Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 2506 insertions, 0 deletions

diff --git a/gfx/angle/checkout/src/libANGLE/Display.cpp b/gfx/angle/checkout/src/libANGLE/Display.cpp
new file mode 100644
index 0000000000..4b7ced36fb
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/Display.cpp
@@ -0,0 +1,2506 @@
+//
+// Copyright 2002 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// Display.cpp: Implements the egl::Display class, representing the abstract
+// display on which graphics are drawn. Implements EGLDisplay.
+// [EGL 1.4] section 2.1.2 page 3.
+
+#include "libANGLE/Display.h"
+
+#include <algorithm>
+#include <iterator>
+#include <sstream>
+#include <vector>
+
+#include <EGL/eglext.h>
+#include <platform/PlatformMethods.h>
+
+#include "anglebase/no_destructor.h"
+#include "common/android_util.h"
+#include "common/debug.h"
+#include "common/mathutil.h"
+#include "common/platform.h"
+#include "common/string_utils.h"
+#include "common/system_utils.h"
+#include "common/tls.h"
+#include "common/utilities.h"
+#include "gpu_info_util/SystemInfo.h"
+#include "libANGLE/Context.h"
+#include "libANGLE/Device.h"
+#include "libANGLE/EGLSync.h"
+#include "libANGLE/Image.h"
+#include "libANGLE/ResourceManager.h"
+#include "libANGLE/Stream.h"
+#include "libANGLE/Surface.h"
+#include "libANGLE/Thread.h"
+#include "libANGLE/capture/FrameCapture.h"
+#include "libANGLE/histogram_macros.h"
+#include "libANGLE/renderer/DeviceImpl.h"
+#include "libANGLE/renderer/DisplayImpl.h"
+#include "libANGLE/renderer/ImageImpl.h"
+#include "libANGLE/trace.h"
+
+#if defined(ANGLE_ENABLE_D3D9) || defined(ANGLE_ENABLE_D3D11)
+#    include <versionhelpers.h>
+
+#    include "libANGLE/renderer/d3d/DisplayD3D.h"
+#endif
+
+#if defined(ANGLE_ENABLE_OPENGL)
+#    if defined(ANGLE_PLATFORM_WINDOWS)
+#        include "libANGLE/renderer/gl/wgl/DisplayWGL.h"
+#    elif defined(ANGLE_PLATFORM_MACOS) || defined(ANGLE_PLATFORM_IOS)
+#        include "libANGLE/renderer/gl/apple/DisplayApple_api.h"
+#    elif defined(ANGLE_PLATFORM_LINUX)
+#        include "libANGLE/renderer/gl/egl/DisplayEGL.h"
+#        if defined(ANGLE_USE_GBM)
+#            include "libANGLE/renderer/gl/egl/gbm/DisplayGbm.h"
+#        endif
+#        if defined(ANGLE_USE_X11)
+#            include "libANGLE/renderer/gl/glx/DisplayGLX.h"
+#        endif
+#    elif defined(ANGLE_PLATFORM_ANDROID)
+#        include "libANGLE/renderer/gl/egl/android/DisplayAndroid.h"
+#    else
+#        error Unsupported OpenGL platform.
+#    endif
+#endif
+
+#if defined(ANGLE_ENABLE_NULL)
+#    include "libANGLE/renderer/null/DisplayNULL.h"
+#endif  // defined(ANGLE_ENABLE_NULL)
+
+#if defined(ANGLE_ENABLE_VULKAN)
+#    include "libANGLE/renderer/vulkan/DisplayVk_api.h"
+#endif  // defined(ANGLE_ENABLE_VULKAN)
+
+#if defined(ANGLE_ENABLE_METAL)
+#    include "libANGLE/renderer/metal/DisplayMtl_api.h"
+#endif  // defined(ANGLE_ENABLE_METAL)
+
+namespace egl
+{
+
+namespace
+{
+
+constexpr angle::SubjectIndex kGPUSwitchedSubjectIndex = 0;
+
+static constexpr size_t kWindowSurfaceMapSize = 32;
+typedef angle::FlatUnorderedMap<EGLNativeWindowType, Surface *, kWindowSurfaceMapSize>
+    WindowSurfaceMap;
+// Get a map of all EGL window surfaces to validate that no window has more than one EGL surface
+// associated with it.
+static WindowSurfaceMap *GetWindowSurfaces()
+{
+    static angle::base::NoDestructor<WindowSurfaceMap> windowSurfaces;
+    return windowSurfaces.get();
+}
+
+struct ANGLEPlatformDisplay
+{
+    ANGLEPlatformDisplay() = default;
+
+    ANGLEPlatformDisplay(EGLNativeDisplayType nativeDisplayType)
+        : nativeDisplayType(nativeDisplayType)
+    {}
+
+    ANGLEPlatformDisplay(EGLNativeDisplayType nativeDisplayType,
+                         EGLAttrib powerPreference,
+                         EGLAttrib platformANGLEType,
+                         EGLAttrib deviceIdHigh,
+                         EGLAttrib deviceIdLow)
+        : nativeDisplayType(nativeDisplayType),
+          powerPreference(powerPreference),
+          platformANGLEType(platformANGLEType),
+          deviceIdHigh(deviceIdHigh),
+          deviceIdLow(deviceIdLow)
+    {}
+
+    auto tie() const
+    {
+        return std::tie(nativeDisplayType, powerPreference, platformANGLEType, deviceIdHigh,
+                        deviceIdLow);
+    }
+
+    EGLNativeDisplayType nativeDisplayType{EGL_DEFAULT_DISPLAY};
+    EGLAttrib powerPreference{EGL_LOW_POWER_ANGLE};
+    EGLAttrib platformANGLEType{EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE};
+    EGLAttrib deviceIdHigh{0};
+    EGLAttrib deviceIdLow{0};
+};
+
+inline bool operator==(const ANGLEPlatformDisplay &a, const ANGLEPlatformDisplay &b)
+{
+    return a.tie() == b.tie();
+}
+
+static constexpr size_t kANGLEPlatformDisplayMapSize = 9;
+typedef angle::FlatUnorderedMap<ANGLEPlatformDisplay, Display *, kANGLEPlatformDisplayMapSize>
+    ANGLEPlatformDisplayMap;
+static ANGLEPlatformDisplayMap *GetANGLEPlatformDisplayMap()
+{
+    static angle::base::NoDestructor<ANGLEPlatformDisplayMap> displays;
+    return displays.get();
+}
+
+static constexpr size_t kDevicePlatformDisplayMapSize = 8;
+typedef angle::FlatUnorderedMap<Device *, Display *, kDevicePlatformDisplayMapSize>
+    DevicePlatformDisplayMap;
+static DevicePlatformDisplayMap *GetDevicePlatformDisplayMap()
+{
+    static angle::base::NoDestructor<DevicePlatformDisplayMap> displays;
+    return displays.get();
+}
+
+rx::DisplayImpl *CreateDisplayFromDevice(Device *eglDevice, const DisplayState &state)
+{
+    rx::DisplayImpl *impl = nullptr;
+
+    switch (eglDevice->getType())
+    {
+#if defined(ANGLE_ENABLE_D3D11)
+        case EGL_D3D11_DEVICE_ANGLE:
+            impl = new rx::DisplayD3D(state);
+            break;
+#endif
+#if defined(ANGLE_ENABLE_D3D9)
+        case EGL_D3D9_DEVICE_ANGLE:
+            // Currently the only way to get EGLDeviceEXT representing a D3D9 device
+            // is to retrieve one from an already-existing EGLDisplay.
+            // When eglGetPlatformDisplayEXT is called with a D3D9 EGLDeviceEXT,
+            // the already-existing display should be returned.
+            // Therefore this codepath to create a new display from the device
+            // should never be hit.
+            UNREACHABLE();
+            break;
+#endif
+        default:
+            UNREACHABLE();
+            break;
+    }
+
+    ASSERT(impl != nullptr);
+    return impl;
+}
+
+// On platforms with support for multiple back-ends, allow an environment variable to control
+// the default.  This is useful to run angle with benchmarks without having to modify the
+// benchmark source.  Possible values for this environment variable (ANGLE_DEFAULT_PLATFORM)
+// are: vulkan, gl, d3d11, null.
