/*

    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

*/

#include "SDL_config.h"

/*

 * Xbios SDL video driver

 * 

 * Patrice Mandin

 */

#include <sys/stat.h>

#include <unistd.h>

/* Mint includes */

#include <mint/cookie.h>

#include <mint/osbind.h>

#include <mint/falcon.h>

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../../events/SDL_events_c.h"

#include "../ataricommon/SDL_ataric2p_s.h"

#include "../ataricommon/SDL_atarievents_c.h"

#include "../ataricommon/SDL_atarimxalloc_c.h"

#include "../ataricommon/SDL_atarigl_c.h"

#include "SDL_xbios.h"

#include "SDL_xbios_blowup.h"

#include "SDL_xbios_centscreen.h"

#include "SDL_xbios_sb3.h"

#include "SDL_xbios_tveille.h"

#define XBIOS_VID_DRIVER_NAME "xbios"

/* Debug print info */

#if 0

#define DEBUG_PRINT(what) \

	{ \

		printf what; \

	}

#define DEBUG_VIDEO_XBIOS 1

#else

#define DEBUG_PRINT(what)

#undef DEBUG_VIDEO_XBIOS

#endif

/* Initialization/Query functions */

static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat);

static SDL_Rect **XBIOS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

static SDL_Surface *XBIOS_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

static int XBIOS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);

static void XBIOS_VideoQuit(_THIS);

/* Hardware surface functions */

static int XBIOS_AllocHWSurface(_THIS, SDL_Surface *surface);

static int XBIOS_LockHWSurface(_THIS, SDL_Surface *surface);

static int XBIOS_FlipHWSurface(_THIS, SDL_Surface *surface);

static void XBIOS_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void XBIOS_FreeHWSurface(_THIS, SDL_Surface *surface);

static void XBIOS_UpdateRects(_THIS, int numrects, SDL_Rect *rects);

#if SDL_VIDEO_OPENGL

/* OpenGL functions */

static void XBIOS_GL_SwapBuffers(_THIS);

#endif

/* To setup palette */

static unsigned short	TT_palette[256];

static unsigned long	F30_palette[256];

/* Xbios driver bootstrap functions */

static int XBIOS_Available(void)

{

	unsigned long cookie_vdo, cookie_mil, cookie_hade, cookie_scpn;

	/* Milan/Hades Atari clones do not have an Atari video chip */

	if ( (Getcookie(C__MIL, &cookie_mil) == C_FOUND) ||

		(Getcookie(C_hade, &cookie_hade) == C_FOUND) ) {

		return 0;

	}

	/* Cookie _VDO present ? if not, assume ST machine */

	if (Getcookie(C__VDO, &cookie_vdo) != C_FOUND) {

		cookie_vdo = VDO_ST << 16;

	}

	/* Test if we have a monochrome monitor plugged in */

	switch( cookie_vdo >>16) {

		case VDO_ST:

		case VDO_STE:

			if ( Getrez() == (ST_HIGH>>8) )

				return 0;

			break;

		case VDO_TT:

			if ( (EgetShift() & ES_MODE) == TT_HIGH)

				return 0;

			break;

		case VDO_F30:

			if ( VgetMonitor() == MONITOR_MONO)

				return 0;

			if (Getcookie(C_SCPN, &cookie_scpn) == C_FOUND) {

				if (!SDL_XBIOS_SB3Usable((scpn_cookie_t *)cookie_scpn)) {

					return 0;

				}

			}

			break;

		default:

			return 0;

	}

	return 1;

}

static void XBIOS_DeleteDevice(SDL_VideoDevice *device)

{

	SDL_free(device->hidden);

	SDL_free(device);

}

static SDL_VideoDevice *XBIOS_CreateDevice(int devindex)

{

	SDL_VideoDevice *device;

	/* Initialize all variables that we clean on shutdown */

	device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));

	if ( device ) {

		SDL_memset(device, 0, (sizeof *device));

		device->hidden = (struct SDL_PrivateVideoData *)

				SDL_malloc((sizeof *device->hidden));

		device->gl_data = (struct SDL_PrivateGLData *)

				SDL_malloc((sizeof *device->gl_data));

	}

	if ( (device == NULL) || (device->hidden == NULL) ) {

		SDL_OutOfMemory();

		if ( device ) {

			SDL_free(device);

		}

		return(0);

