o3de/Gems/SceneProcessing/Code/Source/Generation/Components/TangentGenerator/TangentGenerateComponent.h

/*
 * 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

#include <SceneAPI/SceneCore/Components/GenerationComponent.h>
#include <SceneAPI/SceneCore/Containers/Scene.h>
#include <SceneAPI/SceneData/Rules/TangentsRule.h>
#include <AzCore/RTTI/RTTI.h>

namespace AZ::SceneAPI::DataTypes { class IMeshData; }
namespace AZ::SceneAPI::DataTypes { class IMeshVertexUVData; }
namespace AZ::SceneAPI::DataTypes { class IMeshVertexTangentData; }
namespace AZ::SceneAPI::DataTypes { class IMeshVertexBitangentData; }
namespace AZ::SceneAPI::DataTypes { enum class TangentSpace; }
namespace AZ::SceneData::GraphData
{
    class BlendShapeData;
}

namespace AZ::SceneGenerationComponents
{
    struct TangentGenerateContext
        : public AZ::SceneAPI::Events::ICallContext
    {
        AZ_RTTI(TangentGenerateContext, "{E836F8F8-5A66-497C-89CC-2D37D741CCAA}", AZ::SceneAPI::Events::ICallContext)

        TangentGenerateContext(AZ::SceneAPI::Containers::Scene& scene)
            : m_scene(scene) {}
        TangentGenerateContext& operator=(const TangentGenerateContext& other) = delete;

        AZ::SceneAPI::Containers::Scene& GetScene() { return m_scene; }
        const AZ::SceneAPI::Containers::Scene& GetScene() const { return m_scene; }

    private:
        AZ::SceneAPI::Containers::Scene& m_scene;
    };


    class TangentGenerateComponent
        : public AZ::SceneAPI::SceneCore::GenerationComponent
    {
    public:
        AZ_COMPONENT(TangentGenerateComponent, "{57743E6F-8718-491C-8A82-24A6763904F5}", AZ::SceneAPI::SceneCore::GenerationComponent);

        TangentGenerateComponent();

        static void Reflect(AZ::ReflectContext* context);

        AZ::SceneAPI::Events::ProcessingResult GenerateTangentData(TangentGenerateContext& context);

    private:
        void FindBlendShapes(
            AZ::SceneAPI::Containers::SceneGraph& graph, const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex,
            AZStd::vector<AZ::SceneData::GraphData::BlendShapeData*>& outBlendShapes) const;
        bool GenerateTangentsForMesh(
            AZ::SceneAPI::Containers::Scene& scene,
            const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex,
            AZ::SceneAPI::DataTypes::IMeshData* meshData,
            AZ::SceneAPI::DataTypes::TangentGenerationMethod defaultGenerationMethod);
        bool UpdateFbxTangentWValues(
            AZ::SceneAPI::Containers::SceneGraph& graph,
            const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex,
            const AZ::SceneAPI::DataTypes::IMeshData* meshData,
            bool deubgBitangentFlip);
        const AZ::SceneAPI::SceneData::TangentsRule* GetTangentRule(const AZ::SceneAPI::Containers::Scene& scene) const;
        void GetRegistrySettings(
            AZ::SceneAPI::DataTypes::TangentGenerationMethod& defaultTangentGenrationMethod, bool& debugBitangentFlip) const;

        size_t CalcUvSetCount(AZ::SceneAPI::Containers::SceneGraph& graph, const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex) const;
        AZ::SceneAPI::DataTypes::IMeshVertexUVData* FindUvData(AZ::SceneAPI::Containers::SceneGraph& graph, const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex, AZ::u64 uvSet) const;

        AZ::SceneAPI::DataTypes::IMeshVertexTangentData* FindTangentData(AZ::SceneAPI::Containers::SceneGraph& graph, const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex, AZ::u64 setIndex) const;
        bool CreateTangentLayer(AZ::SceneAPI::Containers::SceneManifest& manifest,
            const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex,
            size_t numVerts,
            size_t uvSetIndex,
            AZ::SceneAPI::DataTypes::TangentGenerationMethod generationMethod,
            AZ::SceneAPI::Containers::SceneGraph& graph,
            AZ::SceneAPI::DataTypes::IMeshVertexTangentData** outTangentData);

        AZ::SceneAPI::DataTypes::IMeshVertexBitangentData* FindBitangentData(AZ::SceneAPI::Containers::SceneGraph& graph, const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex, AZ::u64 setIndex) const;
        bool CreateBitangentLayer(AZ::SceneAPI::Containers::SceneManifest& manifest,
            const AZ::SceneAPI::Containers::SceneGraph::NodeIndex& nodeIndex,
            size_t numVerts,
            size_t uvSetIndex,
            AZ::SceneAPI::DataTypes::TangentGenerationMethod generationMethod,
            AZ::SceneAPI::Containers::SceneGraph& graph,
            AZ::SceneAPI::DataTypes::IMeshVertexBitangentData** outBitangentData);
    };
} // namespace AZ::SceneGenerationComponents