/*

     SDL - Simple DirectMedia Layer

     Copyright (C) 1997-2006 Sam Lantinga

     This library is free software; you can redistribute it and/or

     modify it under the terms of the GNU Lesser General Public

     License as published by the Free Software Foundation; either

     version 2.1 of the License, or (at your option) any later version.

     This library 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

     Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public

     License along with this library; if not, write to the Free Software

     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

     Sam Lantinga

     slouken@libsdl.org

 */

 /*

  *	Atari keyboard events manager, using BIOS

  *

  *	Patrice Mandin

  */

 #include <string.h>

 /* Mint includes */

 #include <mint/osbind.h>

 #include <mint/cookie.h>

 #include "SDL.h"

 #include "SDL_sysevents.h"

 #include "SDL_events_c.h"

 #include "SDL_atarikeys.h"

 #include "SDL_atarievents_c.h"

 #include "SDL_xbiosevents_c.h"

 /* To save state of keyboard */

 #define ATARIBIOS_MAXKEYS 128

 static unsigned char bios_currentkeyboard[ATARIBIOS_MAXKEYS];

 static unsigned char bios_previouskeyboard[ATARIBIOS_MAXKEYS];

 static unsigned char bios_currentascii[ATARIBIOS_MAXKEYS];

 /* Special keys state */

 enum {

 	K_RSHIFT=0,

 	K_LSHIFT,

 	K_CTRL,

 	K_ALT,

 	K_CAPSLOCK,

 	K_CLRHOME,

 	K_INSERT

 };

 /* The translation tables from a console scancode to a SDL keysym */

 static SDLKey keymap[ATARIBIOS_MAXKEYS];

 static SDL_keysym *TranslateKey(int scancode, int asciicode, SDL_keysym *keysym,

 	SDL_bool pressed);

 static void UpdateSpecialKeys(int special_keys_state);

 void AtariBios_InitOSKeymap(_THIS)

 {

 	int i, vectors_mask;

 	unsigned long dummy;

 	SDL_memset(bios_currentkeyboard, 0, sizeof(bios_currentkeyboard));

 	SDL_memset(bios_previouskeyboard, 0, sizeof(bios_previouskeyboard));

 	/* Initialize keymap */

 	for ( i=0; i<sizeof(keymap); i++ )

 		keymap[i] = SDLK_UNKNOWN;

 	/* Functions keys */

 	for ( i = 0; i<10; i++ )

 		keymap[SCANCODE_F1 + i] = SDLK_F1+i;

 	/* Cursor keypad */

 	keymap[SCANCODE_HELP] = SDLK_HELP;

 	keymap[SCANCODE_UNDO] = SDLK_UNDO;

 	keymap[SCANCODE_INSERT] = SDLK_INSERT;

 	keymap[SCANCODE_CLRHOME] = SDLK_HOME;

 	keymap[SCANCODE_UP] = SDLK_UP;

 	keymap[SCANCODE_DOWN] = SDLK_DOWN;

 	keymap[SCANCODE_RIGHT] = SDLK_RIGHT;

 	keymap[SCANCODE_LEFT] = SDLK_LEFT;

 	/* Special keys */

 	keymap[SCANCODE_ESCAPE] = SDLK_ESCAPE;

 	keymap[SCANCODE_BACKSPACE] = SDLK_BACKSPACE;

 	keymap[SCANCODE_TAB] = SDLK_TAB;

 	keymap[SCANCODE_ENTER] = SDLK_RETURN;

 	keymap[SCANCODE_DELETE] = SDLK_DELETE;

 	keymap[SCANCODE_LEFTCONTROL] = SDLK_LCTRL;

 	keymap[SCANCODE_LEFTSHIFT] = SDLK_LSHIFT;

 	keymap[SCANCODE_RIGHTSHIFT] = SDLK_RSHIFT;

 	keymap[SCANCODE_LEFTALT] = SDLK_LALT;

 	keymap[SCANCODE_CAPSLOCK] = SDLK_CAPSLOCK;

 	vectors_mask = ATARI_XBIOS_MOUSEEVENTS|ATARI_XBIOS_JOYSTICKEVENTS;

 	if (Getcookie(C_MiNT, &dummy)==C_FOUND) {

 		vectors_mask = 0;

 	}

 	SDL_AtariXbios_InstallVectors(vectors_mask);

 }

 void AtariBios_PumpEvents(_THIS)

 {

 	int i;

 	SDL_keysym keysym;

 	/* Update pressed keys */

 	SDL_memset(bios_currentkeyboard, 0, ATARIBIOS_MAXKEYS);

 	while (Bconstat(_CON)) {

 		unsigned long key_pressed;

 		unsigned char asciicode, scancode;

 		key_pressed=Bconin(_CON);

 		asciicode = key_pressed;

 		scancode = key_pressed >> 16;

 		bios_currentkeyboard[scancode]=0xFF;

 		bios_currentascii[scancode]=asciicode;

 	}

 	/* Read special keys */

 	UpdateSpecialKeys(Kbshift(-1));

 	/* Now generate events */

 	for (i=0; i<ATARIBIOS_MAXKEYS; i++) {

 		/* Key pressed ? */

 		if (bios_currentkeyboard[i] && !bios_previouskeyboard[i])

 			SDL_PrivateKeyboard(SDL_PRESSED,

 				TranslateKey(i, bios_currentascii[i], &keysym, SDL_TRUE));

 		/* Key unpressed ? */

 		if (bios_previouskeyboard[i] && !bios_currentkeyboard[i])

 			SDL_PrivateKeyboard(SDL_RELEASED,

 				TranslateKey(i, bios_currentascii[i], &keysym, SDL_FALSE));

 	}

 	SDL_AtariXbios_PostMouseEvents(this, SDL_TRUE);

 	/* Will be previous table */

 	SDL_memcpy(bios_previouskeyboard, bios_currentkeyboard, ATARIBIOS_MAXKEYS);

 }

 static void UpdateSpecialKeys(int special_keys_state)

 {

 #define UPDATE_SPECIAL_KEYS(numbit,scancode) \

 	{	\

 		if (special_keys_state & (1<<(numbit))) { \

 			bios_currentkeyboard[scancode]=0xFF; \

 			bios_currentascii[scancode]=0; \

 		}	\

 	}

 	UPDATE_SPECIAL_KEYS(K_RSHIFT, SCANCODE_RIGHTSHIFT);

 	UPDATE_SPECIAL_KEYS(K_LSHIFT, SCANCODE_LEFTSHIFT);

 	UPDATE_SPECIAL_KEYS(K_CTRL, SCANCODE_LEFTCONTROL);

 	UPDATE_SPECIAL_KEYS(K_ALT, SCANCODE_LEFTALT);

 	UPDATE_SPECIAL_KEYS(K_CAPSLOCK, SCANCODE_CAPSLOCK);

 }

 static SDL_keysym *TranslateKey(int scancode, int asciicode, SDL_keysym *keysym,

 	SDL_bool pressed)

 {

 	/* Set the keysym information */

 	keysym->scancode = scancode;

 	if (asciicode)

 		keysym->sym = asciicode;		

 	else

 		keysym->sym = keymap[scancode];

 	keysym->mod = KMOD_NONE;

 	keysym->unicode = 0;

 	if (SDL_TranslateUNICODE && pressed) {

 		keysym->unicode = SDL_AtariToUnicodeTable[asciicode];

 	}

 	return(keysym);

 }

 void AtariBios_ShutdownEvents(void)

 {

 	SDL_AtariXbios_RestoreVectors();

 }