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// 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.
#ifndef SRC_DAWN_COMMON_VULKAN_PLATFORM_H_
#define SRC_DAWN_COMMON_VULKAN_PLATFORM_H_
#if !defined(DAWN_ENABLE_BACKEND_VULKAN)
#error "vulkan_platform.h included without the Vulkan backend enabled"
#endif
#if defined(VULKAN_CORE_H_)
#error "vulkan.h included before vulkan_platform.h"
#endif
#include <cstddef>
#include <cstdint>
#include "dawn/common/Platform.h"
// vulkan.h defines non-dispatchable handles to opaque pointers on 64bit architectures and uint64_t
// on 32bit architectures. This causes a problem in 32bit where the handles cannot be used to
// distinguish between overloads of the same function.
// Change the definition of non-dispatchable handles to be opaque structures containing a uint64_t
// and overload the comparison operators between themselves and VK_NULL_HANDLE (which will be
// redefined to be nullptr). This keeps the type-safety of having the handles be different types
// (like vulkan.h on 64 bit) but makes sure the types are different on 32 bit architectures.
#if DAWN_PLATFORM_IS(64_BIT)
#define DAWN_DEFINE_NATIVE_NON_DISPATCHABLE_HANDLE(object) using object = struct object##_T*;
// This function is needed because MSVC doesn't accept reinterpret_cast from uint64_t from uint64_t
// TODO(cwallez@chromium.org): Remove this once we rework vulkan_platform.h
template <typename T>
T NativeNonDispatachableHandleFromU64(uint64_t u64) {
return reinterpret_cast<T>(u64);
}
#elif DAWN_PLATFORM_IS(32_BIT)
#define DAWN_DEFINE_NATIVE_NON_DISPATCHABLE_HANDLE(object) using object = uint64_t;
template <typename T>
T NativeNonDispatachableHandleFromU64(uint64_t u64) {
return u64;
}
#else
#error "Unsupported platform"
#endif
// Define a placeholder Vulkan handle for use before we include vulkan.h
DAWN_DEFINE_NATIVE_NON_DISPATCHABLE_HANDLE(VkSomeHandle)
// Find out the alignment of native handles. Logically we would use alignof(VkSomeHandleNative) so
// why bother with the wrapper struct? It turns out that on Linux Intel x86 alignof(uint64_t) is 8
// but alignof(struct{uint64_t a;}) is 4. This is because this Intel ABI doesn't say anything about
// double-word alignment so for historical reasons compilers violated the standard and use an
// alignment of 4 for uint64_t (and double) inside structures.
// See https://stackoverflow.com/questions/44877185
// One way to get the alignment inside structures of a type is to look at the alignment of it
// wrapped in a structure. Hence VkSameHandleNativeWrappe
namespace dawn::native::vulkan {
namespace detail {
template <typename T>
struct WrapperStruct {
T member;
};
template <typename T>
static constexpr size_t AlignOfInStruct = alignof(WrapperStruct<T>);
static constexpr size_t kNativeVkHandleAlignment = AlignOfInStruct<VkSomeHandle>;
static constexpr size_t kUint64Alignment = AlignOfInStruct<uint64_t>;
// Simple handle types that supports "nullptr_t" as a 0 value.
template <typename Tag, typename HandleType>
class alignas(detail::kNativeVkHandleAlignment) VkHandle {
public:
// Default constructor and assigning of VK_NULL_HANDLE
VkHandle() = default;
VkHandle(std::nullptr_t) {}
// Use default copy constructor/assignment
VkHandle(const VkHandle<Tag, HandleType>& other) = default;
VkHandle& operator=(const VkHandle<Tag, HandleType>&) = default;
// Comparisons between handles
bool operator==(VkHandle<Tag, HandleType> other) const { return mHandle == other.mHandle; }
bool operator!=(VkHandle<Tag, HandleType> other) const { return mHandle != other.mHandle; }
// Comparisons between handles and VK_NULL_HANDLE
bool operator==(std::nullptr_t) const { return mHandle == 0; }
bool operator!=(std::nullptr_t) const { return mHandle != 0; }
// Implicit conversion to real Vulkan types.
