// 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/VulkanExtensions.h"

#include <array>
#include <limits>

#include "dawn/common/Assert.h"
#include "dawn/common/vulkan_platform.h"

namespace dawn::native::vulkan {

static constexpr uint32_t VulkanVersion_1_1 = VK_API_VERSION_1_1;
static constexpr uint32_t VulkanVersion_1_2 = VK_API_VERSION_1_2;
static constexpr uint32_t VulkanVersion_1_3 = VK_API_VERSION_1_3;
static constexpr uint32_t NeverPromoted = std::numeric_limits<uint32_t>::max();

// A static array for InstanceExtInfo that can be indexed with InstanceExts.
// GetInstanceExtInfo checks that "index" matches the index used to access this array so an
// assert will fire if it isn't in the correct order.
static constexpr size_t kInstanceExtCount = static_cast<size_t>(InstanceExt::EnumCount);
static constexpr std::array<InstanceExtInfo, kInstanceExtCount> sInstanceExtInfos{{
    //
    {InstanceExt::GetPhysicalDeviceProperties2, "VK_KHR_get_physical_device_properties2",
     VulkanVersion_1_1},
    {InstanceExt::ExternalMemoryCapabilities, "VK_KHR_external_memory_capabilities",
     VulkanVersion_1_1},
    {InstanceExt::ExternalSemaphoreCapabilities, "VK_KHR_external_semaphore_capabilities",
     VulkanVersion_1_1},

    {InstanceExt::Surface, "VK_KHR_surface", NeverPromoted},
    {InstanceExt::FuchsiaImagePipeSurface, "VK_FUCHSIA_imagepipe_surface", NeverPromoted},
    {InstanceExt::MetalSurface, "VK_EXT_metal_surface", NeverPromoted},
    {InstanceExt::WaylandSurface, "VK_KHR_wayland_surface", NeverPromoted},
    {InstanceExt::Win32Surface, "VK_KHR_win32_surface", NeverPromoted},
    {InstanceExt::XcbSurface, "VK_KHR_xcb_surface", NeverPromoted},
    {InstanceExt::XlibSurface, "VK_KHR_xlib_surface", NeverPromoted},
    {InstanceExt::AndroidSurface, "VK_KHR_android_surface", NeverPromoted},

    {InstanceExt::DebugUtils, "VK_EXT_debug_utils", NeverPromoted},
    {InstanceExt::ValidationFeatures, "VK_EXT_validation_features", NeverPromoted},
    //
}};

const InstanceExtInfo& GetInstanceExtInfo(InstanceExt ext) {
    uint32_t index = static_cast<uint32_t>(ext);
    ASSERT(index < sInstanceExtInfos.size());
    ASSERT(sInstanceExtInfos[index].index == ext);
    return sInstanceExtInfos[index];
}

std::unordered_map<std::string, InstanceExt> CreateInstanceExtNameMap() {
    std::unordered_map<std::string, InstanceExt> result;
    for (const InstanceExtInfo& info : sInstanceExtInfos) {
        result[info.name] = info.index;
    }
    return result;
}

InstanceExtSet EnsureDependencies(const InstanceExtSet& advertisedExts) {
    // We need to check that all transitive dependencies of extensions are advertised.
    // To do that in a single pass and no data structures, the extensions are topologically
    // sorted in the definition of InstanceExt.
    // To ensure the order is correct, we mark visited extensions in `visitedSet` and each
    // dependency check will first assert all its dependents have been visited.
    InstanceExtSet visitedSet;
    InstanceExtSet trimmedSet;

    auto HasDep = [&](InstanceExt ext) -> bool {
        ASSERT(visitedSet[ext]);
        return trimmedSet[ext];
    };

    for (uint32_t i = 0; i < sInstanceExtInfos.size(); i++) {
        InstanceExt ext = static_cast<InstanceExt>(i);

