SurfaceD3D.h

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Hash : ecc378cc
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Date : 2025-03-03T16:43:33

Reland "Dont use Subject/Observer for SwapchainImageChanged"

This is reland of the following CL
https://chromium-review.googlesource.com/c/angle/angle/+/6319893

Because we do deferred ANI (VkAcquireNextImage) call until image is
needed, we need a way to force Context to go through
FramebufferVk::syncState call (FramebufferVk::syncState calls
WindowSurfaceVk::getAttachmentRenderTarget, which end up calling ANI.
Right now we uses subject/observer mechanism, by sending
angle::SubjectMessage::SwapchainImageChanged to all observers of
WindowSurfaceVk. In this case it is egl::Surface. Then eglSurface
redirects this message to its observers, which are all gl::Framebuffer's
attachments: color, depth, stencil. Even though only color attachment
needs to be notified, but because we don't have a separate list of
observers, depth/stencil attachment also receive the notification and
they early out. Then gl::Framebuffer sets
DIRTY_BIT_COLOR_BUFFER_CONTENTS_0 dirty bit and send the
angle::SubjectMessage::DirtyBitsFlagged to Context, which dirty DrawFBO
and ReadFBO and dirty cached state. Note that this is specific for swap
image changed case, there is no surface property change (surface
property change will still trigger the subject/observer message with
SubjectMessage::SubjectChanged message, but this occurs rarely). This
gets worse for apps that uses multiple contexts, for the example
pokemon_masters_ex has three contexts, each context has its own default
frame buffer that attach to the same surface, and we never remove
non-current context from the observer list. This end up with
egl::Surface has 12 observers and for every frame, it loop over the list
of 12 observers and send message (virtual function call) to each of
them. Color attachment also ends up sending two messages to Context, one
for Read FBO and another for Draw FBO. There are total 21 virtual
function calls. Even for single context usage, you have 6 virtual
function calls, for every frame.

EGL spec says "an EGLSurface must be current on only one thread at a
time", any other context must call EGLMakeCurrent in order to use this
surface, which will add all necessary dirty bits at that time. So we
really only need to notify current context. In this CL,
SwapchainImageChanged no longer uses subject/observer mechanism, so this
message is removed.

This CL still uses subject/observer mechanism to send DirtyBitsFlagged
from Framebuffer back to context. We could call setDrawFramebufferDirty
and setReadFramebufferDirty directly, but that will require to remove
the "const" decoration out of gl::Context which generates too much code
diff, so onStateChange(angle::SubjectMessage::DirtyBitsFlagged) is still
used.

Bug: angleproject:400711938
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6319893
Commit-Queue: Charlie Lao <cclao@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Yuxin Hu <yuxinhu@google.com>
Change-Id: I017b0e8934b5194a520828fa5c4af1d6e3ef9aac
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6404621

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src/libANGLE/renderer/d3d/SurfaceD3D.h

//
// Copyright 2014 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.
//

// SurfaceD3D.h: D3D implementation of an EGL surface

#ifndef LIBANGLE_RENDERER_D3D_SURFACED3D_H_
#define LIBANGLE_RENDERER_D3D_SURFACED3D_H_

#include "libANGLE/renderer/SurfaceImpl.h"
#include "libANGLE/renderer/d3d/NativeWindowD3D.h"

namespace egl
{
class Surface;
}

namespace rx
{
class DisplayD3D;
class SwapChainD3D;
class RendererD3D;

class SurfaceD3D : public SurfaceImpl
{
  public:
    ~SurfaceD3D() override;
    void releaseSwapChain();

    egl::Error initialize(const egl::Display *display) override;

