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/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997, 1998, 1999, 2000, 2001  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@devolution.com

*/

/* The high-level video driver subsystem */

#include 

#include 

#include 

#include "SDL.h"

#include "SDL_error.h"

#include "SDL_video.h"

#include "SDL_events.h"

#include "SDL_mutex.h"

#include "SDL_sysvideo.h"

#include "SDL_sysevents.h"

#include "SDL_blit.h"

#include "SDL_pixels_c.h"

#include "SDL_events_c.h"

#include "SDL_cursor_c.h"

/* Available video drivers */

static VideoBootStrap *bootstrap[] = {

#ifdef ENABLE_X11

	&X11_bootstrap,

#endif

#ifdef ENABLE_DGA

	&DGA_bootstrap,

#endif

#ifdef ENABLE_NANOX

	&NX_bootstrap,

#endif

#ifdef ENABLE_FBCON

	&FBCON_bootstrap,

#endif

#ifdef ENABLE_PS2GS

	&PS2GS_bootstrap,

#endif

#ifdef ENABLE_GGI

	&GGI_bootstrap,

#endif

#ifdef ENABLE_VGL

	&VGL_bootstrap,

#endif

#ifdef ENABLE_SVGALIB

	&SVGALIB_bootstrap,

#endif

#ifdef ENABLE_AALIB

    &AALIB_bootstrap,

#endif

#ifdef ENABLE_DIRECTX

	&DIRECTX_bootstrap,

#endif

#ifdef ENABLE_WINDIB

	&WINDIB_bootstrap,

#endif

#ifdef ENABLE_BWINDOW

	&BWINDOW_bootstrap,

#endif

#ifdef ENABLE_TOOLBOX

	&TOOLBOX_bootstrap,

#endif

#ifdef ENABLE_DRAWSPROCKET

	&DSp_bootstrap,

#endif

#ifdef ENABLE_QUARTZ

	&QZ_bootstrap,

#endif

#ifdef ENABLE_CYBERGRAPHICS

	&CGX_bootstrap,

#endif

#ifdef ENABLE_DUMMYVIDEO

	&DUMMY_bootstrap,

#endif

#ifdef ENABLE_PHOTON

	&ph_bootstrap,

#endif

#ifdef ENABLE_KOLIBRIOS

	&mosvideo_bootstrab,

#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);

#ifdef HAVE_OPENGL

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 ) {

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

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

			             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;

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

	/* 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;

	/* Initialize the video subsystem */

	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 ) {

		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 = ¤t_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 }

};

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 */

	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

#ifdef macintosh /* MPW optimization bug? */

		if ( (sizes == (SDL_Rect **)0xFFFFFFFF) ||

#else

		if ( (sizes == (SDL_Rect **)-1) ||

#endif

		     current_video->handles_any_size ) {

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

			supported = 1;

			continue;

		} 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;

	/* 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 */

	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 ) {

		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;

		}

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

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

				if ( i > 0 ) {

					--i;

					*w = sizes[i]->w;

					*h = sizes[i]->h;

					*BitsPerPixel = SDL_closest_depths[table][b];

					supported = 1;

				} else {

					/* Largest mode too small... */;

				}

				break;

			}

		}

		if ( (i > 0) && ! sizes[i] ) {

			/* The smallest mode was larger than requested, OK */

			--i;

			*w = sizes[i]->w;

			*h = sizes[i]->h;

			*BitsPerPixel = SDL_closest_depths[table][b];

			supported = 1;

		}

	}

	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);

}

/*

 * Create a shadow surface suitable for fooling the app. :-)

 */

static void SDL_CreateShadowSurface(int depth)

{

	Uint32 Rmask, Gmask, Bmask;

	/* Allocate the shadow surface */

	if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {

		Rmask = (SDL_VideoSurface->format)->Rmask;

		Gmask = (SDL_VideoSurface->format)->Gmask;

		Bmask = (SDL_VideoSurface->format)->Bmask;

	} else {

		Rmask = Gmask = Bmask = 0;

	}

	SDL_ShadowSurface = SDL_CreateRGBSurface(SDL_SWSURFACE,

				SDL_VideoSurface->w, SDL_VideoSurface->h,

						depth, Rmask, Gmask, Bmask, 0);

	if ( SDL_ShadowSurface == NULL ) {

		return;

