Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 1254 insertions, 0 deletions

diff --git a/gfx/gl/GLContextProviderEGL.cpp b/gfx/gl/GLContextProviderEGL.cpp
new file mode 100644
index 0000000000..a685d94eea
--- /dev/null
+++ b/gfx/gl/GLContextProviderEGL.cpp
@@ -0,0 +1,1254 @@
+/* -*- 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/. */
+
+#if defined(MOZ_WIDGET_GTK)
+#  define GET_NATIVE_WINDOW_FROM_REAL_WIDGET(aWidget) \
+    ((EGLNativeWindowType)aWidget->GetNativeData(NS_NATIVE_EGL_WINDOW))
+#  define GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aWidget) \
+    (aWidget->AsGTK()->GetEGLNativeWindow())
+#elif defined(MOZ_WIDGET_ANDROID)
+#  define GET_NATIVE_WINDOW_FROM_REAL_WIDGET(aWidget) \
+    ((EGLNativeWindowType)aWidget->GetNativeData(NS_JAVA_SURFACE))
+#  define GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aWidget) \
+    (aWidget->AsAndroid()->GetEGLNativeWindow())
+#elif defined(XP_WIN)
+#  define GET_NATIVE_WINDOW_FROM_REAL_WIDGET(aWidget) \
+    ((EGLNativeWindowType)aWidget->GetNativeData(NS_NATIVE_WINDOW))
+#  define GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aWidget) \
+    ((EGLNativeWindowType)aWidget->AsWindows()->GetHwnd())
+#else
+#  define GET_NATIVE_WINDOW_FROM_REAL_WIDGET(aWidget) \
+    ((EGLNativeWindowType)aWidget->GetNativeData(NS_NATIVE_WINDOW))
+#  define GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aWidget)     \
+    ((EGLNativeWindowType)aWidget->RealWidget()->GetNativeData( \
+        NS_NATIVE_WINDOW))
+#endif
+
+#if defined(XP_UNIX)
+#  ifdef MOZ_WIDGET_ANDROID
+#    include <android/native_window.h>
+#    include <android/native_window_jni.h>
+#    include "mozilla/widget/AndroidCompositorWidget.h"
+#  endif
+
+#  define GLES2_LIB "libGLESv2.so"
+#  define GLES2_LIB2 "libGLESv2.so.2"
+
+#elif defined(XP_WIN)
+#  include "mozilla/widget/WinCompositorWidget.h"
+#  include "nsIFile.h"
+
+#  define GLES2_LIB "libGLESv2.dll"
+
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN 1
+#  endif
+
+#  include <windows.h>
+#else
+#  error "Platform not recognized"
+#endif
+
+#include "gfxCrashReporterUtils.h"
+#include "gfxFailure.h"
+#include "gfxPlatform.h"
+#include "gfxUtils.h"
+#include "GLBlitHelper.h"
+#include "GLContextEGL.h"
+#include "GLContextProvider.h"
+#include "GLLibraryEGL.h"
+#include "GLLibraryLoader.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/gfx/BuildConstants.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/layers/CompositorOptions.h"
+#include "mozilla/widget/CompositorWidget.h"
+#include "nsDebug.h"
+#include "nsIWidget.h"
+#include "nsThreadUtils.h"
+#include "ScopedGLHelpers.h"
+
+#if defined(MOZ_WIDGET_GTK)
+#  include "mozilla/widget/GtkCompositorWidget.h"
+#  if defined(MOZ_WAYLAND)
+#    include <gdk/gdkwayland.h>
+#    include <wayland-egl.h>
+#    include "mozilla/WidgetUtilsGtk.h"
+#    include "mozilla/widget/nsWaylandDisplay.h"
+#  endif
+#endif
+
+struct wl_egl_window;
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace gl {
+
+using namespace mozilla::widget;
+
+#if defined(MOZ_WAYLAND)
+class SavedGLSurface {
+ public:
+  SavedGLSurface(struct wl_surface* aWaylandSurface,
+                 struct wl_egl_window* aEGLWindow);
+  ~SavedGLSurface();
+
+ private:
+  struct wl_surface* mWaylandSurface = nullptr;
+  struct wl_egl_window* mEGLWindow = nullptr;
+};
+
+static nsTHashMap<nsPtrHashKey<void>, SavedGLSurface*> sSavedGLSurfaces;
+
+void DeleteSavedGLSurface(EGLSurface surface) {
+  auto entry = sSavedGLSurfaces.Lookup(surface);
+  if (entry) {
+    delete entry.Data();
+    entry.Remove();
+  }
+}
+#endif
+
+static bool CreateConfigScreen(EglDisplay&, EGLConfig* const aConfig,
+                               const bool aEnableDepthBuffer,
+                               const bool aUseGles);
+
+// append three zeros at the end of attribs list to work around
+// EGL implementation bugs that iterate until they find 0, instead of
+// EGL_NONE. See bug 948406.
+#define EGL_ATTRIBS_LIST_SAFE_TERMINATION_WORKING_AROUND_BUGS \
+  LOCAL_EGL_NONE, 0, 0, 0
+
+static EGLint kTerminationAttribs[] = {
+    EGL_ATTRIBS_LIST_SAFE_TERMINATION_WORKING_AROUND_BUGS};
+
+static int next_power_of_two(int v) {
+  v--;
+  v |= v >> 1;
+  v |= v >> 2;
+  v |= v >> 4;
+  v |= v >> 8;
+  v |= v >> 16;
+  v++;
+
+  return v;
+}
+
+static bool is_power_of_two(int v) {
+  NS_ASSERTION(v >= 0, "bad value");
+
+  if (v == 0) return true;
+
+  return (v & (v - 1)) == 0;
+}
+
+static void DestroySurface(EglDisplay& egl, const EGLSurface oldSurface) {
+  if (oldSurface != EGL_NO_SURFACE) {
+    // TODO: This breaks TLS MakeCurrent caching.
