// 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 "common/Log.h"
#include "dawn_native/vulkan/AdapterVk.h"
#include "dawn_native/vulkan/BackendVk.h"
#include "dawn_native/vulkan/VulkanError.h"

#include <cstring>

namespace dawn_native { namespace vulkan {

    namespace {
        bool IsLayerName(const VkLayerProperties& layer, const char* name) {
            return strncmp(layer.layerName, name, VK_MAX_EXTENSION_NAME_SIZE) == 0;
        }

        bool EnumerateInstanceExtensions(const char* layerName,
                                         const dawn_native::vulkan::VulkanFunctions& vkFunctions,
                                         std::vector<VkExtensionProperties>* extensions) {
            uint32_t count = 0;
            VkResult result = VkResult::WrapUnsafe(
                vkFunctions.EnumerateInstanceExtensionProperties(layerName, &count, nullptr));
            if (result != VK_SUCCESS && result != VK_INCOMPLETE) {
                return false;
            }
            extensions->resize(count);
            result = VkResult::WrapUnsafe(vkFunctions.EnumerateInstanceExtensionProperties(
                layerName, &count, extensions->data()));
            return (result == VK_SUCCESS);
        }

    }  // namespace

    const char kLayerNameKhronosValidation[] = "VK_LAYER_KHRONOS_validation";
    const char kLayerNameLunargVKTrace[] = "VK_LAYER_LUNARG_vktrace";
    const char kLayerNameRenderDocCapture[] = "VK_LAYER_RENDERDOC_Capture";
    const char kLayerNameFuchsiaImagePipeSwapchain[] = "VK_LAYER_FUCHSIA_imagepipe_swapchain";

    bool VulkanGlobalKnobs::HasExt(InstanceExt ext) const {
        return extensions.Has(ext);
    }

    bool VulkanDeviceKnobs::HasExt(DeviceExt ext) const {
        return extensions.Has(ext);
    }

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

        // Gather info on available API version
        {
            uint32_t supportedAPIVersion = VK_MAKE_VERSION(1, 0, 0);
            if (vkFunctions.EnumerateInstanceVersion) {
                vkFunctions.EnumerateInstanceVersion(&supportedAPIVersion);
            }

            // Use Vulkan 1.1 if it's available.
            info.apiVersion = (supportedAPIVersion >= VK_MAKE_VERSION(1, 1, 0))
                                  ? VK_MAKE_VERSION(1, 1, 0)
                                  : VK_MAKE_VERSION(1, 0, 0);
        }

        // 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");
            }

            info.layers.resize(count);
            DAWN_TRY(CheckVkSuccess(
                vkFunctions.EnumerateInstanceLayerProperties(&count, info.layers.data()),
                "vkEnumerateInstanceLayerProperties"));

            for (const auto& layer : info.layers) {
                if (IsLayerName(layer, kLayerNameKhronosValidation)) {
                    info.validation = true;
                }
                if (IsLayerName(layer, kLayerNameLunargVKTrace)) {
                    info.vktrace = true;
                }
                if (IsLayerName(layer, kLayerNameRenderDocCapture)) {
                    info.renderDocCapture = true;
                }
                // Technical note: Fuchsia implements the swapchain through
                // a layer (VK_LAYER_FUCHSIA_image_pipe_swapchain), which adds
                // an instance extensions (VK_FUCHSIA_image_surface) to all ICDs.
                if (IsLayerName(layer, kLayerNameFuchsiaImagePipeSwapchain)) {
                    info.fuchsiaImagePipeSwapchain = true;
                }
            }
        }

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

            std::vector<VkExtensionProperties> extensionsProperties;
            if (!EnumerateInstanceExtensions(nullptr, vkFunctions, &extensionsProperties)) {
                return DAWN_INTERNAL_ERROR("vkEnumerateInstanceExtensionProperties");
            }

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

            // Specific handling for the Fuchsia swapchain surface creation extension
            // which is normally part of the Fuchsia-specific swapchain layer.
            if (info.fuchsiaImagePipeSwapchain &&
                !info.HasExt(InstanceExt::FuchsiaImagePipeSurface)) {
                if (!EnumerateInstanceExtensions(kLayerNameFuchsiaImagePipeSwapchain, vkFunctions,
                                                 &extensionsProperties)) {
                    return DAWN_INTERNAL_ERROR("vkEnumerateInstanceExtensionProperties");
                }

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

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

        // TODO(cwallez@chromium:org): Each layer can expose additional extensions, query them?

        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();

        // Gather general info about the device
        vkFunctions.GetPhysicalDeviceProperties(physicalDevice, &info.properties);
        vkFunctions.GetPhysicalDeviceFeatures(physicalDevice, &info.features);

        // 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);
        }

        // Gather additional information for some of the extensions
        {
            if (info.extensions.Has(DeviceExt::ShaderFloat16Int8)) {
                info.shaderFloat16Int8Features.sType =
                    VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_FLOAT16_INT8_FEATURES_KHR;

                VkPhysicalDeviceFeatures2KHR physicalDeviceFeatures2 = {};
                physicalDeviceFeatures2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2_KHR;
                physicalDeviceFeatures2.pNext = &info.shaderFloat16Int8Features;
                vkFunctions.GetPhysicalDeviceFeatures2(physicalDevice, &physicalDeviceFeatures2);
            }

            if (info.extensions.Has(DeviceExt::_16BitStorage)) {
                info._16BitStorageFeatures.sType =
                    VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_16BIT_STORAGE_FEATURES;

                VkPhysicalDeviceFeatures2 physicalDeviceFeatures2 = {};
                physicalDeviceFeatures2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2;
                physicalDeviceFeatures2.pNext = &info._16BitStorageFeatures;
                vkFunctions.GetPhysicalDeviceFeatures2(physicalDevice, &physicalDeviceFeatures2);
            }
        }

        // 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