	}

	/* 8-bit shadow surfaces report that they have exclusive palette */

	if ( SDL_ShadowSurface->format->palette ) {

		SDL_ShadowSurface->flags |= SDL_HWPALETTE;

		if ( depth == (SDL_VideoSurface->format)->BitsPerPixel ) {

			memcpy(SDL_ShadowSurface->format->palette->colors,

				SDL_VideoSurface->format->palette->colors,

				SDL_VideoSurface->format->palette->ncolors*

							sizeof(SDL_Color));

		} else {

			SDL_DitherColors(

			SDL_ShadowSurface->format->palette->colors, depth);

		}

	}

	/* If the video surface is resizable, the shadow should say so */

	if ( (SDL_VideoSurface->flags & SDL_RESIZABLE) == SDL_RESIZABLE ) {

		SDL_ShadowSurface->flags |= SDL_RESIZABLE;

	}

	/* If the video surface has no frame, the shadow should say so */

	if ( (SDL_VideoSurface->flags & SDL_NOFRAME) == SDL_NOFRAME ) {

		SDL_ShadowSurface->flags |= SDL_NOFRAME;

	}

	/* If the video surface is fullscreen, the shadow should say so */

	if ( (SDL_VideoSurface->flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {

		SDL_ShadowSurface->flags |= SDL_FULLSCREEN;

	}

	/* If the video surface is flippable, the shadow should say so */

	if ( (SDL_VideoSurface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {

		SDL_ShadowSurface->flags |= SDL_DOUBLEBUF;

	}

	return;

}

/*

 * Set the requested video mode, allocating a shadow buffer if necessary.

 */

SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags)

{

	SDL_VideoDevice *video, *this;

	SDL_Surface *prev_mode, *mode;

	int video_w;

	int video_h;

	int video_bpp;

	int is_opengl;

	SDL_GrabMode saved_grab;

	/* Start up the video driver, if necessary..

	   WARNING: This is the only function protected this way!

	 */

	if ( ! current_video ) {

		if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) {

			return(NULL);

		}

	}

	this = video = current_video;

	/* Default to the current video bpp */

	if ( bpp == 0 ) {

		flags |= SDL_ANYFORMAT;

		bpp = SDL_VideoSurface->format->BitsPerPixel;

	}

	/* Get a good video mode, the closest one possible */

	video_w = width;

	video_h = height;

	video_bpp = bpp;

	if ( ! SDL_GetVideoMode(&video_w, &video_h, &video_bpp, flags) ) {

		return(NULL);

	}

	/* Check the requested flags */

	/* There's no palette in > 8 bits-per-pixel mode */

	if ( video_bpp > 8 ) {

		flags &= ~SDL_HWPALETTE;

	}

#if 0

	if ( (flags&SDL_FULLSCREEN) != SDL_FULLSCREEN ) {

		/* There's no windowed double-buffering */

		flags &= ~SDL_DOUBLEBUF;

	}

#endif

	if ( (flags&SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {

		/* Use hardware surfaces when double-buffering */

		flags |= SDL_HWSURFACE;

	}

	is_opengl = ( ( flags & SDL_OPENGL ) == SDL_OPENGL );

	if ( is_opengl ) {

		/* These flags are for 2D video modes only */

		flags &= ~(SDL_HWSURFACE|SDL_DOUBLEBUF);

	}

	/* Reset the keyboard here so event callbacks can run */

	SDL_ResetKeyboard();

	/* Clean up any previous video mode */

	if ( SDL_PublicSurface != NULL ) {

		SDL_PublicSurface = NULL;

	}

	if ( SDL_ShadowSurface != NULL ) {

		SDL_Surface *ready_to_go;

		ready_to_go = SDL_ShadowSurface;

		SDL_ShadowSurface = NULL;

		SDL_FreeSurface(ready_to_go);

	}

	if ( video->physpal ) {

		free(video->physpal->colors);

		free(video->physpal);

		video->physpal = NULL;

	}

	if( video->gammacols) {

	        free(video->gammacols);

		video->gammacols = NULL;

	}

	/* Save the previous grab state and turn off grab for mode switch */

	saved_grab = SDL_WM_GrabInputOff();

	/* Try to set the video mode, along with offset and clipping */

	prev_mode = SDL_VideoSurface;

	SDL_LockCursor();

	SDL_VideoSurface = NULL;	/* In case it's freed by driver */

	mode = video->SetVideoMode(this, prev_mode,video_w,video_h,video_bpp,flags);

	if ( mode ) { /* Prevent resize events from mode change */

	    SDL_PrivateResize(mode->w, mode->h);

        }

	/*

	 * rcg11292000

	 * If you try to set an SDL_OPENGL surface, and fail to find a

	 * matching  visual, then the next call to SDL_SetVideoMode()

	 * will segfault, since  we no longer point to a dummy surface,

	 * but rather NULL.

