ui/gl/gl_surface_wgl.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gl/gl_surface_wgl.h"
   6
   7 #include "base/debug/trace_event.h"
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/gl/gl_bindings.h"
  11 #include "ui/gl/gl_gl_api_implementation.h"
  12 #include "ui/gl/gl_wgl_api_implementation.h"
  13
  14 namespace gfx {
  15
  16 namespace {
  17 const PIXELFORMATDESCRIPTOR kPixelFormatDescriptor = {
  18   sizeof(kPixelFormatDescriptor),    // Size of structure.
  19   1,                       // Default version.
  20   PFD_DRAW_TO_WINDOW |     // Window drawing support.
  21   PFD_SUPPORT_OPENGL |     // OpenGL support.
  22   PFD_DOUBLEBUFFER,        // Double buffering support (not stereo).
  23   PFD_TYPE_RGBA,           // RGBA color mode (not indexed).
  24   24,                      // 24 bit color mode.
  25   0, 0, 0, 0, 0, 0,        // Don't set RGB bits & shifts.
  26   8, 0,                    // 8 bit alpha
  27   0,                       // No accumulation buffer.
  28   0, 0, 0, 0,              // Ignore accumulation bits.
  29   0,                       // no z-buffer.
  30   0,                       // no stencil buffer.
  31   0,                       // No aux buffer.
  32   PFD_MAIN_PLANE,          // Main drawing plane (not overlay).
  33   0,                       // Reserved.
  34   0, 0, 0,                 // Layer masks ignored.
  35 };
  36
  37 LRESULT CALLBACK IntermediateWindowProc(HWND window,
  38                                         UINT message,
  39                                         WPARAM w_param,
  40                                         LPARAM l_param) {
  41   switch (message) {
  42     case WM_ERASEBKGND:
  43       // Prevent windows from erasing the background.
  44       return 1;
  45     case WM_PAINT:
  46       // Do not paint anything.
  47       PAINTSTRUCT paint;
  48       if (BeginPaint(window, &paint))
  49         EndPaint(window, &paint);
  50       return 0;
  51     default:
  52       return DefWindowProc(window, message, w_param, l_param);
  53   }
  54 }
  55
  56 class DisplayWGL {
  57  public:
  58   DisplayWGL()
  59       : module_handle_(0),
  60         window_class_(0),
  61         window_handle_(0),
  62         device_context_(0),
  63         pixel_format_(0) {
  64   }
  65
  66   ~DisplayWGL() {
  67     if (window_handle_)
  68       DestroyWindow(window_handle_);
  69     if (window_class_)
  70       UnregisterClass(reinterpret_cast<wchar_t*>(window_class_),
  71                       module_handle_);
  72   }
  73
  74   bool Init() {
  75     // We must initialize a GL context before we can bind to extension entry
  76     // points. This requires the device context for a window.
  77     if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT |
  78                            GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
  79                            reinterpret_cast<wchar_t*>(IntermediateWindowProc),
  80                            &module_handle_)) {
  81       LOG(ERROR) << "GetModuleHandleEx failed.";
  82       return false;
  83     }
  84
  85     WNDCLASS intermediate_class;
  86     intermediate_class.style = CS_OWNDC;
  87     intermediate_class.lpfnWndProc = IntermediateWindowProc;
  88     intermediate_class.cbClsExtra = 0;
  89     intermediate_class.cbWndExtra = 0;
  90     intermediate_class.hInstance = module_handle_;
  91     intermediate_class.hIcon = LoadIcon(NULL, IDI_APPLICATION);
  92     intermediate_class.hCursor = LoadCursor(NULL, IDC_ARROW);
  93     intermediate_class.hbrBackground = NULL;
  94     intermediate_class.lpszMenuName = NULL;
  95     intermediate_class.lpszClassName = L"Intermediate GL Window";
  96     window_class_ = RegisterClass(&intermediate_class);
  97     if (!window_class_) {
  98       LOG(ERROR) << "RegisterClass failed.";
