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ClientWebGLContext.cpp
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/* -*- Mode: C++; tab-width: 20; 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/. */
#include "ClientWebGLContext.h"
#include <bitset>
#include "ClientWebGLExtensions.h"
#include "Layers.h"
#include "gfxCrashReporterUtils.h"
#include "HostWebGLContext.h"
#include "js/PropertyAndElement.h" // JS_DefineElement
#include "js/ScalarType.h" // js::Scalar::Type
#include "mozilla/dom/Document.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/WebGLContextEvent.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/EnumeratedRange.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/CanvasManagerChild.h"
#include "mozilla/ipc/Shmem.h"
#include "mozilla/gfx/Swizzle.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/ImageBridgeChild.h"
#include "mozilla/layers/OOPCanvasRenderer.h"
#include "mozilla/layers/TextureClientSharedSurface.h"
#include "mozilla/layers/WebRenderUserData.h"
#include "mozilla/layers/WebRenderCanvasRenderer.h"
#include "mozilla/Preferences.h"
#include "mozilla/ResultVariant.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_webgl.h"
#include "nsContentUtils.h"
#include "nsDisplayList.h"
#include "TexUnpackBlob.h"
#include "WebGLMethodDispatcher.h"
#include "WebGLChild.h"
#include "WebGLValidateStrings.h"
namespace mozilla {
namespace webgl {
std::string SanitizeRenderer(const std::string&);
} // namespace webgl
// -
webgl::NotLostData::NotLostData(ClientWebGLContext& _context)
: context(_context) {}
webgl::NotLostData::~NotLostData() {
if (outOfProcess) {
Unused << dom::WebGLChild::Send__delete__(outOfProcess.get());
}
}
// -
bool webgl::ObjectJS::ValidateForContext(
const ClientWebGLContext& targetContext, const char* const argName) const {
if (!IsForContext(targetContext)) {
targetContext.EnqueueError(
LOCAL_GL_INVALID_OPERATION,
"`%s` is from a different (or lost) WebGL context.", argName);
return false;
}
return true;
}
void webgl::ObjectJS::WarnInvalidUse(const ClientWebGLContext& targetContext,
const char* const argName) const {
if (!ValidateForContext(targetContext, argName)) return;
const auto errEnum = ErrorOnDeleted();
targetContext.EnqueueError(errEnum, "Object `%s` is already deleted.",
argName);
}
static bool GetJSScalarFromGLType(GLenum type,
js::Scalar::Type* const out_scalarType) {
switch (type) {
case LOCAL_GL_BYTE:
*out_scalarType = js::Scalar::Int8;
return true;
case LOCAL_GL_UNSIGNED_BYTE:
*out_scalarType = js::Scalar::Uint8;
return true;
case LOCAL_GL_SHORT:
*out_scalarType = js::Scalar::Int16;
return true;
case LOCAL_GL_HALF_FLOAT:
case LOCAL_GL_HALF_FLOAT_OES:
case LOCAL_GL_UNSIGNED_SHORT:
case LOCAL_GL_UNSIGNED_SHORT_4_4_4_4:
case LOCAL_GL_UNSIGNED_SHORT_5_5_5_1:
case LOCAL_GL_UNSIGNED_SHORT_5_6_5:
*out_scalarType = js::Scalar::Uint16;
return true;
case LOCAL_GL_UNSIGNED_INT:
case LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV:
case LOCAL_GL_UNSIGNED_INT_5_9_9_9_REV:
case LOCAL_GL_UNSIGNED_INT_10F_11F_11F_REV:
case LOCAL_GL_UNSIGNED_INT_24_8:
*out_scalarType = js::Scalar::Uint32;
return true;
case LOCAL_GL_INT:
*out_scalarType = js::Scalar::Int32;
return true;
case LOCAL_GL_FLOAT:
*out_scalarType = js::Scalar::Float32;
return true;
default:
return false;
}
}
ClientWebGLContext::ClientWebGLContext(const bool webgl2)
: mIsWebGL2(webgl2),
mExtLoseContext(new ClientWebGLExtensionLoseContext(*this)) {}
ClientWebGLContext::~ClientWebGLContext() { RemovePostRefreshObserver(); }
void ClientWebGLContext::JsWarning(const std::string& utf8) const {
nsIGlobalObject* global = nullptr;
if (mCanvasElement) {
mozilla::dom::Document* doc = mCanvasElement->OwnerDoc();
if (doc) {
global = doc->GetScopeObject();
}
} else if (mOffscreenCanvas) {
global = mOffscreenCanvas->GetOwnerGlobal();
}
dom::AutoJSAPI api;
if (!api.Init(global)) {
return;
}
const auto& cx = api.cx();
JS::WarnUTF8(cx, "%s", utf8.c_str());
}
void AutoJsWarning(const std::string& utf8) {