	 * Sam 11/29/00

	 * WARNING, we need to make sure that the previous mode hasn't

	 * already been freed by the video driver.  What do we do in

	 * that case?  Should we call SDL_VideoInit() again?

	 */

	SDL_VideoSurface = (mode != NULL) ? mode : prev_mode;

	if ( (mode != NULL) && (!is_opengl) ) {

		/* Sanity check */

		if ( (mode->w < width) || (mode->h < height) ) {

			SDL_SetError("Video mode smaller than requested");

			return(NULL);

		}

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

		if ( mode->format->palette ) {

	        	SDL_PixelFormat *vf = mode->format;

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

			video->SetColors(this, 0, vf->palette->ncolors,

			                           vf->palette->colors);

		}

		/* Clear the surface to black */

		video->offset_x = 0;

		video->offset_y = 0;

		mode->offset = 0;

		SDL_SetClipRect(mode, NULL);

		SDL_ClearSurface(mode);

		/* Now adjust the offsets to match the desired mode */

		video->offset_x = (mode->w-width)/2;

		video->offset_y = (mode->h-height)/2;

		mode->offset = video->offset_y*mode->pitch +

				video->offset_x*mode->format->BytesPerPixel;

#ifdef DEBUG_VIDEO

 SDL_printf("Requested mode: %dx%dx%d, obtained mode %dx%dx%d (offset %d)\n",

		width, height, bpp,

		mode->w, mode->h, mode->format->BitsPerPixel, mode->offset);

#endif

		mode->w = width;

		mode->h = height;

		SDL_SetClipRect(mode, NULL);

	}

	SDL_ResetCursor();

	SDL_UnlockCursor();

	/* If we failed setting a video mode, return NULL... (Uh Oh!) */

	if ( mode == NULL ) {

		return(NULL);

	}

	/* If there is no window manager, set the SDL_NOFRAME flag */

	if ( ! video->info.wm_available ) {

		mode->flags |= SDL_NOFRAME;

	}

	/* Reset the mouse cursor and grab for new video mode */

	SDL_SetCursor(NULL);

	if ( video->UpdateMouse ) {

		video->UpdateMouse(this);

	}

	SDL_WM_GrabInput(saved_grab);

	SDL_GetRelativeMouseState(NULL, NULL); /* Clear first large delta */

	/* If we're running OpenGL, make the context current */

	if ( (video->screen->flags & SDL_OPENGL) &&

	      video->GL_MakeCurrent ) {

		if ( video->GL_MakeCurrent(this) < 0 ) {

			return(NULL);

		}

	}

	/* Set up a fake SDL surface for OpenGL "blitting" */

	if ( (flags & SDL_OPENGLBLIT) == SDL_OPENGLBLIT ) {

		/* Load GL functions for performing the texture updates */

#ifdef HAVE_OPENGL

#define SDL_PROC(ret,func,params) \

do { \

	video->func = SDL_GL_GetProcAddress(#func); \

	if ( ! video->func ) { \

		SDL_SetError("Couldn't load GL function: %s\n", #func); \

		return(NULL); \

	} \

} while ( 0 );

#include "SDL_glfuncs.h"

#undef SDL_PROC

		/* Create a software surface for blitting */

#ifdef GL_VERSION_1_2

		/* If the implementation either supports the packed pixels

		   extension, or implements the core OpenGL 1.2 API, it will

		   support the GL_UNSIGNED_SHORT_5_6_5 texture format.

