44 lines
1.1 KiB
HLSL
44 lines
1.1 KiB
HLSL
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//Functionality to sample the water's displacement pre-pass buffer
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uniform bool _WaterDisplacementPrePassAvailable;
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uniform float3 _WaterDisplacementCoords;
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//XY: Bounds min
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//Z: Bounds size
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uniform Texture2D _WaterDisplacementBuffer;
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#ifndef UNITY_CORE_SAMPLERS_INCLUDED
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SamplerState sampler_LinearClamp;
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#endif
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//Position, relative to rendering bounds (normalized 0-1)
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float2 WorldToDisplacementUV(float3 positionWS)
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{
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return (positionWS.xz - _WaterDisplacementCoords.xy) / _WaterDisplacementCoords.z;
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}
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float SampleDisplacementBuffer(float2 uv)
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{
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if(_WaterDisplacementPrePassAvailable == false) return 0;
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const float height = _WaterDisplacementBuffer.SampleLevel(sampler_LinearClamp, uv, 0).r;
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//Need to figure out how to determine if a void is hit
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//if(height == 0.0f) return -1000;
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return height;
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}
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//Main function
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float SampleWaterHeight(float3 positionWS)
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{
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return SampleDisplacementBuffer(WorldToDisplacementUV(positionWS));
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}
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//Shader Graph
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void SampleWaterHeight_float(float3 positionWS, out float height)
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{
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#if defined(SHADERGRAPH_PREVIEW)
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height = 0;
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#else
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height = SampleWaterHeight(positionWS);
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#endif
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}
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