	}

	SDL_memset(device->hidden, 0, (sizeof *device->hidden));

	SDL_memset(device->gl_data, 0, sizeof(*device->gl_data));

	/* Video functions */

	device->VideoInit = XBIOS_VideoInit;

	device->ListModes = XBIOS_ListModes;

	device->SetVideoMode = XBIOS_SetVideoMode;

	device->SetColors = XBIOS_SetColors;

	device->UpdateRects = NULL;

	device->VideoQuit = XBIOS_VideoQuit;

	device->AllocHWSurface = XBIOS_AllocHWSurface;

	device->LockHWSurface = XBIOS_LockHWSurface;

	device->UnlockHWSurface = XBIOS_UnlockHWSurface;

	device->FlipHWSurface = XBIOS_FlipHWSurface;

	device->FreeHWSurface = XBIOS_FreeHWSurface;

#if SDL_VIDEO_OPENGL

	/* OpenGL functions */

	device->GL_LoadLibrary = SDL_AtariGL_LoadLibrary;

	device->GL_GetProcAddress = SDL_AtariGL_GetProcAddress;

	device->GL_GetAttribute = SDL_AtariGL_GetAttribute;

	device->GL_MakeCurrent = SDL_AtariGL_MakeCurrent;

	device->GL_SwapBuffers = XBIOS_GL_SwapBuffers;

#endif

	/* Events */

	device->InitOSKeymap = Atari_InitOSKeymap;

	device->PumpEvents = Atari_PumpEvents;

	device->free = XBIOS_DeleteDevice;

	return device;

}

VideoBootStrap XBIOS_bootstrap = {

	XBIOS_VID_DRIVER_NAME, "Atari Xbios driver",

	XBIOS_Available, XBIOS_CreateDevice

};

void SDL_XBIOS_AddMode(_THIS, Uint16 modecode, Uint16 width, Uint16 height,

	Uint16 depth, SDL_bool flags)

{

	int i, curpos;

	xbiosmode_t *current_mode;

	/* Check if mode already exists */

	if (XBIOS_modelist) {

		current_mode = XBIOS_modelist;

		for (i=0;i<XBIOS_nummodes; i++, current_mode++) {

			if (current_mode->width != width)

				continue;

			if (current_mode->height != height)

				continue;

			if (current_mode->depth != depth)

				continue;

			return;

		}

	}

	++XBIOS_nummodes;

	XBIOS_modelist = (xbiosmode_t *) SDL_realloc(XBIOS_modelist, XBIOS_nummodes * sizeof(xbiosmode_t));

	/* Keep the list sorted: bpp, width, height */

	curpos=0;

	for(i=0; i<XBIOS_nummodes-1; i++) {

		if (XBIOS_modelist[i].depth <= depth) {

			if (XBIOS_modelist[i].width < width) {

				break;

			} else if (XBIOS_modelist[i].width == width) {

				if (XBIOS_modelist[i].height <= height) {

					break;

				}

			}

		}

		curpos++;

	}

	/* Push remaining modes further */

	for(i=XBIOS_nummodes-1; i>curpos; i--) {

		SDL_memcpy(&XBIOS_modelist[i], &XBIOS_modelist[i-1], sizeof(xbiosmode_t));

	}

	XBIOS_modelist[curpos].number = modecode;

	XBIOS_modelist[curpos].width = width;

	XBIOS_modelist[curpos].height = height;

	XBIOS_modelist[curpos].depth = depth;

	XBIOS_modelist[curpos].doubleline = flags;

}

static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

	int i,j8,j16;

	xbiosmode_t *current_mode;

	unsigned long cookie_blow, cookie_scpn, cookie_cnts;

	/* Initialize all variables that we clean on shutdown */

	memset (SDL_modelist, 0, sizeof(SDL_modelist));

	/* Cookie _VDO present ? if not, assume ST machine */

	if (Getcookie(C__VDO, &XBIOS_cvdo) != C_FOUND) {

		XBIOS_cvdo = VDO_ST << 16;

	}

	/* Allocate memory for old palette */

	XBIOS_oldpalette = (void *)SDL_malloc(256*sizeof(long));

	if ( !XBIOS_oldpalette ) {

		SDL_SetError("Unable to allocate memory for old palette\n");

		return(-1);

	}

	/* Initialize video mode list */

	/* and save current screen status (palette, screen address, video mode) */

	XBIOS_nummodes = 0;

