This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_video.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* 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"
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#include "../events/SDL_sysevents.h"
#include "../events/SDL_events_c.h"
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/* Available video drivers */
static VideoBootStrap *bootstrap[] = {
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#if SDL_VIDEO_DRIVER_QUARTZ
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&QZ_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_X11
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&X11_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_DGA
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&DGA_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_NANOX
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&NX_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_IPOD
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&iPod_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_QTOPIA
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&Qtopia_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_WSCONS
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&WSCONS_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_FBCON
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&FBCON_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_DIRECTFB
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&DirectFB_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_PS2GS
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&PS2GS_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_GGI
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&GGI_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_VGL
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&VGL_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_SVGALIB
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&SVGALIB_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_GAPI
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&GAPI_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_WINDIB
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&WINDIB_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_DDRAW
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&DIRECTX_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_BWINDOW
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&BWINDOW_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_TOOLBOX
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&TOOLBOX_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_DRAWSPROCKET
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&DSp_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_CYBERGRAPHICS
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&CGX_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_PHOTON
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&ph_bootstrap,
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#if SDL_VIDEO_DRIVER_EPOC
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&EPOC_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_XBIOS
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&XBIOS_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_GEM
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&GEM_bootstrap,
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#endif
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#if SDL_VIDEO_DRIVER_PICOGUI
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&PG_bootstrap,
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#if SDL_VIDEO_DRIVER_DC
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&DC_bootstrap,
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#if SDL_VIDEO_DRIVER_RISCOS
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&RISCOS_bootstrap,
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#if SDL_VIDEO_DRIVER_OS2FS
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&OS2FSLib_bootstrap,
#endif
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#if SDL_VIDEO_DRIVER_AALIB
&AALIB_bootstrap,
#endif
#if SDL_VIDEO_DRIVER_DUMMY
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&DUMMY_bootstrap,
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#endif
NULL
};
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SDL_VideoDevice *current_video = NULL;
/* Various local functions */
int SDL_VideoInit(const char *driver_name, Uint32 flags);
void SDL_VideoQuit(void);
static SDL_GrabMode SDL_WM_GrabInputOff(void);
/*
* 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 */
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if ( SDL_strrchr(driver_name, ':') != NULL ) {
index = atoi(SDL_strrchr(driver_name, ':')+1);
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}
#endif
for ( i=0; bootstrap[i]; ++i ) {
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if ( SDL_strncmp(bootstrap[i]->name, driver_name,
SDL_strlen(bootstrap[i]->name)) == 0 ) {
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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;
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SDL_memset(&video->info, 0, (sizeof video->info));
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video->displayformatalphapixel = NULL;
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/* Set some very sane GL defaults */
video->gl_config.driver_loaded = 0;
video->gl_config.dll_handle = NULL;
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video->gl_config.red_size = 3;
video->gl_config.green_size = 3;
video->gl_config.blue_size = 2;
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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;
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video->gl_config.stereo = 0;
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video->gl_config.multisamplebuffers = 0;
video->gl_config.multisamplesamples = 0;
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/* Initialize the video subsystem */
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SDL_memset(&vformat, 0, sizeof(vformat));
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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 ) {
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SDL_PixelFormat *vf = SDL_VideoSurface->format;
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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 ) {
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SDL_strlcpy(namebuf, current_video->name, maxlen);
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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 }
};
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#ifdef __MACOS__ /* MPW optimization bug? */
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#define NEGATIVE_ONE 0xFFFFFFFF
#else
#define NEGATIVE_ONE -1
#endif
int SDL_VideoModeOK (int width, int height, int bpp, Uint32 flags)
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{
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);
}
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if ( (width <= 0) || (height <= 0) ) {
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return(0);
}
/* Search through the list valid of modes */
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SDL_memset(&format, 0, sizeof(format));
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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
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if (sizes == (SDL_Rect **)NEGATIVE_ONE) {
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/* Any size supported at this bit-depth */
supported = 1;
continue;
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} 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;
}
}
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} 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;
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/* Check parameters */
if ( *BitsPerPixel < 8 || *BitsPerPixel > 32 ) {
