Added an application framework for demos. This framework currently only supports stand-alone apps. It will be extended to support trusted pepper and untrusted nacl apps.

BUG=26099
Review URL: http://codereview.chromium.org/525083

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35758 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 275 insertions, 0 deletions

diff --git a/gpu/demos/app_framework/application.cc b/gpu/demos/app_framework/application.cc
new file mode 100644
index 0000000..0ae2cb9
--- /dev/null
+++ b/gpu/demos/app_framework/application.cc
@@ -0,0 +1,161 @@
+// Copyright (c) 2006-2009 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/app_framework/application.h"
+
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "gpu/command_buffer/client/gles2_lib.h"
+#include "gpu/command_buffer/service/command_buffer_service.h"
+#include "gpu/command_buffer/service/gpu_processor.h"
+
+using gpu::Buffer;
+using gpu::CommandBufferService;
+using gpu::GPUProcessor;
+using gpu::gles2::GLES2CmdHelper;
+using gpu::gles2::GLES2Implementation;
+
+// TODO(alokp): Implement it on mac and linux when gpu process is functional
+// on these OS'.
+#if defined(OS_WIN)
+namespace {
+static const int32 kCommandBufferSize = 1024 * 1024;
+static const int32 kTransferBufferSize = 512 * 1024;
+
+static LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg,
+                                   WPARAM w_param, LPARAM l_param) {
+  LRESULT result = 0;
+  switch (msg) {
+    case WM_CLOSE:
+      ::DestroyWindow(hwnd);
+      break;
+    case WM_DESTROY:
+      ::PostQuitMessage(0);
+      break;
+    case WM_PAINT: {
+      using gpu_demos::Application;
+      Application* app = reinterpret_cast<Application*>(
+          GetWindowLongPtr(hwnd, GWL_USERDATA));
+      if (app != NULL) app->OnPaint();
+      ::ValidateRect(hwnd, NULL);
+      break;
+    }
+    default:
+      result = ::DefWindowProc(hwnd, msg, w_param, l_param);
+      break;
+  }
+  return result;
+}
+}  // namespace.
+
+namespace gpu_demos {
+
+Application::Application()
+    : width_(512),
+      height_(512),
+      window_handle_(NULL) {
+}
+
+Application::~Application() {
+}
+
+void Application::MainLoop() {
+  MSG msg;
+  bool done = false;
+  while (!done) {
+    while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
+      if (msg.message == WM_QUIT) done = true;
+      TranslateMessage(&msg);
+      DispatchMessage(&msg);
+    }
+    // Message queue is empty and application has not quit yet - keep painting.
+    if (!done) SendMessage(window_handle_, WM_PAINT, 0, 0);
+  }
+}
+
+void Application::OnPaint() {
+  Draw();
+  gles2::GetGLContext()->SwapBuffers();
+}
+
+bool Application::InitRenderContext() {
+  window_handle_ = CreateNativeWindow();
+  if (window_handle_ == NULL) {
+    return false;
+  }
+
+  scoped_ptr<CommandBufferService> command_buffer(new CommandBufferService);
+  if (!command_buffer->Initialize(kCommandBufferSize)) {
+    return false;
+  }
+
+  scoped_refptr<GPUProcessor> gpu_processor(
+      new GPUProcessor(command_buffer.get()));
+  if (!gpu_processor->Initialize(window_handle_)) {
+    return false;
+  }
+
+  command_buffer->SetPutOffsetChangeCallback(
+      NewCallback(gpu_processor.get(), &GPUProcessor::ProcessCommands));
+
+  GLES2CmdHelper* helper = new GLES2CmdHelper(command_buffer.get());
+  if (!helper->Initialize()) {
+    // TODO(alokp): cleanup.
+    return false;
+  }
+
+  int32 transfer_buffer_id =
+      command_buffer->CreateTransferBuffer(kTransferBufferSize);
+  Buffer transfer_buffer =
+      command_buffer->GetTransferBuffer(transfer_buffer_id);
+  if (transfer_buffer.ptr == NULL) return false;
+
+  gles2::g_gl_impl = new GLES2Implementation(helper,
+                                             transfer_buffer.size,
+                                             transfer_buffer.ptr,
+                                             transfer_buffer_id);
+
+  return command_buffer.release() != NULL;
+}
+
+NativeWindowHandle Application::CreateNativeWindow() {
+  WNDCLASS wnd_class = {0};
+  HINSTANCE instance = GetModuleHandle(NULL);
+  wnd_class.style = CS_OWNDC;
+  wnd_class.lpfnWndProc = (WNDPROC)WindowProc;
+  wnd_class.hInstance = instance;
