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// Copyright (c) 2012 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 "ui/gl/gl_surface.h"
#include <OpenGL/CGLRenderers.h>
#include "base/basictypes.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface_osmesa.h"
#include "ui/gl/gl_surface_stub.h"
#include "ui/gl/gpu_switching_manager.h"
namespace gfx {
namespace {
// A "no-op" surface. It is not required that a CGLContextObj have an
// associated drawable (pbuffer or fullscreen context) in order to be
// made current. Everywhere this surface type is used, we allocate an
// FBO at the user level as the drawable of the associated context.
class GL_EXPORT NoOpGLSurface : public GLSurface {
public:
explicit NoOpGLSurface(const gfx::Size& size) : size_(size) {}
// Implement GLSurface.
bool Initialize() override { return true; }
void Destroy() override {}
bool IsOffscreen() override { return true; }
bool SwapBuffers() override {
NOTREACHED() << "Cannot call SwapBuffers on a NoOpGLSurface.";
return false;
}
gfx::Size GetSize() override { return size_; }
void* GetHandle() override { return NULL; }
void* GetDisplay() override { return NULL; }
bool IsSurfaceless() const override { return true; }
protected:
~NoOpGLSurface() override {}
private:
gfx::Size size_;
DISALLOW_COPY_AND_ASSIGN(NoOpGLSurface);
};
// static
bool InitializeOneOffForSandbox() {
static bool initialized = false;
if (initialized)
return true;
// This is called from the sandbox warmup code on Mac OS X.
// GPU-related stuff is very slow without this, probably because
// the sandbox prevents loading graphics drivers or some such.
std::vector<CGLPixelFormatAttribute> attribs;
if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
// Avoid switching to the discrete GPU just for this pixel
// format selection.
attribs.push_back(kCGLPFAAllowOfflineRenderers);
}
if (GetGLImplementation() == kGLImplementationAppleGL) {
attribs.push_back(kCGLPFARendererID);
attribs.push_back(static_cast<CGLPixelFormatAttribute>(
kCGLRendererGenericFloatID));
}
attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
CGLPixelFormatObj format;
GLint num_pixel_formats;
if (CGLChoosePixelFormat(&attribs.front(),
&format,
&num_pixel_formats) != kCGLNoError) {
LOG(ERROR) << "Error choosing pixel format.";
return false;
}
if (!format) {
LOG(ERROR) << "format == 0.";
return false;
}
CGLReleasePixelFormat(format);
DCHECK_NE(num_pixel_formats, 0);
initialized = true;
return true;
}
} // namespace
bool GLSurface::InitializeOneOffInternal() {
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
case kGLImplementationAppleGL:
if (!InitializeOneOffForSandbox()) {
LOG(ERROR) << "GLSurfaceCGL::InitializeOneOff failed.";
return false;
}
break;
default:
break;
}
return true;
}
scoped_refptr<GLSurface> GLSurface::CreateViewGLSurface(
gfx::AcceleratedWidget window) {
TRACE_EVENT0("gpu", "GLSurface::CreateViewGLSurface");
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
case kGLImplementationAppleGL: {
NOTIMPLEMENTED() << "No onscreen support on Mac.";
return NULL;
}
case kGLImplementationOSMesaGL: {
scoped_refptr<GLSurface> surface(new GLSurfaceOSMesaHeadless());
if (!surface->Initialize())
return NULL;
return surface;
}
case kGLImplementationMockGL:
return new GLSurfaceStub;
default:
NOTREACHED();
return NULL;
}
}
scoped_refptr<GLSurface> GLSurface::CreateOffscreenGLSurface(
const gfx::Size& size) {
TRACE_EVENT0("gpu", "GLSurface::CreateOffscreenGLSurface");
switch (GetGLImplementation()) {
case kGLImplementationOSMesaGL: {
scoped_refptr<GLSurface> surface(
new GLSurfaceOSMesa(OSMesaSurfaceFormatRGBA, size));
if (!surface->Initialize())
return NULL;
return surface;
}
case kGLImplementationDesktopGL:
case kGLImplementationAppleGL: {
scoped_refptr<GLSurface> surface(new NoOpGLSurface(size));
if (!surface->Initialize())
return NULL;
return surface;
}
case kGLImplementationMockGL:
return new GLSurfaceStub;
default:
NOTREACHED();
return NULL;
}
}
} // namespace gfx
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