35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
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import FluidGridData;
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struct Params
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{
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// read-only
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FluidGridData<float> velocityX;
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// read-only
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FluidGridData<float> velocityY;
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// read-only
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FluidGridData<float> velocityZ;
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// read-write
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FluidGridData<float> divergence;
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// read-write
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FluidGridData<float> pressure;
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};
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ParameterBlock<Params> params;
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[shader("compute")]
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[numthreads(32, 8, 1)]
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void computeDivergence(uint3 dispatchThreadID : SV_DispatchThreadID)
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{
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FluidGridData<float> velocityX = params.velocityX;
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FluidGridData<float> velocityY = params.velocityY;
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FluidGridData<float> velocityZ = params.velocityZ;
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FluidGridData<float> divergence = params.divergence;
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FluidGridData<float> pressure = params.pressure;
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int x = dispatchThreadID.x + 1;
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int y = dispatchThreadID.y + 1;
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int z = dispatchThreadID.z + 1;
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if(x >= gridSize.x - 1 || y >= gridSize.y - 1 || z >= gridSize.z - 1) return;
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divergence[x, y, z] = -0.5f * (velocityX[x + 1, y, z] - velocityX[x - 1, y, z] + velocityY[x, y + 1, z] - velocityY[x, y - 1, z] + velocityZ[x, y, z + 1] - velocityZ[x, y, z - 1]) / gridSize.x;
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pressure[x, y, z] = 0;
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}
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