Cleanup renderer

This reverts commit daa3a8c06f.

build/android/app/CMakeLists.txt

@@ -62,8 +62,8 @@ add_library(kaliber SHARED
     ../../../src/demo/sky_quad.cc
     ../../../src/engine/animatable.cc
     ../../../src/engine/animator.cc
-    ../../../src/engine/audio/audio_driver_oboe.cc
     ../../../src/engine/audio/audio_mixer.cc
+    ../../../src/engine/audio/audio_sink_oboe.cc
     ../../../src/engine/drawable.cc
     ../../../src/engine/engine.cc
     ../../../src/engine/font.cc
@@ -74,7 +74,6 @@ add_library(kaliber SHARED
     ../../../src/engine/platform/asset_file_android.cc
     ../../../src/engine/platform/asset_file.cc
     ../../../src/engine/platform/platform_android.cc
-    ../../../src/engine/platform/platform.cc
     ../../../src/engine/renderer/geometry.cc
     ../../../src/engine/renderer/opengl/render_command.cc
     ../../../src/engine/renderer/opengl/renderer_opengl_android.cc

build/linux/Makefile

@@ -95,8 +95,8 @@ $(BASE_LIB): $(BASE_OBJS)
 ENGINE_SRC := \
   $(SRC_ROOT)/engine/animatable.cc \
   $(SRC_ROOT)/engine/animator.cc \
-  $(SRC_ROOT)/engine/audio/audio_driver_alsa.cc \
   $(SRC_ROOT)/engine/audio/audio_mixer.cc \
+  $(SRC_ROOT)/engine/audio/audio_sink_alsa.cc \
   $(SRC_ROOT)/engine/drawable.cc \
   $(SRC_ROOT)/engine/engine.cc \
   $(SRC_ROOT)/engine/font.cc \
@@ -106,7 +106,6 @@ ENGINE_SRC := \
   $(SRC_ROOT)/engine/persistent_data.cc \
   $(SRC_ROOT)/engine/platform/asset_file_linux.cc \
   $(SRC_ROOT)/engine/platform/asset_file.cc \
-  $(SRC_ROOT)/engine/platform/platform.cc \
   $(SRC_ROOT)/engine/platform/platform_linux.cc \
   $(SRC_ROOT)/engine/renderer/geometry.cc \
   $(SRC_ROOT)/engine/renderer/opengl/render_command.cc \

src/demo/credits.cc

@@ -95,7 +95,7 @@ void Credits::Show() {
 void Credits::Hide() {
   text_animator_.SetEndCallback(Animator::kBlending, [&]() -> void {
     for (int i = 0; i < kNumLines; ++i)
-      text_[i].Destory();
+      text_[i].Destroy();
     text_animator_.SetEndCallback(Animator::kBlending, nullptr);
     text_animator_.SetVisible(false);
   });

src/engine/audio/audio_driver.h

@@ -1,35 +0,0 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_H
-
-#include "engine/audio/audio_driver.h"
-
-namespace eng {
-
-class AudioDriverDelegate;
-
-// Models an audio sink sending mixed audio to the audio driver. Audio data from
-// the mixer source is delivered on a pull model using AudioDriverDelegate.
-class AudioDriver {
- public:
-  AudioDriver() = default;
-  virtual ~AudioDriver() = default;
-
-  virtual void SetDelegate(AudioDriverDelegate* delegate) = 0;
-
-  virtual bool Initialize() = 0;
-
-  virtual void Shutdown() = 0;
-
-  virtual void Suspend() = 0;
-  virtual void Resume() = 0;
-
-  virtual int GetHardwareSampleRate() = 0;
-
- private:
-  AudioDriver(const AudioDriver&) = delete;
-  AudioDriver& operator=(const AudioDriver&) = delete;
-};
-
-}  // namespace eng
-
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_H

src/engine/audio/audio_driver_delegate.h

@@ -1,18 +0,0 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_DELEGATE_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_DELEGATE_H
-
-#include <stddef.h>
-
-namespace eng {
-
-class AudioDriverDelegate {
- public:
-  AudioDriverDelegate() = default;
-  virtual ~AudioDriverDelegate() = default;
-
-  virtual void RenderAudio(float* output_buffer, size_t num_frames) = 0;
-};
-
-}  // namespace eng
-
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_DELEGATE_H

src/engine/audio/audio_mixer.cc

@@ -7,12 +7,26 @@
 #include "base/thread_pool.h"
 #include "engine/sound.h"
 
+#if defined(__ANDROID__)
+#include "engine/audio/audio_sink_oboe.h"
+#elif defined(__linux__)
+#include "engine/audio/audio_sink_alsa.h"
+#endif
+
 using namespace base;
 
 namespace eng {
 
 AudioMixer::AudioMixer()
-    : main_thread_task_runner_(TaskRunner::GetThreadLocalTaskRunner()) {}
+    : main_thread_task_runner_(TaskRunner::GetThreadLocalTaskRunner()),
+#if defined(__ANDROID__)
+      audio_sink_{std::make_unique<AudioSinkOboe>(this)} {
+#elif defined(__linux__)
+      audio_sink_{std::make_unique<AudioSinkAlsa>(this)} {
+#endif
+  bool res = audio_sink_->Initialize();
+  CHECK(res) << "Failed to initialize audio sink.";
+}
 
 AudioMixer::~AudioMixer() = default;
 
@@ -139,6 +153,18 @@ void AudioMixer::SetEndCallback(uint64_t resource_id, base::Closure cb) {
   it->second->end_cb = std::move(cb);
 }
 
+void AudioMixer::Suspend() {
+  audio_sink_->Suspend();
+}
+
+void AudioMixer::Resume() {
+  audio_sink_->Resume();
+}
+
+int AudioMixer::GetHardwareSampleRate() {
+  return audio_sink_->GetHardwareSampleRate();
+}
+
 void AudioMixer::RenderAudio(float* output_buffer, size_t num_frames) {
   {
     std::unique_lock<std::mutex> scoped_lock(lock_, std::try_to_lock);
@@ -238,7 +264,7 @@ void AudioMixer::RenderAudio(float* output_buffer, size_t num_frames) {
             ThreadPool::Get().PostTask(
                 HERE,
                 std::bind(&AudioMixer::DoStream, this, *it, flags & kLoop));
-          } else if (num_samples) {
+          } else {
             DLOG << "Mixer buffer underrun!";
           }
         }

src/engine/audio/audio_mixer.h

@@ -8,7 +8,7 @@
 #include <unordered_map>
 
 #include "base/closure.h"
-#include "engine/audio/audio_driver_delegate.h"
+#include "engine/audio/audio_sink_delegate.h"
 
 namespace base {
 class TaskRunner;
@@ -16,12 +16,13 @@ class TaskRunner;
 
 namespace eng {
 
+class AudioSink;
 class Sound;
 
-// Mix and render audio with low overhead. A platform specific AudioDriver
-// implementation is expected to periodically call Render() in a background
+// Mix and render audio with low overhead. A platform specific AudioSink
+// implementation is expected to periodically call RenderAudio() in a background
 // thread.
-class AudioMixer : public AudioDriverDelegate {
+class AudioMixer : public AudioSinkDelegate {
  public:
   AudioMixer();
   ~AudioMixer();
@@ -44,10 +45,16 @@ class AudioMixer : public AudioDriverDelegate {
 
   void SetEnableAudio(bool enable) { audio_enabled_ = enable; }
 
+  void Suspend();
+  void Resume();
+
+  int GetHardwareSampleRate();
+
  private:
   enum SampleFlags { kLoop = 1, kStopped = 2, kSimulateStereo = 4 };
   static constexpr int kChannelCount = 2;
 
+  // An audio resource that gets mixed and rendered to the audio sink.
   struct Resource {
     // Accessed by main thread only.
     bool active = false;
@@ -80,9 +87,12 @@ class AudioMixer : public AudioDriverDelegate {
 
   base::TaskRunner* main_thread_task_runner_;
 
+  std::unique_ptr<AudioSink> audio_sink_;
+
   bool audio_enabled_ = true;
 
-  // AudioDriverDelegate implementation
+  // AudioSinkDelegate implementation
+  int GetChannelCount() final { return kChannelCount; }
   void RenderAudio(float* output_buffer, size_t num_frames) final;
 
   void DoStream(std::shared_ptr<Resource> sample, bool loop);

src/engine/audio/audio_sink.h

@@ -0,0 +1,27 @@
+#ifndef ENGINE_AUDIO_AUDIO_SINK_H
+#define ENGINE_AUDIO_AUDIO_SINK_H
+
+namespace eng {
+
+// Models an audio sink sending mixed audio to the audio driver. Audio data from
+// the mixer source is delivered on a pull model using AudioSinkDelegate.
+class AudioSink {
+ public:
+  AudioSink() = default;
+  virtual ~AudioSink() = default;
+
+  virtual bool Initialize() = 0;
+
+  virtual void Suspend() = 0;
+  virtual void Resume() = 0;
+
+  virtual int GetHardwareSampleRate() = 0;
+
+ private:
+  AudioSink(const AudioSink&) = delete;
+  AudioSink& operator=(const AudioSink&) = delete;
+};
+
+}  // namespace eng
+
+#endif  // ENGINE_AUDIO_AUDIO_SINK_H

src/engine/audio/audio_sink_alsa.cc

@@ -1,27 +1,29 @@
-#include "engine/audio/audio_driver_alsa.h"
+#include "engine/audio/audio_sink_alsa.h"
 
 #include <memory>
 
 #include <alsa/asoundlib.h>
 
 #include "base/log.h"
-#include "engine/audio/audio_driver_delegate.h"
+#include "engine/audio/audio_sink_delegate.h"
 
 using namespace base;
 
 namespace eng {
 
-AudioDriverAlsa::AudioDriverAlsa() = default;
+AudioSinkAlsa::AudioSinkAlsa(AudioSinkDelegate* delegate)
+    : delegate_(delegate) {}
 
-AudioDriverAlsa::~AudioDriverAlsa() = default;
+AudioSinkAlsa::~AudioSinkAlsa() {
+  LOG << "Shutting down audio.";
 
-void AudioDriverAlsa::SetDelegate(AudioDriverDelegate* delegate) {
-  delegate_ = delegate;
-  Resume();
+  TerminateAudioThread();
+  snd_pcm_drop(device_);
+  snd_pcm_close(device_);
 }
 
