// Copyright 2017 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/VulkanInfo.h"

#include "dawn_native/vulkan/AdapterVk.h"
#include "dawn_native/vulkan/BackendVk.h"
#include "dawn_native/vulkan/UtilsVulkan.h"
#include "dawn_native/vulkan/VulkanError.h"

#include <cstring>

namespace dawn_native { namespace vulkan {

    namespace {
        ResultOrError<InstanceExtSet> GatherInstanceExtensions(
            const char* layerName,
            const dawn_native::vulkan::VulkanFunctions& vkFunctions,
            const std::unordered_map<std::string, InstanceExt>& knownExts) {
            uint32_t count = 0;
            VkResult vkResult = VkResult::WrapUnsafe(
                vkFunctions.EnumerateInstanceExtensionProperties(layerName, &count, nullptr));
            if (vkResult != VK_SUCCESS && vkResult != VK_INCOMPLETE) {
                return DAWN_INTERNAL_ERROR("vkEnumerateInstanceExtensionProperties");
            }

            std::vector<VkExtensionProperties> extensions(count);
            DAWN_TRY(CheckVkSuccess(vkFunctions.EnumerateInstanceExtensionProperties(
                                        layerName, &count, extensions.data()),
                                    "vkEnumerateInstanceExtensionProperties"));

            InstanceExtSet result;
            for (const VkExtensionProperties& extension : extensions) {
                auto it = knownExts.find(extension.extensionName);
                if (it != knownExts.end()) {
                    result.set(it->second, true);
                }
            }

            return result;
        }

    }  // namespace

    bool VulkanGlobalKnobs::HasExt(InstanceExt ext) const {
        return extensions[ext];
    }

    bool VulkanDeviceKnobs::HasExt(DeviceExt ext) const {
        return extensions[ext];
    }

    ResultOrError<VulkanGlobalInfo> GatherGlobalInfo(const Backend& backend) {
        VulkanGlobalInfo info = {};
        const VulkanFunctions& vkFunctions = backend.GetFunctions();

        // Gather info on available API version
        {
            info.apiVersion = VK_MAKE_VERSION(1, 0, 0);
            if (vkFunctions.EnumerateInstanceVersion != nullptr) {
                DAWN_TRY(CheckVkSuccess(vkFunctions.EnumerateInstanceVersion(&info.apiVersion),
                                        "vkEnumerateInstanceVersion"));
            }
        }

        // Gather the info about the instance layers
        {
            uint32_t count = 0;
            VkResult result =
                VkResult::WrapUnsafe(vkFunctions.EnumerateInstanceLayerProperties(&count, nullptr));
            // From the Vulkan spec result should be success if there are 0 layers,
            // incomplete otherwise. This means that both values represent a success.
            // This is the same for all Enumarte functions
            if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
                return DAWN_INTERNAL_ERROR("vkEnumerateInstanceLayerProperties");
            }

            std::vector<VkLayerProperties> layersProperties(count);
            DAWN_TRY(CheckVkSuccess(
                vkFunctions.EnumerateInstanceLayerProperties(&count, layersProperties.data()),
                "vkEnumerateInstanceLayerProperties"));

            std::unordered_map<std::string, VulkanLayer> knownLayers = CreateVulkanLayerNameMap();
            for (const VkLayerProperties& layer : layersProperties) {
                auto it = knownLayers.find(layer.layerName);
                if (it != knownLayers.end()) {
                    info.layers.set(it->second, true);
                }
            }
        }

        // Gather the info about the instance extensions
        {
            std::unordered_map<std::string, InstanceExt> knownExts = CreateInstanceExtNameMap();

            DAWN_TRY_ASSIGN(info.extensions,
                            GatherInstanceExtensions(nullptr, vkFunctions, knownExts));
            MarkPromotedExtensions(&info.extensions, info.apiVersion);
            info.extensions = EnsureDependencies(info.extensions);

            for (VulkanLayer layer : IterateBitSet(info.layers)) {
                DAWN_TRY_ASSIGN(info.layerExtensions[layer],
                                GatherInstanceExtensions(GetVulkanLayerInfo(layer).name,
                                                         vkFunctions, knownExts));
                MarkPromotedExtensions(&info.layerExtensions[layer], info.apiVersion);
                info.layerExtensions[layer] = EnsureDependencies(info.layerExtensions[layer]);
            }
        }

        return std::move(info);
    }

    ResultOrError<std::vector<VkPhysicalDevice>> GetPhysicalDevices(const Backend& backend) {
        VkInstance instance = backend.GetVkInstance();
        const VulkanFunctions& vkFunctions = backend.GetFunctions();

