200 lines
7.5 KiB
Text
200 lines
7.5 KiB
Text
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// Copyright 2020 Phyronnaz
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#pragma once
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#include "FastNoise/VoxelFastNoiseLUT.h"
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#include "FastNoise/VoxelFastNoiseMath.inl"
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// THIS CODE IS A MODIFIED VERSION OF FAST NOISE: SEE LICENSE BELOW
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//
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// MIT License
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//
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// Copyright(c) 2017 Jordan Peck
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files(the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions :
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// The developer's email is jorzixdan.me2@gzixmail.com (for great email, take
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// off every 'zix'.)
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//
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// VERSION: 0.4.1
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// ReSharper disable CppUE4CodingStandardNamingViolationWarning
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FN_FORCEINLINE_MATH uint8 FVoxelFastNoiseLUT::Index2D_12(uint8 offset, int32 x, int32 y) const
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{
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return Perm12[(x & 0xff) + Perm[(y & 0xff) + offset]];
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}
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FN_FORCEINLINE_MATH uint8 FVoxelFastNoiseLUT::Index3D_12(uint8 offset, int32 x, int32 y, int32 z) const
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{
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return Perm12[(x & 0xff) + Perm[(y & 0xff) + Perm[(z & 0xff) + offset]]];
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}
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FN_FORCEINLINE_MATH uint8 FVoxelFastNoiseLUT::Index4D_32(uint8 offset, int32 x, int32 y, int32 z, int32 w) const
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{
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return Perm[(x & 0xff) + Perm[(y & 0xff) + Perm[(z & 0xff) + Perm[(w & 0xff) + offset]]]] & 31;
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}
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FN_FORCEINLINE_MATH uint8 FVoxelFastNoiseLUT::Index2D_256(uint8 offset, int32 x, int32 y) const
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{
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return Perm[(x & 0xff) + Perm[(y & 0xff) + offset]];
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}
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FN_FORCEINLINE_MATH uint8 FVoxelFastNoiseLUT::Index3D_256(uint8 offset, int32 x, int32 y, int32 z) const
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{
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return Perm[(x & 0xff) + Perm[(y & 0xff) + Perm[(z & 0xff) + offset]]];
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}
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FN_FORCEINLINE_MATH uint8 FVoxelFastNoiseLUT::Index4D_256(uint8 offset, int32 x, int32 y, int32 z, int32 w) const
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{
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return Perm[(x & 0xff) + Perm[(y & 0xff) + Perm[(z & 0xff) + Perm[(w & 0xff) + offset]]]];
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}
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::ValCoord2DFast(uint8 offset, int32 x, int32 y) const
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{
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return VAL_LUT[Index2D_256(offset, x, y)];
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::ValCoord3DFast(uint8 offset, int32 x, int32 y, int32 z) const
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{
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return VAL_LUT[Index3D_256(offset, x, y, z)];
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}
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::GradCoord2D(uint8 offset, int32 x, int32 y, v_flt xd, v_flt yd) const
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{
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const uint8 lutPos = Index2D_12(offset, x, y);
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return xd * GRAD_X[lutPos] + yd * GRAD_Y[lutPos];
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::GradCoord2D(uint8 offset, int32 x, int32 y, v_flt xd, v_flt yd, v_flt& outGradX, v_flt& outGradY) const
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{
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uint8 lutPos = Index2D_12(offset, x, y);
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outGradX = GRAD_X[lutPos];
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outGradY = GRAD_Y[lutPos];
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return xd * GRAD_X[lutPos] + yd * GRAD_Y[lutPos];
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::GradCoord3D(uint8 offset, int32 x, int32 y, int32 z, v_flt xd, v_flt yd, v_flt zd) const
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{
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uint8 lutPos = Index3D_12(offset, x, y, z);
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return xd * GRAD_X[lutPos] + yd * GRAD_Y[lutPos] + zd * GRAD_Z[lutPos];
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::GradCoord3D(uint8 offset, int32 x, int32 y, int32 z, v_flt xd, v_flt yd, v_flt zd, v_flt& outGradX, v_flt& outGradY, v_flt& outGradZ) const