operator HandleType() const { return GetHandle(); }
HandleType GetHandle() const { return mHandle; }
HandleType& operator*() { return mHandle; }
static VkHandle<Tag, HandleType> CreateFromHandle(HandleType handle) {
return VkHandle{handle};
}
private:
explicit VkHandle(HandleType handle) : mHandle(handle) {}
HandleType mHandle = 0;
};
} // namespace detail
template <typename Tag, typename HandleType>
HandleType* AsVkArray(detail::VkHandle<Tag, HandleType>* handle) {
return reinterpret_cast<HandleType*>(handle);
}
} // namespace dawn::native::vulkan
#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) \
DAWN_DEFINE_NATIVE_NON_DISPATCHABLE_HANDLE(object) \
namespace dawn::native::vulkan { \
using object = detail::VkHandle<struct VkTag##object, ::object>; \
static_assert(sizeof(object) == sizeof(uint64_t)); \
static_assert(alignof(object) == detail::kUint64Alignment); \
static_assert(sizeof(object) == sizeof(::object)); \
static_assert(alignof(object) == detail::kNativeVkHandleAlignment); \
} // namespace dawn::native::vulkan
// Import additional parts of Vulkan that are supported on our architecture and preemptively include
// headers that vulkan.h includes that we have "undefs" for. Note that some of the VK_USE_PLATFORM_*
// defines are defined already in the Vulkan-Header BUILD.gn, but are needed when building with
// CMake, hence they cannot be removed at the moment.
#if DAWN_PLATFORM_IS(WINDOWS)
#ifndef VK_USE_PLATFORM_WIN32_KHR
#define VK_USE_PLATFORM_WIN32_KHR
#endif
#include "dawn/common/windows_with_undefs.h"
#endif // DAWN_PLATFORM_IS(WINDOWS)
#if defined(DAWN_USE_X11)
#define VK_USE_PLATFORM_XLIB_KHR
#ifndef VK_USE_PLATFORM_XCB_KHR
#define VK_USE_PLATFORM_XCB_KHR
#endif
#include "dawn/common/xlib_with_undefs.h"
#endif // defined(DAWN_USE_X11)
#if defined(DAWN_USE_WAYLAND)
#ifndef VK_USE_PLATFORM_WAYLAND_KHR
#define VK_USE_PLATFORM_WAYLAND_KHR
#endif
#endif // defined(DAWN_USE_WAYLAND)
#if defined(DAWN_ENABLE_BACKEND_METAL)
#ifndef VK_USE_PLATFORM_METAL_EXT
#define VK_USE_PLATFORM_METAL_EXT
#endif
#endif // defined(DAWN_ENABLE_BACKEND_METAL)
#if DAWN_PLATFORM_IS(ANDROID)
#ifndef VK_USE_PLATFORM_ANDROID_KHR
#define VK_USE_PLATFORM_ANDROID_KHR
#endif
#endif // DAWN_PLATFORM_IS(ANDROID)
#if DAWN_PLATFORM_IS(FUCHSIA)
#ifndef VK_USE_PLATFORM_FUCHSIA
#define VK_USE_PLATFORM_FUCHSIA
#endif
#endif // DAWN_PLATFORM_IS(FUCHSIA)
// The actual inclusion of vulkan.h!
#define VK_NO_PROTOTYPES
#include <vulkan/vulkan.h>
// Redefine VK_NULL_HANDLE for better type safety where possible.
#undef VK_NULL_HANDLE
static constexpr std::nullptr_t VK_NULL_HANDLE = nullptr;
#endif // SRC_DAWN_COMMON_VULKAN_PLATFORM_H_