yum-archive/2ner

git clone https://git.yummers.dev/yum-archive/2ner

yumbuncha shitttt0a8d7442026-07-03

#ifndef __FILAMENTED_INC
#define __FILAMENTED_INC

#include "SharedSamplingLib.hlsl"
#include "SharedFilteringLib.hlsl"

#include "UnityImageBasedLighting.cginc"
#include "UnityStandardUtils.cginc"

#include "data.cginc"
#include "math.cginc"

// I made changes to this code.

/*
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Unity Built-in Shaders   

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*/

// Check if Bakery is available
#if defined(_BAKERY_RNM) || defined(_BAKERY_SH) || defined(_BAKERY_MONOSH)
    #define USING_BAKERY 1
#endif

// Bakery textures (Unity auto-binds these)
#if defined(_BAKERY_RNM) || defined(_BAKERY_SH) || defined(_BAKERY_MONOSH)
TEXTURE2D(_RNM0);
TEXTURE2D(_RNM1);
TEXTURE2D(_RNM2);
SAMPLER(sampler_RNM0);
#endif



#define MIN_PERCEPTUAL_ROUGHNESS 0.045

// Filamented defines for spherical harmonics
#define SPHERICAL_HARMONICS_DEFAULT         0
#define SPHERICAL_HARMONICS_GEOMETRICS      1
#define SPHERICAL_HARMONICS_ZH3             2
#define SPHERICAL_HARMONICS SPHERICAL_HARMONICS_ZH3
#define SPHERICAL_HARMONICS_USE_L2          0

// Light struct from filamented
struct Light {
    float4 colorIntensity;
    float3 l;
    float attenuation;
    float NoL;
    float3 worldPosition;
};

// Helper functions
half getExposureOcclusionBias()
{
    return 1.0/(_ExposureOcclusion);
}

bool getIsBakeryVertexMode()
{
#if defined(USING_BAKERY_VERTEXLM)
    #define BAKERYMODE_DEFAULT 0
    #define BAKERYMODE_VERTEXLM 1.0f
    #define BAKERYMODE_RNM 2.0f
    #define BAKERYMODE_SH 3.0f
    return (bakeryLightmapMode == BAKERYMODE_VERTEXLM);
#endif
    return false;
}

half getLightVolumeSurfaceBias()
{
    #if defined(_VRCLV)
    return _VRCLVSurfaceBias;
    #else
    return 0;
    #endif
}

// Geomerics spherical harmonics evaluation
float shEvaluateDiffuseL1Geomerics_local(float L0, float3 L1, float3 n)
{
    float R0 = max(L0, 0);
    float3 R1 = 0.5f * L1;
    float lenR1 = length(R1);
    float q = dot(normalize(R1), n) * 0.5 + 0.5;
    q = saturate(q);
    float p = 1.0f + 2.0f * lenR1 / R0;
    float a = (1.0f - lenR1 / R0) / (1.0f + lenR1 / R0);
    return R0 * (a + (1.0f - a) * (p + 1.0f) * pow(q, p));
}

// ZH3 constants and functions
const static float L0IrradianceToRadiance = 2 * sqrt(UNITY_PI);
const static float L1IrradianceToRadiance = sqrt(3 * UNITY_PI);
const static float4 L0L1IrradianceToRadiance = float4(L0IrradianceToRadiance, L1IrradianceToRadiance, L1IrradianceToRadiance, L1IrradianceToRadiance);

float SHEvalLinearL0L1_ZH3Hallucinate(float4 sh, float3 normal)
{
    float4 radiance = sh * L0L1IrradianceToRadiance;
    float3 zonalAxis = float3(radiance.w, radiance.y, radiance.z);
    float l1Length = length(zonalAxis);
    zonalAxis /= l1Length;
    float ratio = l1Length / radiance.x;
    float zonalL2Coeff = radiance.x * ratio * (0.08 + 0.6 * ratio);
    float fZ = dot(zonalAxis, normal);
    float zhNormal = sqrt(5.0f / (16.0f * UNITY_PI)) * (3.0f * fZ * fZ - 1.0f);
    float result = dot(sh, float4(1, float3(normal.y, normal.z, normal.x)));
    result += 0.25f * zhNormal * zonalL2Coeff;
    return result;
}

float3 SHEvalLinearL0L1_ZH3Hallucinate(float3 normal)
{
    float3 shL0 = float3(unity_SHAr.w, unity_SHAg.w, unity_SHAb.w) +
        float3(unity_SHBr.z, unity_SHBg.z, unity_SHBb.z) / 3.0;
    float3 shL1_1 = float3(unity_SHAr.y, unity_SHAg.y, unity_SHAb.y);
    float3 shL1_2 = float3(unity_SHAr.z, unity_SHAg.z, unity_SHAb.z);
    float3 shL1_3 = float3(unity_SHAr.x, unity_SHAg.x, unity_SHAb.x);

    float3 result = 0.0;
    float4 a = float4(shL0.r, shL1_1.r, shL1_2.r, shL1_3.r);
    float4 b = float4(shL0.g, shL1_1.g, shL1_2.g, shL1_3.g);
    float4 c = float4(shL0.b, shL1_1.b, shL1_2.b, shL1_3.b);
    result.r = SHEvalLinearL0L1_ZH3Hallucinate(a, normal);
    result.g = SHEvalLinearL0L1_ZH3Hallucinate(b, normal);
    result.b = SHEvalLinearL0L1_ZH3Hallucinate(c, normal);
    return result;
}

float3 Irradiance_SphericalHarmonics(const float3 n, const bool useL2) {
    float3 finalSH = float3(0,0,0); 

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_DEFAULT)
        finalSH = SHEvalLinearL0L1(half4(n, 1.0));
    #endif

