kc3-lang/angle/util/EGLWindow.cpp

Branch : - branch - main - tag -

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  Commit

• Author : Shahbaz Youssefi
  Date : 2021-04-07 15:24:12
  Hash : 9bc837f6
  Message : Vulkan: Generate SPIR-V directly from the translator; Part 1 This is the first change in a series to generate SPIR-V directly from the translator's AST, instead of the generating text GLSL and feeding it to glslang. This change implements the majority of the work needed to map AST types to SPIR-V types, and declare types and interface variables in SPIR-V. Additionally, it lays the infrastructure to conditionally enabling this path in end2end tests. No tests are currently enabled as the change doesn't actually generate code for function bodies yet. Bug: angleproject:4889 Change-Id: Iacb28b6907fd48c50e4cc5a0e7ad72f6eed241d4 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2889603 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• util/EGLWindow.cpp

• //
  // Copyright 2013 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.
  //
  
  #include "util/EGLWindow.h"
  
  #include <cassert>
  #include <iostream>
  #include <vector>
  
  #include <string.h>
  
  #include "common/system_utils.h"
  #include "platform/PlatformMethods.h"
  #include "util/OSWindow.h"
  
  // ConfigParameters implementation.
  ConfigParameters::ConfigParameters()
      : redBits(-1),
        greenBits(-1),
        blueBits(-1),
        alphaBits(-1),
        depthBits(-1),
        stencilBits(-1),
        componentType(EGL_COLOR_COMPONENT_TYPE_FIXED_EXT),
        multisample(false),
        debug(false),
        noError(false),
        bindGeneratesResource(true),
        clientArraysEnabled(true),
        robustAccess(false),
        samples(-1),
        resetStrategy(EGL_NO_RESET_NOTIFICATION_EXT)
  {}
  
  ConfigParameters::~ConfigParameters() = default;
  
  void ConfigParameters::reset()
  {
      *this = ConfigParameters();
  }
  
  // GLWindowBase implementation.
  GLWindowBase::GLWindowBase(EGLint glesMajorVersion, EGLint glesMinorVersion)
      : mClientMajorVersion(glesMajorVersion), mClientMinorVersion(glesMinorVersion)
  {}
  
  GLWindowBase::~GLWindowBase() = default;
  
  // EGLWindow implementation.
  EGLWindow::EGLWindow(EGLint glesMajorVersion, EGLint glesMinorVersion)
      : GLWindowBase(glesMajorVersion, glesMinorVersion),
        mConfig(0),
        mDisplay(EGL_NO_DISPLAY),
        mSurface(EGL_NO_SURFACE),
        mContext(EGL_NO_CONTEXT),
        mEGLMajorVersion(0),
        mEGLMinorVersion(0)
  {}
  
  EGLWindow::~EGLWindow()
  {
      destroyGL();
  }
  
  void EGLWindow::swap()
  {
      eglSwapBuffers(mDisplay, mSurface);
  }
  
  EGLConfig EGLWindow::getConfig() const
  {
      return mConfig;
  }
  
  EGLDisplay EGLWindow::getDisplay() const
  {
      return mDisplay;
  }
  
  EGLSurface EGLWindow::getSurface() const
  {
      return mSurface;
  }
  
  EGLContext EGLWindow::getContext() const
  {
      return mContext;
  }
  
  bool EGLWindow::isContextVersion(EGLint glesMajorVersion, EGLint glesMinorVersion) const
  {
      return mClientMajorVersion == glesMajorVersion && mClientMinorVersion == glesMinorVersion;
  }
  
  bool EGLWindow::initializeGL(OSWindow *osWindow,
                               angle::Library *glWindowingLibrary,
                               angle::GLESDriverType driverType,
                               const EGLPlatformParameters &platformParams,
                               const ConfigParameters &configParams)
  {
      if (!initializeDisplay(osWindow, glWindowingLibrary, driverType, platformParams))
          return false;
      if (!initializeSurface(osWindow, glWindowingLibrary, configParams))
          return false;
      if (!initializeContext())
          return false;
      return true;
  }
  
  bool EGLWindow::initializeDisplay(OSWindow *osWindow,
                                    angle::Library *glWindowingLibrary,
                                    angle::GLESDriverType driverType,
                                    const EGLPlatformParameters &params)
  {
  #if defined(ANGLE_USE_UTIL_LOADER)
      PFNEGLGETPROCADDRESSPROC getProcAddress;
      glWindowingLibrary->getAs("eglGetProcAddress", &getProcAddress);
      if (!getProcAddress)
      {
          fprintf(stderr, "Cannot load eglGetProcAddress\n");
          return false;
      }
  
