547 lines
13 KiB
C++
547 lines
13 KiB
C++
/*******************************************************************************
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Copyright (c) 2005-2009 David Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#include "OpenGLWidget.h"
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#include "MaterialDensityPair.h"
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#include "CubicSurfaceExtractorWithNormals.h"
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#include "SurfaceMesh.h"
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#include "Volume.h"
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#include <QApplication>
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//Use the PolyVox namespace
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using namespace PolyVox;
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#include <stdlib.h>
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#define SAMPLE_SIZE 1024
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class Perlin
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{
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public:
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Perlin(int octaves,float freq,float amp,int seed);
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float Get(float x,float y)
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{
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float vec[2];
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vec[0] = x;
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vec[1] = y;
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return perlin_noise_2D(vec);
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};
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float Get3D(float x,float y,float z)
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{
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float vec[3];
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vec[0] = x;
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vec[1] = y;
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vec[2] = z;
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return perlin_noise_3D(vec);
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};
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private:
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void init_perlin(int n,float p);
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float perlin_noise_2D(float vec[2]);
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float perlin_noise_3D(float vec[3]);
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float noise1(float arg);
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float noise2(float vec[2]);
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float noise3(float vec[3]);
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void normalize2(float v[2]);
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void normalize3(float v[3]);
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void init(void);
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int mOctaves;
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float mFrequency;
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float mAmplitude;
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int mSeed;
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int p[SAMPLE_SIZE + SAMPLE_SIZE + 2];
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float g3[SAMPLE_SIZE + SAMPLE_SIZE + 2][3];
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float g2[SAMPLE_SIZE + SAMPLE_SIZE + 2][2];
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float g1[SAMPLE_SIZE + SAMPLE_SIZE + 2];
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bool mStart;
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};
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#define B SAMPLE_SIZE
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#define BM (SAMPLE_SIZE-1)
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#define N 0x1000
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#define NP 12 /* 2^N */
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#define NM 0xfff
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#define s_curve(t) ( t * t * (3.0f - 2.0f * t) )
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#define lerp(t, a, b) ( a + t * (b - a) )
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#define setup(i,b0,b1,r0,r1)\
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t = vec[i] + N;\
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b0 = ((int)t) & BM;\
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b1 = (b0+1) & BM;\
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r0 = t - (int)t;\
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r1 = r0 - 1.0f;
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float Perlin::noise1(float arg)
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{
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int bx0, bx1;
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float rx0, rx1, sx, t, u, v, vec[1];
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vec[0] = arg;
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if (mStart)
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{
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srand(mSeed);
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mStart = false;
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init();
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}
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setup(0, bx0,bx1, rx0,rx1);
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sx = s_curve(rx0);
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u = rx0 * g1[ p[ bx0 ] ];
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v = rx1 * g1[ p[ bx1 ] ];
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return lerp(sx, u, v);
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}
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float Perlin::noise2(float vec[2])
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{
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int bx0, bx1, by0, by1, b00, b10, b01, b11;
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float rx0, rx1, ry0, ry1, *q, sx, sy, a, b, t, u, v;
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int i, j;
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if (mStart)
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{
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srand(mSeed);
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mStart = false;
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init();
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}
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setup(0,bx0,bx1,rx0,rx1);
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setup(1,by0,by1,ry0,ry1);
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i = p[bx0];
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j = p[bx1];
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b00 = p[i + by0];
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b10 = p[j + by0];
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b01 = p[i + by1];
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b11 = p[j + by1];
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sx = s_curve(rx0);
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sy = s_curve(ry0);
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#define at2(rx,ry) ( rx * q[0] + ry * q[1] )
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q = g2[b00];
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u = at2(rx0,ry0);
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q = g2[b10];
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v = at2(rx1,ry0);
