/*

     SDL - Simple DirectMedia Layer

     Copyright (C) 1997-2004 Sam Lantinga

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

     modify it under the terms of the GNU Library General Public

     License as published by the Free Software Foundation; either

     version 2 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

     Library General Public License for more details.

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

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

     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

     Sam Lantinga

     slouken@libsdl.org

 */

 #ifdef SAVE_RCSID

 static char rcsid =

  "@(#) $Id$";

 #endif

 /*

 	GEM video driver

 	Patrice Mandin

 	and work from

 	Olivier Landemarre, Johan Klockars, Xavier Joubert, Claude Attard

 */

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

 /* Mint includes */

 #include <gem.h>

 #include <gemx.h>

 #include <mint/osbind.h>

 #include <mint/cookie.h>

 #include "SDL.h"

 #include "SDL_error.h"

 #include "SDL_video.h"

 #include "SDL_mouse.h"

 #include "SDL_endian.h"

 #include "SDL_sysvideo.h"

 #include "SDL_pixels_c.h"

 #include "SDL_events_c.h"

 #include "SDL_cursor_c.h"

 #include "SDL_ataric2p_s.h"

 #include "SDL_atarieddi_s.h"

 #include "SDL_atarimxalloc_c.h"

 #include "SDL_atarigl_c.h"

 #include "SDL_gemvideo.h"

 #include "SDL_gemevents_c.h"

 #include "SDL_gemmouse_c.h"

 #include "SDL_gemwm_c.h"

 #include "SDL_xbiosevents_c.h"

 /* Defines */

 /*#define DEBUG_VIDEO_GEM	1*/

 #define GEM_VID_DRIVER_NAME "gem"

 #undef MIN

 #define MIN(a,b) (((a)<(b)) ? (a) : (b))

 #undef MAX

 #define MAX(a,b) (((a)>(b)) ? (a) : (b))

 /* Variables */

 static unsigned char vdi_index[256] = {

 	0,  2,  3,  6,  4,  7,  5,   8,

 	9, 10, 11, 14, 12, 15, 13, 255

 };

 static const unsigned char empty_name[]="";

 /* Initialization/Query functions */

 static int GEM_VideoInit(_THIS, SDL_PixelFormat *vformat);

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

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

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

 static void GEM_VideoQuit(_THIS);

 /* Hardware surface functions */

 static int GEM_AllocHWSurface(_THIS, SDL_Surface *surface);

 static int GEM_LockHWSurface(_THIS, SDL_Surface *surface);

 static int GEM_FlipHWSurface(_THIS, SDL_Surface *surface);

 static void GEM_UnlockHWSurface(_THIS, SDL_Surface *surface);

 static void GEM_FreeHWSurface(_THIS, SDL_Surface *surface);

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

 #if 0

 static int GEM_ToggleFullScreen(_THIS, int on);

 #endif

 /* Internal functions */

 static void GEM_FreeBuffers(_THIS);

 static void GEM_ClearScreen(_THIS);

 static void GEM_ClearRect(_THIS, short *rect);

 static void GEM_SetNewPalette(_THIS, Uint16 newpal[256][3]);

 static void GEM_LockScreen(_THIS);

 static void GEM_UnlockScreen(_THIS);

 static void refresh_window(_THIS, int winhandle, short *rect);

 #ifdef HAVE_OPENGL

 /* OpenGL functions */

 static void GEM_GL_SwapBuffers(_THIS);

 #endif

 /* GEM driver bootstrap functions */

 static int GEM_Available(void)

 {

 	/* Test if AES available */

 	if (appl_init() == -1)

 		return 0;

 	appl_exit();

 	return 1;

 }

 static void GEM_DeleteDevice(SDL_VideoDevice *device)

 {

 	free(device->hidden);

 	free(device);

 }

 static SDL_VideoDevice *GEM_CreateDevice(int devindex)

 {

 	SDL_VideoDevice *device;

 	int vectors_mask;

 	unsigned long dummy;

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

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

 	if ( device ) {

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

 		device->hidden = (struct SDL_PrivateVideoData *)

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

 		device->gl_data = (struct SDL_PrivateGLData *)

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

 	}

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

 		SDL_OutOfMemory();

 		if ( device ) {

 			free(device);

 		}

 		return(0);

 	}

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

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

 	/* Set the function pointers */

 	device->VideoInit = GEM_VideoInit;

 	device->ListModes = GEM_ListModes;

 	device->SetVideoMode = GEM_SetVideoMode;

 	device->SetColors = GEM_SetColors;

 	device->UpdateRects = NULL /*GEM_UpdateRects*/;

 	device->VideoQuit = GEM_VideoQuit;

 	device->AllocHWSurface = GEM_AllocHWSurface;

 	device->LockHWSurface = GEM_LockHWSurface;

 	device->UnlockHWSurface = GEM_UnlockHWSurface;

 	device->FlipHWSurface = GEM_FlipHWSurface;

 	device->FreeHWSurface = GEM_FreeHWSurface;

 	device->ToggleFullScreen = NULL /*GEM_ToggleFullScreen*/;

 	/* Window manager */

 	device->SetCaption = GEM_SetCaption;

 	device->SetIcon = GEM_SetIcon;

 	device->IconifyWindow = GEM_IconifyWindow;

 	device->GrabInput = GEM_GrabInput;

 	/* Events */

 	device->InitOSKeymap = GEM_InitOSKeymap;

 	device->PumpEvents = GEM_PumpEvents;

 	/* Mouse */

 	device->FreeWMCursor = GEM_FreeWMCursor;

 	device->CreateWMCursor = GEM_CreateWMCursor;

 	device->ShowWMCursor = GEM_ShowWMCursor;

 	device->WarpWMCursor = NULL /*GEM_WarpWMCursor*/;

 	device->CheckMouseMode = GEM_CheckMouseMode;