      // Likely we will need to use a fallback to Library::getAs on non-ANGLE platforms.
      angle::LoadEGL(getProcAddress);
  #endif  // defined(ANGLE_USE_UTIL_LOADER)
  
      const char *extensionString =
          static_cast<const char *>(eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS));
  
      std::vector<EGLAttrib> displayAttributes;
      displayAttributes.push_back(EGL_PLATFORM_ANGLE_TYPE_ANGLE);
      displayAttributes.push_back(params.renderer);
      displayAttributes.push_back(EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE);
      displayAttributes.push_back(params.majorVersion);
      displayAttributes.push_back(EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE);
      displayAttributes.push_back(params.minorVersion);
  
      if (params.deviceType != EGL_DONT_CARE)
      {
          displayAttributes.push_back(EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE);
          displayAttributes.push_back(params.deviceType);
      }
  
      if (params.presentPath != EGL_DONT_CARE)
      {
          if (strstr(extensionString, "EGL_ANGLE_experimental_present_path") == nullptr)
          {
              destroyGL();
              return false;
          }
  
          displayAttributes.push_back(EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE);
          displayAttributes.push_back(params.presentPath);
      }
  
      // Set debug layer settings if requested.
      if (params.debugLayersEnabled != EGL_DONT_CARE)
      {
          displayAttributes.push_back(EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED_ANGLE);
          displayAttributes.push_back(params.debugLayersEnabled);
      }
  
      const bool hasFeatureVirtualizationANGLE =
          strstr(extensionString, "EGL_ANGLE_platform_angle_context_virtualization") != nullptr;
  
      if (params.contextVirtualization != EGL_DONT_CARE)
      {
          if (hasFeatureVirtualizationANGLE)
          {
              displayAttributes.push_back(EGL_PLATFORM_ANGLE_CONTEXT_VIRTUALIZATION_ANGLE);
              displayAttributes.push_back(params.contextVirtualization);
          }
          else
          {
              fprintf(stderr,
                      "EGL_ANGLE_platform_angle_context_virtualization extension not active\n");
          }
      }
  
      if (params.platformMethods)
      {
          static_assert(sizeof(EGLAttrib) == sizeof(params.platformMethods),
                        "Unexpected pointer size");
          displayAttributes.push_back(EGL_PLATFORM_ANGLE_PLATFORM_METHODS_ANGLEX);
          displayAttributes.push_back(reinterpret_cast<EGLAttrib>(params.platformMethods));
      }
  
      std::vector<const char *> disabledFeatureOverrides;
      std::vector<const char *> enabledFeatureOverrides;
  
      if (params.transformFeedbackFeature == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("supportsTransformFeedbackExtension");
          disabledFeatureOverrides.push_back("emulateTransformFeedback");
      }
  
      if (params.allocateNonZeroMemoryFeature == EGL_TRUE)
      {
          enabledFeatureOverrides.push_back("allocateNonZeroMemory");
      }
      else if (params.allocateNonZeroMemoryFeature == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("allocateNonZeroMemory");
      }
  
      if (params.emulateCopyTexImage2DFromRenderbuffers == EGL_TRUE)
      {
          enabledFeatureOverrides.push_back("emulate_copyteximage2d_from_renderbuffers");
      }
  
      if (params.shaderStencilOutputFeature == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("has_shader_stencil_output");
      }
  
      if (params.genMultipleMipsPerPassFeature == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("gen_multiple_mips_per_pass");
      }
  
      if (params.supportsVulkanViewportFlip == EGL_TRUE)
      {
          enabledFeatureOverrides.push_back("supportsViewportFlip");
      }
      else if (params.supportsVulkanViewportFlip == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("supportsViewportFlip");
      }
  
      switch (params.emulatedPrerotation)
      {
          case 90:
              enabledFeatureOverrides.push_back("emulatedPrerotation90");
              break;
          case 180:
              enabledFeatureOverrides.push_back("emulatedPrerotation180");
              break;
          case 270:
              enabledFeatureOverrides.push_back("emulatedPrerotation270");
              break;
          default:
              break;
      }
  