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_GEOMETRICS)
        float3 L0 = float3(unity_SHAr.w, unity_SHAg.w, unity_SHAb.w);
        float3 L0L2 = float3(unity_SHBr.z, unity_SHBg.z, unity_SHBb.z) / 3.0;
        L0 = (useL2) ? L0+L0L2 : L0-L0L2;
        finalSH.r = shEvaluateDiffuseL1Geomerics_local(L0.r, unity_SHAr.xyz, n);
        finalSH.g = shEvaluateDiffuseL1Geomerics_local(L0.g, unity_SHAg.xyz, n);
        finalSH.b = shEvaluateDiffuseL1Geomerics_local(L0.b, unity_SHAb.xyz, n);
    #endif

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_ZH3)
        finalSH = SHEvalLinearL0L1_ZH3Hallucinate(half4(n, 1.0));
    #endif

    #if (SPHERICAL_HARMONICS_USE_L2 == 1)
        if (useL2) finalSH += SHEvalLinearL2(half4(n, 1.0));
    #endif    

    return finalSH;
}

float3 Irradiance_SphericalHarmonics(const float3 n) {
    return Irradiance_SphericalHarmonics(n, true);
}

#if UNITY_LIGHT_PROBE_PROXY_VOLUME
half3 Irradiance_SampleProbeVolume (half4 normal, float3 worldPos)
{
    const float transformToLocal = unity_ProbeVolumeParams.y;
    const float texelSizeX = unity_ProbeVolumeParams.z;

    float3 position = (transformToLocal == 1.0f) ? mul(unity_ProbeVolumeWorldToObject, float4(worldPos, 1.0)).xyz : worldPos;
    float3 texCoord = (position - unity_ProbeVolumeMin.xyz) * unity_ProbeVolumeSizeInv.xyz;
    texCoord.x = texCoord.x * 0.25f;

    float texCoordX = clamp(texCoord.x, 0.5f * texelSizeX, 0.25f - 0.5f * texelSizeX);

    texCoord.x = texCoordX;
    half4 SHAr = UNITY_SAMPLE_TEX3D_SAMPLER(unity_ProbeVolumeSH, unity_ProbeVolumeSH, texCoord);

    texCoord.x = texCoordX + 0.25f;
    half4 SHAg = UNITY_SAMPLE_TEX3D_SAMPLER(unity_ProbeVolumeSH, unity_ProbeVolumeSH, texCoord);

    texCoord.x = texCoordX + 0.5f;
    half4 SHAb = UNITY_SAMPLE_TEX3D_SAMPLER(unity_ProbeVolumeSH, unity_ProbeVolumeSH, texCoord);

    half3 x1;

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_DEFAULT)
        x1.r = dot(SHAr, normal);
        x1.g = dot(SHAg, normal);
        x1.b = dot(SHAb, normal);
    #endif

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_GEOMETRICS)
        x1.r = shEvaluateDiffuseL1Geomerics_local(SHAr.w, SHAr.rgb, normal);
        x1.g = shEvaluateDiffuseL1Geomerics_local(SHAg.w, SHAg.rgb, normal);
        x1.b = shEvaluateDiffuseL1Geomerics_local(SHAb.w, SHAb.rgb, normal);
    #endif

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_ZH3)
        x1.r = SHEvalLinearL0L1_ZH3Hallucinate(float4(SHAr.w, SHAr.rgb), normal);
        x1.g = SHEvalLinearL0L1_ZH3Hallucinate(float4(SHAg.w, SHAg.rgb), normal);
        x1.b = SHEvalLinearL0L1_ZH3Hallucinate(float4(SHAb.w, SHAb.rgb), normal);
    #endif

    return x1;
}
#endif

#if defined(_VRCLV)
half3 Irradiance_SampleVRCLightVolume(half3 normal, float3 worldPos, out Light derivedLight)
{
    derivedLight = (Light)0;
    float3 samplePos = worldPos + normal * getLightVolumeSurfaceBias();
    
    float3 L0, L1r, L1g, L1b;
    LightVolumeSH(samplePos, L0, L1r, L1g, L1b);

    half3 irradiance = 0.0;

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_DEFAULT)
        irradiance.r = dot(L1r, normal.xyz) + L0.r;
        irradiance.g = dot(L1g, normal.xyz) + L0.g;
        irradiance.b = dot(L1b, normal.xyz) + L0.b;
    #endif

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_GEOMETRICS)
        irradiance.r = shEvaluateDiffuseL1Geomerics_local(L0.r, L1r, normal.xyz);
        irradiance.g = shEvaluateDiffuseL1Geomerics_local(L0.g, L1g, normal.xyz);
        irradiance.b = shEvaluateDiffuseL1Geomerics_local(L0.b, L1b, normal.xyz);
    #endif

    #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_ZH3)
        irradiance.r = shEvaluateDiffuseL1Geomerics_local(L0.r, L1r, normal.xyz);
        irradiance.g = shEvaluateDiffuseL1Geomerics_local(L0.g, L1g, normal.xyz);
        irradiance.b = shEvaluateDiffuseL1Geomerics_local(L0.b, L1b, normal.xyz);
    #endif
    
    #if defined(LIGHTMAP_SPECULAR)
    float3 nL1x = float3(L1r[0], L1g[0], L1b[0]);
    float3 nL1y = float3(L1r[1], L1g[1], L1b[1]);
    float3 nL1z = float3(L1r[2], L1g[2], L1b[2]);
    float3 dominantDir = float3(luminance(nL1x), luminance(nL1y), luminance(nL1z));

    derivedLight.l = dominantDir;
    half directionality = max(FLT_EPS, length(derivedLight.l));
    derivedLight.l /= directionality;

    derivedLight.colorIntensity = float4(irradiance * directionality, 1.0);
    derivedLight.attenuation = directionality;
    derivedLight.NoL = saturate(dot(normal, derivedLight.l));
    #endif

    return irradiance;
}

half3 Irradiance_SampleVRCLightVolumeAdditive(half3 normal, float3 worldPos, out Light derivedLight)
{
    derivedLight = (Light)0;

    if (!_UdonLightVolumeEnabled || _UdonLightVolumeAdditiveCount == 0) return 0;
    
    float3 L0, L1r, L1g, L1b;
    LightVolumeAdditiveSH(worldPos, L0, L1r, L1g, L1b);

    half3 irradiance = 0.0;
    irradiance.r = dot(L1r, normal.xyz) + L0.r;
    irradiance.g = dot(L1g, normal.xyz) + L0.g;
    irradiance.b = dot(L1b, normal.xyz) + L0.b;
    
