616f68bf8b
Added ability to hold shift and skip the terrain generation when loading Added ability for the perlin terrain to save a raw image of the terrain to use as a cache
68 lines
3.4 KiB
C++
68 lines
3.4 KiB
C++
#pragma once
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#include "DirectXFramework.h"
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#include <vector>
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#include <numeric>
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#include <random>
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#include <fstream>
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#include "SharedMethods.h"
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#include "TerrainNode.h"
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// Class for generating a terrain using a perlin noise algorithm, this now caches the result too so it only has to run on the initial time its loaded.
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class PerlinTerrainNode : public TerrainNode
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{
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public:
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PerlinTerrainNode(wstring name, wstring seed, float chunkSize, int widthX = 1023, int widthZ = 1023, float waterHeight = 300.0f, int cellSizeX = 10, int cellSizeZ = 10);
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private:
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// the static perlin permutation array, we could calculate a random one but apparently you can run into sequencing issues and this just seems like the best solution
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vector<unsigned char> _staticP = { 151,160,137,91,90,15,
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131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
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190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
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88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
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77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
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102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
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135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
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5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
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223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
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129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
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251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
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49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
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138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180,
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151,160,137,91,90,15,
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131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
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190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
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88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
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77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
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102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
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135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
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5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
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223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
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129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
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251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
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49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
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138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
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};
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// Vector to hold the actual randomised perlin noise permutation array
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vector<unsigned char> _p;
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// The chunk size lets us control how large a noise spot should be, lower numbers will make things flatter, larger numbers will make things spikey
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float _chunkSize;
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// Methods for Caching the output to a raw image format, and reading it back in the next time its loaded
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bool ReadCache();
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void CacheOutput();
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// Methods for fading a number, used for the noise calculation
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float Fade(float t);
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// Method for generating a perlin gradient.
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float Grad(int hash, float x, float y);
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void GeneratePerlinValues();
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bool GeneratePerlinHeights();
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float GetPerlinValueAt(float x, float y, int octaves, float persistance);
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float GetNoiseValueAt(float x, float y);
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};
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