/*
 * Copyright (c) 2019-2020, NVIDIA CORPORATION.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the NVIDIA CORPORATION nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "maskGenerator.h"

/******************************************************************************
 * CONSTANTS ******************************************************************
 *****************************************************************************/

namespace
{

constexpr const int BLOCK_SIZE = 512;
}

/******************************************************************************
 * KERNELS ********************************************************************
 *****************************************************************************/

__global__ void generateMaskKernel(const int32_t* const lengthsDevice, const int maskLength, float* const maskDevice)
{
    const int length = lengthsDevice[blockIdx.x];
    for (int i = threadIdx.x; i < maskLength; i += blockDim.x)
    {
        maskDevice[maskLength * blockIdx.x + i] = static_cast<float>(i < length);
    }
}

/******************************************************************************
 * PUBLIC METHODS *************************************************************
 *****************************************************************************/

namespace tts
{

void MaskGenerator::generate(const int32_t* const lengthsDevice, const int maskLength, const int batchSize,
    float* const maskDevice, cudaStream_t stream)
{

    const dim3 grid(batchSize);
    const dim3 block(BLOCK_SIZE);

    generateMaskKernel<<<grid, block, 0, stream>>>(lengthsDevice, maskLength, maskDevice);
}

} // namespace tts
