99 lines
3.2 KiB
HLSL
99 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_REFlECTIONS_INCLUDED
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#define URPWATER_REFlECTIONS_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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float3 SampleReflections(float3 worldNormal, float3 worldViewDir, float2 screenUV)
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{
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float3 reflection = 0;
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float2 refOffset = 0;
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#if _REFLECTIONMODE_CUBEMAP
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float3 reflectVector = reflect(-worldViewDir, worldNormal);
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reflection = SAMPLE_TEXTURECUBE(_CubemapTexture, sampler_CubemapTexture, reflectVector).rgb;
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#elif _REFLECTIONMODE_PROBES
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float3 reflectVector = reflect(-worldViewDir, worldNormal);
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reflection = GlossyEnvironmentReflection(reflectVector, _ReflectionRoughness * 0.1, 1);
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#elif _REFLECTIONMODE_REALTIME
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/*
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// get the perspective projection
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float2 p11_22 = float2(unity_CameraInvProjection._11, unity_CameraInvProjection._22) * 10;
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// conver the uvs into view space by "undoing" projection
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float3 viewDir = -(float3((screenUV * 2 - 1) / p11_22, -1));
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half3 viewNormal = mul(worldNormal, (float3x3)GetWorldToViewMatrix()).xyz;
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half3 reflectVector = reflect(-viewDir, viewNormal);
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*/
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float3 reflectVector = reflect(-worldViewDir, worldNormal);
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float2 reflectionUV = screenUV + worldNormal.zx * float2(0.02, 0.15);
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reflection = SAMPLE_TEXTURE2D_LOD(_ReflectionTexture, sampler_ScreenTextures_linear_clamp, reflectionUV, 6 * _ReflectionRoughness).rgb;//planar reflection
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#endif
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return reflection;
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}
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void ComputeReflections(inout GlobalData data, Varyings IN)
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{
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#if _REFLECTIONMODE_CUBEMAP || _REFLECTIONMODE_PROBES || _REFLECTIONMODE_REALTIME
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// Reflection Distortion
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float3 reflectionNormal = data.worldNormal;
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float3 n = IN.worldNormal;//float3(0, 1, 0);
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n.xz *= _ReflectionDistortion * 10;
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reflectionNormal = lerp(n, reflectionNormal, _ReflectionDistortion);
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// Fresnel Distortion
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#if _NORMAL_FADE_ON
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float fresnelFade = IN.paramsA.x * _ReflectionFresnelNormal;
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#else
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float fresnelFade = _ReflectionFresnelNormal;
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#endif
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float3 fresnelNormal = lerp(IN.worldNormal, data.worldNormal, fresnelFade);
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float fresnel = 1 - dot(fresnelNormal, data.worldViewDir);
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fresnel = pow(saturate(fresnel), _ReflectionFresnel);
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float3 reflection = SampleReflections(reflectionNormal, data.worldViewDir, data.screenUV.xy);
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float reflectionMask = _ReflectionIntensity;
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#if _FOAM_ON
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reflectionMask *= 1 - data.foamMask * 2;
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#endif
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//fresnel = smoothstep(0, _ReflectionFresnel, saturate(fresnel));
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float3 finalReflection = lerp(data.finalColor, saturate(reflection), fresnel * saturate(reflectionMask));
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#if _DOUBLE_SIDED_ON
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data.finalColor = lerp(data.finalColor, finalReflection, data.vFace);
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#else
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data.finalColor = finalReflection;
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#endif
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#endif
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data.finalColor += data.addLight;
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}
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#endif |