        bool hasDependencies = false;
        switch (ext) {
            case InstanceExt::GetPhysicalDeviceProperties2:
            case InstanceExt::Surface:
            case InstanceExt::DebugUtils:
            case InstanceExt::ValidationFeatures:
                hasDependencies = true;
                break;

            case InstanceExt::ExternalMemoryCapabilities:
            case InstanceExt::ExternalSemaphoreCapabilities:
                hasDependencies = HasDep(InstanceExt::GetPhysicalDeviceProperties2);
                break;

            case InstanceExt::AndroidSurface:
            case InstanceExt::FuchsiaImagePipeSurface:
            case InstanceExt::MetalSurface:
            case InstanceExt::WaylandSurface:
            case InstanceExt::Win32Surface:
            case InstanceExt::XcbSurface:
            case InstanceExt::XlibSurface:
                hasDependencies = HasDep(InstanceExt::Surface);
                break;

            case InstanceExt::EnumCount:
                UNREACHABLE();
        }

        trimmedSet.set(ext, hasDependencies && advertisedExts[ext]);
        visitedSet.set(ext, true);
    }

    return trimmedSet;
}

void MarkPromotedExtensions(InstanceExtSet* extensions, uint32_t version) {
    for (const InstanceExtInfo& info : sInstanceExtInfos) {
        if (info.versionPromoted <= version) {
            extensions->set(info.index, true);
        }
    }
}

static constexpr size_t kDeviceExtCount = static_cast<size_t>(DeviceExt::EnumCount);
static constexpr std::array<DeviceExtInfo, kDeviceExtCount> sDeviceExtInfos{{
    //
    {DeviceExt::BindMemory2, "VK_KHR_bind_memory2", VulkanVersion_1_1},
    {DeviceExt::Maintenance1, "VK_KHR_maintenance1", VulkanVersion_1_1},
    {DeviceExt::StorageBufferStorageClass, "VK_KHR_storage_buffer_storage_class",
     VulkanVersion_1_1},
    {DeviceExt::GetPhysicalDeviceProperties2, "VK_KHR_get_physical_device_properties2",
     VulkanVersion_1_1},
    {DeviceExt::GetMemoryRequirements2, "VK_KHR_get_memory_requirements2", VulkanVersion_1_1},
    {DeviceExt::ExternalMemoryCapabilities, "VK_KHR_external_memory_capabilities",
     VulkanVersion_1_1},
    {DeviceExt::ExternalSemaphoreCapabilities, "VK_KHR_external_semaphore_capabilities",
     VulkanVersion_1_1},
    {DeviceExt::ExternalMemory, "VK_KHR_external_memory", VulkanVersion_1_1},
    {DeviceExt::ExternalSemaphore, "VK_KHR_external_semaphore", VulkanVersion_1_1},
    {DeviceExt::_16BitStorage, "VK_KHR_16bit_storage", VulkanVersion_1_1},
    {DeviceExt::SamplerYCbCrConversion, "VK_KHR_sampler_ycbcr_conversion", VulkanVersion_1_1},

    {DeviceExt::DriverProperties, "VK_KHR_driver_properties", VulkanVersion_1_2},
    {DeviceExt::ImageFormatList, "VK_KHR_image_format_list", VulkanVersion_1_2},
    {DeviceExt::ShaderFloat16Int8, "VK_KHR_shader_float16_int8", VulkanVersion_1_2},

    {DeviceExt::ShaderIntegerDotProduct, "VK_KHR_shader_integer_dot_product", VulkanVersion_1_3},
    {DeviceExt::ZeroInitializeWorkgroupMemory, "VK_KHR_zero_initialize_workgroup_memory",
     VulkanVersion_1_3},

    {DeviceExt::ExternalMemoryFD, "VK_KHR_external_memory_fd", NeverPromoted},
    {DeviceExt::ExternalMemoryDmaBuf, "VK_EXT_external_memory_dma_buf", NeverPromoted},
    {DeviceExt::ExternalMemoryZirconHandle, "VK_FUCHSIA_external_memory", NeverPromoted},
    {DeviceExt::ExternalSemaphoreFD, "VK_KHR_external_semaphore_fd", NeverPromoted},
    {DeviceExt::ExternalSemaphoreZirconHandle, "VK_FUCHSIA_external_semaphore", NeverPromoted},

