This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_x11modes.c
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Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
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*/
#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_X11
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#include "SDL_x11video.h"
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/*#define X11MODES_DEBUG*/
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static int
get_visualinfo(Display * display, int screen, XVisualInfo * vinfo)
{
const char *visual_id = SDL_getenv("SDL_VIDEO_X11_VISUALID");
int depth;
/* Look for an exact visual, if requested */
if (visual_id) {
XVisualInfo *vi, template;
int nvis;
SDL_zero(template);
template.visualid = SDL_strtol(visual_id, NULL, 0);
vi = XGetVisualInfo(display, VisualIDMask, &template, &nvis);
if (vi) {
*vinfo = *vi;
XFree(vi);
return 0;
}
}
depth = DefaultDepth(display, screen);
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if ((X11_UseDirectColorVisuals() &&
XMatchVisualInfo(display, screen, depth, DirectColor, vinfo)) ||
XMatchVisualInfo(display, screen, depth, TrueColor, vinfo) ||
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XMatchVisualInfo(display, screen, depth, PseudoColor, vinfo) ||
XMatchVisualInfo(display, screen, depth, StaticColor, vinfo)) {
return 0;
}
return -1;
}
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int
X11_GetVisualInfoFromVisual(Display * display, Visual * visual, XVisualInfo * vinfo)
{
XVisualInfo *vi;
int nvis;
vinfo->visualid = XVisualIDFromVisual(visual);
vi = XGetVisualInfo(display, VisualIDMask, vinfo, &nvis);
if (vi) {
*vinfo = *vi;
XFree(vi);
return 0;
}
return -1;
}
Uint32
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X11_GetPixelFormatFromVisualInfo(Display * display, XVisualInfo * vinfo)
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{
if (vinfo->class == DirectColor || vinfo->class == TrueColor) {
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
Rmask = vinfo->visual->red_mask;
Gmask = vinfo->visual->green_mask;
Bmask = vinfo->visual->blue_mask;
if (vinfo->depth == 32) {
Amask = (0xFFFFFFFF & ~(Rmask | Gmask | Bmask));
} else {
Amask = 0;
}
bpp = vinfo->depth;
if (bpp == 24) {
int i, n;
XPixmapFormatValues *p = XListPixmapFormats(display, &n);
if (p) {
for (i = 0; i < n; ++i) {
if (p[i].depth == 24) {
bpp = p[i].bits_per_pixel;
break;
}
}
XFree(p);
}
}
return SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
}
if (vinfo->class == PseudoColor || vinfo->class == StaticColor) {
switch (vinfo->depth) {
case 8:
return SDL_PIXELTYPE_INDEX8;
case 4:
if (BitmapBitOrder(display) == LSBFirst) {
return SDL_PIXELFORMAT_INDEX4LSB;
} else {
return SDL_PIXELFORMAT_INDEX4MSB;
}
break;
case 1:
if (BitmapBitOrder(display) == LSBFirst) {
return SDL_PIXELFORMAT_INDEX1LSB;
} else {
return SDL_PIXELFORMAT_INDEX1MSB;
}
break;
}
}
return SDL_PIXELFORMAT_UNKNOWN;
}
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X11_InitModes(_THIS)
{
SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
int screen;
for (screen = 0; screen < ScreenCount(data->display); ++screen) {
XVisualInfo vinfo;
SDL_VideoDisplay display;
SDL_DisplayData *displaydata;
SDL_DisplayMode mode;
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XPixmapFormatValues *pixmapFormats;
int i, n;
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if (get_visualinfo(data->display, screen, &vinfo) < 0) {
continue;
}
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mode.format = X11_GetPixelFormatFromVisualInfo(data->display, &vinfo);
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if (SDL_ISPIXELFORMAT_INDEXED(mode.format)) {
/* We don't support palettized modes now */
continue;
}
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mode.w = DisplayWidth(data->display, screen);
mode.h = DisplayHeight(data->display, screen);
mode.refresh_rate = 0;
mode.driverdata = NULL;
displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
if (!displaydata) {
continue;
}
displaydata->screen = screen;
displaydata->visual = vinfo.visual;
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displaydata->depth = vinfo.depth;
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displaydata->scanline_pad = SDL_BYTESPERPIXEL(mode.format) * 8;
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pixmapFormats = XListPixmapFormats(data->display, &n);
if (pixmapFormats) {
for (i = 0; i < n; ++i) {
if (pixmapFormats[i].depth == displaydata->depth) {
displaydata->scanline_pad = pixmapFormats[i].scanline_pad;
break;
}
}
XFree(pixmapFormats);
}
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SDL_zero(display);
display.desktop_mode = mode;
