/*
// 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 "lrn_kernel_ref.h"
#include "kernel_selector_utils.h" 

namespace kernel_selector 
{
    ParamsKey LRNKernelRef::GetSupportedKey() const
    {
        ParamsKey k;
        k.EnableInputDataType(Datatype::F16);
        k.EnableInputDataType(Datatype::F32);
        k.EnableOutputDataType(Datatype::F16);
        k.EnableOutputDataType(Datatype::F32);
        k.EnableInputLayout(DataLayout::bfyx);
        k.EnableInputLayout(DataLayout::yxfb);
        k.EnableInputLayout(DataLayout::byxf);
        k.EnableOutputLayout(DataLayout::bfyx);
        k.EnableOutputLayout(DataLayout::yxfb);
        k.EnableOutputLayout(DataLayout::byxf);
        k.EnableTensorOffset();
        k.EnableTensorPitches();
        k.EnableBatching();
        k.EnableLRNMode(LRNMode::WITHIN_CHANNEL);
        k.EnableLRNMode(LRNMode::ACROSS_CHANNEL);
        k.EnableLRNKernelDividerMode(KernelDividerMode::DYNAMIC);
        k.EnableLRNKernelDividerMode(KernelDividerMode::FIXED);
        return k;
    }

    JitConstants LRNKernelRef::GetJitConstants(const lrn_params& params, LRNKernelRef::Parent::DispatchData kd) const
    {
        const uint32_t round_norm_size = (params.localSize / 2) * 2 + 1;
        uint32_t numElement = round_norm_size * round_norm_size;

        if (params.normMode == LRNMode::ACROSS_CHANNEL)
        {
            numElement = round_norm_size;
        }

        const float num_element_div = 1.f / (float)numElement;

        JitConstants jit = Parent::GetJitConstants(params, kd);
        jit.AddConstants({
            MakeJitConstant("NUM_ELEMENTS_DIV", num_element_div),
            MakeJitConstant("GWS_BATCH", 2),
            MakeJitConstant("GWS_FEATURE", 1),
            MakeJitConstant("GWS_YX", 0),
        });

        return jit;
    }

    LRNKernelRef::Parent::DispatchData LRNKernelRef::SetDefault(const lrn_params& params) const
    {
        DispatchData kd = Parent::SetDefault(params);

        const auto& out = params.output;
        
        std::vector<size_t> global = { out.X().v*out.Y().v, out.Feature().v, out.Batch().v };
        auto local  = GetOptimalLocalWorkGroupSizes(global);

        kd.gws0 = global[0];
        kd.gws1 = global[1];
        kd.gws2 = global[2];

        kd.lws0 = local[0];
        kd.lws1 = local[1];
        kd.lws2 = local[2];

        return kd;
    }

    KernelsData LRNKernelRef::GetKernelsData(const Params& params, const optional_params& options) const
    {
        return GetCommonKernelsData(params, options, DONT_USE_IF_HAVE_SOMETHING_ELSE);
    }
}