 #ifdef HAVE_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 = GEM_GL_SwapBuffers;

 #endif

 	/* Joystick + Mouse relative motion */

 	vectors_mask = ATARI_XBIOS_MOUSEEVENTS|ATARI_XBIOS_JOYSTICKEVENTS;

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

 		vectors_mask = 0;

 	}

 	SDL_AtariXbios_InstallVectors(vectors_mask);

 	device->free = GEM_DeleteDevice;

 	return device;

 }

 VideoBootStrap GEM_bootstrap = {

 	GEM_VID_DRIVER_NAME, "Atari GEM video driver",

 	GEM_Available, GEM_CreateDevice

 };

 static void VDI_ReadExtInfo(_THIS, short *work_out)

 {

 	unsigned long EdDI_version;

 	unsigned long cookie_EdDI;

 	Uint32 num_colours;

 	Uint16 clut_type, num_bits;

 	/* Read EdDI informations */

 	if  (Getcookie(C_EdDI, &cookie_EdDI) == C_NOTFOUND) {

 		return;

 	}

 	EdDI_version = Atari_get_EdDI_version( (void *)cookie_EdDI);

 	vq_scrninfo(VDI_handle, work_out);

 	VDI_format = work_out[0];

 	clut_type = work_out[1];

 	num_bits = work_out[2];

 	num_colours = *((Uint32 *) &work_out[3]);

 	/* With EdDI>=1.1, we can have screen pitch, address and format

 	 * so we can directly write to screen without using vro_cpyfm

 	 */

 	if (EdDI_version >= EDDI_11) {

 		VDI_pitch = work_out[5];

 		VDI_screen = (void *) *((unsigned long *) &work_out[6]);

 	}

 	switch(clut_type) {

 		case VDI_CLUT_HARDWARE:

 			{

 				int i;

 				Uint16 *tmp_p;

 				tmp_p = (Uint16 *)&work_out[16];

 				for (i=0;i<256;i++) {

 					vdi_index[*tmp_p++] = i;

 				}

 			}

 			break;

 		case VDI_CLUT_SOFTWARE:

 			{

 				int component; /* red, green, blue, alpha, overlay */

 				int num_bit;

 				unsigned short *tmp_p;

 				/* We can build masks with info here */

 				tmp_p = (unsigned short *) &work_out[16];

 				for (component=0;component<5;component++) {

 					for (num_bit=0;num_bit<16;num_bit++) {

 						unsigned short valeur;

 						valeur = *tmp_p++;

 						if (valeur == 0xffff) {

 							continue;

 						}

 						switch(component) {

 							case 0:

 								VDI_redmask |= 1<< valeur;

 								break;

 							case 1:

 								VDI_greenmask |= 1<< valeur;

 								break;

 							case 2:

 								VDI_bluemask |= 1<< valeur;

 								break;

 							case 3:

 								VDI_alphamask |= 1<< valeur;

 								break;

 						}

 					}

 				}

 			}

 			/* Remove lower green bits for Intel endian screen */

 			if ((VDI_greenmask == ((7<<13)|3)) || (VDI_greenmask == ((7<<13)|7))) {

 				VDI_greenmask &= ~(7<<13);

 			}

 			break;

 		case VDI_CLUT_NONE:

 			break;

 	}

 }

 int GEM_VideoInit(_THIS, SDL_PixelFormat *vformat)

 {

 	int i, menubar_size;

 	short work_in[12], work_out[272], dummy;

 	/* Open AES (Application Environment Services) */

 	if (appl_init() == -1) {

 		fprintf(stderr,"Can not open AES\n");

 		return 1;

 	}

 	/* Read version and features */

 	GEM_version = aes_global[0];

 	if (GEM_version >= 0x0410) {

 		short ap_gout[4], errorcode;

 		GEM_wfeatures=0;

 		errorcode=appl_getinfo(AES_WINDOW, &ap_gout[0], &ap_gout[1], &ap_gout[2], &ap_gout[3]);

 		if (errorcode==0) {

 			GEM_wfeatures=ap_gout[0];			

 		}

 	}	

 	/* Ask VDI physical workstation handle opened by AES */

 	VDI_handle = graf_handle(&dummy, &dummy, &dummy, &dummy);

 	if (VDI_handle<1) {

 		fprintf(stderr,"Wrong VDI handle %d returned by AES\n",VDI_handle);

 		return 1;

 	}

 	/* Open virtual VDI workstation */

 	work_in[0]=Getrez()+2;

 	for(i = 1; i < 10; i++)

 		work_in[i] = 1;

 	work_in[10] = 2;

 	v_opnvwk(work_in, &VDI_handle, work_out);

 	if (VDI_handle == 0) {

 		fprintf(stderr,"Can not open VDI virtual workstation\n");

 		return 1;

 	}

 	/* Read fullscreen size */

 	VDI_w = work_out[0] + 1;

 	VDI_h = work_out[1] + 1;

 	/* Read desktop size and position */

 	if (!wind_get(DESKTOP_HANDLE, WF_WORKXYWH, &GEM_desk_x, &GEM_desk_y, &GEM_desk_w, &GEM_desk_h)) {

 		fprintf(stderr,"Can not read desktop properties\n");

 		return 1;

 	}

 	/* Read bit depth */

 	vq_extnd(VDI_handle, 1, work_out);

 	VDI_bpp = work_out[4];

 	VDI_oldnumcolors=0;

 	switch(VDI_bpp) {

 		case 8:

