/**
 * @defgroup GLView GLView
 *
 * A simple GLView widget that allows GL rendering.
 *
 * Signals that you can add callbacks for are:
 *
 * @{
 */

typedef void (*Elm_GLView_Func_Cb)(Evas_Object *obj);

typedef enum
{
   ELM_GLVIEW_ALPHA = 1,
   ELM_GLVIEW_DEPTH = 2,
   ELM_GLVIEW_STENCIL = 4
} Elm_GLView_Mode;

/**
 * Defines a policy for the glview resizing.
 *
 * @note Default is ELM_GLVIEW_RESIZE_POLICY_RECREATE
 */
typedef enum
{
   ELM_GLVIEW_RESIZE_POLICY_RECREATE = 1, /**< Resize the internal surface along with the image */
   ELM_GLVIEW_RESIZE_POLICY_SCALE = 2 /**< Only reize the internal image and not the surface */
} Elm_GLView_Resize_Policy;

typedef enum
{
   ELM_GLVIEW_RENDER_POLICY_ON_DEMAND = 1, /**< Render only when there is a need for redrawing */
   ELM_GLVIEW_RENDER_POLICY_ALWAYS = 2 /**< Render always even when it is not visible */
} Elm_GLView_Render_Policy;

/**
 * Add a new glview to the parent
 *
 * @param parent The parent object
 * @return The new object or NULL if it cannot be created
 *
 * @ingroup GLView
 */
EAPI Evas_Object *elm_glview_add(Evas_Object *parent);

/**
 * Sets the size of the glview
 *
 * @param obj The glview object
 * @param width width of the glview object
 * @param height height of the glview object
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_size_set(Evas_Object *obj, Evas_Coord width, Evas_Coord height);

/**
 * Gets the size of the glview.
 *
 * @param obj The glview object
 * @param width width of the glview object
 * @param height height of the glview object
 *
 * Note that this function returns the actual image size of the
 * glview.  This means that when the scale policy is set to
 * ELM_GLVIEW_RESIZE_POLICY_SCALE, it'll return the non-scaled
 * size.
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_size_get(const Evas_Object *obj, Evas_Coord *width, Evas_Coord *height);

/**
 * Gets the gl api struct for gl rendering
 *
 * @param obj The glview object
 * @return The api object or NULL if it cannot be created
 *
 * @ingroup GLView
 */
EAPI Evas_GL_API *elm_glview_gl_api_get(const Evas_Object *obj);

/**
 * Set the mode of the GLView. Supports Three simple modes.
 *
 * @param obj The glview object
 * @param mode The mode Options OR'ed enabling Alpha, Depth, Stencil.
 * @return True if set properly.
 *
 * @ingroup GLView
 */
EAPI Eina_Bool    elm_glview_mode_set(Evas_Object *obj, Elm_GLView_Mode mode);

/**
 * Set the resize policy for the glview object.
 *
 * @param obj The glview object.
 * @param policy The scaling policy.
 *
 * By default, the resize policy is set to
 * ELM_GLVIEW_RESIZE_POLICY_RECREATE.  When resize is called it
 * destroys the previous surface and recreates the newly specified
 * size. If the policy is set to ELM_GLVIEW_RESIZE_POLICY_SCALE,
 * however, glview only scales the image object and not the underlying
 * GL Surface.
 *
 * @ingroup GLView
 */
EAPI Eina_Bool    elm_glview_resize_policy_set(Evas_Object *obj, Elm_GLView_Resize_Policy policy);

/**
 * Set the render policy for the glview object.
 *
 * @param obj The glview object.
 * @param policy The render policy.
 *
 * By default, the render policy is set to
 * ELM_GLVIEW_RENDER_POLICY_ON_DEMAND.  This policy is set such
 * that during the render loop, glview is only redrawn if it needs
 * to be redrawn. (i.e. When it is visible) If the policy is set to
 * ELM_GLVIEWW_RENDER_POLICY_ALWAYS, it redraws regardless of
 * whether it is visible/need redrawing or not.
 *
 * @ingroup GLView
 */
EAPI Eina_Bool    elm_glview_render_policy_set(Evas_Object *obj, Elm_GLView_Render_Policy policy);

/**
 * Set the init function that runs once in the main loop.
 *
 * @param obj The glview object.
 * @param func The init function to be registered.
 *
 * The registered init function gets called once during the render loop.
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_init_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);

/**
 * Set the render function that runs in the main loop.
 *
 * @param obj The glview object.
 * @param func The delete function to be registered.
 *
 * The registered del function gets called when GLView object is deleted.
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_del_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);

/**
 * Set the resize function that gets called when resize happens.
 *
 * @param obj The glview object.
 * @param func The resize function to be registered.
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_resize_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);

/**
 * Set the render function that runs in the main loop.
 *
 * @param obj The glview object.
 * @param func The render function to be registered.
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_render_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);

/**
 * Notifies that there has been changes in the GLView.
 *
 * @param obj The glview object.
 *
 * @ingroup GLView
 */
EAPI void         elm_glview_changed_set(Evas_Object *obj);

/**
 * @}
 */