GLFW-0.2: glfw/lib/x11/x11_fullscreen.c
//========================================================================
// GLFW - An OpenGL framework
// File: x11_fullscreen.c
// Platform: X11 (Unix)
// API version: 2.6
// WWW: http://glfw.sourceforge.net
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Camilla Berglund
//
// 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.
//
//========================================================================
#include "internal.h"
//************************************************************************
//**** GLFW internal functions ****
//************************************************************************
//========================================================================
// _glfwBPP2RGB() - Convert BPP to RGB bits (based on "best guess")
//========================================================================
static void _glfwBPP2RGB( int bpp, int *r, int *g, int *b )
{
int delta;
// Special case: BPP = 32 (I don't think this is necessary for X11??)
if( bpp == 32 )
bpp = 24;
// Convert "bits per pixel" to red, green & blue sizes
*r = *g = *b = bpp / 3;
delta = bpp - (*r * 3);
if( delta >= 1 )
{
*g = *g + 1;
}
if( delta == 2 )
{
*r = *r + 1;
}
}
//========================================================================
// Finds the video mode closest in size to the specified desired size
//========================================================================
int _glfwGetClosestVideoMode( int screen, int *width, int *height, int *rate )
{
#if defined( _GLFW_HAS_XRANDR )
int i, match, bestmatch;
int sizecount, bestsize;
int ratecount, bestrate;
short *ratelist;
XRRScreenConfiguration *sc;
XRRScreenSize *sizelist;
if( _glfwLibrary.XRandR.Available )
{
sc = XRRGetScreenInfo( _glfwLibrary.Dpy,
RootWindow( _glfwLibrary.Dpy, screen ) );
sizelist = XRRConfigSizes( sc, &sizecount );
// Find the best matching mode
bestsize = -1;
bestmatch = 999999;
for( i = 0; i < sizecount; i++ )
{
match = (*width - sizelist[i].width) *
(*width - sizelist[i].width) +
(*height - sizelist[i].height) *
(*height - sizelist[i].height);
if( match < bestmatch )
{
bestmatch = match;
bestsize = i;
}
}
if( bestsize != -1 )
{
// Report width & height of best matching mode
*width = sizelist[bestsize].width;
*height = sizelist[bestsize].height;
if( *rate > 0 )
{
ratelist = XRRConfigRates( sc, bestsize, &ratecount );
bestrate = -1;
bestmatch = 999999;
for( i = 0; i < ratecount; i++ )
{
match = abs( ratelist[i] - *rate );
if( match < bestmatch )
{
bestmatch = match;
bestrate = ratelist[i];
}
}
if( bestrate != -1 )
{
*rate = bestrate;
}
}
}
// Free modelist
XRRFreeScreenConfigInfo( sc );
if( bestsize != -1 )
{
return bestsize;
}
}
#elif defined( _GLFW_HAS_XF86VIDMODE )
XF86VidModeModeInfo **modelist;
int modecount, i, bestmode, bestmatch, match;
// Use the XF86VidMode extension to control video resolution
if( _glfwLibrary.XF86VidMode.Available )
{
// Get a list of all available display modes
XF86VidModeGetAllModeLines( _glfwLibrary.Dpy, screen,
&modecount, &modelist );
// Find the best matching mode
bestmode = -1;
bestmatch = 999999;
for( i = 0; i < modecount; i++ )
{
match = (*width - modelist[i]->hdisplay) *
(*width - modelist[i]->hdisplay) +
(*height - modelist[i]->vdisplay) *
(*height - modelist[i]->vdisplay);
if( match < bestmatch )
{
bestmatch = match;
bestmode = i;
}
}
if( bestmode != -1 )
{
// Report width & height of best matching mode
*width = modelist[ bestmode ]->hdisplay;
*h = modelist[ bestmode ]->vdisplay;
}
// Free modelist
XFree( modelist );
if( bestmode != -1 )
{
return bestmode;
}
}
#endif
// Default: Simply use the screen resolution
*width = DisplayWidth( _glfwLibrary.Dpy, screen );
*height = DisplayHeight( _glfwLibrary.Dpy, screen );
return 0;
}
//========================================================================
// Change the current video mode
//========================================================================
void _glfwSetVideoModeMODE( int screen, int mode, int rate )
{
#if defined( _GLFW_HAS_XRANDR )
XRRScreenConfiguration *sc;
Window root;
if( _glfwLibrary.XRandR.Available )
{
root = RootWindow( _glfwLibrary.Dpy, screen );
sc = XRRGetScreenInfo( _glfwLibrary.Dpy, root );
// Remember old size and flag that we have changed the mode
if( !_glfwWin.FS.ModeChanged )
{
_glfwWin.FS.OldSizeID = XRRConfigCurrentConfiguration( sc, &_glfwWin.FS.OldRotation );
_glfwWin.FS.OldWidth = DisplayWidth( _glfwLibrary.Dpy, screen );
_glfwWin.FS.OldHeight = DisplayHeight( _glfwLibrary.Dpy, screen );
_glfwWin.FS.ModeChanged = GL_TRUE;
}
if( rate > 0 )
{
// Set desired configuration
XRRSetScreenConfigAndRate( _glfwLibrary.Dpy,
sc,
root,
mode,
RR_Rotate_0,
(short) rate,
CurrentTime );
}
else
{
// Set desired configuration
XRRSetScreenConfig( _glfwLibrary.Dpy,
sc,
root,
mode,
RR_Rotate_0,
CurrentTime );
}
XRRFreeScreenConfigInfo( sc );
}
#elif defined( _GLFW_HAS_XF86VIDMODE )
XF86VidModeModeInfo **modelist;
int modecount;
// Use the XF86VidMode extension to control video resolution
if( _glfwLibrary.XF86VidMode.Available )
{
// Get a list of all available display modes
XF86VidModeGetAllModeLines( _glfwLibrary.Dpy, screen,
&modecount, &modelist );
// Unlock mode switch if necessary
if( _glfwWin.FS.ModeChanged )
{
XF86VidModeLockModeSwitch( _glfwLibrary.Dpy, screen, 0 );
}
// Change the video mode to the desired mode
XF86VidModeSwitchToMode( _glfwLibrary.Dpy, screen,
modelist[ mode ] );
// Set viewport to upper left corner (where our window will be)
XF86VidModeSetViewPort( _glfwLibrary.Dpy, screen, 0, 0 );
// Lock mode switch
XF86VidModeLockModeSwitch( _glfwLibrary.Dpy, screen, 1 );
// Remember old mode and flag that we have changed the mode
if( !_glfwWin.FS.ModeChanged )
{
_glfwWin.FS.OldMode = *modelist[ 0 ];
_glfwWin.FS.ModeChanged = GL_TRUE;
}
// Free mode list
XFree( modelist );
}
#endif
}
//========================================================================
// Change the current video mode
//========================================================================
void _glfwSetVideoMode( int screen, int *width, int *height, int *rate )
{
int bestmode;
// Find a best match mode
bestmode = _glfwGetClosestVideoMode( screen, width, height, rate );
// Change mode
_glfwSetVideoModeMODE( screen, bestmode, *rate );
}
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
struct _glfwResolution {
int width;
int height;
};
//========================================================================
// List available video modes
//========================================================================
int _glfwPlatformGetVideoModes( GLFWvidmode *list, int maxcount )
{
int count, k, l, r, g, b, rgba, gl;
int depth, screen;
Display *dpy;
XVisualInfo *vislist, dummy;
int viscount, rgbcount, rescount;
int *rgbarray;
struct _glfwResolution *resarray;
#if defined( _GLFW_HAS_XRANDR )
XRRScreenConfiguration *sc;
XRRScreenSize *sizelist;
int sizecount;
#elif defined( _GLFW_HAS_XF86VIDMODE )
XF86VidModeModeInfo **modelist;
int modecount, width, height;
#endif
// Get display and screen
dpy = _glfwLibrary.Dpy;
screen = DefaultScreen( dpy );
// Get list of visuals
vislist = XGetVisualInfo( dpy, 0, &dummy, &viscount );
if( vislist == NULL )
{
return 0;
}
rgbarray = (int*) malloc( sizeof(int) * viscount );
rgbcount = 0;
// Build RGB array
for( k = 0; k < viscount; k++ )
{
// Does the visual support OpenGL & true color?
glXGetConfig( dpy, &vislist[k], GLX_USE_GL, &gl );
glXGetConfig( dpy, &vislist[k], GLX_RGBA, &rgba );
if( gl && rgba )
{
// Get color depth for this visual
depth = vislist[k].depth;
// Convert to RGB
_glfwBPP2RGB( depth, &r, &g, &b );
depth = (r<<16) | (g<<8) | b;
// Is this mode unique?