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a = lerp(sx, u, v);
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q = g2[b01];
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u = at2(rx0,ry1);
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q = g2[b11];
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v = at2(rx1,ry1);
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b = lerp(sx, u, v);
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return lerp(sy, a, b);
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}
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float Perlin::noise3(float vec[3])
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{
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int bx0, bx1, by0, by1, bz0, bz1, b00, b10, b01, b11;
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float rx0, rx1, ry0, ry1, rz0, rz1, *q, sy, sz, a, b, c, d, t, u, v;
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int i, j;
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if (mStart)
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{
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srand(mSeed);
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mStart = false;
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init();
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}
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setup(0, bx0,bx1, rx0,rx1);
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setup(1, by0,by1, ry0,ry1);
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setup(2, bz0,bz1, rz0,rz1);
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i = p[ bx0 ];
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j = p[ bx1 ];
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b00 = p[ i + by0 ];
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b10 = p[ j + by0 ];
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b01 = p[ i + by1 ];
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b11 = p[ j + by1 ];
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t = s_curve(rx0);
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sy = s_curve(ry0);
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sz = s_curve(rz0);
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#define at3(rx,ry,rz) ( rx * q[0] + ry * q[1] + rz * q[2] )
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q = g3[ b00 + bz0 ] ; u = at3(rx0,ry0,rz0);
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q = g3[ b10 + bz0 ] ; v = at3(rx1,ry0,rz0);
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a = lerp(t, u, v);
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q = g3[ b01 + bz0 ] ; u = at3(rx0,ry1,rz0);
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q = g3[ b11 + bz0 ] ; v = at3(rx1,ry1,rz0);
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b = lerp(t, u, v);
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c = lerp(sy, a, b);
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q = g3[ b00 + bz1 ] ; u = at3(rx0,ry0,rz1);
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q = g3[ b10 + bz1 ] ; v = at3(rx1,ry0,rz1);
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a = lerp(t, u, v);
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q = g3[ b01 + bz1 ] ; u = at3(rx0,ry1,rz1);
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q = g3[ b11 + bz1 ] ; v = at3(rx1,ry1,rz1);
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b = lerp(t, u, v);
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d = lerp(sy, a, b);
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return lerp(sz, c, d);
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}
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void Perlin::normalize2(float v[2])
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{
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float s;
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s = (float)sqrt(v[0] * v[0] + v[1] * v[1]);
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s = 1.0f/s;
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v[0] = v[0] * s;
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v[1] = v[1] * s;
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}
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void Perlin::normalize3(float v[3])
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{
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float s;
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s = (float)sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
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s = 1.0f/s;
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v[0] = v[0] * s;
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v[1] = v[1] * s;
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v[2] = v[2] * s;
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}
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void Perlin::init(void)
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{
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int i, j, k;
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for (i = 0 ; i < B ; i++)
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{
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p[i] = i;
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g1[i] = (float)((rand() % (B + B)) - B) / B;
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for (j = 0 ; j < 2 ; j++)
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g2[i][j] = (float)((rand() % (B + B)) - B) / B;
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normalize2(g2[i]);
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for (j = 0 ; j < 3 ; j++)
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g3[i][j] = (float)((rand() % (B + B)) - B) / B;
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normalize3(g3[i]);
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}
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while (--i)
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{
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k = p[i];
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p[i] = p[j = rand() % B];
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p[j] = k;
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}
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for (i = 0 ; i < B + 2 ; i++)
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{
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p[B + i] = p[i];
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g1[B + i] = g1[i];
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for (j = 0 ; j < 2 ; j++)
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g2[B + i][j] = g2[i][j];
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for (j = 0 ; j < 3 ; j++)
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g3[B + i][j] = g3[i][j];
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}
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}
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float Perlin::perlin_noise_2D(float vec[2])
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{
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int terms = mOctaves;
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float freq = mFrequency;
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float result = 0.0f;
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float amp = mAmplitude;
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vec[0]*=mFrequency;
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vec[1]*=mFrequency;
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for( int i=0; i<terms; i++ )
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{
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result += noise2(vec)*amp;
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vec[0] *= 2.0f;
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vec[1] *= 2.0f;
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amp*=0.5f;
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}
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return result;
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}
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float Perlin::perlin_noise_3D(float vec[3])
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{
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int terms = mOctaves;
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float freq = mFrequency;
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float result = 0.0f;
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float amp = mAmplitude;
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vec[0]*=mFrequency;
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vec[1]*=mFrequency;
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vec[2]*=mFrequency;
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for( int i=0; i<terms; i++ )
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{
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result += noise3(vec)*amp;
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vec[0] *= 2.0f;
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vec[1] *= 2.0f;
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vec[2] *= 2.0f;
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amp*=0.5f;
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}
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return result;
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}
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Perlin::Perlin(int octaves,float freq,float amp,int seed)
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{
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mOctaves = octaves;
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mFrequency = freq;
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mAmplitude = amp;
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mSeed = seed;
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mStart = true;
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}
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void createPerlinVolumeSlow(Volume<MaterialDensityPair44>& volData)
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{
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Perlin perlin(2,8,1,234);
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for(int z = 1; z < volData.getDepth()-1; z++)
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{
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std::cout << z << std::endl;
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for(int y = 1; y < volData.getHeight()-1; y++)
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{
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for(int x = 1; x < volData.getWidth()-1; x++)
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{
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float perlinVal = perlin.Get3D(x /static_cast<float>(volData.getWidth()-1), (y) / static_cast<float>(volData.getHeight()-1), z / static_cast<float>(volData.getDepth()-1));
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perlinVal += 1.0f;
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perlinVal *= 0.5f;
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perlinVal *= MaterialDensityPair44::getMaxDensity();
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MaterialDensityPair44 voxel;
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voxel.setMaterial(245);
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voxel.setDensity(perlinVal);
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/*if(perlinVal < 0.0f)
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{
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voxel.setMaterial(245);
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voxel.setDensity(MaterialDensityPair44::getMaxDensity());
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}
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else
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{
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voxel.setMaterial(0);
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voxel.setDensity(MaterialDensityPair44::getMinDensity());
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}*/
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volData.setVoxelAt(x, y, z, voxel);
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}
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}
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}
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}
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/*void createPerlinVolumeFast(Volume<MaterialDensityPair44>& volData)
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{
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Perlin perlin(2,8,1,234);
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for(int blockZ = 0; blockZ < volData.m_uDepthInBlocks; blockZ++)
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{
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std::cout << blockZ << std::endl;
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for(int blockY = 0; blockY < volData.m_uHeightInBlocks; blockY++)
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{
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for(int blockX = 0; blockX < volData.m_uWidthInBlocks; blockX++)
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{
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for(int offsetz = 0; offsetz < volData.m_uBlockSideLength; offsetz++)
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{
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for(int offsety = 0; offsety < volData.m_uBlockSideLength; offsety++)
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{
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for(int offsetx = 0; offsetx < volData.m_uBlockSideLength; offsetx++)
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{
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int x = blockX * volData.m_uBlockSideLength + offsetx;
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int y = blockY * volData.m_uBlockSideLength + offsety;
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int z = blockZ * volData.m_uBlockSideLength + offsetz;
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if((x == 0) || (x == volData.getWidth()-1)) continue;
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if((y == 0) || (y == volData.getHeight()-1)) continue;
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if((z == 0) || (z == volData.getDepth()-1)) continue;
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float perlinVal = perlin.Get3D(x /static_cast<float>(volData.getWidth()-1), (y) / static_cast<float>(volData.getHeight()-1), z / static_cast<float>(volData.getDepth()-1));
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MaterialDensityPair44 voxel;
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if(perlinVal < 0.0f)
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{
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voxel.setMaterial(245);
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voxel.setDensity(MaterialDensityPair44::getMaxDensity());
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}
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else
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{
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voxel.setMaterial(0);
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voxel.setDensity(MaterialDensityPair44::getMinDensity());
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}