  99       return false;
 100     }
 101
 102     window_handle_ = CreateWindowEx(WS_EX_NOPARENTNOTIFY,
 103                                     reinterpret_cast<wchar_t*>(window_class_),
 104                                     L"",
 105                                     WS_OVERLAPPEDWINDOW,
 106                                     0,
 107                                     0,
 108                                     100,
 109                                     100,
 110                                     NULL,
 111                                     NULL,
 112                                     NULL,
 113                                     NULL);
 114     if (!window_handle_) {
 115       LOG(ERROR) << "CreateWindow failed.";
 116       return false;
 117     }
 118
 119     device_context_ = GetDC(window_handle_);
 120     pixel_format_ = ChoosePixelFormat(device_context_,
 121                                       &kPixelFormatDescriptor);
 122     if (pixel_format_ == 0) {
 123       LOG(ERROR) << "Unable to get the pixel format for GL context.";
 124       return false;
 125     }
 126     if (!SetPixelFormat(device_context_,
 127                         pixel_format_,
 128                         &kPixelFormatDescriptor)) {
 129       LOG(ERROR) << "Unable to set the pixel format for temporary GL context.";
 130       return false;
 131     }
 132
 133     return true;
 134   }
 135
 136   ATOM window_class() const { return window_class_; }
 137   HDC device_context() const { return device_context_; }
 138   int pixel_format() const { return pixel_format_; }
 139
 140  private:
 141   HINSTANCE module_handle_;
 142   ATOM window_class_;
 143   HWND window_handle_;
 144   HDC device_context_;
 145   int pixel_format_;
 146 };
 147 DisplayWGL* g_display;
 148 }  // namespace
 149
 150 GLSurfaceWGL::GLSurfaceWGL() {
 151 }
 152
 153 GLSurfaceWGL::~GLSurfaceWGL() {
 154 }
 155
 156 void* GLSurfaceWGL::GetDisplay() {
 157   return GetDisplayDC();
 158 }
 159
 160 bool GLSurfaceWGL::InitializeOneOff() {
 161   static bool initialized = false;
 162   if (initialized)
 163     return true;
 164
 165   DCHECK(g_display == NULL);
 166   scoped_ptr<DisplayWGL> wgl_display(new DisplayWGL);
 167   if (!wgl_display->Init())
 168     return false;
 169
 170   g_display = wgl_display.release();
 171   initialized = true;
 172   return true;
 173 }
 174
 175 HDC GLSurfaceWGL::GetDisplayDC() {
 176   return g_display->device_context();
 177 }
 178
 179 NativeViewGLSurfaceWGL::NativeViewGLSurfaceWGL(gfx::AcceleratedWidget window)
 180     : window_(window), child_window_(NULL), device_context_(NULL) {
 181   DCHECK(window);
 182 }
 183
 184 NativeViewGLSurfaceWGL::~NativeViewGLSurfaceWGL() {
 185   Destroy();
 186 }
 187
 188 bool NativeViewGLSurfaceWGL::Initialize() {
 189   DCHECK(!device_context_);
 190
 191   RECT rect;
 192   if (!GetClientRect(window_, &rect)) {
 193     LOG(ERROR) << "GetClientRect failed.\n";
 194     Destroy();
 195     return false;
 196   }
 197
 198   // Create a child window. WGL has problems using a window handle owned by
 199   // another process.
 200   child_window_ =
 201       CreateWindowEx(WS_EX_NOPARENTNOTIFY,
 202                      reinterpret_cast<wchar_t*>(g_display->window_class()),
 203                      L"",
 204                      WS_CHILDWINDOW | WS_DISABLED | WS_VISIBLE,
 205                      0,
 206                      0,
 207                      rect.right - rect.left,
 208                      rect.bottom - rect.top,
 209                      window_,
 210                      NULL,
 211                      NULL,
 212                      NULL);
 213   if (!child_window_) {
 214     LOG(ERROR) << "CreateWindow failed.\n";
 215     Destroy();
 216     return false;
 217   }
 218
 219   // The GL context will render to this window.