SDL_SetError("Invalid bits per pixel (range is {8...32})");
return(0);
}
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if ((*w <= 0) || (*h <= 0)) {
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SDL_SetError("Invalid width or height");
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return(0);
}
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/* 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 */
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SDL_memset(&format, 0, sizeof(format));
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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 ) {
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int best;
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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;
}
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for ( i=0; sizes[i]; ++i ) {
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/* 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)) {
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/* Now choose the mode that has less pixels */
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if ((sizes[i]->w * sizes[i]->h) <= (sizes[best]->w * sizes[best]->h)) {
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best=i;
supported = 1;
}
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}
}
}
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if (supported) {
*w=sizes[best]->w;
*h=sizes[best]->h;
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*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);
}
/*
* 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 ) {
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SDL_memcpy(SDL_ShadowSurface->format->palette->colors,
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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;
}
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#ifdef __QNXNTO__
#include <sys/neutrino.h>
#endif /* __QNXNTO__ */
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/*
* 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;
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/* Handle obsolete flags */
if ( (flags & SDL_OPENGLBLIT_OBSOLETE) == SDL_OPENGLBLIT_OBSOLETE ) {
SDL_SetError("SDL_OPENGLBLIT is no longer supported");
return(NULL);
}
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/* 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;
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/* Default to the current width and height */
if ( width == 0 ) {
width = video->info.current_w;
}
if ( height == 0 ) {
height = video->info.current_h;
}
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/* 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);
}
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/* Reset the keyboard here so event callbacks can run */
SDL_ResetKeyboard();
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SDL_ResetMouse();
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SDL_cursorstate &= ~CURSOR_USINGSW;
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/* 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 ) {
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SDL_free(video->physpal->colors);
SDL_free(video->physpal);
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video->physpal = NULL;
}
if( video->gammacols) {
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SDL_free(video->gammacols);
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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 */
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/* But not on OS/2 */
#ifndef __OS2__
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SDL_PrivateResize(mode->w, mode->h);
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#endif
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/* Sam - If we asked for OpenGL mode, and didn't get it, fail */
if ( is_opengl && !(mode->flags & SDL_OPENGL) ) {
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SDL_SetError("OpenGL not available");
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/*
* 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 ) {
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SDL_PixelFormat *vf = mode->format;
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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 */
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#if SDL_VIDEO_OPENGL
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/* Load GL symbols (before MakeCurrent, where we need glGetString). */
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if ( flags & SDL_OPENGL ) {
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#if defined(__QNXNTO__) && (_NTO_VERSION < 630)
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#define __SDL_NOGETPROCADDR__
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#elif defined(__MINT__)
#define __SDL_NOGETPROCADDR__
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#ifdef __SDL_NOGETPROCADDR__
#define SDL_PROC(ret,func,params) video->func=func;
#else
#define SDL_PROC(ret,func,params) \
do { \
video->func = SDL_GL_GetProcAddress(#func); \
if ( ! video->func ) { \
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SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \
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return(NULL); \
} \
} while ( 0 );
#endif /* __SDL_NOGETPROCADDR__ */
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#include "SDL_glfuncs.h"
#undef SDL_PROC
}
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#endif /* SDL_VIDEO_OPENGL */
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/* 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);
}
}
/* 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) &&
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(SDL_VideoSurface->flags&SDL_HWSURFACE)) ||
( (flags&SDL_DOUBLEBUF) &&
(SDL_VideoSurface->flags&SDL_HWSURFACE) &&
!(SDL_VideoSurface->flags&SDL_DOUBLEBUF))
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) ) {
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;
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video->info.current_w = SDL_VideoSurface->w;
video->info.current_h = SDL_VideoSurface->h;
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/* 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 */
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if (((SDL_PublicSurface->flags&SDL_HWSURFACE) == SDL_HWSURFACE) && current_video->info.blit_hw)
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flags = SDL_HWSURFACE;
else
flags = SDL_SWSURFACE;
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#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 */
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rect.x = (Sint16)x;
rect.y = (Sint16)y;
rect.w = (Uint16)w;
rect.h = (Uint16)h;
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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;
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if ( screen->flags & SDL_OPENGL ) {
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SDL_SetError("OpenGL active, use SDL_GL_SwapBuffers()");
return;
}
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if ( screen == SDL_ShadowSurface ) {
/* Blit the shadow surface using saved mapping */
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SDL_Palette *pal = screen->format->palette;
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SDL_Color *saved_colors = NULL;
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if ( pal && !(SDL_VideoSurface->flags & SDL_HWPALETTE) ) {
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/* 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]);
}
}
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if ( saved_colors ) {
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pal->colors = saved_colors;
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/* 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);
}
}
}
/*
* Performs hardware double buffering, if possible, or a full update if not.
*/