/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 GLCONTEXTEGL_H_
#define GLCONTEXTEGL_H_

#include "GLContext.h"
#include "GLLibraryEGL.h"
#include "nsRegion.h"
#include <memory>

class gfxASurface;
namespace mozilla {
namespace layers {
class SurfaceTextureImage;
}  // namespace layers
namespace widget {
class CompositorWidget;
}  // namespace widget
namespace gl {

RefPtr<GLLibraryEGL> DefaultEglLibrary(nsACString* const out_failureId);

inline std::shared_ptr<EglDisplay> DefaultEglDisplay(
    nsACString* const out_failureId) {
  const auto lib = DefaultEglLibrary(out_failureId);
  if (!lib) {
    return nullptr;
  }
  return lib->DefaultDisplay(out_failureId);
}

// -

class GLContextEGL final : public GLContext {
  friend class TextureImageEGL;

 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(GLContextEGL, override)

  static RefPtr<GLContextEGL> CreateGLContext(
      std::shared_ptr<EglDisplay>, const GLContextDesc&, EGLConfig config,
      EGLSurface surface, const bool useGles, nsACString* const out_failureId);

 private:
  GLContextEGL(std::shared_ptr<EglDisplay>, const GLContextDesc&,
               EGLConfig config, EGLSurface surface, EGLContext context);
  ~GLContextEGL();

 public:
  virtual GLContextType GetContextType() const override {
    return GLContextType::EGL;
  }

  static GLContextEGL* Cast(GLContext* gl) {
    MOZ_ASSERT(gl->GetContextType() == GLContextType::EGL);
    return static_cast<GLContextEGL*>(gl);
  }

  bool Init() override;

  virtual bool IsDoubleBuffered() const override { return mIsDoubleBuffered; }

  void SetIsDoubleBuffered(bool aIsDB) { mIsDoubleBuffered = aIsDB; }

  virtual bool IsANGLE() const override { return mEgl->mLib->IsANGLE(); }
  virtual bool IsWARP() const override { return mEgl->mIsWARP; }

  virtual bool BindTexImage() override;

  virtual bool ReleaseTexImage() override;

  void SetEGLSurfaceOverride(EGLSurface surf);
  EGLSurface GetEGLSurfaceOverride() { return mSurfaceOverride; }

  virtual bool MakeCurrentImpl() const override;

  virtual bool IsCurrentImpl() const override;

  virtual bool RenewSurface(widget::CompositorWidget* aWidget) override;

  virtual void ReleaseSurface() override;

  Maybe<SymbolLoader> GetSymbolLoader() const override;

  virtual bool SwapBuffers() override;

  virtual void SetDamage(const nsIntRegion& aDamageRegion) override;

  GLint GetBufferAge() const override;

  virtual void GetWSIInfo(nsCString* const out) const override;

  // hold a reference to the given surface
  // for the lifetime of this context.
  void HoldSurface(gfxASurface* aSurf);

  EGLSurface GetEGLSurface() const { return mSurface; }

  bool HasExtBufferAge() const;
  bool HasKhrPartialUpdate() const;

  bool BindTex2DOffscreen(GLContext* aOffscreen);
  void UnbindTex2DOffscreen(GLContext* aOffscreen);
  void BindOffscreenFramebuffer();

  void Destroy();

  static RefPtr<GLContextEGL> CreateEGLPBufferOffscreenContext(
      std::shared_ptr<EglDisplay>, const GLContextCreateDesc&,
      const gfx::IntSize& size, nsACString* const out_FailureId);
  static RefPtr<GLContextEGL> CreateEGLPBufferOffscreenContextImpl(
      std::shared_ptr<EglDisplay>, const GLContextCreateDesc&,
      const gfx::IntSize& size, bool aUseGles, nsACString* const out_FailureId);

  static EGLSurface CreateEGLSurfaceForCompositorWidget(
      widget::CompositorWidget* aCompositorWidget, const EGLConfig aConfig);

#ifdef MOZ_X11
  static bool FindVisual(bool aUseWebRender, bool useAlpha,
                         int* const out_visualId);
#endif

 protected:
  friend class GLContextProviderEGL;
  friend class GLContextEGLFactory;

  virtual void OnMarkDestroyed() override;

 public:
  const std::shared_ptr<EglDisplay> mEgl;
  const EGLConfig mConfig;
  const EGLContext mContext;

 protected:
  EGLSurface mSurface;
  const EGLSurface mFallbackSurface;

  EGLSurface mSurfaceOverride = EGL_NO_SURFACE;
  RefPtr<gfxASurface> mThebesSurface;
  bool mBound = false;

  bool mIsPBuffer = false;
  bool mIsDoubleBuffered = false;
  bool mCanBindToTexture = false;
  bool mShareWithEGLImage = false;
  bool mOwnsContext = true;

  nsIntRegion mDamageRegion;

  static EGLSurface CreatePBufferSurfaceTryingPowerOfTwo(
      EglDisplay&, EGLConfig, EGLenum bindToTextureFormat,
      gfx::IntSize& pbsize);

  static EGLSurface CreateWaylandBufferSurface(EglDisplay&, EGLConfig,
                                               gfx::IntSize& pbsize);

 public:
  EGLSurface CreateCompatibleSurface(void* aWindow) const;
};

// -
// aVisual is used in Linux only to exactly match window and framebuffer
// visuals on NVIDIA drivers (Bug 1478454).
bool CreateConfig(EglDisplay&, EGLConfig* aConfig, int32_t depth,
                  bool aEnableDepthBuffer, bool aUseGles, int aVisual = 0);

}  // namespace gl
}  // namespace mozilla

#endif  // GLCONTEXTEGL_H_