display.current_mode = mode;
display.driverdata = displaydata;
SDL_AddVideoDisplay(&display);
}
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if (_this->num_displays == 0) {
SDL_SetError("No available displays");
return -1;
}
return 0;
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/* Global for the error handler */
int vm_event, vm_error = -1;
#if SDL_VIDEO_DRIVER_X11_XINERAMA
static SDL_bool
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CheckXinerama(Display * display, int *major, int *minor)
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{
const char *env;
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
env = getenv("SDL_VIDEO_X11_XINERAMA");
if (env && !SDL_atoi(env)) {
return SDL_FALSE;
}
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if (!SDL_X11_HAVE_XINERAMA) {
return SDL_FALSE;
}
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/* Query the extension version */
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if (!XineramaQueryExtension(display, major, minor) ||
!XineramaIsActive(display)) {
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return SDL_FALSE;
}
return SDL_TRUE;
}
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
#if SDL_VIDEO_DRIVER_X11_XRANDR
static SDL_bool
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CheckXRandR(Display * display, int *major, int *minor)
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{
const char *env;
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
env = getenv("SDL_VIDEO_X11_XRANDR");
if (env && !SDL_atoi(env)) {
return SDL_FALSE;
}
if (!SDL_X11_HAVE_XRANDR) {
return SDL_FALSE;
}
/* Query the extension version */
if (!XRRQueryVersion(display, major, minor)) {
return SDL_FALSE;
}
return SDL_TRUE;
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
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#if SDL_VIDEO_DRIVER_X11_XVIDMODE
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static SDL_bool
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CheckVidMode(Display * display, int *major, int *minor)
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{
const char *env;
/* Default the extension not available */
*major = *minor = 0;
/* Allow environment override */
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env = getenv("SDL_VIDEO_X11_XVIDMODE");
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if (env && !SDL_atoi(env)) {
return SDL_FALSE;
}
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if (!SDL_X11_HAVE_XVIDMODE) {
return SDL_FALSE;
}
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/* Query the extension version */
vm_error = -1;
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if (!XF86VidModeQueryExtension(display, &vm_event, &vm_error)
|| !XF86VidModeQueryVersion(display, major, minor)) {
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return SDL_FALSE;
}
return SDL_TRUE;
}
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Bool XF86VidModeGetModeInfo(Display * dpy, int scr,
XF86VidModeModeInfo* info)
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{
Bool retval;
int dotclock;
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XF86VidModeModeLine l;
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SDL_zerop(info);
SDL_zero(l);
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retval = XF86VidModeGetModeLine(dpy, scr, &dotclock, &l);
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info->dotclock = dotclock;
info->hdisplay = l.hdisplay;
info->hsyncstart = l.hsyncstart;
info->hsyncend = l.hsyncend;
info->htotal = l.htotal;
info->hskew = l.hskew;
info->vdisplay = l.vdisplay;
info->vsyncstart = l.vsyncstart;
info->vsyncend = l.vsyncend;
info->vtotal = l.vtotal;
info->flags = l.flags;
info->privsize = l.privsize;
info->private = l.private;
return retval;
}
static int
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calculate_rate(XF86VidModeModeInfo * info)
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return (info->htotal
&& info->vtotal) ? (1000 * info->dotclock / (info->htotal *
info->vtotal)) : 0;
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}
static void
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save_mode(Display * display, SDL_DisplayData * data)
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XF86VidModeGetModeInfo(display, data->screen,
&data->saved_mode);
XF86VidModeGetViewPort(display, data->screen,
&data->saved_view.x,
&data->saved_view.y);
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static void
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restore_mode(Display * display, SDL_DisplayData * data)
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XF86VidModeModeInfo mode;
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if (XF86VidModeGetModeInfo(display, data->screen, &mode)) {
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if (SDL_memcmp(&mode, &data->saved_mode, sizeof(mode)) != 0) {
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XF86VidModeSwitchToMode(display, data->screen, &data->saved_mode);
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}
}
if ((data->saved_view.x != 0) || (data->saved_view.y != 0)) {
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XF86VidModeSetViewPort(display, data->screen,
data->saved_view.x,
data->saved_view.y);
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#endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
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X11_GetDisplayModes(_THIS, SDL_VideoDisplay * sdl_display)
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Display *display = ((SDL_VideoData *) _this->driverdata)->display;
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SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
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#if SDL_VIDEO_DRIVER_X11_XINERAMA
int xinerama_major, xinerama_minor;
int screens;
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XineramaScreenInfo * xinerama;
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#endif
#if SDL_VIDEO_DRIVER_X11_XRANDR
int xrandr_major, xrandr_minor;
int nsizes, nrates;
XRRScreenSize *sizes;
short *rates;
#endif
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#if SDL_VIDEO_DRIVER_X11_XVIDMODE
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int vm_major, vm_minor;
int nmodes;
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XF86VidModeModeInfo ** modes;
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#endif
int screen_w;
int screen_h;
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SDL_DisplayMode mode;
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/* Unfortunately X11 requires the window to be created with the correct
* visual and depth ahead of time, but the SDL API allows you to create
* a window before setting the fullscreen display mode. This means that
* we have to use the same format for all windows and all display modes.
* (or support recreating the window with a new visual behind the scenes)
*/
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mode.format = sdl_display->current_mode.format;
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mode.driverdata = NULL;
data->use_xinerama = 0;
data->use_xrandr = 0;
data->use_vidmode = 0;
screen_w = DisplayWidth(display, data->screen);
screen_h = DisplayHeight(display, data->screen);
#if SDL_VIDEO_DRIVER_X11_XINERAMA
/* Query Xinerama extention */
if (CheckXinerama(display, &xinerama_major, &xinerama_minor)) {
#ifdef X11MODES_DEBUG
printf("X11 detected Xinerama:\n");
#endif
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xinerama = XineramaQueryScreens(display, &screens);
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if (xinerama) {
int i;
for (i = 0; i < screens; i++) {
#ifdef X11MODES_DEBUG
printf("xinerama %d: %dx%d+%d+%d\n",
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xinerama[i].screen_number,
xinerama[i].width, xinerama[i].height,
xinerama[i].x_org, xinerama[i].y_org);
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#endif
if (xinerama[i].screen_number == data->screen) {
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data->use_xinerama =
xinerama_major * 100 + xinerama_minor;
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data->xinerama_info = xinerama[i];
}
}
XFree(xinerama);
}
if (data->use_xinerama) {
/* Add the full xinerama mode */
if (screen_w > data->xinerama_info.width ||
screen_h > data->xinerama_info.height) {
mode.w = screen_w;
mode.h = screen_h;
mode.refresh_rate = 0;
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SDL_AddDisplayMode(sdl_display, &mode);
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}
/* Add the head xinerama mode */
mode.w = data->xinerama_info.width;
mode.h = data->xinerama_info.height;
mode.refresh_rate = 0;
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SDL_AddDisplayMode(sdl_display, &mode);
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}
}
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
#if SDL_VIDEO_DRIVER_X11_XRANDR
/* XRandR */
/* require at least XRandR v1.0 (arbitrary) */
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if (CheckXRandR(display, &xrandr_major, &xrandr_minor)
&& xrandr_major >= 1) {
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#ifdef X11MODES_DEBUG
fprintf(stderr, "XRANDR: XRRQueryVersion: V%d.%d\n",
xrandr_major, xrandr_minor);
#endif
/* save the screen configuration since we must reference it
each time we toggle modes.
