Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 800 insertions, 0 deletions

diff --git a/dom/canvas/HostWebGLContext.h b/dom/canvas/HostWebGLContext.h
new file mode 100644
index 0000000000..3532603d99
--- /dev/null
+++ b/dom/canvas/HostWebGLContext.h
@@ -0,0 +1,800 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef HOSTWEBGLCONTEXT_H_
+#define HOSTWEBGLCONTEXT_H_
+
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/GfxMessageUtils.h"
+#include "ClientWebGLContext.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/UniquePtr.h"
+#include "GLContext.h"
+#include "WebGLContext.h"
+#include "WebGL2Context.h"
+#include "WebGLFramebuffer.h"
+#include "WebGLTypes.h"
+#include "WebGLCommandQueue.h"
+
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+namespace mozilla {
+
+namespace dom {
+class WebGLParent;
+}
+namespace layers {
+class CompositableHost;
+}
+
+struct LockedOutstandingContexts final {
+ private:
+  // StaticMutexAutoLock lock; // We can't use it directly (STACK_CLASS), but
+  // this is effectively what we hold via RAII.
+
+ public:
+  const std::unordered_set<HostWebGLContext*>& contexts;
+
+  LockedOutstandingContexts();
+  ~LockedOutstandingContexts();
+};
+
+/**
+ * Host endpoint of a WebGLContext.  HostWebGLContext owns a WebGLContext
+ * that it uses to execute commands sent from its ClientWebGLContext.
+ *
+ * A HostWebGLContext continuously issues a Task to the Compositor thread that
+ * causes it to drain its queue of commands.  It also maintains a map of WebGL
+ * objects (e.g. ObjectIdMap<WebGLShader>) that it uses associate them with
+ * their cross-process IDs.
+ *
+ * This class is not an implementation of the
+ * nsICanvasRenderingContextInternal DOM class.  That is the
+ * ClientWebGLContext.
+ */
+class HostWebGLContext final : public SupportsWeakPtr {
+  friend class WebGLContext;
+  friend class WebGLMemoryTracker;
+  friend class dom::WebGLParent;
+
+  using ObjectId = webgl::ObjectId;
+
+  static std::unique_ptr<LockedOutstandingContexts> OutstandingContexts() {
+    return std::make_unique<LockedOutstandingContexts>();
+  }
+
+ public:
+  struct OwnerData final {
+    ClientWebGLContext* inProcess = nullptr;
+    dom::WebGLParent* outOfProcess = nullptr;
+  };
+
+  static UniquePtr<HostWebGLContext> Create(const OwnerData&,
+                                            const webgl::InitContextDesc&,
+                                            webgl::InitContextResult* out);
+
+ private:
+  explicit HostWebGLContext(const OwnerData&);
+
+ public:
+  virtual ~HostWebGLContext();
+
+  WebGLContext* GetWebGLContext() const { return mContext; }
+
+ public:
+  const OwnerData mOwnerData;
+
+ private:
+  RefPtr<WebGLContext> mContext;
+
+#define _(X) std::unordered_map<ObjectId, RefPtr<WebGL##X>> m##X##Map;
+
+  _(Buffer)
+  _(Framebuffer)
+  _(Program)
+  _(Query)
+  _(Renderbuffer)
+  _(Sampler)
+  _(Shader)
+  _(Sync)
+  _(Texture)
+  _(TransformFeedback)
+  _(VertexArray)
+
+#undef _
+
+  class AutoResolveT final {
+    friend class HostWebGLContext;
+
+    const HostWebGLContext& mParent;
+    const ObjectId mId;
+
+   public:
+    AutoResolveT(const HostWebGLContext& parent, const ObjectId id)
+        : mParent(parent), mId(id) {}
+
+#define _(X)                                              \
+  WebGL##X* As(WebGL##X*) const {                         \
+    const auto maybe = MaybeFind(mParent.m##X##Map, mId); \
+    if (!maybe) return nullptr;                           \
+    return maybe->get();                                  \
+  }
+
+    _(Buffer)
+    _(Framebuffer)
+    _(Program)
+    _(Query)
+    _(Renderbuffer)
+    _(Sampler)
+    _(Shader)
+    _(Sync)
+    _(Texture)
+    _(TransformFeedback)
+    _(VertexArray)
+
+#undef _
+    template <typename T>
+    MOZ_IMPLICIT operator T*() const {
+      T* coercer = nullptr;
+      return As(coercer);
+    }
+
+    template <typename T>
+    MOZ_IMPLICIT operator const T*() const {
+      T* coercer = nullptr;
+      return As(coercer);
+    }
+  };
+
+  AutoResolveT AutoResolve(const ObjectId id) const { return {*this, id}; }
+  template <typename T>
+  T* ById(const ObjectId id) const {
+    T* coercer = nullptr;
+    return AutoResolve(id).As(coercer);
+  }
+
+  // -------------------------------------------------------------------------
+  // Host-side methods.  Calls in the client are forwarded to the host.