 			VDI_pixelsize=1;

 			break;

 		case 15:

 		case 16:

 			VDI_pixelsize=2;

 			break;

 		case 24:

 			VDI_pixelsize=3;

 			break;

 		case 32:

 			VDI_pixelsize=4;

 			break;

 		default:

 			fprintf(stderr,"%d bits colour depth not supported\n",VDI_bpp);

 			return 1;

 	}

 	/* Setup hardware -> VDI palette mapping */

 	for(i = 16; i < 255; i++) {

 		vdi_index[i] = i;

 	}

 	vdi_index[255] = 1;

 	/* Save current palette */

 	if (VDI_bpp>8) {

 		VDI_oldnumcolors=1<<8;

 	} else {

 		VDI_oldnumcolors=1<<VDI_bpp;

 	}

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

 		short rgb[3];

 		vq_color(VDI_handle, i, 0, rgb);

 		VDI_oldpalette[i][0] = rgb[0];

 		VDI_oldpalette[i][1] = rgb[1];

 		VDI_oldpalette[i][2] = rgb[2];

 	}

 	VDI_setpalette = GEM_SetNewPalette;

 	memcpy(VDI_curpalette,VDI_oldpalette,sizeof(VDI_curpalette));

 	/* Setup screen info */

 	GEM_title_name = empty_name;

 	GEM_icon_name = empty_name;

 	GEM_handle = -1;

 	GEM_locked = SDL_FALSE;

 	GEM_win_fulled = SDL_FALSE;

 	GEM_fullscreen = SDL_FALSE;

 	GEM_lock_redraw = SDL_TRUE;	/* Prevent redraw till buffers are setup */

 	VDI_screen = NULL;

 	VDI_pitch = VDI_w * VDI_pixelsize;

 	VDI_format = ( (VDI_bpp <= 8) ? VDI_FORMAT_INTER : VDI_FORMAT_PACK);

 	VDI_redmask = VDI_greenmask = VDI_bluemask = VDI_alphamask = 0;

 	VDI_ReadExtInfo(this, work_out);

 #ifdef DEBUG_VIDEO_GEM

 	printf("sdl:video:gem: screen: address=0x%08x, pitch=%d\n", VDI_screen, VDI_pitch);

 	printf("sdl:video:gem: format=%d\n", VDI_format);

 	printf("sdl:video:gem: masks: 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",

 		VDI_alphamask, VDI_redmask, VDI_greenmask, VDI_bluemask

 	);

 #endif

 	/* Setup destination mfdb */

 	VDI_dst_mfdb.fd_addr = NULL;

 	/* Update hardware info */

 	this->info.hw_available = 0;

 	this->info.video_mem = 0;

 	/* Determine the screen depth */

 	/* we change this during the SDL_SetVideoMode implementation... */

 	vformat->BitsPerPixel = VDI_bpp;

 	/* Set mouse cursor to arrow */

 	graf_mouse(ARROW, NULL);

 	/* Init chunky to planar routine */

 	SDL_Atari_C2pConvert = SDL_Atari_C2pConvert8;

 	/* Setup VDI fill functions */

 	vsf_color(VDI_handle,0);

 	vsf_interior(VDI_handle,1);

 	vsf_perimeter(VDI_handle,0);

 	/* Menu bar save buffer */

 	menubar_size = GEM_desk_w * GEM_desk_y * VDI_pixelsize;

 	GEM_menubar=Atari_SysMalloc(menubar_size,MX_PREFTTRAM);

 	/* Fill video modes list */

 	SDL_modelist[0] = malloc(sizeof(SDL_Rect));

 	SDL_modelist[0]->x = 0;

 	SDL_modelist[0]->y = 0;

 	SDL_modelist[0]->w = VDI_w;

 	SDL_modelist[0]->h = VDI_h;

 	SDL_modelist[1] = NULL;

 #ifdef HAVE_OPENGL

 	SDL_AtariGL_InitPointers(this);

 #endif

 	/* We're done! */

 	return(0);

 }

 SDL_Rect **GEM_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

 {

 	if (format->BitsPerPixel != VDI_bpp) {

 		return ((SDL_Rect **)NULL);

 	}

 	if (flags & SDL_FULLSCREEN) {

 		return (SDL_modelist);

 	}

 	return((SDL_Rect **)-1);

 }

 static void GEM_FreeBuffers(_THIS)

 {

 	/* Release buffer */

 	if ( GEM_buffer2 ) {

 		Mfree( GEM_buffer2 );

 		GEM_buffer2=NULL;

 	}

 	if ( GEM_buffer1 ) {

 		Mfree( GEM_buffer1 );

 		GEM_buffer1=NULL;

 	}

 }

 static void GEM_ClearRect(_THIS, short *rect)

 {

 	short oldrgb[3], rgb[3]={0,0,0};

 	vq_color(VDI_handle, vdi_index[0], 0, oldrgb);

 	vs_color(VDI_handle, vdi_index[0], rgb);

 	vsf_color(VDI_handle,0);

 	vsf_interior(VDI_handle,1);

 	vsf_perimeter(VDI_handle,0);

 	v_bar(VDI_handle, rect);

 	vs_color(VDI_handle, vdi_index[0], oldrgb);

 }

 static void GEM_ClearScreen(_THIS)

 {

 	short pxy[4];

 	v_hide_c(VDI_handle);

 	pxy[0] = pxy[1] = 0;

 	pxy[2] = VDI_w - 1;

 	pxy[3] = VDI_h - 1;

 	GEM_ClearRect(this, pxy);

 	v_show_c(VDI_handle, 1);

 }

 static void GEM_SetNewPalette(_THIS, Uint16 newpal[256][3])

