91 lines
3.2 KiB
HLSL
91 lines
3.2 KiB
HLSL
//-----------------------------------------------------------------------------
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// Copyright(C) Yan Verde - All Rights Reserved
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// Copyright protected under Unity Asset Store EULA
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// Refer to https://unity3d.com/legal/as_terms for more informations
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// -----------------------------------------------------------------------------
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// URP Water
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// Author : Yan Verde
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// Date : April 10, 2021
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// -----------------------------------------------------------------------------
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#ifndef URPWATER_REFRACTION_INCLUDED
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#define URPWATER_REFRACTION_INCLUDED
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#include "URPWaterVariables.hlsl"
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#include "URPWaterHelpers.hlsl"
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//UNITY_DECLARE_SCREENSPACE_TEXTURE(_CameraOpaqueTexture);
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//TEXTURE2D(_CameraGBufferTexture2);
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void ComputeOpaqueAndDepth(inout GlobalData data, out float4 clearData, out float4 refractionData, out float2 refractionOffset)
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{
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// ======================================================================
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// Check if better way here:
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//https://catlikecoding.com/unity/tutorials/flow/looking-through-water/
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// Clean Data
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//clearData.rgb = SAMPLE_TEXTURE2D(_CameraOpaqueTexture, sampler_CameraOpaqueTexture_linear_clamp, data.screenUV.xy).rgb; // Color
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float2 screenUV = data.screenUV.xy;
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//UNITY_SAMPLE_SCREENSPACE_TEXTURE(_CameraOpaqueTexture, sampler_CameraOpaqueTexture_linear_clamp, screenUV);
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clearData.rgb = SampleSceneColor(screenUV); // Color
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clearData.a = SampleDepth(screenUV); // Depth
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// Distorted Data
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float2 distortionAmount = _CameraOpaqueTexture_TexelSize.xy * _Distortion.xx;
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// Far Distortion
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float farDistance = saturate(1 - length(data.worldPosition.rgb - _WorldSpaceCameraPos.xyz) / 50);
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distortionAmount = lerp(distortionAmount * 0.25, distortionAmount, farDistance);
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#if _DOUBLE_SIDED_ON
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distortionAmount = lerp(distortionAmount * 0.5, distortionAmount, data.vFace);
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#endif
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float2 offset = data.worldNormal.xz * distortionAmount;
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float2 GrabUV = OffsetUV(data.screenUV, offset);
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float2 DepthUV = OffsetDepth(data.screenUV, offset);
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float4 distortedData;
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//distortedData.rgb = UNITY_SAMPLE_SCREENSPACE_TEXTURE(_CameraOpaqueTexture, GrabUV.xy).rgb
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//distortedData.rgb = SAMPLE_TEXTURE2D(_CameraOpaqueTexture, sampler_CameraOpaqueTexture_linear_clamp, GrabUV).rgb; // Color
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//UNITY_SAMPLE_SCREENSPACE_TEXTURE(_CameraOpaqueTexture, sampler_CameraOpaqueTexture_linear_clamp, GrabUV);
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float rawDepth = SampleRawDepth(DepthUV);
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distortedData.rgb = SampleSceneColor(GrabUV); // Color
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distortedData.a = RawDepthToLinear(rawDepth);//SampleDepth(DepthUV); // Depth
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refractionData = data.pixelDepth > distortedData.a ? clearData : distortedData;
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refractionOffset = offset;
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data.refractionUV = DepthUV;
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data.rawDepthDst = rawDepth;
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}
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void ComputeRefractionData(inout GlobalData data)
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{
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float4 clearData;
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float4 refractionData;
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float2 refractionOffset;
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float rawDepth;
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float3 subNormal;
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ComputeOpaqueAndDepth(data, clearData, refractionData, refractionOffset);
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data.depth = DistanceFade(refractionData.a, data.pixelDepth, _DepthStart, _DepthEnd);
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// Compositing in lighting
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data.refractionData = refractionData;
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data.clearColor.rgb = clearData.rgb;
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data.sceneDepth = clearData.a;
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data.refractionOffset = refractionOffset;
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}
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#endif |