if (NS_IsMainThread()) {
const AutoJSContext cx;
JS::WarnUTF8(cx, "%s", utf8.c_str());
return;
}
JSContext* cx = dom::GetCurrentWorkerThreadJSContext();
if (NS_WARN_IF(!cx)) {
return;
}
JS::WarnUTF8(cx, "%s", utf8.c_str());
}
// ---------
bool ClientWebGLContext::DispatchEvent(const nsAString& eventName) const {
const auto kCanBubble = CanBubble::eYes;
const auto kIsCancelable = Cancelable::eYes;
bool useDefaultHandler = true;
if (mCanvasElement) {
nsContentUtils::DispatchTrustedEvent(
mCanvasElement->OwnerDoc(), static_cast<nsIContent*>(mCanvasElement),
eventName, kCanBubble, kIsCancelable, &useDefaultHandler);
} else if (mOffscreenCanvas) {
// OffscreenCanvas case
RefPtr<dom::Event> event =
new dom::Event(mOffscreenCanvas, nullptr, nullptr);
event->InitEvent(eventName, kCanBubble, kIsCancelable);
event->SetTrusted(true);
useDefaultHandler = mOffscreenCanvas->DispatchEvent(
*event, dom::CallerType::System, IgnoreErrors());
}
return useDefaultHandler;
}
// -
void ClientWebGLContext::EmulateLoseContext() const {
const FuncScope funcScope(*this, "loseContext");
if (mLossStatus != webgl::LossStatus::Ready) {
JsWarning("loseContext: Already lost.");
if (!mNextError) {
mNextError = LOCAL_GL_INVALID_OPERATION;
}
return;
}
OnContextLoss(webgl::ContextLossReason::Manual);
}
void ClientWebGLContext::OnContextLoss(
const webgl::ContextLossReason reason) const {
JsWarning("WebGL context was lost.");
if (mNotLost) {
for (const auto& ext : mNotLost->extensions) {
if (!ext) continue;
ext->mContext = nullptr; // Detach.
}
mNotLost = {}; // Lost now!
mNextError = LOCAL_GL_CONTEXT_LOST_WEBGL;
}
switch (reason) {
case webgl::ContextLossReason::Guilty:
mLossStatus = webgl::LossStatus::LostForever;
break;
case webgl::ContextLossReason::None:
mLossStatus = webgl::LossStatus::Lost;
break;
case webgl::ContextLossReason::Manual:
mLossStatus = webgl::LossStatus::LostManually;
break;
}
const auto weak = WeakPtr<const ClientWebGLContext>(this);
const auto fnRun = [weak]() {
const auto strong = RefPtr<const ClientWebGLContext>(weak);
if (!strong) return;
strong->Event_webglcontextlost();
};
already_AddRefed<mozilla::CancelableRunnable> runnable =
NS_NewCancelableRunnableFunction("enqueue Event_webglcontextlost", fnRun);
NS_DispatchToCurrentThread(std::move(runnable));
}
void ClientWebGLContext::Event_webglcontextlost() const {
const bool useDefaultHandler = DispatchEvent(u"webglcontextlost"_ns);
if (useDefaultHandler) {
mLossStatus = webgl::LossStatus::LostForever;
}
if (mLossStatus == webgl::LossStatus::Lost) {
RestoreContext(webgl::LossStatus::Lost);
}
}
void ClientWebGLContext::RestoreContext(
const webgl::LossStatus requiredStatus) const {
if (requiredStatus != mLossStatus) {
JsWarning(
"restoreContext: Only valid iff context lost with loseContext().");
if (!mNextError) {
mNextError = LOCAL_GL_INVALID_OPERATION;
}
return;
}
MOZ_RELEASE_ASSERT(mLossStatus == webgl::LossStatus::Lost ||
mLossStatus == webgl::LossStatus::LostManually);
if (mAwaitingRestore) return;
mAwaitingRestore = true;
const auto weak = WeakPtr<const ClientWebGLContext>(this);
const auto fnRun = [weak]() {
const auto strong = RefPtr<const ClientWebGLContext>(weak);
if (!strong) return;
strong->Event_webglcontextrestored();
};
already_AddRefed<mozilla::CancelableRunnable> runnable =
NS_NewCancelableRunnableFunction("enqueue Event_webglcontextrestored",
fnRun);
NS_DispatchToCurrentThread(std::move(runnable));
}
void ClientWebGLContext::Event_webglcontextrestored() const {
mAwaitingRestore = false;
mLossStatus = webgl::LossStatus::Ready;
mNextError = 0;
uvec2 requestSize;
if (mCanvasElement) {
requestSize = {mCanvasElement->Width(), mCanvasElement->Height()};
} else if (mOffscreenCanvas) {
requestSize = {mOffscreenCanvas->Width(), mOffscreenCanvas->Height()};
} else {
MOZ_ASSERT_UNREACHABLE("no HTMLCanvasElement or OffscreenCanvas!");
return;
}
const auto mutThis = const_cast<ClientWebGLContext*>(
this); // TODO: Make context loss non-mutable.