+EGLAttrib GetDisplayTypeFromEnvironment()
+{
+    std::string angleDefaultEnv = angle::GetEnvironmentVar("ANGLE_DEFAULT_PLATFORM");
+    angle::ToLower(&angleDefaultEnv);
+
+#if defined(ANGLE_ENABLE_VULKAN)
+    if ((angleDefaultEnv == "vulkan") || (angleDefaultEnv == "vulkan-null") ||
+        (angleDefaultEnv == "swiftshader"))
+    {
+        return EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE;
+    }
+#endif
+
+#if defined(ANGLE_ENABLE_OPENGL)
+    if (angleDefaultEnv == "gl")
+    {
+        return EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE;
+    }
+#endif
+
+#if defined(ANGLE_ENABLE_D3D11)
+    if (angleDefaultEnv == "d3d11")
+    {
+        return EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE;
+    }
+#endif
+
+#if defined(ANGLE_ENABLE_METAL)
+    if (angleDefaultEnv == "metal")
+    {
+        return EGL_PLATFORM_ANGLE_TYPE_METAL_ANGLE;
+    }
+#endif
+
+#if defined(ANGLE_ENABLE_NULL)
+    if (angleDefaultEnv == "null")
+    {
+        return EGL_PLATFORM_ANGLE_TYPE_NULL_ANGLE;
+    }
+#endif
+#if defined(ANGLE_ENABLE_METAL)
+    if (angleDefaultEnv == "metal")
+    {
+        return EGL_PLATFORM_ANGLE_TYPE_METAL_ANGLE;
+    }
+
+#endif
+#if defined(ANGLE_ENABLE_D3D11)
+    return EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE;
+#elif defined(ANGLE_ENABLE_D3D9)
+    return EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE;
+#elif defined(ANGLE_ENABLE_VULKAN) && defined(ANGLE_PLATFORM_ANDROID)
+    return EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE;
+#elif defined(ANGLE_ENABLE_OPENGL)
+#    if defined(ANGLE_PLATFORM_ANDROID) || defined(ANGLE_USE_GBM)
+    return EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE;
+#    else
+    return EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE;
+#    endif
+#elif defined(ANGLE_ENABLE_METAL)
+    return EGL_PLATFORM_ANGLE_TYPE_METAL_ANGLE;
+#elif defined(ANGLE_ENABLE_VULKAN)
+    return EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE;
+#elif defined(ANGLE_ENABLE_NULL)
+    return EGL_PLATFORM_ANGLE_TYPE_NULL_ANGLE;
+#else
+#    error No default ANGLE platform type
+#endif
+}
+
+EGLAttrib GetDeviceTypeFromEnvironment()
+{
+    std::string angleDefaultEnv = angle::GetEnvironmentVar("ANGLE_DEFAULT_PLATFORM");
+    angle::ToLower(&angleDefaultEnv);
+
+#if defined(ANGLE_ENABLE_VULKAN)
+    if (angleDefaultEnv == "vulkan-null")
+    {
+        return EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE;
+    }
+    else if (angleDefaultEnv == "swiftshader")
+    {
+        return EGL_PLATFORM_ANGLE_DEVICE_TYPE_SWIFTSHADER_ANGLE;
+    }
+#endif
+    return EGL_PLATFORM_ANGLE_DEVICE_TYPE_HARDWARE_ANGLE;
+}
+
+EGLAttrib GetPlatformTypeFromEnvironment()
+{
+#if defined(ANGLE_USE_OZONE)
+    return 0;
+#elif defined(ANGLE_USE_X11)
+    return EGL_PLATFORM_X11_EXT;
+#elif defined(ANGLE_USE_WAYLAND)
+    return EGL_PLATFORM_WAYLAND_EXT;
+#elif defined(ANGLE_USE_VULKAN_DISPLAY) && defined(ANGLE_VULKAN_DISPLAY_MODE_SIMPLE)
+    return EGL_PLATFORM_VULKAN_DISPLAY_MODE_SIMPLE_ANGLE;
+#elif defined(ANGLE_USE_VULKAN_DISPLAY) && defined(ANGLE_VULKAN_DISPLAY_MODE_HEADLESS)
+    return EGL_PLATFORM_VULKAN_DISPLAY_MODE_HEADLESS_ANGLE;
+#else
+    return 0;
+#endif  // defined(ANGLE_USE_OZONE)
+}
+
+rx::DisplayImpl *CreateDisplayFromAttribs(EGLAttrib displayType,
+                                          EGLAttrib deviceType,
+                                          EGLAttrib platformType,
+                                          const DisplayState &state)
+{
+    ASSERT(displayType != EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE);
+    rx::DisplayImpl *impl = nullptr;
+
+    switch (displayType)
+    {
+        case EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE:
+            UNREACHABLE();
+            break;
+
+        case EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE:
+        case EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE:
+#if defined(ANGLE_ENABLE_D3D9) || defined(ANGLE_ENABLE_D3D11)
+            impl = new rx::DisplayD3D(state);
+            break;
+#else
+            // A D3D display was requested on a platform that doesn't support it
+            UNREACHABLE();
+            break;
+#endif
+
+        case EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE:
+#if defined(ANGLE_ENABLE_OPENGL)
+#    if defined(ANGLE_PLATFORM_WINDOWS)
+            impl = new rx::DisplayWGL(state);
+            break;
+
+#    elif defined(ANGLE_PLATFORM_MACOS) || defined(ANGLE_PLATFORM_IOS)
+            impl = rx::CreateDisplayCGLOrEAGL(state);
+            break;
+
+#    elif defined(ANGLE_PLATFORM_LINUX)
+#        if defined(ANGLE_USE_GBM)
+            if (platformType == 0)
+            {
+                // If platformType is unknown, use DisplayGbm now. In the future, it should use
+                // DisplayEGL letting native EGL decide what display to use.
+                impl = new rx::DisplayGbm(state);
+                break;
+            }
+#        endif
+            if (deviceType == EGL_PLATFORM_ANGLE_DEVICE_TYPE_EGL_ANGLE)
+            {
+                impl = new rx::DisplayEGL(state);
+                break;
+            }
+#        if defined(ANGLE_USE_X11)
+            if (platformType == EGL_PLATFORM_X11_EXT)
+            {
+                impl = new rx::DisplayGLX(state);
+                break;
+            }
+#        endif
+            break;
+
+#    elif defined(ANGLE_PLATFORM_ANDROID)
+            // No GL support on this platform, fail display creation.
+            impl = nullptr;
+            break;
+
+#    else
+#        error Unsupported OpenGL platform.
+#    endif
+#else
+            // No display available
+            UNREACHABLE();
+            break;
+
+#endif  // defined(ANGLE_ENABLE_OPENGL)
+
+        case EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE:
+#if defined(ANGLE_ENABLE_OPENGL)
+#    if defined(ANGLE_PLATFORM_WINDOWS)
+            impl = new rx::DisplayWGL(state);
+#    elif defined(ANGLE_PLATFORM_LINUX)
+#        if defined(ANGLE_USE_GBM)
+            if (platformType == 0 ||
+                platformType == EGL_PLATFORM_VULKAN_DISPLAY_MODE_HEADLESS_ANGLE)
+            {
+                // If platformType is unknown, use DisplayGbm now. In the future, it should use
+                // DisplayEGL letting native EGL decide what display to use.
+                // platformType == EGL_PLATFORM_VULKAN_DISPLAY_MODE_HEADLESS_ANGLE is a hack,
+                // to allow ChromeOS GLES backend to continue functioning when Vulkan is enabled.
+                impl = new rx::DisplayGbm(state);
+                break;
+            }
+#        endif
+            if (deviceType == EGL_PLATFORM_ANGLE_DEVICE_TYPE_EGL_ANGLE)
+            {
+                impl = new rx::DisplayEGL(state);
+                break;
+            }
+            else
+            {
+#        if defined(ANGLE_USE_X11)
+                if (platformType == EGL_PLATFORM_X11_EXT)
+                {
+                    impl = new rx::DisplayGLX(state);
+                    break;
+                }
+#        endif
+            }
+#    elif defined(ANGLE_PLATFORM_ANDROID)
+            impl = new rx::DisplayAndroid(state);
+#    else
+            // No GLES support on this platform, fail display creation.
+            impl = nullptr;
+#    endif
+#endif  // defined(ANGLE_ENABLE_OPENGL)
+            break;
+
+        case EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE:
+#if defined(ANGLE_ENABLE_VULKAN)
+#    if defined(ANGLE_USE_VULKAN_NULL_DISPLAY)
+            if (rx::IsVulkanNullDisplayAvailable())
+            {
+                impl = rx::CreateVulkanNullDisplay(state);
+            }
+            break;
+#    elif defined(ANGLE_PLATFORM_WINDOWS)
+            if (rx::IsVulkanWin32DisplayAvailable())
+            {
+                impl = rx::CreateVulkanWin32Display(state);
+            }
+            break;
+#    elif defined(ANGLE_PLATFORM_LINUX)
+#        if defined(ANGLE_USE_GBM)
+            if (platformType == EGL_PLATFORM_GBM_KHR && rx::IsVulkanGbmDisplayAvailable())
+            {
+                impl = rx::CreateVulkanGbmDisplay(state);
+                break;
+            }
+#        endif
+#        if defined(ANGLE_USE_X11)
+            if (platformType == EGL_PLATFORM_X11_EXT && rx::IsVulkanXcbDisplayAvailable())
+            {
+                impl = rx::CreateVulkanXcbDisplay(state);
+                break;
+            }
+#        endif
+#        if defined(ANGLE_USE_WAYLAND)
+            if (platformType == EGL_PLATFORM_WAYLAND_EXT && rx::IsVulkanWaylandDisplayAvailable())
+            {
+                impl = rx::CreateVulkanWaylandDisplay(state);
+                break;
+            }
+#        endif
+#        if defined(ANGLE_USE_VULKAN_DISPLAY)
+            if (platformType == EGL_PLATFORM_VULKAN_DISPLAY_MODE_SIMPLE_ANGLE &&
+                rx::IsVulkanSimpleDisplayAvailable())
+            {
+                impl = rx::CreateVulkanSimpleDisplay(state);
+            }
+            else if (platformType == EGL_PLATFORM_VULKAN_DISPLAY_MODE_HEADLESS_ANGLE &&
+                     rx::IsVulkanHeadlessDisplayAvailable())
+            {
+                impl = rx::CreateVulkanHeadlessDisplay(state);
+            }
+            else
+            {
+                // Not supported creation type on vulkan display, fail display creation.
+                impl = nullptr;
+            }
+#        endif
+            break;
+#    elif defined(ANGLE_PLATFORM_ANDROID)
+            if (rx::IsVulkanAndroidDisplayAvailable())
+            {
+                impl = rx::CreateVulkanAndroidDisplay(state);
+            }
+            break;
+#    elif defined(ANGLE_PLATFORM_FUCHSIA)
+            if (rx::IsVulkanFuchsiaDisplayAvailable())
+            {
+                impl = rx::CreateVulkanFuchsiaDisplay(state);
+            }
+            break;
+#    elif defined(ANGLE_PLATFORM_GGP)
+            if (rx::IsVulkanGGPDisplayAvailable())
+            {
+                impl = rx::CreateVulkanGGPDisplay(state);
+            }
+            break;
+#    elif defined(ANGLE_PLATFORM_APPLE)
+            if (rx::IsVulkanMacDisplayAvailable())
+            {
+                impl = rx::CreateVulkanMacDisplay(state);
+            }
+            break;
+#    else
+#        error Unsupported Vulkan platform.
