//
// Copyright 2021 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// libvulkan_loader.cpp:
//    Helper functions for the loading Vulkan libraries.
//

#include "common/vulkan/libvulkan_loader.h"

#include "common/system_utils.h"

namespace angle
{
namespace vk
{
void *OpenLibVulkan()
{
    constexpr const char *kLibVulkanNames[] = {
#if defined(ANGLE_PLATFORM_WINDOWS)
        "vulkan-1.dll",
#elif defined(ANGLE_PLATFORM_APPLE)
        "libvulkan.dylib", "libvulkan.1.dylib", "libMoltenVK.dylib",
        // Fallback paths for static macOS builds where the Vulkan loader is bundled
        // in the "Libraries/" subdirectory but the host module (containing ANGLE)
        // is in the parent directory.
        "Libraries/libvulkan.dylib", "Libraries/libvulkan.1.dylib", "Libraries/libMoltenVK.dylib"
#else
        "libvulkan.so",
        "libvulkan.so.1",
#endif
    };

    constexpr SearchType kSearchTypes[] = {
// On Android and Fuchsia we use the system libvulkan.
#if defined(ANGLE_USE_CUSTOM_LIBVULKAN)
        SearchType::ModuleDir,
#else
        SearchType::SystemDir,
#endif  // defined(ANGLE_USE_CUSTOM_LIBVULKAN)
    };

    for (angle::SearchType searchType : kSearchTypes)
    {
        for (const char *libraryName : kLibVulkanNames)
        {
            void *library = OpenSystemLibraryWithExtension(libraryName, searchType);
            if (library)
            {
                return library;
            }
        }
    }

    return nullptr;
}
}  // namespace vk
}  // namespace angle