    #if defined(LIGHTMAP_SPECULAR)
    float3 nL1x = float3(L1r[0], L1g[0], L1b[0]);
    float3 nL1y = float3(L1r[1], L1g[1], L1b[1]);
    float3 nL1z = float3(L1r[2], L1g[2], L1b[2]);
    float3 dominantDir = float3(luminance(nL1x), luminance(nL1y), luminance(nL1z));

    derivedLight.l = dominantDir;
    half directionality = max(FLT_EPS, length(derivedLight.l));
    derivedLight.l /= directionality;

    derivedLight.colorIntensity = float4(irradiance * directionality, 1.0);
    derivedLight.attenuation = directionality;
    derivedLight.NoL = saturate(dot(normal, derivedLight.l));
    #endif

    return irradiance;
}
#endif

half3 Irradiance_SphericalHarmonicsUnity (half3 normal, half3 ambient, float3 worldPos, out Light derivedLight)
{
    half3 ambient_contrib = 0.0;
    derivedLight = (Light)0;

#if defined(_VRCLV)
    #if UNITY_LIGHT_PROBE_PROXY_VOLUME
        if (unity_ProbeVolumeParams.x == 1.0)
            ambient_contrib = Irradiance_SampleProbeVolume(half4(normal, 1.0), worldPos);
        else
            ambient_contrib = Irradiance_SampleVRCLightVolume(normal, worldPos, derivedLight);
    #else
        ambient_contrib = Irradiance_SampleVRCLightVolume(normal, worldPos, derivedLight);
    #endif

    ambient += max(half3(0, 0, 0), ambient_contrib);

    #ifdef UNITY_COLORSPACE_GAMMA
        ambient = LinearToGammaSpace (ambient);
    #endif

    return ambient;
#else

    #if UNITY_SAMPLE_FULL_SH_PER_PIXEL
        #if UNITY_LIGHT_PROBE_PROXY_VOLUME
            if (unity_ProbeVolumeParams.x == 1.0)
                ambient_contrib = Irradiance_SampleProbeVolume(half4(normal, 1.0), worldPos);
            else
                ambient_contrib = Irradiance_SphericalHarmonics(normal, true);
        #else
            ambient_contrib = Irradiance_SphericalHarmonics(normal, true);
        #endif

            ambient += max(half3(0, 0, 0), ambient_contrib);

        #ifdef UNITY_COLORSPACE_GAMMA
            ambient = LinearToGammaSpace(ambient);
        #endif
    #elif (SHADER_TARGET < 30) || UNITY_STANDARD_SIMPLE
        // Completely per-vertex
    #else
        #if UNITY_LIGHT_PROBE_PROXY_VOLUME
            if (unity_ProbeVolumeParams.x == 1.0)
                ambient_contrib = Irradiance_SampleProbeVolume (half4(normal, 1.0), worldPos);
            else
                ambient_contrib = Irradiance_SphericalHarmonics(normal, false);
        #else
            ambient_contrib = Irradiance_SphericalHarmonics(normal, false);
        #endif

        ambient = max(half3(0, 0, 0), ambient+ambient_contrib);
        #ifdef UNITY_COLORSPACE_GAMMA
            ambient = LinearToGammaSpace (ambient);
        #endif
    #endif

    return ambient;
#endif
}

float4 SampleLightmapBicubic(float2 uv)
{
    #if defined(SHADER_API_D3D11)
        float width, height;
        unity_Lightmap.GetDimensions(width, height);
        float4 unity_Lightmap_TexelSize = float4(width, height, 1.0/width, 1.0/height);
        return SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(unity_Lightmap, samplerunity_Lightmap),
            uv, unity_Lightmap_TexelSize);
    #else
        return SAMPLE_TEXTURE2D(unity_Lightmap, samplerunity_Lightmap, uv);
    #endif
}

float4 SampleLightmapDirBicubic(float2 uv)
{
    #if defined(SHADER_API_D3D11) && false
        float width, height;
        unity_LightmapInd.GetDimensions(width, height);
        float4 unity_LightmapInd_TexelSize = float4(width, height, 1.0/width, 1.0/height);
        return SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(unity_LightmapInd, samplerunity_Lightmap),
            uv, unity_LightmapInd_TexelSize);
    #else
        return SAMPLE_TEXTURE2D(unity_LightmapInd, samplerunity_Lightmap, uv);
    #endif
}

float4 SampleDynamicLightmapBicubic(float2 uv)
{
    #if defined(SHADER_API_D3D11)
        float width, height;
        unity_DynamicLightmap.GetDimensions(width, height);
        float4 unity_DynamicLightmap_TexelSize = float4(width, height, 1.0/width, 1.0/height);
        return SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(unity_DynamicLightmap, samplerunity_DynamicLightmap),
            uv, unity_DynamicLightmap_TexelSize);
    #else
        return SAMPLE_TEXTURE2D(unity_DynamicLightmap, samplerunity_DynamicLightmap, uv);
    #endif
}

float4 SampleDynamicLightmapDirBicubic(float2 uv)
{
    #if defined(SHADER_API_D3D11) && false
        float width, height;
        unity_DynamicDirectionality.GetDimensions(width, height);
        float4 unity_DynamicDirectionality_TexelSize = float4(width, height, 1.0/width, 1.0/height);
        return SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(unity_DynamicDirectionality, samplerunity_DynamicLightmap),
            uv, unity_DynamicDirectionality_TexelSize);
    #else
        return SAMPLE_TEXTURE2D(unity_DynamicDirectionality, samplerunity_DynamicLightmap, uv);
    #endif
}

inline float3 DecodeDirectionalLightmapSpecular(half3 color, half4 dirTex, half3 normalWorld, 
    const bool isRealtimeLightmap, fixed4 realtimeNormalTex, out Light o_light)
{
    o_light = (Light)0;
    o_light.colorIntensity = float4(color, 1.0);
    o_light.l = dirTex.xyz * 2 - 1;

    half directionality = max(0.001, length(o_light.l));
    o_light.l /= directionality;