+#    endif
+#else
+            // No display available
+            UNREACHABLE();
+            break;
+#endif  // defined(ANGLE_ENABLE_VULKAN)
+
+        case EGL_PLATFORM_ANGLE_TYPE_METAL_ANGLE:
+#if defined(ANGLE_ENABLE_METAL)
+            if (rx::IsMetalDisplayAvailable())
+            {
+                impl = rx::CreateMetalDisplay(state);
+                break;
+            }
+#endif
+            // No display available
+            UNREACHABLE();
+            break;
+
+        case EGL_PLATFORM_ANGLE_TYPE_NULL_ANGLE:
+#if defined(ANGLE_ENABLE_NULL)
+            impl = new rx::DisplayNULL(state);
+            break;
+#else
+            // No display available
+            UNREACHABLE();
+            break;
+#endif  // defined(ANGLE_ENABLE_NULL)
+
+        default:
+            UNREACHABLE();
+            break;
+    }
+
+    return impl;
+}
+
+void Display_logError(angle::PlatformMethods *platform, const char *errorMessage)
+{
+    gl::Trace(gl::LOG_ERR, errorMessage);
+}
+
+void Display_logWarning(angle::PlatformMethods *platform, const char *warningMessage)
+{
+    gl::Trace(gl::LOG_WARN, warningMessage);
+}
+
+void Display_logInfo(angle::PlatformMethods *platform, const char *infoMessage)
+{
+    // Uncomment to get info spam
+#if defined(ANGLE_ENABLE_DEBUG_TRACE)
+    gl::Trace(gl::LOG_INFO, infoMessage);
+#endif
+}
+
+const std::vector<std::string> EGLStringArrayToStringVector(const char **ary)
+{
+    std::vector<std::string> vec;
+    if (ary != nullptr)
+    {
+        for (; *ary != nullptr; ary++)
+        {
+            vec.push_back(std::string(*ary));
+        }
+    }
+    return vec;
+}
+
+void ANGLESetDefaultDisplayPlatform(angle::EGLDisplayType display)
+{
+    angle::PlatformMethods *platformMethods = ANGLEPlatformCurrent();
+
+    ANGLEResetDisplayPlatform(display);
+    platformMethods->logError   = Display_logError;
+    platformMethods->logWarning = Display_logWarning;
+    platformMethods->logInfo    = Display_logInfo;
+}
+
+void UpdateAttribsFromEnvironment(AttributeMap &attribMap)
+{
+    EGLAttrib displayType =
+        attribMap.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE);
+    if (displayType == EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE)
+    {
+        displayType = GetDisplayTypeFromEnvironment();
+        attribMap.insert(EGL_PLATFORM_ANGLE_TYPE_ANGLE, displayType);
+    }
+    EGLAttrib deviceType = attribMap.get(EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE, 0);
+    if (deviceType == 0)
+    {
+        deviceType = GetDeviceTypeFromEnvironment();
+        attribMap.insert(EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE, deviceType);
+    }
+    EGLAttrib platformType = attribMap.get(EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE, 0);
+    if (platformType == 0)
+    {
+        platformType = GetPlatformTypeFromEnvironment();
+        attribMap.insert(EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE, platformType);
+    }
+}
+
+static constexpr uint32_t kScratchBufferLifetime = 64u;
+
+}  // anonymous namespace
+
+// ShareGroup
+ShareGroup::ShareGroup(rx::EGLImplFactory *factory)
+    : mRefCount(1),
+      mImplementation(factory->createShareGroup()),
+      mFrameCaptureShared(new angle::FrameCaptureShared)
+{}
+
+void ShareGroup::finishAllContexts()
+{
+    for (gl::Context *shareContext : mContexts)
+    {
+        if (shareContext->hasBeenCurrent() && !shareContext->isDestroyed())
+        {
+            shareContext->finish();
+        }
+    }
+}
+
+void ShareGroup::addSharedContext(gl::Context *context)
+{
+    mContexts.insert(context);
+
+    if (context->isRobustnessEnabled())
+    {
+        mImplementation->onRobustContextAdd();
+    }
+}
+
+void ShareGroup::removeSharedContext(gl::Context *context)
+{
+    mContexts.erase(context);
+}
+
+ShareGroup::~ShareGroup()
+{
+    SafeDelete(mImplementation);
+}
+
+void ShareGroup::addRef()
+{
+    // This is protected by global lock, so no atomic is required
+    mRefCount++;
+}
+
+void ShareGroup::release(const Display *display)
+{
+    if (--mRefCount == 0)
+    {
+        if (mImplementation)
+        {
+            mImplementation->onDestroy(display);
+        }
+        delete this;
+    }
+}
+
+// DisplayState
+DisplayState::DisplayState(EGLNativeDisplayType nativeDisplayId)
+    : label(nullptr), featuresAllDisabled(false), displayId(nativeDisplayId)
+{}
+
+DisplayState::~DisplayState() {}
+
+// Note that ANGLE support on Ozone platform is limited. Our preferred support Matrix for
+// EGL_ANGLE_platform_angle on Linux and Ozone/Linux/Fuchsia platforms should be the following:
+//
+// |--------------------------------------------------------|
+// | ANGLE type | DEVICE type |  PLATFORM type   | Display  |
+// |--------------------------------------------------------|
+// |   OPENGL   |     EGL     |       ANY        |   EGL    |
+// |   OPENGL   |   HARDWARE  |     X11_EXT      |   GLX    |
+// |  OPENGLES  |   HARDWARE  |     X11_EXT      |   GLX    |
+// |  OPENGLES  |     EGL     |       ANY        |   EGL    |
+// |   VULKAN   |   HARDWARE  |     X11_EXT      |  VkXcb   |
+// |   VULKAN   | SWIFTSHADER |     X11_EXT      |  VkXcb   |
+// |  OPENGLES  |   HARDWARE  | SURFACELESS_MESA |   EGL*   |
+// |  OPENGLES  |   HARDWARE  |    DEVICE_EXT    |   EGL    |
+// |   VULKAN   |   HARDWARE  | SURFACELESS_MESA | VkBase** |
+// |   VULKAN   | SWIFTSHADER | SURFACELESS_MESA | VkBase** |
+// |--------------------------------------------------------|
+//
+// * No surfaceless support yet.
+// ** Not implemented yet.
+//
+// |-----------------------------------------------|
+// |   OS    | BUILD type |  Default PLATFORM type |
+// |-----------------------------------------------|
+// |  Linux  |    X11     |        X11_EXT         |
+// |  Linux  |   Ozone    |    SURFACELESS_MESA    |
+// | Fuchsia |   Ozone    |        FUCHSIA***      |
+// |-----------------------------------------------|
+//
+// *** Chosen implicitly. No EGLAttrib available.
+//
+// For more details, please refer to
+// https://docs.google.com/document/d/1XjHiDZQISq1AMrg_l1TX1_kIKvDpU76hidn9i4cAjl8/edit?disco=AAAAJl9V_YY
+//
+// static
+Display *Display::GetDisplayFromNativeDisplay(EGLenum platform,
+                                              EGLNativeDisplayType nativeDisplay,
+                                              const AttributeMap &attribMap)
+{
+    Display *display = nullptr;
+
+    AttributeMap updatedAttribMap(attribMap);
+    UpdateAttribsFromEnvironment(updatedAttribMap);
+
+    EGLAttrib powerPreference =
+        updatedAttribMap.get(EGL_POWER_PREFERENCE_ANGLE, EGL_LOW_POWER_ANGLE);
+    EGLAttrib platformANGLEType =
+        updatedAttribMap.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE);
+    EGLAttrib deviceIdHigh = updatedAttribMap.get(EGL_PLATFORM_ANGLE_DEVICE_ID_HIGH_ANGLE, 0);
+    EGLAttrib deviceIdLow  = updatedAttribMap.get(EGL_PLATFORM_ANGLE_DEVICE_ID_LOW_ANGLE, 0);
+    ANGLEPlatformDisplayMap *displays = GetANGLEPlatformDisplayMap();
+    ANGLEPlatformDisplay displayKey(nativeDisplay, powerPreference, platformANGLEType, deviceIdHigh,
+                                    deviceIdLow);
+    const auto &iter = displays->find(displayKey);
+    if (iter != displays->end())
+    {
+        display = iter->second;
+    }
+
+    if (display == nullptr)
+    {
+        // Validate the native display
+        if (!Display::isValidNativeDisplay(nativeDisplay))
+        {
+            return nullptr;
+        }
+
+        display = new Display(platform, nativeDisplay, nullptr);
+        displays->insert(std::make_pair(displayKey, display));
+    }
+    // Apply new attributes if the display is not initialized yet.
+    if (!display->isInitialized())
+    {
+        display->setAttributes(updatedAttribMap);
+
+        EGLAttrib displayType  = display->mAttributeMap.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE);
+        EGLAttrib deviceType   = display->mAttributeMap.get(EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE);
+        EGLAttrib platformType = platform;
+        if (platform == EGL_PLATFORM_ANGLE_ANGLE)
+        {
+            platformType =
+                display->mAttributeMap.get(EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE);
+        }
+        rx::DisplayImpl *impl =
+            CreateDisplayFromAttribs(displayType, deviceType, platformType, display->getState());
+        if (impl == nullptr)
+        {
+            // No valid display implementation for these attributes
+            return nullptr;
+        }
+
+#if defined(ANGLE_USE_ANDROID_TLS_SLOT)
+        angle::gUseAndroidOpenGLTlsSlot = displayType == EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE;
+#endif  // defined(ANGLE_PLATFORM_ANDROID)
+
+        display->setupDisplayPlatform(impl);
+    }
+
+    return display;
+}
+
+// static
+Display *Display::GetExistingDisplayFromNativeDisplay(EGLNativeDisplayType nativeDisplay)
+{
+    ANGLEPlatformDisplayMap *displays = GetANGLEPlatformDisplayMap();
+    const auto &iter                  = displays->find(nativeDisplay);
+
+    // Check that there is a matching display
+    if (iter == displays->end())
+    {
+        return nullptr;
+    }
+
+    return iter->second;
+}
+
+// static
+Display *Display::GetDisplayFromDevice(Device *device, const AttributeMap &attribMap)
+{
+    Display *display = nullptr;
+
+    ASSERT(Device::IsValidDevice(device));
+
+    ANGLEPlatformDisplayMap *anglePlatformDisplays   = GetANGLEPlatformDisplayMap();
+    DevicePlatformDisplayMap *devicePlatformDisplays = GetDevicePlatformDisplayMap();
+
+    // First see if this eglDevice is in use by a Display created using ANGLE platform
+    for (auto &displayMapEntry : *anglePlatformDisplays)
+    {
+        egl::Display *iterDisplay = displayMapEntry.second;
+        if (iterDisplay->getDevice() == device)
+        {
+            display = iterDisplay;
+        }
+    }
+
+    if (display == nullptr)
+    {
+        // See if the eglDevice is in use by a Display created using the DEVICE platform
+        const auto &iter = devicePlatformDisplays->find(device);
+        if (iter != devicePlatformDisplays->end())
+        {
+            display = iter->second;
+        }
+    }
+
+    if (display == nullptr)
+    {
+        // Otherwise create a new Display
+        display = new Display(EGL_PLATFORM_DEVICE_EXT, 0, device);
+        devicePlatformDisplays->insert(std::make_pair(device, display));
+    }
+
+    // Apply new attributes if the display is not initialized yet.