if (!mutThis->CreateHostContext(requestSize)) {
mLossStatus = webgl::LossStatus::LostForever;
return;
}
(void)DispatchEvent(u"webglcontextrestored"_ns);
}
// ---------
void ClientWebGLContext::ThrowEvent_WebGLContextCreationError(
const std::string& text) const {
nsCString msg;
msg.AppendPrintf("Failed to create WebGL context: %s", text.c_str());
JsWarning(msg.BeginReading());
RefPtr<dom::EventTarget> target = mCanvasElement;
if (!target && mOffscreenCanvas) {
target = mOffscreenCanvas;
} else if (!target) {
return;
}
const auto kEventName = u"webglcontextcreationerror"_ns;
dom::WebGLContextEventInit eventInit;
// eventInit.mCancelable = true; // The spec says this, but it's silly.
eventInit.mStatusMessage = NS_ConvertASCIItoUTF16(text.c_str());
const RefPtr<dom::WebGLContextEvent> event =
dom::WebGLContextEvent::Constructor(target, kEventName, eventInit);
event->SetTrusted(true);
target->DispatchEvent(*event);
}
// -
// If we are running WebGL in this process then call the HostWebGLContext
// method directly. Otherwise, dispatch over IPC.
template <typename MethodType, MethodType method, typename... Args>
void ClientWebGLContext::Run(Args&&... args) const {
const auto notLost =
mNotLost; // Hold a strong-ref to prevent LoseContext=>UAF.
if (IsContextLost()) return;
const auto& inProcess = notLost->inProcess;
if (inProcess) {
return (inProcess.get()->*method)(std::forward<Args>(args)...);
}
const auto& child = notLost->outOfProcess;
const auto id = IdByMethod<MethodType, method>();
const auto size = webgl::SerializedSize(id, args...);
const auto maybeDest = child->AllocPendingCmdBytes(size);
if (!maybeDest) {
JsWarning("Failed to allocate internal command buffer.");
OnContextLoss(webgl::ContextLossReason::None);
return;
}
const auto& destBytes = *maybeDest;
webgl::Serialize(destBytes, id, args...);
}
// -------------------------------------------------------------------------
// Client-side helper methods. Dispatch to a Host method.
// -------------------------------------------------------------------------
#define RPROC(_METHOD) \
decltype(&HostWebGLContext::_METHOD), &HostWebGLContext::_METHOD
// ------------------------- Composition, etc -------------------------
void ClientWebGLContext::OnBeforePaintTransaction() { Present(nullptr); }
void ClientWebGLContext::EndComposition() {
// Mark ourselves as no longer invalidated.
