glfw/lib/x11/x11_fullscreen.c

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//========================================================================
// GLFW - An OpenGL framework
// Platform: X11/GLX
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// API version: 3.0
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// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.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.
//
//========================================================================
#include "internal.h"
#include <limits.h>
//************************************************************************
//**** GLFW internal functions ****
//************************************************************************
//========================================================================
// Convert BPP to RGB bits (based on "best guess")
//========================================================================
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static void BPP2RGB(int bpp, int *r, int *g, int *b)
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{
int delta;
// Special case: BPP = 32 (I don't think this is necessary for X11??)
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if (bpp == 32)
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bpp = 24;
// Convert "bits per pixel" to red, green & blue sizes
*r = *g = *b = bpp / 3;
delta = bpp - (*r * 3);
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if (delta >= 1)
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*g = *g + 1;
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if (delta == 2)
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*r = *r + 1;
}
//========================================================================
// Finds the video mode closest in size to the specified desired size
//========================================================================
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int _glfwGetClosestVideoMode(int screen, int *width, int *height, int *rate)
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{
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#if defined(_GLFW_HAS_XRANDR)
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int i, match, bestmatch;
int sizecount, bestsize;
int ratecount, bestrate;
short *ratelist;
XRRScreenConfiguration *sc;
XRRScreenSize *sizelist;
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if (_glfwLibrary.XRandR.available)
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{
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sc = XRRGetScreenInfo(_glfwLibrary.display,
RootWindow(_glfwLibrary.display, screen));
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sizelist = XRRConfigSizes(sc, &sizecount);
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// Find the best matching mode
bestsize = -1;
bestmatch = INT_MAX;
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for (i = 0; i < sizecount; i++)
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{
match = (*width - sizelist[i].width) *
(*width - sizelist[i].width) +
(*height - sizelist[i].height) *
(*height - sizelist[i].height);
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if (match < bestmatch)
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{
bestmatch = match;
bestsize = i;
}
}
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if (bestsize != -1)
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{
// Report width & height of best matching mode
*width = sizelist[bestsize].width;
*height = sizelist[bestsize].height;
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if (*rate > 0)
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{
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ratelist = XRRConfigRates(sc, bestsize, &ratecount);
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bestrate = -1;
bestmatch = INT_MAX;
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for (i = 0; i < ratecount; i++)
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{
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match = abs(ratelist[i] - *rate);
if (match < bestmatch)
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{
bestmatch = match;
bestrate = ratelist[i];
}
}
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if (bestrate != -1)
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*rate = bestrate;
}
}
// Free modelist
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XRRFreeScreenConfigInfo(sc);
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if (bestsize != -1)
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return bestsize;
}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo **modelist;
int modecount, i, bestmode, bestmatch, match;
// Use the XF86VidMode extension to control video resolution
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if (_glfwLibrary.XF86VidMode.available)
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{
// Get a list of all available display modes
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XF86VidModeGetAllModeLines(_glfwLibrary.display, screen,
&modecount, &modelist);
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// Find the best matching mode
bestmode = -1;
bestmatch = INT_MAX;
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for (i = 0; i < modecount; i++)
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{
match = (*width - modelist[i]->hdisplay) *
(*width - modelist[i]->hdisplay) +
(*height - modelist[i]->vdisplay) *
(*height - modelist[i]->vdisplay);
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if (match < bestmatch)
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{
bestmatch = match;
bestmode = i;
}
}
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if (bestmode != -1)
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{
// Report width & height of best matching mode
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*width = modelist[bestmode]->hdisplay;
*height = modelist[bestmode]->vdisplay;
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}
// Free modelist
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XFree(modelist);
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if (bestmode != -1)
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return bestmode;
}
#endif
// Default: Simply use the screen resolution
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*width = DisplayWidth(_glfwLibrary.display, screen);
*height = DisplayHeight(_glfwLibrary.display, screen);
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return 0;
}
//========================================================================
// Change the current video mode
//========================================================================
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void _glfwSetVideoModeMODE(int screen, int mode, int rate)
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{
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#if defined(_GLFW_HAS_XRANDR)
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XRRScreenConfiguration *sc;
Window root;
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if (_glfwLibrary.XRandR.available)
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{
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root = RootWindow(_glfwLibrary.display, screen);
sc = XRRGetScreenInfo(_glfwLibrary.display, root);
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// Remember old size and flag that we have changed the mode
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if (!_glfwWin.FS.modeChanged)
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{
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_glfwWin.FS.oldSizeID = XRRConfigCurrentConfiguration(sc, &_glfwWin.FS.oldRotation);
_glfwWin.FS.oldWidth = DisplayWidth(_glfwLibrary.display, screen);
_glfwWin.FS.oldHeight = DisplayHeight(_glfwLibrary.display, screen);
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_glfwWin.FS.modeChanged = GL_TRUE;
}
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if (rate > 0)
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{
// Set desired configuration
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XRRSetScreenConfigAndRate(_glfwLibrary.display,
sc,
root,
mode,
RR_Rotate_0,
(short) rate,
CurrentTime);
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}
else
{
// Set desired configuration
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XRRSetScreenConfig(_glfwLibrary.display,
sc,
root,
mode,
RR_Rotate_0,
CurrentTime);
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}
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XRRFreeScreenConfigInfo(sc);
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo **modelist;
int modecount;
// Use the XF86VidMode extension to control video resolution
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if (_glfwLibrary.XF86VidMode.available)
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{
// Get a list of all available display modes
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XF86VidModeGetAllModeLines(_glfwLibrary.display, screen,
&modecount, &modelist);
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// Unlock mode switch if necessary
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if (_glfwWin.FS.modeChanged)
XF86VidModeLockModeSwitch(_glfwLibrary.display, screen, 0);
