/*

    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

*/

/* The high-level video driver subsystem */

#include "SDL.h"

#include "SDL_sysvideo.h"

#include "SDL_blit.h"

#include "SDL_pixels_c.h"

#include "SDL_cursor_c.h"

/* Available video drivers */

static VideoBootStrap *bootstrap[] = {

	&QZ_bootstrap,

#endif

	&X11_bootstrap,

#endif

	&DGA_bootstrap,

#endif

	&NX_bootstrap,

#endif

	&iPod_bootstrap,

#endif

	&Qtopia_bootstrap,

#endif

	&WSCONS_bootstrap,

#endif

	&FBCON_bootstrap,

#endif

	&DirectFB_bootstrap,

#endif

	&PS2GS_bootstrap,

#endif

	&GGI_bootstrap,

#endif

	&VGL_bootstrap,

#endif

	&SVGALIB_bootstrap,

#endif

	&AALIB_bootstrap,

#endif

	&DUMMY_bootstrap,

#endif

	NULL

};

SDL_VideoDevice *current_video = NULL;

/* Various local functions */

int SDL_VideoInit(const char *driver_name, Uint32 flags);

void SDL_VideoQuit(void);

void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect* rects);

static SDL_GrabMode SDL_WM_GrabInputOff(void);

static int lock_count = 0;

#endif

/*

 * Initialize the video and event subsystems -- determine native pixel format

 */

int SDL_VideoInit (const char *driver_name, Uint32 flags)

{

	SDL_VideoDevice *video;

	int index;

	int i;

	SDL_PixelFormat vformat;

	Uint32 video_flags;

	/* Toggle the event thread flags, based on OS requirements */

#if defined(MUST_THREAD_EVENTS)

	flags |= SDL_INIT_EVENTTHREAD;

#elif defined(CANT_THREAD_EVENTS)

	if ( (flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD ) {

		SDL_SetError("OS doesn't support threaded events");

		return(-1);

	}

#endif

	/* Check to make sure we don't overwrite 'current_video' */

	if ( current_video != NULL ) {

		SDL_VideoQuit();

	}

	/* Select the proper video driver */

	index = 0;

	video = NULL;

	if ( driver_name != NULL ) {

#if 0	/* This will be replaced with a better driver selection API */

		if ( SDL_strrchr(driver_name, ':') != NULL ) {

			index = atoi(SDL_strrchr(driver_name, ':')+1);

		}

#endif

		for ( i=0; bootstrap[i]; ++i ) {

			if ( SDL_strncmp(bootstrap[i]->name, driver_name,

			             SDL_strlen(bootstrap[i]->name)) == 0 ) {

				if ( bootstrap[i]->available() ) {

					video = bootstrap[i]->create(index);

					break;

				}

			}

		}

	} else {

		for ( i=0; bootstrap[i]; ++i ) {

			if ( bootstrap[i]->available() ) {

				video = bootstrap[i]->create(index);

				if ( video != NULL ) {

					break;

				}

			}

		}

	}

	if ( video == NULL ) {

		SDL_SetError("No available video device");

		return(-1);

	}

	current_video = video;

	current_video->name = bootstrap[i]->name;

	/* Do some basic variable initialization */

	video->screen = NULL;

	video->shadow = NULL;

	video->visible = NULL;

	video->physpal = NULL;

	video->gammacols = NULL;

	video->gamma = NULL;

	video->wm_title = NULL;

	video->wm_icon  = NULL;

	video->offset_x = 0;

	video->offset_y = 0;

	SDL_memset(&video->info, 0, (sizeof video->info));

	video->displayformatalphapixel = NULL;

	/* Set some very sane GL defaults */

	video->gl_config.driver_loaded = 0;

	video->gl_config.dll_handle = NULL;

	video->gl_config.red_size = 5;

#if 1 /* This seems to work on more video cards, as a default */

	video->gl_config.green_size = 5;

#else

	video->gl_config.green_size = 6;

#endif

	video->gl_config.blue_size = 5;

	video->gl_config.alpha_size = 0;

	video->gl_config.buffer_size = 0;

	video->gl_config.depth_size = 16;

	video->gl_config.stencil_size = 0;

	video->gl_config.double_buffer = 1;

	video->gl_config.accum_red_size = 0;

	video->gl_config.accum_green_size = 0;

	video->gl_config.accum_blue_size = 0;

	video->gl_config.accum_alpha_size = 0;

	video->gl_config.stereo = 0;

	video->gl_config.multisamplebuffers = 0;

	video->gl_config.multisamplesamples = 0;