+    egl.fMakeCurrent(EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    egl.fDestroySurface(oldSurface);
+#if defined(MOZ_WAYLAND)
+    DeleteSavedGLSurface(oldSurface);
+#endif
+  }
+}
+
+static EGLSurface CreateFallbackSurface(EglDisplay& egl,
+                                        const EGLConfig& config) {
+  if (egl.IsExtensionSupported(EGLExtension::KHR_surfaceless_context)) {
+    // We don't need a PBuffer surface in this case
+    return EGL_NO_SURFACE;
+  }
+
+  std::vector<EGLint> pbattrs;
+  pbattrs.push_back(LOCAL_EGL_WIDTH);
+  pbattrs.push_back(1);
+  pbattrs.push_back(LOCAL_EGL_HEIGHT);
+  pbattrs.push_back(1);
+
+  for (const auto& cur : kTerminationAttribs) {
+    pbattrs.push_back(cur);
+  }
+
+  EGLSurface surface = egl.fCreatePbufferSurface(config, pbattrs.data());
+  if (!surface) {
+    MOZ_CRASH("Failed to create fallback EGLSurface");
+  }
+
+  return surface;
+}
+
+static EGLSurface CreateSurfaceFromNativeWindow(
+    EglDisplay& egl, const EGLNativeWindowType window, const EGLConfig config) {
+  MOZ_ASSERT(window);
+  EGLSurface newSurface = EGL_NO_SURFACE;
+
+#ifdef MOZ_WIDGET_ANDROID
+  JNIEnv* const env = jni::GetEnvForThread();
+  ANativeWindow* const nativeWindow =
+      ANativeWindow_fromSurface(env, reinterpret_cast<jobject>(window));
+  if (!nativeWindow) {
+    gfxCriticalNote << "Failed to obtain native window from Surface";
+    return EGL_NO_SURFACE;
+  }
+  const auto& display = egl.mLib->fGetDisplay(EGL_DEFAULT_DISPLAY);
+  newSurface = egl.mLib->fCreateWindowSurface(display, config, nativeWindow, 0);
+  ANativeWindow_release(nativeWindow);
+#else
+  newSurface = egl.fCreateWindowSurface(config, window, 0);
+#endif
+  if (!newSurface) {
+    const auto err = egl.mLib->fGetError();
+    gfxCriticalNote << "Failed to create EGLSurface!: " << gfx::hexa(err);
+  }
+  return newSurface;
+}
+
+/* GLContextEGLFactory class was added as a friend of GLContextEGL
+ * so that it could access  GLContextEGL::CreateGLContext. This was
+ * done so that a new function would not need to be added to the shared
+ * GLContextProvider interface.
+ */
+class GLContextEGLFactory {
+ public:
+  static already_AddRefed<GLContext> Create(EGLNativeWindowType aWindow,
+                                            bool aHardwareWebRender);
+  static already_AddRefed<GLContext> CreateImpl(EGLNativeWindowType aWindow,
+                                                bool aHardwareWebRender,
+                                                bool aUseGles);
+
+ private:
+  GLContextEGLFactory() = default;
+  ~GLContextEGLFactory() = default;
+};
+
+already_AddRefed<GLContext> GLContextEGLFactory::CreateImpl(
+    EGLNativeWindowType aWindow, bool aHardwareWebRender, bool aUseGles) {
+  nsCString failureId;
+  const auto lib = GLLibraryEGL::Get(&failureId);
+  if (!lib) {
+    gfxCriticalNote << "Failed[3] to load EGL library: " << failureId.get();
+    return nullptr;
+  }
+  const auto egl = lib->CreateDisplay(true, &failureId);
+  if (!egl) {
+    gfxCriticalNote << "Failed[3] to create EGL library  display: "
+                    << failureId.get();
+    return nullptr;
+  }
+
+  bool doubleBuffered = true;
+
+  EGLConfig config;
+  if (aHardwareWebRender && egl->mLib->IsANGLE()) {
+    // Force enable alpha channel to make sure ANGLE use correct framebuffer
+    // formart
+    const int bpp = 32;
+    if (!CreateConfig(*egl, &config, bpp, false, aUseGles)) {
+      gfxCriticalNote << "Failed to create EGLConfig for WebRender ANGLE!";
+      return nullptr;
+    }
+  } else if (kIsWayland || kIsX11) {
+    const int bpp = 32;
+    if (!CreateConfig(*egl, &config, bpp, false, aUseGles)) {
+      gfxCriticalNote << "Failed to create EGLConfig for WebRender!";
+      return nullptr;
+    }
+  } else {
+    if (!CreateConfigScreen(*egl, &config,
+                            /* aEnableDepthBuffer */ false, aUseGles)) {
+      gfxCriticalNote << "Failed to create EGLConfig!";
+      return nullptr;
+    }
+  }
+
+  EGLSurface surface = EGL_NO_SURFACE;
+  if (aWindow) {
+    surface = mozilla::gl::CreateSurfaceFromNativeWindow(*egl, aWindow, config);
+    if (!surface) {
+      return nullptr;
+    }
+  }
+
+  CreateContextFlags flags = CreateContextFlags::NONE;
+  if (aHardwareWebRender &&
+      StaticPrefs::gfx_webrender_prefer_robustness_AtStartup()) {
+    flags |= CreateContextFlags::PREFER_ROBUSTNESS;
+  }
+  if (aHardwareWebRender && aUseGles) {
+    flags |= CreateContextFlags::PREFER_ES3;
+  }
+  if (!aHardwareWebRender) {
+    flags |= CreateContextFlags::REQUIRE_COMPAT_PROFILE;
+  }
+
+  const auto desc = GLContextDesc{{flags}, false};
+  RefPtr<GLContextEGL> gl = GLContextEGL::CreateGLContext(
+      egl, desc, config, surface, aUseGles, config, &failureId);
+  if (!gl) {
+    const auto err = egl->mLib->fGetError();
+    gfxCriticalNote << "Failed to create EGLContext!: " << gfx::hexa(err);
+    mozilla::gl::DestroySurface(*egl, surface);
+    return nullptr;
+  }
+
+  gl->MakeCurrent();
+  gl->SetIsDoubleBuffered(doubleBuffered);
+
+#ifdef MOZ_WIDGET_GTK
+  if (surface) {
+    const int interval = gfxVars::SwapIntervalEGL() ? 1 : 0;
+    egl->fSwapInterval(interval);
+  }
+#endif
+  if (aHardwareWebRender && egl->mLib->IsANGLE()) {
+    MOZ_ASSERT(doubleBuffered);
+    const int interval = gfxVars::SwapIntervalEGL() ? 1 : 0;
+    egl->fSwapInterval(interval);
+  }
+  return gl.forget();
+}
+
+already_AddRefed<GLContext> GLContextEGLFactory::Create(
+    EGLNativeWindowType aWindow, bool aHardwareWebRender) {
+  bool preferGles;
+#if defined(MOZ_WIDGET_ANDROID)
+  preferGles = true;
+#else
+  preferGles = StaticPrefs::gfx_egl_prefer_gles_enabled_AtStartup();
+#endif  // defined(MOZ_WIDGET_ANDROID)
+
+  RefPtr<GLContext> glContext =
+      CreateImpl(aWindow, aHardwareWebRender, preferGles);
+#if !defined(MOZ_WIDGET_ANDROID)
+  if (!glContext) {
+    glContext = CreateImpl(aWindow, aHardwareWebRender, !preferGles);
+  }
+#endif  // !defined(MOZ_WIDGET_ANDROID)
+  return glContext.forget();
+}
+
+/* static */
+EGLSurface GLContextEGL::CreateEGLSurfaceForCompositorWidget(
+    widget::CompositorWidget* aCompositorWidget, const EGLConfig aConfig) {
+  nsCString discardFailureId;
+  const auto egl = DefaultEglDisplay(&discardFailureId);
+  if (!egl) {
+    gfxCriticalNote << "Failed to load EGL library 6!";
+    return EGL_NO_SURFACE;
+  }
+
+  MOZ_ASSERT(aCompositorWidget);
+#ifdef MOZ_WAYLAND
+  // RenderCompositorEGL does not like EGL_NO_SURFACE as it fallbacks
+  // to SW rendering or claims itself as paused.