		 */

		if ( (bpp == 16) &&

		     (strstr((const char *)video->glGetString(GL_EXTENSIONS),

		                           "GL_EXT_packed_pixels") ||

		     (strncmp((const char *)video->glGetString(GL_VERSION),

		              "1.2", 3) == 0)) )

		{

			video->is_32bit = 0;

			SDL_VideoSurface = SDL_CreateRGBSurface(

				flags,

				width,

				height,

				16,

				31 << 11,

				63 << 5,

				31,

				);

		}

		else

#endif /* OpenGL 1.2 */

		{

			video->is_32bit = 1;

			SDL_VideoSurface = SDL_CreateRGBSurface(

				flags,

				width,

				height,

				32,

#if SDL_BYTEORDER == SDL_LIL_ENDIAN

				0x000000FF,

				0x0000FF00,

				0x00FF0000,

				0xFF000000

#else

				0xFF000000,

				0x00FF0000,

				0x0000FF00,

				0x000000FF

#endif

				);

		}

		if ( ! SDL_VideoSurface ) {

			return(NULL);

		}

		SDL_VideoSurface->flags = mode->flags | SDL_OPENGLBLIT;

		/* Free the original video mode surface (is this safe?) */

		SDL_FreeSurface(mode);

                /* Set the surface completely opaque & white by default */

		memset( SDL_VideoSurface->pixels, 255, SDL_VideoSurface->h * SDL_VideoSurface->pitch );

		video->glGenTextures( 1, &video->texture );

		video->glBindTexture( GL_TEXTURE_2D, video->texture );

		video->glTexImage2D(

			GL_TEXTURE_2D,

			0,

			video->is_32bit ? GL_RGBA : GL_RGB,

			256,

			256,

			0,

			video->is_32bit ? GL_RGBA : GL_RGB,

#ifdef GL_VERSION_1_2

			video->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,

#else

			GL_UNSIGNED_BYTE,

#endif

			NULL);

		video->UpdateRects = SDL_GL_UpdateRectsLock;

#else

		SDL_SetError("Somebody forgot to #define HAVE_OPENGL");

		return(NULL);

#endif

	}

	/* Create a shadow surface if necessary */

	/* There are three conditions under which we create a shadow surface:

		1.  We need a particular bits-per-pixel that we didn't get.

		2.  We need a hardware palette and didn't get one.

		3.  We need a software surface and got a hardware surface.

	*/

	if ( !(SDL_VideoSurface->flags & SDL_OPENGL) &&

	     (

	     (  !(flags&SDL_ANYFORMAT) &&

			(SDL_VideoSurface->format->BitsPerPixel != bpp)) ||

	     (   (flags&SDL_HWPALETTE) &&

				!(SDL_VideoSurface->flags&SDL_HWPALETTE)) ||

		/* If the surface is in hardware, video writes are visible

		   as soon as they are performed, so we need to buffer them

		 */

	     (   ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) &&

				(SDL_VideoSurface->flags&SDL_HWSURFACE))

	     ) ) {

		SDL_CreateShadowSurface(bpp);

		if ( SDL_ShadowSurface == NULL ) {

			SDL_SetError("Couldn't create shadow surface");

			return(NULL);

		}

		SDL_PublicSurface = SDL_ShadowSurface;

	} else {

		SDL_PublicSurface = SDL_VideoSurface;

	}

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

	/* We're done! */

	return(SDL_PublicSurface);

}

/*

 * Convert a surface into the video pixel format.

 */

SDL_Surface * SDL_DisplayFormat (SDL_Surface *surface)

{

	Uint32 flags;

	if ( ! SDL_PublicSurface ) {

		SDL_SetError("No video mode has been set");

		return(NULL);

	}

	/* Set the flags appropriate for copying to display surface */

	flags  = (SDL_PublicSurface->flags&SDL_HWSURFACE);

#ifdef AUTORLE_DISPLAYFORMAT

	flags |= (surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA));

	flags |= SDL_RLEACCELOK;

#else

	flags |= surface->flags & (SDL_SRCCOLORKEY|SDL_SRCALPHA|SDL_RLEACCELOK);

#endif

	return(SDL_ConvertSurface(surface, SDL_PublicSurface->format, flags));

}

/*

 * Convert a surface into a format that's suitable for blitting to

 * the screen, but including an alpha channel.

 */

SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface)

{

	SDL_PixelFormat *vf;

	SDL_PixelFormat *format;

	SDL_Surface *converted;

	Uint32 flags;

	/* default to ARGB8888 */

	Uint32 amask = 0xff000000;

	Uint32 rmask = 0x00ff0000;

	Uint32 gmask = 0x0000ff00;

	Uint32 bmask = 0x000000ff;

	if ( ! SDL_PublicSurface ) {

		SDL_SetError("No video mode has been set");

		return(NULL);

	}

	vf = SDL_PublicSurface->format;

	switch(vf->BytesPerPixel) {

	    case 2:

		/* For XGY5[56]5, use, AXGY8888, where {X, Y} = {R, B}.