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{
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uint8 lutPos = Index3D_12(offset, x, y, z);
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outGradX = GRAD_X[lutPos];
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outGradY = GRAD_Y[lutPos];
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outGradZ = GRAD_Z[lutPos];
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return xd * GRAD_X[lutPos] + yd * GRAD_Y[lutPos] + zd * GRAD_Z[lutPos];
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::GradCoord4D(uint8 offset, int32 x, int32 y, int32 z, int32 w, v_flt xd, v_flt yd, v_flt zd, v_flt wd) const
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{
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uint8 lutPos = Index4D_32(offset, x, y, z, w) << 2;
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return xd * GRAD_4D[lutPos] + yd * GRAD_4D[lutPos + 1] + zd * GRAD_4D[lutPos + 2] + wd * GRAD_4D[lutPos + 3];
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}
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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FN_FORCEINLINE_MATH VectorRegister FVoxelFastNoiseLUT::ValCoord2DFast(VectorRegisterInt offset, VectorRegisterInt x, VectorRegisterInt y) const
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{
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x = VectorIntAnd(x, MakeVectorRegisterInt(0xFF, 0xFF, 0xFF, 0xFF));
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y = VectorIntAnd(y, MakeVectorRegisterInt(0xFF, 0xFF, 0xFF, 0xFF));
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y = VectorIntAdd(y, offset);
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int32 xv[4];
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int32 yv[4];
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VectorIntStore(x, xv);
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VectorIntStore(y, yv);
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float Result[4];
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Result[0] = VAL_LUT[Perm[xv[0] + Perm[yv[0]]]];
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Result[1] = VAL_LUT[Perm[xv[1] + Perm[yv[1]]]];
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Result[2] = VAL_LUT[Perm[xv[2] + Perm[yv[2]]]];
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Result[3] = VAL_LUT[Perm[xv[3] + Perm[yv[3]]]];
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return VectorLoad(Result);
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}
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::ValCoord2D(int32 seed, int32 x, int32 y)
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{
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int32 n = seed;
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n ^= X_PRIME * x;
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n ^= Y_PRIME * y;
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return (n * n * n * 60493) / v_flt(2147483648);
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::ValCoord3D(int32 seed, int32 x, int32 y, int32 z)
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{
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int32 n = seed;
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n ^= X_PRIME * x;
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n ^= Y_PRIME * y;
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n ^= Z_PRIME * z;
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return (n * n * n * 60493) / v_flt(2147483648);
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}
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FN_FORCEINLINE_MATH v_flt FVoxelFastNoiseLUT::ValCoord4D(int32 seed, int32 x, int32 y, int32 z, int32 w)
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{
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int32 n = seed;
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n ^= X_PRIME * x;
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n ^= Y_PRIME * y;
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n ^= Z_PRIME * z;
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n ^= W_PRIME * w;
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return (n * n * n * 60493) / v_flt(2147483648);
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}
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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FN_FORCEINLINE_MATH VectorRegister FVoxelFastNoiseLUT::ValCoord2D(VectorRegisterInt seed, VectorRegisterInt x, VectorRegisterInt y)
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{
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VectorRegisterInt hash = seed;
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// Note: can be removed
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x = VectorIntMultiply(x, MakeVectorRegisterInt(X_PRIME, X_PRIME, X_PRIME, X_PRIME));
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y = VectorIntMultiply(y, MakeVectorRegisterInt(Y_PRIME, Y_PRIME, Y_PRIME, Y_PRIME));
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hash = VectorIntXor(x, hash);
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hash = VectorIntXor(y, hash);
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hash = VectorIntMultiply(VectorIntMultiply(VectorIntMultiply(hash, hash), MakeVectorRegisterInt(60493, 60493, 60493, 60493)), hash);
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return VectorMultiply(MakeVectorRegister(1.f / 2147483648.f, 1.f / 2147483648.f, 1.f / 2147483648.f, 1.f / 2147483648.f), VectorIntToFloat(hash));
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}
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