 {

 	int i;

 	short rgb[3];

 	if (VDI_oldnumcolors==0)

 		return;

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

 		rgb[0] = newpal[i][0];

 		rgb[1] = newpal[i][1];

 		rgb[2] = newpal[i][2];

 		vs_color(VDI_handle, i, rgb);

 	}

 }

 static void GEM_LockScreen(_THIS)

 {

 	if (!GEM_locked) {

 		/* Lock AES */

 		wind_update(BEG_UPDATE);

 		wind_update(BEG_MCTRL);

 		/* Reserve memory space, used to be sure of compatibility */

 		form_dial( FMD_START, 0,0,0,0, 0,0,VDI_w,VDI_h);

 		/* Save menu bar */

 		if (GEM_menubar) {

 			MFDB mfdb_src;

 			short blitcoords[8];

 			mfdb_src.fd_addr=GEM_menubar;

 			mfdb_src.fd_w=GEM_desk_w;

 			mfdb_src.fd_h=GEM_desk_y;

 			mfdb_src.fd_wdwidth=GEM_desk_w>>4;

 			mfdb_src.fd_nplanes=VDI_bpp;

 			mfdb_src.fd_stand=

 				mfdb_src.fd_r1=

 				mfdb_src.fd_r2=

 				mfdb_src.fd_r3= 0;

 			blitcoords[0] = blitcoords[4] = 0;

 			blitcoords[1] = blitcoords[5] = 0;

 			blitcoords[2] = blitcoords[6] = GEM_desk_w-1;

 			blitcoords[3] = blitcoords[7] = GEM_desk_y-1;

 			vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &VDI_dst_mfdb, &mfdb_src);

 		}

 		GEM_locked=SDL_TRUE;

 	}

 }

 static void GEM_UnlockScreen(_THIS)

 {

 	if (GEM_locked) {

 		/* Restore menu bar */

 		if (GEM_menubar) {

 			MFDB mfdb_src;

 			short blitcoords[8];

 			mfdb_src.fd_addr=GEM_menubar;

 			mfdb_src.fd_w=GEM_desk_w;

 			mfdb_src.fd_h=GEM_desk_y;

 			mfdb_src.fd_wdwidth=GEM_desk_w>>4;

 			mfdb_src.fd_nplanes=VDI_bpp;

 			mfdb_src.fd_stand=

 				mfdb_src.fd_r1=

 				mfdb_src.fd_r2=

 				mfdb_src.fd_r3= 0;

 			blitcoords[0] = blitcoords[4] = 0;

 			blitcoords[1] = blitcoords[5] = 0;

 			blitcoords[2] = blitcoords[6] = GEM_desk_w-1;

 			blitcoords[3] = blitcoords[7] = GEM_desk_y-1;

 			vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &mfdb_src, &VDI_dst_mfdb);

 		}

 		/* Restore screen memory, and send REDRAW to all apps */

 		form_dial( FMD_FINISH, 0,0,0,0, 0,0,VDI_w,VDI_h);

 		/* Unlock AES */

 		wind_update(END_MCTRL);

 		wind_update(END_UPDATE);

 		GEM_locked=SDL_FALSE;

 	}

 }

 SDL_Surface *GEM_SetVideoMode(_THIS, SDL_Surface *current,

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

 {

 	int maxwidth, maxheight;

 	Uint32 modeflags, screensize;

 	SDL_bool use_shadow1, use_shadow2;

 	/*--- Verify if asked mode can be used ---*/

 	if (flags & SDL_FULLSCREEN) {

 		maxwidth=VDI_w;

 		maxheight=VDI_h;

 	} else {

 		/* Windowed mode */

 		maxwidth=GEM_desk_w;

 		maxheight=GEM_desk_h;

 	}

 	/* width must be multiple of 16, for vro_cpyfm() and c2p_convert() */

 	if ((width & 15) != 0) {

 		width = (width | 15) +1;

 	}

 	if ((maxwidth < width) || (maxheight < height) || (VDI_bpp != bpp)) {

 		SDL_SetError("Couldn't find requested mode in list");

 		return(NULL);

 	}

 	/*--- Allocate the new pixel format for the screen ---*/

 	if ( ! SDL_ReallocFormat(current, VDI_bpp, VDI_redmask, VDI_greenmask, VDI_bluemask, VDI_alphamask) ) {

 		SDL_SetError("Couldn't allocate new pixel format for requested mode");

 		return(NULL);

 	}

 	screensize = width * height * VDI_pixelsize;

 #ifdef DEBUG_VIDEO_GEM

 	printf("sdl:video:gem: setvideomode(): %dx%dx%d = %d\n", width, height, bpp, screensize);

 #endif

 	/*--- Allocate shadow buffers if needed, and conversion operations ---*/

 	GEM_FreeBuffers(this);

 	GEM_bufops=0;

 	use_shadow1=use_shadow2=SDL_FALSE;

 	if (VDI_screen && (flags & SDL_FULLSCREEN)) {

 		if (VDI_format==VDI_FORMAT_INTER) {

 			use_shadow1=SDL_TRUE;

 			GEM_bufops = B2S_C2P_1TOS;

 		}

 	} else {

 		use_shadow1=SDL_TRUE;

 		if (VDI_format==VDI_FORMAT_PACK) {

 			GEM_bufops = B2S_VROCPYFM_1TOS;

 		} else {

 			use_shadow2=SDL_TRUE;

 			GEM_bufops = B2S_C2P_1TO2|B2S_VROCPYFM_2TOS;

 		}

 	}

 	if (use_shadow1) {

 		GEM_buffer1 = Atari_SysMalloc(screensize, MX_PREFTTRAM);

 		if (GEM_buffer1==NULL) {

 			SDL_SetError("Can not allocate %d KB for frame buffer", screensize>>10);

 			return NULL;

