 0; i < 30; i++)
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{
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cubicNoise.Generate3D(arr.get(), SIZE_X, SIZE_Y, SIZE_Z, MUL * i, MUL * i + MUL, 0, MUL, 0, MUL);
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}
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end = timer.GetNowTime();
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printf("CubicNoise took %.02f sec\n", static_cast<float>(end - start) / 1000);
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printf("3D noise performance comparison finished.\n");
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}
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} g_InterpolNoiseSpeedTest;
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#endif
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////////////////////////////////////////////////////////////////////////////////
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// cNoise3DGenerator:
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@ -69,9 +114,11 @@ cNoise3DGenerator::cNoise3DGenerator(cChunkGenerator & a_ChunkGenerator) :
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m_Perlin(1000),
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m_Cubic(1000)
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{
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m_Perlin.AddOctave(1, (NOISE_DATATYPE)0.5);
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m_Perlin.AddOctave((NOISE_DATATYPE)0.5, 1);
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m_Perlin.AddOctave((NOISE_DATATYPE)0.5, 2);
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m_Perlin.AddOctave(1, 1);
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m_Perlin.AddOctave(2, 0.5);
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m_Perlin.AddOctave(4, 0.25);
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m_Perlin.AddOctave(8, 0.125);
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m_Perlin.AddOctave(16, 0.0625);
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#if 0
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// DEBUG: Test the noise generation:
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@ -14,6 +14,7 @@
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#include "ComposableGenerator.h"
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#include "../Noise/Noise.h"
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#include "../Noise/InterpolNoise.h"
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@ -43,7 +44,9 @@ protected:
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static const int DIM_Y = 1 + cChunkDef::Height / UPSCALE_Y;
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static const int DIM_Z = 1 + cChunkDef::Width / UPSCALE_Z;
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cPerlinNoise m_Perlin; // The base 3D noise source for the actual composition
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/** The base 3D noise source for the actual composition */
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cOctavedNoise<cInterp5DegNoise> m_Perlin;
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cCubicNoise m_Cubic; // The noise used for heightmap directing
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int m_SeaLevel;
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385
src/Noise/InterpolNoise.h
Normal file
385
src/Noise/InterpolNoise.h
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@ -0,0 +1,385 @@
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// InterpolNoise.h
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// Implements the cInterpolNoise class template representing a noise that interpolates the values between integer coords from a single set of neighbors
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#pragma once
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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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// cInterpolCell3D:
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/** Holds a cache of the last calculated integral noise values and interpolates between them en masse.
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Provides a massive optimization for cInterpolNoise.
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Works by calculating multiple noise values (that have the same integral noise coords) at once. The underlying noise values
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needn't be recalculated for these values, only the interpolation is done within the unit cube. */
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template <typename T>
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class cInterpolCell3D
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{
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public:
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cInterpolCell3D(
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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_CurFloorX(0),
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m_CurFloorY(0),
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m_CurFloorZ(0),
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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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/** Generates part of the output array using current m_WorkRnds[]. */
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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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{
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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[2][2];
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NOISE_DATATYPE FracZ = T::coeff(m_FracZ[z]);
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for (int x = 0; x < 2; x++)
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{
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for (int y = 0; y < 2; y++)
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{
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Interp2[x][y] = Lerp((*m_WorkRnds)[x][y][0], (*m_WorkRnds)[x][y][1], 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[2];
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NOISE_DATATYPE FracY = T::coeff(m_FracY[y]);
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Interp[0] = Lerp(Interp2[0][0], Interp2[0][1], FracY);
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Interp[1] = Lerp(Interp2[1][0], Interp2[1][1], 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++] = Lerp(Interp[0], Interp[1], T::coeff(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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/** 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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{
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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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(*m_WorkRnds)[0][0][0] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX, m_CurFloorY, m_CurFloorZ);
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(*m_WorkRnds)[0][0][1] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX, m_CurFloorY, m_CurFloorZ + 1);
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(*m_WorkRnds)[0][1][0] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX, m_CurFloorY + 1, m_CurFloorZ);