-bool AudioDriverAlsa::Initialize() {
-  LOG << "Initializing audio system.";
+bool AudioSinkAlsa::Initialize() {
+  LOG << "Initializing audio.";
 
   int err;
 
@@ -142,35 +144,29 @@ bool AudioDriverAlsa::Initialize() {
   return false;
 }
 
-void AudioDriverAlsa::Shutdown() {
-  LOG << "Shutting down audio system.";
-  TerminateAudioThread();
-  snd_pcm_drop(device_);
-  snd_pcm_close(device_);
-}
-
-void AudioDriverAlsa::Suspend() {
+void AudioSinkAlsa::Suspend() {
   suspend_audio_thread_.store(true, std::memory_order_relaxed);
 }
 
-void AudioDriverAlsa::Resume() {
+void AudioSinkAlsa::Resume() {
   suspend_audio_thread_.store(false, std::memory_order_relaxed);
 }
 
-int AudioDriverAlsa::GetHardwareSampleRate() {
+int AudioSinkAlsa::GetHardwareSampleRate() {
   return sample_rate_;
 }
 
-void AudioDriverAlsa::StartAudioThread() {
+void AudioSinkAlsa::StartAudioThread() {
+  DCHECK(!audio_thread_.joinable());
+
   LOG << "Starting audio thread.";
   terminate_audio_thread_.store(false, std::memory_order_relaxed);
-  suspend_audio_thread_.store(delegate_ ? false : true,
-                              std::memory_order_relaxed);
-  audio_thread_ = std::thread(&AudioDriverAlsa::AudioThreadMain, this);
+  suspend_audio_thread_.store(false, std::memory_order_relaxed);
+  audio_thread_ = std::thread(&AudioSinkAlsa::AudioThreadMain, this);
 }
 
-void AudioDriverAlsa::TerminateAudioThread() {
-  if (terminate_audio_thread_.load(std::memory_order_relaxed))
+void AudioSinkAlsa::TerminateAudioThread() {
+  if (!audio_thread_.joinable())
     return;
 
   LOG << "Terminating audio thread";
@@ -179,7 +175,9 @@ void AudioDriverAlsa::TerminateAudioThread() {
   audio_thread_.join();
 }
 
-void AudioDriverAlsa::AudioThreadMain() {
+void AudioSinkAlsa::AudioThreadMain() {
+  DCHECK(delegate_);
+
   size_t num_frames = period_size_ / (num_channels_ * sizeof(float));
   auto buffer = std::make_unique<float[]>(num_frames * 2);
 

src/engine/audio/audio_sink_alsa.h

@@ -1,26 +1,24 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_ALSA_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_ALSA_H
+#ifndef ENGINE_AUDIO_AUDIO_SINK_ALSA_H
+#define ENGINE_AUDIO_AUDIO_SINK_ALSA_H
 
 #include <atomic>
 #include <thread>
 
-#include "engine/audio/audio_driver.h"
+#include "engine/audio/audio_sink.h"
 
 typedef struct _snd_pcm snd_pcm_t;
 
 namespace eng {
 
-class AudioDriverAlsa final : public AudioDriver {
- public:
-  AudioDriverAlsa();
-  ~AudioDriverAlsa() final;
+class AudioSinkDelegate;
 
-  void SetDelegate(AudioDriverDelegate* delegate) final;
+class AudioSinkAlsa final : public AudioSink {
+ public:
+  AudioSinkAlsa(AudioSinkDelegate* delegate);
+  ~AudioSinkAlsa() final;
 
   bool Initialize() final;
 
-  void Shutdown() final;
-
   void Suspend() final;
   void Resume() final;
 
@@ -38,7 +36,7 @@ class AudioDriverAlsa final : public AudioDriver {
   int sample_rate_ = 0;
   size_t period_size_ = 0;
 
-  AudioDriverDelegate* delegate_ = nullptr;
+  AudioSinkDelegate* delegate_ = nullptr;
 
   void StartAudioThread();
   void TerminateAudioThread();
@@ -48,4 +46,4 @@ class AudioDriverAlsa final : public AudioDriver {
 
 }  // namespace eng
 
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_ALSA_H
+#endif  // ENGINE_AUDIO_AUDIO_SINK_ALSA_H

src/engine/audio/audio_sink_delegate.h

@@ -0,0 +1,20 @@
+#ifndef ENGINE_AUDIO_AUDIO_SINK_DELEGATE_H
+#define ENGINE_AUDIO_AUDIO_SINK_DELEGATE_H
+
+#include <stddef.h>
+
+namespace eng {
+
+class AudioSinkDelegate {
+ public:
+  AudioSinkDelegate() = default;
+  virtual ~AudioSinkDelegate() = default;
+
+  virtual int GetChannelCount() = 0;
+
+  virtual void RenderAudio(float* output_buffer, size_t num_frames) = 0;
+};
+
+}  // namespace eng
+
+#endif  // ENGINE_AUDIO_AUDIO_SINK_DELEGATE_H

src/engine/audio/audio_sink_oboe.cc

@@ -1,76 +1,67 @@
-#include "engine/audio/audio_driver_oboe.h"
+#include "engine/audio/audio_sink_oboe.h"
 
 #include "base/log.h"
-#include "engine/audio/audio_driver_delegate.h"
+#include "engine/audio/audio_sink_delegate.h"
 #include "third_party/oboe/include/oboe/Oboe.h"
 
 using namespace base;
 
 namespace eng {
 
-AudioDriverOboe::AudioDriverOboe()
-    : callback_(std::make_unique<StreamCallback>(this)) {}
-
-AudioDriverOboe::~AudioDriverOboe() = default;
-
-void AudioDriverOboe::SetDelegate(AudioDriverDelegate* delegate) {
-  delegate_ = delegate;
-  stream_->start();
-}
-
-bool AudioDriverOboe::Initialize() {
-  LOG << "Initializing audio system.";
-
-  return RestartStream();
-}
-
-void AudioDriverOboe::Shutdown() {
-  LOG << "Shutting down audio system.";
+AudioSinkOboe::AudioSinkOboe(AudioSinkDelegate* delegate)
+    : callback_(std::make_unique<StreamCallback>(this)), delegate_(delegate) {}
 
+AudioSinkOboe::~AudioSinkOboe() {
+  LOG << "Shutting down audio.";
   stream_->stop();
 }
 
-void AudioDriverOboe::Suspend() {
+bool AudioSinkOboe::Initialize() {
+  LOG << "Initializing audio.";
+  return RestartStream();
+}
+
+void AudioSinkOboe::Suspend() {
   stream_->pause();
 }
 
-void AudioDriverOboe::Resume() {
+void AudioSinkOboe::Resume() {
   stream_->start();
 }
 
-int AudioDriverOboe::GetHardwareSampleRate() {
+int AudioSinkOboe::GetHardwareSampleRate() {
   return stream_->getSampleRate();
 }
 
-AudioDriverOboe::StreamCallback::StreamCallback(AudioDriverOboe* driver)
-    : driver_(driver) {}
+AudioSinkOboe::StreamCallback::StreamCallback(AudioSinkOboe* audio_sink)
+    : audio_sink_(audio_sink) {}
 
-AudioDriverOboe::StreamCallback::~StreamCallback() = default;
+AudioSinkOboe::StreamCallback::~StreamCallback() = default;
 
-oboe::DataCallbackResult AudioDriverOboe::StreamCallback::onAudioReady(
+oboe::DataCallbackResult AudioSinkOboe::StreamCallback::onAudioReady(
     oboe::AudioStream* oboe_stream,
     void* audio_data,
     int32_t num_frames) {
   float* output_buffer = static_cast<float*>(audio_data);
-  driver_->delegate_->RenderAudio(output_buffer, num_frames);
+  audio_sink_->delegate_->RenderAudio(output_buffer, num_frames);
   return oboe::DataCallbackResult::Continue;
 }
 
-void AudioDriverOboe::StreamCallback::onErrorAfterClose(
+void AudioSinkOboe::StreamCallback::onErrorAfterClose(
     oboe::AudioStream* oboe_stream,
     oboe::Result error) {
   LOG << "Error after close. Error: " << oboe::convertToText(error);
 
-  driver_->RestartStream();
+  audio_sink_->RestartStream();
 }
 
-bool AudioDriverOboe::RestartStream() {
+bool AudioSinkOboe::RestartStream() {
   oboe::AudioStreamBuilder builder;
   oboe::Result result =
       builder.setSharingMode(oboe::SharingMode::Exclusive)
           ->setPerformanceMode(oboe::PerformanceMode::LowLatency)
           ->setFormat(oboe::AudioFormat::Float)
-          ->setChannelCount(kChannelCount)
+          ->setChannelCount(delegate_->GetChannelCount())
           ->setDirection(oboe::Direction::Output)
           ->setUsage(oboe::Usage::Game)
           ->setCallback(callback_.get())
@@ -88,7 +79,6 @@ bool AudioDriverOboe::RestartStream() {
     return false;
   }
 
-  if (delegate_)
   stream_->start();
   return true;
 }

src/engine/audio/audio_sink_oboe.h

@@ -1,37 +1,33 @@
-#ifndef ENGINE_AUDIO_AUDIO_DRIVER_OBOE_H
-#define ENGINE_AUDIO_AUDIO_DRIVER_OBOE_H
+#ifndef ENGINE_AUDIO_AUDIO_SINK_OBOE_H
+#define ENGINE_AUDIO_AUDIO_SINK_OBOE_H
 
 #include <memory>
 
 #include "third_party/oboe/include/oboe/AudioStream.h"
 #include "third_party/oboe/include/oboe/AudioStreamCallback.h"
 
-#include "engine/audio/audio_driver.h"
+#include "engine/audio/audio_sink.h"
 
 namespace eng {
 
-class AudioDriverOboe final : public AudioDriver {
- public:
-  AudioDriverOboe();
-  ~AudioDriverOboe() final;
+class AudioSinkDelegate;
 
-  void SetDelegate(AudioDriverDelegate* delegate) final;
+class AudioSinkOboe final : public AudioSink {
+ public:
+  AudioSinkOboe(AudioSinkDelegate* delegate);
+  ~AudioSinkOboe() final;
 
   bool Initialize() final;
 