      if (params.asyncCommandQueueFeatureVulkan == EGL_TRUE)
      {
          // TODO(jmadill): Update feature names. b/172704839
          enabledFeatureOverrides.push_back("commandProcessor");
          enabledFeatureOverrides.push_back("asynchronousCommandProcessing");
      }
  
      if (params.directSPIRVGeneration == EGL_TRUE)
      {
          enabledFeatureOverrides.push_back("directSPIRVGeneration");
      }
  
      if (params.hasExplicitMemBarrierFeatureMtl == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("has_explicit_mem_barrier_mtl");
      }
  
      if (params.hasCheapRenderPassFeatureMtl == EGL_FALSE)
      {
          disabledFeatureOverrides.push_back("has_cheap_render_pass_mtl");
      }
  
      if (params.forceBufferGPUStorageFeatureMtl == EGL_TRUE)
      {
          enabledFeatureOverrides.push_back("force_buffer_gpu_storage_mtl");
      }
  
      if (params.emulatedVAOs == EGL_TRUE)
      {
          enabledFeatureOverrides.push_back("sync_vertex_arrays_to_default");
      }
  
      const bool hasFeatureControlANGLE =
          strstr(extensionString, "EGL_ANGLE_feature_control") != nullptr;
  
      if (!hasFeatureControlANGLE &&
          (!enabledFeatureOverrides.empty() || !disabledFeatureOverrides.empty()))
      {
          fprintf(stderr, "Missing EGL_ANGLE_feature_control.\n");
          destroyGL();
          return false;
      }
  
      if (!disabledFeatureOverrides.empty())
      {
          disabledFeatureOverrides.push_back(nullptr);
  
          displayAttributes.push_back(EGL_FEATURE_OVERRIDES_DISABLED_ANGLE);
          displayAttributes.push_back(reinterpret_cast<EGLAttrib>(disabledFeatureOverrides.data()));
      }
  
      if (hasFeatureControlANGLE)
      {
          // Always enable exposeNonConformantExtensionsAndVersions in ANGLE tests.
          enabledFeatureOverrides.push_back("exposeNonConformantExtensionsAndVersions");
          enabledFeatureOverrides.push_back(nullptr);
  
          displayAttributes.push_back(EGL_FEATURE_OVERRIDES_ENABLED_ANGLE);
          displayAttributes.push_back(reinterpret_cast<EGLAttrib>(enabledFeatureOverrides.data()));
      }
  
      displayAttributes.push_back(EGL_NONE);
  
      if (driverType == angle::GLESDriverType::SystemWGL)
          return false;
  
      if (driverType == angle::GLESDriverType::AngleEGL &&
          strstr(extensionString, "EGL_ANGLE_platform_angle"))
      {
          mDisplay = eglGetPlatformDisplay(EGL_PLATFORM_ANGLE_ANGLE,
                                           reinterpret_cast<void *>(osWindow->getNativeDisplay()),
                                           &displayAttributes[0]);
      }
      else
      {
          mDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
      }
  
      if (mDisplay == EGL_NO_DISPLAY)
      {
          fprintf(stderr, "Failed to get display: 0x%X\n", eglGetError());
          destroyGL();
          return false;
      }
  
      if (eglInitialize(mDisplay, &mEGLMajorVersion, &mEGLMinorVersion) == EGL_FALSE)
      {
          fprintf(stderr, "eglInitialize failed: 0x%X\n", eglGetError());
          destroyGL();
          return false;
      }
  
      mPlatform = params;
      return true;
  }
  
  bool EGLWindow::initializeSurface(OSWindow *osWindow,
                                    angle::Library *glWindowingLibrary,
                                    const ConfigParameters &params)
  {
      mConfigParams                 = params;
      const char *displayExtensions = eglQueryString(mDisplay, EGL_EXTENSIONS);
  
