/**

  * $Id$

  *

  * 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 );

     /**

      * Given a native system keycode, convert it to a dreamcast keyboard code.

      */

     uint16_t (*convert_to_dckeysym)( uint16_t keycode );

     /**

      * 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 );

 /**

  * Callback to receive mouse input events

  * @param data pointer passed in at the time the hook was registered

  * @param buttons bitmask of button states, where bit 0 is button 0 (left), bit 1 is button

  * 1 (middle), bit 2 is button 2 (right) and so forth.

  * @param x Horizontal movement since the last invocation (in relative mode) or window position 

  * (in absolute mode).

  * @param y Vertical movement since the last invocation (in relative mode) or window position

  * (in absolute mode).

  */

 typedef void (*input_mouse_callback_t)( void *data, uint32_t buttons, int32_t x, int32_t y );

 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 );

 /**

  * Register a hook to receive all input events

  */

 gboolean input_register_hook( input_key_callback_t callback, void *data );

 void input_unregister_hook( input_key_callback_t callback, void *data );

 /**

  * Register a mouse event hook.

  * @param relative TRUE if the caller wants relative mouse movement, FALSE for

  * absolute mouse positioning. It's not generally possible to receive both at the same time.

  */

 gboolean input_register_mouse_hook( gboolean relative, input_mouse_callback_t callback, void *data );

 void input_unregister_mouse_hook( input_mouse_callback_t callback, void *data );

 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 );

 void input_event_mouse( uint32_t buttons, int32_t x_axis, int32_t y_axis );

 uint16_t input_keycode_to_dckeysym( uint16_t keycode );

 #ifdef __cplusplus

 }

 #endif

 #endif