+  // -------------------------------------------------------------------------
+
+ public:
+  // ------------------------- Composition -------------------------
+
+  void SetCompositableHost(RefPtr<layers::CompositableHost>& compositableHost) {
+    mContext->SetCompositableHost(compositableHost);
+  }
+
+  void Present(const ObjectId xrFb, const layers::TextureType t,
+               const bool webvr, const webgl::SwapChainOptions& options) const {
+    return (void)mContext->Present(AutoResolve(xrFb), t, webvr, options);
+  }
+  void CopyToSwapChain(const ObjectId fb, const layers::TextureType t,
+                       const webgl::SwapChainOptions& options) const {
+    return (void)mContext->CopyToSwapChain(AutoResolve(fb), t, options);
+  }
+  void EndOfFrame() const { return (void)mContext->EndOfFrame(); }
+  Maybe<layers::SurfaceDescriptor> GetFrontBuffer(ObjectId xrFb,
+                                                  const bool webvr) const;
+
+  // -
+
+  Maybe<uvec2> FrontBufferSnapshotInto(Maybe<Range<uint8_t>> dest) const {
+    return mContext->FrontBufferSnapshotInto(dest);
+  }
+
+  Maybe<uvec2> FrontBufferSnapshotInto(
+      std::shared_ptr<gl::SharedSurface>& front,
+      Maybe<Range<uint8_t>> dest) const {
+    return mContext->FrontBufferSnapshotInto(front, dest);
+  }
+
+  void ClearVRSwapChain() const { mContext->ClearVRSwapChain(); }
+
+  // -
+
+  void Resize(const uvec2& size) { return mContext->Resize(size); }
+
+  uvec2 DrawingBufferSize() { return mContext->DrawingBufferSize(); }
+
+  void OnMemoryPressure() { return mContext->OnMemoryPressure(); }
+
+  void DidRefresh() { mContext->DidRefresh(); }
+
+  void GenerateError(const GLenum error, const std::string& text) const {
+    mContext->GenerateErrorImpl(error, text);
+  }
+
+  void OnContextLoss(webgl::ContextLossReason);
+
+  void RequestExtension(const WebGLExtensionID ext) {
+    mContext->RequestExtension(ext);
+  }
+
+  // -
+  // Child-ward
+
+  void JsWarning(const std::string&) const;
+
+  // -
+  // Creation and destruction
+
+  void CreateBuffer(ObjectId);
+  void CreateFramebuffer(ObjectId);
+  bool CreateOpaqueFramebuffer(ObjectId,
+                               const webgl::OpaqueFramebufferOptions& options);
+  void CreateProgram(ObjectId);
+  void CreateQuery(ObjectId);
+  void CreateRenderbuffer(ObjectId);
+  void CreateSampler(ObjectId);
+  void CreateShader(ObjectId, GLenum type);
+  void CreateSync(ObjectId);
+  void CreateTexture(ObjectId);
+  void CreateTransformFeedback(ObjectId);
+  void CreateVertexArray(ObjectId);
+
+  void DeleteBuffer(ObjectId);
+  void DeleteFramebuffer(ObjectId);
+  void DeleteProgram(ObjectId);
+  void DeleteQuery(ObjectId);
+  void DeleteRenderbuffer(ObjectId);
+  void DeleteSampler(ObjectId);
+  void DeleteShader(ObjectId);
+  void DeleteSync(ObjectId);
+  void DeleteTexture(ObjectId);
+  void DeleteTransformFeedback(ObjectId);
+  void DeleteVertexArray(ObjectId);
+
+  // ------------------------- GL State -------------------------
+  bool IsContextLost() const { return mContext->IsContextLost(); }
+
+  void SetEnabled(GLenum cap, Maybe<GLuint> i, bool val) const {
+    mContext->SetEnabled(cap, i, val);
+  }
+
+  bool IsEnabled(GLenum cap) const { return mContext->IsEnabled(cap); }
+
+  Maybe<double> GetNumber(GLenum pname) const {
+    return mContext->GetParameter(pname);
+  }
+
+  Maybe<std::string> GetString(GLenum pname) const {
+    return mContext->GetString(pname);
+  }
+
+  void AttachShader(ObjectId prog, ObjectId shader) const {
+    const auto pProg = ById<WebGLProgram>(prog);
+    const auto pShader = ById<WebGLShader>(shader);
+    if (!pProg || !pShader) return;
+    mContext->AttachShader(*pProg, *pShader);
+  }
+
+  void BindAttribLocation(ObjectId id, GLuint location,
+                          const std::string& name) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return;