 		}

 		memset(GEM_buffer1, 0, screensize);

 #ifdef DEBUG_VIDEO_GEM

 		printf("sdl:video:gem: setvideomode(): allocated buffer 1\n");

 #endif

 	}

 	if (use_shadow2) {

 		GEM_buffer2 = Atari_SysMalloc(screensize, MX_PREFTTRAM);

 		if (GEM_buffer2==NULL) {

 			SDL_SetError("Can not allocate %d KB for shadow buffer", screensize>>10);

 			return NULL;

 		}

 		memset(GEM_buffer2, 0, screensize);

 #ifdef DEBUG_VIDEO_GEM

 		printf("sdl:video:gem: setvideomode(): allocated buffer 2\n");

 #endif

 	}

 	/*--- Initialize screen ---*/

 	modeflags = SDL_PREALLOC;

 	if (VDI_bpp == 8) {

 		modeflags |= SDL_HWPALETTE;

 	}

 	if (flags & SDL_FULLSCREEN) {

 		GEM_LockScreen(this);

 		GEM_ClearScreen(this);

 		modeflags |= SDL_FULLSCREEN;

 		if (VDI_screen && (VDI_format==VDI_FORMAT_PACK) && !use_shadow1) {

 			modeflags |= SDL_HWSURFACE;

 		} else {

 			modeflags |= SDL_SWSURFACE;

 		}

 		GEM_fullscreen = SDL_TRUE;

 	} else {

 		int old_win_type;

 		short x2,y2,w2,h2;

 		GEM_UnlockScreen(this);

 		/* Set window gadgets */

 		old_win_type = GEM_win_type;

 		if (!(flags & SDL_NOFRAME)) {

 			GEM_win_type=NAME|MOVER|CLOSER|SMALLER;

 			if (flags & SDL_RESIZABLE) {

 				GEM_win_type |= FULLER|SIZER;

 				modeflags |= SDL_RESIZABLE;

 			}

 		} else {

 			GEM_win_type=0;

 			modeflags |= SDL_NOFRAME;

 		}

 		modeflags |= SDL_SWSURFACE;

 		/* Recreate window ? only for different widget or non-created window */

 		if ((old_win_type != GEM_win_type) || (GEM_handle < 0)) {

 			/* Calculate window size */

 			if (!wind_calc(WC_BORDER, GEM_win_type, 0,0,width,height, &x2,&y2,&w2,&h2)) {

 				GEM_FreeBuffers(this);

 				SDL_SetError("Can not calculate window attributes");

 				return NULL;

 			}

 			/* Center window */

 			x2 = GEM_desk_x+((GEM_desk_w-w2)>>1);

 			y2 = GEM_desk_y+((GEM_desk_h-h2)>>1);

 			/* Destroy existing window */

 			if (GEM_handle >= 0) {

 				wind_close(GEM_handle);

 				wind_delete(GEM_handle);

 			}

 			/* Create window */

 			GEM_handle=wind_create(GEM_win_type, x2,y2,w2,h2);

 			if (GEM_handle<0) {

 				GEM_FreeBuffers(this);

 				SDL_SetError("Can not create window");

 				return NULL;

 			}

 #ifdef DEBUG_VIDEO_GEM

 			printf("sdl:video:gem: handle=%d\n", GEM_handle);

 #endif

 			/* Setup window name */

 			wind_set(GEM_handle,WF_NAME,(short)(((unsigned long)GEM_title_name)>>16),(short)(((unsigned long)GEM_title_name) & 0xffff),0,0);

 			GEM_refresh_name = SDL_FALSE;

 			/* Open the window */

 			wind_open(GEM_handle,x2,y2,w2,h2);

 		} else {

 			/* Resize window if needed, to fit asked video mode */

 			if (modeflags & SDL_RESIZABLE) {

 				wind_get (GEM_handle, WF_WORKXYWH, &x2,&y2,&w2,&h2);

 				if ((w2&15)!=0) {

 					w2=(w2|15)+1;

 				}

 				if ((w2!=width) || (h2!=height)) {

 					if (wind_calc(WC_BORDER, GEM_win_type, x2,y2,width,height, &x2,&y2,&w2,&h2)) {

 						wind_set (GEM_handle, WF_CURRXYWH, x2,y2,w2,h2);

 					}

 				}

 			}

 		}

 		GEM_fullscreen = SDL_FALSE;

 	}

 	/* Set up the new mode framebuffer */

 	current->w = width;

 	current->h = height;

 	if (use_shadow1) {

 		current->pixels = GEM_buffer1;

 		current->pitch = width * VDI_pixelsize;

 	} else {

 		current->pixels = VDI_screen;

 		current->pitch = VDI_pitch;

 	}

 #ifdef HAVE_OPENGL

 	if (flags & SDL_OPENGL) {

 		if (!SDL_AtariGL_Init(this, current)) {

 			GEM_FreeBuffers(this);

 			SDL_SetError("Can not create OpenGL context");

 			return NULL;

 		}

 		modeflags |= SDL_OPENGL;

 	}

 #endif

 	current->flags = modeflags;

 #ifdef DEBUG_VIDEO_GEM

 	printf("sdl:video:gem: surface: %dx%d\n", current->w, current->h);

 #endif

 	this->UpdateRects = GEM_UpdateRects;

 	GEM_lock_redraw = SDL_FALSE;	/* Enable redraw */

 	/* We're done */

 	return(current);

 }

 static int GEM_AllocHWSurface(_THIS, SDL_Surface *surface)

 {

 	return -1;

