o3de/Gems/Atom/Feature/Common/Assets/Shaders/Materials/StandardMultilayerPBR/StandardMultilayerPBR_PixelGeometryEval.azsli

/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#pragma once

#ifndef EvaluatePixelGeometry
#define EvaluatePixelGeometry EvaluatePixelGeometry_StandardMultilayerPBR
#endif

#include <Atom/Feature/Common/Assets/Shaders/Materials/BasePBR/BasePBR_PixelGeometryEval.azsli>

PixelGeometryData EvaluatePixelGeometry_StandardMultilayerPBR(
    VsSystemValues SV,
    const MaterialParameters params,
    inout float4 positionSV,
    float3 positionWS,
    real3 normalWS,
    real3 tangentWS,
    real3 bitangentWS,
    float2 uvs[UvSetCount],
    bool isFrontFace,
    real4x4 objectToWorld,
    real3 vertexBlendMask)
{
    PixelGeometryData geoData = EvaluatePixelGeometry_BasePBR(SV, params, positionWS, normalWS, tangentWS, bitangentWS, uvs, isFrontFace);
    geoData.isDisplacementClipped = false;
    geoData.m_vertexBlendMask = vertexBlendMask;

#if ENABLE_PARALLAX
    if(ShouldHandleParallax())
    {
        MultilayerSetPixelDepth(params, vertexBlendMask, geoData.positionWS, geoData.vertexNormal, geoData.tangents, geoData.bitangents,
            geoData.uvs, isFrontFace, objectToWorld, positionSV.z, positionSV.w, geoData.isDisplacementClipped);
    }
#endif
    return geoData;
}

PixelGeometryData EvaluatePixelGeometry_StandardMultilayerPBR(inout VsOutput IN, VsSystemValues SV, bool isFrontFace, const MaterialParameters params)
{
    real4x4 objectToWorld = real4x4(GetObjectToWorldMatrix(SV));
    real3x3 objectToWorldIT = real3x3(GetObjectToWorldMatrixInverseTranspose(SV));
    
    real3 normalWS, tangentWS, bitangentWS;
    ConstructTBN(real3(IN.normal), real4(IN.tangent), objectToWorld, objectToWorldIT, normalWS, tangentWS, bitangentWS);
    
    return EvaluatePixelGeometry_StandardMultilayerPBR(
        SV,
        params,
        IN.position,
        IN.worldPosition,
        normalWS,
        tangentWS,
        bitangentWS,
        IN.uvs,
        isFrontFace,
        objectToWorld,
        real3(IN.blendFactors.xyz));
}