Rework FlushSync to return early if commands have been processed since the last update

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 <cassert>
-#include "gpu/demos/framework/demo_factory.h"
-
-using gpu::demos::Plugin;
-
-namespace {
-const int32 kCommandBufferSize = 1024 * 1024;
-NPExtensions* g_extensions = NULL;
-
-// Plugin class functions.
-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;
-}
-
-void PluginInvalidate(NPObject* obj) {
-}
-
-bool PluginHasMethod(NPObject* obj, NPIdentifier name) {
-  return false;
-}
-
-bool PluginInvoke(NPObject* header,
-                  NPIdentifier name,
-                  const NPVariant* args, uint32 arg_count,
-                  NPVariant* result) {
-  return false;
-}
-
-bool PluginInvokeDefault(NPObject* obj,
-                         const NPVariant* args, uint32 arg_count,
-                         NPVariant* result) {
-  VOID_TO_NPVARIANT(*result);
-  return true;
-}
-
-bool PluginHasProperty(NPObject* obj, NPIdentifier name) {
-  return false;
-}
-
-bool PluginGetProperty(NPObject* obj,
-                       NPIdentifier name,
-                       NPVariant* result) {
-  return false;
-}
-
-bool PluginSetProperty(NPObject* obj,
-                       NPIdentifier name,
-                       const NPVariant* variant) {
-  return false;
-}
-
-NPClass plugin_class = {
-  NP_CLASS_STRUCT_VERSION,
-  PluginAllocate,
-  PluginDeallocate,
-  PluginInvalidate,
-  PluginHasMethod,
-  PluginInvoke,
-  PluginInvokeDefault,
-  PluginHasProperty,
-  PluginGetProperty,
-  PluginSetProperty,
-};
-
-void TickCallback(void* data) {
-  reinterpret_cast<gpu::demos::Plugin*>(data)->Tick();
-}
-
-void RepaintCallback(NPP npp, NPDeviceContext3D* /* context */) {
-  Plugin* plugin = static_cast<Plugin*>(npp->pdata);
-  plugin->Paint();
-}
-}
-
-namespace gpu {
-namespace demos {
-
-NPNetscapeFuncs* g_browser;
-
-Plugin::Plugin(NPP npp)
-  : npp_(npp),
-    device3d_(NULL),
-    pgl_context_(NULL),
-    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(PGL_NO_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);
-    assert(g_extensions);
-  }
-
-  device3d_ = g_extensions->acquireDevice(npp_, NPPepper3DDevice);
-  assert(device3d_);
-}
-
-void Plugin::SetWindow(const NPWindow& window) {
-  demo_->InitWindowSize(window.width, window.height);
-
-  if (!pgl_context_) {
-    if (!CreateContext())
-      return;
-
-    // Schedule first call to Tick.
-    if (demo_->IsAnimated())
-      g_browser->pluginthreadasynccall(npp_, TickCallback, this);
-  }
-}
-
-int32 Plugin::HandleEvent(const NPPepperEvent& event) {
-  return 0;
-}
-
-void Plugin::Tick() {
-  Paint();
-
-  // Schedule another call to Tick.
-  g_browser->pluginthreadasynccall(npp_, TickCallback, this);
-}
-
-void Plugin::Paint() {
-  if (!pglMakeCurrent(pgl_context_) && pglGetError() == PGL_CONTEXT_LOST) {
-    DestroyContext();
-    if (!CreateContext())
-      return;
-
-    pglMakeCurrent(pgl_context_);
-  }
-
-  demo_->Draw();
-  pglSwapBuffers();
-  pglMakeCurrent(PGL_NO_CONTEXT);
-}
-
-bool Plugin::CreateContext() {
-  assert(!pgl_context_);
-
-  // Initialize a 3D context.
-  NPDeviceContext3DConfig config;
-  config.commandBufferSize = kCommandBufferSize;
-  if (NPERR_NO_ERROR != device3d_->initializeContext(npp_,
-                                                     &config,
-                                                     &context3d_)) {
-    DestroyContext();
-    return false;
-  }
-
-  context3d_.repaintCallback = RepaintCallback;
-
-  // Create a PGL context.
-  pgl_context_ = pglCreateContext(npp_, device3d_, &context3d_);
-  if (!pgl_context_) {
-    DestroyContext();
-    return false;
-  }
-
-  // Initialize demo.
-  pglMakeCurrent(pgl_context_);
-  if (!demo_->InitGL()) {
-    DestroyContext();
-    return false;
-  }
-
-  pglMakeCurrent(PGL_NO_CONTEXT);
-
-  return true;
-}
-
-void Plugin::DestroyContext() {
-  if (pgl_context_) {
-    pglDestroyContext(pgl_context_);
-    pgl_context_ = NULL;
-  }
-
-  if (context3d_.commandBuffer) {
-    device3d_->destroyContext(npp_, &context3d_);
-    memset(&context3d_, 0, sizeof(context3d_));
-  }
-}
-
-}  // namespace demos
-}  // namespace gpu