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volData.setVoxelAt(x, y, z, voxel);
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}
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}
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}
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}
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}
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}
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}*/
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void createPerlinTerrain(Volume<MaterialDensityPair44>& volData)
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{
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Perlin perlin(2,2,1,234);
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for(int x = 1; x < volData.getWidth()-1; x++)
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{
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std::cout << x << std::endl;
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for(int y = 1; y < volData.getHeight()-1; y++)
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{
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float perlinVal = perlin.Get(x / static_cast<float>(volData.getHeight()-1), y / static_cast<float>(volData.getDepth()-1));
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perlinVal += 1.0f;
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perlinVal *= 0.5f;
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perlinVal *= volData.getWidth();
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for(int z = 1; z < volData.getDepth()-1; z++)
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{
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MaterialDensityPair44 voxel;
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if(z < perlinVal)
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{
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voxel.setMaterial(245);
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voxel.setDensity(MaterialDensityPair44::getMaxDensity());
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}
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else
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{
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voxel.setMaterial(0);
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voxel.setDensity(MaterialDensityPair44::getMinDensity());
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}
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volData.setVoxelAt(x, y, z, voxel);
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}
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}
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}
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}
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void createSphereInVolume(Volume<MaterialDensityPair44>& volData, Vector3DFloat v3dVolCenter, float fRadius)
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{
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//This vector hold the position of the center of the volume
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//Vector3DFloat v3dVolCenter(volData.getWidth() / 2, volData.getHeight() / 2, volData.getDepth() / 2);
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int iRadius = fRadius;
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//This three-level for loop iterates over every voxel in the volume
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for (int z = v3dVolCenter.getZ() - iRadius; z <= v3dVolCenter.getZ() + iRadius; z++)
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{
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for (int y = v3dVolCenter.getY() - iRadius; y <= v3dVolCenter.getY() + iRadius; y++)
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{
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for (int x = v3dVolCenter.getX() - iRadius; x <= v3dVolCenter.getX() + iRadius; x++)
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{
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//Store our current position as a vector...
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Vector3DFloat v3dCurrentPos(x,y,z);
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//And compute how far the current position is from the center of the volume
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float fDistToCenter = (v3dCurrentPos - v3dVolCenter).length();
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//If the current voxel is less than 'radius' units from the center then we make it solid.
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if(fDistToCenter <= fRadius)
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{
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//Our new density value
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uint8_t uDensity = MaterialDensityPair44::getMaxDensity();
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//Get the old voxel
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MaterialDensityPair44 voxel = volData.getVoxelAt(x,y,z);
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//Modify the density
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voxel.setDensity(uDensity);
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//Wrte the voxel value into the volume
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volData.setVoxelAt(x, y, z, voxel);
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}
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}
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}
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}
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}
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int main(int argc, char *argv[])
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{
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//Create and show the Qt OpenGL window
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QApplication app(argc, argv);
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OpenGLWidget openGLWidget(0);
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openGLWidget.show();
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//Create an empty volume and then place a sphere in it
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Volume<MaterialDensityPair44> volData(256, 256, 256);
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volData.useCompatibilityMode();
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//createSphereInVolume(volData, 30);
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createPerlinTerrain(volData);
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//createPerlinVolumeSlow(volData);
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std::cout << "Memory usage: " << volData.calculateSizeInBytes() << std::endl;
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//volData.setBlockCacheSize(8);
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std::cout << "Memory usage: " << volData.calculateSizeInBytes() << std::endl;
|
|
std::cout << "Compression ratio: " << volData.calculateCompressionRatio() << std::endl;
|
|
|
|
/*srand(12345);
|
|
for(int ct = 0; ct < 1000; ct++)
|
|
{
|
|
std::cout << ct << std::endl;
|
|
int x = rand() % volData.getWidth();
|
|
int y = rand() % volData.getHeight();
|
|
int z = rand() % volData.getDepth();
|
|
|
|
int r = rand() % 20;
|
|
|
|
createSphereInVolume(volData, Vector3DFloat(x,y,z), r);
|
|
}*/
|
|
|
|
//Extract the surface
|
|
SurfaceMesh<PositionMaterialNormal> mesh;
|
|
CubicSurfaceExtractorWithNormals<MaterialDensityPair44> surfaceExtractor(&volData, volData.getEnclosingRegion(), &mesh);
|
|
surfaceExtractor.execute();
|
|
|
|
//Pass the surface to the OpenGL window
|
|
openGLWidget.setSurfaceMeshToRender(mesh);
|
|
|
|
//Run the message pump.
|
|
return app.exec();
|
|
}
|