//
// 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.
//
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/basisCurvesTopology.h"
#include "pxr/imaging/hdSt/basisCurvesComputations.h"

#include "pxr/imaging/hd/vtBufferSource.h"

PXR_NAMESPACE_OPEN_SCOPE



// static
HdSt_BasisCurvesTopologySharedPtr
HdSt_BasisCurvesTopology::New(const HdBasisCurvesTopology &src)
{
    return HdSt_BasisCurvesTopologySharedPtr(new HdSt_BasisCurvesTopology(src));
}

// explicit
HdSt_BasisCurvesTopology::HdSt_BasisCurvesTopology(const HdBasisCurvesTopology& src)
 : HdBasisCurvesTopology(src)
{
}


HdSt_BasisCurvesTopology::~HdSt_BasisCurvesTopology()
{
}

HdBufferSourceSharedPtr
HdSt_BasisCurvesTopology::GetPointsIndexBuilderComputation()
{
    // This is simple enough to return the result right away, instead of
    // using a computed buffer source.
    const VtIntArray& vertexCounts = GetCurveVertexCounts();
    int numVerts = 0;
    std::vector<int> indices;
    for (int count : vertexCounts) {
        numVerts += count;
    }

    int vi = 0;
    while (vi < numVerts) {
        indices.emplace_back(vi++);
    }

    VtIntArray finalIndices(indices.size());
    const VtIntArray& curveIndices = GetCurveIndices();
    if (curveIndices.empty()) {
        std::copy(indices.begin(), indices.end(), finalIndices.begin());
    } else {
        // If have topology has indices set, map the generated indices
        // with the given indices.
        int maxIndex = curveIndices.size() - 1;
        for (const int& index : indices) {
            finalIndices[index] = std::min(curveIndices[index], maxIndex);
        }
    }

    // Note: The primitive param buffer isn't bound.
    return HdBufferSourceSharedPtr(
        new HdVtBufferSource(HdTokens->indices, VtValue(finalIndices)));
}

HdBufferSourceSharedPtr
HdSt_BasisCurvesTopology::GetIndexBuilderComputation(bool forceLines)
{
    return HdBufferSourceSharedPtr(
        new HdSt_BasisCurvesIndexBuilderComputation(this, forceLines));
}

PXR_NAMESPACE_CLOSE_SCOPE