32 lines
1.1 KiB
HLSL
32 lines
1.1 KiB
HLSL
#include "fluid_common.hlsli"
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//////////////////////////////////////////////////////////////////////////////////////////
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// Pixel
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float4 main(p_fluidsim input) : SV_Target
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{
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if (IsNonEmptyCell(input.texcoords.xyz))
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{
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return 0;
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}
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float3 npos = GetAdvectedPosTexCoords(input);
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float4 r;
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float3 diff = abs(floatVolumeDim.xyz - input.cell0.xyz);
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// Must use regular semi-Lagrangian advection instead of BFECC at the volume boundaries
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if ((diff.x > (floatVolumeDim.x - 4)) || (diff.y > (floatVolumeDim.y - 4)) || (diff.z > (floatVolumeDim.z - 4)))
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{
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r = Texture_color.SampleLevel(samLinear, npos, 0);
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}
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else
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{
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// Texture_color contains \phi^n; Texture_tempscalar contains \bar{\phi}
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// (i.e.: the result of 1 forward advection step, followed by a backwards advection step)
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r = 1.5f * Texture_color.SampleLevel(samLinear, npos, 0) -
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0.5f * Texture_tempscalar.SampleLevel(samLinear, npos, 0);
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}
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r = saturate(r);
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return r * modulate;
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}
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