Android rayshader sample.

samples/android_sample/jni/dart_host.cc

+#include "jni/dart_host.h"
+
+#include <math.h>
+#include <unistd.h>
+
+#include "bin/eventhandler.h"
+#include "bin/isolate_data.h"
+#include "bin/log.h"
+#include "bin/platform.h"
+#include "bin/process.h"
+#include "vm/flags.h"
+
+DartHost::DartHost(Context *context)
+    : input_handler_(context->input_handler),
+      timer_(context->timer),
+      graphics_(context->graphics),
+      vm_glue_(context->vm_glue),
+      active_(false) {
+  Log::Print("Creating DartHost");
+}
+
+DartHost::~DartHost() {
+  Log::Print("Freeing DartHost");
+}
+
+int32_t DartHost::OnActivate() {
+  return Activate();
+}
+
+int32_t DartHost::Activate() {
+  if (!active_) {
+    Log::Print("Activating DartHost");
+    if (graphics_->Start() != 0) {
+      return -1;
+    }
+    if (input_handler_->Start() != 0) {
+      return -1;
+    }
+    timer_->reset();
+    Log::Print("Starting main isolate");
+    int result = vm_glue_->StartMainIsolate();
+    if (result != 0) {
+      Log::PrintErr("startMainIsolate returned %d", result);
+      return -1;
+    }
+    active_ = true;
+    vm_glue_->CallSetup();
+  }
+  return 0;
+}
+
+void DartHost::OnDeactivate() {
+  Deactivate();
+}
+
+void DartHost::Deactivate() {
+  if (active_) {
+    active_ = false;
+    vm_glue_->FinishMainIsolate();
+    Log::Print("Deactivating DartHost");
+    graphics_->Stop();
+  }
+}
+
+int32_t DartHost::OnStep() {
+  timer_->update();
+  vm_glue_->CallUpdate();
+  if (graphics_->Update() != 0) {
+    return -1;
+  }
+  return 0;
+}
+
+void DartHost::OnStart() {
+  Log::Print("Starting DartHost");
+}
+
+void DartHost::OnResume() {
+  Log::Print("Resuming DartHost");
+}
+
+void DartHost::OnPause() {
+  Log::Print("Pausing DartHost");
+}
+
+void DartHost::OnStop() {
+  Log::Print("Stopping DartHost");
+}
+
+void DartHost::OnDestroy() {
+  Log::Print("Destroying DartHost");
+}
+
+void DartHost::OnSaveState(void** data, size_t size) {
+  Log::Print("Saving DartHost state");
+}
+
+void DartHost::OnConfigurationChanged() {
+  Log::Print("DartHost config changed");
+}
+
+void DartHost::OnLowMemory() {
+  Log::Print("DartHost low on memory");
+}
+
+void DartHost::OnCreateWindow() {
+  Log::Print("DartHost creating window");
+}
+
+void DartHost::OnDestroyWindow() {
+  Log::Print("DartHost destroying window");
+}
+
+void DartHost::OnGainedFocus() {
+  Log::Print("DartHost gained focus");
+}
+
+void DartHost::OnLostFocus() {
+  Log::Print("DartHost lost focus");
+}
+
+void DartHost::Clear() {
+  memset(window_buffer_.bits, 0,
+         window_buffer_.stride * window_buffer_.height * sizeof(int32_t));
+}
+