	XBIOS_modelist = NULL;

	XBIOS_centscreen = SDL_FALSE;

	switch (XBIOS_cvdo >>16) {

		case VDO_ST:

		case VDO_STE:

			{

				short *oldpalette;

				SDL_XBIOS_AddMode(this, ST_LOW>>8,320,200,4,SDL_FALSE);

				XBIOS_oldvbase=Physbase();

				XBIOS_oldvmode=Getrez();

				switch(XBIOS_oldvmode << 8) {

					case ST_LOW:

						XBIOS_oldnumcol=16;

						break;

					case ST_MED:

						XBIOS_oldnumcol=4;

						break;

					case ST_HIGH:

						XBIOS_oldnumcol=2;

						break;

					default:

						XBIOS_oldnumcol=0;

						break;

				}

				oldpalette= (short *) XBIOS_oldpalette;

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

					*oldpalette++=Setcolor(i,-1);

				}

				vformat->BitsPerPixel = 8;

			}

			break;

		case VDO_TT:

			SDL_XBIOS_AddMode(this, TT_LOW,320,480,8,SDL_FALSE);

			/* Software double-lined mode */

			SDL_XBIOS_AddMode(this, TT_LOW,320,240,8,SDL_TRUE);

			XBIOS_oldvbase=Logbase();

			XBIOS_oldvmode=EgetShift();

			switch(XBIOS_oldvmode & ES_MODE) {

				case TT_LOW:

					XBIOS_oldnumcol=256;

					break;

				case ST_LOW:

				case TT_MED:

					XBIOS_oldnumcol=16;

					break;

				case ST_MED:

					XBIOS_oldnumcol=4;

					break;

				case ST_HIGH:

				case TT_HIGH:

					XBIOS_oldnumcol=2;

					break;

				default:

					XBIOS_oldnumcol=0;

					break;

			}

			if (XBIOS_oldnumcol) {

				EgetPalette(0, XBIOS_oldnumcol, XBIOS_oldpalette);

			}

			vformat->BitsPerPixel = 8;

			break;

		case VDO_F30:

			switch (VgetMonitor())

			{

				case MONITOR_MONO:

					/* Not usable */

					break;

				case MONITOR_RGB:

				case MONITOR_TV:

					SDL_XBIOS_AddMode(this, BPS16|COL80|OVERSCAN|VERTFLAG,768,480,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|COL80|OVERSCAN,768,240,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|COL80|VERTFLAG,640,400,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|COL80,640,200,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|OVERSCAN|VERTFLAG,384,480,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|OVERSCAN,384,240,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|VERTFLAG,320,400,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16,320,200,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|COL80|OVERSCAN|VERTFLAG,768,480,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|COL80|OVERSCAN,768,240,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|COL80|VERTFLAG,640,400,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|COL80,640,200,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|OVERSCAN|VERTFLAG,384,480,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|OVERSCAN,384,240,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|VERTFLAG,320,400,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8,320,200,8,SDL_FALSE);

					break;

				case MONITOR_VGA:

					SDL_XBIOS_AddMode(this, BPS16,320,480,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS16|VERTFLAG,320,240,16,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|COL80,640,480,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|COL80|VERTFLAG,640,240,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8,320,480,8,SDL_FALSE);

					SDL_XBIOS_AddMode(this, BPS8|VERTFLAG,320,240,8,SDL_FALSE);

					break;

			}

			XBIOS_oldvbase=Logbase();

			XBIOS_oldvmode=VsetMode(-1);

			XBIOS_oldnumcol= 1<< (1 << (XBIOS_oldvmode & NUMCOLS));

			if (XBIOS_oldnumcol > 256) {

				XBIOS_oldnumcol = 0;

			}

			if (XBIOS_oldnumcol) {

				VgetRGB(0, XBIOS_oldnumcol, XBIOS_oldpalette);

			}

			vformat->BitsPerPixel = 16;

			/* Keep vga/rvb, and pal/ntsc bits */

			current_mode = XBIOS_modelist;

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

				Uint16 newvmode;			

				newvmode = current_mode->number;

				newvmode &= ~(VGA|PAL);

				newvmode |= XBIOS_oldvmode & (VGA|PAL);

				current_mode->number = newvmode;

				current_mode++;