      std::vector<EGLint> configAttributes = {
          EGL_SURFACE_TYPE,
          EGL_WINDOW_BIT,
          EGL_RED_SIZE,
          (mConfigParams.redBits >= 0) ? mConfigParams.redBits : EGL_DONT_CARE,
          EGL_GREEN_SIZE,
          (mConfigParams.greenBits >= 0) ? mConfigParams.greenBits : EGL_DONT_CARE,
          EGL_BLUE_SIZE,
          (mConfigParams.blueBits >= 0) ? mConfigParams.blueBits : EGL_DONT_CARE,
          EGL_ALPHA_SIZE,
          (mConfigParams.alphaBits >= 0) ? mConfigParams.alphaBits : EGL_DONT_CARE,
          EGL_DEPTH_SIZE,
          (mConfigParams.depthBits >= 0) ? mConfigParams.depthBits : EGL_DONT_CARE,
          EGL_STENCIL_SIZE,
          (mConfigParams.stencilBits >= 0) ? mConfigParams.stencilBits : EGL_DONT_CARE,
          EGL_SAMPLE_BUFFERS,
          mConfigParams.multisample ? 1 : 0,
          EGL_SAMPLES,
          (mConfigParams.samples >= 0) ? mConfigParams.samples : EGL_DONT_CARE,
      };
  
      // Add dynamic attributes
      bool hasPixelFormatFloat = strstr(displayExtensions, "EGL_EXT_pixel_format_float") != nullptr;
      if (!hasPixelFormatFloat && mConfigParams.componentType != EGL_COLOR_COMPONENT_TYPE_FIXED_EXT)
      {
          fprintf(stderr, "Mising EGL_EXT_pixel_format_float.\n");
          destroyGL();
          return false;
      }
      if (hasPixelFormatFloat)
      {
          configAttributes.push_back(EGL_COLOR_COMPONENT_TYPE_EXT);
          configAttributes.push_back(mConfigParams.componentType);
      }
  
      // Finish the attribute list
      configAttributes.push_back(EGL_NONE);
  
      if (!FindEGLConfig(mDisplay, configAttributes.data(), &mConfig))
      {
          fprintf(stderr, "Could not find a suitable EGL config!\n");
          destroyGL();
          return false;
      }
  
      eglGetConfigAttrib(mDisplay, mConfig, EGL_RED_SIZE, &mConfigParams.redBits);
      eglGetConfigAttrib(mDisplay, mConfig, EGL_GREEN_SIZE, &mConfigParams.greenBits);
      eglGetConfigAttrib(mDisplay, mConfig, EGL_BLUE_SIZE, &mConfigParams.blueBits);
      eglGetConfigAttrib(mDisplay, mConfig, EGL_ALPHA_SIZE, &mConfigParams.alphaBits);
      eglGetConfigAttrib(mDisplay, mConfig, EGL_DEPTH_SIZE, &mConfigParams.depthBits);
      eglGetConfigAttrib(mDisplay, mConfig, EGL_STENCIL_SIZE, &mConfigParams.stencilBits);
      eglGetConfigAttrib(mDisplay, mConfig, EGL_SAMPLES, &mConfigParams.samples);
  
      std::vector<EGLint> surfaceAttributes;
      if (strstr(displayExtensions, "EGL_NV_post_sub_buffer") != nullptr)
      {
          surfaceAttributes.push_back(EGL_POST_SUB_BUFFER_SUPPORTED_NV);
          surfaceAttributes.push_back(EGL_TRUE);
      }
  
      bool hasRobustResourceInit =
          strstr(displayExtensions, "EGL_ANGLE_robust_resource_initialization") != nullptr;
      if (hasRobustResourceInit && mConfigParams.robustResourceInit.valid())
      {
          surfaceAttributes.push_back(EGL_ROBUST_RESOURCE_INITIALIZATION_ANGLE);
          surfaceAttributes.push_back(mConfigParams.robustResourceInit.value() ? EGL_TRUE
                                                                               : EGL_FALSE);
      }
  
      surfaceAttributes.push_back(EGL_NONE);
  
      osWindow->resetNativeWindow();
  
      mSurface = eglCreateWindowSurface(mDisplay, mConfig, osWindow->getNativeWindow(),
                                        &surfaceAttributes[0]);
      if (eglGetError() != EGL_SUCCESS || (mSurface == EGL_NO_SURFACE))
      {
          fprintf(stderr, "eglCreateWindowSurface failed: 0x%X\n", eglGetError());
          destroyGL();
          return false;
      }
  
