/**

 * $Id$

 *

 * 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 lxdream_display_H

#define lxdream_display_H 1

#define GL_GLEXT_PROTOTYPES 1

#include <stdint.h>

#include <stdio.h>

#include <glib.h>

#include "lxdream.h"

#include "gettext.h"

#include "config.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) */

/**

 * The standard display size (for the purposes of mouse inputs, etc, is 640x480 -

 * events should be adjusted accordingly if this is not the actual window size.

 */ 

#define DISPLAY_WIDTH 640

#define DISPLAY_HEIGHT 480

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;

    uint32_t 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 */

    uint32_t scale;

    GLuint tex_id;    /* texture bound to render buffer, if any (0 = none). 

                       * The render buffer does not own the texture */

    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;

    uint32_t 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;

};

struct display_capabilities {

    gboolean has_gl;

    int stencil_bits; /* 0 = no stencil buffer */

};

/**

 * 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;

    /**

     * Short (<60 chars) description of the driver. This should be marked for

     * localization.

     */

    char *description;

    /**

     * 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 );

    /**

     * Given a device-specific event code, return the corresponding keysym.

     * The string should be newly allocated (caller will free)

     */

    gchar *(*get_keysym_for_keycode)( uint16_t keycode );

    /**

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

     * is supplied (non-zero), the render buffer writes its output to that texture.

     * @param tex_id 0 or a valid GL texture name which must have been initialized to

     * the correct dimensions. 

     */

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

    /**

     * 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 );

    /**

     * Complete rendering and clear the current rendering target. If the 

     * buffer has a bound texture, it will be updated if necessary.

     */

    void (*finish_render)( 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.

     */

    void (*display_render_buffer)( render_buffer_t buffer );

    /**

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

     * entire frame (specified in BGR888 format). 

     */

    void (*display_blank)( uint32_t rgb );

    /**

     * Swap front/back window buffers

     */

    void (*swap_buffers)();

    /**

     * 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 );

    /**

     * Dump driver-specific information about the implementation to the given stream

     */

    void (*print_info)( FILE *out );

    struct display_capabilities capabilities;

} *display_driver_t;

/**

 * Print the configured video drivers to the output stream, one to a line.

 */

void print_display_drivers( FILE *out );

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_gtk_driver;

extern struct display_driver display_osx_driver;

extern struct display_driver display_null_driver;

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

#define MAX_MOUSE_BUTTONS 32

/* Pressure is 0..127  (allowing a joystick to be defined as two half-axes of 7- bits each) */

#define MAX_PRESSURE 0x7F

typedef key_binding_t input_key_callback_t;

/**

 * 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).

 * @param absolute If TRUE, x and y are the current window coordinates 

 *  of the mouse cursor. Otherwise, x and y are deltas from the previous mouse position.

 */

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

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_register_keygroup( lxdream_config_group_t group );

void input_unregister_keygroup( lxdream_config_group_t group );

gboolean input_keygroup_changed( void *data, lxdream_config_group_t group, unsigned key,

                             const gchar *oldval, const gchar *newval );

/**

 * Register a hook to receive all keyboard input events

 */

gboolean input_register_keyboard_hook( input_key_callback_t callback, void *data );

void input_unregister_keyboard_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 );

uint16_t input_keycode_to_dckeysym( uint16_t keycode );

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

/**

 * Auxilliary input driver - provides input separate to and in addition to the

 * core UI/display. (primarily used for joystick devices)

 */

typedef struct input_driver {

    const char *id; /* Short identifier to display in the UI for the device (eg "JS0" ) */

    /**

     * 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)( struct input_driver *driver, const gchar *keysym );

    /**

     * Given a device-specific event code, convert it to a dreamcast keyboard code.

     * This is only required for actual keyboard devices, other devices should just

     * leave this method NULL.

     */

    uint16_t (*convert_to_dckeysym)( struct input_driver *driver, uint16_t keycode );

    /**

     * Given a device-specific event code, return the corresponding keysym.

     * The string should be newly allocated (caller will free)

     */

    gchar *(*get_keysym_for_keycode)( struct input_driver *driver, uint16_t keycode );

    /**

     * Destroy the input driver.