    #ifdef DYNAMICLIGHTMAP_ON
    if (isRealtimeLightmap)
    {
        half3 realtimeNormal = realtimeNormalTex.xyz * 2 - 1;
        o_light.colorIntensity /= max(0.125, dot(realtimeNormal, o_light.l));
    }
    #endif

    half3 ambient = o_light.colorIntensity * (1 - directionality);
    o_light.colorIntensity = o_light.colorIntensity * directionality;
    o_light.attenuation = directionality;
    o_light.NoL = saturate(dot(normalWorld, o_light.l));

    return color;
}

#if defined(USING_BAKERY) && defined(LIGHTMAP_ON)
float3 DecodeRNMLightmap(half3 color, half2 lightmapUV, half3 normalTangent, float3x3 tangentToWorld, out Light o_light)
{
    const float rnmBasis0 = float3(0.816496580927726f, 0, 0.5773502691896258f);
    const float rnmBasis1 = float3(-0.4082482904638631f, 0.7071067811865475f, 0.5773502691896258f);
    const float rnmBasis2 = float3(-0.4082482904638631f, -0.7071067811865475f, 0.5773502691896258f);

    float3 irradiance;
    o_light = (Light)0;

    #if defined(SHADER_API_D3D11)
        float width, height;
        _RNM0.GetDimensions(width, height);
        float4 rnm_TexelSize = float4(width, height, 1.0/width, 1.0/height);
        
        float3 rnm0 = DecodeLightmap(SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(_RNM0, sampler_RNM0), lightmapUV, rnm_TexelSize));
        float3 rnm1 = DecodeLightmap(SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(_RNM1, sampler_RNM0), lightmapUV, rnm_TexelSize));
        float3 rnm2 = DecodeLightmap(SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(_RNM2, sampler_RNM0), lightmapUV, rnm_TexelSize));
    #else
        float3 rnm0 = DecodeLightmap(SAMPLE_TEXTURE2D(_RNM0, sampler_RNM0, lightmapUV));
        float3 rnm1 = DecodeLightmap(SAMPLE_TEXTURE2D(_RNM1, sampler_RNM0, lightmapUV));
        float3 rnm2 = DecodeLightmap(SAMPLE_TEXTURE2D(_RNM2, sampler_RNM0, lightmapUV));
    #endif

    normalTangent.g *= -1;

    irradiance =  saturate(dot(rnmBasis0, normalTangent)) * rnm0
                + saturate(dot(rnmBasis1, normalTangent)) * rnm1
                + saturate(dot(rnmBasis2, normalTangent)) * rnm2;

    #if defined(LIGHTMAP_SPECULAR)
    float3 dominantDirT = rnmBasis0 * luminance(rnm0) +
                          rnmBasis1 * luminance(rnm1) +
                          rnmBasis2 * luminance(rnm2);

    float3 dominantDirTN = normalize(dominantDirT);
    float3 specColor = saturate(dot(rnmBasis0, dominantDirTN)) * rnm0 +
                       saturate(dot(rnmBasis1, dominantDirTN)) * rnm1 +
                       saturate(dot(rnmBasis2, dominantDirTN)) * rnm2;                        

    o_light.l = normalize(mul(tangentToWorld, dominantDirT));
    half directionality = max(0.001, length(o_light.l));
    o_light.l /= directionality;

    o_light.colorIntensity = float4(specColor * directionality, 1.0);
    o_light.attenuation = directionality;
    o_light.NoL = saturate(dot(normalTangent, dominantDirTN));
    #endif

    return irradiance;
}

float3 DecodeSHLightmap(half3 L0, half2 lightmapUV, half3 normalWorld, out Light o_light)
{
    float3 irradiance;
    o_light = (Light)0;

    #if defined(SHADER_API_D3D11)
        float width, height;
        _RNM0.GetDimensions(width, height);
        float4 rnm_TexelSize = float4(width, height, 1.0/width, 1.0/height);
        
        float3 nL1x = SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(_RNM0, sampler_RNM0), lightmapUV, rnm_TexelSize);
        float3 nL1y = SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(_RNM1, sampler_RNM0), lightmapUV, rnm_TexelSize);
        float3 nL1z = SampleTexture2DBicubicFilter(TEXTURE2D_ARGS(_RNM2, sampler_RNM0), lightmapUV, rnm_TexelSize);
    #else
        float3 nL1x = SAMPLE_TEXTURE2D(_RNM0, sampler_RNM0, lightmapUV);
        float3 nL1y = SAMPLE_TEXTURE2D(_RNM1, sampler_RNM0, lightmapUV);
        float3 nL1z = SAMPLE_TEXTURE2D(_RNM2, sampler_RNM0, lightmapUV);
    #endif

    nL1x = nL1x * 2 - 1;
    nL1y = nL1y * 2 - 1;
    nL1z = nL1z * 2 - 1;
    float3 L1x = nL1x * L0 * 2;
    float3 L1y = nL1y * L0 * 2;
    float3 L1z = nL1z * L0 * 2;

