277 lines
9.5 KiB
C++
277 lines
9.5 KiB
C++
// Copyright (C) 2016 Rémi Bèges
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// This file is part of the "Nazara Engine - Noise module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Noise/Perlin.hpp>
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#include <Nazara/Noise/NoiseTools.hpp>
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#include <exception>
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#include <stdexcept>
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#include <Nazara/Noise/Debug.hpp>
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namespace Nz
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{
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Perlin::Perlin(unsigned int seed) :
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Perlin()
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{
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SetSeed(seed);
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Shuffle();
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}
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float Perlin::Get(float x, float y, float scale) const
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{
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float xc, yc;
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int x0, y0;
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int gi0,gi1,gi2,gi3;
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int ii, jj;
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float s,t,u,v;
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float Cx,Cy;
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float Li1, Li2;
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float tempx,tempy;
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xc = x * scale;
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yc = y * scale;
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x0 = fastfloor(xc);
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y0 = fastfloor(yc);
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ii = x0 & 255;
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jj = y0 & 255;
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gi0 = m_permutations[ii + m_permutations[jj]] & 7;
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gi1 = m_permutations[ii + 1 + m_permutations[jj]] & 7;
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gi2 = m_permutations[ii + m_permutations[jj + 1]] & 7;
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gi3 = m_permutations[ii + 1 + m_permutations[jj + 1]] & 7;
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tempx = xc - x0;
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tempy = yc - y0;
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Cx = tempx * tempx * tempx * (tempx * (tempx * 6 - 15) + 10);
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Cy = tempy * tempy * tempy * (tempy * (tempy * 6 - 15) + 10);
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s = s_gradients2[gi0][0]*tempx + s_gradients2[gi0][1]*tempy;
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tempx = xc - (x0 + 1);
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t = s_gradients2[gi1][0]*tempx + s_gradients2[gi1][1]*tempy;
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tempy = yc - (y0 + 1);
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v = s_gradients2[gi3][0]*tempx + s_gradients2[gi3][1]*tempy;
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tempx = xc - x0;
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u = s_gradients2[gi2][0]*tempx + s_gradients2[gi2][1]*tempy;
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Li1 = s + Cx*(t-s);
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Li2 = u + Cx*(v-u);
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return Li1 + Cy*(Li2-Li1);
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}
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float Perlin::Get(float x, float y, float z, float scale) const
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{
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float xc, yc, zc;
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int x0, y0, z0;
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int gi0,gi1,gi2,gi3,gi4,gi5,gi6,gi7;
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int ii, jj, kk;
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float Li1,Li2,Li3,Li4,Li5,Li6;
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float s[2],t[2],u[2],v[2];
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float Cx,Cy,Cz;
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float tempx,tempy,tempz;
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xc = x * scale;
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yc = y * scale;
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zc = z * scale;
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x0 = fastfloor(xc);
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y0 = fastfloor(yc);
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z0 = fastfloor(zc);
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ii = x0 & 255;
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jj = y0 & 255;
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kk = z0 & 255;
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gi0 = m_permutations[ii + m_permutations[jj + m_permutations[kk]]] & 15;
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gi1 = m_permutations[ii + 1 + m_permutations[jj + m_permutations[kk]]] & 15;
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gi2 = m_permutations[ii + m_permutations[jj + 1 + m_permutations[kk]]] & 15;
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gi3 = m_permutations[ii + 1 + m_permutations[jj + 1 + m_permutations[kk]]] & 15;
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gi4 = m_permutations[ii + m_permutations[jj + m_permutations[kk + 1]]] & 15;
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gi5 = m_permutations[ii + 1 + m_permutations[jj + m_permutations[kk + 1]]] & 15;
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gi6 = m_permutations[ii + m_permutations[jj + 1 + m_permutations[kk + 1]]] & 15;
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gi7 = m_permutations[ii + 1 + m_permutations[jj + 1 + m_permutations[kk + 1]]] & 15;
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tempx = xc - x0;
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tempy = yc - y0;
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tempz = zc - z0;
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Cx = tempx * tempx * tempx * (tempx * (tempx * 6 - 15) + 10);
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Cy = tempy * tempy * tempy * (tempy * (tempy * 6 - 15) + 10);
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Cz = tempz * tempz * tempz * (tempz * (tempz * 6 - 15) + 10);
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s[0] = s_gradients3[gi0][0]*tempx + s_gradients3[gi0][1]*tempy + s_gradients3[gi0][2]*tempz;
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tempx = xc - (x0 + 1);
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t[0] = s_gradients3[gi1][0]*tempx + s_gradients3[gi1][1]*tempy + s_gradients3[gi1][2]*tempz;
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tempy = yc - (y0 + 1);
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v[0] = s_gradients3[gi3][0]*tempx + s_gradients3[gi3][1]*tempy + s_gradients3[gi3][2]*tempz;
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tempx = xc - x0;
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u[0] = s_gradients3[gi2][0]*tempx + s_gradients3[gi2][1]*tempy + s_gradients3[gi2][2]*tempz;
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tempy = yc - y0;
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tempz = zc - (z0 + 1);
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s[1] = s_gradients3[gi4][0]*tempx + s_gradients3[gi4][1]*tempy + s_gradients3[gi4][2]*tempz;
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tempx = xc - (x0 + 1);
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t[1] = s_gradients3[gi5][0]*tempx + s_gradients3[gi5][1]*tempy + s_gradients3[gi5][2]*tempz;
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tempy = yc - (y0 + 1);
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v[1] = s_gradients3[gi7][0]*tempx + s_gradients3[gi7][1]*tempy + s_gradients3[gi7][2]*tempz;
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tempx = xc - x0;
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u[1] = s_gradients3[gi6][0]*tempx + s_gradients3[gi6][1]*tempy + s_gradients3[gi6][2]*tempz;
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Li1 = s[0] + Cx*(t[0]-s[0]);
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Li2 = u[0] + Cx*(v[0]-u[0]);
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Li3 = s[1] + Cx*(t[1]-s[1]);
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Li4 = u[1] + Cx*(v[1]-u[1]);
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Li5 = Li1 + Cy * (Li2-Li1);
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Li6 = Li3 + Cy * (Li4-Li3);
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return Li5 + Cz * (Li6-Li5);
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}
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float Perlin::Get(float x, float y, float z, float w, float scale) const
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{
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float xc,yc,zc,wc;
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int x0,y0,z0,w0;
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int gi0,gi1,gi2,gi3,gi4,gi5,gi6,gi7,gi8,gi9,gi10,gi11,gi12,gi13,gi14,gi15;
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int ii,jj,kk,ll;
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float Li1,Li2,Li3,Li4,Li5,Li6,Li7,Li8,Li9,Li10,Li11,Li12,Li13,Li14;
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float s[4],t[4],u[4],v[4];
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float Cx,Cy,Cz,Cw;
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float tempx,tempy,tempz,tempw;
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xc = x * scale;
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yc = y * scale;
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zc = z * scale;
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wc = w * scale;
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x0 = fastfloor(xc);
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y0 = fastfloor(yc);
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z0 = fastfloor(zc);
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w0 = fastfloor(wc);
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ii = x0 & 255;
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jj = y0 & 255;
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kk = z0 & 255;
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ll = w0 & 255;
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gi0 = m_permutations[ii + m_permutations[jj + m_permutations[kk + m_permutations[ll]]]] & 31;
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gi1 = m_permutations[ii + 1 + m_permutations[jj + m_permutations[kk + m_permutations[ll]]]] & 31;
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gi2 = m_permutations[ii + m_permutations[jj + 1 + m_permutations[kk + m_permutations[ll]]]] & 31;
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gi3 = m_permutations[ii + 1 + m_permutations[jj + 1 + m_permutations[kk + m_permutations[ll]]]] & 31;
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gi4 = m_permutations[ii + m_permutations[jj + + m_permutations[kk + 1 + m_permutations[ll]]]] & 31;
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gi5 = m_permutations[ii + 1 + m_permutations[jj + + m_permutations[kk + 1 + m_permutations[ll]]]] & 31;
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gi6 = m_permutations[ii + m_permutations[jj + 1 + m_permutations[kk + 1 + m_permutations[ll]]]] & 31;
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gi7 = m_permutations[ii + 1 + m_permutations[jj + 1 + m_permutations[kk + 1 + m_permutations[ll]]]] & 31;
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gi8 = m_permutations[ii + m_permutations[jj + m_permutations[kk + m_permutations[ll + 1]]]] & 31;
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gi9 = m_permutations[ii + 1 + m_permutations[jj + m_permutations[kk + m_permutations[ll + 1]]]] & 31;
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gi10 = m_permutations[ii + m_permutations[jj + 1 + m_permutations[kk + m_permutations[ll + 1]]]] & 31;
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gi11 = m_permutations[ii + 1 + m_permutations[jj + 1 + m_permutations[kk + m_permutations[ll + 1]]]] & 31;
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gi12 = m_permutations[ii + m_permutations[jj + m_permutations[kk + 1 + m_permutations[ll + 1]]]] & 31;
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gi13 = m_permutations[ii + 1 + m_permutations[jj + m_permutations[kk + 1 + m_permutations[ll + 1]]]] & 31;
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gi14 = m_permutations[ii + m_permutations[jj + 1 + m_permutations[kk + 1 + m_permutations[ll + 1]]]] & 31;
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gi15 = m_permutations[ii + 1 + m_permutations[jj + 1 + m_permutations[kk + 1 + m_permutations[ll + 1]]]] & 31;
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tempx = xc - x0;
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tempy = yc - y0;
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tempz = zc - z0;
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tempw = wc - w0;
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Cx = tempx * tempx * tempx * (tempx * (tempx * 6 - 15) + 10);
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Cy = tempy * tempy * tempy * (tempy * (tempy * 6 - 15) + 10);
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Cz = tempz * tempz * tempz * (tempz * (tempz * 6 - 15) + 10);
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Cw = tempw * tempw * tempw * (tempw * (tempw * 6 - 15) + 10);
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s[0] = s_gradients4[gi0][0]*tempx + s_gradients4[gi0][1]*tempy + s_gradients4[gi0][2]*tempz + s_gradients4[gi0][3]*tempw;
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tempx = xc - (x0+1);
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t[0] = s_gradients4[gi1][0]*tempx + s_gradients4[gi1][1]*tempy + s_gradients4[gi1][2]*tempz + s_gradients4[gi1][3]*tempw;
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tempy = yc - (y0+1);
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v[0] = s_gradients4[gi3][0]*tempx + s_gradients4[gi3][1]*tempy + s_gradients4[gi3][2]*tempz + s_gradients4[gi3][3]*tempw;
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tempx = xc - x0;
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u[0] = s_gradients4[gi2][0]*tempx + s_gradients4[gi2][1]*tempy + s_gradients4[gi2][2]*tempz + s_gradients4[gi2][3]*tempw;
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tempy = yc - y0;
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tempz = zc - (z0+1);
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s[1] = s_gradients4[gi4][0]*tempx + s_gradients4[gi4][1]*tempy + s_gradients4[gi4][2]*tempz + s_gradients4[gi4][3]*tempw;
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tempx = xc - (x0+1);
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t[1] = s_gradients4[gi5][0]*tempx + s_gradients4[gi5][1]*tempy + s_gradients4[gi5][2]*tempz + s_gradients4[gi5][3]*tempw;
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tempy = yc - (y0+1);
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v[1] = s_gradients4[gi7][0]*tempx + s_gradients4[gi7][1]*tempy + s_gradients4[gi7][2]*tempz + s_gradients4[gi7][3]*tempw;
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tempx = xc - x0;
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u[1] = s_gradients4[gi6][0]*tempx + s_gradients4[gi6][1]*tempy + s_gradients4[gi6][2]*tempz + s_gradients4[gi6][3]*tempw;
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tempy = yc - y0;
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tempz = zc - z0;
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tempw = wc - (w0+1);
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s[2] = s_gradients4[gi8][0]*tempx + s_gradients4[gi8][1]*tempy + s_gradients4[gi8][2]*tempz + s_gradients4[gi8][3]*tempw;
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tempx = xc - (x0+1);
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t[2] = s_gradients4[gi9][0]*tempx + s_gradients4[gi9][1]*tempy + s_gradients4[gi9][2]*tempz + s_gradients4[gi9][3]*tempw;
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tempy = yc - (y0+1);
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v[2] = s_gradients4[gi11][0]*tempx + s_gradients4[gi11][1]*tempy + s_gradients4[gi11][2]*tempz + s_gradients4[gi11][3]*tempw;
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tempx = xc - x0;
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u[2] = s_gradients4[gi10][0]*tempx + s_gradients4[gi10][1]*tempy + s_gradients4[gi10][2]*tempz + s_gradients4[gi10][3]*tempw;
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tempy = yc - y0;
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tempz = zc - (z0+1);
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s[3] = s_gradients4[gi12][0]*tempx + s_gradients4[gi12][1]*tempy + s_gradients4[gi12][2]*tempz + s_gradients4[gi12][3]*tempw;
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tempx = xc - (x0+1);
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t[3] = s_gradients4[gi13][0]*tempx + s_gradients4[gi13][1]*tempy + s_gradients4[gi13][2]*tempz + s_gradients4[gi13][3]*tempw;
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tempy = yc - (y0+1);
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v[3] = s_gradients4[gi15][0]*tempx + s_gradients4[gi15][1]*tempy + s_gradients4[gi15][2]*tempz + s_gradients4[gi15][3]*tempw;
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tempx = xc - x0;
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u[3] = s_gradients4[gi14][0]*tempx + s_gradients4[gi14][1]*tempy + s_gradients4[gi14][2]*tempz + s_gradients4[gi14][3]*tempw;
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Li1 = s[0] + Cx*(t[0]-s[0]);
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Li2 = u[0] + Cx*(v[0]-u[0]);
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Li3 = s[1] + Cx*(t[1]-s[1]);
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Li4 = u[1] + Cx*(v[1]-u[1]);
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Li5 = s[2] + Cx*(t[2]-s[2]);
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Li6 = u[2] + Cx*(v[2]-u[2]);
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Li7 = s[3] + Cx*(t[3]-s[3]);
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Li8 = u[3] + Cx*(v[3]-u[3]);
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Li9 = Li1 + Cy*(Li2-Li1);
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Li10 = Li3 + Cy*(Li4-Li3);
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Li11 = Li5 + Cy*(Li6-Li5);
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Li12 = Li7 + Cy*(Li8-Li7);
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Li13 = Li9 + Cz*(Li10-Li9);
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Li14 = Li11 + Cz*(Li12-Li11);
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return Li13 + Cw*(Li14-Li13);
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}
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}
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