	/* Initialize the video subsystem */

	SDL_memset(&vformat, 0, sizeof(vformat));

	if ( video->VideoInit(video, &vformat) < 0 ) {

		SDL_VideoQuit();

		return(-1);

	}

	/* Create a zero sized video surface of the appropriate format */

	video_flags = SDL_SWSURFACE;

	SDL_VideoSurface = SDL_CreateRGBSurface(video_flags, 0, 0,

				vformat.BitsPerPixel,

				vformat.Rmask, vformat.Gmask, vformat.Bmask, 0);

	if ( SDL_VideoSurface == NULL ) {

		SDL_VideoQuit();

		return(-1);

	}

	SDL_PublicSurface = NULL;	/* Until SDL_SetVideoMode() */

#if 0 /* Don't change the current palette - may be used by other programs.

       * The application can't do anything with the display surface until

       * a video mode has been set anyway. :)

       */

	/* If we have a palettized surface, create a default palette */

	if ( SDL_VideoSurface->format->palette ) {

		SDL_PixelFormat *vf = SDL_VideoSurface->format;

		SDL_DitherColors(vf->palette->colors, vf->BitsPerPixel);

		video->SetColors(video,

				 0, vf->palette->ncolors, vf->palette->colors);

	}

#endif

	video->info.vfmt = SDL_VideoSurface->format;

	/* Start the event loop */

	if ( SDL_StartEventLoop(flags) < 0 ) {

		SDL_VideoQuit();

		return(-1);

	}

	SDL_CursorInit(flags & SDL_INIT_EVENTTHREAD);

	/* We're ready to go! */

	return(0);

}

char *SDL_VideoDriverName(char *namebuf, int maxlen)

{

	if ( current_video != NULL ) {

		SDL_strncpy(namebuf, current_video->name, maxlen-1);

		namebuf[maxlen-1] = '\0';

		return(namebuf);

	}

	return(NULL);

}

/*

 * Get the current display surface

 */

SDL_Surface *SDL_GetVideoSurface(void)

{

	SDL_Surface *visible;

	visible = NULL;

	if ( current_video ) {

		visible = current_video->visible;

	}

	return(visible);

}

/*

 * Get the current information about the video hardware

 */

const SDL_VideoInfo *SDL_GetVideoInfo(void)

{

	const SDL_VideoInfo *info;

	info = NULL;

	if ( current_video ) {

		info = &current_video->info;

	}

	return(info);

}

/*

 * Return a pointer to an array of available screen dimensions for the

 * given format, sorted largest to smallest.  Returns NULL if there are

 * no dimensions available for a particular format, or (SDL_Rect **)-1

 * if any dimension is okay for the given format.  If 'format' is NULL,

 * the mode list will be for the format given by SDL_GetVideoInfo()->vfmt

 */

SDL_Rect ** SDL_ListModes (SDL_PixelFormat *format, Uint32 flags)

{

	SDL_VideoDevice *video = current_video;

	SDL_VideoDevice *this  = current_video;

	SDL_Rect **modes;

	modes = NULL;

	if ( SDL_VideoSurface ) {

		if ( format == NULL ) {

			format = SDL_VideoSurface->format;

		}

		modes = video->ListModes(this, format, flags);

	}

	return(modes);

}

/*

 * Check to see if a particular video mode is supported.

 * It returns 0 if the requested mode is not supported under any bit depth,

 * or returns the bits-per-pixel of the closest available mode with the

 * given width and height.  If this bits-per-pixel is different from the

 * one used when setting the video mode, SDL_SetVideoMode() will succeed,

 * but will emulate the requested bits-per-pixel with a shadow surface.

 */

static Uint8 SDL_closest_depths[4][8] = {

	/* 8 bit closest depth ordering */

	{ 0, 8, 16, 15, 32, 24, 0, 0 },

	/* 15,16 bit closest depth ordering */

	{ 0, 16, 15, 32, 24, 8, 0, 0 },

	/* 24 bit closest depth ordering */

	{ 0, 24, 32, 16, 15, 8, 0, 0 },

	/* 32 bit closest depth ordering */

	{ 0, 32, 16, 15, 24, 8, 0, 0 }

};

#ifdef macintosh /* MPW optimization bug? */

#define NEGATIVE_ONE 0xFFFFFFFF

#else

#define NEGATIVE_ONE -1

#endif

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

{

	int table, b, i;

	int supported;

	SDL_PixelFormat format;

	SDL_Rect **sizes;

	/* Currently 1 and 4 bpp are not supported */

	if ( bpp < 8 || bpp > 32 ) {

		return(0);