    {DeviceExt::ImageDrmFormatModifier, "VK_EXT_image_drm_format_modifier", NeverPromoted},
    {DeviceExt::Swapchain, "VK_KHR_swapchain", NeverPromoted},
    {DeviceExt::SubgroupSizeControl, "VK_EXT_subgroup_size_control", NeverPromoted},
    //
}};

const DeviceExtInfo& GetDeviceExtInfo(DeviceExt ext) {
    uint32_t index = static_cast<uint32_t>(ext);
    ASSERT(index < sDeviceExtInfos.size());
    ASSERT(sDeviceExtInfos[index].index == ext);
    return sDeviceExtInfos[index];
}

std::unordered_map<std::string, DeviceExt> CreateDeviceExtNameMap() {
    std::unordered_map<std::string, DeviceExt> result;
    for (const DeviceExtInfo& info : sDeviceExtInfos) {
        result[info.name] = info.index;
    }
    return result;
}

DeviceExtSet EnsureDependencies(const DeviceExtSet& advertisedExts,
                                const InstanceExtSet& instanceExts,
                                uint32_t icdVersion) {
    // This is very similar to EnsureDependencies for instanceExtSet. See comment there for
    // an explanation of what happens.
    DeviceExtSet visitedSet;
    DeviceExtSet trimmedSet;

    auto HasDep = [&](DeviceExt ext) -> bool {
        ASSERT(visitedSet[ext]);
        return trimmedSet[ext];
    };

    for (uint32_t i = 0; i < sDeviceExtInfos.size(); i++) {
        DeviceExt ext = static_cast<DeviceExt>(i);

        bool hasDependencies = false;
        switch (ext) {
            // Happy extensions don't need anybody else!
            case DeviceExt::BindMemory2:
            case DeviceExt::GetMemoryRequirements2:
            case DeviceExt::Maintenance1:
            case DeviceExt::ImageFormatList:
            case DeviceExt::StorageBufferStorageClass:
                hasDependencies = true;
                break;

            // Physical device extensions technically don't require the instance to support
            // them but VulkanFunctions only loads the function pointers if the instance
            // advertises the extension. So if we didn't have this check, we'd risk a calling
            // a nullptr.
            case DeviceExt::GetPhysicalDeviceProperties2:
                hasDependencies = instanceExts[InstanceExt::GetPhysicalDeviceProperties2];
                break;
            case DeviceExt::ExternalMemoryCapabilities:
                hasDependencies = instanceExts[InstanceExt::ExternalMemoryCapabilities] &&
                                  HasDep(DeviceExt::GetPhysicalDeviceProperties2);
                break;
            case DeviceExt::ExternalSemaphoreCapabilities:
                hasDependencies = instanceExts[InstanceExt::ExternalSemaphoreCapabilities] &&
                                  HasDep(DeviceExt::GetPhysicalDeviceProperties2);
                break;

            case DeviceExt::ImageDrmFormatModifier:
                hasDependencies = HasDep(DeviceExt::BindMemory2) &&
                                  HasDep(DeviceExt::GetPhysicalDeviceProperties2) &&
                                  HasDep(DeviceExt::ImageFormatList) &&
                                  HasDep(DeviceExt::SamplerYCbCrConversion);
                break;

            case DeviceExt::Swapchain:
                hasDependencies = instanceExts[InstanceExt::Surface];
                break;

            case DeviceExt::SamplerYCbCrConversion:
                hasDependencies = HasDep(DeviceExt::Maintenance1) &&
                                  HasDep(DeviceExt::BindMemory2) &&
                                  HasDep(DeviceExt::GetMemoryRequirements2) &&
                                  HasDep(DeviceExt::GetPhysicalDeviceProperties2);
                break;