+  // In case we're missing valid native window because aCompositorWidget hidden,
+  // just create a fallback EGLSurface.
+  // Actual EGLSurface will be created by widget code later when
+  // aCompositorWidget becomes visible.
+  if (widget::GdkIsWaylandDisplay() && aCompositorWidget->IsHidden()) {
+    mozilla::gfx::IntSize pbSize(16, 16);
+    return CreateWaylandBufferSurface(*egl, aConfig, pbSize);
+  }
+#endif
+  EGLNativeWindowType window =
+      GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aCompositorWidget);
+  if (!window) {
+    gfxCriticalNote << "window is null";
+    return EGL_NO_SURFACE;
+  }
+
+  return mozilla::gl::CreateSurfaceFromNativeWindow(*egl, window, aConfig);
+}
+
+GLContextEGL::GLContextEGL(const std::shared_ptr<EglDisplay> egl,
+                           const GLContextDesc& desc, EGLConfig surfaceConfig,
+                           EGLSurface surface, EGLContext context)
+    : GLContext(desc, nullptr, false),
+      mEgl(egl),
+      mSurfaceConfig(surfaceConfig),
+      mContext(context),
+      mSurface(surface),
+      mFallbackSurface(CreateFallbackSurface(*mEgl, mSurfaceConfig)) {
+#ifdef DEBUG
+  printf_stderr("Initializing context %p surface %p on display %p\n", mContext,
+                mSurface, mEgl->mDisplay);
+#endif
+}
+
+void GLContextEGL::OnMarkDestroyed() {
+  if (mSurfaceOverride != EGL_NO_SURFACE) {
+    SetEGLSurfaceOverride(EGL_NO_SURFACE);
+  }
+}
+
+GLContextEGL::~GLContextEGL() {
+  MarkDestroyed();
+
+  // Wrapped context should not destroy eglContext/Surface
+  if (!mOwnsContext) {
+    return;
+  }
+
+#ifdef DEBUG
+  printf_stderr("Destroying context %p surface %p on display %p\n", mContext,
+                mSurface, mEgl->mDisplay);
+#endif
+
+  mEgl->fDestroyContext(mContext);
+
+  mozilla::gl::DestroySurface(*mEgl, mSurface);
+  mozilla::gl::DestroySurface(*mEgl, mFallbackSurface);
+}
+
+bool GLContextEGL::Init() {
+  if (!GLContext::Init()) return false;
+
+  bool current = MakeCurrent();
+  if (!current) {
+    gfx::LogFailure("Couldn't get device attachments for device."_ns);
+    return false;
+  }
+
+  mShareWithEGLImage =
+      mEgl->HasKHRImageBase() &&
+      mEgl->IsExtensionSupported(EGLExtension::KHR_gl_texture_2D_image) &&
+      IsExtensionSupported(OES_EGL_image);
+
+  return true;
+}
+
+bool GLContextEGL::BindTexImage() {
+  if (!mSurface) return false;
+
+  if (mBound && !ReleaseTexImage()) return false;
+
+  EGLBoolean success =
+      mEgl->fBindTexImage((EGLSurface)mSurface, LOCAL_EGL_BACK_BUFFER);
+  if (success == LOCAL_EGL_FALSE) return false;
+
+  mBound = true;
+  return true;
+}
+
+bool GLContextEGL::ReleaseTexImage() {
+  if (!mBound) return true;
+
+  if (!mSurface) return false;
+
+  EGLBoolean success;
+  success = mEgl->fReleaseTexImage((EGLSurface)mSurface, LOCAL_EGL_BACK_BUFFER);
+  if (success == LOCAL_EGL_FALSE) return false;
+
+  mBound = false;
+  return true;
+}
+
+void GLContextEGL::SetEGLSurfaceOverride(EGLSurface surf) {
+  mSurfaceOverride = surf;
+  DebugOnly<bool> ok = MakeCurrent(true);
+  MOZ_ASSERT(ok);
+}
+
+bool GLContextEGL::MakeCurrentImpl() const {
+  EGLSurface surface =
+      (mSurfaceOverride != EGL_NO_SURFACE) ? mSurfaceOverride : mSurface;
+  if (!surface) {
+    surface = mFallbackSurface;
+  }
+
+  const bool succeeded = mEgl->fMakeCurrent(surface, surface, mContext);
+  if (!succeeded) {
+    const auto eglError = mEgl->mLib->fGetError();
+    if (eglError == LOCAL_EGL_CONTEXT_LOST) {
+      OnContextLostError();
+    } else {
+      NS_WARNING("Failed to make GL context current!");
+#ifdef DEBUG
+      printf_stderr("EGL Error: 0x%04x\n", eglError);
+#endif
+    }
+  }
+
+  return succeeded;
+}
+
+bool GLContextEGL::IsCurrentImpl() const {
+  return mEgl->mLib->fGetCurrentContext() == mContext;
+}
+
+bool GLContextEGL::RenewSurface(CompositorWidget* aWidget) {
+  if (!mOwnsContext) {
+    return false;
+  }
+  // unconditionally release the surface and create a new one. Don't try to
+  // optimize this away. If we get here, then by definition we know that we want
+  // to get a new surface.
+  ReleaseSurface();
+  MOZ_ASSERT(aWidget);
+
+  EGLNativeWindowType nativeWindow =
+      GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aWidget);
+#ifdef MOZ_WAYLAND
+  // In case we're missing native window on Wayland CompositorWidget is hidden.
+  // Don't create a fallback EGL surface but fails here.