  #if defined(ANGLE_USE_UTIL_LOADER)
      angle::LoadGLES(eglGetProcAddress);
  #endif  // defined(ANGLE_USE_UTIL_LOADER)
  
      return true;
  }
  
  EGLContext EGLWindow::createContext(EGLContext share) const
  {
      const char *displayExtensions = eglQueryString(mDisplay, EGL_EXTENSIONS);
  
      // EGL_KHR_create_context is required to request a ES3+ context.
      bool hasKHRCreateContext = strstr(displayExtensions, "EGL_KHR_create_context") != nullptr;
      if (mClientMajorVersion > 2 && !(mEGLMajorVersion > 1 || mEGLMinorVersion >= 5) &&
          !hasKHRCreateContext)
      {
          fprintf(stderr, "EGL_KHR_create_context incompatibility.\n");
          return EGL_NO_CONTEXT;
      }
  
      // EGL_CONTEXT_OPENGL_DEBUG is only valid as of EGL 1.5.
      bool hasDebug = mEGLMinorVersion >= 5;
      if (mConfigParams.debug && !hasDebug)
      {
          fprintf(stderr, "EGL 1.5 is required for EGL_CONTEXT_OPENGL_DEBUG.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasWebGLCompatibility =
          strstr(displayExtensions, "EGL_ANGLE_create_context_webgl_compatibility") != nullptr;
      if (mConfigParams.webGLCompatibility.valid() && !hasWebGLCompatibility)
      {
          fprintf(stderr, "EGL_ANGLE_create_context_webgl_compatibility missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasCreateContextExtensionsEnabled =
          strstr(displayExtensions, "EGL_ANGLE_create_context_extensions_enabled") != nullptr;
      if (mConfigParams.extensionsEnabled.valid() && !hasCreateContextExtensionsEnabled)
      {
          fprintf(stderr, "EGL_ANGLE_create_context_extensions_enabled missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasRobustness = strstr(displayExtensions, "EGL_EXT_create_context_robustness") != nullptr;
      if ((mConfigParams.robustAccess ||
           mConfigParams.resetStrategy != EGL_NO_RESET_NOTIFICATION_EXT) &&
          !hasRobustness)
      {
          fprintf(stderr, "EGL_EXT_create_context_robustness missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasBindGeneratesResource =
          strstr(displayExtensions, "EGL_CHROMIUM_create_context_bind_generates_resource") != nullptr;
      if (!mConfigParams.bindGeneratesResource && !hasBindGeneratesResource)
      {
          fprintf(stderr, "EGL_CHROMIUM_create_context_bind_generates_resource missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasClientArraysExtension =
          strstr(displayExtensions, "EGL_ANGLE_create_context_client_arrays") != nullptr;
      if (!mConfigParams.clientArraysEnabled && !hasClientArraysExtension)
      {
          // Non-default state requested without the extension present
          fprintf(stderr, "EGL_ANGLE_create_context_client_arrays missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasProgramCacheControlExtension =
          strstr(displayExtensions, "EGL_ANGLE_program_cache_control ") != nullptr;
      if (mConfigParams.contextProgramCacheEnabled.valid() && !hasProgramCacheControlExtension)
      {
          fprintf(stderr, "EGL_ANGLE_program_cache_control missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      bool hasKHRCreateContextNoError =
          strstr(displayExtensions, "EGL_KHR_create_context_no_error") != nullptr;
      if (mConfigParams.noError && !hasKHRCreateContextNoError)
      {
          fprintf(stderr, "EGL_KHR_create_context_no_error missing.\n");
          return EGL_NO_CONTEXT;
      }
  
      eglBindAPI(EGL_OPENGL_ES_API);
      if (eglGetError() != EGL_SUCCESS)
      {
          fprintf(stderr, "Error on eglBindAPI.\n");
          return EGL_NO_CONTEXT;
      }
  
      std::vector<EGLint> contextAttributes;
      if (hasKHRCreateContext)
      {
          contextAttributes.push_back(EGL_CONTEXT_MAJOR_VERSION_KHR);
          contextAttributes.push_back(mClientMajorVersion);
  
          contextAttributes.push_back(EGL_CONTEXT_MINOR_VERSION_KHR);
          contextAttributes.push_back(mClientMinorVersion);
  