+    mContext->BindAttribLocation(*obj, location, name);
+  }
+
+  void BindFramebuffer(GLenum target, ObjectId id) const {
+    mContext->BindFramebuffer(target, AutoResolve(id));
+  }
+
+  void BlendColor(GLclampf r, GLclampf g, GLclampf b, GLclampf a) const {
+    mContext->BlendColor(r, g, b, a);
+  }
+
+  void BlendEquationSeparate(Maybe<GLuint> i, GLenum modeRGB,
+                             GLenum modeAlpha) const {
+    mContext->BlendEquationSeparate(i, modeRGB, modeAlpha);
+  }
+
+  void BlendFuncSeparate(Maybe<GLuint> i, GLenum srcRGB, GLenum dstRGB,
+                         GLenum srcAlpha, GLenum dstAlpha) const {
+    mContext->BlendFuncSeparate(i, srcRGB, dstRGB, srcAlpha, dstAlpha);
+  }
+
+  GLenum CheckFramebufferStatus(GLenum target) const {
+    return mContext->CheckFramebufferStatus(target);
+  }
+
+  void Clear(GLbitfield mask) const { mContext->Clear(mask); }
+
+  void ClearColor(GLclampf r, GLclampf g, GLclampf b, GLclampf a) const {
+    mContext->ClearColor(r, g, b, a);
+  }
+
+  void ClearDepth(GLclampf v) const { mContext->ClearDepth(v); }
+
+  void ClearStencil(GLint v) const { mContext->ClearStencil(v); }
+
+  void ColorMask(Maybe<GLuint> i, uint8_t mask) const {
+    mContext->ColorMask(i, mask);
+  }
+
+  void CompileShader(const ObjectId id) const {
+    const auto obj = ById<WebGLShader>(id);
+    if (!obj) return;
+    mContext->CompileShader(*obj);
+  }
+
+  void CullFace(GLenum face) const { mContext->CullFace(face); }
+
+  void DepthFunc(GLenum func) const { mContext->DepthFunc(func); }
+
+  void DepthMask(WebGLboolean b) const { mContext->DepthMask(b); }
+
+  void DepthRange(GLclampf zNear, GLclampf zFar) const {
+    mContext->DepthRange(zNear, zFar);
+  }
+
+  void DetachShader(const ObjectId prog, const ObjectId shader) const {
+    const auto pProg = ById<WebGLProgram>(prog);
+    const auto pShader = ById<WebGLShader>(shader);
+    if (!pProg || !pShader) return;
+    mContext->DetachShader(*pProg, *pShader);
+  }
+
+  void Flush() const { mContext->Flush(); }
+
+  void Finish() const { mContext->Finish(); }
+
+  void FramebufferAttach(const GLenum target, const GLenum attachSlot,
+                         const GLenum bindImageTarget, const ObjectId id,
+                         const GLint mipLevel, const GLint zLayerBase,
+                         const GLsizei numViewLayers) const {
+    webgl::FbAttachInfo toAttach;
+    toAttach.rb = AutoResolve(id);
+    toAttach.tex = AutoResolve(id);
+    toAttach.mipLevel = mipLevel;
+    toAttach.zLayer = zLayerBase;
+    if (numViewLayers) {
+      toAttach.zLayerCount = numViewLayers;
+      toAttach.isMultiview = true;
+    }
+
+    mContext->FramebufferAttach(target, attachSlot, bindImageTarget, toAttach);
+  }
+
+  void FrontFace(GLenum mode) const { mContext->FrontFace(mode); }
+
+  Maybe<double> GetBufferParameter(GLenum target, GLenum pname) const {
+    return mContext->GetBufferParameter(target, pname);
+  }
+
+  webgl::CompileResult GetCompileResult(ObjectId id) const {
+    const auto obj = ById<WebGLShader>(id);
+    if (!obj) return {};
+    return mContext->GetCompileResult(*obj);
+  }
+
+  GLenum GetError() const { return mContext->GetError(); }
+
+  GLint GetFragDataLocation(ObjectId id, const std::string& name) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return -1;
+    return mContext->GetFragDataLocation(*obj, name);
+  }
+
+  Maybe<double> GetFramebufferAttachmentParameter(ObjectId id,
+                                                  GLenum attachment,
+                                                  GLenum pname) const {
+    return mContext->GetFramebufferAttachmentParameter(AutoResolve(id),
+                                                       attachment, pname);
+  }
+
+  webgl::LinkResult GetLinkResult(ObjectId id) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return {};
+    return mContext->GetLinkResult(*obj);
+  }
+
+  Maybe<double> GetRenderbufferParameter(ObjectId id, GLenum pname) const {
+    const auto obj = ById<WebGLRenderbuffer>(id);
+    if (!obj) return {};
+    return mContext->GetRenderbufferParameter(*obj, pname);
+  }
+
+  Maybe<webgl::ShaderPrecisionFormat> GetShaderPrecisionFormat(
+      GLenum shaderType, GLenum precisionType) const {
+    return mContext->GetShaderPrecisionFormat(shaderType, precisionType);
+  }
+
+  webgl::GetUniformData GetUniform(ObjectId id, uint32_t loc) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return {};
+    return mContext->GetUniform(*obj, loc);
+  }
+
+  void Hint(GLenum target, GLenum mode) const { mContext->Hint(target, mode); }
+
+  void LineWidth(GLfloat width) const { mContext->LineWidth(width); }
+
+  void LinkProgram(const ObjectId id) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return;
+    mContext->LinkProgram(*obj);
+  }
+
+  void PolygonOffset(GLfloat factor, GLfloat units) const {
+    mContext->PolygonOffset(factor, units);
+  }
+
+  void SampleCoverage(GLclampf value, bool invert) const {
+    mContext->SampleCoverage(value, invert);
+  }
+
+  void Scissor(GLint x, GLint y, GLsizei width, GLsizei height) const {
+    mContext->Scissor(x, y, width, height);
+  }
+
+  // TODO: s/nsAString/std::string/
+  void ShaderSource(const ObjectId id, const std::string& source) const {
+    const auto obj = ById<WebGLShader>(id);
+    if (!obj) return;
+    mContext->ShaderSource(*obj, source);
+  }
+
+  void StencilFuncSeparate(GLenum face, GLenum func, GLint ref,
+                           GLuint mask) const {
+    mContext->StencilFuncSeparate(face, func, ref, mask);
+  }
+  void StencilMaskSeparate(GLenum face, GLuint mask) const {
+    mContext->StencilMaskSeparate(face, mask);
+  }
+  void StencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail,
+                         GLenum dppass) const {
+    mContext->StencilOpSeparate(face, sfail, dpfail, dppass);
+  }
+
+  void Viewport(GLint x, GLint y, GLsizei width, GLsizei height) const {
+    mContext->Viewport(x, y, width, height);
+  }
+
+  // ------------------------- Buffer Objects -------------------------
+  void BindBuffer(GLenum target, const ObjectId id) const {
+    mContext->BindBuffer(target, AutoResolve(id));
+  }
+
+  void BindBufferRange(GLenum target, GLuint index, const ObjectId id,
+                       uint64_t offset, uint64_t size) const {
+    GetWebGL2Context()->BindBufferRange(target, index, AutoResolve(id), offset,
+                                        size);
+  }
+
+  void CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
+                         uint64_t readOffset, uint64_t writeOffset,
+                         uint64_t size) const {
+    GetWebGL2Context()->CopyBufferSubData(readTarget, writeTarget, readOffset,
+                                          writeOffset, size);
+  }
+
+  bool GetBufferSubData(GLenum target, uint64_t srcByteOffset,
+                        const Range<uint8_t>& dest) const {
+    return GetWebGL2Context()->GetBufferSubData(target, srcByteOffset, dest);
+  }
+
+  void BufferData(GLenum target, const RawBuffer<>& data, GLenum usage) const {
+    const auto& beginOrNull = data.begin();
+    mContext->BufferData(target, data.size(), beginOrNull, usage);
+  }
+
+  void BufferSubData(GLenum target, uint64_t dstByteOffset,
+                     const RawBuffer<>& srcData,
+                     bool unsynchronized = false) const {
+    const auto& range = srcData.Data();
+    mContext->BufferSubData(target, dstByteOffset, range.length(),
+                            range.begin().get(), unsynchronized);
+  }
+
+  // -------------------------- Framebuffer Objects --------------------------
+  void BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
+                       GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
+                       GLbitfield mask, GLenum filter) const {
+    GetWebGL2Context()->BlitFramebuffer(srcX0, srcY0, srcX1, srcY1, dstX0,
+                                        dstY0, dstX1, dstY1, mask, filter);
+  }
+
+  void InvalidateFramebuffer(GLenum target,
+                             const RawBuffer<const GLenum>& attachments) const {
+    GetWebGL2Context()->InvalidateFramebuffer(target, MakeRange(attachments));
+  }
+
+  void InvalidateSubFramebuffer(GLenum target,
+                                const RawBuffer<const GLenum>& attachments,
+                                GLint x, GLint y, GLsizei width,
+                                GLsizei height) const {
+    GetWebGL2Context()->InvalidateSubFramebuffer(target, MakeRange(attachments),
+                                                 x, y, width, height);
+  }
+
+  void ReadBuffer(GLenum mode) const { GetWebGL2Context()->ReadBuffer(mode); }
+
+  // ----------------------- Renderbuffer objects -----------------------
+  Maybe<std::vector<int32_t>> GetInternalformatParameter(GLenum target,
+                                                         GLenum internalformat,
+                                                         GLenum pname) const {
+    return GetWebGL2Context()->GetInternalformatParameter(
+        target, internalformat, pname);
+  }
+
+  void RenderbufferStorageMultisample(ObjectId id, uint32_t samples,
+                                      GLenum internalFormat, uint32_t width,
+                                      uint32_t height) const {
+    const auto obj = ById<WebGLRenderbuffer>(id);
+    if (!obj) return;
+    mContext->RenderbufferStorageMultisample(*obj, samples, internalFormat,
+                                             width, height);
+  }
+
+  // --------------------------- Texture objects ---------------------------
+  void ActiveTexture(uint32_t texUnit) const {
+    mContext->ActiveTexture(texUnit);
+  }
+
+  void BindTexture(GLenum texTarget, const ObjectId id) const {
+    mContext->BindTexture(texTarget, AutoResolve(id));
+  }
+
+  void GenerateMipmap(GLenum texTarget) const {
+    mContext->GenerateMipmap(texTarget);
+  }
+
+  // CompressedTexSubImage if `sub`
+  void CompressedTexImage(bool sub, GLenum imageTarget, uint32_t level,
+                          GLenum format, const uvec3& offset, const uvec3& size,
+                          const RawBuffer<>& src, const uint32_t pboImageSize,
+                          const Maybe<uint64_t>& pboOffset) const {
+    mContext->CompressedTexImage(sub, imageTarget, level, format, offset, size,
+                                 MakeRange(src), pboImageSize, pboOffset);
+  }
+
+  // CopyTexSubImage if `!respecFormat`
+  void CopyTexImage(GLenum imageTarget, uint32_t level, GLenum respecFormat,
+                    const uvec3& dstOffset, const ivec2& srcOffset,
+                    const uvec2& size) const {
+    mContext->CopyTexImage(imageTarget, level, respecFormat, dstOffset,
+                           srcOffset, size);
+  }
+
+  // TexSubImage if `!respecFormat`
+  void TexImage(uint32_t level, GLenum respecFormat, const uvec3& offset,
+                const webgl::PackingInfo& pi,
+                const webgl::TexUnpackBlobDesc& src) const {
+    mContext->TexImage(level, respecFormat, offset, pi, src);
+  }
+
+  void TexStorage(GLenum texTarget, uint32_t levels, GLenum internalFormat,
+                  const uvec3& size) const {
+    GetWebGL2Context()->TexStorage(texTarget, levels, internalFormat, size);
+  }
+
+  Maybe<double> GetTexParameter(ObjectId id, GLenum pname) const {
+    const auto obj = ById<WebGLTexture>(id);
+    if (!obj) return {};
+    return mContext->GetTexParameter(*obj, pname);
+  }
+
+  void TexParameter_base(GLenum texTarget, GLenum pname,
