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Accelerated Canvas2D and WebGL both live within the GPU process and run within the same thread. We want to avoid any kind of readbacks from the GPU process to the content process when doing a drawImage of a WebGL context to an AC2D canvas. To achieve this, we pause the AC2D recording translation with an AwaitTranslationSync event identified by a sync-id. Then we send a request over IPDL to snapshot the WebGL context while this pause is ongoing via a SnapshotExternalCanvas IPDL message, which uses the sync-id to identify the snapshot safely in a table of such external snapshots and force translation to resume. Finally, we send a ResolveExternalSnapshot event within the recording stream to lookup the snapshot based on the sync-id and assign it an alias that can be used within the recording stream playback for drawImage. The sync-id mechanism acts as a sequenced fence so that multiple SnapshotExternalCanvas requests can be encountered simultaneously from IPDL without confusing the recording playback. Differential Revision: https://phabricator.services.mozilla.com/D243399
135 lines
5.3 KiB
C++
135 lines
5.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef WEBGLPARENT_H_
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#define WEBGLPARENT_H_
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#include "mozilla/GfxMessageUtils.h"
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#include "mozilla/dom/ipc/IdType.h"
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#include "mozilla/dom/PWebGLParent.h"
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#include "mozilla/WeakPtr.h"
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namespace mozilla {
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class HostWebGLContext;
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class WebGLChild;
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namespace layers {
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class SharedSurfacesHolder;
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class SharedSurfaceTextureClient;
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class SurfaceDescriptor;
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} // namespace layers
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namespace dom {
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class WebGLParent : public PWebGLParent, public SupportsWeakPtr {
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friend PWebGLParent;
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WebGLParent, override);
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mozilla::ipc::IPCResult RecvInitialize(const webgl::InitContextDesc&,
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webgl::InitContextResult* out);
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WebGLParent(layers::SharedSurfacesHolder* aSharedSurfacesHolder,
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const dom::ContentParentId& aContentId); // For IPDL
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using IPCResult = mozilla::ipc::IPCResult;
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template <class ResolveT>
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IPCResult RecvPing(const ResolveT& Resolve) {
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Resolve(void_t{});
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return IPC_OK();
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}
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IPCResult RecvSyncPing() { return IPC_OK(); }
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IPCResult RecvDispatchCommands(mozilla::ipc::BigBuffer&&, uint64_t);
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IPCResult RecvTexImage(uint32_t level, uint32_t respecFormat,
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const uvec3& offset, const webgl::PackingInfo&,
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webgl::TexUnpackBlobDesc&&);
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IPCResult RecvGetBufferSubData(GLenum target, uint64_t srcByteOffset,
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uint64_t byteSize, mozilla::ipc::Shmem* ret);
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IPCResult GetFrontBufferSnapshot(webgl::FrontBufferSnapshotIpc* ret,
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IProtocol* aProtocol);
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IPCResult RecvGetFrontBufferSnapshot(webgl::FrontBufferSnapshotIpc* ret);
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IPCResult RecvReadPixels(const webgl::ReadPixelsDesc&,
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ReadPixelsBuffer&& buffer,
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webgl::ReadPixelsResultIpc* ret);
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// -
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using ObjectId = webgl::ObjectId;
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IPCResult RecvCheckFramebufferStatus(GLenum target, GLenum* ret);
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IPCResult RecvClientWaitSync(ObjectId id, GLbitfield flags, GLuint64 timeout,
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GLenum* ret);
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IPCResult RecvCreateOpaqueFramebuffer(ObjectId id,
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const OpaqueFramebufferOptions&,
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bool* ret);
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IPCResult RecvDrawingBufferSize(uvec2* ret);
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IPCResult RecvFinish();
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IPCResult RecvGetBufferParameter(GLenum target, GLenum pname,
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Maybe<double>* ret);
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IPCResult RecvGetCompileResult(ObjectId id, webgl::CompileResult* ret);
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IPCResult RecvGetError(GLenum* ret);
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IPCResult RecvGetFragDataLocation(ObjectId id, const std::string& name,
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GLint* ret);
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IPCResult RecvGetFramebufferAttachmentParameter(ObjectId id,
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GLenum attachment,
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GLenum pname,
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Maybe<double>* ret);
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IPCResult RecvGetFrontBuffer(ObjectId fb, bool vr,
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Maybe<layers::SurfaceDescriptor>* ret);
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IPCResult RecvGetIndexedParameter(GLenum target, GLuint index,
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Maybe<double>* ret);
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IPCResult RecvGetInternalformatParameter(GLenum target, GLuint format,
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GLuint pname,
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Maybe<std::vector<int32_t>>* ret);
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IPCResult RecvGetLinkResult(ObjectId id, webgl::LinkResult* ret);
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IPCResult RecvGetNumber(GLenum pname, Maybe<double>* ret);
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IPCResult RecvGetQueryParameter(ObjectId id, GLenum pname,
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Maybe<double>* ret);
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IPCResult RecvGetRenderbufferParameter(ObjectId id, GLenum pname,
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Maybe<double>* ret);
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IPCResult RecvGetSamplerParameter(ObjectId id, GLenum pname,
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Maybe<double>* ret);
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IPCResult RecvGetString(GLenum pname, Maybe<std::string>* ret);
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IPCResult RecvGetTexParameter(ObjectId id, GLenum pname, Maybe<double>* ret);
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IPCResult RecvGetUniform(ObjectId id, uint32_t loc,
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webgl::GetUniformData* ret);
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IPCResult RecvGetVertexAttrib(GLuint index, GLenum pname, Maybe<double>* ret);
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IPCResult RecvOnMemoryPressure();
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IPCResult RecvValidateProgram(ObjectId id, bool* ret);
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// -
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const RefPtr<layers::SharedSurfacesHolder> mSharedSurfacesHolder;
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const dom::ContentParentId mContentId;
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HostWebGLContext* GetHostWebGLContext() const { return mHost.get(); }
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private:
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~WebGLParent();
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mozilla::ipc::IPCResult Recv__delete__() override;
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void ActorDestroy(ActorDestroyReason aWhy) override;
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mozilla::ipc::IPCResult RecvWaitForTxn(layers::RemoteTextureOwnerId aOwnerId,
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layers::RemoteTextureTxnType aTxnType,
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layers::RemoteTextureTxnId aTxnId);
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std::unique_ptr<HostWebGLContext> mHost;
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// Runnable that repeatedly processes our WebGL command queue
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RefPtr<Runnable> mRunCommandsRunnable;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // WEBGLPARENT_H_
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