MarkContextClean();
}
// -
layers::TextureType ClientWebGLContext::GetTexTypeForSwapChain() const {
const RefPtr<layers::ImageBridgeChild> imageBridge =
layers::ImageBridgeChild::GetSingleton();
return layers::TexTypeForWebgl(imageBridge);
}
void ClientWebGLContext::Present(WebGLFramebufferJS* const xrFb,
const bool webvr) {
const auto texType = GetTexTypeForSwapChain();
Present(xrFb, texType, webvr);
}
void ClientWebGLContext::Present(WebGLFramebufferJS* const xrFb,
const layers::TextureType type,
const bool webvr) {
if (!mIsCanvasDirty && !xrFb) return;
if (!xrFb) {
mIsCanvasDirty = false;
}
CancelAutoFlush();
Run<RPROC(Present)>(xrFb ? xrFb->mId : 0, type, webvr);
}
void ClientWebGLContext::CopyToSwapChain(
WebGLFramebufferJS* const fb, const webgl::SwapChainOptions& options) {
CancelAutoFlush();
const auto texType = GetTexTypeForSwapChain();
Run<RPROC(CopyToSwapChain)>(fb ? fb->mId : 0, texType, options);
}
void ClientWebGLContext::EndOfFrame() {
CancelAutoFlush();
Run<RPROC(EndOfFrame)>();
}
Maybe<layers::SurfaceDescriptor> ClientWebGLContext::GetFrontBuffer(
WebGLFramebufferJS* const fb, bool vr) {
const auto notLost = mNotLost;
if (IsContextLost()) return {};
const auto& inProcess = mNotLost->inProcess;
if (inProcess) {
return inProcess->GetFrontBuffer(fb ? fb->mId : 0, vr);
}
const auto& child = mNotLost->outOfProcess;
child->FlushPendingCmds();
Maybe<layers::SurfaceDescriptor> ret;
if (!child->SendGetFrontBuffer(fb ? fb->mId : 0, vr, &ret)) return {};
return ret;
}
Maybe<layers::SurfaceDescriptor> ClientWebGLContext::PresentFrontBuffer(
WebGLFramebufferJS* const fb, const layers::TextureType type, bool webvr) {
Present(fb, type, webvr);
return GetFrontBuffer(fb, webvr);
}
void ClientWebGLContext::ClearVRSwapChain() { Run<RPROC(ClearVRSwapChain)>(); }
// -
bool ClientWebGLContext::UpdateWebRenderCanvasData(
nsDisplayListBuilder* aBuilder, WebRenderCanvasData* aCanvasData) {
CanvasRenderer* renderer = aCanvasData->GetCanvasRenderer();
if (!mResetLayer && renderer) {
return true;
}
renderer = aCanvasData->CreateCanvasRenderer();
if (!InitializeCanvasRenderer(aBuilder, renderer)) {
// Clear CanvasRenderer of WebRenderCanvasData
aCanvasData->ClearCanvasRenderer();
return false;
}
MOZ_ASSERT(renderer);
mResetLayer = false;
return true;
}
bool ClientWebGLContext::InitializeCanvasRenderer(
nsDisplayListBuilder* aBuilder, CanvasRenderer* aRenderer) {
const FuncScope funcScope(*this, "<InitializeCanvasRenderer>");
if (IsContextLost()) return false;
layers::CanvasRendererData data;
data.mContext = this;
data.mOriginPos = gl::OriginPos::BottomLeft;
const auto& options = *mInitialOptions;
const auto& size = DrawingBufferSize();
data.mIsOpaque = !options.alpha;
data.mIsAlphaPremult = !options.alpha || options.premultipliedAlpha;
data.mSize = {size.x, size.y};
if (aBuilder->IsPaintingToWindow() && mCanvasElement) {
data.mDoPaintCallbacks = true;
}
aRenderer->Initialize(data);
aRenderer->SetDirty();
return true;
}
void ClientWebGLContext::UpdateCanvasParameters() {
if (!mOffscreenCanvas) {
return;
}
const auto& options = *mInitialOptions;
const auto& size = DrawingBufferSize();
mozilla::dom::OffscreenCanvasDisplayData data;
data.mOriginPos = gl::OriginPos::BottomLeft;
data.mIsOpaque = !options.alpha;
data.mIsAlphaPremult = !options.alpha || options.premultipliedAlpha;
data.mSize = {size.x, size.y};
data.mDoPaintCallbacks = false;
