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// Copyright (c) 2010 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.
#ifndef GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_H_
#define GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_H_
#include <build/build_config.h>
#include "base/basictypes.h"
#include "gfx/native_widget_types.h"
#include "gfx/size.h"
#include "gpu/command_buffer/common/logging.h"
#include "gpu/command_buffer/service/gl_utils.h"
class AcceleratedSurface;
namespace gpu {
#if defined(UNIT_TEST)
typedef void* HDC;
struct Display;
typedef void* GLContextHandle;
typedef void* PbufferHandle;
#elif defined(OS_WIN)
typedef HGLRC GLContextHandle;
typedef HPBUFFERARB PbufferHandle;
#elif defined(OS_LINUX)
typedef GLXContext GLContextHandle;
typedef GLXPbuffer PbufferHandle;
#elif defined(OS_MACOSX)
typedef CGLContextObj GLContextHandle;
typedef CGLPBufferObj PbufferHandle;
#endif
bool InitializeGLEW();
// Encapsulates an OpenGL context, hiding platform specific management.
class GLContext {
public:
GLContext();
virtual ~GLContext();
// Destroys the GL context.
virtual void Destroy() = 0;
// Makes the GL context current on the current thread.
virtual bool MakeCurrent() = 0;
// Returns true if this context is offscreen.
virtual bool IsOffscreen() = 0;
// Swaps front and back buffers. This has no effect for off-screen
// contexts.
virtual void SwapBuffers() = 0;
// Get the size of the back buffer.
virtual gfx::Size GetSize() = 0;
// Get the underlying platform specific GL context "handle".
virtual GLContextHandle GetHandle() = 0;
private:
DISALLOW_COPY_AND_ASSIGN(GLContext);
};
// This class is a wrapper around a GL context that renders directly to a
// window.
class ViewGLContext : public GLContext {
public:
#if defined(OS_WIN)
explicit ViewGLContext(gfx::PluginWindowHandle window)
: window_(window),
device_context_(NULL),
context_(NULL) {
DCHECK(window);
}
#elif defined(OS_LINUX)
ViewGLContext(Display* display, gfx::PluginWindowHandle window)
: display_(display),
window_(window),
context_(NULL) {
DCHECK(display);
DCHECK(window);
}
#elif defined(OS_MACOSX)
explicit ViewGLContext(AcceleratedSurface* surface) : surface_(surface) {
DCHECK(surface);
}
#endif
// Initializes the GL context.
bool Initialize(bool multisampled);
virtual void Destroy();
virtual bool MakeCurrent();
virtual bool IsOffscreen();
virtual void SwapBuffers();
virtual gfx::Size GetSize();
virtual GLContextHandle GetHandle();
private:
#if defined(OS_WIN)
gfx::PluginWindowHandle window_;
HDC device_context_;
GLContextHandle context_;
#elif defined(OS_LINUX)
Display* display_;
gfx::PluginWindowHandle window_;
GLContextHandle context_;
#elif defined(OS_MACOSX)
AcceleratedSurface* surface_;
#endif
DISALLOW_COPY_AND_ASSIGN(ViewGLContext);
};
// This class is a wrapper around a GL context used for offscreen rendering.
// It is initially backed by a 1x1 pbuffer. Use it to create an FBO to do useful
// rendering.
class PbufferGLContext : public GLContext {
public:
#if defined(OS_WIN)
PbufferGLContext()
: context_(NULL),
device_context_(NULL),
pbuffer_(NULL) {
}
#elif defined(OS_LINUX)
explicit PbufferGLContext(Display* display)
: context_(NULL),
display_(display),
pbuffer_(NULL) {
DCHECK(display_);
}
#elif defined(OS_MACOSX)
PbufferGLContext()
: context_(NULL),
pbuffer_(NULL) {
}
#endif
// Initializes the GL context.
bool Initialize(GLContext* shared_context);
virtual void Destroy();
virtual bool MakeCurrent();
virtual bool IsOffscreen();
virtual void SwapBuffers();
virtual gfx::Size GetSize();
virtual GLContextHandle GetHandle();
private:
GLContextHandle context_;
#if defined(OS_WIN)
HDC device_context_;
PbufferHandle pbuffer_;
#elif defined(OS_LINUX)
Display* display_;
PbufferHandle pbuffer_;
#elif defined(OS_MACOSX)
PbufferHandle pbuffer_;
#endif
DISALLOW_COPY_AND_ASSIGN(PbufferGLContext);
};
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_H_
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