     */

    void (*destroy)( struct input_driver *driver );

} *input_driver_t;       

extern struct input_driver system_mouse_driver;

/**

 * Register a new input driver (which must have a unique name)

 * @param driver the driver to register

 * @param max_keycode the highest possible keycode reported by the device

 * @return TRUE on success, FALSE on failure (eg driver already registed).

 */

gboolean input_register_device( input_driver_t driver, uint16_t max_keycode );

/**

 * Determine if the system has an input driver with the given unique ID.

 * @param id driver id to check

 * @return TRUE if the device exists, otherwise FALSE

 */

gboolean input_has_device( const gchar *id );

/**

 * Unregister an input driver.

 * @param driver the driver to unregister

 * If the driver is not in fact registered, this function has no effect.

 */

void input_unregister_device( input_driver_t driver );

/**

 * Called from the UI to indicate that the emulation window is focused (ie

 * able to receive input). This method is used to gate non-UI input devices -

 * when the display is not focused, all input events will be silently ignored.

 */

void display_set_focused( gboolean has_focus );

/**

 * Fire a keydown event on the specified device

 * @param input The input device source generating the event, or NULL for the 

 *        default GUI device

 * @param keycode The device-specific keycode

 * @param pressure The pressure of the key (0 to 127), where 0 is unpressed and

 *        127 is maximum pressure. Devices without pressure sensitivity should 

 *        always use MAX_PRESSURE (127) 

 */

void input_event_keydown( input_driver_t input, uint16_t keycode, uint32_t pressure );

void input_event_keyup( input_driver_t input, uint16_t keycode );

/**

 * Receive an input mouse down event. Normally these should be absolute events when

 * the mouse is not grabbed, and relative when it is.

 * @param button the button pressed, where 0 == first button

 * @param x_axis The relative or absolute position of the mouse cursor on the X axis

 * @param y_axis The relative or absolute position of the mouse cursor on the Y axis

 * @param absolute If TRUE, x_axis and y_axis are the current window coordinates 

 *  of the mouse cursor. Otherwise, x_axis and y_axis are deltas from the previous mouse position.

 */

void input_event_mousedown( uint16_t button, int32_t x_axis, int32_t y_axis, gboolean absolute );

/**

 * Receive an input mouse up event. Normally these should be absolute events when

 * the mouse is not grabbed, and relative when it is.

 * @param button the button released, where 0 == first button

 * @param x_axis The relative or absolute position of the mouse cursor on the X axis

 * @param y_axis The relative or absolute position of the mouse cursor on the Y axis

 * @param absolute If TRUE, x_axis and y_axis are the current window coordinates 

 *  of the mouse cursor. Otherwise, x_axis and y_axis are deltas from the previous mouse position.

 */

void input_event_mouseup( uint16_t button, int32_t x_axis, int32_t y_axis, gboolean absolute );

/**

 * Receive an input mouse motion event. Normally these should be absolute events when

 * the mouse is not grabbed, and relative when it is.

 * @param x_axis The relative or absolute position of the mouse cursor on the X axis

 * @param y_axis The relative or absolute position of the mouse cursor on the Y axis

 * @param absolute If TRUE, x_axis and y_axis are the current window coordinates 

 *  of the mouse cursor. Otherwise, x_axis and y_axis are deltas from the previous mouse position.

 */

void input_event_mousemove( int32_t x_axis, int32_t y_axis, gboolean absolute );

/**

 * Given a keycode and the originating input driver, return the corresponding 

 * keysym. The caller is responsible for freeing the string.

 * @return a newly allocated string, or NULL of the keycode is unresolvable.

 */

gchar *input_keycode_to_keysym( input_driver_t driver, uint16_t keycode );

typedef void (*display_keysym_callback_t)( void *data, const gchar *keysym );

/**

 * Set the keysym hook function (normally used by the UI to receive non-UI

 * input events during configuration.

 */

void input_set_keysym_hook( display_keysym_callback_t hook, void *data );

#ifdef __cplusplus

}

#endif

#endif /* !lxdream_display_H */