    egl::Error swap(const gl::Context *context, SurfaceSwapFeedback *feedback) override;
    egl::Error postSubBuffer(const gl::Context *context,
                             EGLint x,
                             EGLint y,
                             EGLint width,
                             EGLint height) override;
    egl::Error querySurfacePointerANGLE(EGLint attribute, void **value) override;
    egl::Error bindTexImage(const gl::Context *context,
                            gl::Texture *texture,
                            EGLint buffer) override;
    egl::Error releaseTexImage(const gl::Context *context, EGLint buffer) override;
    egl::Error getSyncValues(EGLuint64KHR *ust, EGLuint64KHR *msc, EGLuint64KHR *sbc) override;
    egl::Error getMscRate(EGLint *numerator, EGLint *denominator) override;
    void setSwapInterval(const egl::Display *display, EGLint interval) override;
    void setFixedWidth(EGLint width) override;
    void setFixedHeight(EGLint height) override;

    EGLint getWidth() const override;
    EGLint getHeight() const override;

    EGLint isPostSubBufferSupported() const override;
    EGLint getSwapBehavior() const override;

    // D3D implementations
    SwapChainD3D *getSwapChain() const;

    egl::Error resetSwapChain(const egl::Display *display);

    egl::Error checkForOutOfDateSwapChain(DisplayD3D *displayD3D);

    angle::Result getAttachmentRenderTarget(const gl::Context *context,
                                            GLenum binding,
                                            const gl::ImageIndex &imageIndex,
                                            GLsizei samples,
                                            FramebufferAttachmentRenderTarget **rtOut) override;
    angle::Result initializeContents(const gl::Context *context,
                                     GLenum binding,
                                     const gl::ImageIndex &imageIndex) override;

    const angle::Format *getD3DTextureColorFormat() const override;

    egl::Error attachToFramebuffer(const gl::Context *context,
                                   gl::Framebuffer *framebuffer) override;
    egl::Error detachFromFramebuffer(const gl::Context *context,
                                     gl::Framebuffer *framebuffer) override;

  protected:
    SurfaceD3D(const egl::SurfaceState &state,
               RendererD3D *renderer,
               egl::Display *display,
               EGLNativeWindowType window,
               EGLenum buftype,
               EGLClientBuffer clientBuffer,
               const egl::AttributeMap &attribs);

    egl::Error swapRect(DisplayD3D *displayD3D, EGLint x, EGLint y, EGLint width, EGLint height);
    egl::Error resetSwapChain(DisplayD3D *displayD3D, int backbufferWidth, int backbufferHeight);
    egl::Error resizeSwapChain(DisplayD3D *displayD3D, int backbufferWidth, int backbufferHeight);

    RendererD3D *mRenderer;
    egl::Display *mDisplay;

    bool mFixedSize;
    GLint mFixedWidth;
    GLint mFixedHeight;
    GLint mOrientation;

    GLenum mRenderTargetFormat;
    GLenum mDepthStencilFormat;
    const angle::Format *mColorFormat;

    SwapChainD3D *mSwapChain;
    bool mSwapIntervalDirty;

    NativeWindowD3D *mNativeWindow;  // Handler for the Window that the surface is created for.
    EGLint mWidth;
    EGLint mHeight;

    EGLint mSwapInterval;

    HANDLE mShareHandle;
    IUnknown *mD3DTexture;

    EGLenum mBuftype;
};

class WindowSurfaceD3D : public SurfaceD3D
{
  public:
    WindowSurfaceD3D(const egl::SurfaceState &state,
                     RendererD3D *renderer,
                     egl::Display *display,
                     EGLNativeWindowType window,
                     const egl::AttributeMap &attribs);
    ~WindowSurfaceD3D() override;
};

class PbufferSurfaceD3D : public SurfaceD3D
{
  public:
    PbufferSurfaceD3D(const egl::SurfaceState &state,
                      RendererD3D *renderer,
                      egl::Display *display,
                      EGLenum buftype,
                      EGLClientBuffer clientBuffer,
                      const egl::AttributeMap &attribs);
    ~PbufferSurfaceD3D() override;
};

}  // namespace rx

#endif  // LIBANGLE_RENDERER_D3D_SURFACED3D_H_

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