// Copyright 2020 The Dawn Authors
//
// 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 "dawn/native/vulkan/QuerySetVk.h"

#include <algorithm>
#include <vector>

#include "dawn/native/vulkan/DeviceVk.h"
#include "dawn/native/vulkan/FencedDeleter.h"
#include "dawn/native/vulkan/UtilsVulkan.h"
#include "dawn/native/vulkan/VulkanError.h"
#include "dawn/platform/DawnPlatform.h"

namespace dawn::native::vulkan {

namespace {
VkQueryType VulkanQueryType(wgpu::QueryType type) {
    switch (type) {
        case wgpu::QueryType::Occlusion:
            return VK_QUERY_TYPE_OCCLUSION;
        case wgpu::QueryType::PipelineStatistics:
            return VK_QUERY_TYPE_PIPELINE_STATISTICS;
        case wgpu::QueryType::Timestamp:
            return VK_QUERY_TYPE_TIMESTAMP;
    }
    UNREACHABLE();
}

VkQueryPipelineStatisticFlags VulkanQueryPipelineStatisticFlags(
    std::vector<wgpu::PipelineStatisticName> pipelineStatisticsSet) {
    VkQueryPipelineStatisticFlags pipelineStatistics = 0;
    for (size_t i = 0; i < pipelineStatisticsSet.size(); ++i) {
        switch (pipelineStatisticsSet[i]) {
            case wgpu::PipelineStatisticName::ClipperInvocations:
                pipelineStatistics |= VK_QUERY_PIPELINE_STATISTIC_CLIPPING_INVOCATIONS_BIT;
                break;
            case wgpu::PipelineStatisticName::ClipperPrimitivesOut:
                pipelineStatistics |= VK_QUERY_PIPELINE_STATISTIC_CLIPPING_PRIMITIVES_BIT;
                break;
            case wgpu::PipelineStatisticName::ComputeShaderInvocations:
                pipelineStatistics |= VK_QUERY_PIPELINE_STATISTIC_COMPUTE_SHADER_INVOCATIONS_BIT;
                break;
            case wgpu::PipelineStatisticName::FragmentShaderInvocations:
                pipelineStatistics |= VK_QUERY_PIPELINE_STATISTIC_FRAGMENT_SHADER_INVOCATIONS_BIT;
                break;
            case wgpu::PipelineStatisticName::VertexShaderInvocations:
                pipelineStatistics |= VK_QUERY_PIPELINE_STATISTIC_VERTEX_SHADER_INVOCATIONS_BIT;
                break;
        }
    }

    return pipelineStatistics;
}
}  // anonymous namespace

// static
ResultOrError<Ref<QuerySet>> QuerySet::Create(Device* device,
                                              const QuerySetDescriptor* descriptor) {
    Ref<QuerySet> queryset = AcquireRef(new QuerySet(device, descriptor));
    DAWN_TRY(queryset->Initialize());
    return queryset;
}

MaybeError QuerySet::Initialize() {
    VkQueryPoolCreateInfo createInfo;
    createInfo.sType = VK_STRUCTURE_TYPE_QUERY_POOL_CREATE_INFO;
    createInfo.pNext = NULL;
    createInfo.flags = 0;
    createInfo.queryType = VulkanQueryType(GetQueryType());
    createInfo.queryCount = std::max(GetQueryCount(), uint32_t(1u));
    if (GetQueryType() == wgpu::QueryType::PipelineStatistics) {
        createInfo.pipelineStatistics = VulkanQueryPipelineStatisticFlags(GetPipelineStatistics());
    }

    Device* device = ToBackend(GetDevice());
    DAWN_TRY(CheckVkOOMThenSuccess(
        device->fn.CreateQueryPool(device->GetVkDevice(), &createInfo, nullptr, &*mHandle),
        "vkCreateQueryPool"));

    SetLabelImpl();

    return {};
}

VkQueryPool QuerySet::GetHandle() const {
    return mHandle;
}

QuerySet::~QuerySet() = default;

void QuerySet::DestroyImpl() {
    QuerySetBase::DestroyImpl();
    if (mHandle != VK_NULL_HANDLE) {
        ToBackend(GetDevice())->GetFencedDeleter()->DeleteWhenUnused(mHandle);
        mHandle = VK_NULL_HANDLE;
    }
}

void QuerySet::SetLabelImpl() {
    SetDebugName(ToBackend(GetDevice()), mHandle, "Dawn_QuerySet", GetLabel());
}

}  // namespace dawn::native::vulkan