text: /*
      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"
  
  /*
  	GEM video driver
  
  	Patrice Mandin
  	and work from
  	Olivier Landemarre, Johan Klockars, Xavier Joubert, Claude Attard
  */
  
  /* Mint includes */
  #include <gem.h>
  #include <gemx.h>
  #include <mint/osbind.h>
  #include <mint/cookie.h>
  
  #include "SDL_endian.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 "../SDL_cursor_c.h"
  
  #include "../ataricommon/SDL_ataric2p_s.h"
  #include "../ataricommon/SDL_atarieddi_s.h"
  #include "../ataricommon/SDL_atarimxalloc_c.h"
  #include "../ataricommon/SDL_atarigl_c.h"
  
  #include "SDL_gemvideo.h"
  #include "SDL_gemevents_c.h"
  #include "SDL_gemmouse_c.h"
  #include "SDL_gemwm_c.h"
  #include "../ataricommon/SDL_xbiosevents_c.h"
  #include "../ataricommon/SDL_ataridevmouse_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);
  
  #if SDL_VIDEO_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)
  {
  	SDL_free(device->hidden);
  	SDL_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 *)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));
  
  	/* 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;
  
  #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 = GEM_GL_SwapBuffers;
  #endif
  
  	device->hidden->use_dev_mouse =
  		(SDL_AtariDevMouse_Open()!=0) ? SDL_TRUE : SDL_FALSE;
  
  	vectors_mask = ATARI_XBIOS_JOYSTICKEVENTS;	/* XBIOS joystick events */
  	if (!(device->hidden->use_dev_mouse)) {
  		vectors_mask |= ATARI_XBIOS_MOUSEEVENTS;	/* XBIOS mouse events */
  	}
  /*	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;
  	SDL_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;
  
  	/* Determine the current screen size */
  	this->info.current_w = VDI_w;
  	this->info.current_h = VDI_h;
  
  	/* 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);
  	GEM_cursor = 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] = SDL_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;
  
  #if SDL_VIDEO_OPENGL
  	SDL_AtariGL_InitPointers(this);
  #endif
  
  	this->info.wm_available = 1;
  
  	/* 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)
  {
  	Uint32 modeflags, screensize;
  	SDL_bool use_shadow1, use_shadow2;
  
  	/* width must be multiple of 16, for vro_cpyfm() and c2p_convert() */
  	if ((width & 15) != 0) {
  		width = (width | 15) +1;
  	}
  
  	/*--- Verify if asked mode can be used ---*/
  	if (VDI_bpp != bpp) {
  		SDL_SetError("%d bpp mode not supported", bpp);
  		return(NULL);
  	}
  
  	if (flags & SDL_FULLSCREEN) {
  		if ((VDI_w < width) || (VDI_h < height)) {
  			SDL_SetError("%dx%d mode is too large", width, height);
  			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;
  		}
  		SDL_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;
  		}
  		SDL_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_w-w2)>>1;
  			y2 = (GEM_desk_h-h2)>>1;
  			if (x2<0) {
  				x2 = 0;
  			}
  			if (y2<0) {
  				y2 = 0;
  			}
  			x2 += GEM_desk_x;
  			y2 += GEM_desk_y;
  
  			/* 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 to fit asked video mode */
  			wind_get (GEM_handle, WF_WORKXYWH, &x2,&y2,&w2,&h2);
  			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;
  	}
  
  #if SDL_VIDEO_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();
  	if (GEM_usedevmouse) {
  		SDL_AtariDevMouse_Close();
  	}
  
  	GEM_FreeBuffers(this);
  
  #if SDL_VIDEO_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]) {
  		SDL_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);
  }
  
  #if SDL_VIDEO_OPENGL
  
  static void GEM_GL_SwapBuffers(_THIS)
  {
  	SDL_AtariGL_SwapBuffers(this);
  	GEM_FlipHWSurface(this, this->screen);
  }
  
  #endif
  