/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */

/* 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_ */