mOffscreenCanvas->UpdateDisplayData(data);
}
layers::LayersBackend ClientWebGLContext::GetCompositorBackendType() const {
if (mCanvasElement) {
return mCanvasElement->GetCompositorBackendType();
} else if (mOffscreenCanvas) {
return mOffscreenCanvas->GetCompositorBackendType();
}
return layers::LayersBackend::LAYERS_NONE;
}
mozilla::dom::Document* ClientWebGLContext::GetOwnerDoc() const {
MOZ_ASSERT(mCanvasElement);
if (!mCanvasElement) {
return nullptr;
}
return mCanvasElement->OwnerDoc();
}
void ClientWebGLContext::Commit() {
if (mOffscreenCanvas) {
mOffscreenCanvas->CommitFrameToCompositor();
}
}
void ClientWebGLContext::GetCanvas(
dom::Nullable<dom::OwningHTMLCanvasElementOrOffscreenCanvas>& retval) {
if (mCanvasElement) {
MOZ_RELEASE_ASSERT(!mOffscreenCanvas, "GFX: Canvas is offscreen.");
if (mCanvasElement->IsInNativeAnonymousSubtree()) {
retval.SetNull();
} else {
retval.SetValue().SetAsHTMLCanvasElement() = mCanvasElement;
}
} else if (mOffscreenCanvas) {
retval.SetValue().SetAsOffscreenCanvas() = mOffscreenCanvas;
} else {
retval.SetNull();
}
}
void ClientWebGLContext::GetContextAttributes(
dom::Nullable<dom::WebGLContextAttributes>& retval) {
retval.SetNull();
const FuncScope funcScope(*this, "getContextAttributes");
if (IsContextLost()) return;
dom::WebGLContextAttributes& result = retval.SetValue();
const auto& options = mNotLost->info.options;
result.mAlpha.Construct(options.alpha);
result.mDepth = options.depth;
result.mStencil = options.stencil;
result.mAntialias.Construct(options.antialias);
result.mPremultipliedAlpha = options.premultipliedAlpha;
result.mPreserveDrawingBuffer = options.preserveDrawingBuffer;
result.mFailIfMajorPerformanceCaveat = options.failIfMajorPerformanceCaveat;
result.mPowerPreference = options.powerPreference;
}
// -----------------------
NS_IMETHODIMP
ClientWebGLContext::SetDimensions(const int32_t signedWidth,
const int32_t signedHeight) {
const FuncScope funcScope(*this, "<SetDimensions>");
MOZ_ASSERT(mInitialOptions);
if (mLossStatus != webgl::LossStatus::Ready) {
// Attempted resize of a lost context.
return NS_OK;
}
uvec2 size = {static_cast<uint32_t>(signedWidth),
static_cast<uint32_t>(signedHeight)};
if (!size.x) {
size.x = 1;
}
if (!size.y) {
size.y = 1;
}
const auto prevRequestedSize = mRequestedSize;
mRequestedSize = size;
mResetLayer = true; // Always treat this as resize.
if (mNotLost) {
auto& state = State();
auto curSize = prevRequestedSize;
if (state.mDrawingBufferSize) {
curSize = *state.mDrawingBufferSize;
}
if (size == curSize) return NS_OK; // MUST skip no-op resize
state.mDrawingBufferSize = Nothing();
Run<RPROC(Resize)>(size);
UpdateCanvasParameters();
MarkCanvasDirty();
return NS_OK;
}
// -
// Context (re-)creation
if (!CreateHostContext(size)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
static bool IsWebglOutOfProcessEnabled() {
if (StaticPrefs::webgl_out_of_process_force()) {
return true;
}
if (!gfx::gfxVars::AllowWebglOop()) {
return false;
}
if (!NS_IsMainThread()) {
return StaticPrefs::webgl_out_of_process_worker();
}
return StaticPrefs::webgl_out_of_process();
}
static inline bool StartsWith(const std::string& haystack,
const std::string& needle) {
return haystack.find(needle) == 0;
}
bool ClientWebGLContext::CreateHostContext(const uvec2& requestedSize) {
const auto pNotLost = std::make_shared<webgl::NotLostData>(*this);