    #ifdef BAKERY_SHNONLINEAR
        float lumaL0 = dot(L0, float(1));
        float lumaL1x = dot(L1x, float(1));
        float lumaL1y = dot(L1y, float(1));
        float lumaL1z = dot(L1z, float(1));

        float lumaSH = shEvaluateDiffuseL1Geomerics_local(lumaL0, float3(lumaL1x, lumaL1y, lumaL1z), normalWorld);

        #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_ZH3)
            lumaSH = SHEvalLinearL0L1_ZH3Hallucinate(float4(lumaL0, lumaL1y, lumaL1z, lumaL1x), normalWorld);
        #endif

        irradiance = L0 + normalWorld.x * L1x + normalWorld.y * L1y + normalWorld.z * L1z;
        float regularLumaSH = dot(irradiance, 1);
        irradiance *= lerp(1, lumaSH / regularLumaSH, saturate(regularLumaSH*16));
    #else
        irradiance = L0 + normalWorld.x * L1x + normalWorld.y * L1y + normalWorld.z * L1z;
    #endif

    #if defined(LIGHTMAP_SPECULAR)
    float3 dominantDir = float3(luminance(nL1x), luminance(nL1y), luminance(nL1z));

    o_light.l = dominantDir;
    half directionality = max(0.001, length(o_light.l));
    o_light.l /= directionality;

    o_light.colorIntensity = float4(irradiance * directionality, 1.0);
    o_light.attenuation = directionality;
    o_light.NoL = saturate(dot(normalWorld, o_light.l));
    #endif

    return irradiance;
}

float3 DecodeSHLightmapVertex(half3 L0, half3 ambientSH[3], half3 normalWorld, out Light o_light)
{
    float3 irradiance;
    o_light = (Light)0;

    float3 nL1x = ambientSH[0];
    float3 nL1y = ambientSH[1];
    float3 nL1z = ambientSH[2];

    nL1x = nL1x * 2 - 1;
    nL1y = nL1y * 2 - 1;
    nL1z = nL1z * 2 - 1;
    float3 L1x = nL1x * L0 * 2;
    float3 L1y = nL1y * L0 * 2;
    float3 L1z = nL1z * L0 * 2;

    #ifdef BAKERY_SHNONLINEAR
        float lumaL0 = dot(L0, float(1));
        float lumaL1x = dot(L1x, float(1));
        float lumaL1y = dot(L1y, float(1));
        float lumaL1z = dot(L1z, float(1));
        float lumaSH = shEvaluateDiffuseL1Geomerics_local(lumaL0, float3(lumaL1x, lumaL1y, lumaL1z), normalWorld);

        #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_ZH3)
            lumaSH = SHEvalLinearL0L1_ZH3Hallucinate(float4(lumaL0, lumaL1y, lumaL1z, lumaL1x), normalWorld);
        #endif

        irradiance = L0 + normalWorld.x * L1x + normalWorld.y * L1y + normalWorld.z * L1z;
        float regularLumaSH = dot(irradiance, 1);
        irradiance *= lerp(1, lumaSH / regularLumaSH, saturate(regularLumaSH*16));
    #else
        irradiance = L0 + normalWorld.x * L1x + normalWorld.y * L1y + normalWorld.z * L1z;
    #endif

    #if defined(LIGHTMAP_SPECULAR)
    float3 dominantDir = float3(luminance(nL1x), luminance(nL1y), luminance(nL1z));

    o_light.l = dominantDir;
    half directionality = max(0.001, length(o_light.l));
    o_light.l /= directionality;

    o_light.colorIntensity = float4(irradiance * directionality, 1.0);
    o_light.attenuation = directionality;
    o_light.NoL = saturate(dot(normalWorld, o_light.l));
    #endif

    return irradiance;
}
#endif

#if defined(_BAKERY_MONOSH)
float3 DecodeMonoSHLightmap(half3 L0, half3 dominantDir, half3 normalWorld, out Light o_light, const bool remapDir = true)
{
    o_light = (Light)0;

    float3 nL1 = remapDir? dominantDir * 2 - 1 : dominantDir;
    float3 L1x = nL1.x * L0 * 2;
    float3 L1y = nL1.y * L0 * 2;
    float3 L1z = nL1.z * L0 * 2;

    float3 sh;

    #if BAKERY_SHNONLINEAR
        float lumaL0 = dot(L0, 1);
        float lumaL1x = dot(L1x, 1);
        float lumaL1y = dot(L1y, 1);
        float lumaL1z = dot(L1z, 1);
        float lumaSH = shEvaluateDiffuseL1Geomerics_local(lumaL0, float3(lumaL1x, lumaL1y, lumaL1z), normalWorld);

        #if (SPHERICAL_HARMONICS == SPHERICAL_HARMONICS_ZH3)
            lumaSH = SHEvalLinearL0L1_ZH3Hallucinate(float4(lumaL0, lumaL1y, lumaL1z, lumaL1x), normalWorld);
        #endif

        sh = L0 + normalWorld.x * L1x + normalWorld.y * L1y + normalWorld.z * L1z;
        float regularLumaSH = dot(sh, 1);

        sh *= lerp(1, lumaSH / regularLumaSH, saturate(regularLumaSH*16));
    #else
        sh = L0 + normalWorld.x * L1x + normalWorld.y * L1y + normalWorld.z * L1z;
    #endif

    #if defined(LIGHTMAP_SPECULAR)
    dominantDir = nL1;

    o_light.l = dominantDir;
    half directionality = max(0.001, length(o_light.l));
    o_light.l /= directionality;

    o_light.colorIntensity = float4(L0 * directionality, 1.0);
    o_light.attenuation = directionality;
    o_light.NoL = saturate(dot(normalWorld, o_light.l));
    #endif

    return sh;
}
#endif

float IrradianceToExposureOcclusion(float3 irradiance)
{
    return saturate(length(irradiance + FLT_EPS) * getExposureOcclusionBias());
}

float3 specularDFG(const float3 dfg, const float3 f0) {
	return lerp(dfg.xxx, dfg.yyy, f0);
}

float D_GGX(float roughness, float NoH, const float3 h) {
	// Walter et al. 2007, "Microfacet Models for Refraction through Rough Surfaces"