		   For anything else (like ARGB4444) it doesn't matter

		   since we have no special code for it anyway */

		if ( (vf->Rmask == 0x1f) &&

		     (vf->Bmask == 0xf800 || vf->Bmask == 0x7c00)) {

			rmask = 0xff;

			bmask = 0xff0000;

		}

		break;

	    case 3:

	    case 4:

		/* Keep the video format, as long as the high 8 bits are

		   unused or alpha */

		if ( (vf->Rmask == 0xff) && (vf->Bmask == 0xff0000) ) {

			rmask = 0xff;

			bmask = 0xff0000;

		}

		break;

	    default:

		/* We have no other optimised formats right now. When/if a new

		   optimised alpha format is written, add the converter here */

		break;

	}

	format = SDL_AllocFormat(32, rmask, gmask, bmask, amask);

	flags = SDL_PublicSurface->flags & SDL_HWSURFACE;

	flags |= surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);

	converted = SDL_ConvertSurface(surface, format, flags);

	SDL_FreeFormat(format);

	return(converted);

}

/*

 * Update a specific portion of the physical screen

 */

void SDL_UpdateRect(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)

{

	if ( screen ) {

		SDL_Rect rect;

		/* Perform some checking */

		if ( w == 0 )

			w = screen->w;

		if ( h == 0 )

			h = screen->h;

		if ( (int)(x+w) > screen->w )

			return;

		if ( (int)(y+h) > screen->h )

			return;

		/* Fill the rectangle */

		rect.x = x;

		rect.y = y;

		rect.w = w;

		rect.h = h;

		SDL_UpdateRects(screen, 1, &rect);

	}

}

void SDL_UpdateRects (SDL_Surface *screen, int numrects, SDL_Rect *rects)

{

	int i;

	SDL_VideoDevice *video = current_video;

	SDL_VideoDevice *this = current_video;

	if ( screen == SDL_ShadowSurface ) {

		/* Blit the shadow surface using saved mapping */

	        SDL_Palette *pal = screen->format->palette;

		SDL_Color *saved_colors = NULL;

	        if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {

			/* simulated 8bpp, use correct physical palette */

			saved_colors = pal->colors;

			if ( video->gammacols ) {

				/* gamma-corrected palette */

				pal->colors = video->gammacols;

			} else if ( video->physpal ) {

				/* physical palette different from logical */

				pal->colors = video->physpal->colors;

			}

		}

		if ( SHOULD_DRAWCURSOR(SDL_cursorstate) ) {

			SDL_LockCursor();

			SDL_DrawCursor(SDL_ShadowSurface);

			for ( i=0; i

				SDL_LowerBlit(SDL_ShadowSurface, &rects[i],

						SDL_VideoSurface, &rects[i]);

			}

			SDL_EraseCursor(SDL_ShadowSurface);

			SDL_UnlockCursor();

		} else {

			for ( i=0; i

				SDL_LowerBlit(SDL_ShadowSurface, &rects[i],

						SDL_VideoSurface, &rects[i]);

			}

		}

		if ( saved_colors )

			pal->colors = saved_colors;

		/* Fall through to video surface update */

		screen = SDL_VideoSurface;

	}

	if ( screen == SDL_VideoSurface ) {

		/* Update the video surface */

		if ( screen->offset ) {

			for ( i=0; i

				rects[i].x += video->offset_x;

				rects[i].y += video->offset_y;

			}

			video->UpdateRects(this, numrects, rects);

			for ( i=0; i

				rects[i].x -= video->offset_x;

				rects[i].y -= video->offset_y;

			}

		} else {

			video->UpdateRects(this, numrects, rects);

		}

	}

}

/*

 * Performs hardware double buffering, if possible, or a full update if not.

