/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2015 - Daniel De Matteis
 * 
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INPUT_OVERLAY_H__
#define INPUT_OVERLAY_H__

#include <stdint.h>
#include <boolean.h>

#include <retro_miscellaneous.h>
#include "../libretro.h"

#ifdef __cplusplus
extern "C" {
#endif

#define OVERLAY_GET_KEY(state, key) (((state)->keys[(key) / 32] >> ((key) % 32)) & 1)
#define OVERLAY_SET_KEY(state, key) (state)->keys[(key) / 32] |= 1 << ((key) % 32)
#define OVERLAY_CLEAR_KEY(state, key) (state)->keys[(key) / 32] &= ~(1 << ((key) % 32))

/* Overlay driver acts as a medium between input drivers 
 * and video driver.
 *
 * Coordinates are fetched from input driver, and an 
 * overlay with pressable actions are displayed on-screen.
 *
 * This interface requires that the video driver has support 
 * for the overlay interface.
 */

typedef struct video_overlay_interface
{
   void (*enable)(void *data, bool state);
   bool (*load)(void *data,
         const void *images, unsigned num_images);
   void (*tex_geom)(void *data, unsigned image,
         float x, float y, float w, float h);
   void (*vertex_geom)(void *data, unsigned image,
         float x, float y, float w, float h);
   void (*full_screen)(void *data, bool enable);
   void (*set_alpha)(void *data, unsigned image, float mod);
} video_overlay_interface_t;

enum overlay_hitbox
{
   OVERLAY_HITBOX_RADIAL = 0,
   OVERLAY_HITBOX_RECT
};

enum overlay_type
{
   OVERLAY_TYPE_BUTTONS = 0,
   OVERLAY_TYPE_ANALOG_LEFT,
   OVERLAY_TYPE_ANALOG_RIGHT,
   OVERLAY_TYPE_KEYBOARD
};

enum overlay_status
{
   OVERLAY_STATUS_NONE = 0,
   OVERLAY_STATUS_DEFERRED_LOAD,
   OVERLAY_STATUS_DEFERRED_LOADING_IMAGE,
   OVERLAY_STATUS_DEFERRED_LOADING_IMAGE_PROCESS,
   OVERLAY_STATUS_DEFERRED_LOADING,
   OVERLAY_STATUS_DEFERRED_LOADING_RESOLVE,
   OVERLAY_STATUS_DEFERRED_DONE,
   OVERLAY_STATUS_DEFERRED_ERROR
};

enum overlay_image_transfer_status
{
   OVERLAY_IMAGE_TRANSFER_NONE = 0,
   OVERLAY_IMAGE_TRANSFER_BUSY,
   OVERLAY_IMAGE_TRANSFER_DONE,
   OVERLAY_IMAGE_TRANSFER_DESC_IMAGE_ITERATE,
   OVERLAY_IMAGE_TRANSFER_DESC_ITERATE,
   OVERLAY_IMAGE_TRANSFER_DESC_DONE,
   OVERLAY_IMAGE_TRANSFER_ERROR
};

typedef struct overlay_desc overlay_desc_t;

typedef struct input_overlay input_overlay_t;

/**
 * input_overlay_new:
 * @path                  : Path to overlay file.
 * @enable                : Enable the overlay after initializing it?
 *
 * Creates and initializes an overlay handle.
 *
 * Returns: Overlay handle on success, otherwise NULL.
 **/
input_overlay_t *input_overlay_new(const char *path, bool enable,
      float alpha_mod, float scale_factor);

bool input_overlay_load_overlays(void);

bool input_overlay_load_overlays_iterate(void);

bool input_overlay_load_overlays_resolve_iterate(void);

bool input_overlay_new_done(void);

/**
 * input_overlay_free:
 *
 * Frees overlay handle.
 **/
void input_overlay_free(void);

/**
 * input_overlay_set_alpha_mod:
 * @mod                   : New modulating factor to apply.
 *
 * Sets a modulating factor for alpha channel. Default is 1.0.
 * The alpha factor is applied for all overlays.
 **/
void input_overlay_set_alpha_mod(float mod);

/**
 * input_overlay_set_scale_factor:
 * @scale                 : Factor of scale to apply.
 *
 * Scales the overlay by a factor of scale.
 **/
void input_overlay_set_scale_factor(float scale);

/**
 * input_overlay_next:
 *
 * Switch to the next available overlay
 * screen.
 **/
void input_overlay_next(float opacity);

bool input_overlay_data_is_active(void);

void input_overlay_free_ptr(void);

int input_overlay_new_ptr(void);

enum overlay_status input_overlay_status(void);

/*
 * input_poll_overlay:
 * @ol : pointer to overlay 
 *
 * Poll pressed buttons/keys on currently active overlay.
 **/
void input_poll_overlay(float opacity);

void input_state_overlay(int16_t *ret,
      unsigned port, unsigned device, unsigned idx,
      unsigned id);

bool input_overlay_key_pressed(int key);

bool input_overlay_is_alive(void);

#ifdef __cplusplus
}
#endif

#endif