 }

 static void GEM_FreeHWSurface(_THIS, SDL_Surface *surface)

 {

 	return;

 }

 static int GEM_LockHWSurface(_THIS, SDL_Surface *surface)

 {

 	return(0);

 }

 static void GEM_UnlockHWSurface(_THIS, SDL_Surface *surface)

 {

 	return;

 }

 static void GEM_UpdateRectsFullscreen(_THIS, int numrects, SDL_Rect *rects)

 {

 	SDL_Surface *surface;

 	int i, surf_width;

 	surface = this->screen;

 	/* Need to be a multiple of 16 pixels */

 	surf_width=surface->w;

 	if ((surf_width & 15) != 0) {

 		surf_width = (surf_width | 15) + 1;

 	}

 	if (GEM_bufops & (B2S_C2P_1TO2|B2S_C2P_1TOS)) {

 		void *destscr;

 		int destpitch;

 		if (GEM_bufops & B2S_C2P_1TOS) {

 			destscr = VDI_screen;

 			destpitch = VDI_pitch;

 		} else {

 			destscr = GEM_buffer2;

 			destpitch = surface->pitch;

 		}

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

 			void *source,*destination;

 			int x1,x2;

 			x1 = rects[i].x & ~15;

 			x2 = rects[i].x+rects[i].w;

 			if (x2 & 15) {

 				x2 = (x2 | 15) +1;

 			}

 			source = surface->pixels;

 			source += surface->pitch * rects[i].y;

 			source += x1;

 			destination = destscr;

 			destination += destpitch * rects[i].y;

 			destination += x1;

 			SDL_Atari_C2pConvert(

 				source, destination,

 				x2-x1, rects[i].h,

 				SDL_FALSE,

 				surface->pitch, destpitch

 			);

 		}

 	}

 	if (GEM_bufops & (B2S_VROCPYFM_1TOS|B2S_VROCPYFM_2TOS)) {

 		MFDB mfdb_src;

 		short blitcoords[8];

 		mfdb_src.fd_addr=surface->pixels;

 		mfdb_src.fd_w=surf_width;

 		mfdb_src.fd_h=surface->h;

 		mfdb_src.fd_wdwidth= (surface->pitch/VDI_pixelsize) >> 4;

 		mfdb_src.fd_nplanes=surface->format->BitsPerPixel;

 		mfdb_src.fd_stand=

 			mfdb_src.fd_r1=

 			mfdb_src.fd_r2=

 			mfdb_src.fd_r3= 0;

 		if (GEM_bufops & B2S_VROCPYFM_2TOS) {

 			mfdb_src.fd_addr=GEM_buffer2;

 		}

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

 			blitcoords[0] = blitcoords[4] = rects[i].x;

 			blitcoords[1] = blitcoords[5] = rects[i].y;

 			blitcoords[2] = blitcoords[6] = rects[i].x + rects[i].w - 1;

 			blitcoords[3] = blitcoords[7] = rects[i].y + rects[i].h - 1;

 			vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &mfdb_src, &VDI_dst_mfdb);

 		}

 	}

 }

 static void GEM_UpdateRectsWindowed(_THIS, int numrects, SDL_Rect *rects)

 {

 	short pxy[4], wind_pxy[4];

 	int i;

 	if (wind_get(GEM_handle, WF_WORKXYWH, &wind_pxy[0], &wind_pxy[1], &wind_pxy[2], &wind_pxy[3])==0) {

 		return;

 	}

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

 		pxy[0] = wind_pxy[0] + rects[i].x;

 		pxy[1] = wind_pxy[1] + rects[i].y;

 		pxy[2] = rects[i].w;

 		pxy[3] = rects[i].h;

 		GEM_wind_redraw(this, GEM_handle, pxy);

 	}

 }

 static void GEM_UpdateRects(_THIS, int numrects, SDL_Rect *rects)

 {

 	SDL_Surface *surface;

 	if (GEM_lock_redraw) {

 		return;

 	}

 	surface = this->screen;

 	if (surface->flags & SDL_FULLSCREEN) {

 		GEM_UpdateRectsFullscreen(this, numrects, rects);

 	} else {

 		GEM_UpdateRectsWindowed(this, numrects, rects);

 	}

 }

 static int GEM_FlipHWSurfaceFullscreen(_THIS, SDL_Surface *surface)

 {

 	int surf_width;

 	/* Need to be a multiple of 16 pixels */

 	surf_width=surface->w;

 	if ((surf_width & 15) != 0) {

 		surf_width = (surf_width | 15) + 1;

 	}

 	if (GEM_bufops & (B2S_C2P_1TO2|B2S_C2P_1TOS)) {

 		void *destscr;

 		int destpitch;

 		if (GEM_bufops & B2S_C2P_1TOS) {

 			destscr = VDI_screen;

 			destpitch = VDI_pitch;

 		} else {

 			destscr = GEM_buffer2;

 			destpitch = surface->pitch;

 		}

 		SDL_Atari_C2pConvert(

 			surface->pixels, destscr,

 			surf_width, surface->h,

 			SDL_FALSE,

 			surface->pitch, destpitch

 		);

 	}

 	if (GEM_bufops & (B2S_VROCPYFM_1TOS|B2S_VROCPYFM_2TOS)) {

 		MFDB mfdb_src;

 		short blitcoords[8];

 		mfdb_src.fd_w=surf_width;

 		mfdb_src.fd_h=surface->h;

 		mfdb_src.fd_wdwidth=mfdb_src.fd_w >> 4;

 		mfdb_src.fd_nplanes=surface->format->BitsPerPixel;

 		mfdb_src.fd_stand=

 			mfdb_src.fd_r1=

 			mfdb_src.fd_r2=

 			mfdb_src.fd_r3= 0;

 		if (GEM_bufops & B2S_VROCPYFM_1TOS) {

 			mfdb_src.fd_addr=surface->pixels;