+    if (!display->isInitialized())
+    {
+        display->setAttributes(attribMap);
+        rx::DisplayImpl *impl = CreateDisplayFromDevice(device, display->getState());
+        display->setupDisplayPlatform(impl);
+    }
+
+    return display;
+}
+
+// static
+Display::EglDisplaySet Display::GetEglDisplaySet()
+{
+    Display::EglDisplaySet displays;
+
+    ANGLEPlatformDisplayMap *anglePlatformDisplays   = GetANGLEPlatformDisplayMap();
+    DevicePlatformDisplayMap *devicePlatformDisplays = GetDevicePlatformDisplayMap();
+
+    for (auto anglePlatformDisplayMapEntry : *anglePlatformDisplays)
+    {
+        displays.insert(anglePlatformDisplayMapEntry.second);
+    }
+
+    for (auto devicePlatformDisplayMapEntry : *devicePlatformDisplays)
+    {
+        displays.insert(devicePlatformDisplayMapEntry.second);
+    }
+
+    return displays;
+}
+
+Display::Display(EGLenum platform, EGLNativeDisplayType displayId, Device *eglDevice)
+    : mState(displayId),
+      mImplementation(nullptr),
+      mGPUSwitchedBinding(this, kGPUSwitchedSubjectIndex),
+      mAttributeMap(),
+      mConfigSet(),
+      mStreamSet(),
+      mInvalidContextSet(),
+      mInvalidImageSet(),
+      mInvalidStreamSet(),
+      mInvalidSurfaceSet(),
+      mInvalidSyncSet(),
+      mInitialized(false),
+      mDeviceLost(false),
+      mCaps(),
+      mDisplayExtensions(),
+      mDisplayExtensionString(),
+      mVendorString(),
+      mVersionString(),
+      mDevice(eglDevice),
+      mSurface(nullptr),
+      mPlatform(platform),
+      mTextureManager(nullptr),
+      mSemaphoreManager(nullptr),
+      mBlobCache(gl::kDefaultMaxProgramCacheMemoryBytes),
+      mMemoryProgramCache(mBlobCache),
+      mMemoryShaderCache(mBlobCache),
+      mGlobalTextureShareGroupUsers(0),
+      mGlobalSemaphoreShareGroupUsers(0),
+      mTerminatedByApi(false),
+      mActiveThreads()
+{}
+
+Display::~Display()
+{
+    switch (mPlatform)
+    {
+        case EGL_PLATFORM_ANGLE_ANGLE:
+        case EGL_PLATFORM_GBM_KHR:
+        case EGL_PLATFORM_WAYLAND_EXT:
+        {
+            ANGLEPlatformDisplayMap *displays      = GetANGLEPlatformDisplayMap();
+            ANGLEPlatformDisplayMap::iterator iter = displays->find(ANGLEPlatformDisplay(
+                mState.displayId,
+                mAttributeMap.get(EGL_POWER_PREFERENCE_ANGLE, EGL_LOW_POWER_ANGLE),
+                mAttributeMap.get(EGL_PLATFORM_ANGLE_TYPE_ANGLE,
+                                  EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE),
+                mAttributeMap.get(EGL_PLATFORM_ANGLE_DEVICE_ID_HIGH_ANGLE, 0),
+                mAttributeMap.get(EGL_PLATFORM_ANGLE_DEVICE_ID_LOW_ANGLE, 0)));
+            if (iter != displays->end())
+            {
+                displays->erase(iter);
+            }
+            break;
+        }
+        case EGL_PLATFORM_DEVICE_EXT:
+        {
+            DevicePlatformDisplayMap *displays      = GetDevicePlatformDisplayMap();
+            DevicePlatformDisplayMap::iterator iter = displays->find(mDevice);
+            if (iter != displays->end())
+            {
+                displays->erase(iter);
+            }
+            break;
+        }
+        default:
+        {
+            UNREACHABLE();
+        }
+    }
+
+    SafeDelete(mDevice);
+    SafeDelete(mImplementation);
+}
+
+void Display::setLabel(EGLLabelKHR label)
+{
+    mState.label = label;
+}
+
+EGLLabelKHR Display::getLabel() const
+{
+    return mState.label;
+}
+
+void Display::onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message)
+{
+    ASSERT(index == kGPUSwitchedSubjectIndex);
+    ASSERT(message == angle::SubjectMessage::SubjectChanged);
+    for (gl::Context *context : mState.contextSet)
+    {
+        context->onGPUSwitch();
+    }
+}
+
+void Display::setupDisplayPlatform(rx::DisplayImpl *impl)
+{
+    ASSERT(!mInitialized);
+
+    ASSERT(impl != nullptr);
+    SafeDelete(mImplementation);
+    mImplementation = impl;
+
+    // TODO(anglebug.com/7365): Remove PlatformMethods.
+    const angle::PlatformMethods *platformMethods =
+        reinterpret_cast<const angle::PlatformMethods *>(
+            mAttributeMap.get(EGL_PLATFORM_ANGLE_PLATFORM_METHODS_ANGLEX, 0));
+    if (platformMethods != nullptr)
+    {
+        *ANGLEPlatformCurrent() = *platformMethods;
+    }
+    else
+    {
+        ANGLESetDefaultDisplayPlatform(this);
+    }
+
+    const char **featuresForceEnabled =
+        reinterpret_cast<const char **>(mAttributeMap.get(EGL_FEATURE_OVERRIDES_ENABLED_ANGLE, 0));
+    const char **featuresForceDisabled =
+        reinterpret_cast<const char **>(mAttributeMap.get(EGL_FEATURE_OVERRIDES_DISABLED_ANGLE, 0));
+    mState.featureOverridesEnabled  = EGLStringArrayToStringVector(featuresForceEnabled);
+    mState.featureOverridesDisabled = EGLStringArrayToStringVector(featuresForceDisabled);
+    mState.featuresAllDisabled =
+        static_cast<bool>(mAttributeMap.get(EGL_FEATURE_ALL_DISABLED_ANGLE, 0));
+    mImplementation->addObserver(&mGPUSwitchedBinding);
+}
+
+Error Display::initialize()
+{
+    mTerminatedByApi = false;
+
+    ASSERT(mImplementation != nullptr);
+    mImplementation->setBlobCache(&mBlobCache);
+
+    // Enable shader caching if debug layers are turned on. This allows us to test that shaders are
+    // properly saved & restored on all platforms. The cache won't allocate space until it's used
+    // and will be ignored entirely if the application / system sets it's own cache functions.
+    if (rx::ShouldUseDebugLayers(mAttributeMap))
+    {
+        mBlobCache.resize(1024 * 1024);
+    }
+
+    setGlobalDebugAnnotator();
+
+    gl::InitializeDebugMutexIfNeeded();
+
+    ANGLE_TRACE_EVENT0("gpu.angle", "egl::Display::initialize");
+
+    if (isInitialized())
+    {
+        return NoError();
+    }
+
+    Error error = mImplementation->initialize(this);
+    if (error.isError())
+    {
+        // Log extended error message here
+        ERR() << "ANGLE Display::initialize error " << error.getID() << ": " << error.getMessage();
+        return error;
+    }
+
+    mCaps = mImplementation->getCaps();
+
+    mConfigSet = mImplementation->generateConfigs();
+    if (mConfigSet.size() == 0)
+    {
+        mImplementation->terminate();
+        return EglNotInitialized() << "No configs were generated.";
+    }
+
+    // OpenGL ES1 is implemented in the frontend, explicitly add ES1 support to all configs
+    for (auto &config : mConfigSet)
+    {
+        // TODO(geofflang): Enable the conformant bit once we pass enough tests
+        // config.second.conformant |= EGL_OPENGL_ES_BIT;
+
+        config.second.renderableType |= EGL_OPENGL_ES_BIT;
+
+        // If we aren't using desktop GL entry points, remove desktop GL support from all configs
+#if !defined(ANGLE_ENABLE_GL_DESKTOP_FRONTEND)
+        config.second.renderableType &= ~EGL_OPENGL_BIT;
+#endif
+    }
+
+    if (!mState.featuresAllDisabled)
+    {
+        initializeFrontendFeatures();
+    }
+
+    mFeatures.clear();
+    mFrontendFeatures.populateFeatureList(&mFeatures);
+    mImplementation->populateFeatureList(&mFeatures);
+
+    initDisplayExtensions();
+    initVendorString();
+    initVersionString();
+    initClientAPIString();
+
+    // Populate the Display's EGLDeviceEXT if the Display wasn't created using one
+    if (mPlatform == EGL_PLATFORM_DEVICE_EXT)
+    {
+        // For EGL_PLATFORM_DEVICE_EXT, mDevice should always be populated using
+        // an external device
+        ASSERT(mDevice != nullptr);
+    }
+    else if (GetClientExtensions().deviceQueryEXT)
+    {
+        std::unique_ptr<rx::DeviceImpl> impl(mImplementation->createDevice());
+        ASSERT(impl);
+        error = impl->initialize();
+        if (error.isError())
+        {
+            ERR() << "Failed to initialize display because device creation failed: "
+                  << error.getMessage();
+            mImplementation->terminate();
+            return error;
+        }
+        // Don't leak Device memory.
+        ASSERT(mDevice == nullptr);
+        mDevice = new Device(this, impl.release());
+    }
+    else
+    {
+        mDevice = nullptr;
+    }
+
+    mInitialized = true;
+
+    return NoError();
+}
+
+Error Display::destroyInvalidEglObjects()
+{
+    // Destroy invalid EGL objects
+    while (!mInvalidContextSet.empty())
+    {
+        gl::Context *context = *mInvalidContextSet.begin();
+        context->setIsDestroyed();
+        ANGLE_TRY(releaseContextImpl(context, &mInvalidContextSet));
+    }
+
+    while (!mInvalidImageSet.empty())
+    {
+        destroyImageImpl(*mInvalidImageSet.begin(), &mInvalidImageSet);
+    }
+
+    while (!mInvalidStreamSet.empty())
+    {
+        destroyStreamImpl(*mInvalidStreamSet.begin(), &mInvalidStreamSet);
+    }
+
+    while (!mInvalidSurfaceSet.empty())
+    {
+        ANGLE_TRY(destroySurfaceImpl(*mInvalidSurfaceSet.begin(), &mInvalidSurfaceSet));
+    }
+
+    while (!mInvalidSyncSet.empty())
+    {
+        destroySyncImpl(*mInvalidSyncSet.begin(), &mInvalidSyncSet);
+    }
+
+    return NoError();
+}
+
+Error Display::terminate(Thread *thread, TerminateReason terminateReason)
+{
+    if (terminateReason == TerminateReason::Api)
+    {
+        mTerminatedByApi = true;
+    }
+
+    // All subsequent calls assume the display to be valid and terminated by app.
+    // If it is not terminated or if it isn't even initialized, early return.
+    if (!mTerminatedByApi || !mInitialized)
+    {
+        return NoError();
+    }
+
+    // EGL 1.5 Specification
+    // 3.2 Initialization
+    // Termination marks all EGL-specific resources, such as contexts and surfaces, associated
+    // with the specified display for deletion. Handles to all such resources are invalid as soon
+    // as eglTerminate returns. Cache EGL objects that are no longer valid.
+    //
+    // It is fairly common for apps to call eglTerminate while some contexts and/or surfaces are
+    // still current on some thread. Since objects are refCounted, trying to destroy them right away
+    // would only result in a decRef. We instead cache such invalid objects and use other EGL
+    // entrypoints like eglReleaseThread or thread exit events (on the Android platform) to
+    // perform the necessary cleanup.
+    mInvalidImageSet.insert(mImageSet.begin(), mImageSet.end());
+    mImageSet.clear();
+
+    mInvalidStreamSet.insert(mStreamSet.begin(), mStreamSet.end());
+    mStreamSet.clear();
+
+    mInvalidSurfaceSet.insert(mState.surfaceSet.begin(), mState.surfaceSet.end());
+    mState.surfaceSet.clear();
+
+    mInvalidSyncSet.insert(mSyncSet.begin(), mSyncSet.end());
+    mSyncSet.clear();
+
+    // Cache total number of contexts before invalidation. This is used as a check to verify that
+    // no context is "lost" while being moved between the various sets.
+    size_t contextSetSizeBeforeInvalidation = mState.contextSet.size() + mInvalidContextSet.size();
+
+    // If app called eglTerminate and no active threads remain,
+    // force realease any context that is still current.
+    ContextSet contextsStillCurrent = {};
+    for (gl::Context *context : mState.contextSet)
+    {
+        if (context->getRefCount() > 0)
+        {
+            if (terminateReason == TerminateReason::NoActiveThreads)
+            {
+                ASSERT(mTerminatedByApi);
+                context->release();
+                (void)context->unMakeCurrent(this);
+            }
+            else
+            {
+                contextsStillCurrent.emplace(context);
+                continue;
+            }
+        }
+
+        // Add context that is not current to mInvalidContextSet for cleanup.
