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      1 // Copyright 2014 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.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/memory/ref_counted.h"
      9 #include "third_party/khronos/EGL/egl.h"
     10 #include "ui/gfx/native_widget_types.h"
     11 #include "ui/gl/gl_implementation.h"
     12 #include "ui/gl/gl_surface_egl.h"
     13 #include "ui/gl/gl_surface_osmesa.h"
     14 #include "ui/gl/gl_surface_stub.h"
     15 
     16 namespace gfx {
     17 
     18 // static
     19 bool GLSurface::InitializeOneOffInternal() {
     20   switch (GetGLImplementation()) {
     21     case kGLImplementationEGLGLES2:
     22       if (!GLSurfaceEGL::InitializeOneOff()) {
     23         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
     24         return false;
     25       }
     26     default:
     27       break;
     28   }
     29   return true;
     30 }
     31 
     32 // static
     33 scoped_refptr<GLSurface> GLSurface::CreateViewGLSurface(
     34     gfx::AcceleratedWidget window) {
     35   CHECK_NE(kGLImplementationNone, GetGLImplementation());
     36   if (GetGLImplementation() == kGLImplementationOSMesaGL) {
     37     scoped_refptr<GLSurface> surface(new GLSurfaceOSMesaHeadless());
     38     if (!surface->Initialize())
     39       return NULL;
     40     return surface;
     41   }
     42   DCHECK(GetGLImplementation() == kGLImplementationEGLGLES2);
     43   if (window != kNullAcceleratedWidget) {
     44     scoped_refptr<GLSurface> surface = new NativeViewGLSurfaceEGL(window);
     45     if (surface->Initialize())
     46       return surface;
     47   } else {
     48     scoped_refptr<GLSurface> surface = new GLSurfaceStub();
     49     if (surface->Initialize())
     50       return surface;
     51   }
     52   return NULL;
     53 }
     54 
     55 // static
     56 scoped_refptr<GLSurface> GLSurface::CreateOffscreenGLSurface(
     57     const gfx::Size& size) {
     58   CHECK_NE(kGLImplementationNone, GetGLImplementation());
     59   switch (GetGLImplementation()) {
     60     case kGLImplementationOSMesaGL: {
     61       scoped_refptr<GLSurface> surface(
     62           new GLSurfaceOSMesa(OSMesaSurfaceFormatBGRA, size));
     63       if (!surface->Initialize())
     64         return NULL;
     65 
     66       return surface;
     67     }
     68     case kGLImplementationEGLGLES2: {
     69       scoped_refptr<GLSurface> surface;
     70       if (GLSurfaceEGL::IsEGLSurfacelessContextSupported() &&
     71           (size.width() == 0 && size.height() == 0)) {
     72         surface = new SurfacelessEGL(size);
     73       } else {
     74         surface = new PbufferGLSurfaceEGL(size);
     75       }
     76 
     77       if (!surface->Initialize())
     78         return NULL;
     79       return surface;
     80     }
     81     default:
     82       NOTREACHED();
     83       return NULL;
     84   }
     85 }
     86 
     87 EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
     88   return EGL_DEFAULT_DISPLAY;
     89 }
     90 
     91 }  // namespace gfx
     92