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#pragma once
#include "Runtime/mecanim/defs.h"
#include "Runtime/Serialize/Blobification/offsetptr.h"
namespace mecanim
{
namespace animation
{
// StreamedClip is a stream oriented clip format.
// It stores hermite coefficients directly. Multiple curves are stored in the same stream. Keys for all curves are sorted by time.
// This drastically reduces cache misses. In the best case we can sample a clip with a single cache miss. Clip data is read completely linearly.
// Instead of laying out the animationclip by curves containing any array of keys.
// We sort all keys of all curves by time and each key has an index.
// This is a streamed format basically CurveTimeData defines the time value and the number of keys at this time.
// Then CurveTimeData.count CurveKey elements will follow.
// time = 0
// CurveTimeData(4) ... CurveKey . CurveKey . CurveKey . CurveKey
// time = 0.2
// CurveTimeData(1) ... CurveKey
// Sampling is separated into two functions.
// 1. Seeking, it is responsible for updating the cached in the StreamedClipMemory to ensure each curve Index has an up to date time and hermite cofficients.
// 2. Evaluating the caches. This simply evaluates the hermite caches
// See StreamedClipBuilder.cpp and AnimationClip.cpp on how to build the streamed clip data.
struct StreamedCacheItem
{
float time;
float coeff[4];
};
struct StreamedClipMemory
{
StreamedCacheItem* caches;
int cacheCount;
float time;
UInt32 readByteOffset;
};
struct StreamedClip
{
uint32_t dataSize;
OffsetPtr<uint32_t> data;
UInt32 curveCount;
StreamedClip () : curveCount (0),dataSize(0) { }
DEFINE_GET_TYPESTRING(StreamedClip)
template<class TransferFunction>
inline void Transfer (TransferFunction& transfer)
{
TRANSFER_BLOB_ONLY(dataSize);
MANUAL_ARRAY_TRANSFER2(uint32_t, data, dataSize);
TRANSFER(curveCount);
}
};
struct CurveTimeData
{
float time;
UInt32 count;
// This is implicitly followed by CurveKey in the stream
};
struct CurveKey
{
int curveIndex;
float coeff[4];
};
// Sample functions
void SampleClip (const StreamedClip& curveData, StreamedClipMemory& cache, float time, float* output);
float SampleClipAtIndex (const StreamedClip& curveData, StreamedClipMemory& cache, int index, float time);
// Creation & Destruction
// StreamedClipBuilder.h actually creates the streamed clip from an array of AnimationCurve.
void CreateStreamedClipMemory (const StreamedClip& clip, StreamedClipMemory& memory, memory::Allocator& alloc);
void DestroyStreamedClipMemory (StreamedClipMemory& memory, memory::Allocator& alloc);
void DestroyStreamedClip (StreamedClip& clip, memory::Allocator& alloc);
}
}
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