sdl_gemvideo.c

Simple DirectMedia Layer - Simple DirectMedia Layer 是一个跨平台的多媒体库设计用来提供快速图形framebuffer和音频驱动。应用MPEG为软件

	v_show_c(VDI_handle, 1);
}

static void GEM_LockScreen(_THIS)
{
	if (!GEM_locked) {
		/* Reserve memory space, used to be sure of compatibility */
		form_dial( FMD_START, 0,0,0,0, 0,0,VDI_w,VDI_h);
		/* Lock AES */
		wind_update(BEG_UPDATE);
		wind_update(BEG_MCTRL);

		GEM_locked=SDL_TRUE;
	}
}

static void GEM_UnlockScreen(_THIS)
{
	if (GEM_locked) {
		/* 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_shadow;

	GEM_FreeBuffers(this);

	/*--- 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;
	}

	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);
	}

	/*--- Allocate shadow buffer if needed ---*/
	use_shadow=SDL_FALSE;
	if (flags & SDL_FULLSCREEN) {
		if (!VDI_screen) {
			/* No access to real framebuffer, use shadow surface */
			use_shadow=SDL_TRUE;
		} else {
			if (VDI_format==VDI_FORMAT_INTER) {
				/* Real framebuffer, interleaved bitplanes,
				  use shadow surface */
				use_shadow=SDL_TRUE;
			} else if (flags & SDL_DOUBLEBUF) {
				/* Real framebuffer, double-buffered,
				  use shadow surface */
				use_shadow=SDL_TRUE;
				modeflags |= SDL_DOUBLEBUF;
			}
		}
	} else {
		/* Windowed mode, always with shadow surface */
		use_shadow=SDL_TRUE;
	}

	if (use_shadow) {
		screensize = width * height * VDI_pixelsize;

		GEM_buffer = Atari_SysMalloc(screensize, MX_PREFTTRAM);
		if (GEM_buffer==NULL) {
			fprintf(stderr,"Unable to allocate shadow buffer\n");
			return NULL;
		}
		memset(GEM_buffer, 0, screensize);
	}

	/*--- Initialize screen ---*/
	modeflags = 0;
	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_shadow) {
			modeflags |= SDL_HWSURFACE;
		} else {
			modeflags |= SDL_SWSURFACE;
		}
	} else {
		int posx,posy;
		short x2,y2,w2,h2;

		GEM_UnlockScreen(this);

		/* Center our window */
		posx = GEM_desk_x;
		posy = GEM_desk_y;
		if (width<GEM_desk_w)
			posx += (GEM_desk_w - width) >> 1;
		if (height<GEM_desk_h)
			posy += (GEM_desk_h - height) >> 1;

		/* Calculate our window size and position */
		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;
		}

		if (!wind_calc(0, GEM_win_type, posx, posy, width, height, &x2, &y2, &w2, &h2)) {
			GEM_FreeBuffers(this);
			fprintf(stderr,"Can not calculate window attributes\n");
			return NULL;
		}

		/* Create window */
		GEM_handle=wind_create(GEM_win_type, x2, y2, w2, h2);
		if (GEM_handle<0) {
			GEM_FreeBuffers(this);
			fprintf(stderr,"Can not create window\n");
			return NULL;
		}

		/* 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);
	
		/* Open the window */
		wind_open(GEM_handle,x2,y2,w2,h2);

		modeflags |= SDL_SWSURFACE;
	}

	/* Set up the new mode framebuffer */
	current->flags = modeflags;
	current->w = width;
	current->h = height;
	if (use_shadow) {
		current->pixels = GEM_buffer;
		current->pitch = width * (VDI_bpp >> 3);
	} else {
		current->pixels = VDI_screen;
		current->pixels += VDI_pitch * ((VDI_h - height) >> 1);
		current->pixels += VDI_pixelsize * ((VDI_w - width) >> 1);
		current->pitch = VDI_pitch;
	}

	this->UpdateRects = GEM_UpdateRects;

	/* We're done */
	return(current);
}

/* We don't actually allow hardware surfaces other than the main one */
static int GEM_AllocHWSurface(_THIS, SDL_Surface *surface)
{
	return -1;
}
static void GEM_FreeHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}

/* We need to wait for vertical retrace on page flipped displays */
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;
	MFDB mfdb_src;
	short blitcoords[8];
	int i;

	surface = this->screen;

	if (VDI_screen) {
		if (VDI_format==VDI_FORMAT_INTER) {
			void *destscr;
			int destx;
			
			destscr = VDI_screen;
			destscr += VDI_pitch * ((VDI_h - surface->h) >> 1);
			destx = (VDI_w - surface->w) >> 1;
			destx &= ~15;
			destscr += destx;

			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 += VDI_pitch * rects[i].y;
				destination += x1;

				/* Convert chunky to planar screen */
				Atari_C2pConvert(
					source,
					destination,
					x2-x1,
					rects[i].h,
					SDL_FALSE,
					surface->pitch,
					VDI_pitch
				);

			}

			return;
		}

		if (!(surface->flags & SDL_DOUBLEBUF)) {
			return;
		}
	}

	mfdb_src.fd_addr=surface->pixels;
	mfdb_src.fd_w=surface->w;
	mfdb_src.fd_h=surface->h;
	mfdb_src.fd_wdwidth=(surface->w) >> 4;
	mfdb_src.fd_stand=0;
	mfdb_src.fd_nplanes=surface->format->BitsPerPixel;
	mfdb_src.fd_r1=0;
	mfdb_src.fd_r2=0;
	mfdb_src.fd_r3=0;

	for ( i=0; i<numrects; ++i ) {
		blitcoords[0] = rects[i].x;
		blitcoords[1] = rects[i].y;
		blitcoords[2] = blitcoords[0] + rects[i].w - 1;
		blitcoords[3] = blitcoords[1] + rects[i].h - 1;

		blitcoords[4] = rects[i].x + ((VDI_w - surface->w) >> 1);
		blitcoords[5] = rects[i].y + ((VDI_h - surface->h) >> 1);
		blitcoords[6] = blitcoords[4] + rects[i].w - 1;
		blitcoords[7] = blitcoords[5] + 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[8], wind_pxy[8];
	int i;

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

	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;

	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)
{
	MFDB mfdb_src;
	short blitcoords[8];

	if (VDI_screen) {
		if (VDI_format==VDI_FORMAT_INTER) {
			void *destscr;
			int destx;
			
			/* Center on destination screen */
			destscr = VDI_screen;
			destscr += VDI_pitch * ((VDI_h - surface->h) >> 1);
			destx = (VDI_w - surface->w) >> 1;
			destx &= ~15;
			destscr += destx;

			/* Convert chunky to planar screen */
			Atari_C2pConvert(
				surface->pixels,
				destscr,
				surface->w,
				surface->h,
				SDL_FALSE,
				surface->pitch,
				VDI_pitch
			);

			return(0);
		}

		if (!(surface->flags & SDL_DOUBLEBUF)) {
			return(0);
		}
	}
	
	mfdb_src.fd_addr=surface->pixels;
	mfdb_src.fd_w=surface->w;
	mfdb_src.fd_h=surface->h;
	mfdb_src.fd_wdwidth=(surface->w) >> 4;
	mfdb_src.fd_stand=0;
	mfdb_src.fd_nplanes=surface->format->BitsPerPixel;
	mfdb_src.fd_r1=0;
	mfdb_src.fd_r2=0;
	mfdb_src.fd_r3=0;

	blitcoords[0] = 0;
	blitcoords[1] = 0;
	blitcoords[2] = surface->w - 1;
	blitcoords[3] = surface->h - 1;
	blitcoords[4] = (VDI_w - surface->w) >> 1;
	blitcoords[5] = (VDI_h - surface->h) >> 1;
	blitcoords[6] = blitcoords[4] + surface->w - 1;
	blitcoords[7] = blitcoords[5] + 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 (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;

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

	GEM_UnlockScreen(this);

	appl_exit();

	/* Restore palette */
	if (VDI_oldnumcolors) {
		int i;

		for(i = 0; i < VDI_oldnumcolors; i++) {
			short	rgb[3];

			rgb[0] = VDI_oldpalette[i][0];
			rgb[1] = VDI_oldpalette[i][1];
			rgb[2] = VDI_oldpalette[i][2];

			vs_color(VDI_handle, i, rgb);
		}
	}

	/* 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 */
	wind_get(winhandle, WF_FIRSTXYWH, &todo[0], &todo[1], &todo[2], &todo[3]);

	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);
		}

		wind_get(winhandle, WF_NEXTXYWH, &todo[0], &todo[1], &todo[2], &todo[3]);
	}

	/* 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];
	int iconified;
	SDL_Surface *surface;

	surface=this->screen;

	/* Is window iconified ? */
	iconified = 0;
	if (GEM_wfeatures & (1<<WF_ICONIFY)) {
		wind_get(winhandle, WF_ICONIFY, &wind_pxy[0], &wind_pxy[1], &wind_pxy[2], &wind_pxy[3]);
		iconified = pxy[0];
	}

	wind_get(winhandle, WF_WORKXYWH, &wind_pxy[0], &wind_pxy[1], &wind_pxy[2], &wind_pxy[3]);

	if (iconified) {
		/* Refresh icon */
		mfdb_src.fd_addr=surface->pixels;	/* Should be icon image */
		mfdb_src.fd_w=surface->w;
		mfdb_src.fd_h=surface->h;
		mfdb_src.fd_wdwidth=mfdb_src.fd_w>>4;
	  	mfdb_src.fd_stand=0;
  		mfdb_src.fd_nplanes=surface->format->BitsPerPixel;
		mfdb_src.fd_r1=0;
  		mfdb_src.fd_r2=0;
	  	mfdb_src.fd_r3=0;
	} else {
		/* Refresh window */
		mfdb_src.fd_addr=surface->pixels;
		mfdb_src.fd_w=surface->w;
		mfdb_src.fd_h=surface->h;
		mfdb_src.fd_wdwidth=mfdb_src.fd_w>>4;
	  	mfdb_src.fd_stand=0;
  		mfdb_src.fd_nplanes=surface->format->BitsPerPixel;
		mfdb_src.fd_r1=0;
  		mfdb_src.fd_r2=0;
	  	mfdb_src.fd_r3=0;
	}

	pxy[0] = rect[0] - wind_pxy[0];
	pxy[1] = rect[1] - wind_pxy[1];
 	pxy[2] = pxy[0] + rect[2] - rect[0];   
 	pxy[3] = pxy[1] + rect[3] - rect[1];  

	pxy[4] = rect[0];
	pxy[5] = rect[1];
	pxy[6] = rect[2];  
	pxy[7] = rect[3];

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