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#include "../osd/cpuEvalLimitContext.h"
#include "../osd/vertexDescriptor.h"

#include <string.h>
#include <cassert>
#include <cstdio>
#include <cmath>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

OsdCpuEvalLimitContext *
OsdCpuEvalLimitContext::Create(FarMesh<OsdVertex> const * farmesh) {

    assert(farmesh);
    
    // we do not support uniform yet
    if (not farmesh->GetPatchTables())
        return NULL;
                                          
    return new OsdCpuEvalLimitContext(farmesh);
}

OsdCpuEvalLimitContext::OsdCpuEvalLimitContext(FarMesh<OsdVertex> const * farmesh) :
    OsdEvalLimitContext(farmesh) {
    
    FarPatchTables const * patchTables = farmesh->GetPatchTables();
    assert(patchTables);

    _patchMap = new OsdCpuEvalLimitContext::PatchMap( *patchTables );

    size_t  npatches = patchTables->GetNumPatches(),
           nvertices = patchTables->GetNumControlVertices();

    _patchArrays.reserve(npatches);

    _patchBitFields.reserve(npatches);
    
    _patchBuffer.reserve(nvertices);


    // Full regular patches
    _AppendPatchArray(OsdPatchDescriptor(kRegular, 0, 0, 0, 0),
                      patchTables->GetFullRegularPatches(),
                      patchTables->GetFullRegularPtexCoordinates());

    _AppendPatchArray(OsdPatchDescriptor(kBoundary, 0, 0, 0, 0),
                      patchTables->GetFullBoundaryPatches(),
                      patchTables->GetFullBoundaryPtexCoordinates());

    _AppendPatchArray(OsdPatchDescriptor(kCorner, 0, 0, 0, 0),
                      patchTables->GetFullCornerPatches(),
                      patchTables->GetFullCornerPtexCoordinates());

    _AppendPatchArray(OsdPatchDescriptor(kGregory, 0, 0, patchTables->GetMaxValence(), 0),
                      patchTables->GetFullGregoryPatches(),
                      patchTables->GetFullGregoryPtexCoordinates());

    _AppendPatchArray(OsdPatchDescriptor(kBoundaryGregory, 0, 0, patchTables->GetMaxValence(), 0),
                      patchTables->GetFullBoundaryGregoryPatches(),
                      patchTables->GetFullBoundaryGregoryPtexCoordinates());

    _vertexValenceBuffer = patchTables->GetVertexValenceTable();
    _quadOffsetBuffer = patchTables->GetQuadOffsetTable();

    // Transition patches
    for (int p=0; p<5; ++p) {
    
        _AppendPatchArray(OsdPatchDescriptor(kTransitionRegular, p, 0, 0, 0),
                          patchTables->GetTransitionRegularPatches(p),
                          patchTables->GetTransitionRegularPtexCoordinates(p));

        for (int r=0; r<4; ++r) {
            _AppendPatchArray(OsdPatchDescriptor(kTransitionBoundary, p, r, 0, 0),
                              patchTables->GetTransitionBoundaryPatches(p, r),
                              patchTables->GetTransitionBoundaryPtexCoordinates(p, r));

            _AppendPatchArray(OsdPatchDescriptor(kTransitionCorner, p, r, 0, 0),
                              patchTables->GetTransitionCornerPatches(p, r),
                              patchTables->GetTransitionCornerPtexCoordinates(p, r));
        }
    }

}

OsdCpuEvalLimitContext::~OsdCpuEvalLimitContext() {
    delete _patchMap;
}

int
OsdCpuEvalLimitContext::_AppendPatchArray(
    OsdPatchDescriptor const & desc,
    FarPatchTables::PTable const & pTable,
    FarPatchTables::PtexCoordinateTable const & ptxTable )
{
    if (pTable.first.empty() or ptxTable.empty())
        return 0;

    OsdPatchArray array;
    array.desc = desc;
    array.firstIndex = (int)_patchBuffer.size();
    array.numIndices = (int)pTable.first.size();
    array.gregoryQuadOffsetBase = 0;
    //array.gregoryVertexValenceBase = gregoryQuadOffsetBase;

    // copy patch array descriptor
    _patchArrays.push_back(array);
    
    // copy patches bitfields
    for (int i=0; i<(int)ptxTable.size(); ++i) {
        _patchBitFields.push_back( ptxTable[i].bitField );
    }

    // copy control vertices indices
    _patchBuffer.insert( _patchBuffer.end(), pTable.first.begin(), pTable.first.end());
    
    return 1;
}

} // end namespace OPENSUBDIV_VERSION
} // end namespace OpenSubdiv