auto& notLost = *pNotLost;
auto res = [&]() -> Result<Ok, std::string> {
auto options = *mInitialOptions;
if (StaticPrefs::webgl_disable_fail_if_major_performance_caveat()) {
options.failIfMajorPerformanceCaveat = false;
}
if (options.failIfMajorPerformanceCaveat) {
const auto backend = GetCompositorBackendType();
bool isCompositorSlow = false;
isCompositorSlow |= (backend == layers::LayersBackend::LAYERS_WR &&
gfx::gfxVars::UseSoftwareWebRender());
if (isCompositorSlow) {
return Err(
"failIfMajorPerformanceCaveat: Compositor is not"
" hardware-accelerated.");
}
}
const bool resistFingerprinting = ShouldResistFingerprinting();
const auto principalKey = GetPrincipalHashValue();
const auto initDesc = webgl::InitContextDesc{
mIsWebGL2, resistFingerprinting, requestedSize, options, principalKey};
// -
auto useOop = IsWebglOutOfProcessEnabled();
if (XRE_IsParentProcess()) {
useOop = false;
}
if (!useOop) {
notLost.inProcess =
HostWebGLContext::Create({this, nullptr}, initDesc, ¬Lost.info);
return Ok();
}
// -
ScopedGfxFeatureReporter reporter("IpcWebGL");
auto* const cm = gfx::CanvasManagerChild::Get();
MOZ_ASSERT(cm);
if (!cm) {
return Err("!CanvasManagerChild::Get()");
}
RefPtr<dom::WebGLChild> outOfProcess = new dom::WebGLChild(*this);
outOfProcess =
static_cast<dom::WebGLChild*>(cm->SendPWebGLConstructor(outOfProcess));
if (!outOfProcess) {
return Err("SendPWebGLConstructor failed");
}
if (!outOfProcess->SendInitialize(initDesc, ¬Lost.info)) {
return Err("WebGL actor Initialize failed");
}
notLost.outOfProcess = outOfProcess;
reporter.SetSuccessful();
return Ok();
}();
if (!res.isOk()) {
auto str = res.unwrapErr();
if (StartsWith(str, "failIfMajorPerformanceCaveat")) {
str +=
" (about:config override available:"
" webgl.disable-fail-if-major-performance-caveat)";
}
notLost.info.error = str;
}
if (!notLost.info.error.empty()) {
ThrowEvent_WebGLContextCreationError(notLost.info.error);
return false;
}
mNotLost = pNotLost;
UpdateCanvasParameters();
MarkCanvasDirty();
// Init state
const auto& limits = Limits();
auto& state = State();
state.mDefaultTfo = new WebGLTransformFeedbackJS(*this);
state.mDefaultVao = new WebGLVertexArrayJS(*this);
state.mBoundTfo = state.mDefaultTfo;
state.mBoundVao = state.mDefaultVao;
(void)state.mBoundBufferByTarget[LOCAL_GL_ARRAY_BUFFER];
state.mTexUnits.resize(limits.maxTexUnits);
state.mBoundUbos.resize(limits.maxUniformBufferBindings);
{
webgl::TypedQuad initVal;
const float fData[4] = {0, 0, 0, 1};
memcpy(initVal.data, fData, sizeof(initVal.data));
state.mGenericVertexAttribs.resize(limits.maxVertexAttribs, initVal);
}
const auto& size = DrawingBufferSize();
state.mViewport = {0, 0, static_cast<int32_t>(size.x),
static_cast<int32_t>(size.y)};
state.mScissor = state.mViewport;
if (mIsWebGL2) {
// Insert keys to enable slots:
(void)state.mBoundBufferByTarget[LOCAL_GL_COPY_READ_BUFFER];
(void)state.mBoundBufferByTarget[LOCAL_GL_COPY_WRITE_BUFFER];
(void)state.mBoundBufferByTarget[LOCAL_GL_PIXEL_PACK_BUFFER];
(void)state.mBoundBufferByTarget[LOCAL_GL_PIXEL_UNPACK_BUFFER];
(void)state.mBoundBufferByTarget[LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER];
(void)state.mBoundBufferByTarget[LOCAL_GL_UNIFORM_BUFFER];
(void)state.mCurrentQueryByTarget[LOCAL_GL_ANY_SAMPLES_PASSED];
//(void)state.mCurrentQueryByTarget[LOCAL_GL_ANY_SAMPLES_PASSED_CONSERVATIVE];
//// Same slot as ANY_SAMPLES_PASSED.