 220   device_context_ = GetDC(child_window_);
 221   if (!device_context_) {
 222     LOG(ERROR) << "Unable to get device context for window.";
 223     Destroy();
 224     return false;
 225   }
 226
 227   if (!SetPixelFormat(device_context_,
 228                       g_display->pixel_format(),
 229                       &kPixelFormatDescriptor)) {
 230     LOG(ERROR) << "Unable to set the pixel format for GL context.";
 231     Destroy();
 232     return false;
 233   }
 234
 235   return true;
 236 }
 237
 238 void NativeViewGLSurfaceWGL::Destroy() {
 239   if (child_window_ && device_context_)
 240     ReleaseDC(child_window_, device_context_);
 241
 242   if (child_window_)
 243     DestroyWindow(child_window_);
 244
 245   child_window_ = NULL;
 246   device_context_ = NULL;
 247 }
 248
 249 bool NativeViewGLSurfaceWGL::IsOffscreen() {
 250   return false;
 251 }
 252
 253 bool NativeViewGLSurfaceWGL::SwapBuffers() {
 254   TRACE_EVENT2("gpu", "NativeViewGLSurfaceWGL:RealSwapBuffers",
 255       "width", GetSize().width(),
 256       "height", GetSize().height());
 257
 258   // Resize the child window to match the parent before swapping. Do not repaint
 259   // it as it moves.
 260   RECT rect;
 261   if (!GetClientRect(window_, &rect))
 262     return false;
 263   if (!MoveWindow(child_window_,
 264                   0,
 265                   0,
 266                   rect.right - rect.left,
 267                   rect.bottom - rect.top,
 268                   FALSE)) {
 269     return false;
 270   }
 271
 272   DCHECK(device_context_);
 273   return ::SwapBuffers(device_context_) == TRUE;
 274 }
 275
 276 gfx::Size NativeViewGLSurfaceWGL::GetSize() {
 277   RECT rect;
 278   BOOL result = GetClientRect(child_window_, &rect);
 279   DCHECK(result);
 280   return gfx::Size(rect.right - rect.left, rect.bottom - rect.top);
 281 }
 282
 283 void* NativeViewGLSurfaceWGL::GetHandle() {
 284   return device_context_;
 285 }
 286
 287 PbufferGLSurfaceWGL::PbufferGLSurfaceWGL(const gfx::Size& size)
 288     : size_(size),
 289       device_context_(NULL),
 290       pbuffer_(NULL) {
 291   // Some implementations of Pbuffer do not support having a 0 size. For such
 292   // cases use a (1, 1) surface.
 293   if (size_.GetArea() == 0)
 294     size_.SetSize(1, 1);
 295 }
 296
 297 PbufferGLSurfaceWGL::~PbufferGLSurfaceWGL() {
 298   Destroy();
 299 }
 300
 301 bool PbufferGLSurfaceWGL::Initialize() {
 302   DCHECK(!device_context_);
 303
 304   if (!gfx::g_driver_wgl.fn.wglCreatePbufferARBFn) {
 305     LOG(ERROR) << "wglCreatePbufferARB not available.";
 306     Destroy();
 307     return false;
 308   }
 309
 310   const int kNoAttributes[] = { 0 };
 311   pbuffer_ = wglCreatePbufferARB(g_display->device_context(),
 312                                  g_display->pixel_format(),
 313                                  size_.width(), size_.height(),
 314                                  kNoAttributes);
 315
 316   if (!pbuffer_) {
 317     LOG(ERROR) << "Unable to create pbuffer.";
 318     Destroy();
 319     return false;
 320   }
 321
 322   device_context_ = wglGetPbufferDCARB(static_cast<HPBUFFERARB>(pbuffer_));
 323   if (!device_context_) {
 324     LOG(ERROR) << "Unable to get pbuffer device context.";
 325     Destroy();
 326     return false;
 327   }
 328
 329   return true;
 330 }
 331
 332 void PbufferGLSurfaceWGL::Destroy() {
 333   if (pbuffer_ && device_context_)
 334     wglReleasePbufferDCARB(static_cast<HPBUFFERARB>(pbuffer_), device_context_);
 335
 336   device_context_ = NULL;
 337
 338   if (pbuffer_) {
 339     wglDestroyPbufferARB(static_cast<HPBUFFERARB>(pbuffer_));
 340     pbuffer_ = NULL;
 341   }
 342 }
 343
 344 bool PbufferGLSurfaceWGL::IsOffscreen() {
 345   return true;
 346 }
 347
 348 bool PbufferGLSurfaceWGL::SwapBuffers() {
 349   NOTREACHED() << "Attempted to call SwapBuffers on a pbuffer.";
 350   return false;
 351 }
 352
 353 gfx::Size PbufferGLSurfaceWGL::GetSize() {
 354   return size_;
 355 }
 356
 357 void* PbufferGLSurfaceWGL::GetHandle() {
 358   return device_context_;
 359 }
 360
 361 }  // namespace gfx