[GPU] GLES2 lost context recovery

gpu/demos/framework/plugin.cc

 // Copyright (c) 2010 The Chromium 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 "gpu/demos/framework/plugin.h"
 
 #include "base/logging.h"
 #include "gpu/demos/framework/demo_factory.h"
 
+using gpu::demos::Plugin;
+
 namespace {
 const int32 kCommandBufferSize = 1024 * 1024;
 NPExtensions* g_extensions = NULL;
 
 // Plugin class functions.
-using gpu::demos::Plugin;
 NPObject* PluginAllocate(NPP npp, NPClass* the_class) {
   Plugin* plugin = new Plugin(npp);
   return plugin;
 }
 
 void PluginDeallocate(NPObject* header) {
   Plugin* plugin = static_cast<Plugin*>(header);
   delete plugin;
 }
 
@@ skipping 64 matching lines @@
     demo_(CreateDemo()) {
   memset(&context3d_, 0, sizeof(context3d_));
 }
 
 Plugin::~Plugin() {
   // Destroy demo while GL context is current and before it is destroyed.
   pglMakeCurrent(pgl_context_);
   demo_.reset();
   pglMakeCurrent(NULL);
 
-  pglDestroyContext(pgl_context_);
+  DestroyContext();
 }
 
 NPClass* Plugin::GetPluginClass() {
   return &plugin_class;
 }
 
 void Plugin::New(NPMIMEType pluginType,
                  int16 argc, char* argn[], char* argv[]) {
   if (!g_extensions) {
     g_browser->getvalue(npp_, NPNVPepperExtensions, &g_extensions);
     CHECK(g_extensions);
   }
 
   device3d_ = g_extensions->acquireDevice(npp_, NPPepper3DDevice);
   CHECK(device3d_);
 }
 
 void Plugin::SetWindow(const NPWindow& window) {
+  demo_->InitWindowSize(window.width, window.height);
+
   if (!pgl_context_) {
-    // Initialize a 3D context.
-    NPDeviceContext3DConfig config;
-    config.commandBufferSize = kCommandBufferSize;
-    device3d_->initializeContext(npp_, &config, &context3d_);
-
-    // Create a PGL context.
-    pgl_context_ = pglCreateContext(npp_, device3d_, &context3d_);
-
-    // Initialize demo.
-    pglMakeCurrent(pgl_context_);
-    demo_->InitWindowSize(window.width, window.height);
-    CHECK(demo_->InitGL());
-    pglMakeCurrent(NULL);
+    CreateContext();
   }
 
   // Schedule the first call to Draw.
   g_browser->pluginthreadasynccall(npp_, PaintCallback, this);
 }
 
 void Plugin::Paint() {
-  // Render some stuff.
-  pglMakeCurrent(pgl_context_);
+  if (!pglMakeCurrent(pgl_context_) && pglGetError() == PGL_CONTEXT_LOST) {
+    DestroyContext();
+    CreateContext();
+    pglMakeCurrent(pgl_context_);
+  }
+
   demo_->Draw();
   pglSwapBuffers();
   pglMakeCurrent(NULL);
 
   // Schedule another call to Paint.
   g_browser->pluginthreadasynccall(npp_, PaintCallback, this);
 }
 
+void Plugin::CreateContext() {
+  DCHECK(!pgl_context_);
+
+  // Initialize a 3D context.
+  NPDeviceContext3DConfig config;
+  config.commandBufferSize = kCommandBufferSize;
+  device3d_->initializeContext(npp_, &config, &context3d_);
+
+  // Create a PGL context.
+  pgl_context_ = pglCreateContext(npp_, device3d_, &context3d_);
+
+  // Initialize demo.
+  pglMakeCurrent(pgl_context_);
+  CHECK(demo_->InitGL());
+  pglMakeCurrent(NULL);
+}
+
+void Plugin::DestroyContext() {
+  DCHECK(pgl_context_);
+
+  pglDestroyContext(pgl_context_);
+  pgl_context_ = NULL;
+
+  device3d_->destroyContext(npp_, &context3d_);
+}
+
 }  // namespace demos
 }  // namespace gpu