-  void Shutdown() final;
-
   void Suspend() final;
   void Resume() final;
 
   int GetHardwareSampleRate() final;
 
  private:
-  static constexpr int kChannelCount = 2;
-
   class StreamCallback final : public oboe::AudioStreamCallback {
    public:
-    StreamCallback(AudioDriverOboe* audio);
+    StreamCallback(AudioSinkOboe* audio);
     ~StreamCallback() final;
 
     oboe::DataCallbackResult onAudioReady(oboe::AudioStream* oboe_stream,
@@ -42,17 +38,17 @@ class AudioDriverOboe final : public AudioDriver {
                            oboe::Result error) final;
 
    private:
-    AudioDriverOboe* driver_;
+    AudioSinkOboe* audio_sink_;
   };
 
   oboe::ManagedStream stream_;
   std::unique_ptr<StreamCallback> callback_;
 
-  AudioDriverDelegate* delegate_ = nullptr;
+  AudioSinkDelegate* delegate_ = nullptr;
 
   bool RestartStream();
 };
 
 }  // namespace eng
 
-#endif  // ENGINE_AUDIO_AUDIO_DRIVER_OBOE_H
+#endif  // ENGINE_AUDIO_AUDIO_SINK_OBOE_H

src/engine/engine.cc

@@ -1,8 +1,8 @@
 #include "engine/engine.h"
 
 #include "base/log.h"
+#include "base/task_runner.h"
 #include "engine/animator.h"
-#include "engine/audio/audio_driver.h"
 #include "engine/audio/audio_mixer.h"
 #include "engine/drawable.h"
 #include "engine/font.h"
@@ -14,40 +14,52 @@
 #include "engine/mesh.h"
 #include "engine/platform/platform.h"
 #include "engine/renderer/geometry.h"
+#include "engine/renderer/opengl/renderer_opengl.h"
 #include "engine/renderer/renderer.h"
 #include "engine/renderer/shader.h"
 #include "engine/renderer/texture.h"
+#include "engine/renderer/vulkan/renderer_vulkan.h"
 #include "engine/shader_source.h"
 #include "third_party/texture_compressor/texture_compressor.h"
 
+#define USE_VULKAN_RENDERER 1
+
 using namespace base;
 
 namespace eng {
 
+extern void KaliberMain(Platform* platform) {
+  TaskRunner::CreateThreadLocalTaskRunner();
+  Engine(platform).Run();
+}
+
 Engine* Engine::singleton = nullptr;
 
-Engine::Engine(Platform* platform,
-               Renderer* renderer,
-               AudioDriver* audio_driver)
+Engine::Engine(Platform* platform)
     : platform_(platform),
-      renderer_(renderer),
-      audio_driver_(audio_driver),
-      audio_mixer_{std::make_unique<AudioMixer>()} {
+      audio_mixer_{std::make_unique<AudioMixer>()},
+      quad_{std::make_unique<Geometry>(nullptr)},
+      pass_through_shader_{std::make_unique<Shader>(nullptr)},
+      solid_shader_{std::make_unique<Shader>(nullptr)} {
   DCHECK(!singleton);
   singleton = this;
 
-  audio_driver_->SetDelegate(audio_mixer_.get());
-  renderer_->SetContextLostCB(std::bind(&Engine::ContextLost, this));
-
-  quad_ = CreateRenderResource<Geometry>();
-  pass_through_shader_ = CreateRenderResource<Shader>();
-  solid_shader_ = CreateRenderResource<Shader>();
+  platform_->SetObserver(this);
 
   stats_ = std::make_unique<ImageQuad>();
 }
 
 Engine::~Engine() {
+  LOG << "Shutting down engine.";
+
+  game_.reset();
   stats_.reset();
+  textures_.clear();
+  shaders_.clear();
+  quad_.reset();
+  pass_through_shader_.reset();
+  solid_shader_.reset();
+  renderer_.reset();
   singleton = nullptr;
 }
 
@@ -55,7 +67,43 @@ Engine& Engine::Get() {
   return *singleton;
 }
 
-bool Engine::Initialize() {
+void Engine::Run() {
+  Initialize();
+
+  timer_.Reset();
+  float accumulator = 0.0;
+  float frame_frac = 0.0f;
+
+  for (;;) {
+    Draw(frame_frac);
+
+    // Accumulate time.
+    timer_.Update();
+    accumulator += timer_.GetSecondsPassed();
+
+    // Subdivide the frame time using fixed time steps.
+    while (accumulator >= time_step_) {
+      TaskRunner::GetThreadLocalTaskRunner()->SingleConsumerRun();
+      platform_->Update();
+      Update(time_step_);
+      accumulator -= time_step_;
+
+      if (platform_->should_exit())
+        return;
+    };
+
+    // Calculate frame fraction from remainder of the frame time.
+    frame_frac = accumulator / time_step_;
+  }
+}
+
+void Engine::Initialize() {
+  LOG << "Initializing engine.";
+
+  thread_pool_.Initialize();
+
+  CreateRenderer(true);
+
   // Normalize viewport.
   if (GetScreenWidth() > GetScreenHeight()) {
     float aspect_ratio = (float)GetScreenWidth() / (float)GetScreenHeight();
@@ -71,52 +119,16 @@ bool Engine::Initialize() {
 
   LOG << "image scale factor: " << GetImageScaleFactor();
 
-  if (renderer_->SupportsDXT5()) {
-    tex_comp_alpha_ = TextureCompressor::Create(TextureCompressor::kFormatDXT5);
-  } else if (renderer_->SupportsATC()) {
-    tex_comp_alpha_ =
-        TextureCompressor::Create(TextureCompressor::kFormatATCIA);
-  }
-
-  if (renderer_->SupportsDXT1()) {
-    tex_comp_opaque_ =
-        TextureCompressor::Create(TextureCompressor::kFormatDXT1);
-  } else if (renderer_->SupportsATC()) {
-    tex_comp_opaque_ = TextureCompressor::Create(TextureCompressor::kFormatATC);
-  } else if (renderer_->SupportsETC1()) {
-    tex_comp_opaque_ =
-        TextureCompressor::Create(TextureCompressor::kFormatETC1);
-  }
-
   system_font_ = std::make_unique<Font>();
   system_font_->Load("engine/RobotoMono-Regular.ttf");
 
-  if (!CreateRenderResources())
-    return false;
-
   SetImageSource("stats_tex", std::bind(&Engine::PrintStats, this));
   stats_->SetZOrder(std::numeric_limits<int>::max());
 
   game_ = GameFactoryBase::CreateGame("");
-  if (!game_) {
-    LOG << "No game found to run.";
-    return false;
-  }
+  CHECK(game_) << "No game found to run.";
 
-  if (!game_->Initialize()) {
-    LOG << "Failed to initialize the game.";
-    return false;
-  }
-
-  return true;
-}
-
-void Engine::Shutdown() {
-  LOG << "Shutting down engine.";
-  game_.reset();
-  stats_->Destory();
-  textures_.clear();
-  shaders_.clear();
+  CHECK(game_->Initialize()) << "Failed to initialize the game.";
 }
 
 void Engine::Update(float delta_time) {
@@ -157,20 +169,6 @@ void Engine::Draw(float frame_frac) {
   renderer_->Present();
 }
 
-void Engine::LostFocus() {
-  audio_driver_->Suspend();
-
-  if (game_)
-    game_->LostFocus();
-}
-
-void Engine::GainedFocus(bool from_interstitial_ad) {
-  audio_driver_->Resume();
-
-  if (game_)
-    game_->GainedFocus(from_interstitial_ad);
-}
-
 void Engine::AddDrawable(Drawable* drawable) {
   DCHECK(std::find(drawables_.begin(), drawables_.end(), drawable) ==
          drawables_.end());
@@ -199,6 +197,32 @@ void Engine::RemoveAnimator(Animator* animator) {
   }
 }
 
+void Engine::CreateRenderer(bool vulkan) {
+  if ((dynamic_cast<RendererVulkan*>(renderer_.get()) && vulkan) ||
+      (dynamic_cast<RendererOpenGL*>(renderer_.get()) && !vulkan))
+    return;
+
+  if (vulkan)
+    renderer_ =
+        std::make_unique<RendererVulkan>(std::bind(&Engine::ContextLost, this));
+  else
+    renderer_ =
+        std::make_unique<RendererOpenGL>(std::bind(&Engine::ContextLost, this));
+
+  bool result = renderer_->Initialize(platform_);
+  if (!result && vulkan) {
+    LOG << "Failed to initialize " << renderer_->GetDebugName() << " renderer.";
+    LOG << "Fallback to OpenGL renderer.";
+    CreateRenderer(false);
+    return;
+  }
+  CHECK(result) << "Failed to initialize " << renderer_->GetDebugName()
+                << " renderer.";
+
+  CreateTextureCompressors();
+  ContextLost();
+}
+
 void Engine::Exit() {
   platform_->Exit();
 }
@@ -321,40 +345,6 @@ void Engine::RemoveCustomShader(const std::string& asset_name) {
   shaders_.erase(it);
 }
 
-void Engine::AddInputEvent(std::unique_ptr<InputEvent> event) {
-  if (replaying_)
-    return;
-
-  switch (event->GetType()) {
-    case InputEvent::kDragEnd:
-      if (((GetScreenSize() / 2) * 0.9f - event->GetVector()).Length() <=
-          0.25f) {
-        SetSatsVisible(!stats_->IsVisible());
-        // TODO: Enqueue DragCancel so we can consume this event.
-      }
-      break;
-    case InputEvent::kKeyPress:
-      if (event->GetKeyPress() == 's') {
-        SetSatsVisible(!stats_->IsVisible());
-        // Consume event.
-        return;
-      }
-      break;
-    case InputEvent::kDrag:
-      if (stats_->IsVisible()) {
-        if ((stats_->GetPosition() - event->GetVector()).Length() <=
-            stats_->GetSize().y)
-          stats_->SetPosition(event->GetVector());
-        // TODO: Enqueue DragCancel so we can consume this event.
-      }
-      break;
-    default:
-      break;
-  }
-
-  input_queue_.push_back(std::move(event));
-}
-
 std::unique_ptr<InputEvent> Engine::GetNextInputEvent() {
   std::unique_ptr<InputEvent> event;
 
