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// Copyright 2014 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 CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
#define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
#include "base/mac/scoped_cftyperef.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/gpu/gpu_command_buffer_stub.h"
#include "content/common/gpu/image_transport_surface.h"
#include "ui/gl/gl_bindings.h"
namespace content {
// We are backed by an offscreen surface for the purposes of creating
// a context, but use FBOs to render to texture. The texture may be backed by
// an IOSurface, or it may be presented to the screen via a CALayer, depending
// on the StorageProvider class specified.
class ImageTransportSurfaceFBO
: public gfx::GLSurface,
public ImageTransportSurface,
public GpuCommandBufferStub::DestructionObserver {
public:
// The interface through which storage for the color buffer of the FBO is
// allocated.
class StorageProvider {
public:
virtual ~StorageProvider() {}
// IOSurfaces cause too much address space fragmentation if they are
// allocated on every resize. This gets a rounded size for allocation.
virtual gfx::Size GetRoundedSize(gfx::Size size) = 0;
// Allocate the storage for the color buffer. The specified context is
// current, and there is a texture bound to GL_TEXTURE_RECTANGLE_ARB.
virtual bool AllocateColorBufferStorage(
CGLContextObj context, const base::Closure& context_dirtied_callback,
GLuint texture, gfx::Size size, float scale_factor) = 0;
// Free the storage allocated in the AllocateColorBufferStorage call. The
// GL texture that was bound has already been deleted by the caller.
virtual void FreeColorBufferStorage() = 0;
// Called when the frame size has changed (the buffer may not have been
// reallocated, since its size may be rounded).
virtual void FrameSizeChanged(
const gfx::Size& pixel_size, float scale_factor) = 0;
// Swap buffers, or post sub-buffer.
virtual void SwapBuffers() = 0;
// Indicate that the backbuffer will be written to.
virtual void WillWriteToBackbuffer() = 0;
// Indicate that the backbuffer has been discarded and should not be seen
// again.
virtual void DiscardBackbuffer() = 0;
// Called once for every SwapBuffers call when the IPC for the present has
// been processed by the browser. |disable_throttling| is set if the
// browser suspects that GPU back-pressure should be disabled.
virtual void SwapBuffersAckedByBrowser(bool disable_throttling) = 0;
};
ImageTransportSurfaceFBO(GpuChannelManager* manager,
GpuCommandBufferStub* stub,
gfx::PluginWindowHandle handle);
// GLSurface implementation
bool Initialize() override;
void Destroy() override;
bool DeferDraws() override;
bool IsOffscreen() override;
bool SwapBuffers() override;
bool PostSubBuffer(int x, int y, int width, int height) override;
bool SupportsPostSubBuffer() override;
gfx::Size GetSize() override;
void* GetHandle() override;
void* GetDisplay() override;
bool OnMakeCurrent(gfx::GLContext* context) override;
void NotifyWasBound() override;
unsigned int GetBackingFrameBufferObject() override;
bool SetBackbufferAllocation(bool allocated) override;
void SetFrontbufferAllocation(bool allocated) override;
// Called when the context may continue to make forward progress after a swap.
void SendSwapBuffers(uint64 surface_handle,
const gfx::Size pixel_size,
float scale_factor);
void SetRendererID(int renderer_id);
protected:
// ImageTransportSurface implementation
void OnBufferPresented(
const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
void OnResize(gfx::Size pixel_size, float scale_factor) override;
void SetLatencyInfo(const std::vector<ui::LatencyInfo>&) override;
void WakeUpGpu() override;
// GpuCommandBufferStub::DestructionObserver implementation.
void OnWillDestroyStub() override;
private:
~ImageTransportSurfaceFBO() override;
void AdjustBufferAllocation();
void DestroyFramebuffer();
void AllocateOrResizeFramebuffer(
const gfx::Size& pixel_size, float scale_factor);
bool SwapBuffersInternal();
scoped_ptr<StorageProvider> storage_provider_;
// Tracks the current buffer allocation state.
bool backbuffer_suggested_allocation_;
bool frontbuffer_suggested_allocation_;
uint32 fbo_id_;
GLuint texture_id_;
GLuint depth_stencil_renderbuffer_id_;
bool has_complete_framebuffer_;
// Weak pointer to the context that this was last made current to.
gfx::GLContext* context_;
gfx::Size pixel_size_;
gfx::Size rounded_pixel_size_;
float scale_factor_;
// Whether or not we've successfully made the surface current once.
bool made_current_;
// Whether a SwapBuffers IPC needs to be sent to the browser.
bool is_swap_buffers_send_pending_;
std::vector<ui::LatencyInfo> latency_info_;
scoped_ptr<ImageTransportHelper> helper_;
DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
};
} // namespace content
#endif // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_