+        mInvalidContextSet.emplace(context);
+    }
+
+    // There are many methods that require contexts that are still current to be present in
+    // display's contextSet like during context release or to notify of state changes in a subject.
+    // So as to not interrupt this flow, do not remove contexts that are still current on some
+    // thread from display's contextSet even though eglTerminate marks such contexts as invalid.
+    //
+    // "mState.contextSet" will now contain only those contexts that are still current on some
+    // thread.
+    mState.contextSet = std::move(contextsStillCurrent);
+
+    // Assert that the total number of contexts is the same before and after context invalidation.
+    ASSERT(contextSetSizeBeforeInvalidation ==
+           mState.contextSet.size() + mInvalidContextSet.size());
+
+    if (!mState.contextSet.empty())
+    {
+        // There was atleast 1 context that was current on some thread, early return.
+        return NoError();
+    }
+
+    mMemoryProgramCache.clear();
+    mMemoryShaderCache.clear();
+    mBlobCache.setBlobCacheFuncs(nullptr, nullptr);
+
+    // The global texture and semaphore managers should be deleted with the last context that uses
+    // it.
+    ASSERT(mGlobalTextureShareGroupUsers == 0 && mTextureManager == nullptr);
+    ASSERT(mGlobalSemaphoreShareGroupUsers == 0 && mSemaphoreManager == nullptr);
+
+    // Clean up all invalid objects
+    ANGLE_TRY(destroyInvalidEglObjects());
+
+    mConfigSet.clear();
+
+    if (mDevice != nullptr && mDevice->getOwningDisplay() != nullptr)
+    {
+        // Don't delete the device if it was created externally using eglCreateDeviceANGLE
+        // We also shouldn't set it to null in case eglInitialize() is called again later
+        SafeDelete(mDevice);
+    }
+
+    mImplementation->terminate();
+
+    mDeviceLost = false;
+
+    mInitialized = false;
+
+    gl::UninitializeDebugAnnotations();
+
+    // TODO(jmadill): Store Platform in Display and deinit here.
+    ANGLEResetDisplayPlatform(this);
+
+    return NoError();
+}
+
+Error Display::prepareForCall()
+{
+    return mImplementation->prepareForCall();
+}
+
+Error Display::releaseThread()
+{
+    ANGLE_TRY(mImplementation->releaseThread());
+    return destroyInvalidEglObjects();
+}
+
+void Display::addActiveThread(Thread *thread)
+{
+    mActiveThreads.insert(thread);
+}
+
+void Display::threadCleanup(Thread *thread)
+{
+    mActiveThreads.erase(thread);
+    const bool noActiveThreads = mActiveThreads.size() == 0;
+
+    (void)terminate(thread, noActiveThreads ? TerminateReason::NoActiveThreads
+                                            : TerminateReason::InternalCleanup);
+}
+
+std::vector<const Config *> Display::getConfigs(const egl::AttributeMap &attribs) const
+{
+    return mConfigSet.filter(attribs);
+}
+
+std::vector<const Config *> Display::chooseConfig(const egl::AttributeMap &attribs) const
+{
+    egl::AttributeMap attribsWithDefaults = AttributeMap();
+
+    // Insert default values for attributes that have either an Exact or Mask selection criteria,
+    // and a default value that matters (e.g. isn't EGL_DONT_CARE):
+    attribsWithDefaults.insert(EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER);
+    attribsWithDefaults.insert(EGL_LEVEL, 0);
+    attribsWithDefaults.insert(EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT);
+    attribsWithDefaults.insert(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
+    attribsWithDefaults.insert(EGL_TRANSPARENT_TYPE, EGL_NONE);
+    if (getExtensions().pixelFormatFloat)
+    {
+        attribsWithDefaults.insert(EGL_COLOR_COMPONENT_TYPE_EXT,
+                                   EGL_COLOR_COMPONENT_TYPE_FIXED_EXT);
+    }
+
+    // Add the caller-specified values (Note: the poorly-named insert() method will replace any
+    // of the default values from above):
+    for (auto attribIter = attribs.begin(); attribIter != attribs.end(); attribIter++)
+    {
+        attribsWithDefaults.insert(attribIter->first, attribIter->second);
+    }
+
+    return mConfigSet.filter(attribsWithDefaults);
+}
+
+Error Display::createWindowSurface(const Config *configuration,
+                                   EGLNativeWindowType window,
+                                   const AttributeMap &attribs,
+                                   Surface **outSurface)
+{
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    SurfacePointer surface(new WindowSurface(mImplementation, configuration, window, attribs,
+                                             mFrontendFeatures.forceRobustResourceInit.enabled),
+                           this);
+    ANGLE_TRY(surface->initialize(this));
+
+    ASSERT(outSurface != nullptr);
+    *outSurface = surface.release();
+    mState.surfaceSet.insert(*outSurface);
+
+    WindowSurfaceMap *windowSurfaces = GetWindowSurfaces();
+    ASSERT(windowSurfaces && windowSurfaces->find(window) == windowSurfaces->end());
+    windowSurfaces->insert(std::make_pair(window, *outSurface));
+
+    mSurface = *outSurface;
+
+    return NoError();
+}
+
+Error Display::createPbufferSurface(const Config *configuration,
+                                    const AttributeMap &attribs,
+                                    Surface **outSurface)
+{
+    ASSERT(isInitialized());
+
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    SurfacePointer surface(new PbufferSurface(mImplementation, configuration, attribs,
+                                              mFrontendFeatures.forceRobustResourceInit.enabled),
+                           this);
+    ANGLE_TRY(surface->initialize(this));
+
+    ASSERT(outSurface != nullptr);
+    *outSurface = surface.release();
+    mState.surfaceSet.insert(*outSurface);
+
+    return NoError();
+}
+
+Error Display::createPbufferFromClientBuffer(const Config *configuration,
+                                             EGLenum buftype,
+                                             EGLClientBuffer clientBuffer,
+                                             const AttributeMap &attribs,
+                                             Surface **outSurface)
+{
+    ASSERT(isInitialized());
+
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    SurfacePointer surface(
+        new PbufferSurface(mImplementation, configuration, buftype, clientBuffer, attribs,
+                           mFrontendFeatures.forceRobustResourceInit.enabled),
+        this);
+    ANGLE_TRY(surface->initialize(this));
+
+    ASSERT(outSurface != nullptr);
+    *outSurface = surface.release();
+    mState.surfaceSet.insert(*outSurface);
+
+    return NoError();
+}
+
+Error Display::createPixmapSurface(const Config *configuration,
+                                   NativePixmapType nativePixmap,
+                                   const AttributeMap &attribs,
+                                   Surface **outSurface)
+{
+    ASSERT(isInitialized());
+
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    SurfacePointer surface(new PixmapSurface(mImplementation, configuration, nativePixmap, attribs,
+                                             mFrontendFeatures.forceRobustResourceInit.enabled),
+                           this);
+    ANGLE_TRY(surface->initialize(this));
+
+    ASSERT(outSurface != nullptr);
+    *outSurface = surface.release();
+    mState.surfaceSet.insert(*outSurface);
+
+    return NoError();
+}
+
+Error Display::createImage(const gl::Context *context,
+                           EGLenum target,
+                           EGLClientBuffer buffer,
+                           const AttributeMap &attribs,
+                           Image **outImage)
+{
+    ASSERT(isInitialized());
+
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    egl::ImageSibling *sibling = nullptr;
+    if (IsTextureTarget(target))
+    {
+        sibling = context->getTexture({egl_gl::EGLClientBufferToGLObjectHandle(buffer)});
+    }
+    else if (IsRenderbufferTarget(target))
+    {
+        sibling = context->getRenderbuffer({egl_gl::EGLClientBufferToGLObjectHandle(buffer)});
+    }
+    else if (IsExternalImageTarget(target))
+    {
+        sibling = new ExternalImageSibling(mImplementation, context, target, buffer, attribs);
+    }
+    else
+    {
+        UNREACHABLE();
+    }
+    ASSERT(sibling != nullptr);
+
+    angle::UniqueObjectPointer<Image, Display> imagePtr(
+        new Image(mImplementation, context, target, sibling, attribs), this);
+    ANGLE_TRY(imagePtr->initialize(this));
+
+    Image *image = imagePtr.release();
+
+    ASSERT(outImage != nullptr);
+    *outImage = image;
+
+    // Add this image to the list of all images and hold a ref to it.
+    image->addRef();
+    mImageSet.insert(image);
+
+    return NoError();
+}
+
+Error Display::createStream(const AttributeMap &attribs, Stream **outStream)
+{
+    ASSERT(isInitialized());
+
+    Stream *stream = new Stream(this, attribs);
+
+    ASSERT(stream != nullptr);
+    mStreamSet.insert(stream);
+
+    ASSERT(outStream != nullptr);
+    *outStream = stream;
+
+    return NoError();
+}
+
+Error Display::createContext(const Config *configuration,
+                             gl::Context *shareContext,
+                             EGLenum clientType,
+                             const AttributeMap &attribs,
+                             gl::Context **outContext)
+{
+    ASSERT(!mTerminatedByApi);
+    ASSERT(isInitialized());
+
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    // This display texture sharing will allow the first context to create the texture share group.
+    bool usingDisplayTextureShareGroup =
+        attribs.get(EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE, EGL_FALSE) == EGL_TRUE;
+    gl::TextureManager *shareTextures = nullptr;
+
+    if (usingDisplayTextureShareGroup)
+    {
+        ASSERT((mTextureManager == nullptr) == (mGlobalTextureShareGroupUsers == 0));
+        if (mTextureManager == nullptr)
+        {
+            mTextureManager = new gl::TextureManager();
+        }
+
+        mGlobalTextureShareGroupUsers++;
+        shareTextures = mTextureManager;
+    }
+
+    // This display semaphore sharing will allow the first context to create the semaphore share
+    // group.
+    bool usingDisplaySemaphoreShareGroup =
+        attribs.get(EGL_DISPLAY_SEMAPHORE_SHARE_GROUP_ANGLE, EGL_FALSE) == EGL_TRUE;
+    gl::SemaphoreManager *shareSemaphores = nullptr;
+    if (usingDisplaySemaphoreShareGroup)
+    {
+        ASSERT((mSemaphoreManager == nullptr) == (mGlobalSemaphoreShareGroupUsers == 0));
+        if (mSemaphoreManager == nullptr)
+        {
+            mSemaphoreManager = new gl::SemaphoreManager();
+        }
+
+        mGlobalSemaphoreShareGroupUsers++;
+        shareSemaphores = mSemaphoreManager;
+    }
+
+    gl::MemoryProgramCache *programCachePointer = &mMemoryProgramCache;
+    // Check context creation attributes to see if we are using EGL_ANGLE_program_cache_control.
+    // If not, keep caching enabled for EGL_ANDROID_blob_cache, which can have its callbacks set
+    // at any time.
+    bool usesProgramCacheControl = attribs.contains(EGL_CONTEXT_PROGRAM_BINARY_CACHE_ENABLED_ANGLE);
+    if (usesProgramCacheControl)
+    {
+        bool programCacheControlEnabled =
+            (attribs.get(EGL_CONTEXT_PROGRAM_BINARY_CACHE_ENABLED_ANGLE, GL_FALSE) == GL_TRUE);
+        // A program cache size of zero indicates it should be disabled.