@@ -481,32 +471,107 @@ const std::string& Engine::GetSharedDataPath() const {
 }
 
 int Engine::GetAudioHardwareSampleRate() {
-  return audio_driver_->GetHardwareSampleRate();
+  return audio_mixer_->GetHardwareSampleRate();
 }
 
 bool Engine::IsMobile() const {
   return platform_->mobile_device();
 }
 
+void Engine::OnWindowCreated() {
+  renderer_->Initialize(platform_);
+}
+
+void Engine::OnWindowDestroyed() {
+  renderer_->Shutdown();
+}
+
+void Engine::OnWindowResized(int width, int height) {
+  if (width != renderer_->screen_width() ||
+      height != renderer_->screen_height()) {
+    renderer_->Shutdown();
+    renderer_->Initialize(platform_);
+  }
+}
+
+void Engine::LostFocus() {
+  audio_mixer_->Suspend();
+
+  if (game_)
+    game_->LostFocus();
+}
+
+void Engine::GainedFocus(bool from_interstitial_ad) {
+  timer_.Reset();
+  audio_mixer_->Resume();
+
+  if (game_)
+    game_->GainedFocus(from_interstitial_ad);
+}
+
+void Engine::AddInputEvent(std::unique_ptr<InputEvent> event) {
+  if (replaying_)
+    return;
+
+  event->SetVector(ToPosition(event->GetVector()) * Vector2f(1, -1));
+
+  switch (event->GetType()) {
+    case InputEvent::kDragEnd:
+      if (((GetScreenSize() / 2) * 0.9f - event->GetVector()).Length() <=
+          0.25f) {
+        SetSatsVisible(!stats_->IsVisible());
+        // TODO: Enqueue DragCancel so we can consume this event.
+      }
+      break;
+    case InputEvent::kKeyPress:
+      if (event->GetKeyPress() == 's') {
+        SetSatsVisible(!stats_->IsVisible());
+        // Consume event.
+        return;
+      }
+      break;
+    case InputEvent::kDrag:
+      if (stats_->IsVisible()) {
+        if ((stats_->GetPosition() - event->GetVector()).Length() <=
+            stats_->GetSize().y)
+          stats_->SetPosition(event->GetVector());
+        // TODO: Enqueue DragCancel so we can consume this event.
+      }
+      break;
+    default:
+      break;
+  }
+
+  input_queue_.push_back(std::move(event));
+}
+
+void Engine::CreateTextureCompressors() {
+  tex_comp_alpha_.reset();
+  tex_comp_opaque_.reset();
+
+  if (renderer_->SupportsDXT5()) {
+    tex_comp_alpha_ = TextureCompressor::Create(TextureCompressor::kFormatDXT5);
+  } else if (renderer_->SupportsATC()) {
+    tex_comp_alpha_ =
+        TextureCompressor::Create(TextureCompressor::kFormatATCIA);
+  }
+
+  if (renderer_->SupportsDXT1()) {
+    tex_comp_opaque_ =
+        TextureCompressor::Create(TextureCompressor::kFormatDXT1);
+  } else if (renderer_->SupportsATC()) {
+    tex_comp_opaque_ = TextureCompressor::Create(TextureCompressor::kFormatATC);
+  } else if (renderer_->SupportsETC1()) {
+    tex_comp_opaque_ =
+        TextureCompressor::Create(TextureCompressor::kFormatETC1);
+  }
+}
+
 void Engine::ContextLost() {
-  CreateRenderResources();
+  quad_->SetRenderer(renderer_.get());
+  pass_through_shader_->SetRenderer(renderer_.get());
+  solid_shader_->SetRenderer(renderer_.get());
 
-  for (auto& t : textures_) {
-    t.second.texture->Destroy();
-    RefreshImage(t.first);
-  }
-
-  for (auto& s : shaders_) {
-    auto source = std::make_unique<ShaderSource>();
-    if (source->Load(s.second.file_name))
-      s.second.shader->Create(std::move(source), quad_->vertex_description(),
-                              quad_->primitive(), false);
-  }
-
-  game_->ContextLost();
-}
-
-bool Engine::CreateRenderResources() {
   // This creates a normalized unit sized quad.
   static const char vertex_description[] = "p2f;t2f";
   static const float vertices[] = {
@@ -521,23 +586,37 @@ bool Engine::CreateRenderResources() {
 
   // Create the shader we can reuse for texture rendering.
   auto source = std::make_unique<ShaderSource>();
-  if (!source->Load("engine/pass_through.glsl")) {
-    LOG << "Could not create pass through shader.";
-    return false;
-  }
+  if (source->Load("engine/pass_through.glsl")) {
     pass_through_shader_->Create(std::move(source), quad_->vertex_description(),
                                  quad_->primitive(), false);
+  } else {
+    LOG << "Could not create pass through shader.";
+  }
 
   // Create the shader we can reuse for solid rendering.
   source = std::make_unique<ShaderSource>();
-  if (!source->Load("engine/solid.glsl")) {
-    LOG << "Could not create solid shader.";
-    return false;
-  }
+  if (source->Load("engine/solid.glsl")) {
     solid_shader_->Create(std::move(source), quad_->vertex_description(),
                           quad_->primitive(), false);
+  } else {
+    LOG << "Could not create solid shader.";
+  }
 
-  return true;
+  for (auto& t : textures_) {
+    t.second.texture->SetRenderer(renderer_.get());
+    RefreshImage(t.first);
+  }
+
+  for (auto& s : shaders_) {
+    s.second.shader->SetRenderer(renderer_.get());
+    auto source = std::make_unique<ShaderSource>();
+    if (source->Load(s.second.file_name))
+      s.second.shader->Create(std::move(source), quad_->vertex_description(),
+                              quad_->primitive(), false);
+  }
+
+  if (game_)
+    game_->ContextLost();
 }
 
 void Engine::SetSatsVisible(bool visible) {
@@ -545,7 +624,7 @@ void Engine::SetSatsVisible(bool visible) {
   if (visible)
     stats_->Create("stats_tex");
   else
-    stats_->Destory();
+    stats_->Destroy();
 }
 
 std::unique_ptr<Image> Engine::PrintStats() {

src/engine/engine.h

@@ -8,15 +8,17 @@
 #include <unordered_map>
 
 #include "base/random.h"
+#include "base/thread_pool.h"
+#include "base/timer.h"
 #include "base/vecmath.h"
 #include "engine/persistent_data.h"
+#include "engine/platform/platform_observer.h"
 
 class TextureCompressor;
 
 namespace eng {
 
 class Animator;
-class AudioDriver;
 class AudioMixer;
 class Font;
 class Game;
@@ -30,24 +32,16 @@ class Shader;
 class Texture;
 class Platform;
 
-class Engine {
+class Engine : public PlatformObserver {
  public:
   using CreateImageCB = std::function<std::unique_ptr<Image>()>;
 
-  Engine(Platform* platform, Renderer* renderer, AudioDriver* audio_driver);
+  Engine(Platform* platform);
   ~Engine();
 
   static Engine& Get();
 
-  bool Initialize();
-
-  void Shutdown();
-
-  void Update(float delta_time);
-  void Draw(float frame_frac);
-
-  void LostFocus();
-  void GainedFocus(bool from_interstitial_ad);
+  void Run();
 
   void AddDrawable(Drawable* drawable);
   void RemoveDrawable(Drawable* drawable);
@@ -55,6 +49,8 @@ class Engine {
   void AddAnimator(Animator* animator);
   void RemoveAnimator(Animator* animator);
 
+  void CreateRenderer(bool vulkan);
+
   void Exit();
 
   // Convert size from pixels to viewport scale.
@@ -65,7 +61,7 @@ class Engine {
 
   template <typename T>
   std::unique_ptr<T> CreateRenderResource() {
-    return std::unique_ptr<T>(static_cast<T*>(new T(renderer_)));
+    return std::unique_ptr<T>(static_cast<T*>(new T(renderer_.get())));
   }
 
   void SetImageSource(const std::string& asset_name,
@@ -85,7 +81,6 @@ class Engine {
   Shader* GetCustomShader(const std::string& asset_name);
   void RemoveCustomShader(const std::string& asset_name);
 
-  void AddInputEvent(std::unique_ptr<InputEvent> event);
   std::unique_ptr<InputEvent> GetNextInputEvent();
 
   void StartRecording(const Json::Value& payload);
@@ -173,9 +168,8 @@ class Engine {
   static Engine* singleton;
 
   Platform* platform_ = nullptr;
-  Renderer* renderer_ = nullptr;
-  AudioDriver* audio_driver_ = nullptr;
 
+  std::unique_ptr<Renderer> renderer_;
   std::unique_ptr<AudioMixer> audio_mixer_;
   std::unique_ptr<Game> game_;
 
@@ -220,11 +214,26 @@ class Engine {
   bool replaying_ = false;
   unsigned int replay_index_ = 0;
 
+  base::ThreadPool thread_pool_;
+  base::Timer timer_;
   base::Randomf random_;
 
-  void ContextLost();
+  void Initialize();
 
-  bool CreateRenderResources();
+  void Update(float delta_time);
+  void Draw(float frame_frac);
+
+  // PlatformObserver implementation
+  void OnWindowCreated() final;
+  void OnWindowDestroyed() final;
+  void OnWindowResized(int width, int height) final;
+  void LostFocus() final;
+  void GainedFocus(bool from_interstitial_ad) final;
+  void AddInputEvent(std::unique_ptr<InputEvent> event) final;
+
+  void CreateTextureCompressors();
+
+  void ContextLost();
 
   void SetSatsVisible(bool visible);
   std::unique_ptr<Image> PrintStats();

src/engine/image_quad.cc

@@ -13,7 +13,7 @@ namespace eng {
 ImageQuad::ImageQuad() = default;
 
 ImageQuad::~ImageQuad() {
-  Destory();
+  Destroy();
 }
 
 void ImageQuad::Create(const std::string& asset_name,
@@ -32,7 +32,8 @@ void ImageQuad::Create(const std::string& asset_name,
   asset_name_ = asset_name;
 }
 
-void ImageQuad::Destory() {
+// TODO: typo
+void ImageQuad::Destroy() {
   if (texture_) {
     Engine::Get().ReleaseTexture(asset_name_);
     texture_ = nullptr;

src/engine/image_quad.h

@@ -24,7 +24,7 @@ class ImageQuad final : public Animatable {
               int frame_width = 0,
               int frame_height = 0);
 