+  // We need to repeat RenewSurface() when native window is available
+  // (CompositorWidget becomes visible).
+  if (GdkIsWaylandDisplay()) {
+    NS_WARNING("Failed to get native window");
+    return false;
+  }
+#endif
+  if (nativeWindow) {
+    mSurface = mozilla::gl::CreateSurfaceFromNativeWindow(*mEgl, nativeWindow,
+                                                          mSurfaceConfig);
+    if (!mSurface) {
+      NS_WARNING("Failed to create EGLSurface from native window");
+      return false;
+    }
+  }
+  const bool ok = MakeCurrent(true);
+  MOZ_ASSERT(ok);
+#ifdef MOZ_WIDGET_GTK
+  if (mSurface) {
+    const int interval = gfxVars::SwapIntervalEGL() ? 1 : 0;
+    mEgl->fSwapInterval(interval);
+  }
+#endif
+  return ok;
+}
+
+void GLContextEGL::ReleaseSurface() {
+  if (mOwnsContext) {
+    mozilla::gl::DestroySurface(*mEgl, mSurface);
+  }
+  if (mSurface == mSurfaceOverride) {
+    mSurfaceOverride = EGL_NO_SURFACE;
+  }
+  mSurface = EGL_NO_SURFACE;
+}
+
+Maybe<SymbolLoader> GLContextEGL::GetSymbolLoader() const {
+  return mEgl->mLib->GetSymbolLoader();
+}
+
+bool GLContextEGL::SwapBuffers() {
+  EGLSurface surface =
+      mSurfaceOverride != EGL_NO_SURFACE ? mSurfaceOverride : mSurface;
+  if (surface) {
+    if ((mEgl->IsExtensionSupported(
+             EGLExtension::EXT_swap_buffers_with_damage) ||
+         mEgl->IsExtensionSupported(
+             EGLExtension::KHR_swap_buffers_with_damage))) {
+      std::vector<EGLint> rects;
+      for (auto iter = mDamageRegion.RectIter(); !iter.Done(); iter.Next()) {
+        const IntRect& r = iter.Get();
+        rects.push_back(r.X());
+        rects.push_back(r.Y());
+        rects.push_back(r.Width());
+        rects.push_back(r.Height());
+      }
+      mDamageRegion.SetEmpty();
+      return mEgl->fSwapBuffersWithDamage(surface, rects.data(),
+                                          rects.size() / 4);
+    }
+    return mEgl->fSwapBuffers(surface);
+  } else {
+    return false;
+  }
+}
+
+void GLContextEGL::SetDamage(const nsIntRegion& aDamageRegion) {
+  mDamageRegion = aDamageRegion;
+}
+
+void GLContextEGL::GetWSIInfo(nsCString* const out) const {
+  out->AppendLiteral("EGL_VENDOR: ");
+  out->Append(
+      (const char*)mEgl->mLib->fQueryString(mEgl->mDisplay, LOCAL_EGL_VENDOR));
+
+  out->AppendLiteral("\nEGL_VERSION: ");
+  out->Append(
+      (const char*)mEgl->mLib->fQueryString(mEgl->mDisplay, LOCAL_EGL_VERSION));
+
+  out->AppendLiteral("\nEGL_EXTENSIONS: ");
+  out->Append((const char*)mEgl->mLib->fQueryString(mEgl->mDisplay,
+                                                    LOCAL_EGL_EXTENSIONS));
+
+#ifndef ANDROID  // This query will crash some old android.
+  out->AppendLiteral("\nEGL_EXTENSIONS(nullptr): ");
+  out->Append(
+      (const char*)mEgl->mLib->fQueryString(nullptr, LOCAL_EGL_EXTENSIONS));
+#endif
+}
+
+bool GLContextEGL::HasExtBufferAge() const {
+  return mEgl->IsExtensionSupported(EGLExtension::EXT_buffer_age);
+}
+
+bool GLContextEGL::HasKhrPartialUpdate() const {
+  return mEgl->IsExtensionSupported(EGLExtension::KHR_partial_update);
+}
+
+GLint GLContextEGL::GetBufferAge() const {
+  EGLSurface surface =
+      mSurfaceOverride != EGL_NO_SURFACE ? mSurfaceOverride : mSurface;
+
+  if (surface && (HasExtBufferAge() || HasKhrPartialUpdate())) {
+    EGLint result;
+    mEgl->fQuerySurface(surface, LOCAL_EGL_BUFFER_AGE_EXT, &result);
+    return result;
+  }
+
+  return 0;
+}
+
+#define LOCAL_EGL_CONTEXT_PROVOKING_VERTEX_DONT_CARE_MOZ 0x6000
+
+RefPtr<GLContextEGL> GLContextEGL::CreateGLContext(
+    const std::shared_ptr<EglDisplay> egl, const GLContextDesc& desc,
+    EGLConfig surfaceConfig, EGLSurface surface, const bool useGles,
+    EGLConfig contextConfig, nsACString* const out_failureId) {
+  const auto& flags = desc.flags;
+
+  std::vector<EGLint> required_attribs;
+
+  if (useGles) {
+    // TODO: This fBindAPI could be more thread-safe
+    if (egl->mLib->fBindAPI(LOCAL_EGL_OPENGL_ES_API) == LOCAL_EGL_FALSE) {
+      *out_failureId = "FEATURE_FAILURE_EGL_ES"_ns;
+      NS_WARNING("Failed to bind API to GLES!");
+      return nullptr;
+    }
+    required_attribs.push_back(LOCAL_EGL_CONTEXT_MAJOR_VERSION);
+    if (flags & CreateContextFlags::PREFER_ES3) {
+      required_attribs.push_back(3);
+    } else {
+      required_attribs.push_back(2);
+    }
+  } else {
+    if (egl->mLib->fBindAPI(LOCAL_EGL_OPENGL_API) == LOCAL_EGL_FALSE) {
+      *out_failureId = "FEATURE_FAILURE_EGL"_ns;
+      NS_WARNING("Failed to bind API to GL!");
+      return nullptr;
+    }
+    if (flags & CreateContextFlags::REQUIRE_COMPAT_PROFILE) {
+      required_attribs.push_back(LOCAL_EGL_CONTEXT_OPENGL_PROFILE_MASK);
+      required_attribs.push_back(
+          LOCAL_EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT);
+      required_attribs.push_back(LOCAL_EGL_CONTEXT_MAJOR_VERSION);
+      required_attribs.push_back(2);
+    } else {
+      // !REQUIRE_COMPAT_PROFILE means core profle.