 */

int SDL_Flip(SDL_Surface *screen)

{

	SDL_VideoDevice *video = current_video;

	/* Copy the shadow surface to the video surface */

	if ( screen == SDL_ShadowSurface ) {

		SDL_Rect rect;

	        SDL_Palette *pal = screen->format->palette;

		SDL_Color *saved_colors = NULL;

	        if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {

			/* simulated 8bpp, use correct physical palette */

			saved_colors = pal->colors;

			if ( video->gammacols ) {

				/* gamma-corrected palette */

				pal->colors = video->gammacols;

			} else if ( video->physpal ) {

				/* physical palette different from logical */

				pal->colors = video->physpal->colors;

			}

		}

		rect.x = 0;

		rect.y = 0;

		rect.w = screen->w;

		rect.h = screen->h;

		SDL_LowerBlit(SDL_ShadowSurface,&rect, SDL_VideoSurface,&rect);

		if ( saved_colors )

			pal->colors = saved_colors;

		screen = SDL_VideoSurface;

	}

	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {

		SDL_VideoDevice *this  = current_video;

		return(video->FlipHWSurface(this, SDL_VideoSurface));

	} else {

		SDL_UpdateRect(screen, 0, 0, 0, 0);

	}

	return(0);

}

static void SetPalette_logical(SDL_Surface *screen, SDL_Color *colors,

			       int firstcolor, int ncolors)

{

        SDL_Palette *pal = screen->format->palette;

	SDL_Palette *vidpal;

	if ( colors != (pal->colors + firstcolor) ) {

	        memcpy(pal->colors + firstcolor, colors,

		       ncolors * sizeof(*colors));

	}

	vidpal = SDL_VideoSurface->format->palette;

	if ( (screen == SDL_ShadowSurface) && vidpal ) {

	        /*

		 * This is a shadow surface, and the physical

		 * framebuffer is also indexed. Propagate the

		 * changes to its logical palette so that

		 * updates are always identity blits

		 */

		memcpy(vidpal->colors + firstcolor, colors,

		       ncolors * sizeof(*colors));

	}

	SDL_FormatChanged(screen);

}

static int SetPalette_physical(SDL_Surface *screen,

                               SDL_Color *colors, int firstcolor, int ncolors)

{

	SDL_VideoDevice *video = current_video;

	int gotall = 1;

	if ( video->physpal ) {

		/* We need to copy the new colors, since we haven't

		 * already done the copy in the logical set above.

		 */

		memcpy(video->physpal->colors + firstcolor,

		       colors, ncolors * sizeof(*colors));

	}

	if ( screen == SDL_ShadowSurface ) {

		if ( SDL_VideoSurface->flags & SDL_HWPALETTE ) {

			/*

			 * The real screen is also indexed - set its physical

			 * palette. The physical palette does not include the

			 * gamma modification, we apply it directly instead,

			 * but this only happens if we have hardware palette.

			 */

			screen = SDL_VideoSurface;

		} else {

			/*

			 * The video surface is not indexed - invalidate any

			 * active shadow-to-video blit mappings.

			 */

			if ( screen->map->dst == SDL_VideoSurface ) {

				SDL_InvalidateMap(screen->map);

			}

			if ( video->gamma ) {

				if( ! video->gammacols ) {

					SDL_Palette *pp = video->physpal;

					if(!pp)

						pp = screen->format->palette;

					video->gammacols = malloc(pp->ncolors

							  * sizeof(SDL_Color));

					SDL_ApplyGamma(video->gamma,

						       pp->colors,

						       video->gammacols,

						       pp->ncolors);

				} else {

					SDL_ApplyGamma(video->gamma, colors,

						       video->gammacols

						       + firstcolor,

						       ncolors);

				}

			}

			SDL_UpdateRect(screen, 0, 0, 0, 0);

		}

	}

	if ( screen == SDL_VideoSurface ) {

		SDL_Color gcolors[256];

	        if ( video->gamma ) {

		        SDL_ApplyGamma(video->gamma, colors, gcolors, ncolors);

			colors = gcolors;

		}

		gotall = video->SetColors(video, firstcolor, ncolors, colors);

		if ( ! gotall ) {

			/* The video flags shouldn't have SDL_HWPALETTE, and

			   the video driver is responsible for copying back the

			   correct colors into the video surface palette.

			*/

			;

		}

		SDL_CursorPaletteChanged();

	}

	return gotall;

}

/*

 * Set the physical and/or logical colormap of a surface:

 * Only the screen has a physical colormap. It determines what is actually

 * sent to the display.

 * The logical colormap is used to map blits to/from the surface.

 * 'which' is one or both of SDL_LOGPAL, SDL_PHYSPAL

 *

 * Return nonzero if all colours were set as requested, or 0 otherwise.

 */

int SDL_SetPalette(SDL_Surface *screen, int which,

		   SDL_Color *colors, int firstcolor, int ncolors)