-  void Destory();
+  void Destroy();
 
   void AutoScale();
 

src/engine/input_event.h

@@ -27,6 +27,8 @@ class InputEvent {
   InputEvent(Type type, char key) : type_(type), key_(key) {}
   ~InputEvent() = default;
 
+  void SetVector(base::Vector2f vec) { vec_ = vec; }
+
   Type GetType() const { return type_; }
 
   size_t GetPointerId() const { return pointer_id_; }

src/engine/platform/platform.cc

@@ -1,94 +0,0 @@
-#include "engine/platform/platform.h"
-
-#include "base/log.h"
-#include "base/task_runner.h"
-#include "engine/engine.h"
-#include "engine/renderer/opengl/renderer_opengl.h"
-#include "engine/renderer/vulkan/renderer_vulkan.h"
-
-#if defined(__ANDROID__)
-#include "engine/audio/audio_driver_oboe.h"
-#elif defined(__linux__)
-#include "engine/audio/audio_driver_alsa.h"
-#endif
-
-using namespace base;
-
-namespace eng {
-
-Platform::Platform() = default;
-
-Platform::~Platform() = default;
-
-void Platform::InitializeCommon() {
-  LOG << "Initializing platform.";
-
-  thread_pool_.Initialize();
-  TaskRunner::CreateThreadLocalTaskRunner();
-
-#if defined(__ANDROID__)
-  audio_driver_ = std::make_unique<AudioDriverOboe>();
-#elif defined(__linux__)
-  audio_driver_ = std::make_unique<AudioDriverAlsa>();
-#endif
-  bool res = audio_driver_->Initialize();
-  CHECK(res) << "Failed to initialize audio driver.";
-
-  auto context = std::make_unique<VulkanContext>();
-  if (context->Initialize()) {
-    renderer_ = std::make_unique<RendererVulkan>(std::move(context));
-  } else {
-    LOG << "Failed to initialize Vulkan context. Fallback to OpenGL.";
-    renderer_ = std::make_unique<RendererOpenGL>();
-  }
-}
-
-void Platform::ShutdownCommon() {
-  LOG << "Shutting down platform.";
-
-  audio_driver_->Shutdown();
-  renderer_->Shutdown();
-}
-
-void Platform::RunMainLoop() {
-  engine_ =
-      std::make_unique<Engine>(this, renderer_.get(), audio_driver_.get());
-  bool res = engine_->Initialize();
-  CHECK(res) << "Failed to initialize the engine.";
-
-  // Use fixed time steps.
-  float time_step = engine_->time_step();
-
-  timer_.Reset();
-  float accumulator = 0.0;
-  float frame_frac = 0.0f;
-
-  for (;;) {
-    engine_->Draw(frame_frac);
-
-    // Accumulate time.
-    timer_.Update();
-    accumulator += timer_.GetSecondsPassed();
-
-    // Subdivide the frame time.
-    while (accumulator >= time_step) {
-      TaskRunner::GetThreadLocalTaskRunner()->SingleConsumerRun();
-
-      Update();
-      engine_->Update(time_step);
-
-      if (should_exit_) {
-        thread_pool_.Shutdown();
-        engine_->Shutdown();
-        engine_.reset();
-        return;
-      }
-      accumulator -= time_step;
-    };
-
-    // Calculate frame fraction from remainder of the frame time.
-    frame_frac = accumulator / time_step;
-  }
-}
-
-}  // namespace eng

src/engine/platform/platform.h

@@ -1,12 +1,8 @@
 #ifndef ENGINE_PLATFORM_PLATFORM_H
 #define ENGINE_PLATFORM_PLATFORM_H
 
-#include <memory>
 #include <string>
 
-#include "base/thread_pool.h"
-#include "base/timer.h"
-
 #if defined(__ANDROID__)
 
 #include "../../base/vecmath.h"
@@ -24,27 +20,23 @@ struct ANativeWindow;
 
 namespace eng {
 
-class AudioDriver;
-class Renderer;
-class Engine;
+class PlatformObserver;
 
 class Platform {
  public:
-  Platform();
-  ~Platform();
-
 #if defined(__ANDROID__)
-  void Initialize(android_app* app);
+  Platform(android_app* app);
 #elif defined(__linux__)
-  void Initialize();
+  Platform();
 #endif
-
-  void Shutdown();
+  ~Platform();
 
   void Update();
 
   void Exit();
 
+  void SetObserver(PlatformObserver* observer) { observer_ = observer; }
+
   void Vibrate(int duration);
 
   void ShowInterstitialAd();
@@ -53,8 +45,6 @@ class Platform {
 
   void SetKeepScreenOn(bool keep_screen_on);
 
-  void RunMainLoop();
-
   int GetDeviceDpi() const { return device_dpi_; }
 
   const std::string& GetRootPath() const { return root_path_; }
@@ -65,9 +55,16 @@ class Platform {
 
   bool mobile_device() const { return mobile_device_; }
 
- protected:
-  base::Timer timer_;
+  bool should_exit() const { return should_exit_; }
 
+#if defined(__ANDROID__)
+  ANativeWindow* GetWindow();
+#elif defined(__linux__)
+  Display* GetDisplay();
+  Window GetWindow();
+#endif
+
+ private:
   bool mobile_device_ = false;
   int device_dpi_ = 100;
   std::string root_path_;
@@ -77,11 +74,7 @@ class Platform {
   bool has_focus_ = false;
   bool should_exit_ = false;
 
-  std::unique_ptr<AudioDriver> audio_driver_;
-  std::unique_ptr<Renderer> renderer_;
-  std::unique_ptr<Engine> engine_;
-
-  base::ThreadPool thread_pool_;
+  PlatformObserver* observer_ = nullptr;
 
 #if defined(__ANDROID__)
 
@@ -116,10 +109,9 @@ class Platform {
   bool CreateWindow(int width, int height);
   void DestroyWindow();
 
-#endif
+  XVisualInfo* GetXVisualInfo(Display* display);
 
-  void InitializeCommon();
-  void ShutdownCommon();
+#endif
 
   Platform(const Platform&) = delete;
   Platform& operator=(const Platform&) = delete;

src/engine/platform/platform_android.cc

@@ -1,15 +1,15 @@
 #include "engine/platform/platform.h"
 
+#include <memory>
+
 #include <android_native_app_glue.h>
 #include <dlfcn.h>
 #include <jni.h>
 #include <unistd.h>
 
 #include "base/log.h"
-#include "base/task_runner.h"
-#include "engine/engine.h"
 #include "engine/input_event.h"
-#include "engine/renderer/renderer.h"
+#include "engine/platform/platform_observer.h"
 
 using namespace base;
 
@@ -201,10 +201,12 @@ int32_t GetDensityDpi(android_app* app) {
 
 namespace eng {
 
+void KaliberMain(Platform* platform);
+
 int32_t Platform::HandleInput(android_app* app, AInputEvent* event) {
   Platform* platform = reinterpret_cast<Platform*>(app->userData);
 
-  if (!platform->engine_)
+  if (!platform->observer_)
     return 0;
 
   if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_KEY &&
@@ -212,7 +214,7 @@ int32_t Platform::HandleInput(android_app* app, AInputEvent* event) {
     if (AKeyEvent_getAction(event) == AKEY_EVENT_ACTION_UP) {
       auto input_event =
           std::make_unique<InputEvent>(InputEvent::kNavigateBack);
-      platform->engine_->AddInputEvent(std::move(input_event));
+      platform->observer_->AddInputEvent(std::move(input_event));
     }
     return 1;
   } else if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_MOTION) {
@@ -227,7 +229,6 @@ int32_t Platform::HandleInput(android_app* app, AInputEvent* event) {
       int32_t id = AMotionEvent_getPointerId(event, i);
       if (id < 2) {
         pos[id] = {AMotionEvent_getX(event, i), AMotionEvent_getY(event, i)};
-        pos[id] = platform->engine_->ToPosition(pos[id]);
       }
     }
 
@@ -239,34 +240,30 @@ int32_t Platform::HandleInput(android_app* app, AInputEvent* event) {
     switch (flags) {
       case AMOTION_EVENT_ACTION_DOWN:
       case AMOTION_EVENT_ACTION_POINTER_DOWN:
-        // DLOG << "AMOTION_EVENT_ACTION_DOWN - pointer_id: " << pointer_id;
         platform->pointer_pos_[pointer_id] = pos[pointer_id];
         platform->pointer_down_[pointer_id] = true;
-        input_event =
-            std::make_unique<InputEvent>(InputEvent::kDragStart, pointer_id,
-                                         pos[pointer_id] * Vector2f(1, -1));
+        input_event = std::make_unique<InputEvent>(InputEvent::kDragStart,
+                                                   pointer_id, pos[pointer_id]);
         break;
 
       case AMOTION_EVENT_ACTION_UP:
       case AMOTION_EVENT_ACTION_POINTER_UP:
-        // DLOG << "AMOTION_EVENT_ACTION_UP -   pointer_id: " << pointer_id;
         platform->pointer_pos_[pointer_id] = pos[pointer_id];
         platform->pointer_down_[pointer_id] = false;
-        input_event =
-            std::make_unique<InputEvent>(InputEvent::kDragEnd, pointer_id,
-                                         pos[pointer_id] * Vector2f(1, -1));
+        input_event = std::make_unique<InputEvent>(InputEvent::kDragEnd,
+                                                   pointer_id, pos[pointer_id]);
         break;
 
       case AMOTION_EVENT_ACTION_MOVE:
         if (platform->pointer_down_[0] && pos[0] != platform->pointer_pos_[0]) {
           platform->pointer_pos_[0] = pos[0];
-          input_event = std::make_unique<InputEvent>(InputEvent::kDrag, 0,
-                                                     pos[0] * Vector2f(1, -1));
+          input_event =
+              std::make_unique<InputEvent>(InputEvent::kDrag, 0, pos[0]);
         }
         if (platform->pointer_down_[1] && pos[1] != platform->pointer_pos_[1]) {
           platform->pointer_pos_[1] = pos[1];
-          input_event = std::make_unique<InputEvent>(InputEvent::kDrag, 1,
-                                                     pos[1] * Vector2f(1, -1));
+          input_event =
+              std::make_unique<InputEvent>(InputEvent::kDrag, 1, pos[1]);
         }
         break;
 
