/**

  * $Id$

  *

  * 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

 #if HAVE_GLES2

 #include <GLES2/gl2.h>

 #include <GLES2/gl2ext.h>

 #else

 #include <GL/gl.h>

 #include <GL/glext.h>

 #endif

 #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; /* Colour format that the dreamcast expects the data to be in */

     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;

     gboolean has_sl;

     gboolean has_bgra;

     int depth_bits;

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

 };

 struct vertex_buffer {

     /**

      * Map the buffer into the host address space (if necessary) in preparation

      * for filling the buffer. This also implies a fence operation.

      * @param buf previously allocated buffer

      * @param size number of bytes of the buffer actually to be used. The buffer

      * will be resized if necessary.

      * @return a pointer to the start of the buffer.

      */

     void *(*map)(vertex_buffer_t buf, uint32_t size);

     /**

      * Unmap the buffer, after the vertex data is written.

      * @return the buffer base to use for gl*Pointer calls

      */

     void *(*unmap)(vertex_buffer_t buf);

     /**

      * Mark the buffer as finished, indicating that the vertex data is no

      * longer required (ie rendering is complete).

      */

     void (*finished)(vertex_buffer_t buf);

     /**

      * Delete the buffer and all associated resources.

      */

     void (*destroy)(vertex_buffer_t buf);

     /* Private data */

     void *data;

     GLuint id;

     uint32_t capacity;

     uint32_t mapped_size;

     GLuint fence;

 };

 /**

  * 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 );

     /**

      * Create a new vertex buffer

      */

     vertex_buffer_t (*create_vertex_buffer)( );

     /**

      * 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_gl_driver;

 extern struct display_driver display_egl_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 */