//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef USD_INTERPOLATION_H
#define USD_INTERPOLATION_H

/// \file usd/interpolation.h

#include "pxr/pxr.h"
#include "pxr/usd/usd/api.h"
#include "pxr/base/vt/array.h"
#include "pxr/base/gf/declare.h"

#include <boost/preprocessor/seq/for_each.hpp>

PXR_NAMESPACE_OPEN_SCOPE


/// \enum UsdInterpolationType
///
/// Attribute value interpolation options. 
///
/// See \ref Usd_AttributeInterpolation for more details.
///
enum UsdInterpolationType
{
    UsdInterpolationTypeHeld,  ///< Held interpolation
    UsdInterpolationTypeLinear ///< Linear interpolation
};

/// Sequence of value types that support linear interpolation.
/// These types and VtArrays of these types are supported:
/// \li <b>GfHalf</b>
/// \li <b>float</b>
/// \li <b>double</b>
/// \li <b>GfMatrix2d</b>
/// \li <b>GfMatrix3d</b>
/// \li <b>GfMatrix4d</b>
/// \li <b>GfVec2d</b>
/// \li <b>GfVec2f</b>
/// \li <b>GfVec2h</b>
/// \li <b>GfVec3d</b>
/// \li <b>GfVec3f</b>
/// \li <b>GfVec3h</b>
/// \li <b>GfVec4d</b>
/// \li <b>GfVec4f</b>
/// \li <b>GfVec4h</b>
/// \li <b>GfQuatd</b> (via quaternion slerp)
/// \li <b>GfQuatf</b> (via quaternion slerp)
/// \li <b>GfQuath</b> (via quaternion slerp)
/// \hideinitializer
#define USD_LINEAR_INTERPOLATION_TYPES               \
    (GfHalf) (VtArray<GfHalf>)                       \
    (float) (VtArray<float>)                         \
    (double) (VtArray<double>)                       \
    (GfMatrix2d) (VtArray<GfMatrix2d>)               \
    (GfMatrix3d) (VtArray<GfMatrix3d>)               \
    (GfMatrix4d) (VtArray<GfMatrix4d>)               \
    (GfVec2d) (VtArray<GfVec2d>)                     \
    (GfVec2f) (VtArray<GfVec2f>)                     \
    (GfVec2h) (VtArray<GfVec2h>)                     \
    (GfVec3d) (VtArray<GfVec3d>)                     \
    (GfVec3f) (VtArray<GfVec3f>)                     \
    (GfVec3h) (VtArray<GfVec3h>)                     \
    (GfVec4d) (VtArray<GfVec4d>)                     \
    (GfVec4f) (VtArray<GfVec4f>)                     \
    (GfVec4h) (VtArray<GfVec4h>)                     \
    (GfQuatd) (VtArray<GfQuatd>)                     \
    (GfQuatf) (VtArray<GfQuatf>)                     \
    (GfQuath) (VtArray<GfQuath>)

/// \struct UsdLinearInterpolationTraits
///
/// Traits class describing whether a particular C++ value type
/// supports linear interpolation.
///
/// UsdLinearInterpolationTraits<T>::isSupported will be true for all
/// types listed in the USD_LINEAR_INTERPOLATION_TYPES sequence.
template <class T>
struct UsdLinearInterpolationTraits
{
    static const bool isSupported = false;
};

/// \cond INTERNAL
#define _USD_DECLARE_INTERPOLATION_TRAITS(r, unused, type)       \
template <>                                                     \
struct UsdLinearInterpolationTraits<type>                       \
{                                                               \
    static const bool isSupported = true;                       \
};

BOOST_PP_SEQ_FOR_EACH(_USD_DECLARE_INTERPOLATION_TRAITS, ~, 
                      USD_LINEAR_INTERPOLATION_TYPES)

#undef _USD_DECLARE_INTERPOLATION_TRAITS
/// \endcond


PXR_NAMESPACE_CLOSE_SCOPE

#endif // USD_INTERPOLATION_H