@@ -276,7 +273,7 @@ int32_t Platform::HandleInput(android_app* app, AInputEvent* event) {
     }
 
     if (input_event) {
-      platform->engine_->AddInputEvent(std::move(input_event));
+      platform->observer_->AddInputEvent(std::move(input_event));
       return 1;
     }
   }
@@ -295,30 +292,23 @@ void Platform::HandleCmd(android_app* app, int32_t cmd) {
       DLOG << "APP_CMD_INIT_WINDOW";
       if (app->window != NULL) {
         platform->SetFrameRate(60);
-        bool res = platform->renderer_->Initialize(app->window);
-        CHECK(res) << "Failed to initialize "
-                   << platform->renderer_->GetDebugName() << " renderer.";
+        if (platform->observer_)
+          platform->observer_->OnWindowCreated();
       }
       break;
 
     case APP_CMD_TERM_WINDOW:
       DLOG << "APP_CMD_TERM_WINDOW";
-      platform->renderer_->Shutdown();
+      if (platform->observer_)
+        platform->observer_->OnWindowDestroyed();
       break;
 
     case APP_CMD_CONFIG_CHANGED:
       DLOG << "APP_CMD_CONFIG_CHANGED";
-      if (platform->app_->window != NULL) {
-        int width = platform->renderer_->screen_width();
-        int height = platform->renderer_->screen_height();
-        if (width != ANativeWindow_getWidth(app->window) ||
-            height != ANativeWindow_getHeight(app->window)) {
-          platform->renderer_->Shutdown();
-          bool res = platform->renderer_->Initialize(platform->app_->window);
-          CHECK(res) << "Failed to initialize "
-                     << platform->renderer_->GetDebugName() << " renderer.";
-        }
-      }
+      if (platform->app_->window != NULL && platform->observer_)
+        platform->observer_->OnWindowResized(
+            ANativeWindow_getWidth(app->window),
+            ANativeWindow_getHeight(app->window));
       break;
 
     case APP_CMD_STOP:
@@ -327,18 +317,18 @@ void Platform::HandleCmd(android_app* app, int32_t cmd) {
 
     case APP_CMD_GAINED_FOCUS:
       DLOG << "APP_CMD_GAINED_FOCUS";
-      platform->timer_.Reset();
+      // platform->timer_.Reset();
       platform->has_focus_ = true;
-      if (platform->engine_)
-        platform->engine_->GainedFocus(g_showing_interstitial_ad);
+      if (platform->observer_)
+        platform->observer_->GainedFocus(g_showing_interstitial_ad);
       g_showing_interstitial_ad = false;
       break;
 
     case APP_CMD_LOST_FOCUS:
       DLOG << "APP_CMD_LOST_FOCUS";
       platform->has_focus_ = false;
-      if (platform->engine_)
-        platform->engine_->LostFocus();
+      if (platform->observer_)
+        platform->observer_->LostFocus();
       break;
 
     case APP_CMD_LOW_MEMORY:
@@ -347,11 +337,10 @@ void Platform::HandleCmd(android_app* app, int32_t cmd) {
   }
 }
 
-void Platform::Initialize(android_app* app) {
-  Platform::InitializeCommon();
+Platform::Platform(android_app* app) {
+  LOG << "Initializing platform.";
 
   app_ = app;
-
   mobile_device_ = true;
 
   root_path_ = ::GetApkPath(app->activity);
@@ -385,8 +374,8 @@ void Platform::Initialize(android_app* app) {
   Update();
 }
 
-void Platform::Shutdown() {
-  Platform::ShutdownCommon();
+Platform::~Platform() {
+  LOG << "Shutting down platform.";
 }
 
 void Platform::Update() {
@@ -439,12 +428,14 @@ void Platform::SetFrameRate(float frame_rate) {
   }
 }
 
+ANativeWindow* Platform::GetWindow() {
+  return app_->window;
+}
+
 }  // namespace eng
 
 void android_main(android_app* app) {
-  eng::Platform platform;
-  platform.Initialize(app);
-  platform.RunMainLoop();
-  platform.Shutdown();
+  eng::Platform platform(app);
+  eng::KaliberMain(&platform);
   _exit(0);
 }

src/engine/platform/platform_linux.cc

@@ -1,18 +1,20 @@
 #include "engine/platform/platform.h"
 
+#include <memory>
+
 #include "base/log.h"
-#include "base/task_runner.h"
 #include "base/vecmath.h"
-#include "engine/engine.h"
 #include "engine/input_event.h"
-#include "engine/renderer/renderer.h"
+#include "engine/platform/platform_observer.h"
 
 using namespace base;
 
 namespace eng {
 
-void Platform::Initialize() {
-  Platform::InitializeCommon();
+void KaliberMain(Platform* platform);
+
+Platform::Platform() {
+  LOG << "Initializing platform.";
 
   root_path_ = "../../";
   LOG << "Root path: " << root_path_.c_str();
@@ -26,10 +28,6 @@ void Platform::Initialize() {
   bool res = CreateWindow(800, 1205);
   CHECK(res) << "Failed to create window.";
 
-  res = renderer_->Initialize(display_, window_);
-  CHECK(res) << "Failed to initialize " << renderer_->GetDebugName()
-             << " renderer.";
-
   XSelectInput(display_, window_,
                KeyPressMask | Button1MotionMask | ButtonPressMask |
                    ButtonReleaseMask | FocusChangeMask);
@@ -37,9 +35,8 @@ void Platform::Initialize() {
   XSetWMProtocols(display_, window_, &WM_DELETE_WINDOW, 1);
 }
 
-void Platform::Shutdown() {
-  Platform::ShutdownCommon();
-
+Platform::~Platform() {
+  LOG << "Shutting down platform.";
   DestroyWindow();
 }
 
@@ -52,47 +49,41 @@ void Platform::Update() {
         KeySym key = XLookupKeysym(&e.xkey, 0);
         auto input_event =
             std::make_unique<InputEvent>(InputEvent::kKeyPress, (char)key);
-        engine_->AddInputEvent(std::move(input_event));
+        observer_->AddInputEvent(std::move(input_event));
         // TODO: e.xkey.state & (ShiftMask | ControlMask | Mod1Mask | Mod4Mask))
         break;
       }
       case MotionNotify: {
         Vector2f v(e.xmotion.x, e.xmotion.y);
-        v = engine_->ToPosition(v);
-        // DLOG << "drag: " << v;
-        auto input_event = std::make_unique<InputEvent>(InputEvent::kDrag, 0,
-                                                        v * Vector2f(1, -1));
-        engine_->AddInputEvent(std::move(input_event));
+        auto input_event =
+            std::make_unique<InputEvent>(InputEvent::kDrag, 0, v);
+        observer_->AddInputEvent(std::move(input_event));
         break;
       }
       case ButtonPress: {
         if (e.xbutton.button == 1) {
           Vector2f v(e.xbutton.x, e.xbutton.y);
-          v = engine_->ToPosition(v);
-          // DLOG << "drag-start: " << v;
-          auto input_event = std::make_unique<InputEvent>(
-              InputEvent::kDragStart, 0, v * Vector2f(1, -1));
-          engine_->AddInputEvent(std::move(input_event));
+          auto input_event =
+              std::make_unique<InputEvent>(InputEvent::kDragStart, 0, v);
+          observer_->AddInputEvent(std::move(input_event));
         }
         break;
       }
       case ButtonRelease: {
         if (e.xbutton.button == 1) {
           Vector2f v(e.xbutton.x, e.xbutton.y);
-          v = engine_->ToPosition(v);
-          // DLOG << "drag-end!";
-          auto input_event = std::make_unique<InputEvent>(
-              InputEvent::kDragEnd, 0, v * Vector2f(1, -1));
-          engine_->AddInputEvent(std::move(input_event));
+          auto input_event =
+              std::make_unique<InputEvent>(InputEvent::kDragEnd, 0, v);
+          observer_->AddInputEvent(std::move(input_event));
         }
         break;
       }
       case FocusOut: {
-        engine_->LostFocus();
+        observer_->LostFocus();
         break;
       }
       case FocusIn: {
-        engine_->GainedFocus(false);
+        observer_->GainedFocus(false);
         break;
       }
       case ClientMessage: {
@@ -127,7 +118,7 @@ bool Platform::CreateWindow(int width, int height) {
 
   Window root_window = DefaultRootWindow(display_);
 
-  XVisualInfo* visual_info = renderer_->GetXVisualInfo(display_);
+  XVisualInfo* visual_info = GetXVisualInfo(display_);
   if (!visual_info) {
     LOG << "No appropriate visual found.";
     return false;
@@ -151,18 +142,35 @@ bool Platform::CreateWindow(int width, int height) {
 void Platform::DestroyWindow() {
   if (display_) {
     XDestroyWindow(display_, window_);
+#if 0  // TODO: Figure out why XCloseDisplay is crashing
     XCloseDisplay(display_);
+#endif
     display_ = nullptr;
     window_ = 0;
   }
 }
 
+Display* Platform::GetDisplay() {
+  return display_;
+}
+
+Window Platform::GetWindow() {
+  return window_;
+}
+
+XVisualInfo* Platform::GetXVisualInfo(Display* display) {
+  long visual_mask = VisualScreenMask;
+  int num_visuals;
+  XVisualInfo visual_info_template = {};
+  visual_info_template.screen = DefaultScreen(display);
+  return XGetVisualInfo(display, visual_mask, &visual_info_template,
+                        &num_visuals);
+}
+
 }  // namespace eng
 
 int main(int argc, char** argv) {
   eng::Platform platform;
-  platform.Initialize();
-  platform.RunMainLoop();
-  platform.Shutdown();
+  eng::KaliberMain(&platform);
   return 0;
 }

src/engine/platform/platform_observer.h

@@ -0,0 +1,23 @@
+#ifndef ENGINE_PLATFORM_PLATFORM_OBSERVER_H
+#define ENGINE_PLATFORM_PLATFORM_OBSERVER_H
+
+namespace eng {
+
+class InputEvent;
+
+class PlatformObserver {
+ public:
+  PlatformObserver() = default;
+  virtual ~PlatformObserver() = default;
+
+  virtual void OnWindowCreated() = 0;
+  virtual void OnWindowDestroyed() = 0;
+  virtual void OnWindowResized(int width, int height) = 0;
+  virtual void LostFocus() = 0;
+  virtual void GainedFocus(bool from_interstitial_ad) = 0;
+  virtual void AddInputEvent(std::unique_ptr<InputEvent> event) = 0;
+};
+
+}  // namespace eng
+
+#endif  // ENGINE_PLATFORM_PLATFORM_OBSERVER_H

src/engine/renderer/opengl/renderer_opengl.cc

@@ -40,13 +40,35 @@ const std::string kAttributeNames[eng::kAttribType_Max] = {
 namespace eng {
 
 #ifdef THREADED_RENDERING
-RendererOpenGL::RendererOpenGL()
-    : main_thread_task_runner_(TaskRunner::GetThreadLocalTaskRunner()) {}
+RendererOpenGL::RendererOpenGL(base::Closure context_lost_cb)
+    : Renderer(context_lost_cb),
+      main_thread_task_runner_(TaskRunner::GetThreadLocalTaskRunner()) {}
 #else
 RendererOpenGL::RendererOpenGL() = default;
 #endif  // THREADED_RENDERING
 
-RendererOpenGL::~RendererOpenGL() = default;
+RendererOpenGL::~RendererOpenGL() {
+  Shutdown();
+  OnDestroy();
+}
+
+void RendererOpenGL::Shutdown() {
+#ifdef THREADED_RENDERING
+  if (terminate_render_thread_)
+    return;
+
+  LOG << "Shutting down renderer.";
+  {
+    std::unique_lock<std::mutex> scoped_lock(mutex_);
+    terminate_render_thread_ = true;
+  }
+  cv_.notify_one();
+  LOG << "Terminating render thread";
+  render_thread_.join();
+#else
+  ShutdownInternal();
+#endif  // THREADED_RENDERING
+}
 
 uint64_t RendererOpenGL::CreateGeometry(std::unique_ptr<Mesh> mesh) {
   auto cmd = std::make_unique<CmdCreateGeometry>();
@@ -348,24 +370,6 @@ bool RendererOpenGL::StartRenderThread() {
 #endif  // THREADED_RENDERING
 }
 
-void RendererOpenGL::TerminateRenderThread() {
-#ifdef THREADED_RENDERING
-  if (terminate_render_thread_)
-    return;
-
-  // Notify worker thread and wait for it to terminate.
-  {
-    std::unique_lock<std::mutex> scoped_lock(mutex_);
-    terminate_render_thread_ = true;
-  }
-  cv_.notify_one();
-  LOG << "Terminating render thread";
-  render_thread_.join();
-#else
-  ShutdownInternal();
-#endif  // THREADED_RENDERING
-}
-
 #ifdef THREADED_RENDERING
 
 void RendererOpenGL::RenderThreadMain(std::promise<bool> promise) {

src/engine/renderer/opengl/renderer_opengl.h

@@ -37,15 +37,10 @@ struct RenderCommand;
 
 class RendererOpenGL final : public Renderer {
  public:
-  RendererOpenGL();
+  RendererOpenGL(base::Closure context_lost_cb);
   ~RendererOpenGL() final;
 
-#if defined(__ANDROID__)
-  bool Initialize(ANativeWindow* window) final;
-#elif defined(__linux__)
-  bool Initialize(Display* display, Window window) final;
-#endif
-
+  virtual bool Initialize(Platform* platform) final;
   void Shutdown() final;
 
   uint64_t CreateGeometry(std::unique_ptr<Mesh> mesh) final;
@@ -89,10 +84,6 @@ class RendererOpenGL final : public Renderer {
 
   const char* GetDebugName() final { return "OpenGL"; }
 
-#if defined(__linux__) && !defined(__ANDROID__)
-  XVisualInfo* GetXVisualInfo(Display* display) final;
-#endif
-
  private:
   struct GeometryOpenGL {
     struct Element {
@@ -165,12 +156,13 @@ class RendererOpenGL final : public Renderer {
   bool InitCommon();
   void ShutdownInternal();
 
+  void OnDestroy();
+
   void ContextLost();
 
   void DestroyAllResources();
 
   bool StartRenderThread();
-  void TerminateRenderThread();
 
 #ifdef THREADED_RENDERING
   void RenderThreadMain(std::promise<bool> promise);

src/engine/renderer/opengl/renderer_opengl_android.cc

@@ -3,20 +3,20 @@
 #include <android/native_window.h>
 
 #include "base/log.h"
+#include "engine/platform/platform.h"
 #include "third_party/android/GLContext.h"
 
 namespace eng {
 
-bool RendererOpenGL::Initialize(ANativeWindow* window) {
+bool RendererOpenGL::Initialize(Platform* platform) {
   LOG << "Initializing renderer.";
 
-  window_ = window;
+  window_ = platform->GetWindow();
   return StartRenderThread();
 }
 
-void RendererOpenGL::Shutdown() {
-  LOG << "Shutting down renderer.";
-  TerminateRenderThread();
+void RendererOpenGL::OnDestroy() {
+  ndk_helper::GLContext::GetInstance()->Invalidate();
 }
 
 bool RendererOpenGL::InitInternal() {

src/engine/renderer/opengl/renderer_opengl_linux.cc

@@ -1,14 +1,15 @@
 #include "engine/renderer/opengl/renderer_opengl.h"
 
 #include "base/log.h"
+#include "engine/platform/platform.h"
 
 namespace eng {
 
-bool RendererOpenGL::Initialize(Display* display, Window window) {
+bool RendererOpenGL::Initialize(Platform* platform) {
   LOG << "Initializing renderer.";
 
-  display_ = display;
-  window_ = window;
+  display_ = platform->GetDisplay();
+  window_ = platform->GetWindow();
 
   XWindowAttributes xwa;
   XGetWindowAttributes(display_, window_, &xwa);
@@ -18,16 +19,13 @@ bool RendererOpenGL::Initialize(Display* display, Window window) {
   return StartRenderThread();
 }
 
-void RendererOpenGL::Shutdown() {
-  LOG << "Shutting down renderer.";
-
-  TerminateRenderThread();
-}
+void RendererOpenGL::OnDestroy() {}
 
 bool RendererOpenGL::InitInternal() {
-  // Create the OpenGL context.
-  glx_context_ =
-      glXCreateContext(display_, GetXVisualInfo(display_), NULL, GL_TRUE);
+  GLint glx_attributes[] = {GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER,
+                            None};
+  XVisualInfo* visual_info = glXChooseVisual(display_, 0, glx_attributes);
+  glx_context_ = glXCreateContext(display_, visual_info, NULL, GL_TRUE);
   if (!glx_context_) {
     LOG << "Couldn't create the glx context.";
     return false;
@@ -63,11 +61,4 @@ void RendererOpenGL::HandleCmdPresent(RenderCommand* cmd) {
   }
 }
 
-XVisualInfo* RendererOpenGL::GetXVisualInfo(Display* display) {
-  // Look for the right visual to set up the OpenGL context.
-  GLint glx_attributes[] = {GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER,
-                            None};
-  return glXChooseVisual(display, 0, glx_attributes);
-}
-
 }  // namespace eng

src/engine/renderer/render_resource.h

@@ -15,6 +15,11 @@ class RenderResource {
 
   uint64_t resource_id() { return resource_id_; }
 
+  void SetRenderer(Renderer* renderer) {
+    renderer_ = renderer;
+    resource_id_ = 0;
+  }
+
  protected:
   uint64_t resource_id_ = 0;
   Renderer* renderer_ = nullptr;

src/engine/renderer/renderer.h

@@ -4,40 +4,26 @@
 #include <memory>
 #include <string>
 
-#if defined(__linux__) && !defined(__ANDROID__)
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
-#endif
-
 #include "base/closure.h"
 #include "base/vecmath.h"
 #include "engine/renderer/renderer_types.h"
 
-#if defined(__ANDROID__)
-struct ANativeWindow;
-#endif
-
 namespace eng {
 
 class Image;
 class ShaderSource;
 class Mesh;
+class Platform;
 
 class Renderer {
  public:
   const unsigned kInvalidId = 0;
 
-  Renderer() = default;
+  Renderer(base::Closure context_lost_cb)
+      : context_lost_cb_{std::move(context_lost_cb)} {}
   virtual ~Renderer() = default;
 
-  void SetContextLostCB(base::Closure cb) { context_lost_cb_ = std::move(cb); }
-
-#if defined(__ANDROID__)
-  virtual bool Initialize(ANativeWindow* window) = 0;
-#elif defined(__linux__)
-  virtual bool Initialize(Display* display, Window window) = 0;
-#endif
-
+  virtual bool Initialize(Platform* platform) = 0;
   virtual void Shutdown() = 0;
 
   virtual uint64_t CreateGeometry(std::unique_ptr<Mesh> mesh) = 0;
@@ -94,10 +80,6 @@ class Renderer {
 
   virtual const char* GetDebugName() = 0;
 
-#if defined(__linux__) && !defined(__ANDROID__)
-  virtual XVisualInfo* GetXVisualInfo(Display* display) = 0;
-#endif
-
  protected:
   struct TextureCompression {
     unsigned etc1 : 1;

src/engine/renderer/vulkan/renderer_vulkan.cc

@@ -370,10 +370,12 @@ std::pair<int, int> GetNumBlocksForImageFormat(VkFormat format,
 
 namespace eng {
 
-RendererVulkan::RendererVulkan(std::unique_ptr<VulkanContext> context)
-    : context_{std::move(context)} {}
+RendererVulkan::RendererVulkan(base::Closure context_lost_cb)
+    : Renderer(context_lost_cb) {}
 
-RendererVulkan::~RendererVulkan() = default;
+RendererVulkan::~RendererVulkan() {
+  Shutdown();
+}
 
 uint64_t RendererVulkan::CreateGeometry(std::unique_ptr<Mesh> mesh) {
   auto& geometry = geometries_[++last_resource_id_] = {};
@@ -707,7 +709,7 @@ uint64_t RendererVulkan::CreateShader(
   pipeline_info.pDepthStencilState = &depth_stencil;
   pipeline_info.pDynamicState = &dynamic_state_create_info;
   pipeline_info.layout = shader.pipeline_layout;
-  pipeline_info.renderPass = context_->GetRenderPass();
+  pipeline_info.renderPass = context_.GetRenderPass();
   pipeline_info.subpass = 0;
   pipeline_info.basePipelineHandle = VK_NULL_HANDLE;
 
