35 lines
1.0 KiB
HLSL
35 lines
1.0 KiB
HLSL
#ifndef FLUIDUTILSSG_INCLUDED
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#define FLUIDUTILSSG_INCLUDED
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float4 _TileData[17];
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// Convert from tile coords to uv coords.
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void TileToUV_float(in float2 uv, in int index, out float2 coords)
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{
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float4 tile = _TileData[index];
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coords = tile.xy + uv * tile.zw;
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}
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// flowmap lookup, wrapping and clamping defined by sampler.
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void AdvectTexture_float(in Texture2D tex, in SamplerState sm, in float2 uv, in float2 velocity, in float speedScale, in float offset, out float4 color)
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{
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velocity *= speedScale;
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float phase1 = frac(_Time.y);
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float phase2 = frac(_Time.y + 0.5);
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float2 flowUV1 = uv - velocity * (phase1 + offset);
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float2 flowUV2 = uv - velocity * (phase2 + offset);
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flowUV1 += (_Time.y - phase1) * 0.25;
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flowUV2 += (_Time.y - phase2) * 0.25 + 0.5;
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float4 color1 = tex.Sample(sm, flowUV1);
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float4 color2 = tex.Sample(sm, flowUV2);
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color1 *= 0.5*(1 + cos(6.2832 * (phase1+0.5)));
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color2 *= 0.5*(1 + cos(6.2832 * (phase2+0.5)));
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color = color1 + color2;
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}
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#endif |