145 lines
5.3 KiB
Plaintext
145 lines
5.3 KiB
Plaintext
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// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
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//-----------------------------------------------------------------------------
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// NOTICE:
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// All functions in this file are deprecated and should not be use, they will be remove in a later version.
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// They are let here for backward compatibility.
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// This file gather several function related to different part of shader code like BRDF or image based lighting
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// to avoid to create multiple deprecated file, this file include deprecated function based on a define
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// to when including this file, it is expected that the caller define which deprecated function group he want to enable
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// Example, following code will include all deprecated BRDF functions:
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// #define INCLUDE_UNITY_STANDARD_BRDF_DEPRECATED
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// #include "UnityDeprecated.cginc"
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// #undef INCLUDE_UNITY_STANDARD_BRDF_DEPRECATED
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//-----------------------------------------------------------------------------
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#ifdef INCLUDE_UNITY_STANDARD_BRDF_DEPRECATED
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inline half3 LazarovFresnelTerm (half3 F0, half roughness, half cosA)
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{
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half t = Pow5 (1 - cosA); // ala Schlick interpoliation
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t /= 4 - 3 * roughness;
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return F0 + (1-F0) * t;
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}
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inline half3 SebLagardeFresnelTerm (half3 F0, half roughness, half cosA)
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{
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half t = Pow5 (1 - cosA); // ala Schlick interpoliation
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return F0 + (max (F0, roughness) - F0) * t;
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}
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// Cook-Torrance visibility term, doesn't take roughness into account
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inline half CookTorranceVisibilityTerm (half NdotL, half NdotV, half NdotH, half VdotH)
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{
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VdotH += 1e-5f;
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half G = min (1.0, min (
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(2.0 * NdotH * NdotV) / VdotH,
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(2.0 * NdotH * NdotL) / VdotH));
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return G / (NdotL * NdotV + 1e-4f);
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}
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// Kelemen-Szirmay-Kalos is an approximation to Cook-Torrance visibility term
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// http://sirkan.iit.bme.hu/~szirmay/scook.pdf
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inline half KelemenVisibilityTerm (half LdotH)
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{
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return 1.0 / (LdotH * LdotH);
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}
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// Modified Kelemen-Szirmay-Kalos which takes roughness into account, based on: http://www.filmicworlds.com/2014/04/21/optimizing-ggx-shaders-with-dotlh/
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inline half ModifiedKelemenVisibilityTerm (half LdotH, half perceptualRoughness)
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{
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half c = 0.797884560802865h; // c = sqrt(2 / Pi)
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half k = PerceptualRoughnessToRoughness(perceptualRoughness) * c;
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half gH = LdotH * (1-k) + k;
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return 1.0 / (gH * gH);
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}
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// Smith-Schlick derived for GGX
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inline half SmithGGXVisibilityTerm (half NdotL, half NdotV, half perceptualRoughness)
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{
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half k = (PerceptualRoughnessToRoughness(perceptualRoughness)) / 2; // derived by B. Karis, http://graphicrants.blogspot.se/2013/08/specular-brdf-reference.html
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return SmithVisibilityTerm (NdotL, NdotV, k);
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}
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inline half ImplicitVisibilityTerm ()
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{
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return 1;
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}
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// BlinnPhong normalized as reflection densitysity function (RDF)
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// ready for use directly as specular: spec=D
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// http://www.thetenthplanet.de/archives/255
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inline half RDFBlinnPhongNormalizedTerm (half NdotH, half n)
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{
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half normTerm = (n + 2.0) / (8.0 * UNITY_PI);
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half specTerm = pow (NdotH, n);
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return specTerm * normTerm;
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}
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// Decodes HDR textures
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// sm 2.0 is no longer supported
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inline half3 DecodeHDR_NoLinearSupportInSM2 (half4 data, half4 decodeInstructions)
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{
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// If Linear mode is not supported we can skip exponent part
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// In Standard shader SM2.0 and SM3.0 paths are always using different shader variations
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// SM2.0: hardware does not support Linear, we can skip exponent part
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#if defined(UNITY_COLORSPACE_GAMMA) && (SHADER_TARGET < 30)
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return (data.a * decodeInstructions.x) * data.rgb;
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#else
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return DecodeHDR(data, decodeInstructions);
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#endif
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}
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inline half DotClamped (half3 a, half3 b)
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{
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#if (SHADER_TARGET < 30)
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return saturate(dot(a, b));
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#else
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return max(0.0h, dot(a, b));
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#endif
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}
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inline half LambertTerm (half3 normal, half3 lightDir)
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{
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return DotClamped (normal, lightDir);
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}
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inline half BlinnTerm (half3 normal, half3 halfDir)
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{
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return DotClamped (normal, halfDir);
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}
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half RoughnessToSpecPower (half roughness)
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{
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return PerceptualRoughnessToSpecPower (roughness);
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}
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//-------------------------------------------------------------------------------------
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// Legacy, to keep backwards compatibility for (pre Unity 5.3) custom user shaders:
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#ifdef UNITY_COLORSPACE_GAMMA
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# define unity_LightGammaCorrectionConsts_PIDiv4 ((UNITY_PI/4)*(UNITY_PI/4))
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# define unity_LightGammaCorrectionConsts_HalfDivPI ((.5h/UNITY_PI)*(.5h/UNITY_PI))
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# define unity_LightGammaCorrectionConsts_8 (8*8)
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# define unity_LightGammaCorrectionConsts_SqrtHalfPI (2/UNITY_PI)
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#else
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# define unity_LightGammaCorrectionConsts_PIDiv4 (UNITY_PI/4)
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# define unity_LightGammaCorrectionConsts_HalfDivPI (.5h/UNITY_PI)
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# define unity_LightGammaCorrectionConsts_8 (8)
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# define unity_LightGammaCorrectionConsts_SqrtHalfPI (0.79788)
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#endif
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#endif // INCLUDE_UNITY_STANDARD_BRDF_DEPRECATED
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#ifdef INCLUDE_UNITY_IMAGE_BASED_LIGHTING_DEPRECATED
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// Old Unity_GlossyEnvironment signature. Kept only for backward compatibility and will be removed soon
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half3 Unity_GlossyEnvironment (UNITY_ARGS_TEXCUBE(tex), half4 hdr, half3 worldNormal, half perceptualRoughness)
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{
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Unity_GlossyEnvironmentData g;
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g.roughness /* perceptualRoughness */ = perceptualRoughness;
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g.reflUVW = worldNormal;
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return Unity_GlossyEnvironment (UNITY_PASS_TEXCUBE(tex), hdr, g);
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}
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#endif // INCLUDE_UNITY_IMAGE_BASED_LIGHTING_DEPRECATED
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