PlatformObserver wip

src/engine/engine.cc

@@ -43,6 +43,7 @@ Engine::Engine(Platform* platform)
   DCHECK(!singleton);
   singleton = this;
 
+  platform_->SetObserver(this);
   renderer_->SetContextLostCB(std::bind(&Engine::ContextLost, this));
 
   stats_ = std::make_unique<ImageQuad>();
@@ -67,14 +68,7 @@ Engine& Engine::Get() {
 }
 
 bool Engine::Initialize() {
-  bool res;
-#if defined(__ANDROID__)
-  res = renderer_->Initialize(platform_->GetWindow());
-#elif defined(__linux__)
-  res = renderer_->Initialize(platform_->GetDisplay(), platform_->GetWindow());
-#endif
-  CHECK(res) << "Failed to initialize " << renderer_->GetDebugName()
-             << " renderer.";
+  InitializeRenderer();
 
   // Normalize viewport.
   if (GetScreenWidth() > GetScreenHeight()) {
@@ -507,6 +501,33 @@ bool Engine::IsMobile() const {
   return platform_->mobile_device();
 }
 
+void Engine::OnWindowCreated() {
+  InitializeRenderer();
+}
+
+void Engine::OnWindowDestroyed() {
+  renderer_->Shutdown();
+}
+
+void Engine::OnWindowResized(int width, int height) {
+  if (width != renderer_->screen_width() ||
+      height != renderer_->screen_height()) {
+    renderer_->Shutdown();
+    InitializeRenderer();
+  }
+}
+
+void Engine::InitializeRenderer() {
+  bool res;
+#if defined(__ANDROID__)
+  res = renderer_->Initialize(platform_->GetWindow());
+#elif defined(__linux__)
+  res = renderer_->Initialize(platform_->GetDisplay(), platform_->GetWindow());
+#endif
+  CHECK(res) << "Failed to initialize " << renderer_->GetDebugName()
+             << " renderer.";
+}
+
 void Engine::CreateTextureCompressors() {
   tex_comp_alpha_.reset();
   tex_comp_opaque_.reset();

src/engine/engine.h

@@ -10,6 +10,7 @@
 #include "base/random.h"
 #include "base/vecmath.h"
 #include "engine/persistent_data.h"
+#include "engine/platform/platform_observer.h"
 
 class TextureCompressor;
 
@@ -29,7 +30,7 @@ class Shader;
 class Texture;
 class Platform;
 
-class Engine {
+class Engine : public PlatformObserver {
  public:
   using CreateImageCB = std::function<std::unique_ptr<Image>()>;
 
@@ -220,6 +221,13 @@ class Engine {
 
   base::Randomf random_;
 
+  // PlatformObserver implementation
+  void OnWindowCreated() final;
+  void OnWindowDestroyed() final;
+  void OnWindowResized(int width, int height) final;
+
+  void InitializeRenderer();
+
   void CreateTextureCompressors();
 
   void ContextLost();

src/engine/platform/platform.h

@@ -25,6 +25,7 @@ struct ANativeWindow;
 namespace eng {
 
 class Engine;
+class PlatformObserver;
 
 class Platform {
  public:
@@ -43,6 +44,8 @@ class Platform {
 
   void Exit();
 
+  void SetObserver(PlatformObserver* observer) { observer_ = observer; }
+
   // Renderer* SwitchRenderer(bool vulkan);
 
   void Vibrate(int duration);
@@ -84,6 +87,8 @@ class Platform {
   bool has_focus_ = false;
   bool should_exit_ = false;
 
+  PlatformObserver* observer_ = nullptr;
+
   std::unique_ptr<Engine> engine_;
 
   base::ThreadPool thread_pool_;

src/engine/platform/platform_android.cc

@@ -9,6 +9,7 @@
 #include "base/task_runner.h"
 #include "engine/engine.h"
 #include "engine/input_event.h"
+#include "engine/platform/platform_observer.h"
 
 using namespace base;
 
@@ -294,30 +295,21 @@ void Platform::HandleCmd(android_app* app, int32_t cmd) {
       DLOG << "APP_CMD_INIT_WINDOW";
       if (app->window != NULL) {
         platform->SetFrameRate(60);
-        // bool res = platform->InitializeRenderer();
-        // CHECK(res) << "Failed to initialize "
-        //            << platform->renderer_->GetDebugName() << " renderer.";
+        platform->observer_->OnWindowCreated();
       }
       break;
 
     case APP_CMD_TERM_WINDOW:
       DLOG << "APP_CMD_TERM_WINDOW";
-      // platform->renderer_->Shutdown();
+      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->InitializeRenderer();
-      //     CHECK(res) << "Failed to initialize "
-      //                << platform->renderer_->GetDebugName() << " renderer.";
-      //   }
-      // }
+      if (platform->app_->window != NULL)
+        platform->observer_->OnWindowResized(
+            ANativeWindow_getWidth(app->window),
+            ANativeWindow_getHeight(app->window));
       break;
 
     case APP_CMD_STOP:

src/engine/platform/platform_observer.h

@@ -0,0 +1,18 @@
+#ifndef ENGINE_PLATFORM_PLATFORM_OBSERVER_H
+#define ENGINE_PLATFORM_PLATFORM_OBSERVER_H
+
+namespace eng {
+
+class PlatformObserver {
+ public:
+  PlatformObserver() = default;
+  virtual ~PlatformObserver() = default;
+
+  virtual void OnWindowCreated() = 0;
+  virtual void OnWindowDestroyed() = 0;
+  virtual void OnWindowResized(int width, int height) = 0;
+};
+
+}  // namespace eng
+
+#endif  // ENGINE_PLATFORM_PLATFORM_OBSERVER_H