 		} else {

 			mfdb_src.fd_addr=GEM_buffer2;

 		}

 		blitcoords[0] = blitcoords[4] = 0;

 		blitcoords[1] = blitcoords[5] = 0;

 		blitcoords[2] = blitcoords[6] = surface->w - 1;

 		blitcoords[3] = blitcoords[7] = surface->h - 1;

 		vro_cpyfm(VDI_handle, S_ONLY, blitcoords, &mfdb_src, &VDI_dst_mfdb);

 	}

 	return(0);

 }

 static int GEM_FlipHWSurfaceWindowed(_THIS, SDL_Surface *surface)

 {

 	short	pxy[8];

 	/* Update the whole window */

 	wind_get(GEM_handle, WF_WORKXYWH, &pxy[0], &pxy[1], &pxy[2], &pxy[3]);

 	GEM_wind_redraw(this, GEM_handle, pxy);

 	return(0);

 }

 static int GEM_FlipHWSurface(_THIS, SDL_Surface *surface)

 {

 	if (GEM_lock_redraw) {

 		return(0);

 	}

 	if (surface->flags & SDL_FULLSCREEN) {

 		return GEM_FlipHWSurfaceFullscreen(this, surface);

 	} else {

 		return GEM_FlipHWSurfaceWindowed(this, surface);

 	}

 }

 static int GEM_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

 {

 	int i;

 	SDL_Surface *surface;

 #ifdef DEBUG_VIDEO_GEM

 	printf("sdl:video:gem: setcolors()\n");

 #endif

 	/* Do not change palette in True Colour */

 	surface = this->screen;

 	if (surface->format->BitsPerPixel > 8) {

 		return 1;

 	}

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

 	{

 		int		r, g, b;

 		short	rgb[3];

 		r = colors[i].r;

 		g = colors[i].g;

 		b = colors[i].b;

 		rgb[0] = VDI_curpalette[i][0] = (1000 * r) / 255;

 		rgb[1] = VDI_curpalette[i][1] =(1000 * g) / 255;

 		rgb[2] = VDI_curpalette[i][2] =(1000 * b) / 255;

 		vs_color(VDI_handle, vdi_index[firstcolor+i], rgb);

 	}

 	return(1);

 }

 #if 0

 static int GEM_ToggleFullScreen(_THIS, int on)

 {

 	if (on) {

 		GEM_LockScreen(this);

 	} else {

 		GEM_UnlockScreen(this);

 	}

 	return(1);

 }

 #endif

 /* Note:  If we are terminated, this could be called in the middle of

    another SDL video routine -- notably UpdateRects.

 */

 void GEM_VideoQuit(_THIS)

 {

 	SDL_AtariXbios_RestoreVectors();

 	GEM_FreeBuffers(this);

 #ifdef HAVE_OPENGL

 	if (gl_active) {

 		SDL_AtariGL_Quit(this, SDL_TRUE);

 	}

 #endif

 	/* Destroy window */

 	if (GEM_handle>=0) {

 		wind_close(GEM_handle);

 		wind_delete(GEM_handle);

 		GEM_handle=-1;

 	}

 	GEM_UnlockScreen(this);

 	if (GEM_menubar) {

 		Mfree(GEM_menubar);

 		GEM_menubar=NULL;

 	}

 	appl_exit();

 	GEM_SetNewPalette(this, VDI_oldpalette);

 	/* Close VDI workstation */

 	if (VDI_handle) {

 		v_clsvwk(VDI_handle);

 	}

 	/* Free mode list */

 	if (SDL_modelist[0]) {

 		free(SDL_modelist[0]);

 		SDL_modelist[0]=NULL;

 	}

 	this->screen->pixels = NULL;	

 }

 void GEM_wind_redraw(_THIS, int winhandle, short *inside)

 {

 	short todo[4];

 	/* Tell AES we are going to update */

 	wind_update(BEG_UPDATE);

 	v_hide_c(VDI_handle);

 	/* Browse the rectangle list to redraw */

 	if (wind_get(winhandle, WF_FIRSTXYWH, &todo[0], &todo[1], &todo[2], &todo[3])!=0) {

 		while (todo[2] && todo[3]) {

 			if (rc_intersect((GRECT *)inside,(GRECT *)todo)) {

 				todo[2] += todo[0]-1;

 				todo[3] += todo[1]-1;

 				refresh_window(this, winhandle, todo);

 			}

 			if (wind_get(winhandle, WF_NEXTXYWH, &todo[0], &todo[1], &todo[2], &todo[3])==0) {

 				break;

 			}

 		}

 	}

 	/* Update finished */

 	wind_update(END_UPDATE);

 	v_show_c(VDI_handle,1);

 }

 static void refresh_window(_THIS, int winhandle, short *rect)

 {

 	MFDB mfdb_src;

 	short pxy[8],wind_pxy[8];

 	SDL_Surface *surface;

 	int iconified;

 	/* Is window iconified ? */

 	iconified = 0;

 /*	if (GEM_wfeatures & (1<<WF_ICONIFY))*/ {

 		if (wind_get(winhandle, WF_ICONIFY, &wind_pxy[0], &wind_pxy[1], &wind_pxy[2], &wind_pxy[3])!=0) {

 			iconified = wind_pxy[0];

 		}

 	}

 	if (wind_get(winhandle, WF_WORKXYWH, &wind_pxy[0], &wind_pxy[1], &wind_pxy[2], &wind_pxy[3])==0) {

 		return;

