src/dawn/native/Surface.h

// Copyright 2020 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
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//    this list of conditions and the following disclaimer in the documentation
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#ifndef SRC_DAWN_NATIVE_SURFACE_H_
#define SRC_DAWN_NATIVE_SURFACE_H_

#include <memory>
#include <string>

#include "dawn/native/Error.h"
#include "dawn/native/Forward.h"
#include "dawn/native/ObjectBase.h"
#include "partition_alloc/pointers/raw_ptr.h"

#include "dawn/native/dawn_platform.h"

#include "dawn/common/Platform.h"

#if DAWN_PLATFORM_IS(WINDOWS)
#include "dawn/native/d3d/d3d_platform.h"
#endif  // DAWN_PLATFORM_IS(WINDOWS)

// Forward declare IUnknown
// GetCoreWindow needs to return an IUnknown pointer
// non-windows platforms don't have this type
struct IUnknown;

namespace dawn::native {

struct PhysicalDeviceSurfaceCapabilities;

// Adapter surface capabilities are cached by the surface
class AdapterSurfaceCapCache;

ResultOrError<UnpackedPtr<SurfaceDescriptor>> ValidateSurfaceDescriptor(
    InstanceBase* instance,
    const SurfaceDescriptor* rawDescriptor);

MaybeError ValidateSurfaceConfiguration(DeviceBase* device,
                                        const PhysicalDeviceSurfaceCapabilities& capabilities,
                                        const SurfaceConfiguration* config,
                                        const Surface* surface);

// A surface is a sum types of all the kind of windows Dawn supports. The OS-specific types
// aren't used because they would cause compilation errors on other OSes (or require
// ObjectiveC).
// The surface is also used to store the current swapchain so that we can detach it when it is
// replaced.
class Surface final : public ErrorMonad {
  public:
    static Ref<Surface> MakeError(InstanceBase* instance);

    Surface(InstanceBase* instance, const UnpackedPtr<SurfaceDescriptor>& descriptor);

    // These are valid to call on all Surfaces.
    enum class Type {
        AndroidWindow,
        MetalLayer,
        WaylandSurface,
        WindowsHWND,
        WindowsCoreWindow,
        WindowsSwapChainPanel,
        XlibWindow,
    };
    Type GetType() const;
    InstanceBase* GetInstance() const;
    DeviceBase* GetCurrentDevice() const;

    // Valid to call if the type is MetalLayer
    void* GetMetalLayer() const;

    // Valid to call if the type is Android
    void* GetAndroidNativeWindow() const;

    // Valid to call if the type is WaylandSurface
    void* GetWaylandDisplay() const;
    void* GetWaylandSurface() const;

    // Valid to call if the type is WindowsHWND
    void* GetHInstance() const;
    void* GetHWND() const;

    // Valid to call if the type is WindowsCoreWindow
    IUnknown* GetCoreWindow() const;

    // Valid to call if the type is WindowsSwapChainPanel
    IUnknown* GetSwapChainPanel() const;

    // Valid to call if the type is WindowsXlib
    void* GetXDisplay() const;
    uint32_t GetXWindow() const;

    // TODO(dawn:2320) Remove these 2 accessors once the deprecation period is finished and
    // Device::APICreateSwapChain gets dropped
    SwapChainBase* GetAttachedSwapChain();
    void SetAttachedSwapChain(SwapChainBase* swapChain);

    const std::string& GetLabel() const;

    // Dawn API
    void APIConfigure(const SurfaceConfiguration* config);
    void APIGetCapabilities(AdapterBase* adapter, SurfaceCapabilities* capabilities) const;
    void APIGetCurrentTexture(SurfaceTexture* surfaceTexture) const;
    wgpu::TextureFormat APIGetPreferredFormat(AdapterBase* adapter) const;
    void APIPresent();
    void APIUnconfigure();
    void APISetLabel(const char* label);

  private:
    Surface(InstanceBase* instance, ErrorMonad::ErrorTag tag);
    ~Surface() override;

    MaybeError Configure(const SurfaceConfiguration* config);
    MaybeError Unconfigure();

    MaybeError GetCapabilities(AdapterBase* adapter, SurfaceCapabilities* capabilities) const;
    MaybeError GetCurrentTexture(SurfaceTexture* surfaceTexture) const;
    ResultOrError<wgpu::TextureFormat> GetPreferredFormat(AdapterBase* adapter) const;
    MaybeError Present();

    Ref<InstanceBase> mInstance;
    Type mType;
    std::string mLabel;

    // The surface has an associated device only when it is configured
    Ref<DeviceBase> mCurrentDevice;

    // The swapchain is created when configuring the surface.
    Ref<SwapChainBase> mSwapChain;

    // We keep on storing the previous swap chain after Unconfigure in case we could reuse it
    Ref<SwapChainBase> mRecycledSwapChain;

    // This ensures that the user does not mix the legacy API (ManagesSwapChain::No, i.e., explicit
    // call to CreateSwapChain) with the new API (ManagesSwapChain::Yes, i.e., surface.configure).
    // TODO(dawn:2320) Remove and consider it is always Yes once Device::APICreateSwapChain gets
    // dropped
    enum class ManagesSwapChain {
        Yes,
        No,
        Unknown,
    };
    ManagesSwapChain mIsSwapChainManagedBySurface = ManagesSwapChain::Unknown;

    // A cache is mutable because potentially modified in const-qualified getters
    std::unique_ptr<AdapterSurfaceCapCache> mCapabilityCache;

    // MetalLayer
    raw_ptr<void> mMetalLayer = nullptr;

    // ANativeWindow
    raw_ptr<void> mAndroidNativeWindow = nullptr;

    // Wayland
    raw_ptr<void> mWaylandDisplay = nullptr;
    raw_ptr<void> mWaylandSurface = nullptr;

    // WindowsHwnd
    raw_ptr<void> mHInstance = nullptr;
    raw_ptr<void> mHWND = nullptr;

#if defined(DAWN_USE_WINDOWS_UI)
    // WindowsCoreWindow
    ComPtr<IUnknown> mCoreWindow;

    // WindowsSwapChainPanel
    ComPtr<IUnknown> mSwapChainPanel;
#endif  // defined(DAWN_USE_WINDOWS_UI)

    // Xlib
    raw_ptr<void> mXDisplay = nullptr;
    uint32_t mXWindow = 0;
};

// Not defined in webgpu_absl_format.h/cpp because you can't forward-declare a nested type.
absl::FormatConvertResult<absl::FormatConversionCharSet::kString>
AbslFormatConvert(Surface::Type value, const absl::FormatConversionSpec& spec, absl::FormatSink* s);

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_SURFACE_H_