/**

 * $Id$

 *

 * The PC side of the video support (responsible for actually displaying / 

 * rendering frames)

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * This program 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 Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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.

 */

#ifndef dream_video_H

#define dream_video_H

#include <stdint.h>

#include <glib.h>

#include "lxdream.h"

#ifdef APPLE_BUILD

#include <OpenGL/gl.h>

#include <OpenGL/glext.h>

#else

#include <GL/gl.h>

#include <GL/glext.h>

#endif

#ifdef __cplusplus

extern "C" {

#endif

/**

 * Supported colour formats. Note that BGRA4444 is only ever used for texture

 * rendering (it's not valid for display purposes).

 */

#define COLFMT_BGRA1555  0

#define COLFMT_RGB565    1

#define COLFMT_BGRA4444  2

#define COLFMT_YUV422    3 /* 8-bit YUV (texture source only) */

#define COLFMT_BGR888    4 /* 24-bit BGR */

#define COLFMT_BGRA8888  5

#define COLFMT_INDEX4    6 /* 4 bit indexed colour (texture source only) */

#define COLFMT_INDEX8    7 /* 8-bit indexed colour (texture source only) */

#define COLFMT_BGR0888   8 /* 32-bit BGR */

#define COLFMT_RGB888    9 /* 24-bit RGB (ie GL native) */

struct colour_format {

    GLint type, format, int_format;

    int bpp;

};

extern struct colour_format colour_formats[];

extern int colour_format_bytes[];

/**

 * Structure to hold pixel data held in GL buffers.

 */

struct render_buffer {

    uint32_t width;

    uint32_t height;

    uint32_t rowstride;

    int colour_format;

    sh4addr_t address; /* Address buffer was rendered to, or -1 for unrendered */

    uint32_t size; /* Size of buffer in bytes, must be width*height*bpp */

    gboolean inverted;/* True if the buffer is upside down */

    int scale;

    unsigned int buf_id; /* driver-specific buffer id, if applicable */

    gboolean flushed; /* True if the buffer has been flushed to vram */

};

/**

 * Structure to hold pixel data stored in pvr2 vram, as opposed to data in

 * GL buffers.

 */

struct frame_buffer {

    uint32_t width;

    uint32_t height;

    uint32_t rowstride;

    int colour_format;

    sh4addr_t address;

    uint32_t size; /* Size of buffer in bytes, must be width*height*bpp */

    gboolean inverted;/* True if the buffer is upside down */

    unsigned char *data;

};

/**

 * Core video driver - exports function to setup a GL context, as well as handle

 * keyboard input and display resultant output.

 */

typedef struct display_driver {

    char *name;

    /**

     * Initialize the driver. This is called only once at startup time, and

     * is guaranteed to be called before any other methods.

     * @return TRUE if the driver was successfully initialized, otherwise

     * FALSE.

     */

    gboolean (*init_driver)(void);

    /**

     * Cleanly shutdown the driver. Normally only called at system shutdown

     * time.

     */

    void (*shutdown_driver)(void);

    /**

     * Given a particular keysym, return the keycode associated with it.

     * @param keysym The keysym to be resolved, ie "Tab"

     * @return the display-specific keycode, or 0 if the keysym cannot

     * be resolved.

     */

    uint16_t (*resolve_keysym)( const gchar *keysym );

    /**

     * Create a render target with the given width and height.

     */

    render_buffer_t (*create_render_buffer)( uint32_t width, uint32_t height );

    /**

     * Destroy the specified render buffer and release any associated

     * resources.

     */

    void (*destroy_render_buffer)( render_buffer_t buffer );

    /**

     * Set the current rendering target to the specified buffer.

     */

    gboolean (*set_render_target)( render_buffer_t buffer );

    /**

     * Load the supplied frame buffer into the given render buffer.

     * Included here to allow driver-specific optimizations.

     */

    void (*load_frame_buffer)( frame_buffer_t frame, render_buffer_t render );

    /**

     * Display a single frame using a previously rendered GL buffer.

     */

    gboolean (*display_render_buffer)( render_buffer_t buffer );

    /**

     * Display a single blanked frame using a fixed colour for the

     * entire frame (specified in BGR888 format). 

     */

    gboolean (*display_blank)( uint32_t rgb );

    /**

     * Copy the image data from the GL buffer to the target memory buffer,

     * using the format etc from the buffer. This may force a glFinish()

     * but does not invalidate the buffer.

     * @param target buffer to fill with image data, which must be large enough

     *  to accomodate the image.

     * @param buffer Render buffer to read from.

     * @param rowstride rowstride of the target data

     * @param format colour format to output the data in.

     */

    gboolean (*read_render_buffer)( unsigned char *target, render_buffer_t buffer,

				    int rowstride, int format );

} *display_driver_t;

display_driver_t get_display_driver_by_name( const char *name );

gboolean display_set_driver( display_driver_t driver );

extern uint32_t pvr2_frame_counter;

extern display_driver_t display_driver;

extern struct display_driver display_agl_driver;

extern struct display_driver display_gtk_driver;

extern struct display_driver display_null_driver;

/****************** Input methods **********************/

typedef void (*input_key_callback_t)( void *data, uint32_t value, gboolean isKeyDown );

gboolean input_register_key( const gchar *keysym, input_key_callback_t callback,

			     void *data, uint32_t value );

void input_unregister_key( const gchar *keysym, input_key_callback_t callback,

			   void *data, uint32_t value );

gboolean input_is_key_valid( const gchar *keysym );

gboolean input_is_key_registered( const gchar *keysym );

void input_event_keydown( uint16_t keycode );

void input_event_keyup( uint16_t keycode );

#ifdef __cplusplus

}

#endif

#endif