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#include "../far/mesh.h"
#include "../osd/cudaComputeContext.h"

#include <cuda_runtime.h>

namespace OpenSubdiv {
namespace OPENSUBDIV_VERSION {

void
OsdCudaTable::createCudaBuffer(size_t size, const void *ptr) {
    cudaMalloc(&_devicePtr, size);
    cudaMemcpy(_devicePtr, ptr, size, cudaMemcpyHostToDevice);
}

OsdCudaTable::~OsdCudaTable() {

    if (_devicePtr) cudaFree(_devicePtr);
}

void *
OsdCudaTable::GetCudaMemory() const {

    return _devicePtr;
}

// ----------------------------------------------------------------------------

OsdCudaHEditTable::OsdCudaHEditTable(
    const FarVertexEditTables<OsdVertex>::VertexEditBatch &batch)
    : _primvarIndicesTable(new OsdCudaTable(batch.GetVertexIndices())),
      _editValuesTable(new OsdCudaTable(batch.GetValues())) {

    _operation = batch.GetOperation();
    _primvarOffset = batch.GetPrimvarIndex();
    _primvarWidth = batch.GetPrimvarWidth();
}

OsdCudaHEditTable::~OsdCudaHEditTable() {

    delete _primvarIndicesTable;
    delete _editValuesTable;
}

const OsdCudaTable *
OsdCudaHEditTable::GetPrimvarIndices() const {

    return _primvarIndicesTable;
}

const OsdCudaTable *
OsdCudaHEditTable::GetEditValues() const {

    return _editValuesTable;
}

int
OsdCudaHEditTable::GetOperation() const {

    return _operation;
}

int
OsdCudaHEditTable::GetPrimvarOffset() const {

    return _primvarOffset;
}

int
OsdCudaHEditTable::GetPrimvarWidth() const {

    return _primvarWidth;
}

OsdCudaComputeContext::OsdCudaComputeContext(FarMesh<OsdVertex> *farMesh) {

    FarSubdivisionTables<OsdVertex> const * farTables =
        farMesh->GetSubdivisionTables();

    // allocate 5 or 7 tables
    _tables.resize(farTables->GetNumTables(), 0);

    _tables[FarSubdivisionTables<OsdVertex>::E_IT]  = new OsdCudaTable(farTables->Get_E_IT());
    _tables[FarSubdivisionTables<OsdVertex>::V_IT]  = new OsdCudaTable(farTables->Get_V_IT());
    _tables[FarSubdivisionTables<OsdVertex>::V_ITa] = new OsdCudaTable(farTables->Get_V_ITa());
    _tables[FarSubdivisionTables<OsdVertex>::E_W]   = new OsdCudaTable(farTables->Get_E_W());
    _tables[FarSubdivisionTables<OsdVertex>::V_W]   = new OsdCudaTable(farTables->Get_V_W());

    if (farTables->GetNumTables() > 5) {
        _tables[FarSubdivisionTables<OsdVertex>::F_IT]  = new OsdCudaTable(farTables->Get_F_IT());
        _tables[FarSubdivisionTables<OsdVertex>::F_ITa] = new OsdCudaTable(farTables->Get_F_ITa());
    }

    // create hedit tables
    FarVertexEditTables<OsdVertex> const *editTables = farMesh->GetVertexEdit();
    if (editTables) {
        int numEditBatches = editTables->GetNumBatches();
        _editTables.reserve(numEditBatches);
        for (int i = 0; i < numEditBatches; ++i) {
            const FarVertexEditTables<OsdVertex>::VertexEditBatch & edit =
                editTables->GetBatch(i);

            _editTables.push_back(new OsdCudaHEditTable(edit));
        }
    }
}

OsdCudaComputeContext::~OsdCudaComputeContext() {

    for (size_t i = 0; i < _tables.size(); ++i) {
        delete _tables[i];
    }
    for (size_t i = 0; i < _editTables.size(); ++i) {
        delete _editTables[i];
    }
}

const OsdCudaTable *
OsdCudaComputeContext::GetTable(int tableIndex) const {

    return _tables[tableIndex];
}

int
OsdCudaComputeContext::GetNumEditTables() const {

    return static_cast<int>(_editTables.size());
}

const OsdCudaHEditTable *
OsdCudaComputeContext::GetEditTable(int tableIndex) const {

    return _editTables[tableIndex];
}

float *
OsdCudaComputeContext::GetCurrentVertexBuffer() const {

    return _currentVertexBuffer;
}

float *
OsdCudaComputeContext::GetCurrentVaryingBuffer() const {

    return _currentVaryingBuffer;
}

int
OsdCudaComputeContext::GetCurrentVertexNumElements() const {

    return _numVertexElements;
}

int
OsdCudaComputeContext::GetCurrentVaryingNumElements() const {

    return _numVaryingElements;
}

OsdCudaComputeContext *
OsdCudaComputeContext::Create(FarMesh<OsdVertex> *farmesh) {

    return new OsdCudaComputeContext(farmesh);
}

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