59 lines
1.6 KiB
Plaintext
59 lines
1.6 KiB
Plaintext
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// Each #kernel tells which function to compile; you can have many kernels
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#pragma kernel CSMain
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// Create a RenderTexture with enableRandomWrite flag and set it
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// with cs.SetTexture
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RWStructuredBuffer<float> oldVegetation;
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RWStructuredBuffer<float> vegetation;
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RWStructuredBuffer<float> oldWater;
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RWStructuredBuffer<float> water;
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RWStructuredBuffer<float> feedModifier;
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RWStructuredBuffer<float> killModifier;
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int sizeX;
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int sizeY;
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float DWater;
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float DVegetation;
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float feedRate;
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float killRate;
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float dT;
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int index(int x, int y)
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{
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return x + sizeX * y;
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}
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float get(RWStructuredBuffer<float> array, int x, int y)
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{
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int idx = index(x, y);
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if (idx < 0 || idx >= sizeX * sizeY)
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{
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return 0;
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}
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return array[idx];
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}
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float laplace(RWStructuredBuffer<float> array, int x, int y)
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{
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return 0.2 * (get(array, x + 1, y) + get(array, x - 1, y) + get(array, x, y + 1) + get(array, x, y - 1))
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+ 0.05 * (get(array, x + 1, y + 1) + get(array, x + 1, y - 1) + get(array, x - 1, y + 1) + get(array, x - 1, y - 1))
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- get(array, x, y);
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}
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[numthreads(8,8,1)]
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void CSMain (uint3 id : SV_DispatchThreadID)
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{
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int x = id.x;
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int y = id.y;
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float w = oldWater[index(x, y)];
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float r = oldVegetation[index(x, y)];
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float feed = feedRate * feedModifier[index(x, y)];
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float kill = killRate * killModifier[index(x, y)];
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water[index(x, y)] = clamp(w + dT * DWater * laplace(oldWater, x, y) - w * w * r * r + feed, 1, 0);
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vegetation[index(x, y)] = clamp(r + dT * (DVegetation * laplace(oldVegetation, x, y) + r * (w * r - kill)), 1, 0);
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}
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