          // Note that the Android loader currently doesn't handle this flag despite reporting 1.5.
          // Work around this by only using the debug bit when we request a debug context.
          if (hasDebug && mConfigParams.debug)
          {
              contextAttributes.push_back(EGL_CONTEXT_OPENGL_DEBUG);
              contextAttributes.push_back(mConfigParams.debug ? EGL_TRUE : EGL_FALSE);
          }
  
          // TODO (http://anglebug.com/5809)
          // Mesa does not allow EGL_CONTEXT_OPENGL_NO_ERROR_KHR for GLES1.
          if (hasKHRCreateContextNoError && mConfigParams.noError)
          {
              contextAttributes.push_back(EGL_CONTEXT_OPENGL_NO_ERROR_KHR);
              contextAttributes.push_back(mConfigParams.noError ? EGL_TRUE : EGL_FALSE);
          }
  
          if (mConfigParams.webGLCompatibility.valid())
          {
              contextAttributes.push_back(EGL_CONTEXT_WEBGL_COMPATIBILITY_ANGLE);
              contextAttributes.push_back(mConfigParams.webGLCompatibility.value() ? EGL_TRUE
                                                                                   : EGL_FALSE);
          }
  
          if (mConfigParams.extensionsEnabled.valid())
          {
              contextAttributes.push_back(EGL_EXTENSIONS_ENABLED_ANGLE);
              contextAttributes.push_back(mConfigParams.extensionsEnabled.value() ? EGL_TRUE
                                                                                  : EGL_FALSE);
          }
  
          if (hasRobustness)
          {
              contextAttributes.push_back(EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT);
              contextAttributes.push_back(mConfigParams.robustAccess ? EGL_TRUE : EGL_FALSE);
  
              contextAttributes.push_back(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT);
              contextAttributes.push_back(mConfigParams.resetStrategy);
          }
  
          if (hasBindGeneratesResource)
          {
              contextAttributes.push_back(EGL_CONTEXT_BIND_GENERATES_RESOURCE_CHROMIUM);
              contextAttributes.push_back(mConfigParams.bindGeneratesResource ? EGL_TRUE : EGL_FALSE);
          }
  
          if (hasClientArraysExtension)
          {
              contextAttributes.push_back(EGL_CONTEXT_CLIENT_ARRAYS_ENABLED_ANGLE);
              contextAttributes.push_back(mConfigParams.clientArraysEnabled ? EGL_TRUE : EGL_FALSE);
          }
  
          if (mConfigParams.contextProgramCacheEnabled.valid())
          {
              contextAttributes.push_back(EGL_CONTEXT_PROGRAM_BINARY_CACHE_ENABLED_ANGLE);
              contextAttributes.push_back(
                  mConfigParams.contextProgramCacheEnabled.value() ? EGL_TRUE : EGL_FALSE);
          }
  
          bool hasBackwardsCompatibleContextExtension =
              strstr(displayExtensions, "EGL_ANGLE_create_context_backwards_compatible") != nullptr;
          if (hasBackwardsCompatibleContextExtension)
          {
              // Always request the exact context version that the config wants
              contextAttributes.push_back(EGL_CONTEXT_OPENGL_BACKWARDS_COMPATIBLE_ANGLE);
              contextAttributes.push_back(EGL_FALSE);
          }
  
          bool hasRobustResourceInit =
              strstr(displayExtensions, "EGL_ANGLE_robust_resource_initialization") != nullptr;
          if (hasRobustResourceInit && mConfigParams.robustResourceInit.valid())
          {
              contextAttributes.push_back(EGL_ROBUST_RESOURCE_INITIALIZATION_ANGLE);
              contextAttributes.push_back(mConfigParams.robustResourceInit.value() ? EGL_TRUE
                                                                                   : EGL_FALSE);
          }
      }
      contextAttributes.push_back(EGL_NONE);
  
      EGLContext context = eglCreateContext(mDisplay, mConfig, share, &contextAttributes[0]);
      if (context == EGL_NO_CONTEXT)
      {
          fprintf(stderr, "eglCreateContext failed: 0x%X\n", eglGetError());
          return EGL_NO_CONTEXT;
      }
  
      return context;
  }
  
  bool EGLWindow::initializeContext()
  {
      mContext = createContext(EGL_NO_CONTEXT);
      if (mContext == EGL_NO_CONTEXT)
      {
          destroyGL();
          return false;
      }
  
      if (!makeCurrent())
      {
          destroyGL();
          return false;
      }
  