(void)state
.mCurrentQueryByTarget[LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN];
}
return true;
}
// -------
uvec2 ClientWebGLContext::DrawingBufferSize() {
if (IsContextLost()) return {};
const auto notLost =
mNotLost; // Hold a strong-ref to prevent LoseContext=>UAF.
auto& state = State();
auto& size = state.mDrawingBufferSize;
if (!size) {
const auto& inProcess = mNotLost->inProcess;
if (inProcess) {
size = Some(inProcess->DrawingBufferSize());
} else {
const auto& child = mNotLost->outOfProcess;
child->FlushPendingCmds();
uvec2 actual = {};
if (!child->SendDrawingBufferSize(&actual)) return {};
size = Some(actual);
}
}
return *size;
}
void ClientWebGLContext::OnMemoryPressure() {
if (IsContextLost()) return;
const auto& inProcess = mNotLost->inProcess;
if (inProcess) {
return inProcess->OnMemoryPressure();
}
const auto& child = mNotLost->outOfProcess;
(void)child->SendOnMemoryPressure();
}
NS_IMETHODIMP
ClientWebGLContext::SetContextOptions(JSContext* cx,
JS::Handle<JS::Value> options,
ErrorResult& aRvForDictionaryInit) {
if (mInitialOptions && options.isNullOrUndefined()) return NS_OK;
dom::WebGLContextAttributes attributes;
if (!attributes.Init(cx, options)) {
aRvForDictionaryInit.Throw(NS_ERROR_UNEXPECTED);
return NS_ERROR_UNEXPECTED;
}
WebGLContextOptions newOpts;
newOpts.stencil = attributes.mStencil;
newOpts.depth = attributes.mDepth;
newOpts.premultipliedAlpha = attributes.mPremultipliedAlpha;
newOpts.preserveDrawingBuffer = attributes.mPreserveDrawingBuffer;
newOpts.failIfMajorPerformanceCaveat =
attributes.mFailIfMajorPerformanceCaveat;
newOpts.xrCompatible = attributes.mXrCompatible;
newOpts.powerPreference = attributes.mPowerPreference;
newOpts.enableDebugRendererInfo =
StaticPrefs::webgl_enable_debug_renderer_info();
MOZ_ASSERT(mCanvasElement || mOffscreenCanvas);
newOpts.shouldResistFingerprinting = ShouldResistFingerprinting();
if (attributes.mAlpha.WasPassed()) {
newOpts.alpha = attributes.mAlpha.Value();
}
if (attributes.mAntialias.WasPassed()) {
newOpts.antialias = attributes.mAntialias.Value();
}
// Don't do antialiasing if we've disabled MSAA.
if (!StaticPrefs::webgl_msaa_samples()) {
newOpts.antialias = false;
}
if (mInitialOptions && *mInitialOptions != newOpts) {
// Err if the options asked for aren't the same as what they were
// originally.
return NS_ERROR_FAILURE;
}
mXRCompatible = attributes.mXrCompatible;
mInitialOptions.emplace(newOpts);
return NS_OK;
}
void ClientWebGLContext::DidRefresh() { Run<RPROC(DidRefresh)>(); }
already_AddRefed<gfx::SourceSurface> ClientWebGLContext::GetSurfaceSnapshot(
gfxAlphaType* const out_alphaType) {
const FuncScope funcScope(*this, "<GetSurfaceSnapshot>");
if (IsContextLost()) return nullptr;
const auto notLost =
mNotLost; // Hold a strong-ref to prevent LoseContext=>UAF.
auto ret = BackBufferSnapshot();
if (!ret) return nullptr;
// -
const auto& options = mNotLost->info.options;
auto srcAlphaType = gfxAlphaType::Opaque;
if (options.alpha) {
if (options.premultipliedAlpha) {
srcAlphaType = gfxAlphaType::Premult;
} else {
srcAlphaType = gfxAlphaType::NonPremult;
}
}
if (out_alphaType) {
*out_alphaType = srcAlphaType;
} else {
// Expects Opaque or Premult
if (srcAlphaType == gfxAlphaType::NonPremult) {
const gfx::DataSourceSurface::ScopedMap map(
ret, gfx::DataSourceSurface::READ_WRITE);
MOZ_RELEASE_ASSERT(map.IsMapped(), "Failed to map snapshot surface!");
const auto& size = ret->GetSize();
const auto format = ret->GetFormat();
bool rv =
gfx::PremultiplyData(map.GetData(), map.GetStride(), format,
map.GetData(), map.GetStride(), format, size);
MOZ_RELEASE_ASSERT(rv, "PremultiplyData failed!");
}
}
return ret.forget();
}
RefPtr<gfx::SourceSurface> ClientWebGLContext::GetFrontBufferSnapshot(
const bool requireAlphaPremult) {
const FuncScope funcScope(*this, "<GetSurfaceSnapshot>");
if (IsContextLost()) return nullptr;
const auto notLost =
mNotLost; // Hold a strong-ref to prevent LoseContext=>UAF.