+      required_attribs.push_back(LOCAL_EGL_CONTEXT_OPENGL_PROFILE_MASK);
+      required_attribs.push_back(LOCAL_EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT);
+      required_attribs.push_back(LOCAL_EGL_CONTEXT_MAJOR_VERSION);
+      required_attribs.push_back(3);
+      required_attribs.push_back(LOCAL_EGL_CONTEXT_MINOR_VERSION);
+      required_attribs.push_back(2);
+    }
+  }
+
+  if ((flags & CreateContextFlags::PREFER_EXACT_VERSION) &&
+      egl->mLib->IsANGLE()) {
+    required_attribs.push_back(
+        LOCAL_EGL_CONTEXT_OPENGL_BACKWARDS_COMPATIBLE_ANGLE);
+    required_attribs.push_back(LOCAL_EGL_FALSE);
+  }
+
+  const auto debugFlags = GLContext::ChooseDebugFlags(flags);
+  if (!debugFlags && flags & CreateContextFlags::NO_VALIDATION &&
+      egl->IsExtensionSupported(EGLExtension::KHR_create_context_no_error)) {
+    required_attribs.push_back(LOCAL_EGL_CONTEXT_OPENGL_NO_ERROR_KHR);
+    required_attribs.push_back(LOCAL_EGL_TRUE);
+  }
+
+  if (flags & CreateContextFlags::PROVOKING_VERTEX_DONT_CARE &&
+      egl->IsExtensionSupported(
+          EGLExtension::MOZ_create_context_provoking_vertex_dont_care)) {
+    required_attribs.push_back(
+        LOCAL_EGL_CONTEXT_PROVOKING_VERTEX_DONT_CARE_MOZ);
+    required_attribs.push_back(LOCAL_EGL_TRUE);
+  }
+
+  std::vector<EGLint> ext_robustness_attribs;
+  std::vector<EGLint> ext_rbab_attribs;  // RBAB: Robust Buffer Access Behavior
+  std::vector<EGLint> khr_robustness_attribs;
+  std::vector<EGLint> khr_rbab_attribs;  // RBAB: Robust Buffer Access Behavior
+  if (flags & CreateContextFlags::PREFER_ROBUSTNESS) {
+    std::vector<EGLint> base_robustness_attribs = required_attribs;
+    if (egl->IsExtensionSupported(
+            EGLExtension::NV_robustness_video_memory_purge)) {
+      base_robustness_attribs.push_back(
+          LOCAL_EGL_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV);
+      base_robustness_attribs.push_back(LOCAL_EGL_TRUE);
+    }
+
+    if (egl->IsExtensionSupported(
+            EGLExtension::EXT_create_context_robustness)) {
+      ext_robustness_attribs = base_robustness_attribs;
+      ext_robustness_attribs.push_back(
+          LOCAL_EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT);
+      ext_robustness_attribs.push_back(LOCAL_EGL_LOSE_CONTEXT_ON_RESET_EXT);
+
+      if (gfxVars::AllowEglRbab()) {
+        ext_rbab_attribs = ext_robustness_attribs;
+        ext_rbab_attribs.push_back(LOCAL_EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT);
+        ext_rbab_attribs.push_back(LOCAL_EGL_TRUE);
+      }
+    }
+
+    if (egl->IsExtensionSupported(EGLExtension::KHR_create_context)) {
+      khr_robustness_attribs = base_robustness_attribs;
+      khr_robustness_attribs.push_back(
+          LOCAL_EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR);
+      khr_robustness_attribs.push_back(LOCAL_EGL_LOSE_CONTEXT_ON_RESET_KHR);
+
+      khr_rbab_attribs = khr_robustness_attribs;
+      khr_rbab_attribs.push_back(LOCAL_EGL_CONTEXT_FLAGS_KHR);
+      khr_rbab_attribs.push_back(
+          LOCAL_EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR);
+    }
+  }
+
+  const auto fnCreate = [&](const std::vector<EGLint>& attribs) {
+    auto terminated_attribs = attribs;
+
+    for (const auto& cur : kTerminationAttribs) {
+      terminated_attribs.push_back(cur);
+    }
+
+    return egl->fCreateContext(contextConfig, EGL_NO_CONTEXT,
+                               terminated_attribs.data());
+  };
+
+  EGLContext context;
+  do {
+    if (!khr_rbab_attribs.empty()) {
+      context = fnCreate(khr_rbab_attribs);
+      if (context) break;
+      NS_WARNING("Failed to create EGLContext with khr_rbab_attribs");
+    }
+
+    if (!ext_rbab_attribs.empty()) {
+      context = fnCreate(ext_rbab_attribs);
+      if (context) break;
+      NS_WARNING("Failed to create EGLContext with ext_rbab_attribs");
+    }
+
+    if (!khr_robustness_attribs.empty()) {
+      context = fnCreate(khr_robustness_attribs);
+      if (context) break;
+      NS_WARNING("Failed to create EGLContext with khr_robustness_attribs");
+    }
+
+    if (!ext_robustness_attribs.empty()) {
+      context = fnCreate(ext_robustness_attribs);
+      if (context) break;
+      NS_WARNING("Failed to create EGLContext with ext_robustness_attribs");
+    }
+
+    context = fnCreate(required_attribs);
+    if (context) break;
+    NS_WARNING("Failed to create EGLContext with required_attribs");
+
+    *out_failureId = "FEATURE_FAILURE_EGL_CREATE"_ns;
+    return nullptr;
+  } while (false);
+  MOZ_ASSERT(context);
+
+  RefPtr<GLContextEGL> glContext =
+      new GLContextEGL(egl, desc, surfaceConfig, surface, context);
+  if (!glContext->Init()) {
+    *out_failureId = "FEATURE_FAILURE_EGL_INIT"_ns;
+    return nullptr;
+  }
+
+  if (GLContext::ShouldSpew()) {
+    printf_stderr("new GLContextEGL %p on EGLDisplay %p\n", glContext.get(),
+                  egl->mDisplay);
+  }
+
+  return glContext;
+}
+
+// static
+EGLSurface GLContextEGL::CreatePBufferSurfaceTryingPowerOfTwo(
+    EglDisplay& egl, EGLConfig config, EGLenum bindToTextureFormat,
+    mozilla::gfx::IntSize& pbsize) {
+  nsTArray<EGLint> pbattrs(16);
+  EGLSurface surface = nullptr;
+
+TRY_AGAIN_POWER_OF_TWO:
+  pbattrs.Clear();
+  pbattrs.AppendElement(LOCAL_EGL_WIDTH);
+  pbattrs.AppendElement(pbsize.width);
+  pbattrs.AppendElement(LOCAL_EGL_HEIGHT);
+  pbattrs.AppendElement(pbsize.height);
+
+  if (bindToTextureFormat != LOCAL_EGL_NONE) {
+    pbattrs.AppendElement(LOCAL_EGL_TEXTURE_TARGET);
+    pbattrs.AppendElement(LOCAL_EGL_TEXTURE_2D);
+
