o3de/Code/Tools/RC/ResourceCompilerABC/GeomCache.h

/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/
// Original file Copyright Crytek GMBH or its affiliates, used under license.

#pragma once


#include "GeomCacheFileFormat.h"

#include <Alembic/AbcGeom/IPolyMesh.h>  // for Alembic::AbcGeom::IPolyMesh
#include <Alembic/AbcGeom/IXform.h>     // for Alembic::AbcGeom::IXform

#include <primitives.h>
#include <physinterface.h>

#include <AzCore/std/parallel/atomic.h>
#include <AzCore/std/parallel/mutex.h>

#include <unordered_set>

namespace GeomCache
{
    struct MeshData
    {
        std::vector<GeomCacheFile::Position> m_positions;
        std::vector<GeomCacheFile::Texcoords> m_texcoords;
        std::vector<GeomCacheFile::QTangent> m_qTangents;
        std::vector<GeomCacheFile::Color> m_reds;
        std::vector<GeomCacheFile::Color> m_greens;
        std::vector<GeomCacheFile::Color> m_blues;
        std::vector<GeomCacheFile::Color> m_alphas;
    };

    struct RawMeshFrame
    {
        RawMeshFrame()
            : m_bDone(false)
            , m_bEncoded(false) {}

        RawMeshFrame(RawMeshFrame&& toBeCopied)
            : m_bDone(toBeCopied.m_bDone)
            , m_bEncoded(toBeCopied.m_bEncoded)
            , m_meshData(std::move(toBeCopied.m_meshData))
        {
            m_frameUseCount.store(toBeCopied.m_frameUseCount);
        }

        bool m_bDone;
        bool m_bEncoded;
        AZStd::atomic_int m_frameUseCount;
        MeshData m_meshData;
    };

    // Data stored for each mesh
    struct Mesh
    {
        Mesh()
            : m_bUsePredictor(false)
            , m_firstRawFrameIndex(0) {}

        // Variance
        GeomCacheFile::EStreams m_constantStreams;
        GeomCacheFile::EStreams m_animatedStreams;

        // Mesh hash
        uint64 m_hash;

        // Static mesh AABB
        AABB m_aabb;

        // The number of required position quantization bits for each axis
        uint8 m_positionPrecision[3];

        // The abs value of the upper limit of the UV range
        float m_uvMax;

        // Static mesh data
        MeshData m_staticMeshData;

        // Compile buffer 
        RawMeshFrame m_meshDataBuffer;

        // Raw animated data frames for encoder
        mutable AZStd::mutex m_rawFramesCS;
        uint m_firstRawFrameIndex;
        std::deque<RawMeshFrame> m_rawFrames;

        // Encoded animated data frames for writer
        mutable AZStd::mutex m_encodedFramesCS;
        std::deque<std::vector<uint8> > m_encodedFrames;

        // Material ID -> material indices. Needs to be std::map, because materials need to be sorted by their id.
        std::map<uint16, std::vector<uint32> > m_indicesMap;

        // Face ID -> Material ID
        std::unordered_map<uint32, uint16> m_materialIdMap;

        // Predictor data
        std::vector<uint16> m_predictorData;
        bool m_bUsePredictor;

        // Compilation data
        bool m_bHasNormals;
        bool m_bHasTexcoords;
        bool m_bHasColors;
        std::string m_colorParamName;
        std::vector<uint32> m_abcIndexToGeomCacheIndex; // map from alembic indices to GPU indices
        Alembic::AbcGeom::IPolyMesh m_abcMesh; // The alembic poly mesh this originated from
        std::vector<bool> m_reflections;
    };

    struct NodeData
    {
        bool m_bVisible;
        QuatTNS m_transform;
    };

    // A node in the cache transform hierarchy.
    // Can be a plain parent transform, a transform and mesh combined
    // or a transform and a physics geometry combined.
    struct Node
    {
        Node()
            : m_type(GeomCacheFile::eNodeType_Transform)
            , m_transformType(GeomCacheFile::eTransformType_Constant) {}

        // Node type
        GeomCacheFile::ENodeType m_type;

        // Transform type
        GeomCacheFile::ETransformType m_transformType;

        // Static node data
        NodeData m_staticNodeData;

        // Compile buffer
        NodeData m_nodeDataBuffer;

        // Animated data frames for encoder
        std::deque<NodeData> m_animatedNodeData;

        // Encoded animated data frames for writer
        mutable AZStd::mutex m_encodedFramesCS;
        std::deque<std::vector<uint8> > m_encodedFrames;

        // Mesh (if mesh node)
        std::shared_ptr<Mesh> m_pMesh;

        // Serialized physics geometry (if physics geometry node)
        std::vector<char> m_physicsGeometry;

        // Children
        std::vector<std::unique_ptr<Node> > m_children;

        // The alembic object
        Alembic::Abc::IObject m_abcObject;

        // The alembic xform stack for this node that will be merged down to one
        // transform matrix in the compilation process
        std::vector<Alembic::AbcGeom::IXform> m_abcXForms;

        // For debug output
        string m_name;
    };
}