// Copyright 2019 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 <utility>

#include "dawn/native/vulkan/AdapterVk.h"
#include "dawn/native/vulkan/BackendVk.h"
#include "dawn/native/vulkan/DeviceVk.h"
#include "dawn/native/vulkan/VulkanError.h"
#include "dawn/native/vulkan/external_semaphore/SemaphoreService.h"

static constexpr VkExternalSemaphoreHandleTypeFlagBits kHandleType =
#if defined(DAWN_USE_SYNC_FDS)
    VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_SYNC_FD_BIT;
#else
    VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD_BIT_KHR;
#endif  // defined(DAWN_USE_SYNC_FDS)

namespace dawn::native::vulkan::external_semaphore {

Service::Service(Device* device)
    : mDevice(device),
      mSupported(CheckSupport(device->GetDeviceInfo(),
                              ToBackend(device->GetAdapter())->GetPhysicalDevice(),
                              device->fn)) {}

Service::~Service() = default;

// static
bool Service::CheckSupport(const VulkanDeviceInfo& deviceInfo,
                           VkPhysicalDevice physicalDevice,
                           const VulkanFunctions& fn) {
    if (!deviceInfo.HasExt(DeviceExt::ExternalSemaphoreFD)) {
        return false;
    }

    VkPhysicalDeviceExternalSemaphoreInfoKHR semaphoreInfo;
    semaphoreInfo.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_EXTERNAL_SEMAPHORE_INFO_KHR;
    semaphoreInfo.pNext = nullptr;
    semaphoreInfo.handleType = kHandleType;

    VkExternalSemaphorePropertiesKHR semaphoreProperties;
    semaphoreProperties.sType = VK_STRUCTURE_TYPE_EXTERNAL_SEMAPHORE_PROPERTIES_KHR;
    semaphoreProperties.pNext = nullptr;

    fn.GetPhysicalDeviceExternalSemaphoreProperties(physicalDevice, &semaphoreInfo,
                                                    &semaphoreProperties);

    VkFlags requiredFlags = VK_EXTERNAL_SEMAPHORE_FEATURE_EXPORTABLE_BIT_KHR |
                            VK_EXTERNAL_SEMAPHORE_FEATURE_IMPORTABLE_BIT_KHR;

    return IsSubset(requiredFlags, semaphoreProperties.externalSemaphoreFeatures);
}

bool Service::Supported() {
    return mSupported;
}

ResultOrError<VkSemaphore> Service::ImportSemaphore(ExternalSemaphoreHandle handle) {
    DAWN_INVALID_IF(handle < 0, "Importing a semaphore with an invalid handle.");

    VkSemaphore semaphore = VK_NULL_HANDLE;
    VkSemaphoreCreateInfo info;
    info.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
    info.pNext = nullptr;
    info.flags = 0;

    DAWN_TRY(CheckVkSuccess(
        mDevice->fn.CreateSemaphore(mDevice->GetVkDevice(), &info, nullptr, &*semaphore),
        "vkCreateSemaphore"));

    VkImportSemaphoreFdInfoKHR importSemaphoreFdInfo;
    importSemaphoreFdInfo.sType = VK_STRUCTURE_TYPE_IMPORT_SEMAPHORE_FD_INFO_KHR;
    importSemaphoreFdInfo.pNext = nullptr;
    importSemaphoreFdInfo.semaphore = semaphore;
    importSemaphoreFdInfo.flags = 0;
    importSemaphoreFdInfo.handleType = kHandleType;
    importSemaphoreFdInfo.fd = handle;

    MaybeError status = CheckVkSuccess(
        mDevice->fn.ImportSemaphoreFdKHR(mDevice->GetVkDevice(), &importSemaphoreFdInfo),
        "vkImportSemaphoreFdKHR");

    if (status.IsError()) {
        mDevice->fn.DestroySemaphore(mDevice->GetVkDevice(), semaphore, nullptr);
        DAWN_TRY(std::move(status));
    }

    return semaphore;
}

ResultOrError<VkSemaphore> Service::CreateExportableSemaphore() {
    VkExportSemaphoreCreateInfoKHR exportSemaphoreInfo;
    exportSemaphoreInfo.sType = VK_STRUCTURE_TYPE_EXPORT_SEMAPHORE_CREATE_INFO_KHR;
    exportSemaphoreInfo.pNext = nullptr;
    exportSemaphoreInfo.handleTypes = kHandleType;

    VkSemaphoreCreateInfo semaphoreCreateInfo;
    semaphoreCreateInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
    semaphoreCreateInfo.pNext = &exportSemaphoreInfo;
    semaphoreCreateInfo.flags = 0;

    VkSemaphore signalSemaphore;
    DAWN_TRY(
        CheckVkSuccess(mDevice->fn.CreateSemaphore(mDevice->GetVkDevice(), &semaphoreCreateInfo,
                                                   nullptr, &*signalSemaphore),
                       "vkCreateSemaphore"));
    return signalSemaphore;
}

ResultOrError<ExternalSemaphoreHandle> Service::ExportSemaphore(VkSemaphore semaphore) {
    VkSemaphoreGetFdInfoKHR semaphoreGetFdInfo;
    semaphoreGetFdInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_GET_FD_INFO_KHR;
    semaphoreGetFdInfo.pNext = nullptr;
    semaphoreGetFdInfo.semaphore = semaphore;
    semaphoreGetFdInfo.handleType = kHandleType;

    int fd = -1;
    DAWN_TRY(CheckVkSuccess(
        mDevice->fn.GetSemaphoreFdKHR(mDevice->GetVkDevice(), &semaphoreGetFdInfo, &fd),
        "vkGetSemaphoreFdKHR"));

    ASSERT(fd >= 0);
    return fd;
}

}  // namespace dawn::native::vulkan::external_semaphore