 	}

 	if (iconified && GEM_icon) {

 		short icon_rect[4], dst_rect[4];

 		short iconx,icony;

 		surface = GEM_icon;

 		GEM_ClearRect(this, rect);

 		/* Calculate centered icon(x,y,w,h) relative to window */

 		iconx = (wind_pxy[2]-surface->w)>>1;

 		icony = (wind_pxy[3]-surface->h)>>1;

 		icon_rect[0] = iconx;

 		icon_rect[1] = icony;

 		icon_rect[2] = surface->w;

 		icon_rect[3] = surface->h;

 		/* Calculate redraw rectangle(x,y,w,h) relative to window */

 		dst_rect[0] = rect[0]-wind_pxy[0];

 		dst_rect[1] = rect[1]-wind_pxy[1];

 		dst_rect[2] = rect[2]-rect[0]+1;

 		dst_rect[3] = rect[3]-rect[1]+1;

 		/* Does the icon rectangle must be redrawn ? */

 		if (!rc_intersect((GRECT *)icon_rect, (GRECT *)dst_rect)) {

 			return;

 		}

 #if DEBUG_VIDEO_GEM

 		printf("sdl:video:gem:  clip(0,0,%d,%d) to (%d,%d,%d,%d)\n",

 			surface->w-1,surface->h-1, dst_rect[0],dst_rect[1],dst_rect[2],dst_rect[3]);

 		printf("sdl:video:gem:  icon(%d,%d,%d,%d)\n",

 			icon_rect[0], icon_rect[1], icon_rect[2], icon_rect[3]);

 		printf("sdl:video:gem: refresh_window(): draw icon\n");

 #endif

 		/* Calculate icon(x1,y1,x2,y2) relative to screen */

 		icon_rect[0] += wind_pxy[0];

 		icon_rect[1] += wind_pxy[1];

 		icon_rect[2] += icon_rect[0]-1;

 		icon_rect[3] += icon_rect[1]-1;

 		/* Calculate intersection rectangle to redraw */

 		pxy[4]=pxy[0]=MAX(icon_rect[0],rect[0]);

 		pxy[5]=pxy[1]=MAX(icon_rect[1],rect[1]);

  		pxy[6]=pxy[2]=MIN(icon_rect[2],rect[2]);

 	 	pxy[7]=pxy[3]=MIN(icon_rect[3],rect[3]);

 		/* Calculate icon source image pos relative to window */

 		pxy[0] -= wind_pxy[0]+iconx;

 		pxy[1] -= wind_pxy[1]+icony;

 		pxy[2] -= wind_pxy[0]+iconx;

 		pxy[3] -= wind_pxy[1]+icony;

 	} else {

 		surface = this->screen;

 #if DEBUG_VIDEO_GEM

 		printf("sdl:video:gem: refresh_window(): draw frame buffer\n");

 #endif

 		/* Redraw all window content */

 		pxy[0] = rect[0]-wind_pxy[0];

 		pxy[1] = rect[1]-wind_pxy[1];

 	 	pxy[2] = rect[2]-wind_pxy[0];   

 	 	pxy[3] = rect[3]-wind_pxy[1];  

 		pxy[4] = rect[0];

 		pxy[5] = rect[1];

 		pxy[6] = rect[2];  

 		pxy[7] = rect[3];

 	}

 	if (GEM_bufops & B2S_C2P_1TO2) {

 		void *src, *dest;

 		int x1,x2;

 		x1 = (rect[0]-wind_pxy[0]) & ~15;

 		x2 = rect[2]-wind_pxy[0];

 		if (x2 & 15) {

 			x2 = (x2 | 15) +1;

 		}

 		src = surface->pixels;

 		src += surface->pitch * (rect[1]-wind_pxy[1]);

 		src += x1;

 		dest = GEM_buffer2;

 		dest += surface->pitch * (rect[1]-wind_pxy[1]);

 		dest += x1;

 		SDL_Atari_C2pConvert(

 			src, dest,

 			x2-x1, rect[3]-rect[1]+1,

 			SDL_FALSE,

 			surface->pitch, surface->pitch

 		);

 	}

 	mfdb_src.fd_addr=surface->pixels;

 	{

 		int width;

 		/* Need to be a multiple of 16 pixels */

 		width=surface->w;

 		if ((width & 15) != 0) {

 			width = (width | 15) + 1;

 		}

 		mfdb_src.fd_w=width;

 	}

 	mfdb_src.fd_h=surface->h;

   	mfdb_src.fd_nplanes=surface->format->BitsPerPixel;

 	mfdb_src.fd_wdwidth=mfdb_src.fd_w>>4;

 	mfdb_src.fd_stand=

 		mfdb_src.fd_r1=

   		mfdb_src.fd_r2=

 	  	mfdb_src.fd_r3= 0;

 	if (GEM_bufops & B2S_VROCPYFM_2TOS) {

 		mfdb_src.fd_addr=GEM_buffer2;

 	}

 #if DEBUG_VIDEO_GEM

 	printf("sdl:video:gem: redraw %dx%d: (%d,%d,%d,%d) to (%d,%d,%d,%d)\n",

 		surface->w, surface->h,

 		pxy[0],pxy[1],pxy[2],pxy[3],

 		pxy[4],pxy[5],pxy[6],pxy[7]

 	);

 #endif

 	vro_cpyfm( VDI_handle, S_ONLY, pxy, &mfdb_src, &VDI_dst_mfdb);

 }

 #ifdef HAVE_OPENGL

 static void GEM_GL_SwapBuffers(_THIS)

 {

 	SDL_AtariGL_SwapBuffers(this);

 	GEM_FlipHWSurface(this, this->screen);

 }

 #endif