StreamIn.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
JPH_NAMESPACE_BEGIN
 
class StreamIn
{
public:
    virtual             ~StreamIn() = default;
 
    virtual void        ReadBytes(void *outData, size_t inNumBytes) = 0;
 
    virtual bool        IsEOF() const = 0;
 
    virtual bool        IsFailed() const = 0;
 
    template <class T>
    void                Read(T &outT)
    {
        ReadBytes(&outT, sizeof(outT));
    }
    
    template <class T, class A>
    void                Read(std::vector<T, A> &outT)
    {
        typename Array<T>::size_type len = outT.size(); // Initialize to previous array size, this is used for validation in the StateRecorder class
        Read(len);
        if (!IsEOF() && !IsFailed())
        {
            outT.resize(len);
            for (typename Array<T>::size_type i = 0; i < len; ++i)
                Read(outT[i]);
        }
        else
            outT.clear();
    }
 
    template <class Type, class Traits, class Allocator>
    void                Read(std::basic_string<Type, Traits, Allocator> &outString)
    {
        typename std::basic_string<Type, Traits, Allocator>::size_type len = 0;
        Read(len);
        if (!IsEOF() && !IsFailed())
        {
            outString.resize(len);
            ReadBytes(outString.data(), len * sizeof(Type));
        }
        else
            outString.clear();
    }
 
    void                Read(Vec3 &outVec)
    {
        ReadBytes(&outVec, 3 * sizeof(float));
        outVec = Vec3::sFixW(outVec.mValue);
    }
 
    void                Read(DVec3 &outVec)
    {
        ReadBytes(&outVec, 3 * sizeof(double));
        outVec = DVec3::sFixW(outVec.mValue);
    }
 
    void                Read(DMat44 &outVec)
    {
        Vec4 x, y, z;
        Read(x);
        Read(y);
        Read(z);
 
        DVec3 t;
        Read(t);
 
        outVec = DMat44(x, y, z, t);
    }
};
 
JPH_NAMESPACE_END