Initial commit

2026-06-02 20:24:26 -07:00 · 2022-01-22 20:13:49 -08:00
parent f9d23e5bcf
commit 687473573d
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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file Eyeball.cginc
+/// @brief Eyeball surface shader definition.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_LEGACY_SHADERS_DEFINITION_EYEBALL_CGINC
+#define ALLOY_LEGACY_SHADERS_DEFINITION_EYEBALL_CGINC
+
+#define A_NORMAL_MAPPING_ON
+#define A_AMBIENT_OCCLUSION_ON
+#define A_SPECULAR_TINT_ON
+#define A_CLEARCOAT_ON
+#define A_EYE_PARALLAX_REFRACTION
+#define A_DETAIL_MASK_OFF
+
+#include "Assets/Alloy/Shaders/Lighting/Standard.cginc"
+#include "Assets/Alloy/Shaders/Type/Standard.cginc"
+#include "Assets/Alloy/Legacy/Shaders/Feature/EyeParallax.cginc"
+
+/// Cornea normals.
+/// Expects a compressed normal map.
+sampler2D _EyeBumpMap;
+
+/// Cornea weight.
+/// Expects values in the range [0,1].
+half _EyeCorneaWeight;
+
+/// Cornea roughness.
+/// Expects values in the range [0,1].
+half _EyeRoughness;
+
+/// Schlera tint color.
+/// Expects a linear LDR color.
+half3 _EyeScleraColor;
+
+/// Iris tint color.
+/// Expects a linear LDR color.
+half3 _EyeColor;
+
+/// Iris specular tint by base color.
+/// Expects values in the range [0,1].
+half _EyeSpecularTint;
+
+/// Samples  and scales the base bump map.
+/// @param  s       Material surface data.
+/// @param  scale   Normal XY scale factor.
+/// @return         Normalized tangent-space normal.
+half3 aSampleBumpScaleOld(
+    ASurface s,
+    half scale)
+{
+    half4 result = 0.0h;
+
+#ifdef _VIRTUALTEXTURING_ON
+    result = VTSampleNormal(s.baseVirtualCoord);
+#else
+    result = tex2D(_BumpMap, s.baseUv);
+#endif
+
+    return UnpackScaleNormal(result, _BumpScale * scale);
+}
+
+void aSurfaceShader(
+    inout ASurface s)
+{
+    float4 uv01 = s.uv01;
+        
+    aEyeParallax(s);    
+    aDissolve(s);
+    
+    // Iris
+    half4 base = aBase(s);
+    half4 material = aSampleMaterial(s);
+    half irisMask = material.A_METALLIC_CHANNEL;
+
+    s.baseColor = base.rgb * lerp(_EyeScleraColor, _EyeColor, irisMask);
+    s.metallic = 0.0h;
+    s.ambientOcclusion = aLerpOneTo(material.A_AO_CHANNEL, _Occlusion);
+    s.specularity = _Specularity * material.A_SPECULARITY_CHANNEL;
+    s.specularTint = _EyeSpecularTint * irisMask;
+    s.roughness = _Roughness * material.A_ROUGHNESS_CHANNEL;
+
+    // Cornea
+    half bumpMask = s.clearCoat * 0.95h;
+    half3 corneaNormalTangent = UnpackScaleNormal(tex2D(_EyeBumpMap, s.baseUv), bumpMask);
+    half3 irisScleraNormalTangent = aSampleBumpScaleOld(s, 1.0h - bumpMask);
+
+    s.clearCoat = _EyeCorneaWeight * irisMask;
+    s.clearCoatRoughness = _EyeRoughness;
+    s.normalTangent = A_NT(s, BlendNormals(irisScleraNormalTangent, corneaNormalTangent));
+
+    s.mask = 1.0h - irisMask;
+    aDetail(s); 
+    s.mask = 1.0h;
+    
+    aEmission(s);
+    
+    // Remove parallax so these appears on top of the cornea!
+    s.uv01 = uv01;
+    aDecal(s); 
+    aRim(s);
+}
+
+#endif // ALLOY_LEGACY_SHADERS_DEFINITION_EYEBALL_CGINC