+  wnd_class.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
+  wnd_class.lpszClassName = L"opengles2.0";
+  if (!RegisterClass(&wnd_class)) return NULL;
+
+  DWORD wnd_style = WS_VISIBLE | WS_POPUP | WS_BORDER | WS_SYSMENU | WS_CAPTION;
+  RECT wnd_rect;
+  wnd_rect.left = 0;
+  wnd_rect.top = 0;
+  wnd_rect.right = width_;
+  wnd_rect.bottom = height_;
+  AdjustWindowRect(&wnd_rect, wnd_style, FALSE);
+
+  HWND hwnd = CreateWindow(
+      wnd_class.lpszClassName,
+      wnd_class.lpszClassName,
+      wnd_style,
+      0,
+      0,
+      wnd_rect.right - wnd_rect.left,
+      wnd_rect.bottom - wnd_rect.top,
+      NULL,
+      NULL,
+      instance,
+      NULL);
+  if (hwnd == NULL) return NULL;
+
+  ShowWindow(hwnd, SW_SHOWNORMAL);
+  // Set this to the GWL_USERDATA so that it is available to WindowProc.
+  SetWindowLongPtr(hwnd, GWL_USERDATA, (LONG_PTR)this);
+
+  return hwnd;
+}
+
+}  // namespace gpu_demos
+#endif  // defined(OS_WIN)
diff --git a/gpu/demos/app_framework/application.h b/gpu/demos/app_framework/application.h
new file mode 100644
index 0000000..f7d1a50
--- /dev/null
+++ b/gpu/demos/app_framework/application.h
@@ -0,0 +1,58 @@
+// Copyright (c) 2006-2009 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.
+
+// Base class for gles2 applications using command buffer.
+
+#ifndef GPU_DEMOS_APP_FRAMEWORK_APPLICATION_H_
+#define GPU_DEMOS_APP_FRAMEWORK_APPLICATION_H_
+
+#include "base/at_exit.h"
+#include "base/message_loop.h"
+
+#include "gpu/demos/app_framework/platform.h"
+
+namespace gpu_demos {
+
+// Acts as a base class for GLES2 applications using command buffer.
+// The derived calls needs to call InitRenderContext() to create a render
+// surface and initialize a rendering context. Currently it only creates
+// an on-screen window. It will be extended to support pepper/nacl plugin
+// when pepper 3D api is in place.
+class Application {
+ public:
+  Application();
+  virtual ~Application();
+
+  // Enters the event processing loop.
+  void MainLoop();
+  void OnPaint();
+
+ protected:
+  // Returns the width of rendering surface.
+  inline int width() const { return width_; }
+  // Returns the height of rendering surface.
+  inline int height() const { return height_; }
+
+  bool InitRenderContext();
+
+  virtual void Draw() = 0;
+
+ private:
+  // Creates a native on-screen window.
+  NativeWindowHandle CreateNativeWindow();
+
+  int width_;
+  int height_;
+  NativeWindowHandle window_handle_;
+
+  // The following two variables are just needed to satisfy
+  // the assumption that we are running inside a browser.
+  base::AtExitManager at_exit_manager_;
+  MessageLoopForUI message_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(Application);
+};
+
+}  // namespace gpu_demos
+#endif  // GPU_DEMOS_APP_FRAMEWORK_APPLICATION_H_
diff --git a/gpu/demos/app_framework/platform.h b/gpu/demos/app_framework/platform.h
new file mode 100644
index 0000000..602979e
--- /dev/null
+++ b/gpu/demos/app_framework/platform.h
@@ -0,0 +1,23 @@
+// Copyright (c) 2006-2009 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.
+
+// Platform-specific types and definitions for native widget handles.
+
+#ifndef GPU_DEMOS_APP_FRAMEWORK_PLATFORM_H_
+#define GPU_DEMOS_APP_FRAMEWORK_PLATFORM_H_
+
+#ifdef _WINDOWS
+#include <windows.h>
+#endif  // _WINDOWS
+
+#include "build/build_config.h"
+
+namespace gpu_demos {
+
+#if defined(OS_WIN)
+typedef HWND NativeWindowHandle;
+#endif  // defined(OS_WIN)
+
+}  // namespace gpu_demos
+#endif  // GPU_DEMOS_APP_FRAMEWORK_PLATFORM_H_
diff --git a/gpu/demos/demos.gyp b/gpu/demos/demos.gyp
new file mode 100644
index 0000000..addfa0a
--- /dev/null
+++ b/gpu/demos/demos.gyp
@@ -0,0 +1,33 @@
+# Copyright (c) 2009 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'includes': [
+    '../../build/common.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'app_framework',
+      'type': 'static_library',
+      'dependencies': [
+        '../gpu.gyp:command_buffer_client',
+        '../gpu.gyp:command_buffer_service',
+      ],
+      'sources': [
+        'app_framework/application.cc',
+        'app_framework/application.h',
+        'app_framework/platform.h',
+      ],
+    },
+  ]
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2: