Class EglContext

tensorflow/lite/delegates/gpu/gl/egl_context.h:34–87

EglContext is an RAII wrapper for an EGLContext. EglContext is moveable but not copyable. See https://www.khronos.org/registry/EGL/sdk/docs/man/html/eglIntro.xhtml for more info.

// See https://www.khronos.org/registry/EGL/sdk/docs/man/html/eglIntro.xhtml for
// more info.
class EglContext {
 public:
  // Creates an invalid EglContext.
  EglContext()
      : context_(EGL_NO_CONTEXT),
        display_(EGL_NO_DISPLAY),
        config_(EGL_NO_CONFIG_KHR),
        has_ownership_(false) {}

  EglContext(EGLContext context, EGLDisplay display, EGLConfig config,
             bool has_ownership)
      : context_(context),
        display_(display),
        config_(config),
        has_ownership_(has_ownership) {}

  // Move only
  EglContext(EglContext&& other);
  EglContext& operator=(EglContext&& other);
  EglContext(const EglContext&) = delete;
  EglContext& operator=(const EglContext&) = delete;

  ~EglContext() { Invalidate(); }

  EGLContext context() const { return context_; }

  EGLDisplay display() const { return display_; }

  EGLConfig config() const { return config_; }

  // Make this EglContext the current EGL context on this thread, replacing
  // the existing current.
  Status MakeCurrent(EGLSurface read, EGLSurface write);

  Status MakeCurrentSurfaceless() {
    return MakeCurrent(EGL_NO_SURFACE, EGL_NO_SURFACE);
  }

  // Returns true if this is the currently bound EGL context.
  bool IsCurrent() const;

  // Returns true if this object actually owns corresponding EGL context
  // and manages it's lifetime.
  bool has_ownership() const { return has_ownership_; }

 private:
  void Invalidate();

  EGLContext context_;
  EGLDisplay display_;
  EGLConfig config_;

  bool has_ownership_;
};

// It uses the EGL_KHR_no_config_context extension to create a no config context
// since most modern hardware supports the extension.