StateStreamDefinitions.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "StateStreamHandle.h"
 
 
#define DECLARE_STATESTREAM(Type) \
    using StaticState = F##Type##StaticState; \
    using DynamicState = F##Type##DynamicState; \
    using Handle = F##Type##Handle; \
    static inline constexpr uint32 Id = Type##StateStreamId; \
 
 
// TODO: A struct with multiple times (wall, game, etc)
#if !defined(UE_STATESTREAM_TIME_TYPE)
#define UE_STATESTREAM_TIME_TYPE double
#endif
 
using StateStreamTime = UE_STATESTREAM_TIME_TYPE;
 
// Context used for interpolation functions
 
struct FStateStreamInterpolateContext : FStateStreamCopyContext
{
    double Factor = 0;
};
 
// Generic interpolation functions. Used by code generation
 
template<typename Type>
inline void StateStreamInterpolate(FStateStreamInterpolateContext& Context, Type& Out, const Type& From, const Type& To)
{
    Out = To;
}
 
 
inline void StateStreamInterpolate(FStateStreamInterpolateContext& Context, uint32& Out, const uint32& From, const uint32& To)
{
    Out = From + uint32(double(To - From)*Context.Factor);
}
 
inline void StateStreamInterpolate(FStateStreamInterpolateContext& Context, float& Out, const float& From, const float& To)
{
    Out = From + float(double(To - From)*Context.Factor);
}
 
inline void StateStreamInterpolate(FStateStreamInterpolateContext& Context, double& Out, const double& From, const double& To)
{
    Out = From + (To - From)*Context.Factor;
}
 
template<typename Type>
inline bool StateStreamEquals(const Type& A, const Type& B)
{
    return A == B;
}