+        if (!programCacheControlEnabled || mMemoryProgramCache.maxSize() == 0)
+        {
+            programCachePointer = nullptr;
+        }
+    }
+
+    gl::MemoryShaderCache *shaderCachePointer = &mMemoryShaderCache;
+    // Check if shader caching frontend feature is enabled.
+    if (!mFrontendFeatures.cacheCompiledShader.enabled)
+    {
+        shaderCachePointer = nullptr;
+    }
+
+    gl::Context *context = new gl::Context(
+        this, configuration, shareContext, shareTextures, shareSemaphores, programCachePointer,
+        shaderCachePointer, clientType, attribs, mDisplayExtensions, GetClientExtensions());
+    Error error = context->initialize();
+    if (error.isError())
+    {
+        delete context;
+        return error;
+    }
+
+    if (shareContext != nullptr)
+    {
+        shareContext->setShared();
+    }
+
+    ASSERT(context != nullptr);
+    mState.contextSet.insert(context);
+
+    ASSERT(outContext != nullptr);
+    *outContext = context;
+    return NoError();
+}
+
+Error Display::createSync(const gl::Context *currentContext,
+                          EGLenum type,
+                          const AttributeMap &attribs,
+                          Sync **outSync)
+{
+    ASSERT(isInitialized());
+
+    if (mImplementation->testDeviceLost())
+    {
+        ANGLE_TRY(restoreLostDevice());
+    }
+
+    angle::UniqueObjectPointer<egl::Sync, Display> syncPtr(new Sync(mImplementation, type, attribs),
+                                                           this);
+
+    ANGLE_TRY(syncPtr->initialize(this, currentContext));
+
+    Sync *sync = syncPtr.release();
+
+    sync->addRef();
+    mSyncSet.insert(sync);
+
+    *outSync = sync;
+    return NoError();
+}
+
+Error Display::makeCurrent(Thread *thread,
+                           gl::Context *previousContext,
+                           egl::Surface *drawSurface,
+                           egl::Surface *readSurface,
+                           gl::Context *context)
+{
+    if (!mInitialized)
+    {
+        return NoError();
+    }
+
+    bool contextChanged = context != previousContext;
+    if (previousContext != nullptr && contextChanged)
+    {
+        previousContext->release();
+        thread->setCurrent(nullptr);
+
+        auto error = previousContext->unMakeCurrent(this);
+        if (previousContext->getRefCount() == 0 && previousContext->isDestroyed())
+        {
+            // The previous Context may have been created with a different Display.
+            Display *previousDisplay = previousContext->getDisplay();
+            ANGLE_TRY(previousDisplay->releaseContext(previousContext, thread));
+        }
+        ANGLE_TRY(error);
+    }
+
+    thread->setCurrent(context);
+
+    ANGLE_TRY(mImplementation->makeCurrent(this, drawSurface, readSurface, context));
+
+    if (context != nullptr)
+    {
+        ANGLE_TRY(context->makeCurrent(this, drawSurface, readSurface));
+        if (contextChanged)
+        {
+            context->addRef();
+        }
+    }
+
+    // Tick all the scratch buffers to make sure they get cleaned up eventually if they stop being
+    // used.
+    {
+        std::lock_guard<std::mutex> lock(mScratchBufferMutex);
+
+        for (angle::ScratchBuffer &scatchBuffer : mScratchBuffers)
+        {
+            scatchBuffer.tick();
+        }
+        for (angle::ScratchBuffer &zeroFilledBuffer : mZeroFilledBuffers)
+        {
+            zeroFilledBuffer.tick();
+        }
+    }
+
+    return NoError();
+}
+
+Error Display::restoreLostDevice()
+{
+    for (ContextSet::iterator ctx = mState.contextSet.begin(); ctx != mState.contextSet.end();
+         ctx++)
+    {
+        if ((*ctx)->isResetNotificationEnabled())
+        {
+            // If reset notifications have been requested, application must delete all contexts
+            // first
+            return EglContextLost();
+        }
+    }
+
+    return mImplementation->restoreLostDevice(this);
+}
+
+Error Display::destroySurfaceImpl(Surface *surface, SurfaceSet *surfaces)
+{
+    if (surface->getType() == EGL_WINDOW_BIT)
+    {
+        WindowSurfaceMap *windowSurfaces = GetWindowSurfaces();
+        ASSERT(windowSurfaces);
+
+        bool surfaceRemoved = false;
+        for (WindowSurfaceMap::iterator iter = windowSurfaces->begin();
+             iter != windowSurfaces->end(); iter++)
+        {
+            if (iter->second == surface)
+            {
+                windowSurfaces->erase(iter);
+                surfaceRemoved = true;
+                break;
+            }
+        }
+
+        ASSERT(surfaceRemoved);
+    }
+
+    auto iter = surfaces->find(surface);
+    ASSERT(iter != surfaces->end());
+    surfaces->erase(iter);
+    ANGLE_TRY(surface->onDestroy(this));
+    return NoError();
+}
+
+void Display::destroyImageImpl(Image *image, ImageSet *images)
+{
+    auto iter = images->find(image);
+    ASSERT(iter != images->end());
+    (*iter)->release(this);
+    images->erase(iter);
+}
+
+void Display::destroyStreamImpl(Stream *stream, StreamSet *streams)
+{
+    streams->erase(stream);
+    SafeDelete(stream);
+}
+
+// releaseContext must be called with the context being deleted as current.
+// To do that we can only call this in two places, Display::makeCurrent at the point where this
+// context is being made uncurrent and in Display::destroyContext where we make the context current
+// as part of destruction.
+Error Display::releaseContext(gl::Context *context, Thread *thread)
+{
+    return releaseContextImpl(context, &mState.contextSet);
+}
+
+Error Display::releaseContextImpl(gl::Context *context, ContextSet *contexts)
+{
+    ASSERT(context->getRefCount() == 0);
+
+    // Use scoped_ptr to make sure the context is always freed.
+    std::unique_ptr<gl::Context> unique_context(context);
+    ASSERT(contexts->find(context) != contexts->end());
+    contexts->erase(context);
+
+    if (context->usingDisplayTextureShareGroup())
+    {
+        ASSERT(mGlobalTextureShareGroupUsers >= 1 && mTextureManager != nullptr);
+        if (mGlobalTextureShareGroupUsers == 1)
+        {
+            // If this is the last context using the global share group, destroy the global
+            // texture manager so that the textures can be destroyed while a context still
+            // exists
+            mTextureManager->release(context);
+            mTextureManager = nullptr;
+        }
+        mGlobalTextureShareGroupUsers--;
+    }
+
+    if (context->usingDisplaySemaphoreShareGroup())
+    {
+        ASSERT(mGlobalSemaphoreShareGroupUsers >= 1 && mSemaphoreManager != nullptr);
+        if (mGlobalSemaphoreShareGroupUsers == 1)
+        {
+            // If this is the last context using the global share group, destroy the global
+            // semaphore manager so that the semaphores can be destroyed while a context still
+            // exists
+            mSemaphoreManager->release(context);
+            mSemaphoreManager = nullptr;
+        }
+        mGlobalSemaphoreShareGroupUsers--;
+    }
+
+    ANGLE_TRY(context->onDestroy(this));
+
+    return NoError();
+}
+
+Error Display::destroyContext(Thread *thread, gl::Context *context)
+{
+    auto *currentContext     = thread->getContext();
+    auto *currentDrawSurface = thread->getCurrentDrawSurface();
+    auto *currentReadSurface = thread->getCurrentReadSurface();
+
+    context->setIsDestroyed();
+
+    // If the context is still current on at least 1 thread, just return since it'll be released
+    // once no threads have it current anymore.
+    if (context->getRefCount() > 0)
+    {
+        return NoError();
+    }
+
+    // For external context, we cannot change the current native context, and the API user should
+    // make sure the native context is current.
+    if (context->isExternal())
+    {
+        ANGLE_TRY(releaseContext(context, thread));
+    }
+    else
+    {
+        // Keep |currentContext| alive, while releasing |context|.
+        gl::ScopedContextRef scopedContextRef(currentContext);
+
+        // keep |currentDrawSurface| and |currentReadSurface| alive as well
+        // while releasing |context|.
+        ScopedSurfaceRef drawSurfaceRef(currentDrawSurface);
+        ScopedSurfaceRef readSurfaceRef(
+            currentReadSurface == currentDrawSurface ? nullptr : currentReadSurface);
+
+        // Make the context current, so we can release resources belong to the context, and then
+        // when context is released from the current, it will be destroyed.
+        // TODO(http://www.anglebug.com/6322): Don't require a Context to be current in order to
+        // destroy it.
+        ANGLE_TRY(makeCurrent(thread, currentContext, nullptr, nullptr, context));
+        ANGLE_TRY(
+            makeCurrent(thread, context, currentDrawSurface, currentReadSurface, currentContext));
+    }
+
+    // If eglTerminate() has previously been called and this is the last Context the Display owns,
+    // we can now fully terminate the display and release all of its resources.
+    if (mTerminatedByApi)
+    {
+        for (const gl::Context *ctx : mState.contextSet)
+        {
+            if (ctx->getRefCount() > 0)
+            {
+                return NoError();
+            }
+        }
+
+        return terminate(thread, TerminateReason::InternalCleanup);
+    }
+
+    return NoError();
+}
+
+void Display::destroySyncImpl(Sync *sync, SyncSet *syncs)
+{
+    auto iter = syncs->find(sync);
+    ASSERT(iter != syncs->end());
+    (*iter)->release(this);
+    syncs->erase(iter);
+}
+
+void Display::destroyImage(Image *image)
+{
+    return destroyImageImpl(image, &mImageSet);
+}
+
+void Display::destroyStream(Stream *stream)
+{
+    return destroyStreamImpl(stream, &mStreamSet);
+}
+
+Error Display::destroySurface(Surface *surface)
+{
+    return destroySurfaceImpl(surface, &mState.surfaceSet);
+}
+
+void Display::destroySync(Sync *sync)
+{
+    return destroySyncImpl(sync, &mSyncSet);
+}
+
+bool Display::isDeviceLost() const
+{
+    ASSERT(isInitialized());
+    return mDeviceLost;
+}
+
+bool Display::testDeviceLost()
+{
+    ASSERT(isInitialized());
+
+    if (!mDeviceLost && mImplementation->testDeviceLost())
+    {
+        notifyDeviceLost();
+    }
+
+    return mDeviceLost;
+}
+
+void Display::notifyDeviceLost()
+{
+    if (mDeviceLost)
+    {
+        return;
+    }
+
+    for (ContextSet::iterator context = mState.contextSet.begin();
+         context != mState.contextSet.end(); context++)
+    {
+        (*context)->markContextLost(gl::GraphicsResetStatus::UnknownContextReset);
+    }
+
+    mDeviceLost = true;
+}
+
+void Display::setBlobCacheFuncs(EGLSetBlobFuncANDROID set, EGLGetBlobFuncANDROID get)
+{
+    mBlobCache.setBlobCacheFuncs(set, get);
+    mImplementation->setBlobCacheFuncs(set, get);
+}
+
+// static
+EGLClientBuffer Display::GetNativeClientBuffer(const AHardwareBuffer *buffer)
+{
+    return angle::android::AHardwareBufferToClientBuffer(buffer);
+}
+
+// static
+Error Display::CreateNativeClientBuffer(const egl::AttributeMap &attribMap,
+                                        EGLClientBuffer *eglClientBuffer)
+{
+    int androidHardwareBufferFormat = gl::GetAndroidHardwareBufferFormatFromChannelSizes(attribMap);
+    int width                       = attribMap.getAsInt(EGL_WIDTH, 0);
+    int height                      = attribMap.getAsInt(EGL_HEIGHT, 0);
+    int usage                       = attribMap.getAsInt(EGL_NATIVE_BUFFER_USAGE_ANDROID, 0);
+
+    // https://developer.android.com/ndk/reference/group/a-hardware-buffer#ahardwarebuffer_lock
+    // for AHardwareBuffer_lock()
+    // The passed AHardwareBuffer must have one layer, otherwise the call will fail.
+    constexpr int kLayerCount = 1;
+
+    *eglClientBuffer = angle::android::CreateEGLClientBufferFromAHardwareBuffer(
+        width, height, kLayerCount, androidHardwareBufferFormat, usage);
+
+    return (*eglClientBuffer == nullptr)
+               ? egl::EglBadParameter() << "native client buffer allocation failed."
+               : NoError();
+}
+
+Error Display::waitClient(const gl::Context *context)
+{
+    return mImplementation->waitClient(context);
+}
+
+Error Display::waitNative(const gl::Context *context, EGLint engine)
+{
+    return mImplementation->waitNative(context, engine);
+}
+
+const Caps &Display::getCaps() const
+{
+    return mCaps;
+}
+
+bool Display::isInitialized() const
+{
+    return mInitialized;
+}
+
+bool Display::isValidConfig(const Config *config) const
+{
+    return mConfigSet.contains(config);
+}
+
+bool Display::isValidContext(const gl::Context *context) const
+{
+    return mState.contextSet.find(const_cast<gl::Context *>(context)) != mState.contextSet.end();
+}
+
+bool Display::isValidSurface(const Surface *surface) const
+{
+    return mState.surfaceSet.find(const_cast<Surface *>(surface)) != mState.surfaceSet.end();
+}
+
+bool Display::isValidImage(const Image *image) const
+{
+    return mImageSet.find(const_cast<Image *>(image)) != mImageSet.end();
+}
+
+bool Display::isValidStream(const Stream *stream) const
+{
+    return mStreamSet.find(const_cast<Stream *>(stream)) != mStreamSet.end();
+}
+
+bool Display::isValidSync(const Sync *sync) const
+{
+    return mSyncSet.find(const_cast<Sync *>(sync)) != mSyncSet.end();
+}
+
+bool Display::hasExistingWindowSurface(EGLNativeWindowType window)
+{
+    WindowSurfaceMap *windowSurfaces = GetWindowSurfaces();
+    ASSERT(windowSurfaces);
+
+    return windowSurfaces->find(window) != windowSurfaces->end();
+}
+
+static ClientExtensions GenerateClientExtensions()
+{
+    ClientExtensions extensions;
+
+    extensions.clientExtensions = true;
+    extensions.platformBase     = true;
+    extensions.platformANGLE    = true;
+
+#if defined(ANGLE_ENABLE_D3D9) || defined(ANGLE_ENABLE_D3D11)
+    extensions.platformANGLED3D = true;
+    extensions.platformDevice   = true;
+#endif
+
+#if defined(ANGLE_USE_GBM)
+    extensions.platformGbmKHR = true;
+#endif
+
+#if defined(ANGLE_USE_WAYLAND)
+    extensions.platformWaylandEXT = true;
+#endif
+
+#if defined(ANGLE_ENABLE_D3D11)
+#    if defined(ANGLE_ENABLE_WINDOWS_UWP)
+    extensions.platformANGLED3D11ON12 = true;
+#    else
+    extensions.platformANGLED3D11ON12 = IsWindows10OrGreater();
+#    endif
+    extensions.platformANGLEDeviceId = true;
+#endif
+
+#if defined(ANGLE_ENABLE_OPENGL)
+    extensions.platformANGLEOpenGL = true;
+#endif
+
+#if defined(ANGLE_ENABLE_NULL)
+    extensions.platformANGLENULL = true;
+#endif
+
+#if defined(ANGLE_ENABLE_D3D11)
+    extensions.deviceCreation          = true;
+    extensions.deviceCreationD3D11     = true;
+    extensions.experimentalPresentPath = true;
+#endif
+
+#if defined(ANGLE_ENABLE_VULKAN)
+    extensions.platformANGLEVulkan   = true;
+    extensions.platformANGLEDeviceId = true;
+#endif
+
+#if defined(ANGLE_ENABLE_SWIFTSHADER)
+    extensions.platformANGLEDeviceTypeSwiftShader = true;
+#endif
+
+#if defined(ANGLE_ENABLE_METAL)
+    extensions.platformANGLEMetal    = true;
+    extensions.platformANGLEDeviceId = true;
+#endif
+
+#if defined(ANGLE_USE_X11)
+    extensions.x11Visual = true;
+#endif
+
+#if defined(ANGLE_PLATFORM_LINUX)
+    extensions.platformANGLEDeviceTypeEGLANGLE = true;
+#endif
+
+#if (defined(ANGLE_PLATFORM_IOS) && !defined(ANGLE_PLATFORM_MACCATALYST)) || \
+    (defined(ANGLE_PLATFORM_MACCATALYST) && defined(ANGLE_CPU_ARM64))
+    extensions.platformANGLEDeviceContextVolatileEagl = true;
+#endif
+
+#if defined(ANGLE_PLATFORM_MACOS) || defined(ANGLE_PLATFORM_MACCATALYST)
+    extensions.platformANGLEDeviceContextVolatileCgl = true;
+#endif
+
+#if defined(ANGLE_ENABLE_METAL)
+    extensions.displayPowerPreferenceANGLE = true;
+#endif
+
+    extensions.clientGetAllProcAddresses = true;
+    extensions.debug                     = true;
+    extensions.featureControlANGLE       = true;
+    extensions.deviceQueryEXT            = true;
+
+    return extensions;
+}
+
+template <typename T>
+static std::string GenerateExtensionsString(const T &extensions)
+{
+    std::vector<std::string> extensionsVector = extensions.getStrings();
+
+    std::ostringstream stream;
+    std::copy(extensionsVector.begin(), extensionsVector.end(),
+              std::ostream_iterator<std::string>(stream, " "));
+    return stream.str();
+}
+
+// static
+const ClientExtensions &Display::GetClientExtensions()
+{
+    static const ClientExtensions clientExtensions = GenerateClientExtensions();
+    return clientExtensions;
+}
+
+// static
+const std::string &Display::GetClientExtensionString()
+{
+    static const angle::base::NoDestructor<std::string> clientExtensionsString(
+        GenerateExtensionsString(GetClientExtensions()));
+    return *clientExtensionsString;
+}
+
+void Display::initDisplayExtensions()
+{
+    mDisplayExtensions = mImplementation->getExtensions();
+
+    // Some extensions are always available because they are implemented in the EGL layer.
+    mDisplayExtensions.createContext        = true;
+    mDisplayExtensions.createContextNoError = !mFrontendFeatures.forceGlErrorChecking.enabled;
+    mDisplayExtensions.createContextWebGLCompatibility    = true;
+    mDisplayExtensions.createContextBindGeneratesResource = true;
+    mDisplayExtensions.createContextClientArrays          = true;
+    mDisplayExtensions.pixelFormatFloat                   = true;
+    mDisplayExtensions.reusableSyncKHR                    = true;
+
+    // Force EGL_KHR_get_all_proc_addresses on.
+    mDisplayExtensions.getAllProcAddresses = true;
+
+    // Enable program cache control since it is not back-end dependent.
+    mDisplayExtensions.programCacheControlANGLE = true;
+
+    // Request extension is implemented in the ANGLE frontend
+    mDisplayExtensions.createContextExtensionsEnabled = true;
+
+    // Blob cache extension is provided by the ANGLE frontend
+    mDisplayExtensions.blobCache = true;
+
+    // The EGL_ANDROID_recordable extension is provided by the ANGLE frontend, and will always
+    // say that ANativeWindow is not recordable.
+    mDisplayExtensions.recordable = true;
+
+    // All backends support specific context versions
+    mDisplayExtensions.createContextBackwardsCompatible = true;
+
+    mDisplayExtensionString = GenerateExtensionsString(mDisplayExtensions);
+}
+
+bool Display::isValidNativeWindow(EGLNativeWindowType window) const
+{
+    return mImplementation->isValidNativeWindow(window);
+}
+
+Error Display::validateClientBuffer(const Config *configuration,
+                                    EGLenum buftype,
+                                    EGLClientBuffer clientBuffer,
+                                    const AttributeMap &attribs) const
+{
+    return mImplementation->validateClientBuffer(configuration, buftype, clientBuffer, attribs);
+}
+
+Error Display::validateImageClientBuffer(const gl::Context *context,
+                                         EGLenum target,
+                                         EGLClientBuffer clientBuffer,
+                                         const egl::AttributeMap &attribs) const
+{
+    return mImplementation->validateImageClientBuffer(context, target, clientBuffer, attribs);
+}
+
+Error Display::valdiatePixmap(const Config *config,
+                              EGLNativePixmapType pixmap,
+                              const AttributeMap &attributes) const
+{
+    return mImplementation->validatePixmap(config, pixmap, attributes);
+}
+
+bool Display::isValidDisplay(const egl::Display *display)
+{
+    const ANGLEPlatformDisplayMap *anglePlatformDisplayMap = GetANGLEPlatformDisplayMap();
+    for (const auto &displayPair : *anglePlatformDisplayMap)
+    {
+        if (displayPair.second == display)
+        {
+            return true;
+        }
+    }
+
+    const DevicePlatformDisplayMap *devicePlatformDisplayMap = GetDevicePlatformDisplayMap();
+    for (const auto &displayPair : *devicePlatformDisplayMap)
+    {
+        if (displayPair.second == display)
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool Display::isValidNativeDisplay(EGLNativeDisplayType display)
+{
+    // TODO(jmadill): handle this properly
+    if (display == EGL_DEFAULT_DISPLAY)
+    {
+        return true;
+    }
+
+#if defined(ANGLE_PLATFORM_WINDOWS) && !defined(ANGLE_ENABLE_WINDOWS_UWP)
+    if (display == EGL_SOFTWARE_DISPLAY_ANGLE || display == EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE ||
+        display == EGL_D3D11_ONLY_DISPLAY_ANGLE)
+    {
+        return true;
+    }
+    return (WindowFromDC(display) != nullptr);
+#else
+    return true;
+#endif
+}
+
+void Display::initVendorString()
+{
+    mVendorString                = "Google Inc.";
+    std::string vendorStringImpl = mImplementation->getVendorString();
+    if (!vendorStringImpl.empty())
+    {
+        mVendorString += " (" + vendorStringImpl + ")";
+    }
+}
+
+void Display::initVersionString()
+{
+    mVersionString = mImplementation->getVersionString(true);
+}
+
+void Display::initClientAPIString()
+{
+    // If the max supported desktop version is not None, we support a desktop GL frontend.
+    if (mImplementation->getMaxSupportedDesktopVersion().valid())
+    {
+        mClientAPIString = "OpenGL_ES OpenGL";
+    }
+    else
+    {
+        mClientAPIString = "OpenGL_ES";
+    }
+}
+
+void Display::initializeFrontendFeatures()
+{
+    // Enable on all Impls
+    ANGLE_FEATURE_CONDITION((&mFrontendFeatures), loseContextOnOutOfMemory, true);
+    ANGLE_FEATURE_CONDITION((&mFrontendFeatures), allowCompressedFormats, true);
+
+    // No longer enable this on any Impl - crbug.com/1165751
+    ANGLE_FEATURE_CONDITION((&mFrontendFeatures), scalarizeVecAndMatConstructorArgs, false);
+
+    // Disabled by default. To reduce the risk, create a feature to enable
+    // compressing pipeline cache in multi-thread pool.
+    ANGLE_FEATURE_CONDITION(&mFrontendFeatures, enableCompressingPipelineCacheInThreadPool, false);
+
+    // Disabled by default until work on the extension is complete - anglebug.com/7279.
+    ANGLE_FEATURE_CONDITION(&mFrontendFeatures, emulatePixelLocalStorage, false);
+
+    mImplementation->initializeFrontendFeatures(&mFrontendFeatures);
+
+    rx::ApplyFeatureOverrides(&mFrontendFeatures, mState);
+}
+
+const DisplayExtensions &Display::getExtensions() const
+{
+    return mDisplayExtensions;
+}
+
+const std::string &Display::getExtensionString() const
+{
+    return mDisplayExtensionString;
+}
+
+const std::string &Display::getVendorString() const
+{
+    return mVendorString;
+}
+
+const std::string &Display::getVersionString() const
+{
+    return mVersionString;
+}
+
+const std::string &Display::getClientAPIString() const
+{
+    return mClientAPIString;
+}
+
+std::string Display::getBackendRendererDescription() const
+{
+    return mImplementation->getRendererDescription();
+}
+
+std::string Display::getBackendVendorString() const
+{
+    return mImplementation->getVendorString();
+}
+
+std::string Display::getBackendVersionString(bool includeFullVersion) const
+{
+    return mImplementation->getVersionString(includeFullVersion);
+}
+
+Device *Display::getDevice() const
+{
+    return mDevice;
+}
+
+Surface *Display::getWGLSurface() const
+{
+    return mSurface;
+}
+
+gl::Version Display::getMaxSupportedESVersion() const
+{
+    return mImplementation->getMaxSupportedESVersion();
+}
+
+EGLint Display::programCacheGetAttrib(EGLenum attrib) const
+{
+    switch (attrib)
+    {
+        case EGL_PROGRAM_CACHE_KEY_LENGTH_ANGLE:
+            return static_cast<EGLint>(BlobCache::kKeyLength);
+
+        case EGL_PROGRAM_CACHE_SIZE_ANGLE:
+            return static_cast<EGLint>(mMemoryProgramCache.entryCount());
+
+        default:
+            UNREACHABLE();
+            return 0;
+    }
+}
+
+Error Display::programCacheQuery(EGLint index,
+                                 void *key,
+                                 EGLint *keysize,
+                                 void *binary,
+                                 EGLint *binarysize)
+{
+    ASSERT(index >= 0 && index < static_cast<EGLint>(mMemoryProgramCache.entryCount()));
+
+    const BlobCache::Key *programHash = nullptr;
+    BlobCache::Value programBinary;
+    // TODO(jmadill): Make this thread-safe.
+    bool result =
+        mMemoryProgramCache.getAt(static_cast<size_t>(index), &programHash, &programBinary);
+    if (!result)
+    {
+        return EglBadAccess() << "Program binary not accessible.";
+    }
+
+    ASSERT(keysize && binarysize);
+
+    if (key)
+    {
+        ASSERT(*keysize == static_cast<EGLint>(BlobCache::kKeyLength));
+        memcpy(key, programHash->data(), BlobCache::kKeyLength);
+    }
+
+    if (binary)
+    {
+        // Note: we check the size here instead of in the validation code, since we need to
+        // access the cache as atomically as possible. It's possible that the cache contents
+        // could change between the validation size check and the retrieval.
+        if (programBinary.size() > static_cast<size_t>(*binarysize))
+        {
+            return EglBadAccess() << "Program binary too large or changed during access.";
+        }
+
+        memcpy(binary, programBinary.data(), programBinary.size());
+    }
+
+    *binarysize = static_cast<EGLint>(programBinary.size());
+    *keysize    = static_cast<EGLint>(BlobCache::kKeyLength);
+
+    return NoError();
+}
+
+Error Display::programCachePopulate(const void *key,
+                                    EGLint keysize,
+                                    const void *binary,
+                                    EGLint binarysize)
+{
+    ASSERT(keysize == static_cast<EGLint>(BlobCache::kKeyLength));
+
+    BlobCache::Key programHash;
+    memcpy(programHash.data(), key, BlobCache::kKeyLength);
+
+    if (!mMemoryProgramCache.putBinary(programHash, reinterpret_cast<const uint8_t *>(binary),
+                                       static_cast<size_t>(binarysize)))
+    {
+        return EglBadAccess() << "Failed to copy program binary into the cache.";
+    }
+
+    return NoError();
+}
+
+EGLint Display::programCacheResize(EGLint limit, EGLenum mode)
+{
+    switch (mode)
+    {
+        case EGL_PROGRAM_CACHE_RESIZE_ANGLE:
+        {
+            size_t initialSize = mMemoryProgramCache.size();
+            mMemoryProgramCache.resize(static_cast<size_t>(limit));
+            return static_cast<EGLint>(initialSize);
+        }
+
+        case EGL_PROGRAM_CACHE_TRIM_ANGLE:
+            return static_cast<EGLint>(mMemoryProgramCache.trim(static_cast<size_t>(limit)));
+
+        default:
+            UNREACHABLE();
+            return 0;
+    }
+}
+
+void Display::overrideFrontendFeatures(const std::vector<std::string> &featureNames, bool enabled)
+{
+    mFrontendFeatures.overrideFeatures(featureNames, enabled);
+}
+
+const char *Display::queryStringi(const EGLint name, const EGLint index)
+{
+    const char *result = nullptr;
+    switch (name)
+    {
+        case EGL_FEATURE_NAME_ANGLE:
+            result = mFeatures[index]->name;
+            break;
+        case EGL_FEATURE_CATEGORY_ANGLE:
+            result = angle::FeatureCategoryToString(mFeatures[index]->category);
+            break;
+        case EGL_FEATURE_DESCRIPTION_ANGLE:
+            result = mFeatures[index]->description;
+            break;
+        case EGL_FEATURE_BUG_ANGLE:
+            result = mFeatures[index]->bug;
+            break;
+        case EGL_FEATURE_STATUS_ANGLE:
+            result = angle::FeatureStatusToString(mFeatures[index]->enabled);
+            break;
+        case EGL_FEATURE_CONDITION_ANGLE:
+            result = mFeatures[index]->condition;
+            break;
+        default:
+            UNREACHABLE();
+            return nullptr;
+    }
+    return result;
+}
+
+EGLAttrib Display::queryAttrib(const EGLint attribute)
+{
+    EGLAttrib value = 0;
+    switch (attribute)
+    {
+        case EGL_DEVICE_EXT:
+            value = reinterpret_cast<EGLAttrib>(mDevice);
+            break;
+
+        case EGL_FEATURE_COUNT_ANGLE:
+            value = mFeatures.size();
+            break;
+
+        default:
+            UNREACHABLE();
+    }
+    return value;
+}
+
+angle::ScratchBuffer Display::requestScratchBuffer()
+{
+    return requestScratchBufferImpl(&mScratchBuffers);
+}
+
+void Display::returnScratchBuffer(angle::ScratchBuffer scratchBuffer)
+{
+    returnScratchBufferImpl(std::move(scratchBuffer), &mScratchBuffers);
+}
+
+angle::ScratchBuffer Display::requestZeroFilledBuffer()
+{
+    return requestScratchBufferImpl(&mZeroFilledBuffers);
+}
+
+void Display::returnZeroFilledBuffer(angle::ScratchBuffer zeroFilledBuffer)
+{
+    returnScratchBufferImpl(std::move(zeroFilledBuffer), &mZeroFilledBuffers);
+}
+
+angle::ScratchBuffer Display::requestScratchBufferImpl(
+    std::vector<angle::ScratchBuffer> *bufferVector)
+{
+    std::lock_guard<std::mutex> lock(mScratchBufferMutex);
+    if (!bufferVector->empty())
+    {
+        angle::ScratchBuffer buffer = std::move(bufferVector->back());
+        bufferVector->pop_back();
+        return buffer;
+    }
+
+    return angle::ScratchBuffer(kScratchBufferLifetime);
+}
+
+void Display::returnScratchBufferImpl(angle::ScratchBuffer scratchBuffer,
+                                      std::vector<angle::ScratchBuffer> *bufferVector)
+{
+    std::lock_guard<std::mutex> lock(mScratchBufferMutex);
+    bufferVector->push_back(std::move(scratchBuffer));
+}
+
+Error Display::handleGPUSwitch()
+{
+    ANGLE_TRY(mImplementation->handleGPUSwitch());
+    initVendorString();
+    return NoError();
+}
+
+Error Display::forceGPUSwitch(EGLint gpuIDHigh, EGLint gpuIDLow)
+{
+    ANGLE_TRY(mImplementation->forceGPUSwitch(gpuIDHigh, gpuIDLow));
+    initVendorString();
+    return NoError();
+}
+
+bool Display::supportsDmaBufFormat(EGLint format) const
+{
+    return mImplementation->supportsDmaBufFormat(format);
+}
+
+Error Display::queryDmaBufFormats(EGLint max_formats, EGLint *formats, EGLint *num_formats)
+{
+    ANGLE_TRY(mImplementation->queryDmaBufFormats(max_formats, formats, num_formats));
+    return NoError();
+}
+
+Error Display::queryDmaBufModifiers(EGLint format,
+                                    EGLint max_modifiers,
+                                    EGLuint64KHR *modifiers,
+                                    EGLBoolean *external_only,
+                                    EGLint *num_modifiers)
+{
+    ANGLE_TRY(mImplementation->queryDmaBufModifiers(format, max_modifiers, modifiers, external_only,
+                                                    num_modifiers));
+    return NoError();
+}
+
+}  // namespace egl