// Copyright (c) 2016 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


#include "pooling_kernel_gpu_average_opt.h"

namespace kernel_selector {
ParamsKey PoolingKernelGPUAverageOpt::GetSupportedKey() const {
    ParamsKey k;
    k.EnableInputDataType(Datatype::F32);
    k.EnableOutputDataType(Datatype::F32);
    k.EnableInputLayout(DataLayout::bfyx);
    k.EnableOutputLayout(DataLayout::bfyx);
    k.EnablePoolType(PoolType::AVG);
    k.EnablePoolRemainder(PoolRemainder::FLOOR);
    k.EnablePoolRemainder(PoolRemainder::CEIL);
    k.EnablePoolKernelDividerMode(KernelDividerMode::FIXED);
    return k;
}

bool PoolingKernelGPUAverageOpt::Validate(const Params& p, const optional_params& o) const {
    if (!PoolingKernelBase::Validate(p, o)) {
        return false;
    }

    const pooling_params& params = static_cast<const pooling_params&>(p);

    if (!params.activations.empty()) {
        return {};
    }

    if ((params.poolSize.x != 3) || (params.poolSize.y != 3) || (params.poolStride.x != 1) ||
        (params.poolStride.y != 1) || (params.poolPad.x != 1) || (params.poolPad.y != 1) ||
        !(params.inputs[0] == params.output) || params.inputs[0].PitchesDifferFromLogicalDims() ||
        params.output.PitchesDifferFromLogicalDims()) {
        return false;
    }

    return true;
}

static uSize GetTileDimentions() {
    constexpr int simdSize = 16;

    return {simdSize - 2, 7};
}

PoolingKernelBase::DispatchData PoolingKernelGPUAverageOpt::SetDefault(const pooling_params& params) const {
    constexpr int simdSize = 16;

    DispatchData runInfo = PoolingKernelBase::SetDefault(params);

    auto tileDims = GetTileDimentions();

    const int numTilesX =
        static_cast<int>(std::ceil(static_cast<float>(params.inputs[0].X().v) / static_cast<float>(tileDims.x)));
    const int numTilesY =
        static_cast<int>(std::ceil(static_cast<float>(params.inputs[0].Y().v) / static_cast<float>(tileDims.y)));

    runInfo.gws0 = numTilesX * simdSize;
    runInfo.gws1 = numTilesY;
    runInfo.gws2 = params.inputs[0].Feature().v;
    runInfo.lws0 = simdSize;
    runInfo.lws1 = 1;
    runInfo.lws2 = 1;

    return runInfo;
}

JitConstants PoolingKernelGPUAverageOpt::GetJitConstants(const pooling_params& params, DispatchData kd) const {
    auto tileDims = GetTileDimentions();
    auto mem_consts = PoolingKernelBase::GetJitConstants(params, kd);

    if (tileDims.y != 0 && tileDims.x != 0) {
        mem_consts.AddConstant(MakeJitConstant("SUB_GROUP_SIZE", kd.lws0));
        mem_consts.AddConstant(MakeJitConstant("TILE_HEIGHT", tileDims.y));
        mem_consts.AddConstant(MakeJitConstant("TILE_WIDTH", tileDims.x));
        mem_consts.AddConstant(MakeJitConstant("ONE_OVER_POOL_SIZE", 1.f / (params.poolSize.x * params.poolSize.y)));
    }

    return mem_consts;
}

KernelsData PoolingKernelGPUAverageOpt::GetKernelsData(const Params& params, const optional_params& options) const {
    return GetCommonKernelsData(params, options, FORCE_PRIORITY_7);
}
}  // namespace kernel_selector