gecko-dev/gfx/gl/SharedSurfaceGL.h

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 4; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef SHARED_SURFACE_GL_H_
#define SHARED_SURFACE_GL_H_

#include "ScopedGLHelpers.h"
#include "SharedSurface.h"
#include "SurfaceTypes.h"
#include "GLContextTypes.h"
#include "gfxTypes.h"
#include "mozilla/Mutex.h"

#include <queue>

namespace mozilla {
namespace gl {
class GLContext;
}  // namespace gl
namespace gfx {
class DataSourceSurface;
}  // namespace gfx
}  // namespace mozilla

namespace mozilla {
namespace gl {

// For readback and bootstrapping:
class SharedSurface_Basic : public SharedSurface {
 public:
  static UniquePtr<SharedSurface_Basic> Create(GLContext* gl,
                                               const GLFormats& formats,
                                               const gfx::IntSize& size,
                                               bool hasAlpha);

  static UniquePtr<SharedSurface_Basic> Wrap(GLContext* gl,
                                             const gfx::IntSize& size,
                                             bool hasAlpha, GLuint tex);

  static SharedSurface_Basic* Cast(SharedSurface* surf) {
    MOZ_ASSERT(surf->mType == SharedSurfaceType::Basic);

    return (SharedSurface_Basic*)surf;
  }

 protected:
  const GLuint mTex;
  const bool mOwnsTex;
  GLuint mFB;

  SharedSurface_Basic(GLContext* gl, const gfx::IntSize& size, bool hasAlpha,
                      GLuint tex, bool ownsTex);

 public:
  virtual ~SharedSurface_Basic();

  virtual void LockProdImpl() override {}
  virtual void UnlockProdImpl() override {}

  virtual void ProducerAcquireImpl() override {}
  virtual void ProducerReleaseImpl() override {}

  virtual GLuint ProdTexture() override { return mTex; }

  virtual bool ToSurfaceDescriptor(
      layers::SurfaceDescriptor* const out_descriptor) override {
    MOZ_CRASH("GFX: ToSurfaceDescriptor");
    return false;
  }
};

class SurfaceFactory_Basic : public SurfaceFactory {
 public:
  SurfaceFactory_Basic(GLContext* gl, const SurfaceCaps& caps,
                       const layers::TextureFlags& flags);

  virtual UniquePtr<SharedSurface> CreateShared(
      const gfx::IntSize& size) override {
    bool hasAlpha = mReadCaps.alpha;
    return SharedSurface_Basic::Create(mGL, mFormats, size, hasAlpha);
  }
};

// Using shared GL textures:
class SharedSurface_GLTexture : public SharedSurface {
 public:
  static UniquePtr<SharedSurface_GLTexture> Create(GLContext* prodGL,
                                                   const GLFormats& formats,
                                                   const gfx::IntSize& size,
                                                   bool hasAlpha);

  static SharedSurface_GLTexture* Cast(SharedSurface* surf) {
    MOZ_ASSERT(surf->mType == SharedSurfaceType::SharedGLTexture);

    return (SharedSurface_GLTexture*)surf;
  }

 protected:
  const GLuint mTex;
  GLsync mSync;

  SharedSurface_GLTexture(GLContext* prodGL, const gfx::IntSize& size,
                          bool hasAlpha, GLuint tex)
      : SharedSurface(SharedSurfaceType::SharedGLTexture,
                      AttachmentType::GLTexture, prodGL, size, hasAlpha, true),
        mTex(tex),
        mSync(0) {}

 public:
  virtual ~SharedSurface_GLTexture();

  virtual void LockProdImpl() override {}
  virtual void UnlockProdImpl() override {}

  virtual void ProducerAcquireImpl() override {}
  virtual void ProducerReleaseImpl() override;

  virtual GLuint ProdTexture() override { return mTex; }

  virtual bool ToSurfaceDescriptor(
      layers::SurfaceDescriptor* const out_descriptor) override;
};

class SurfaceFactory_GLTexture : public SurfaceFactory {
 public:
  SurfaceFactory_GLTexture(GLContext* prodGL, const SurfaceCaps& caps,
                           const RefPtr<layers::LayersIPCChannel>& allocator,
                           const layers::TextureFlags& flags)
      : SurfaceFactory(SharedSurfaceType::SharedGLTexture, prodGL, caps,
                       allocator, flags) {}

  virtual UniquePtr<SharedSurface> CreateShared(
      const gfx::IntSize& size) override {
    bool hasAlpha = mReadCaps.alpha;
    return SharedSurface_GLTexture::Create(mGL, mFormats, size, hasAlpha);
  }
};

}  // namespace gl

} /* namespace mozilla */

#endif /* SHARED_SURFACE_GL_H_ */