kc3-lang/angle/samples/sample_util/SampleApplication.cpp

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• Author : Geoff Lang
  Date : 2019-06-04 15:16:24
  Hash : eef34e17
  Message : Don't request backend version in the sample application. The major and minor versions in EGLPlatformParameters are for the backend version (eg D3D 10 vs 10.1 vs 11.0), not the GLES version exposed. BUG=angleproject:3499 Change-Id: I4bf89769b4eab397cdc2e3c51ed94c1e57c4d54b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1643421 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>

• samples/sample_util/SampleApplication.cpp

• //
  // Copyright (c) 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 "SampleApplication.h"
  
  #include "util/EGLWindow.h"
  #include "util/gles_loader_autogen.h"
  #include "util/random_utils.h"
  #include "util/system_utils.h"
  
  #include <string.h>
  #include <iostream>
  #include <utility>
  
  namespace
  {
  const char *kUseAngleArg = "--use-angle=";
  
  using DisplayTypeInfo = std::pair<const char *, EGLint>;
  
  const DisplayTypeInfo kDisplayTypes[] = {
      {"d3d9", EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE}, {"d3d11", EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE},
      {"gl", EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE}, {"gles", EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE},
      {"null", EGL_PLATFORM_ANGLE_TYPE_NULL_ANGLE}, {"vulkan", EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE}};
  
  EGLint GetDisplayTypeFromArg(const char *displayTypeArg)
  {
      for (const auto &displayTypeInfo : kDisplayTypes)
      {
          if (strcmp(displayTypeInfo.first, displayTypeArg) == 0)
          {
              std::cout << "Using ANGLE back-end API: " << displayTypeInfo.first << std::endl;
              return displayTypeInfo.second;
          }
      }
  
      std::cout << "Unknown ANGLE back-end API: " << displayTypeArg << std::endl;
      return EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE;
  }
  }  // anonymous namespace
  
  SampleApplication::SampleApplication(std::string name,
                                       int argc,
                                       char **argv,
                                       EGLint glesMajorVersion,
                                       EGLint glesMinorVersion,
                                       size_t width,
                                       size_t height)
      : mName(std::move(name)),
        mWidth(width),
        mHeight(height),
        mRunning(false),
        mEGLWindow(nullptr),
        mOSWindow(nullptr)
  {
      mPlatformParams.renderer     = EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE;
  
      if (argc > 1 && strncmp(argv[1], kUseAngleArg, strlen(kUseAngleArg)) == 0)
      {
          mPlatformParams.renderer = GetDisplayTypeFromArg(argv[1] + strlen(kUseAngleArg));
      }
  
      // Load EGL library so we can initialize the display.
      mEntryPointsLib.reset(angle::OpenSharedLibrary(ANGLE_EGL_LIBRARY_NAME));
  
      mEGLWindow = EGLWindow::New(glesMajorVersion, glesMinorVersion);
      mTimer.reset(CreateTimer());
      mOSWindow = OSWindow::New();
  }
  
  SampleApplication::~SampleApplication()
  {
      EGLWindow::Delete(&mEGLWindow);
      OSWindow::Delete(&mOSWindow);
  }
  
  bool SampleApplication::initialize()
  {
      return true;
  }
  
  void SampleApplication::destroy() {}
  
  void SampleApplication::step(float dt, double totalTime) {}
  
  void SampleApplication::draw() {}
  
  void SampleApplication::swap()
  {
      mEGLWindow->swap();
  }
  
  OSWindow *SampleApplication::getWindow() const
  {
      return mOSWindow;
  }
  
  EGLConfig SampleApplication::getConfig() const
  {
      return mEGLWindow->getConfig();
  }
  
  EGLDisplay SampleApplication::getDisplay() const
  {
      return mEGLWindow->getDisplay();
  }
  
  EGLSurface SampleApplication::getSurface() const
  {
      return mEGLWindow->getSurface();
  }
  
  EGLContext SampleApplication::getContext() const
  {
      return mEGLWindow->getContext();
  }
  
  int SampleApplication::run()
  {
      if (!mOSWindow->initialize(mName, mWidth, mHeight))
      {
          return -1;
      }
  
      mOSWindow->setVisible(true);
  
      ConfigParameters configParams;
      configParams.redBits     = 8;
      configParams.greenBits   = 8;
      configParams.blueBits    = 8;
      configParams.alphaBits   = 8;
      configParams.depthBits   = 24;
      configParams.stencilBits = 8;
  
      if (!mEGLWindow->initializeGL(mOSWindow, mEntryPointsLib.get(), mPlatformParams, configParams))
      {
          return -1;
      }
  
      // Disable vsync
      if (!mEGLWindow->setSwapInterval(0))
      {
          return -1;
      }
  
      angle::LoadGLES(eglGetProcAddress);
  
      mRunning   = true;
      int result = 0;
  
      if (!initialize())
      {
          mRunning = false;
          result   = -1;
      }
  
      mTimer->start();
      double prevTime = 0.0;
  
      while (mRunning)
      {
          double elapsedTime = mTimer->getElapsedTime();
          double deltaTime   = elapsedTime - prevTime;
  
          step(static_cast<float>(deltaTime), elapsedTime);
  
          // Clear events that the application did not process from this frame
          Event event;
          while (popEvent(&event))
          {
              // If the application did not catch a close event, close now
              if (event.Type == Event::EVENT_CLOSED)
              {
                  exit();
              }
          }
  
          if (!mRunning)
          {
              break;
          }
  
          draw();
          swap();
  
          mOSWindow->messageLoop();
  
          prevTime = elapsedTime;
      }
  
      destroy();
      mEGLWindow->destroyGL();
      mOSWindow->destroy();
  
      return result;
  }
  
  void SampleApplication::exit()
  {
      mRunning = false;
  }
  
  bool SampleApplication::popEvent(Event *event)
  {
      return mOSWindow->popEvent(event);
  }