	// In mediump, there are two problems computing 1.0 - NoH^2
	// 1) 1.0 - NoH^2 suffers floating point cancellation when NoH^2 is close to 1 (highlights)
	// 2) NoH doesn't have enough precision around 1.0
	// Both problem can be fixed by computing 1-NoH^2 in highp and providing NoH in highp as well

	// However, we can do better using Lagrange's identity:
	//      ||a x b||^2 = ||a||^2 ||b||^2 - (a . b)^2
	// since N and H are unit vectors: ||N x H||^2 = 1.0 - NoH^2
	// This computes 1.0 - NoH^2 directly (which is close to zero in the highlights and has
	// enough precision).
	// Overall this yields better performance, keeping all computations in mediump
	// Not available without reworking to pass NxH to the function
	float oneMinusNoHSquared = 1.0 - NoH * NoH;
	float a = NoH * roughness;
	float k = roughness / (oneMinusNoHSquared + a * a);
	float d = k * k * (1.0 / PI);
	return d;
}

// t = tangent vector, b = bitangent vector
float D_GGX_Anisotropic(float at, float ab, float NoH,
        const float3 h,
        const float3 t, const float3 b) {
    float ToH = dot(t, h);
    float BoH = dot(b, h);
    float a2 = at * ab;
    float3 v = float3(ab * ToH, at * BoH, a2 * NoH);
    float v2 = dot(v, v);
    float w2 = a2 / v2;
    return a2 * w2 * w2 * (1.0 / PI);
}

float F_Schlick(float f0, float VoH) {
	return f0 + (1.0 - f0) * pow5(1.0 - VoH);
}

float F_Schlick(float f0, float f90, float VoH) {
    // Schlick 1994, "An Inexpensive BRDF Model for Physically-Based Rendering"
    return f0 + (f90 - f0) * pow5(1.0 - VoH);
}

float3 F_Schlick(const float3 f0, float VoH) {
    float f = pow5(1.0 - VoH);
    return f + f0 * (1.0 - f);
}

float3 F_Schlick(const float3 f0, float f90, float VoH) {
    // Schlick 1994, "An Inexpensive BRDF Model for Physically-Based Rendering"
    return f0 + (f90 - f0) * pow5(1.0 - VoH);
}

float Fd_Lambert() {
    return 1.0 / PI;
}

float Fd_Burley(float roughness, float NoV, float NoL, float LoH) {
    // Burley 2012, "Physically-Based Shading at Disney"
    float f90 = 0.5 + 2.0 * roughness * LoH * LoH;
    float lightScatter = F_Schlick(1.0, f90, NoL);
    float viewScatter = F_Schlick(1.0, f90, NoV);
    return lightScatter * viewScatter * (1.0 / PI);
}

float V_SmithGGXCorrelated(float roughness, float NoV, float NoL) {
	// Heitz 2014, "Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs"
	float a2 = roughness * roughness;
	float lambdaV = NoL * sqrt((NoV - a2 * NoV) * NoV + a2);
	float lambdaL = NoV * sqrt((NoL - a2 * NoL) * NoL + a2);
	float v = 0.5 / (lambdaV + lambdaL);
	return v;
}

float V_SmithGGXCorrelated_Fast(float roughness, float NoV, float NoL) {
    // Hammon 2017, "PBR Diffuse Lighting for GGX+Smith Microsurfaces"
    float v = 0.5 / lerp(2.0 * NoL * NoV, NoL + NoV, roughness);
    return v;
}

float V_SmithGGXCorrelated_Anisotropic(float at, float ab, float ToV, float BoV,
        float ToL, float BoL, float NoV, float NoL) {
    float lambdaV = NoL * length(float3(at * ToV, ab * BoV, NoV));
    float lambdaL = NoV * length(float3(at * ToL, ab * BoL, NoL));
    float v = 0.5 / (lambdaV + lambdaL);
    return saturate(v);
}

float perceptualRoughnessToRoughness(float perceptualRoughness) {
    return perceptualRoughness * perceptualRoughness;
}

float roughnessToPerceptualRoughness(float roughness) {
    return sqrt(roughness);
}

float normalFiltering(float perceptualRoughness, const float3 worldNormal) {
    // Kaplanyan 2016, "Stable specular highlights"
    // Tokuyoshi 2017, "Error Reduction and Simplification for Shading Anti-Aliasing"
    // Tokuyoshi and Kaplanyan 2019, "Improved Geometric Specular Antialiasing"

    // This implementation is meant for deferred rendering in the original paper but
    // we use it in forward rendering as well (as discussed in Tokuyoshi and Kaplanyan
    // 2019). The main reason is that the forward version requires an expensive transform
    // of the half vector by the tangent frame for every light. This is therefore an
    // approximation but it works well enough for our needs and provides an improvement
    // over our original implementation based on Vlachos 2015, "Advanced VR Rendering".

    float3 du = ddx(worldNormal);
    float3 dv = ddy(worldNormal);

    float variance = _specularAntiAliasingVariance * (dot(du, du) + dot(dv, dv));

    float roughness = perceptualRoughnessToRoughness(perceptualRoughness);
    float kernelRoughness = min(2.0 * variance, _specularAntiAliasingThreshold);
    float squareRoughness = saturate(roughness * roughness + kernelRoughness);

    return roughnessToPerceptualRoughness(sqrt(squareRoughness));
}

float3 energyCompensation(float3 dfg, float3 f0)
{
  // Energy compensation for multiple scattering in a microfacet model
  // See "Multiple-Scattering Microfacet BSDFs with the Smith Model"
  return 1.0 + f0 * (1.0 / dfg.yyy - 1.0);
}

half3 Unity_GlossyEnvironment_local (UNITY_ARGS_TEXCUBE(tex), half4 hdr, Unity_GlossyEnvironmentData glossIn)
{
	half perceptualRoughness = glossIn.roughness /* perceptualRoughness */ ;

	// Workaround for issue where objects are blurrier than they should be
	// due to specular AA.
	float roughnessAdjustment = 1-perceptualRoughness;
	roughnessAdjustment = MIN_PERCEPTUAL_ROUGHNESS * roughnessAdjustment * roughnessAdjustment;
	perceptualRoughness = perceptualRoughness - roughnessAdjustment;

	// Unity derivation
	perceptualRoughness = perceptualRoughness*(1.7 - 0.7 * perceptualRoughness);
	// Filament derivation
	// perceptualRoughness = perceptualRoughness * (2.0 - perceptualRoughness);
	half mip = perceptualRoughnessToMipmapLevel(perceptualRoughness);
	half3 R = glossIn.reflUVW;
	half4 rgbm = UNITY_SAMPLE_TEXCUBE_LOD(tex, R, mip);

	return DecodeHDR(rgbm, hdr);
}

inline half3 UnityGI_prefilteredRadiance(const UnityGIInput data,
    const float perceptualRoughness, const float3 r) {
  half3 specular;

  Unity_GlossyEnvironmentData glossIn = (Unity_GlossyEnvironmentData)0;
  glossIn.roughness = perceptualRoughness;
  glossIn.reflUVW = r;

#ifdef UNITY_SPECCUBE_BOX_PROJECTION
  // we will tweak reflUVW in glossIn directly (as we pass it to Unity_GlossyEnvironment twice for probe0 and pr            obe1), so keep original to pass into BoxProjectedCubemapDirection
	half3 originalReflUVW = glossIn.reflUVW;
	glossIn.reflUVW = BoxProjectedCubemapDirection(originalReflUVW,
			data.worldPos, data.probePosition[0], data.boxMin[0], data.boxMax[0]);
#endif

#ifdef _GLOSSYREFLECTIONS_OFF
    specular = unity_IndirectSpecColor.rgb;
#else
  half3 env0 = Unity_GlossyEnvironment_local (UNITY_PASS_TEXCUBE(unity_SpecCube0), data.probeHDR[0], glossIn);
#ifdef UNITY_SPECCUBE_BLENDING
  const float kBlendFactor = 0.99999;
  float blendLerp = data.boxMin[0].w;
  UNITY_BRANCH
    if (blendLerp < kBlendFactor)
    {
#ifdef UNITY_SPECCUBE_BOX_PROJECTION
      glossIn.reflUVW = BoxProjectedCubemapDirection (originalReflUVW, data.worldPos, data.probePosition                        [1], data.boxMin[1], data.boxMax[1]);
#endif  // UNITY_SPECCUBE_BOX_PROJECTION

      half3 env1 = Unity_GlossyEnvironment_local (UNITY_PASS_TEXCUBE_SAMPLER(unity_SpecCube1,unity_SpecCube0                    ), data.probeHDR[1], glossIn);
      specular = lerp(env1, env0, blendLerp);                                                                           }
    else
    {
      specular = env0;
    }
#else
  specular = env0;
#endif  // UNITY_SPECCUBE_BLENDING
#endif  // _GLOSSYREFLECTIONS_OFF

  return specular;
}

// R dither mask
float noiseR2(float2 pixel) {
  const float a1 = 0.75487766624669276;
  const float a2 = 0.569840290998;
  return frac(a1 * float(pixel.x) + a2 * float(pixel.y));
}

// Return light probes or lightmap.
// Port of UnityGI_Irradiance without ShadingParams
float3 UnityGI_Irradiance(
    float3 worldNormal, 
    float3 worldPos,
    float4 lightmapUV,
    float3 ambient,
    float attenuation,
    float3 tangentNormal,
    float3x3 tangentToWorld,
    #if defined(USING_BAKERY_VERTEXLMSH)
        float3 ambientSH[3],
    #elif defined(USING_BAKERY_VERTEXLMDIR)
        float3 ambientDir,
    #endif
    out float occlusion, 
    out Light derivedLight)
{
    float3 irradiance = ambient;
    float3 irradianceForAO; 
    occlusion = 1.0;
    derivedLight = (Light)0;

    #if UNITY_SHOULD_SAMPLE_SH
        irradiance += Irradiance_SphericalHarmonicsUnity(worldNormal, ambient, worldPos, derivedLight);
    #endif

    irradianceForAO = irradiance;

    // Should be stripped out at compile time if vertex LM mode is disabled.
    if (getIsBakeryVertexMode() == false)
    {
    #if defined(LIGHTMAP_ON)
        // Baked lightmaps
        half4 bakedColorTex = SampleLightmapBicubic(lightmapUV.xy);
        half3 bakedColor = DecodeLightmap(bakedColorTex);

        #ifdef DIRLIGHTMAP_COMBINED
            fixed4 bakedDirTex = SampleLightmapDirBicubic(lightmapUV.xy);

            // Bakery's MonoSH mode replaces the regular directional lightmap
            #if defined(_BAKERY_MONOSH)
                irradiance = DecodeMonoSHLightmap(bakedColor, bakedDirTex, worldNormal, derivedLight);

                irradianceForAO = irradiance;

                #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                    irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                #endif
            #else
                irradiance = DecodeDirectionalLightmap(bakedColor, bakedDirTex, worldNormal);

                irradianceForAO = irradiance;

                #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                    irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                #endif

                #if defined(LIGHTMAP_SPECULAR) 
                    irradiance = DecodeDirectionalLightmapSpecular(bakedColor, bakedDirTex, worldNormal, false, 0, derivedLight);
                #endif
            #endif

        #else // not directional lightmap

            #if defined(USING_BAKERY)
                #if defined(_BAKERY_RNM)
                // bakery rnm mode
                irradiance = DecodeRNMLightmap(0, lightmapUV.xy, tangentNormal, tangentToWorld, derivedLight);
                #endif

                #if defined(_BAKERY_SH)
                // bakery sh mode
                irradiance = DecodeSHLightmap(bakedColor, lightmapUV.xy, worldNormal, derivedLight);
                #endif

                irradianceForAO = irradiance;

                #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                    irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                #endif

            #else

                irradiance += bakedColor;

                irradianceForAO = irradiance;

                #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                    irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                #endif
            #endif

        #endif
    #endif
    }

    #if defined(USING_BAKERY_VERTEXLM)
    if (getIsBakeryVertexMode() == true)
    {
        // Lightmap colour is already stored in ambient.
        // If directionality is on, then ambientDir contains directionality.
        // If SH is on, then ambientSH[3] contains the SH data.
        half4 bakedColorTex = float4(ambient, 1.0);

        #if defined(USING_BAKERY_VERTEXLMSH)
            irradiance = DecodeSHLightmapVertex(ambient, ambientSH, worldNormal, derivedLight);
            irradianceForAO = irradiance;
            #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
            #endif
        #else
            #if defined(USING_BAKERY_VERTEXLMDIR)
                #if defined(_BAKERY_MONOSH)
                    irradiance = DecodeMonoSHLightmap(ambient, ambientDir, worldNormal, derivedLight, false);
                    irradianceForAO = irradiance;
                    #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                        irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                    #endif
                #else
                    irradiance = DecodeDirectionalLightmap(ambient, ambientDir, worldNormal);
                    irradianceForAO = irradiance;
                    #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                        irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                    #endif
                    #if defined(LIGHTMAP_SPECULAR) 
                        irradiance = DecodeDirectionalLightmapSpecular(ambient, ambientDir, worldNormal, false, 0, derivedLight);
                    #endif
                #endif 
            #else
                // No directionality, just light colour.
                // Irradiance and IrradianceForAO already contain the irradiance, so just handle subtractive lighting. 
                #if defined(LIGHTMAP_SHADOW_MIXING) && !defined(SHADOWS_SHADOWMASK) && defined(SHADOWS_SCREEN)
                    irradiance = SubtractMainLightWithRealtimeAttenuationFromLightmap(irradiance, attenuation, bakedColorTex, worldNormal);
                #endif
            #endif
        #endif 
    }
    #endif

    #if defined(DYNAMICLIGHTMAP_ON)
        // Dynamic lightmaps
        fixed4 realtimeColorTex = SampleDynamicLightmapBicubic(lightmapUV.zw);
        half3 realtimeColor = DecodeRealtimeLightmap(realtimeColorTex);

        irradianceForAO += realtimeColor;

        #ifdef DIRLIGHTMAP_COMBINED
            half4 realtimeDirTex = SampleDynamicLightmapDirBicubic(lightmapUV.zw);
            irradiance += DecodeDirectionalLightmap(realtimeColor, realtimeDirTex, worldNormal);
        #else
            irradiance += realtimeColor;
        #endif
    #endif
    
    // VRC Light Volumes also have an additive component which can be added over lightmapping.
    #if defined(_VRCLV) && !UNITY_SHOULD_SAMPLE_SH
        Light volumeLight = (Light)0;
        irradiance += Irradiance_SampleVRCLightVolumeAdditive(worldNormal, worldPos, volumeLight);

        // Merge lights, weighing each light's contribution by their intensity
        float derivedLum = luminance(derivedLight.colorIntensity.rgb);
        float volumeLum = luminance(volumeLight.colorIntensity.rgb);
        float totalIntensity = derivedLum + volumeLum + FLT_EPS;
        float derivedWeight = derivedLum / totalIntensity;
        float volumeWeight = volumeLum / totalIntensity;

        derivedLight.l = normalize(derivedLight.l * derivedWeight + volumeLight.l * volumeWeight);
        derivedLight.colorIntensity = derivedLight.colorIntensity * derivedWeight + volumeLight.colorIntensity * volumeWeight;
        derivedLight.attenuation = derivedLight.attenuation * derivedWeight + volumeLight.attenuation * volumeWeight;
        derivedLight.NoL = derivedLight.NoL * derivedWeight + volumeLight.NoL * volumeWeight;
    #endif

    occlusion = IrradianceToExposureOcclusion(irradianceForAO);

    return irradiance;
}

// Simplified integration function using existing Unity/Bakery functions
float3 BakeryGI_Irradiance(
    float3 worldNormal,
    float3 worldPos,
    float4 lightmapUV,  // xy = uv0, zw = uv1
    float3 ambient,
    float attenuation,
    float3 tangentNormal,
    float3x3 tangentToWorld,
    out float occlusion,
    out Light derivedLight)
{
    // The existing UnityGI_Irradiance function already handles all Bakery modes correctly,
    // including MonoSH via the DecodeMonoSHLightmap function that's already defined above
    float3 ambientSH[3] = {float3(0,0,0), float3(0,0,0), float3(0,0,0)};
    float3 ambientDir = float3(0,0,0);
    
    return UnityGI_Irradiance(
        worldNormal,
        worldPos,
        lightmapUV,
        ambient,
        attenuation,
        tangentNormal,
        tangentToWorld,
        #if defined(USING_BAKERY_VERTEXLMSH)
            ambientSH,
        #elif defined(USING_BAKERY_VERTEXLMDIR)
            ambientDir,
        #endif
        occlusion,
        derivedLight
    );
}


#endif // __FILAMENTED_INC