			}

			/* Initialize BlowUp/SB3/Centscreen stuff if present */

			if (Getcookie(C_BLOW, &cookie_blow) == C_FOUND) {

				SDL_XBIOS_BlowupInit(this, (blow_cookie_t *)cookie_blow);

			} else if (Getcookie(C_SCPN, &cookie_scpn) == C_FOUND) {

				SDL_XBIOS_SB3Init(this, (scpn_cookie_t *)cookie_scpn);

			} else if (Getcookie(C_CNTS, &cookie_cnts) == C_FOUND) {

				XBIOS_oldvmode = SDL_XBIOS_CentscreenInit(this);

				XBIOS_centscreen = SDL_TRUE;

			}

			break;

	}

	/* Determine the current screen size */

	if ( XBIOS_nummodes > 0 ) {

		/* FIXME: parse video mode list to search for current mode */

		this->info.current_w = XBIOS_modelist[0].width;

		this->info.current_h = XBIOS_modelist[0].height;

	}

	current_mode = XBIOS_modelist;

	j8 = j16 = 0;

	for (i=0; i<XBIOS_nummodes; i++, current_mode++) {

		switch (current_mode->depth) {

			case 4:

			case 8:

				SDL_modelist[0][j8] = SDL_malloc(sizeof(SDL_Rect));

				SDL_modelist[0][j8]->x = SDL_modelist[0][j8]->y = 0;

				SDL_modelist[0][j8]->w = current_mode->width;

				SDL_modelist[0][j8]->h = current_mode->height;

				XBIOS_videomodes[0][j8]=current_mode;

				j8++;

				break;

			case 16:

				SDL_modelist[1][j16] = SDL_malloc(sizeof(SDL_Rect));

				SDL_modelist[1][j16]->x = SDL_modelist[1][j16]->y = 0;

				SDL_modelist[1][j16]->w = current_mode->width;

				SDL_modelist[1][j16]->h = current_mode->height;

				XBIOS_videomodes[1][j16]=current_mode;

				j16++;

				break;

		}		

	}

	SDL_modelist[0][j8] = NULL;

	SDL_modelist[1][j16] = NULL;

	XBIOS_screens[0]=NULL;

	XBIOS_screens[1]=NULL;

	XBIOS_shadowscreen=NULL;

	/* Update hardware info */

	this->info.hw_available = 1;

	this->info.video_mem = (Uint32) Atari_SysMalloc(-1L, MX_STRAM);

	/* Init chunky to planar routine */

	SDL_Atari_C2pConvert = SDL_Atari_C2pConvert8;

#if SDL_VIDEO_OPENGL

	SDL_AtariGL_InitPointers(this);

#endif

	/* Disable screensavers */

	if (SDL_XBIOS_TveillePresent(this)) {

		SDL_XBIOS_TveilleDisable(this);

	}

	/* We're done! */

	return(0);

}

static SDL_Rect **XBIOS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

	/* 8 bits -> list 0 */

	/* 16 bits -> list 1 */

	if ((format->BitsPerPixel != 8) && (format->BitsPerPixel !=16)) {

		return NULL;

	}

	return(SDL_modelist[(format->BitsPerPixel)>>4]);

}

static void XBIOS_FreeBuffers(_THIS)

{

	int i;

	for (i=0;i<2;i++) {

		if (XBIOS_screensmem[i]!=NULL) {

			Mfree(XBIOS_screensmem[i]);

			XBIOS_screensmem[i]=NULL;

		}

	}

	if (XBIOS_shadowscreen!=NULL) {

		Mfree(XBIOS_shadowscreen);

		XBIOS_shadowscreen=NULL;

	}

}

static SDL_Surface *XBIOS_SetVideoMode(_THIS, SDL_Surface *current,

				int width, int height, int bpp, Uint32 flags)

{

	int mode, new_depth;

	int i;

	xbiosmode_t *new_video_mode;

	Uint32 new_screen_size;

	Uint32 modeflags;

	/* Free current buffers */

	XBIOS_FreeBuffers(this);

	/* Limit bpp */

	if (bpp>16) {

		bpp = 16;

	}

	bpp >>= 4;

	/* Search if the mode exists (width, height, bpp) */

	for ( mode=0; SDL_modelist[bpp][mode]; ++mode ) {

		if ( (SDL_modelist[bpp][mode]->w == width) &&

		     (SDL_modelist[bpp][mode]->h == height) ) {

			break;

		}