      return true;
  }
  
  void EGLWindow::destroyGL()
  {
      destroyContext();
      destroySurface();
  
      if (mDisplay != EGL_NO_DISPLAY)
      {
          eglMakeCurrent(mDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
          eglTerminate(mDisplay);
          mDisplay = EGL_NO_DISPLAY;
      }
  }
  
  void EGLWindow::destroySurface()
  {
      if (mSurface != EGL_NO_SURFACE)
      {
          eglMakeCurrent(mDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
          assert(mDisplay != EGL_NO_DISPLAY);
          eglDestroySurface(mDisplay, mSurface);
          mSurface = EGL_NO_SURFACE;
      }
  }
  
  void EGLWindow::destroyContext()
  {
      if (mContext != EGL_NO_CONTEXT)
      {
          eglMakeCurrent(mDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
          assert(mDisplay != EGL_NO_DISPLAY);
          eglDestroyContext(mDisplay, mContext);
          mContext = EGL_NO_CONTEXT;
      }
  }
  
  bool EGLWindow::isGLInitialized() const
  {
      return mSurface != EGL_NO_SURFACE && mContext != EGL_NO_CONTEXT && mDisplay != EGL_NO_DISPLAY;
  }
  
  // Find an EGLConfig that is an exact match for the specified attributes. EGL_FALSE is returned if
  // the EGLConfig is found.  This indicates that the EGLConfig is not supported.  Surface type is
  // special-cased as it's possible for a config to return support for both EGL_WINDOW_BIT and
  // EGL_PBUFFER_BIT even though only one of them is requested.
  EGLBoolean EGLWindow::FindEGLConfig(EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *config)
  {
      EGLint numConfigs = 0;
      eglGetConfigs(dpy, nullptr, 0, &numConfigs);
      std::vector<EGLConfig> allConfigs(numConfigs);
      eglGetConfigs(dpy, allConfigs.data(), static_cast<EGLint>(allConfigs.size()), &numConfigs);
  
      for (size_t i = 0; i < allConfigs.size(); i++)
      {
          bool matchFound = true;
          for (const EGLint *curAttrib = attrib_list; curAttrib[0] != EGL_NONE; curAttrib += 2)
          {
              if (curAttrib[1] == EGL_DONT_CARE)
              {
                  continue;
              }
  
              EGLint actualValue = EGL_DONT_CARE;
              eglGetConfigAttrib(dpy, allConfigs[i], curAttrib[0], &actualValue);
              if ((curAttrib[0] == EGL_SURFACE_TYPE &&
                   (curAttrib[1] & actualValue) != curAttrib[1]) ||
                  (curAttrib[0] != EGL_SURFACE_TYPE && curAttrib[1] != actualValue))
              {
                  matchFound = false;
                  break;
              }
          }
  
          if (matchFound)
          {
              *config = allConfigs[i];
              return EGL_TRUE;
          }
      }
  
      return EGL_FALSE;
  }
  
  bool EGLWindow::makeCurrent()
  {
      if (eglMakeCurrent(mDisplay, mSurface, mSurface, mContext) == EGL_FALSE ||
          eglGetError() != EGL_SUCCESS)
      {
          fprintf(stderr, "Error during eglMakeCurrent.\n");
          return false;
      }
  
      return true;
  }
  
  bool EGLWindow::setSwapInterval(EGLint swapInterval)
  {
      if (eglSwapInterval(mDisplay, swapInterval) == EGL_FALSE || eglGetError() != EGL_SUCCESS)
      {
          fprintf(stderr, "Error during eglSwapInterval.\n");
          return false;
      }
  
      return true;
  }
  
  bool EGLWindow::hasError() const
  {
      return eglGetError() != EGL_SUCCESS;
  }
  
  angle::GenericProc EGLWindow::getProcAddress(const char *name)
  {
      return eglGetProcAddress(name);
  }
  
  // static
  void GLWindowBase::Delete(GLWindowBase **window)
  {
      delete *window;
      *window = nullptr;
  }
  
  // static
  EGLWindow *EGLWindow::New(EGLint glesMajorVersion, EGLint glesMinorVersion)
  {
      return new EGLWindow(glesMajorVersion, glesMinorVersion);
  }
  
  // static
  void EGLWindow::Delete(EGLWindow **window)
  {
      delete *window;
      *window = nullptr;
  }