for( l = 0; l < rgbcount; l++ )
{
if( depth == rgbarray[ l ] )
{
break;
}
}
if( l >= rgbcount )
{
rgbarray[ rgbcount ] = depth;
rgbcount++;
}
}
}
rescount = 0;
resarray = NULL;
// Build resolution array
#if defined( _GLFW_HAS_XRANDR )
if( _glfwLibrary.XRandR.Available )
{
sc = XRRGetScreenInfo( dpy, RootWindow( dpy, screen ) );
sizelist = XRRConfigSizes( sc, &sizecount );
resarray = (struct _glfwResolution*) malloc( sizeof(struct _glfwResolution) * sizecount );
for( k = 0; k < sizecount; k++ )
{
resarray[ rescount ].width = sizelist[ k ].width;
resarray[ rescount ].height = sizelist[ k ].height;
rescount++;
}
XRRFreeScreenConfigInfo( sc );
}
#elif defined( _GLFW_HAS_XF86VIDMODE )
if( _glfwLibrary.XF86VidMode.Available )
{
XF86VidModeGetAllModeLines( dpy, screen, &modecount, &modelist );
resarray = (struct _glfwResolution*) malloc( sizeof(struct _glfwResolution) * modecount );
for( k = 0; k < modecount; k++ )
{
width = modelist[ k ]->hdisplay;
height = modelist[ k ]->vdisplay;
// Is this mode unique?
for( l = 0; l < rescount; l++ )
{
if( width == resarray[ l ].width && height == resarray[ l ].height )
{
break;
}
}
if( l >= rescount )
{
resarray[ rescount ].width = width;
resarray[ rescount ].height = height;
rescount++;
}
}
XFree( modelist );
}
#endif
if( !resarray )
{
rescount = 1;
resarray = (struct _glfwResolution*) malloc( sizeof(struct _glfwResolution) * rescount );
resarray[ 0 ].width = DisplayWidth( dpy, screen );
resarray[ 0 ].height = DisplayHeight( dpy, screen );
}
// Build permutations of colors and resolutions
count = 0;
for( k = 0; k < rgbcount && count < maxcount; k++ )
{
for( l = 0; l < rescount && count < maxcount; l++ )
{
list[count].Width = resarray[ l ].width;
list[count].Height = resarray[ l ].height;
list[count].RedBits = (rgbarray[ k ] >> 16) & 255;
list[count].GreenBits = (rgbarray[ k ] >> 8) & 255;
list[count].BlueBits = rgbarray[ k ] & 255;
count++;
}
}
// Free visuals list
XFree( vislist );
free( resarray );
free( rgbarray );
return count;
}
//========================================================================
// Get the desktop video mode
//========================================================================
void _glfwPlatformGetDesktopMode( GLFWvidmode *mode )
{
Display *dpy;
int bpp, screen;
#if defined( _GLFW_HAS_XF86VIDMODE )
XF86VidModeModeInfo **modelist;
int modecount;
#endif
// Get display and screen
dpy = _glfwLibrary.Dpy;
screen = DefaultScreen( dpy );
// Get display depth
bpp = DefaultDepth( dpy, screen );
// Convert BPP to RGB bits
_glfwBPP2RGB( bpp, &mode->RedBits, &mode->GreenBits, &mode->BlueBits );
#if defined( _GLFW_HAS_XRANDR )
if( _glfwLibrary.XRandR.Available )
{
if( _glfwWin.FS.ModeChanged )
{
mode->Width = _glfwWin.FS.OldWidth;
mode->Height = _glfwWin.FS.OldHeight;
return;
}
}
#elif defined( _GLFW_HAS_XF86VIDMODE )
if( _glfwLibrary.XF86VidMode.Available )
{
if( _glfwWin.FS.ModeChanged )
{
// The old (desktop) mode is stored in _glfwWin.FS.OldMode
mode->Width = _glfwWin.FS.OldMode.hdisplay;
mode->Height = _glfwWin.FS.OldMode.vdisplay;
}
else
{
// Use the XF86VidMode extension to get list of video modes
XF86VidModeGetAllModeLines( dpy, screen, &modecount,
&modelist );
// The first mode in the list is the current (desktio) mode
mode->Width = modelist[ 0 ]->hdisplay;
mode->Height = modelist[ 0 ]->vdisplay;
// Free list
XFree( modelist );
}
return;
}
#endif
// Get current display width and height
mode->Width = DisplayWidth( dpy, screen );
mode->Height = DisplayHeight( dpy, screen );
}