        uint32_t count = 0;
        VkResult result =
            VkResult::WrapUnsafe(vkFunctions.EnumeratePhysicalDevices(instance, &count, nullptr));
        if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
            return DAWN_INTERNAL_ERROR("vkEnumeratePhysicalDevices");
        }

        std::vector<VkPhysicalDevice> physicalDevices(count);
        DAWN_TRY(CheckVkSuccess(
            vkFunctions.EnumeratePhysicalDevices(instance, &count, physicalDevices.data()),
            "vkEnumeratePhysicalDevices"));

        return std::move(physicalDevices);
    }

    ResultOrError<VulkanDeviceInfo> GatherDeviceInfo(const Adapter& adapter) {
        VulkanDeviceInfo info = {};
        VkPhysicalDevice physicalDevice = adapter.GetPhysicalDevice();
        const VulkanGlobalInfo& globalInfo = adapter.GetBackend()->GetGlobalInfo();
        const VulkanFunctions& vkFunctions = adapter.GetBackend()->GetFunctions();

        // Query the device properties first to get the ICD's `apiVersion`
        vkFunctions.GetPhysicalDeviceProperties(physicalDevice, &info.properties);

        // Gather info about device memory.
        {
            VkPhysicalDeviceMemoryProperties memory;
            vkFunctions.GetPhysicalDeviceMemoryProperties(physicalDevice, &memory);

            info.memoryTypes.assign(memory.memoryTypes,
                                    memory.memoryTypes + memory.memoryTypeCount);
            info.memoryHeaps.assign(memory.memoryHeaps,
                                    memory.memoryHeaps + memory.memoryHeapCount);
        }

        // Gather info about device queue families
        {
            uint32_t count = 0;
            vkFunctions.GetPhysicalDeviceQueueFamilyProperties(physicalDevice, &count, nullptr);

            info.queueFamilies.resize(count);
            vkFunctions.GetPhysicalDeviceQueueFamilyProperties(physicalDevice, &count,
                                                               info.queueFamilies.data());
        }

        // Gather the info about the device layers
        {
            uint32_t count = 0;
            VkResult result = VkResult::WrapUnsafe(
                vkFunctions.EnumerateDeviceLayerProperties(physicalDevice, &count, nullptr));
            if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
                return DAWN_INTERNAL_ERROR("vkEnumerateDeviceLayerProperties");
            }

            info.layers.resize(count);
            DAWN_TRY(CheckVkSuccess(vkFunctions.EnumerateDeviceLayerProperties(
                                        physicalDevice, &count, info.layers.data()),
                                    "vkEnumerateDeviceLayerProperties"));
        }

        // Gather the info about the device extensions
        {
            uint32_t count = 0;
            VkResult result = VkResult::WrapUnsafe(vkFunctions.EnumerateDeviceExtensionProperties(
                physicalDevice, nullptr, &count, nullptr));
            if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
                return DAWN_INTERNAL_ERROR("vkEnumerateDeviceExtensionProperties");
            }

            std::vector<VkExtensionProperties> extensionsProperties;
            extensionsProperties.resize(count);
            DAWN_TRY(
                CheckVkSuccess(vkFunctions.EnumerateDeviceExtensionProperties(
                                   physicalDevice, nullptr, &count, extensionsProperties.data()),
                               "vkEnumerateDeviceExtensionProperties"));

            std::unordered_map<std::string, DeviceExt> knownExts = CreateDeviceExtNameMap();

            for (const VkExtensionProperties& extension : extensionsProperties) {
                auto it = knownExts.find(extension.extensionName);
                if (it != knownExts.end()) {
                    info.extensions.set(it->second, true);
                }
            }

            MarkPromotedExtensions(&info.extensions, info.properties.apiVersion);
            info.extensions = EnsureDependencies(info.extensions, globalInfo.extensions,
                                                 info.properties.apiVersion);
        }

        // Gather general and extension features and properties
        //
        // Use vkGetPhysicalDevice{Features,Properties}2 if required to gather information about
        // the extensions. DeviceExt::GetPhysicalDeviceProperties2 is guaranteed to be available
        // because these extensions (transitively) depend on it in `EnsureDependencies`
        VkPhysicalDeviceFeatures2 features2 = {};
        features2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2;
        PNextChainBuilder featuresChain(&features2);

        VkPhysicalDeviceProperties2 properties2 = {};
        properties2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2;
        PNextChainBuilder propertiesChain(&properties2);

        if (info.extensions[DeviceExt::ShaderFloat16Int8]) {
            featuresChain.Add(&info.shaderFloat16Int8Features,
                              VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_FLOAT16_INT8_FEATURES_KHR);
        }

        if (info.extensions[DeviceExt::_16BitStorage]) {
            featuresChain.Add(&info._16BitStorageFeatures,
                              VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_16BIT_STORAGE_FEATURES);
        }

        if (info.extensions[DeviceExt::SubgroupSizeControl]) {
            featuresChain.Add(&info.subgroupSizeControlFeatures,
                              VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_SIZE_CONTROL_FEATURES_EXT);
            propertiesChain.Add(
                &info.subgroupSizeControlProperties,
                VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_SIZE_CONTROL_PROPERTIES_EXT);
        }

        if (info.extensions[DeviceExt::DriverProperties]) {
            propertiesChain.Add(&info.driverProperties,
                                VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DRIVER_PROPERTIES);
        }

        // If we have DeviceExt::GetPhysicalDeviceProperties2, use features2 and properties2 so
        // that features no covered by VkPhysicalDevice{Features,Properties} can be queried.
        //
        // Note that info.properties has already been filled at the start of this function to get
        // `apiVersion`.
        ASSERT(info.properties.apiVersion != 0);
        if (info.extensions[DeviceExt::GetPhysicalDeviceProperties2]) {
            vkFunctions.GetPhysicalDeviceProperties2(physicalDevice, &properties2);
            vkFunctions.GetPhysicalDeviceFeatures2(physicalDevice, &features2);
            info.features = features2.features;
        } else {
            ASSERT(features2.pNext == nullptr && properties2.pNext == nullptr);
            vkFunctions.GetPhysicalDeviceFeatures(physicalDevice, &info.features);
        }

        // TODO(cwallez@chromium.org): gather info about formats

        return std::move(info);
    }

    ResultOrError<VulkanSurfaceInfo> GatherSurfaceInfo(const Adapter& adapter,
                                                       VkSurfaceKHR surface) {
        VulkanSurfaceInfo info = {};

        VkPhysicalDevice physicalDevice = adapter.GetPhysicalDevice();
        const VulkanFunctions& vkFunctions = adapter.GetBackend()->GetFunctions();

        // Get the surface capabilities
        DAWN_TRY(CheckVkSuccess(vkFunctions.GetPhysicalDeviceSurfaceCapabilitiesKHR(
                                    physicalDevice, surface, &info.capabilities),
                                "vkGetPhysicalDeviceSurfaceCapabilitiesKHR"));

        // Query which queue families support presenting this surface
        {
            size_t nQueueFamilies = adapter.GetDeviceInfo().queueFamilies.size();
            info.supportedQueueFamilies.resize(nQueueFamilies, false);

            for (uint32_t i = 0; i < nQueueFamilies; ++i) {
                VkBool32 supported = VK_FALSE;
                DAWN_TRY(CheckVkSuccess(vkFunctions.GetPhysicalDeviceSurfaceSupportKHR(
                                            physicalDevice, i, surface, &supported),
                                        "vkGetPhysicalDeviceSurfaceSupportKHR"));

                info.supportedQueueFamilies[i] = (supported == VK_TRUE);
            }
        }

        // Gather supported formats
        {
            uint32_t count = 0;
            VkResult result = VkResult::WrapUnsafe(vkFunctions.GetPhysicalDeviceSurfaceFormatsKHR(
                physicalDevice, surface, &count, nullptr));
            if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
                return DAWN_INTERNAL_ERROR("vkGetPhysicalDeviceSurfaceFormatsKHR");
            }

            info.formats.resize(count);
            DAWN_TRY(CheckVkSuccess(vkFunctions.GetPhysicalDeviceSurfaceFormatsKHR(
                                        physicalDevice, surface, &count, info.formats.data()),
                                    "vkGetPhysicalDeviceSurfaceFormatsKHR"));
        }

        // Gather supported presents modes
        {
            uint32_t count = 0;
            VkResult result =
                VkResult::WrapUnsafe(vkFunctions.GetPhysicalDeviceSurfacePresentModesKHR(
                    physicalDevice, surface, &count, nullptr));
            if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
                return DAWN_INTERNAL_ERROR("vkGetPhysicalDeviceSurfacePresentModesKHR");
            }

            info.presentModes.resize(count);
            DAWN_TRY(CheckVkSuccess(vkFunctions.GetPhysicalDeviceSurfacePresentModesKHR(
                                        physicalDevice, surface, &count, info.presentModes.data()),
                                    "vkGetPhysicalDeviceSurfacePresentModesKHR"));
        }

        return std::move(info);
    }

}}  // namespace dawn_native::vulkan