const auto& options = mNotLost->info.options;
const auto surfFormat = options.alpha ? gfx::SurfaceFormat::B8G8R8A8
: gfx::SurfaceFormat::B8G8R8X8;
const auto fnNewSurf = [&](const uvec2 size) {
const auto stride = size.x * 4;
return RefPtr<gfx::DataSourceSurface>(
gfx::Factory::CreateDataSourceSurfaceWithStride({size.x, size.y},
surfFormat, stride,
/*zero=*/true));
};
const auto& inProcess = mNotLost->inProcess;
if (inProcess) {
const auto maybeSize = inProcess->FrontBufferSnapshotInto({});
if (!maybeSize) return nullptr;
const auto& surfSize = *maybeSize;
const auto stride = surfSize.x * 4;
const auto byteSize = stride * surfSize.y;
const auto surf = fnNewSurf(surfSize);
if (!surf) return nullptr;
{
const gfx::DataSourceSurface::ScopedMap map(
surf, gfx::DataSourceSurface::READ_WRITE);
if (!map.IsMapped()) {
MOZ_ASSERT(false);
return nullptr;
}
MOZ_RELEASE_ASSERT(map.GetStride() == static_cast<int64_t>(stride));
auto range = Range<uint8_t>{map.GetData(), byteSize};
if (!inProcess->FrontBufferSnapshotInto(Some(range))) {
gfxCriticalNote << "ClientWebGLContext::GetFrontBufferSnapshot: "
"FrontBufferSnapshotInto(some) failed after "
"FrontBufferSnapshotInto(none)";
return nullptr;
}
if (requireAlphaPremult && options.alpha && !options.premultipliedAlpha) {
bool rv = gfx::PremultiplyData(
map.GetData(), map.GetStride(), gfx::SurfaceFormat::R8G8B8A8,
map.GetData(), map.GetStride(), gfx::SurfaceFormat::B8G8R8A8,
surf->GetSize());
MOZ_RELEASE_ASSERT(rv, "PremultiplyData failed!");
} else {
bool rv = gfx::SwizzleData(
map.GetData(), map.GetStride(), gfx::SurfaceFormat::R8G8B8A8,
map.GetData(), map.GetStride(), gfx::SurfaceFormat::B8G8R8A8,
surf->GetSize());
MOZ_RELEASE_ASSERT(rv, "SwizzleData failed!");
}
}
return surf;
}
const auto& child = mNotLost->outOfProcess;
child->FlushPendingCmds();
webgl::FrontBufferSnapshotIpc res;
if (!child->SendGetFrontBufferSnapshot(&res)) {
res = {};
}
if (!res.shmem) return nullptr;
const auto& surfSize = res.surfSize;
const webgl::RaiiShmem shmem{child, res.shmem.ref()};
const auto& shmemBytes = shmem.ByteRange();
if (!surfSize.x) return nullptr; // Zero means failure.
const auto stride = surfSize.x * 4;
const auto byteSize = stride * surfSize.y;
const auto surf = fnNewSurf(surfSize);
if (!surf) return nullptr;
{
const gfx::DataSourceSurface::ScopedMap map(
surf, gfx::DataSourceSurface::READ_WRITE);
if (!map.IsMapped()) {
MOZ_ASSERT(false);
return nullptr;
}
MOZ_RELEASE_ASSERT(shmemBytes.length() == byteSize);
if (requireAlphaPremult && options.alpha && !options.premultipliedAlpha) {
bool rv = gfx::PremultiplyData(
shmemBytes.begin().get(), stride, gfx::SurfaceFormat::R8G8B8A8,
map.GetData(), map.GetStride(), gfx::SurfaceFormat::B8G8R8A8,
surf->GetSize());
MOZ_RELEASE_ASSERT(rv, "PremultiplyData failed!");
} else {
bool rv = gfx::SwizzleData(shmemBytes.begin().get(), stride,
gfx::SurfaceFormat::R8G8B8A8, map.GetData(),
map.GetStride(), gfx::SurfaceFormat::B8G8R8A8,
surf->GetSize());
MOZ_RELEASE_ASSERT(rv, "SwizzleData failed!");
}
}
return surf;
}
RefPtr<gfx::DataSourceSurface> ClientWebGLContext::BackBufferSnapshot() {