            case DeviceExt::DriverProperties:
            case DeviceExt::ShaderFloat16Int8:
                hasDependencies = HasDep(DeviceExt::GetPhysicalDeviceProperties2);
                break;

            case DeviceExt::ExternalMemory:
                hasDependencies = HasDep(DeviceExt::ExternalMemoryCapabilities);
                break;

            case DeviceExt::ExternalSemaphore:
                hasDependencies = HasDep(DeviceExt::ExternalSemaphoreCapabilities);
                break;

            case DeviceExt::ExternalMemoryFD:
            case DeviceExt::ExternalMemoryZirconHandle:
                hasDependencies = HasDep(DeviceExt::ExternalMemory);
                break;

            case DeviceExt::ExternalMemoryDmaBuf:
                hasDependencies = HasDep(DeviceExt::ExternalMemoryFD);
                break;

            case DeviceExt::ExternalSemaphoreFD:
            case DeviceExt::ExternalSemaphoreZirconHandle:
                hasDependencies = HasDep(DeviceExt::ExternalSemaphore);
                break;

            case DeviceExt::_16BitStorage:
                hasDependencies = HasDep(DeviceExt::GetPhysicalDeviceProperties2) &&
                                  HasDep(DeviceExt::StorageBufferStorageClass);
                break;

            case DeviceExt::SubgroupSizeControl:
                // Using the extension requires DeviceExt::GetPhysicalDeviceProperties2, but we
                // don't need to check for it as it also requires Vulkan 1.1 in which
                // VK_KHR_get_physical_device_properties2 was promoted.
                hasDependencies = icdVersion >= VulkanVersion_1_1;
                break;

            case DeviceExt::ShaderIntegerDotProduct:
            case DeviceExt::ZeroInitializeWorkgroupMemory:
                hasDependencies = HasDep(DeviceExt::GetPhysicalDeviceProperties2);
                break;

            case DeviceExt::EnumCount:
                UNREACHABLE();
        }

        trimmedSet.set(ext, hasDependencies && advertisedExts[ext]);
        visitedSet.set(ext, true);
    }

    return trimmedSet;
}

void MarkPromotedExtensions(DeviceExtSet* extensions, uint32_t version) {
    for (const DeviceExtInfo& info : sDeviceExtInfos) {
        if (info.versionPromoted <= version) {
            extensions->set(info.index, true);
        }
    }
}

// A static array for VulkanLayerInfo that can be indexed with VulkanLayers.
// GetVulkanLayerInfo checks that "index" matches the index used to access this array so an
// assert will fire if it isn't in the correct order.
static constexpr size_t kVulkanLayerCount = static_cast<size_t>(VulkanLayer::EnumCount);
static constexpr std::array<VulkanLayerInfo, kVulkanLayerCount> sVulkanLayerInfos{{
    //
    {VulkanLayer::Validation, "VK_LAYER_KHRONOS_validation"},
    {VulkanLayer::LunargVkTrace, "VK_LAYER_LUNARG_vktrace"},
    {VulkanLayer::RenderDocCapture, "VK_LAYER_RENDERDOC_Capture"},
    {VulkanLayer::FuchsiaImagePipeSwapchain, "VK_LAYER_FUCHSIA_imagepipe_swapchain"},
    //
}};

const VulkanLayerInfo& GetVulkanLayerInfo(VulkanLayer layer) {
    uint32_t index = static_cast<uint32_t>(layer);
    ASSERT(index < sVulkanLayerInfos.size());
    ASSERT(sVulkanLayerInfos[index].layer == layer);
    return sVulkanLayerInfos[index];
}

std::unordered_map<std::string, VulkanLayer> CreateVulkanLayerNameMap() {
    std::unordered_map<std::string, VulkanLayer> result;
    for (const VulkanLayerInfo& info : sVulkanLayerInfos) {
        result[info.name] = info.layer;
    }
    return result;
}

}  // namespace dawn::native::vulkan