+    pbattrs.AppendElement(LOCAL_EGL_TEXTURE_FORMAT);
+    pbattrs.AppendElement(bindToTextureFormat);
+  }
+
+  for (const auto& cur : kTerminationAttribs) {
+    pbattrs.AppendElement(cur);
+  }
+
+  surface = egl.fCreatePbufferSurface(config, &pbattrs[0]);
+  if (!surface) {
+    if (!is_power_of_two(pbsize.width) || !is_power_of_two(pbsize.height)) {
+      if (!is_power_of_two(pbsize.width))
+        pbsize.width = next_power_of_two(pbsize.width);
+      if (!is_power_of_two(pbsize.height))
+        pbsize.height = next_power_of_two(pbsize.height);
+
+      NS_WARNING("Failed to create pbuffer, trying power of two dims");
+      goto TRY_AGAIN_POWER_OF_TWO;
+    }
+
+    NS_WARNING("Failed to create pbuffer surface");
+    return nullptr;
+  }
+
+  return surface;
+}
+
+#if defined(MOZ_WAYLAND)
+SavedGLSurface::SavedGLSurface(struct wl_surface* aWaylandSurface,
+                               struct wl_egl_window* aEGLWindow)
+    : mWaylandSurface(aWaylandSurface), mEGLWindow(aEGLWindow) {}
+
+SavedGLSurface::~SavedGLSurface() {
+  if (mEGLWindow) {
+    wl_egl_window_destroy(mEGLWindow);
+  }
+  if (mWaylandSurface) {
+    wl_surface_destroy(mWaylandSurface);
+  }
+}
+
+// static
+EGLSurface GLContextEGL::CreateWaylandBufferSurface(
+    EglDisplay& egl, EGLConfig config, mozilla::gfx::IntSize& pbsize) {
+  wl_egl_window* eglwindow = nullptr;
+
+  struct wl_compositor* compositor =
+      gdk_wayland_display_get_wl_compositor(gdk_display_get_default());
+  struct wl_surface* wlsurface = wl_compositor_create_surface(compositor);
+  eglwindow = wl_egl_window_create(wlsurface, pbsize.width, pbsize.height);
+  if (!eglwindow) return nullptr;
+
+  const auto surface = egl.fCreateWindowSurface(
+      config, reinterpret_cast<EGLNativeWindowType>(eglwindow), 0);
+  if (surface) {
+    MOZ_ASSERT(!sSavedGLSurfaces.Contains(surface));
+    sSavedGLSurfaces.LookupOrInsert(surface,
+                                    new SavedGLSurface(wlsurface, eglwindow));
+  }
+  return surface;
+}
+#endif
+
+static const EGLint kEGLConfigAttribsRGB16[] = {
+    LOCAL_EGL_SURFACE_TYPE, LOCAL_EGL_WINDOW_BIT,
+    LOCAL_EGL_RED_SIZE,     5,
+    LOCAL_EGL_GREEN_SIZE,   6,
+    LOCAL_EGL_BLUE_SIZE,    5,
+    LOCAL_EGL_ALPHA_SIZE,   0};
+
+static const EGLint kEGLConfigAttribsRGB24[] = {
+    LOCAL_EGL_SURFACE_TYPE, LOCAL_EGL_WINDOW_BIT,
+    LOCAL_EGL_RED_SIZE,     8,
+    LOCAL_EGL_GREEN_SIZE,   8,
+    LOCAL_EGL_BLUE_SIZE,    8,
+    LOCAL_EGL_ALPHA_SIZE,   0};
+
+static const EGLint kEGLConfigAttribsRGBA32[] = {
+    LOCAL_EGL_SURFACE_TYPE, LOCAL_EGL_WINDOW_BIT,
+    LOCAL_EGL_RED_SIZE,     8,
+    LOCAL_EGL_GREEN_SIZE,   8,
+    LOCAL_EGL_BLUE_SIZE,    8,
+    LOCAL_EGL_ALPHA_SIZE,   8};
+
+bool CreateConfig(EglDisplay& aEgl, EGLConfig* aConfig, int32_t aDepth,
+                  bool aEnableDepthBuffer, bool aUseGles, bool aAllowFallback) {
+  EGLConfig configs[64];
+  std::vector<EGLint> attribs;
+  EGLint ncfg = ArrayLength(configs);
+
+  switch (aDepth) {
+    case 16:
+      for (const auto& cur : kEGLConfigAttribsRGB16) {
+        attribs.push_back(cur);
+      }
+      break;
+    case 24:
+      for (const auto& cur : kEGLConfigAttribsRGB24) {
+        attribs.push_back(cur);
+      }
+      break;
+    case 32:
+      for (const auto& cur : kEGLConfigAttribsRGBA32) {
+        attribs.push_back(cur);
+      }
+      break;
+    default:
+      NS_ERROR("Unknown pixel depth");
+      return false;
+  }
+
+  if (aUseGles) {
+    attribs.push_back(LOCAL_EGL_RENDERABLE_TYPE);
+    attribs.push_back(LOCAL_EGL_OPENGL_ES2_BIT);
+  }
+  for (const auto& cur : kTerminationAttribs) {
+    attribs.push_back(cur);
+  }
+
+  if (!aEgl.fChooseConfig(attribs.data(), configs, ncfg, &ncfg) || ncfg < 1) {
+    return false;
+  }
+
+  Maybe<EGLConfig> fallbackConfig;
+
+  for (int j = 0; j < ncfg; ++j) {
+    EGLConfig config = configs[j];
+    EGLint r, g, b, a;
+    if (aEgl.fGetConfigAttrib(config, LOCAL_EGL_RED_SIZE, &r) &&
+        aEgl.fGetConfigAttrib(config, LOCAL_EGL_GREEN_SIZE, &g) &&
+        aEgl.fGetConfigAttrib(config, LOCAL_EGL_BLUE_SIZE, &b) &&
+        aEgl.fGetConfigAttrib(config, LOCAL_EGL_ALPHA_SIZE, &a) &&
+        ((aDepth == 16 && r == 5 && g == 6 && b == 5) ||
+         (aDepth == 24 && r == 8 && g == 8 && b == 8) ||
+         (aDepth == 32 && r == 8 && g == 8 && b == 8 && a == 8))) {
+      EGLint z;
+      if (aEnableDepthBuffer) {
+        if (!aEgl.fGetConfigAttrib(config, LOCAL_EGL_DEPTH_SIZE, &z) ||
+            z != 24) {
+          continue;
+        }
+      }
+#ifdef MOZ_X11
+      if (GdkIsX11Display()) {
+        int configVisualID;
+        if (!aEgl.fGetConfigAttrib(config, LOCAL_EGL_NATIVE_VISUAL_ID,
+                                   &configVisualID)) {
+          continue;
+        }
+
+        XVisualInfo visual_info_template, *visual_info;
+        int num_visuals;
+
+        visual_info_template.visualid = configVisualID;
+        visual_info =
+            XGetVisualInfo(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
+                           VisualIDMask, &visual_info_template, &num_visuals);
+
+        if (!visual_info || visual_info->depth != aDepth) {
+          if (aAllowFallback && !fallbackConfig) {
+            fallbackConfig = Some(config);
+          }
+          continue;
+        }
+      }
+#endif
+      *aConfig = config;
+      return true;
+    }
+  }
+
+  if (kIsX11 && fallbackConfig) {
+    *aConfig = fallbackConfig.value();
+    return true;
+  }
+
+  return false;
+}
+
+// Return true if a suitable EGLConfig was found and pass it out
+// through aConfig.  Return false otherwise.