+                         const FloatOrInt& param) const {
+    mContext->TexParameter_base(texTarget, pname, param);
+  }
+
+  // ------------------- Programs and shaders --------------------------------
+  void UseProgram(ObjectId id) const { mContext->UseProgram(AutoResolve(id)); }
+
+  bool ValidateProgram(ObjectId id) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return false;
+    return mContext->ValidateProgram(*obj);
+  }
+
+  // ------------------------ Uniforms and attributes ------------------------
+
+  void UniformData(uint32_t loc, bool transpose,
+                   const RawBuffer<webgl::UniformDataVal>& data) const {
+    mContext->UniformData(loc, transpose, data.Data());
+  }
+
+  void VertexAttrib4T(GLuint index, const webgl::TypedQuad& data) const {
+    mContext->VertexAttrib4T(index, data);
+  }
+
+  void VertexAttribDivisor(GLuint index, GLuint divisor) const {
+    mContext->VertexAttribDivisor(index, divisor);
+  }
+
+  Maybe<double> GetIndexedParameter(GLenum target, GLuint index) const {
+    return GetWebGL2Context()->GetIndexedParameter(target, index);
+  }
+
+  void UniformBlockBinding(const ObjectId id, GLuint uniformBlockIndex,
+                           GLuint uniformBlockBinding) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return;
+    GetWebGL2Context()->UniformBlockBinding(*obj, uniformBlockIndex,
+                                            uniformBlockBinding);
+  }
+
+  void EnableVertexAttribArray(GLuint index) const {
+    mContext->EnableVertexAttribArray(index);
+  }
+
+  void DisableVertexAttribArray(GLuint index) const {
+    mContext->DisableVertexAttribArray(index);
+  }
+
+  Maybe<double> GetVertexAttrib(GLuint index, GLenum pname) const {
+    return mContext->GetVertexAttrib(index, pname);
+  }
+
+  void VertexAttribPointer(GLuint index,
+                           const webgl::VertAttribPointerDesc& desc) const {
+    mContext->VertexAttribPointer(index, desc);
+  }
+
+  // --------------------------- Buffer Operations --------------------------
+  void ClearBufferTv(GLenum buffer, GLint drawBuffer,
+                     const webgl::TypedQuad& data) const {
+    GetWebGL2Context()->ClearBufferTv(buffer, drawBuffer, data);
+  }
+
+  void ClearBufferfi(GLenum buffer, GLint drawBuffer, GLfloat depth,
+                     GLint stencil) const {
+    GetWebGL2Context()->ClearBufferfi(buffer, drawBuffer, depth, stencil);
+  }
+
+  // ------------------------------ Readback -------------------------------
+  void ReadPixelsPbo(const webgl::ReadPixelsDesc& desc,
+                     const uint64_t offset) const {
+    mContext->ReadPixelsPbo(desc, offset);
+  }
+
+  webgl::ReadPixelsResult ReadPixelsInto(const webgl::ReadPixelsDesc& desc,
+                                         const Range<uint8_t>& dest) const {
+    return mContext->ReadPixelsInto(desc, dest);
+  }
+
+  // ----------------------------- Sampler -----------------------------------
+
+  void BindSampler(GLuint unit, ObjectId id) const {
+    GetWebGL2Context()->BindSampler(unit, AutoResolve(id));
+  }
+
+  void SamplerParameteri(ObjectId id, GLenum pname, GLint param) const {
+    const auto obj = ById<WebGLSampler>(id);
+    if (!obj) return;
+    GetWebGL2Context()->SamplerParameteri(*obj, pname, param);
+  }
+
+  void SamplerParameterf(ObjectId id, GLenum pname, GLfloat param) const {
+    const auto obj = ById<WebGLSampler>(id);
+    if (!obj) return;
+    GetWebGL2Context()->SamplerParameterf(*obj, pname, param);
+  }
+
+  Maybe<double> GetSamplerParameter(ObjectId id, GLenum pname) const {
+    const auto obj = ById<WebGLSampler>(id);
+    if (!obj) return {};
+    return GetWebGL2Context()->GetSamplerParameter(*obj, pname);
+  }
+
+  // ------------------------------- GL Sync ---------------------------------
+
+  GLenum ClientWaitSync(ObjectId id, GLbitfield flags, GLuint64 timeout) const {
+    const auto obj = ById<WebGLSync>(id);
+    if (!obj) return LOCAL_GL_WAIT_FAILED;
+    return GetWebGL2Context()->ClientWaitSync(*obj, flags, timeout);
+  }
+
+  // -------------------------- Transform Feedback ---------------------------
+  void BindTransformFeedback(ObjectId id) const {
+    GetWebGL2Context()->BindTransformFeedback(AutoResolve(id));
+  }
+
+  void BeginTransformFeedback(GLenum primitiveMode) const {
+    GetWebGL2Context()->BeginTransformFeedback(primitiveMode);
+  }
+
+  void EndTransformFeedback() const {
+    GetWebGL2Context()->EndTransformFeedback();
+  }
+
+  void PauseTransformFeedback() const {
+    GetWebGL2Context()->PauseTransformFeedback();
+  }
+
+  void ResumeTransformFeedback() const {
+    GetWebGL2Context()->ResumeTransformFeedback();
+  }
+
+  void TransformFeedbackVaryings(ObjectId id,
+                                 const std::vector<std::string>& varyings,
+                                 GLenum bufferMode) const {
+    const auto obj = ById<WebGLProgram>(id);
+    if (!obj) return;
+    GetWebGL2Context()->TransformFeedbackVaryings(*obj, varyings, bufferMode);
+  }
+
+  // -------------------------- Opaque Framebuffers ---------------------------
+  void SetFramebufferIsInOpaqueRAF(ObjectId id, bool value) {
+    WebGLFramebuffer* fb = AutoResolve(id);
+    if (fb) {
+      fb->mInOpaqueRAF = value;
+    }
+  }
+
+  // -------------------------------------------------------------------------
+  // Host-side extension methods.  Calls in the client are forwarded to the
+  // host. Some extension methods are also available in WebGL2 Contexts.  For
+  // them, the final parameter is a boolean indicating if the call originated
+  // from an extension.
+  // -------------------------------------------------------------------------
+
+  // Misc. Extensions
+  void DrawBuffers(const std::vector<GLenum>& buffers) const {
+    mContext->DrawBuffers(buffers);
+  }
+
+  // VertexArrayObjectEXT
+  void BindVertexArray(ObjectId id) const {
+    mContext->BindVertexArray(AutoResolve(id));
+  }
+
+  // InstancedElementsEXT
+  void DrawArraysInstanced(GLenum mode, GLint first, GLsizei vertCount,
+                           GLsizei primCount) const {
+    mContext->DrawArraysInstanced(mode, first, vertCount, primCount);
+  }
+
+  void DrawElementsInstanced(GLenum mode, GLsizei vertCount, GLenum type,
+                             WebGLintptr offset, GLsizei primCount) const {
+    mContext->DrawElementsInstanced(mode, vertCount, type, offset, primCount);
+  }
+
+  // GLQueryEXT
+  void BeginQuery(GLenum target, ObjectId id) const {
+    const auto obj = ById<WebGLQuery>(id);
+    if (!obj) return;
+    mContext->BeginQuery(target, *obj);
+  }
+
+  void EndQuery(GLenum target) const { mContext->EndQuery(target); }
+
+  void QueryCounter(ObjectId id) const {
+    const auto obj = ById<WebGLQuery>(id);
+    if (!obj) return;
+    mContext->QueryCounter(*obj);
+  }
+
+  Maybe<double> GetQueryParameter(ObjectId id, GLenum pname) const {
+    const auto obj = ById<WebGLQuery>(id);
+    if (!obj) return {};
+    return mContext->GetQueryParameter(*obj, pname);
+  }
+
+  // WEBGL_provoking_vertex
+  void ProvokingVertex(const webgl::ProvokingVertex mode) const {
+    mContext->ProvokingVertex(mode);
+  }
+
+  // -------------------------------------------------------------------------
+  // Client-side methods.  Calls in the Host are forwarded to the client.
+  // -------------------------------------------------------------------------
+ public:
+  void OnLostContext();
+  void OnRestoredContext();
+
+ protected:
+  WebGL2Context* GetWebGL2Context() const {
+    MOZ_RELEASE_ASSERT(mContext->IsWebGL2(), "Requires WebGL2 context");
+    return static_cast<WebGL2Context*>(mContext.get());
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // HOSTWEBGLCONTEXT_H_