sdl_gsvideo.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

		}
	}

	/* We're done! */
	return(0);
}

static SDL_Rect **GS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
	static SDL_Rect GS_vesa_mode_list[] = {
		{ 0, 0, 1280, 1024 },
		{ 0, 0, 1024, 768 },
		{ 0, 0, 800, 600 },
		{ 0, 0, 640, 480 }
	};
	static SDL_Rect *GS_vesa_modes[] = {
		&GS_vesa_mode_list[0],
		&GS_vesa_mode_list[1],
		&GS_vesa_mode_list[2],
		&GS_vesa_mode_list[3],
		NULL
	};
	static SDL_Rect GS_tvout_stretch;
	static SDL_Rect GS_tvout_mode;
	static SDL_Rect *GS_tvout_modes[3];
	SDL_Rect **modes = NULL;

	switch (format->BitsPerPixel) {
	    case 16:
	    case 24:
	    case 32:
		if ( saved_vinfo.mode == PS2_GS_VESA ) {
			modes = GS_vesa_modes;
		} else {
			int i, j = 0;

// FIXME - what's wrong with the stretch code at 16 bpp?
if ( format->BitsPerPixel != 32 ) break;
			/* Add a mode that we could possibly stretch to */
			for ( i=0; GS_vesa_modes[i]; ++i ) {
				if ( (GS_vesa_modes[i]->w == saved_vinfo.w) &&
				     (GS_vesa_modes[i]->h != saved_vinfo.h) ) {
					GS_tvout_stretch.w=GS_vesa_modes[i]->w;
					GS_tvout_stretch.h=GS_vesa_modes[i]->h;
					GS_tvout_modes[j++] = &GS_tvout_stretch;
					break;
				}
			}
			/* Add the current TV video mode */
			GS_tvout_mode.w = saved_vinfo.w;
			GS_tvout_mode.h = saved_vinfo.h;
			GS_tvout_modes[j++] = &GS_tvout_mode;
			GS_tvout_modes[j++] = NULL;

			/* Return the created list of modes */
			modes = GS_tvout_modes;
		}
		break;
	    default:
		break;
	}
	return(modes);
}

/* Various screen update functions available */
static void GS_DMAFullUpdate(_THIS, int numrects, SDL_Rect *rects);

static SDL_Surface *GS_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 flags)
{
	struct ps2_screeninfo vinfo;

	/* Set the terminal into graphics mode */
	if ( GS_EnterGraphicsMode(this) < 0 ) {
		return(NULL);
	}

	/* Set the video mode and get the final screen format */
	if ( ioctl(console_fd, PS2IOC_GSCREENINFO, &vinfo) < 0 ) {
		SDL_SetError("Couldn't get console screen info");
		return(NULL);
	}
	if ( (vinfo.w != width) || (vinfo.h != height) ||
	     (GS_pixelmasks[vinfo.psm].bpp != bpp) ) {
		/* If we're not in VESA mode, we have to scale resolution */
		if ( saved_vinfo.mode == PS2_GS_VESA ) {
			switch (width) {
			    case 640:
				vinfo.res = PS2_GS_640x480;
				break;
			    case 800:
				vinfo.res = PS2_GS_800x600;
				break;
			    case 1024:
				vinfo.res = PS2_GS_1024x768;
				break;
			    case 1280:
				vinfo.res = PS2_GS_1280x1024;
				break;
			    default:
				SDL_SetError("Unsupported resolution: %dx%d\n",
					     width, height);
				return(NULL);
			}
			vinfo.res |= (PS2_GS_75Hz << 8);
			vinfo.w = width;
			vinfo.h = height;
		}
		vinfo.fbp = 0;
		vinfo.psm = GS_formatmap[bpp/8];
		if ( vinfo.psm < 0 ) {
			SDL_SetError("Unsupported depth: %d bpp\n", bpp);
			return(NULL);
		}
		if ( ioctl(console_fd, PS2IOC_SSCREENINFO, &vinfo) < 0 ) {
			SDL_SetError("Couldn't set console screen info");
			return(NULL);
		}

