/*

SDL - Simple DirectMedia Layer

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

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/* The high-level video driver subsystem */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#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_DIRECTFB

&DirectFB_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,

#ifdef ENABLE_PHOTON

&ph_bootstrap,

#endif

#ifdef ENABLE_EPOC

&EPOC_bootstrap,

#endif

#ifdef ENABLE_DUMMYVIDEO

&DUMMY_bootstrap,

#endif

#ifdef ENABLE_XBIOS

&XBIOS_bootstrap,

#endif

#ifdef ENABLE_GEM

&GEM_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);

#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 ) {

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

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

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

}

#endif

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 = &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 }

};

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);

/* Sam - If we asked for OpenGL mode, and didn't get it, fail */

if ( is_opengl && !(mode->flags & SDL_OPENGL) ) {

}

}

/*

* 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

fprintf(stderr,

"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") ||

(atof((const char *)video->glGetString(GL_VERSION)) >= 1.2f))

) {

video->is_32bit = 0;

SDL_VideoSurface = SDL_CreateRGBSurface(

flags,

width,

height,

16,

31 << 11,

63 << 5,

31,

0

);

}

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 */

if ((SDL_PublicSurface->flags&SDL_HWSURFACE == SDL_HWSURFACE) && current_video->info.blit_hw)

flags = SDL_HWSURFACE;

else

flags = SDL_SWSURFACE;

#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<numrects; ++i ) {

SDL_LowerBlit(SDL_ShadowSurface, &rects[i],

SDL_VideoSurface, &rects[i]);

}

SDL_EraseCursor(SDL_ShadowSurface);

SDL_UnlockCursor();

} else {

for ( i=0; i<numrects; ++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<numrects; ++i ) {

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

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

}

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

for ( i=0; i<numrects; ++i ) {

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

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

}

} else {

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

}

}