blendShapeData.h

//
// Copyright 2025 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_IMAGING_USD_SKEL_IMAGING_BLEND_SHAPE_DATA_H
#define PXR_USD_IMAGING_USD_SKEL_IMAGING_BLEND_SHAPE_DATA_H
 
#include "pxr/usdImaging/usdSkelImaging/api.h"
 
#include "pxr/usd/sdf/path.h"
 
#include "pxr/base/vt/array.h"
 
#include "pxr/base/tf/declarePtrs.h"
 
#include <map>
 
PXR_NAMESPACE_OPEN_SCOPE
 
TF_DECLARE_REF_PTRS(HdSceneIndexBase);
 
struct UsdSkelImagingWeightAndSubShapeIndex
{
    float weight;
 
    int subShapeIndex;
};
 
using UsdSkelImagingWeightsAndSubShapeIndices =
    std::vector<UsdSkelImagingWeightAndSubShapeIndex>;
 
struct UsdSkelImagingBlendShapeData
{
    SdfPath primPath;
 
    VtArray<GfVec4f> blendShapeOffsets;
    VtArray<GfVec2i> blendShapeOffsetRanges;
 
    size_t numSubShapes;
 
    std::map<TfToken, UsdSkelImagingWeightsAndSubShapeIndices>
        blendShapeNameToWeightsAndSubShapeIndices;
};
 
USDSKELIMAGING_API
UsdSkelImagingBlendShapeData
UsdSkelImagingComputeBlendShapeData(
    HdSceneIndexBaseRefPtr const &sceneIndex,
    const SdfPath &primPath);
 
USDSKELIMAGING_API
VtArray<float>
UsdSkelImagingComputeBlendShapeWeights(
    const UsdSkelImagingBlendShapeData &data,
    // from skel animation
    const VtArray<TfToken> &blendShapeNames,
    // from skel animation
    const VtArray<float> &blendShapeWeights);
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif