Resubmit 35500: Added an application framework for demos. Ported hellotriangl...

gpu/demos/app_framework/application.cc

Index: gpu/demos/app_framework/application.cc
===================================================================
--- gpu/demos/app_framework/application.cc	(revision 0)
+++ gpu/demos/app_framework/application.cc	(revision 0)
@@ -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)
Property changes on: gpu\demos\app_framework\application.cc
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Added: svn:eol-style
   + LF