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(*m_WorkRnds)[0][1][1] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX, m_CurFloorY + 1, m_CurFloorZ + 1);
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(*m_WorkRnds)[1][0][0] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX + 1, m_CurFloorY, m_CurFloorZ);
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(*m_WorkRnds)[1][0][1] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX + 1, m_CurFloorY, m_CurFloorZ + 1);
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(*m_WorkRnds)[1][1][0] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX + 1, m_CurFloorY + 1, m_CurFloorZ);
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(*m_WorkRnds)[1][1][1] = (NOISE_DATATYPE)m_Noise.IntNoise3D(m_CurFloorX + 1, m_CurFloorY + 1, m_CurFloorZ + 1);
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}
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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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{
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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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// TODO: Try out if simply calculating all 8 elements each time is faster than this monster loop
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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 < 2; x++)
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{
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int cx = a_NewFloorX + x;
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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 < 2; y++)
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{
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int cy = a_NewFloorY + y;
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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 < 2; z++)
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{
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int cz = a_NewFloorZ + z;
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int OldZ = z - DiffZ;
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if ((OldX >= 0) && (OldX < 2) && (OldY >= 0) && (OldY < 2) && (OldZ >= 0) && (OldZ < 2))
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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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protected:
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typedef NOISE_DATATYPE Workspace[2][2][2];
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/** The noise used for generating the values at integral coords. */
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const cNoise & m_Noise;
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/** The current random values; points to either m_Workspace1 or m_Workspace2 (doublebuffering) */
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Workspace * m_WorkRnds;
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/** Buffer 1 for workspace doublebuffering, used in Move() */
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Workspace m_Workspace1;
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/** Buffer 2 for workspace doublebuffering, used in Move() */
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Workspace m_Workspace2;
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/** The integral coords of the currently calculated WorkRnds[] */
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int m_CurFloorX, m_CurFloorY, m_CurFloorZ;
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/** The output array where the noise is calculated. */
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NOISE_DATATYPE * m_Array;
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/** Dimensions of the output array. */
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int m_SizeX, m_SizeY, m_SizeZ;
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/** Arrays holding the fractional values of the coords in each direction. */
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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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////////////////////////////////////////////////////////////////////////////////
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// cInterpolNoise:
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template <typename T>
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class cInterpolNoise
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{
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/** Maximum size, for each direction, of the generated array. */
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static const int MAX_SIZE = 256;
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public:
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cInterpolNoise(int a_Seed):
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m_Noise(a_Seed)
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{
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}
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/** Sets a new seed for the generators. Relays the seed to the underlying noise. */
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void SetSeed(int a_Seed)
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{
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m_Noise.SetSeed(a_Seed);
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}
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/** Fills a 2D array with the values of the noise. */
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void Generate2D(
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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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NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
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NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY ///< Noise-space coords of the array in the Y direction
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) const
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{
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// Check params:
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ASSERT(a_SizeX > 1);
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ASSERT(a_SizeY > 1);
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// Generate the noise:
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size_t idx = 0;
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for (int y = 0; y < a_SizeY; y++)
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{
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NOISE_DATATYPE ratioY = static_cast<NOISE_DATATYPE>(y) / (a_SizeY - 1);
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NOISE_DATATYPE noiseY = Lerp(a_StartY, a_EndY, ratioY);
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int noiseYInt = FAST_FLOOR(noiseY);
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NOISE_DATATYPE ratioY = typename T(noiseY - static_cast<NOISE_DATATYPE>(noiseYInt));
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for (int x = 0; x < a_SizeX; x++)
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{
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NOISE_DATATYPE ratioX = static_cast<NOISE_DATATYPE>(x) / (a_SizeX - 1);
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NOISE_DATATYPE noiseX = Lerp(a_StartX, a_EndX, ratioX);
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int noiseXInt = FAST_FLOOR(noiseX);
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NOISE_DATATYPE ratioX = typename T(noiseX - static_cast<NOISE_DATATYPE>(noiseXInt));
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NOISE_DATATYPE valx0y0 = m_Noise.IntNoise2D(noiseXInt, noiseYInt);
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NOISE_DATATYPE valx1y0 = m_Noise.IntNoise2D(noiseXInt + 1, noiseYInt);
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NOISE_DATATYPE valx0y1 = m_Noise.IntNoise2D(noiseXInt, noiseYInt + 1);
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NOISE_DATATYPE valx1y1 = m_Noise.IntNoise2D(noiseXInt + 1, noiseYInt + 1);
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NOISE_DATATYPE valx0 = Lerp(valx0y0, valx0y1, ratioY);
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NOISE_DATATYPE valx1 = Lerp(valx1y1, valx1y1, ratioY);
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a_Array[idx++] = Lerp(valx0, valx1, ratioX);
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} // for x
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} // for y
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}
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/** Fills a 3D array with the values of the noise. */
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void Generate3D(
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NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y + a_SizeX * a_SizeY * z]
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int a_SizeX, int a_SizeY, int a_SizeZ, ///< Count of the array, in each direction
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NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction
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NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction
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NOISE_DATATYPE a_StartZ, NOISE_DATATYPE a_EndZ ///< Noise-space coords of the array in the Z direction
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) const
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{
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// Check params:
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ASSERT(a_SizeX > 1);
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ASSERT(a_SizeY > 1);
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ASSERT(a_SizeX < MAX_SIZE);
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ASSERT(a_SizeY < MAX_SIZE);
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ASSERT(a_SizeZ < MAX_SIZE);
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ASSERT(a_StartX < a_EndX);
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ASSERT(a_StartY < a_EndY);
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ASSERT(a_StartZ < a_EndZ);
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// Calculate the integral and fractional parts of each coord:
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int FloorX[MAX_SIZE];
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int FloorY[MAX_SIZE];
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int FloorZ[MAX_SIZE];
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NOISE_DATATYPE FracX[MAX_SIZE];
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NOISE_DATATYPE FracY[MAX_SIZE];
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NOISE_DATATYPE FracZ[MAX_SIZE];
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int SameX[MAX_SIZE];
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int SameY[MAX_SIZE];
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int SameZ[MAX_SIZE];
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int NumSameX, NumSameY, NumSameZ;
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CalcFloorFrac(a_SizeX, a_StartX, a_EndX, FloorX, FracX, SameX, NumSameX);
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CalcFloorFrac(a_SizeY, a_StartY, a_EndY, FloorY, FracY, SameY, NumSameY);
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CalcFloorFrac(a_SizeZ, a_StartZ, a_EndZ, FloorZ, FracZ, SameZ, NumSameZ);
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cInterpolCell3D<T> Cell(
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m_Noise, a_Array,
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a_SizeX, a_SizeY, a_SizeZ,
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FracX, FracY, FracZ
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);
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Cell.InitWorkRnds(FloorX[0], FloorY[0], FloorZ[0]);
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// Calculate query values using Cell:
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int FromZ = 0;
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for (int z = 0; z < NumSameZ; z++)
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{
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int ToZ = FromZ + SameZ[z];
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int CurFloorZ = FloorZ[FromZ];
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int FromY = 0;
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for (int y = 0; y < NumSameY; y++)
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{
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int ToY = FromY + SameY[y];
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int CurFloorY = FloorY[FromY];
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int FromX = 0;
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for (int x = 0; x < NumSameX; x++)
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{
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int ToX = FromX + SameX[x];
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Cell.Generate(FromX, ToX, FromY, ToY, FromZ, ToZ);
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Cell.Move(FloorX[ToX], CurFloorY, CurFloorZ);
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FromX = ToX;
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}
|
||||
Cell.Move(FloorX[0], FloorY[ToY], CurFloorZ);
|
||||
FromY = ToY;
|
||||
} // for y
|
||||
Cell.Move(FloorX[0], FloorY[0], FloorZ[ToZ]);
|
||||
FromZ = ToZ;
|
||||
} // for z
|
||||
}
|
||||
|
||||
protected:
|
||||
|
||||
/** The noise used for the underlying value generation. */
|
||||
cNoise m_Noise;
|
||||
|
||||
|
||||
/** Calculates the integral and fractional parts along one axis.
|
||||
a_Floor will receive the integral parts (array of a_Size ints).
|
||||
a_Frac will receive the fractional parts (array of a_Size floats).
|
||||
a_Same will receive the counts of items that have the same integral parts (array of up to a_Size ints).
|
||||
a_NumSame will receive the count of a_Same elements (total count of different integral parts). */
|
||||
void 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);
|
||||
|
||||
// Calculate the floor and frac values:
|
||||
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;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
/** A fifth-degree curve for interpolating.
|
||||
Implemented as a functor for better chance of inlining. */
|
||||
struct Interp5Deg
|
||||
{
|
||||
static NOISE_DATATYPE coeff(NOISE_DATATYPE a_Val)
|
||||
{
|
||||
return a_Val * a_Val * a_Val * (a_Val * (a_Val * 6 - 15) + 10);
|
||||
}
|
||||
};
|
||||
|
||||
typedef cInterpolNoise<Interp5Deg> cInterp5DegNoise;
|
||||
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user