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*/
data->screen_config =
XRRGetScreenInfo(display, RootWindow(display, data->screen));
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/* retrieve the list of resolution */
sizes = XRRConfigSizes(data->screen_config, &nsizes);
if (nsizes > 0) {
int i, j;
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for (i = 0; i < nsizes; i++) {
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mode.w = sizes[i].width;
mode.h = sizes[i].height;
rates = XRRConfigRates(data->screen_config, i, &nrates);
for (j = 0; j < nrates; ++j) {
mode.refresh_rate = rates[j];
#ifdef X11MODES_DEBUG
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fprintf(stderr,
"XRANDR: mode = %4d[%d], w = %4d, h = %4d, rate = %4d\n",
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i, j, mode.w, mode.h, mode.refresh_rate);
#endif
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SDL_AddDisplayMode(sdl_display, &mode);
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}
}
data->use_xrandr = xrandr_major * 100 + xrandr_minor;
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data->saved_size =
XRRConfigCurrentConfiguration(data->screen_config,
&data->saved_rotation);
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data->saved_rate = XRRConfigCurrentRate(data->screen_config);
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
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#if SDL_VIDEO_DRIVER_X11_XVIDMODE
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/* XVidMode */
if (!data->use_xrandr &&
#if SDL_VIDEO_DRIVER_X11_XINERAMA
(!data->use_xinerama || data->xinerama_info.screen_number == 0) &&
#endif
CheckVidMode(display, &vm_major, &vm_minor) &&
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XF86VidModeGetAllModeLines(display, data->screen, &nmodes, &modes)) {
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int i;
#ifdef X11MODES_DEBUG
printf("VidMode modes: (unsorted)\n");
for (i = 0; i < nmodes; ++i) {
printf("Mode %d: %d x %d @ %d\n", i,
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modes[i]->hdisplay, modes[i]->vdisplay,
calculate_rate(modes[i]));
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}
#endif
for (i = 0; i < nmodes; ++i) {
mode.w = modes[i]->hdisplay;
mode.h = modes[i]->vdisplay;
mode.refresh_rate = calculate_rate(modes[i]);
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SDL_AddDisplayMode(sdl_display, &mode);
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}
XFree(modes);
data->use_vidmode = vm_major * 100 + vm_minor;
save_mode(display, data);
}
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#endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
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if (!data->use_xrandr && !data->use_vidmode) {
mode.w = screen_w;
mode.h = screen_h;
mode.refresh_rate = 0;
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SDL_AddDisplayMode(sdl_display, &mode);
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}
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#ifdef X11MODES_DEBUG
if (data->use_xinerama) {
printf("Xinerama is enabled\n");
}
if (data->use_xrandr) {
printf("XRandR is enabled\n");
}
if (data->use_vidmode) {
printf("VidMode is enabled\n");
}
#endif /* X11MODES_DEBUG */
}
static void
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get_real_resolution(Display * display, SDL_DisplayData * data, int *w, int *h,
int *rate)
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{
#if SDL_VIDEO_DRIVER_X11_XRANDR
if (data->use_xrandr) {
int nsizes;
XRRScreenSize *sizes;
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sizes = XRRConfigSizes(data->screen_config, &nsizes);
if (nsizes > 0) {
int cur_size;
Rotation cur_rotation;
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cur_size =
XRRConfigCurrentConfiguration(data->screen_config,
&cur_rotation);
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*w = sizes[cur_size].width;
*h = sizes[cur_size].height;
*rate = XRRConfigCurrentRate(data->screen_config);
#ifdef X11MODES_DEBUG
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fprintf(stderr,
"XRANDR: get_real_resolution: w = %d, h = %d, rate = %d\n",
*w, *h, *rate);
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#endif
return;
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
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#if SDL_VIDEO_DRIVER_X11_XVIDMODE
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if (data->use_vidmode) {
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XF86VidModeModeInfo mode;
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if (XF86VidModeGetModeInfo(display, data->screen, &mode)) {
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*w = mode.hdisplay;
*h = mode.vdisplay;
*rate = calculate_rate(&mode);
return;
}
}