		/* Unmap the previous DMA buffer */
		if ( mapped_mem ) {
			munmap(mapped_mem, mapped_len);
			mapped_mem = NULL;
		}
	}
	if ( ! SDL_ReallocFormat(current, GS_pixelmasks[vinfo.psm].bpp,
	                                  GS_pixelmasks[vinfo.psm].r,
	                                  GS_pixelmasks[vinfo.psm].g,
	                                  GS_pixelmasks[vinfo.psm].b, 0) ) {
		return(NULL);
	}

	/* Set up the new mode framebuffer */
	current->flags = SDL_FULLSCREEN;
	current->w = width;
	current->h = height;
	current->pitch = SDL_CalculatePitch(current);

	/* Memory map the DMA area for block memory transfer */
	if ( ! mapped_mem ) {
		pixels_len = height * current->pitch;
		mapped_len = pixels_len +
		             /* Screen update DMA command area */
		             sizeof(head_tags) + ((2 * MAXTAGS) * 16);
		if ( saved_vinfo.mode != PS2_GS_VESA ) {
			mapped_len += sizeof(tex_tags) + sizeof(scale_tags);
		}
		mapped_mem = mmap(0, mapped_len, PROT_READ|PROT_WRITE,
		                  MAP_SHARED, memory_fd, 0);
		if ( mapped_mem == MAP_FAILED ) {
			SDL_SetError("Unable to map %d bytes for DMA",
			             mapped_len);
			mapped_mem = NULL;
			return(NULL);
		}

		/* Set up the entire screen for DMA transfer */
		screen_image.ptr = mapped_mem;
		screen_image.fbp = 0;
		screen_image.fbw = (vinfo.w + 63) / 64;
		screen_image.psm = vinfo.psm;
		screen_image.x = 0;
		if ( vinfo.h == height ) {
			screen_image.y = 0;
		} else {
			/* Put image offscreen and scale to screen height */
			screen_image.y = vinfo.h;
		}
		screen_image.w = current->w;
		screen_image.h = current->h;

		/* get screen image data size (qword aligned) */
		screen_image_size = (screen_image.w * screen_image.h);
		switch (screen_image.psm) {
		    case PS2_GS_PSMCT32:
			screen_image_size *= 4;
			break;
		    case PS2_GS_PSMCT24:
			screen_image_size *= 3;
			break;
		    case PS2_GS_PSMCT16:
			screen_image_size *= 2;
			break;
		}
		screen_image_size = (screen_image_size + 15) & ~15;

		/* Set up the memory for screen update DMA commands */
		head_tags_mem = (unsigned long long *)
		                (mapped_mem + pixels_len);
		image_tags_mem = (unsigned long long *)
		                 ((caddr_t)head_tags_mem + sizeof(head_tags));
		memcpy(head_tags_mem, head_tags, sizeof(head_tags));
		if ( saved_vinfo.mode != PS2_GS_VESA ) {
			tex_tags_mem = (unsigned long long *)
		                 ((caddr_t)image_tags_mem + ((2*MAXTAGS)*16));
			scale_tags_mem = (unsigned long long *)
		                 ((caddr_t)tex_tags_mem + sizeof(tex_tags));
			memcpy(tex_tags_mem, tex_tags, sizeof(tex_tags));
			tex_tags_mem[2] = 
				(vinfo.h * vinfo.w) / 64 +
	          		((unsigned long long)screen_image.fbw << 14) +
	          		((unsigned long long)screen_image.psm << 20) +
	          		((unsigned long long)power_of_2(screen_image.w) << 26) +
	          		((unsigned long long)power_of_2(screen_image.h) << 30) +
	          		((unsigned long long)1 << 34) +
	          		((unsigned long long)1 << 35);
			memcpy(scale_tags_mem, scale_tags, sizeof(scale_tags));
			scale_tags_mem[8] =
				((unsigned long long)screen_image.w * 16) +
			         (((unsigned long long)screen_image.h * 16) << 16);
			scale_tags_mem[10] =
				((unsigned long long)vinfo.w * 16) +
			         (((unsigned long long)vinfo.h * 16) << 16);
		}
	}
	current->pixels = NULL;
	if ( getenv("SDL_FULLSCREEN_UPDATE") ) {
		/* Correct semantics */
		current->flags |= SDL_ASYNCBLIT;
	} else {
		/* We lie here - the screen memory isn't really the visible
		   display memory and still requires an update, but this
		   has the desired effect for most applications.
		 */
		current->flags |= SDL_HWSURFACE;
	}

