74 lines
2.0 KiB
Plaintext
74 lines
2.0 KiB
Plaintext
// Crest Water System
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// Copyright © 2024 Wave Harmonic. All rights reserved.
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// Adds flow from a provided texture. Used by Painted and Texture input modes.
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#pragma exclude_renderers glcore gles3
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#pragma kernel CrestExecute
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#include "HLSLSupport.cginc"
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#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Macros.hlsl"
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#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Constants.hlsl"
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#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Globals.hlsl"
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#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Helpers.hlsl"
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#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/InputsDriven.hlsl"
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#include "Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Cascade.hlsl"
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Texture2D _Crest_Texture;
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RWTexture2DArray<m_Float2> _Crest_Target;
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CBUFFER_START(CrestPerMaterial)
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int _Crest_Blend;
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float _Crest_Weight;
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float2 _Crest_Multiplier;
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float2 _Crest_TextureSize;
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float2 _Crest_TexturePosition;
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float2 _Crest_TextureRotation;
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float _Crest_FeatherWidth;
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bool _Crest_NegativeValues;
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CBUFFER_END
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m_CrestNameSpace
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void Execute(uint3 id)
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{
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const Cascade cascade = Cascade::MakeFlow(id.z);
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const float2 uv = DataIDToInputUV(id.xy, cascade, _Crest_TexturePosition, _Crest_TextureRotation, _Crest_TextureSize);
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half weight = _Crest_Weight;
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// Feather boundaries.
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weight *= FeatherWeightFromUV(uv, _Crest_FeatherWidth);
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// Check we are within bounds.
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if (weight <= 0.0)
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{
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return;
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}
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float2 source = _Crest_Texture.SampleLevel(LODData_linear_clamp_sampler, uv, 0).xy;
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if (!_Crest_NegativeValues)
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{
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// From 0..1 to -1..1.
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source = source * 2.0 - 1.0;
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}
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source *= _Crest_Multiplier;
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if (_Crest_Blend == m_CrestBlendAlpha)
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{
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weight *= saturate(length(source));
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}
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const float2 target = _Crest_Target[id];
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const float2 result = Blend(_Crest_Blend, weight, 1.0, source, target);
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_Crest_Target[id] = m_Float2FromFloat2(result);
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}
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m_CrestNameSpaceEnd
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m_CrestInputKernelDefault(Execute)
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