	}

	if ( (width <= 0) || (height <= 0) ) {

		return(0);

	}

	/* Search through the list valid of modes */

	SDL_memset(&format, 0, sizeof(format));

	supported = 0;

	table = ((bpp+7)/8)-1;

	SDL_closest_depths[table][0] = bpp;

	SDL_closest_depths[table][7] = 0;

	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {

		format.BitsPerPixel = SDL_closest_depths[table][b];

		sizes = SDL_ListModes(&format, flags);

		if ( sizes == (SDL_Rect **)0 ) {

			/* No sizes supported at this bit-depth */

			continue;

		} else 

		if (sizes == (SDL_Rect **)NEGATIVE_ONE) {

			/* Any size supported at this bit-depth */

			supported = 1;

			continue;

		} else if (current_video->handles_any_size) {

			/* Driver can center a smaller surface to simulate fullscreen */

			for ( i=0; sizes[i]; ++i ) {

				if ((sizes[i]->w >= width) && (sizes[i]->h >= height)) {

					supported = 1; /* this mode can fit the centered window. */

					break;

				}

			}

		} else

		for ( i=0; sizes[i]; ++i ) {

			if ((sizes[i]->w == width) && (sizes[i]->h == height)) {

				supported = 1;

				break;

			}

		}

	}

	if ( supported ) {

		--b;

		return(SDL_closest_depths[table][b]);

	} else {

		return(0);

	}

}

/*

 * Get the closest non-emulated video mode to the one requested

 */

static int SDL_GetVideoMode (int *w, int *h, int *BitsPerPixel, Uint32 flags)

{

	int table, b, i;

	int supported;

	int native_bpp;

	SDL_PixelFormat format;

	SDL_Rect **sizes;

	/* Check parameters */

	if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {

		SDL_SetError("Invalid bits per pixel (range is {8...32})");

		return(0);

	}

	if ((*w <= 0) || (*h <= 0)) {

		SDL_SetError("Invalid width or height");

		return(0);

	}

	/* Try the original video mode, get the closest depth */

	native_bpp = SDL_VideoModeOK(*w, *h, *BitsPerPixel, flags);

	if ( native_bpp == *BitsPerPixel ) {

		return(1);

	}

	if ( native_bpp > 0 ) {

		*BitsPerPixel = native_bpp;

		return(1);

	}

	/* No exact size match at any depth, look for closest match */

	SDL_memset(&format, 0, sizeof(format));

	supported = 0;

	table = ((*BitsPerPixel+7)/8)-1;

	SDL_closest_depths[table][0] = *BitsPerPixel;

	SDL_closest_depths[table][7] = SDL_VideoSurface->format->BitsPerPixel;

	for ( b = 0; !supported && SDL_closest_depths[table][b]; ++b ) {

		int best;

		format.BitsPerPixel = SDL_closest_depths[table][b];

		sizes = SDL_ListModes(&format, flags);

		if ( sizes == (SDL_Rect **)0 ) {

			/* No sizes supported at this bit-depth */

			continue;

		}

		best=0;

		for ( i=0; sizes[i]; ++i ) {

			/* Mode with both dimensions bigger or equal than asked ? */

			if ((sizes[i]->w >= *w) && (sizes[i]->h >= *h)) {

				/* Mode with any dimension smaller or equal than current best ? */

				if ((sizes[i]->w <= sizes[best]->w) || (sizes[i]->h <= sizes[best]->h)) {

					/* Now choose the mode that has less pixels */

					if ((sizes[i]->w * sizes[i]->h) <= (sizes[best]->w * sizes[best]->h)) {

						best=i;

						supported = 1;

					}

				}

			}

		}

		if (supported) {

			*w=sizes[best]->w;

			*h=sizes[best]->h;

			*BitsPerPixel = SDL_closest_depths[table][b];

		}

	}

	if ( ! supported ) {

		SDL_SetError("No video mode large enough for %dx%d", *w, *h);

	}

	return(supported);

}

/* This should probably go somewhere else -- like SDL_surface.c */

static void SDL_ClearSurface(SDL_Surface *surface)

{

	Uint32 black;

	black = SDL_MapRGB(surface->format, 0, 0, 0);

	SDL_FillRect(surface, NULL, black);

	if ((surface->flags&SDL_HWSURFACE) && (surface->flags&SDL_DOUBLEBUF)) {

		SDL_Flip(surface);

		SDL_FillRect(surface, NULL, black);

	}

	SDL_Flip(surface);

}

/*