	/* Set the update rectangle function */
	this->UpdateRects = GS_DMAFullUpdate;

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

/* We don't support hardware surfaces yet */
static int GS_AllocHWSurface(_THIS, SDL_Surface *surface)
{
	return(-1);
}
static void GS_FreeHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}
static int GS_LockHWSurface(_THIS, SDL_Surface *surface)
{
	if ( surface == this->screen ) {
		/* Since mouse motion affects 'pixels', lock it */
		SDL_LockCursor();

		/* Make sure any pending DMA has completed */
		if ( dma_pending ) {
			ioctl(console_fd, PS2IOC_SENDQCT, 1);
			dma_pending = 0;
		}

		/* If the cursor is drawn on the DMA area, remove it */
		if ( cursor_drawn ) {
			surface->pixels = mapped_mem + surface->offset;
			SDL_EraseCursorNoLock(this->screen);
			cursor_drawn = 0;
		}

		/* Set the surface pixels to the base of the DMA area */
		surface->pixels = mapped_mem;

		/* We're finished! */
		SDL_UnlockCursor();
	}
	return(0);
}
static void GS_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
	if ( surface == this->screen ) {
		/* Since mouse motion affects 'pixels', lock it */
		SDL_LockCursor();
		surface->pixels = NULL;
		SDL_UnlockCursor();
	}
}

static void GS_DMAFullUpdate(_THIS, int numrects, SDL_Rect *rects)
{
	/* Lock so we aren't interrupted by a mouse update */
	SDL_LockCursor();

	/* Make sure any pending DMA has completed */
	if ( dma_pending ) {
		ioctl(console_fd, PS2IOC_SENDQCT, 1);
		dma_pending = 0;
	}

	/* If the mouse is visible, draw it on the DMA area */
	if ( (SDL_cursorstate & CURSOR_VISIBLE) && !cursor_drawn ) {
		this->screen->pixels = mapped_mem + this->screen->offset;
		SDL_DrawCursorNoLock(this->screen);
		this->screen->pixels = NULL;
		cursor_drawn = 1;
	}

	/* Put the image onto the screen */
	loadimage_nonblock(console_fd,
	                   &screen_image, screen_image_size,
	                   head_tags_mem, image_tags_mem);
	if ( screen_image.y > 0 ) {
		/* Need to scale offscreen image to TV output */
		ioctl(console_fd, PS2IOC_SENDQCT, 1);
		dma_pending = 0;
		scaleimage_nonblock(console_fd, tex_tags_mem, scale_tags_mem);
	} else {
		dma_pending = 1;
	}

	/* We're finished! */
	SDL_UnlockCursor();
}

static int GS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
	return(0);
}

static void GS_VideoQuit(_THIS)
{
	/* Close console and input file descriptors */
	if ( console_fd > 0 ) {
		/* Unmap the video framebuffer */
		if ( mapped_mem ) {
			/* Unmap the video framebuffer */
			munmap(mapped_mem, mapped_len);
			mapped_mem = NULL;
		}
		close(memory_fd);

		/* Restore the original video mode */
		if ( GS_InGraphicsMode(this) ) {
			ioctl(console_fd, PS2IOC_SSCREENINFO, &saved_vinfo);
		}

		/* We're all done with the graphics device */
		close(console_fd);
		console_fd = -1;
	}
	GS_CloseMouse(this);
	GS_CloseKeyboard(this);
}