+//
+// NB: It's entirely legal for the returned EGLConfig to be valid yet
+// have the value null.
+static bool CreateConfigScreen(EglDisplay& egl, EGLConfig* const aConfig,
+                               const bool aEnableDepthBuffer,
+                               const bool aUseGles) {
+  int32_t depth = gfxVars::ScreenDepth();
+  if (CreateConfig(egl, aConfig, depth, aEnableDepthBuffer, aUseGles)) {
+    return true;
+  }
+#ifdef MOZ_WIDGET_ANDROID
+  // Bug 736005
+  // Android doesn't always support 16 bit so also try 24 bit
+  if (depth == 16) {
+    return CreateConfig(egl, aConfig, 24, aEnableDepthBuffer, aUseGles);
+  }
+  // Bug 970096
+  // Some devices that have 24 bit screens only support 16 bit OpenGL?
+  if (depth == 24) {
+    return CreateConfig(egl, aConfig, 16, aEnableDepthBuffer, aUseGles);
+  }
+#endif
+  return false;
+}
+
+already_AddRefed<GLContext> GLContextProviderEGL::CreateForCompositorWidget(
+    CompositorWidget* aCompositorWidget, bool aHardwareWebRender,
+    bool /*aForceAccelerated*/) {
+  EGLNativeWindowType window = nullptr;
+  if (aCompositorWidget) {
+    window = GET_NATIVE_WINDOW_FROM_COMPOSITOR_WIDGET(aCompositorWidget);
+  }
+  return GLContextEGLFactory::Create(window, aHardwareWebRender);
+}
+
+EGLSurface GLContextEGL::CreateCompatibleSurface(void* aWindow) const {
+  MOZ_ASSERT(aWindow);
+  MOZ_RELEASE_ASSERT(mSurfaceConfig != EGL_NO_CONFIG);
+
+  // NOTE: aWindow is an ANativeWindow
+  EGLSurface surface = mEgl->fCreateWindowSurface(
+      mSurfaceConfig, reinterpret_cast<EGLNativeWindowType>(aWindow), nullptr);
+  if (!surface) {
+    gfxCriticalError() << "CreateCompatibleSurface failed: "
+                       << hexa(GetError());
+  }
+  return surface;
+}
+
+static void FillContextAttribs(bool es3, bool useGles, nsTArray<EGLint>* out) {
+  out->AppendElement(LOCAL_EGL_SURFACE_TYPE);
+#ifdef MOZ_WAYLAND
+  if (GdkIsWaylandDisplay()) {
+    // Wayland on desktop does not support PBuffer or FBO.
+    // We create a dummy wl_egl_window instead.
+    out->AppendElement(LOCAL_EGL_WINDOW_BIT);
+  } else
+#endif
+  {
+    out->AppendElement(LOCAL_EGL_PBUFFER_BIT);
+  }
+
+  if (useGles) {
+    out->AppendElement(LOCAL_EGL_RENDERABLE_TYPE);
+    if (es3) {
+      out->AppendElement(LOCAL_EGL_OPENGL_ES3_BIT_KHR);
+    } else {
+      out->AppendElement(LOCAL_EGL_OPENGL_ES2_BIT);
+    }
+  }
+
+  out->AppendElement(LOCAL_EGL_RED_SIZE);
+  out->AppendElement(8);
+
+  out->AppendElement(LOCAL_EGL_GREEN_SIZE);
+  out->AppendElement(8);
+
+  out->AppendElement(LOCAL_EGL_BLUE_SIZE);
+  out->AppendElement(8);
+
+  out->AppendElement(LOCAL_EGL_ALPHA_SIZE);
+  out->AppendElement(8);
+
+  out->AppendElement(LOCAL_EGL_DEPTH_SIZE);
+  out->AppendElement(0);
+
+  out->AppendElement(LOCAL_EGL_STENCIL_SIZE);
+  out->AppendElement(0);
+
+  // EGL_ATTRIBS_LIST_SAFE_TERMINATION_WORKING_AROUND_BUGS
+  out->AppendElement(LOCAL_EGL_NONE);
+  out->AppendElement(0);
+
+  out->AppendElement(0);
+  out->AppendElement(0);
+}
+
+/*
+/// Useful for debugging, but normally unused.
+static GLint GetAttrib(GLLibraryEGL* egl, EGLConfig config, EGLint attrib) {
+  EGLint bits = 0;
+  egl->fGetConfigAttrib(config, attrib, &bits);
+  MOZ_ASSERT(egl->fGetError() == LOCAL_EGL_SUCCESS);
+
+  return bits;
+}
+*/
+
+static EGLConfig ChooseConfig(EglDisplay& egl, const GLContextCreateDesc& desc,
+                              const bool useGles) {
+  nsTArray<EGLint> configAttribList;
+  FillContextAttribs(bool(desc.flags & CreateContextFlags::PREFER_ES3), useGles,
+                     &configAttribList);
+
+  const EGLint* configAttribs = configAttribList.Elements();
+
+  // The sorting dictated by the spec for eglChooseConfig reasonably assures
+  // that a reasonable 'best' config is on top.