@@ -828,7 +830,7 @@ void RendererVulkan::UploadUniforms(uint64_t resource_id) {
 }
 
 void RendererVulkan::PrepareForDrawing() {
-  context_->PrepareBuffers();
+  context_.PrepareBuffers();
   DrawListBegin();
 }
 
@@ -840,20 +842,20 @@ void RendererVulkan::Present() {
 bool RendererVulkan::InitializeInternal() {
   glslang::InitializeProcess();
 
-  device_ = context_->GetDevice();
+  device_ = context_.GetDevice();
 
   // Allocate one extra frame to ensure it's unused at any time without having
   // to use a fence.
-  int frame_count = context_->GetSwapchainImageCount() + 1;
+  int frame_count = context_.GetSwapchainImageCount() + 1;
   frames_.resize(frame_count);
   frames_drawn_ = frame_count;
 
   // Initialize allocator
   VmaAllocatorCreateInfo allocator_info;
   memset(&allocator_info, 0, sizeof(VmaAllocatorCreateInfo));
-  allocator_info.physicalDevice = context_->GetPhysicalDevice();
+  allocator_info.physicalDevice = context_.GetPhysicalDevice();
   allocator_info.device = device_;
-  allocator_info.instance = context_->GetInstance();
+  allocator_info.instance = context_.GetInstance();
   vmaCreateAllocator(&allocator_info, &allocator_);
 
   for (size_t i = 0; i < frames_.size(); i++) {
@@ -861,7 +863,7 @@ bool RendererVulkan::InitializeInternal() {
     VkCommandPoolCreateInfo cmd_pool_info;
     cmd_pool_info.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
     cmd_pool_info.pNext = nullptr;
-    cmd_pool_info.queueFamilyIndex = context_->GetGraphicsQueue();
+    cmd_pool_info.queueFamilyIndex = context_.GetGraphicsQueue();
     cmd_pool_info.flags = 0;
 
     VkResult err = vkCreateCommandPool(device_, &cmd_pool_info, nullptr,
@@ -1014,8 +1016,8 @@ void RendererVulkan::Shutdown() {
   current_staging_buffer_ = 0;
   staging_buffer_used_ = false;
 
-  context_->DestroyWindow();
-  context_->Shutdown();
+  context_.DestroyWindow();
+  context_.Shutdown();
 
   glslang::FinalizeProcess();
 }
@@ -1023,8 +1025,8 @@ void RendererVulkan::Shutdown() {
 void RendererVulkan::BeginFrame() {
   FreePendingResources(current_frame_);
 
-  context_->AppendCommandBuffer(frames_[current_frame_].setup_command_buffer);
-  context_->AppendCommandBuffer(frames_[current_frame_].draw_command_buffer);
+  context_.AppendCommandBuffer(frames_[current_frame_].setup_command_buffer);
+  context_.AppendCommandBuffer(frames_[current_frame_].draw_command_buffer);
 
   vkResetCommandPool(device_, frames_[current_frame_].setup_command_pool, 0);
   vkResetCommandPool(device_, frames_[current_frame_].draw_command_pool, 0);
@@ -1063,7 +1065,7 @@ void RendererVulkan::BeginFrame() {
 void RendererVulkan::FlushSetupBuffer() {
   vkEndCommandBuffer(frames_[current_frame_].setup_command_buffer);
 
-  context_->Flush(false);
+  context_.Flush(false);
 
   vkResetCommandPool(device_, frames_[current_frame_].setup_command_pool, 0);
 
@@ -1079,7 +1081,7 @@ void RendererVulkan::FlushSetupBuffer() {
     DLOG << "vkBeginCommandBuffer failed with error " << string_VkResult(err);
     return;
   }
-  context_->AppendCommandBuffer(frames_[current_frame_].setup_command_buffer,
+  context_.AppendCommandBuffer(frames_[current_frame_].setup_command_buffer,
                                true);
 }
 
@@ -1907,8 +1909,8 @@ void RendererVulkan::DrawListBegin() {
   VkRenderPassBeginInfo render_pass_begin;
   render_pass_begin.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
   render_pass_begin.pNext = nullptr;
-  render_pass_begin.renderPass = context_->GetRenderPass();
-  render_pass_begin.framebuffer = context_->GetFramebuffer();
+  render_pass_begin.renderPass = context_.GetRenderPass();
+  render_pass_begin.framebuffer = context_.GetFramebuffer();
 
   render_pass_begin.renderArea.extent.width = screen_width_;
   render_pass_begin.renderArea.extent.height = screen_height_;
@@ -1974,7 +1976,7 @@ void RendererVulkan::SwapBuffers() {
   vkEndCommandBuffer(frames_[current_frame_].setup_command_buffer);
   vkEndCommandBuffer(frames_[current_frame_].draw_command_buffer);
 
-  context_->SwapBuffers();
+  context_.SwapBuffers();
   current_frame_ = (current_frame_ + 1) % frames_.size();
 
   active_pipeline_ = VK_NULL_HANDLE;
@@ -2033,13 +2035,13 @@ bool RendererVulkan::SetUniformInternal(ShaderVulkan& shader,
 
 bool RendererVulkan::IsFormatSupported(VkFormat format) {
   VkFormatProperties properties;
-  vkGetPhysicalDeviceFormatProperties(context_->GetPhysicalDevice(), format,
+  vkGetPhysicalDeviceFormatProperties(context_.GetPhysicalDevice(), format,
                                       &properties);
   return properties.optimalTilingFeatures & VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT;
 }
 
 size_t RendererVulkan::GetAndResetFPS() {
-  return context_->GetAndResetFPS();
+  return context_.GetAndResetFPS();
 }
 
 void RendererVulkan::DestroyAllResources() {

src/engine/renderer/vulkan/renderer_vulkan.h

@@ -18,19 +18,12 @@
 
 namespace eng {
 
-class Image;
-
 class RendererVulkan final : public Renderer {
  public:
-  RendererVulkan(std::unique_ptr<VulkanContext> context);
+  RendererVulkan(base::Closure context_lost_cb);
   ~RendererVulkan() final;
 
-#if defined(__ANDROID__)
-  bool Initialize(ANativeWindow* window) final;
-#elif defined(__linux__)
-  bool Initialize(Display* display, Window window) final;
-#endif
-
+  virtual bool Initialize(Platform* platform) final;
   void Shutdown() final;
 
   uint64_t CreateGeometry(std::unique_ptr<Mesh> mesh) final;
@@ -74,10 +67,6 @@ class RendererVulkan final : public Renderer {
 
   const char* GetDebugName() final { return "Vulkan"; }
 
-#if defined(__linux__) && !defined(__ANDROID__)
-  XVisualInfo* GetXVisualInfo(Display* display) final;
-#endif
-
  private:
   // VkBuffer or VkImage with allocator.
   template <typename T>
@@ -156,7 +145,7 @@ class RendererVulkan final : public Renderer {
 
   bool context_lost_ = false;
 
-  std::unique_ptr<VulkanContext> context_;
+  VulkanContext context_;
 
   VmaAllocator allocator_ = nullptr;
 

src/engine/renderer/vulkan/renderer_vulkan_android.cc

@@ -3,16 +3,22 @@
 #include <android/native_window.h>
 
 #include "base/log.h"
+#include "engine/platform/platform.h"
 
 namespace eng {
 
-bool RendererVulkan::Initialize(ANativeWindow* window) {
+bool RendererVulkan::Initialize(Platform* platform) {
   LOG << "Initializing renderer.";
 
-  screen_width_ = ANativeWindow_getWidth(window);
-  screen_height_ = ANativeWindow_getHeight(window);
+  screen_width_ = ANativeWindow_getWidth(platform->GetWindow());
+  screen_height_ = ANativeWindow_getHeight(platform->GetWindow());
 
-  if (!context_->CreateWindow(window, screen_width_, screen_height_)) {
+  if (!context_.Initialize()) {
+    LOG << "Failed to initialize Vulkan context.";
+    return false;
+  }
+  if (!context_.CreateWindow(platform->GetWindow(), screen_width_,
+                             screen_height_)) {
     LOG << "Vulkan context failed to create window.";
     return false;
   }

src/engine/renderer/vulkan/renderer_vulkan_linux.cc

@@ -1,18 +1,24 @@
 #include "engine/renderer/vulkan/renderer_vulkan.h"
 
 #include "base/log.h"
+#include "engine/platform/platform.h"
 
 namespace eng {
 
-bool RendererVulkan::Initialize(Display* display, Window window) {
+bool RendererVulkan::Initialize(Platform* platform) {
   LOG << "Initializing renderer.";
 
   XWindowAttributes xwa;
-  XGetWindowAttributes(display, window, &xwa);
+  XGetWindowAttributes(platform->GetDisplay(), platform->GetWindow(), &xwa);
   screen_width_ = xwa.width;
   screen_height_ = xwa.height;
 
-  if (!context_->CreateWindow(display, window, screen_width_, screen_height_)) {
+  if (!context_.Initialize()) {
+    LOG << "Failed to initialize Vulkan context.";
+    return false;
+  }
+  if (!context_.CreateWindow(platform->GetDisplay(), platform->GetWindow(),
+                             screen_width_, screen_height_)) {
     LOG << "Vulkan context failed to create window.";
     return false;
   }
@@ -20,13 +26,4 @@ bool RendererVulkan::Initialize(Display* display, Window window) {
   return InitializeInternal();
 }
 
-XVisualInfo* RendererVulkan::GetXVisualInfo(Display* display) {
-  long visual_mask = VisualScreenMask;
-  int num_visuals;
-  XVisualInfo visual_info_template = {};
-  visual_info_template.screen = DefaultScreen(display);
-  return XGetVisualInfo(display, visual_mask, &visual_info_template,
-                        &num_visuals);
-}
-
 }  // namespace eng

src/engine/renderer/vulkan/vulkan_context.cc

@@ -35,9 +35,11 @@ VulkanContext::~VulkanContext() {
 }
 
 bool VulkanContext::Initialize() {
-  if (volkInitialize() != VK_SUCCESS) {
+  if (instance_ != VK_NULL_HANDLE)
+    return true;
+
+  if (volkInitialize() != VK_SUCCESS)
     return false;
-  }
 
   if (!CreatePhysicalDevice())
     return false;