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#endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
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#if SDL_VIDEO_DRIVER_X11_XINERAMA
if (data->use_xinerama) {
*w = data->xinerama_info.width;
*h = data->xinerama_info.height;
*rate = 0;
return;
}
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
*w = DisplayWidth(display, data->screen);
*h = DisplayHeight(display, data->screen);
*rate = 0;
}
static void
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set_best_resolution(Display * display, SDL_DisplayData * data, int w, int h,
int rate)
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{
int real_w, real_h, real_rate;
/* check current mode so we can avoid uneccessary mode changes */
get_real_resolution(display, data, &real_w, &real_h, &real_rate);
if (w == real_w && h == real_h && (!rate || rate == real_rate)) {
return;
}
#if SDL_VIDEO_DRIVER_X11_XRANDR
if (data->use_xrandr) {
#ifdef X11MODES_DEBUG
fprintf(stderr, "XRANDR: set_best_resolution(): w = %d, h = %d\n",
w, h);
#endif
int i, nsizes, nrates;
int best;
int best_rate;
XRRScreenSize *sizes;
short *rates;
/* find the smallest resolution that is at least as big as the user requested */
best = -1;
sizes = XRRConfigSizes(data->screen_config, &nsizes);
for (i = 0; i < nsizes; ++i) {
if (sizes[i].width < w || sizes[i].height < h) {
continue;
}
if (sizes[i].width == w && sizes[i].height == h) {
best = i;
break;
}
if (best == -1 ||
(sizes[i].width < sizes[best].width) ||
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(sizes[i].width == sizes[best].width
&& sizes[i].height < sizes[best].height)) {
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best = i;
}
}
if (best >= 0) {
best_rate = 0;
rates = XRRConfigRates(data->screen_config, best, &nrates);
for (i = 0; i < nrates; ++i) {
if (rates[i] == rate) {
best_rate = rate;
break;
}
if (!rate) {
/* Higher is better, right? */
if (rates[i] > best_rate) {
best_rate = rates[i];
}
} else {
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if (SDL_abs(rates[i] - rate) < SDL_abs(best_rate - rate)) {
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best_rate = rates[i];
}
}
}
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XRRSetScreenConfigAndRate(display, data->screen_config,
RootWindow(display, data->screen), best,
data->saved_rotation, best_rate,
CurrentTime);
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}
return;
}
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
654
#if SDL_VIDEO_DRIVER_X11_XVIDMODE
655
if (data->use_vidmode) {
656
XF86VidModeModeInfo ** modes;
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int i, nmodes;
int best;
660
if (XF86VidModeGetAllModeLines(display, data->screen, &nmodes, &modes)) {
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best = -1;
for (i = 0; i < nmodes; ++i) {
if (modes[i]->hdisplay < w || modes[i]->vdisplay < h) {
continue;
}
if (best == -1 ||
(modes[i]->hdisplay < modes[best]->hdisplay) ||
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(modes[i]->hdisplay == modes[best]->hdisplay
&& modes[i]->vdisplay < modes[best]->vdisplay)) {
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best = i;
continue;
}
if ((modes[i]->hdisplay == modes[best]->hdisplay) &&
(modes[i]->vdisplay == modes[best]->vdisplay)) {
if (!rate) {
/* Higher is better, right? */
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if (calculate_rate(modes[i]) >
calculate_rate(modes[best])) {
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best = i;
}
} else {
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if (SDL_abs(calculate_rate(modes[i]) - rate) <
SDL_abs(calculate_rate(modes[best]) - rate)) {
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best = i;
}
}
}
}
if (best >= 0) {
#ifdef X11MODES_DEBUG
printf("Best Mode %d: %d x %d @ %d\n", best,
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modes[best]->hdisplay, modes[best]->vdisplay,
calculate_rate(modes[best]));
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XF86VidModeSwitchToMode(display, data->screen, modes[best]);
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}
XFree(modes);
}
return;
}
701
#endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
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}
int
705
X11_SetDisplayMode(_THIS, SDL_VideoDisplay * sdl_display, SDL_DisplayMode * mode)
707
Display *display = ((SDL_VideoData *) _this->driverdata)->display;
708
SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
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set_best_resolution(display, data, mode->w, mode->h, mode->refresh_rate);
return 0;
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}
void
X11_QuitModes(_THIS)
{
}
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#endif /* SDL_VIDEO_DRIVER_X11 */
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/* vi: set ts=4 sw=4 expandtab: */