+  const EGLint kMaxConfigs = 1;
+  EGLConfig configs[kMaxConfigs];
+  EGLint foundConfigs = 0;
+  if (!egl.fChooseConfig(configAttribs, configs, kMaxConfigs, &foundConfigs) ||
+      foundConfigs == 0) {
+    return EGL_NO_CONFIG;
+  }
+
+  EGLConfig config = configs[0];
+  return config;
+}
+
+#ifdef MOZ_X11
+/* static */
+bool GLContextEGL::FindVisual(int* const out_visualId) {
+  nsCString discardFailureId;
+  const auto egl = DefaultEglDisplay(&discardFailureId);
+  if (!egl) {
+    gfxCriticalNote
+        << "GLContextEGL::FindVisual(): Failed to load EGL library!";
+    return false;
+  }
+
+  EGLConfig config;
+  const int bpp = 32;
+  if (!CreateConfig(*egl, &config, bpp, /* aEnableDepthBuffer */ false,
+                    /* aUseGles */ false, /* aAllowFallback */ false)) {
+    // We are on a buggy driver. Do not return a visual so a fallback path can
+    // be used. See https://gitlab.freedesktop.org/mesa/mesa/-/issues/149
+    return false;
+  }
+  if (egl->fGetConfigAttrib(config, LOCAL_EGL_NATIVE_VISUAL_ID, out_visualId)) {
+    return true;
+  }
+  return false;
+}
+#endif
+
+/*static*/
+RefPtr<GLContextEGL> GLContextEGL::CreateWithoutSurface(
+    const std::shared_ptr<EglDisplay> egl, const GLContextCreateDesc& desc,
+    nsACString* const out_failureId) {
+  const auto WithUseGles = [&](const bool useGles) -> RefPtr<GLContextEGL> {
+#ifdef MOZ_WIDGET_GTK
+    // First try creating a context with no config and no surface, this is what
+    // we really want, and seems to be the only way to make selecting software
+    // Mesa init properly when it's not the first device.
+    if (egl->IsExtensionSupported(EGLExtension::KHR_no_config_context) &&
+        egl->IsExtensionSupported(EGLExtension::KHR_surfaceless_context)) {
+      // These extensions have been supported by mesa and nvidia drivers
+      // since 2014 or earlier, this is the preferred code path
+      auto fullDesc = GLContextDesc{desc};
+      fullDesc.isOffscreen = true;
+      RefPtr<GLContextEGL> gl = GLContextEGL::CreateGLContext(
+          egl, fullDesc, EGL_NO_CONFIG, EGL_NO_SURFACE, useGles, EGL_NO_CONFIG,
+          out_failureId);
+      if (gl) {
+        return gl;
+      }
+      NS_WARNING(
+          "Failed to create GLContext with no config and no surface, will try "
+          "ChooseConfig");
+    }
+#endif
+
+    const EGLConfig surfaceConfig = ChooseConfig(*egl, desc, useGles);
+    if (surfaceConfig == EGL_NO_CONFIG) {
+      *out_failureId = "FEATURE_FAILURE_EGL_NO_CONFIG"_ns;
+      NS_WARNING("Failed to find a compatible config.");
+      return nullptr;
+    }
+
+    if (GLContext::ShouldSpew()) {
+      egl->DumpEGLConfig(surfaceConfig);
+    }
+    const EGLConfig contextConfig =
+        egl->IsExtensionSupported(EGLExtension::KHR_no_config_context)
+            ? nullptr
+            : surfaceConfig;
+
+    auto dummySize = mozilla::gfx::IntSize{16, 16};
+    EGLSurface surface = nullptr;
+#ifdef MOZ_WAYLAND
+    if (GdkIsWaylandDisplay()) {
+      surface = GLContextEGL::CreateWaylandBufferSurface(*egl, surfaceConfig,
+                                                         dummySize);
+    } else
+#endif
+    {
+      surface = GLContextEGL::CreatePBufferSurfaceTryingPowerOfTwo(
+          *egl, surfaceConfig, LOCAL_EGL_NONE, dummySize);
+    }
+    if (!surface) {
+      *out_failureId = "FEATURE_FAILURE_EGL_POT"_ns;
+      NS_WARNING("Failed to create PBuffer for context!");
+      return nullptr;
+    }
+
+    auto fullDesc = GLContextDesc{desc};
+    fullDesc.isOffscreen = true;
+    RefPtr<GLContextEGL> gl =
+        GLContextEGL::CreateGLContext(egl, fullDesc, surfaceConfig, surface,
+                                      useGles, contextConfig, out_failureId);
+    if (!gl) {
+      NS_WARNING("Failed to create GLContext from PBuffer");
+      egl->fDestroySurface(surface);
+#if defined(MOZ_WAYLAND)
+      DeleteSavedGLSurface(surface);
+#endif
+      return nullptr;
+    }
+
+    return gl;
+  };
+
+  bool preferGles;
+#if defined(MOZ_WIDGET_ANDROID)
+  preferGles = true;
+#else
+  preferGles = StaticPrefs::gfx_egl_prefer_gles_enabled_AtStartup();
+#endif  // defined(MOZ_WIDGET_ANDROID)
+  RefPtr<GLContextEGL> gl = WithUseGles(preferGles);
+#if !defined(MOZ_WIDGET_ANDROID)
+  if (!gl) {
+    gl = WithUseGles(!preferGles);
+  }
+#endif  // !defined(MOZ_WIDGET_ANDROID)
+  return gl;
+}
+
+/*static*/
+already_AddRefed<GLContext> GLContextProviderEGL::CreateHeadless(
+    const GLContextCreateDesc& desc, nsACString* const out_failureId) {
+  const auto display = DefaultEglDisplay(out_failureId);
+  if (!display) {
+    return nullptr;
+  }
+  auto ret = GLContextEGL::CreateWithoutSurface(display, desc, out_failureId);
+  return ret.forget();
+}
+
+// Don't want a global context on Android as 1) share groups across 2 threads
+// fail on many Tegra drivers (bug 759225) and 2) some mobile devices have a
+// very strict limit on global number of GL contexts (bug 754257) and 3) each
+// EGL context eats 750k on B2G (bug 813783)
+/*static*/
+GLContext* GLContextProviderEGL::GetGlobalContext() { return nullptr; }
+
+// -
+
+/*static*/ void GLContextProviderEGL::Shutdown() { GLLibraryEGL::Shutdown(); }
+
+} /* namespace gl */
+} /* namespace mozilla */
+
+#undef EGL_ATTRIBS_LIST_SAFE_TERMINATION_WORKING_AROUND_BUGS