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// Change the video mode to the desired mode
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XF86VidModeSwitchToMode(_glfwLibrary.display, screen,
modelist[mode]);
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// Set viewport to upper left corner (where our window will be)
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XF86VidModeSetViewPort(_glfwLibrary.display, screen, 0, 0);
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// Lock mode switch
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XF86VidModeLockModeSwitch(_glfwLibrary.display, screen, 1);
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// Remember old mode and flag that we have changed the mode
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if (!_glfwWin.FS.modeChanged)
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{
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_glfwWin.FS.oldMode = *modelist[0];
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_glfwWin.FS.modeChanged = GL_TRUE;
}
// Free mode list
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XFree(modelist);
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}
#endif
}
//========================================================================
// Change the current video mode
//========================================================================
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void _glfwSetVideoMode(int screen, int *width, int *height, int *rate)
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{
int bestmode;
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// Find a best match mode
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bestmode = _glfwGetClosestVideoMode(screen, width, height, rate);
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// Change mode
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_glfwSetVideoModeMODE(screen, bestmode, *rate);
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}
//========================================================================
// Restore the previously saved (original) video mode
//========================================================================
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void _glfwRestoreVideoMode(void)
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{
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if (_glfwWin.FS.modeChanged)
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{
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#if defined(_GLFW_HAS_XRANDR)
if (_glfwLibrary.XRandR.available)
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{
XRRScreenConfiguration *sc;
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if (_glfwLibrary.XRandR.available)
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{
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sc = XRRGetScreenInfo(_glfwLibrary.display, _glfwWin.root);
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XRRSetScreenConfig(_glfwLibrary.display,
sc,
_glfwWin.root,
_glfwWin.FS.oldSizeID,
_glfwWin.FS.oldRotation,
CurrentTime);
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XRRFreeScreenConfigInfo(sc);
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}
}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
if (_glfwLibrary.XF86VidMode.available)
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{
// Unlock mode switch
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XF86VidModeLockModeSwitch(_glfwLibrary.display, _glfwWin.screen, 0);
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// Change the video mode back to the old mode
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XF86VidModeSwitchToMode(_glfwLibrary.display,
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_glfwWin.screen,
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&_glfwWin.FS.oldMode);
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}
#endif
_glfwWin.FS.modeChanged = GL_FALSE;
}
}
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
struct _glfwResolution
{
int width;
int height;
};
//========================================================================
// List available video modes
//========================================================================
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int _glfwPlatformGetVideoModes(GLFWvidmode *list, int maxcount)
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{
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;
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#if defined(_GLFW_HAS_XRANDR)
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XRRScreenConfiguration *sc;
XRRScreenSize *sizelist;
int sizecount;
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#elif defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo **modelist;
int modecount, width, height;
#endif
// Get display and screen
dpy = _glfwLibrary.display;
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screen = DefaultScreen(dpy);
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// Get list of visuals
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vislist = XGetVisualInfo(dpy, 0, &dummy, &viscount);
if (vislist == NULL)
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return 0;
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rgbarray = (int*) malloc(sizeof(int) * viscount);
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rgbcount = 0;
// Build RGB array
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for (k = 0; k < viscount; k++)
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{
// Does the visual support OpenGL & true color?
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glXGetConfig(dpy, &vislist[k], GLX_USE_GL, &gl);
glXGetConfig(dpy, &vislist[k], GLX_RGBA, &rgba);
if (gl && rgba)
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{
// Get color depth for this visual
depth = vislist[k].depth;
// Convert to RGB
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BPP2RGB(depth, &r, &g, &b);
depth = (r << 16) | (g << 8) | b;
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// Is this mode unique?
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for (l = 0; l < rgbcount; l++)
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{
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if (depth == rgbarray[l])
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break;
}
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if (l >= rgbcount)
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{
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rgbarray[rgbcount] = depth;
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rgbcount++;
}
}
}
rescount = 0;
resarray = NULL;
// Build resolution array
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#if defined(_GLFW_HAS_XRANDR)
if (_glfwLibrary.XRandR.available)
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{
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sc = XRRGetScreenInfo(dpy, RootWindow(dpy, screen));
sizelist = XRRConfigSizes(sc, &sizecount);
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resarray = (struct _glfwResolution*) malloc(sizeof(struct _glfwResolution) * sizecount);
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for (k = 0; k < sizecount; k++)
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{
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resarray[rescount].width = sizelist[k].width;
resarray[rescount].height = sizelist[k].height;
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rescount++;
}
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XRRFreeScreenConfigInfo(sc);
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}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
if (_glfwLibrary.XF86VidMode.available)
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{
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XF86VidModeGetAllModeLines(dpy, screen, &modecount, &modelist);
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resarray = (struct _glfwResolution*) malloc(sizeof(struct _glfwResolution) * modecount);
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for (k = 0; k < modecount; k++)
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{
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width = modelist[k]->hdisplay;
height = modelist[k]->vdisplay;
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// Is this mode unique?
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for (l = 0; l < rescount; l++)
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{
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if (width == resarray[l].width && height == resarray[l].height)
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break;
}
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if (l >= rescount)
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{
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resarray[rescount].width = width;
resarray[rescount].height = height;
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rescount++;
}
}
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XFree(modelist);
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}
#endif
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if (!resarray)
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{
rescount = 1;
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resarray = (struct _glfwResolution*) malloc(sizeof(struct _glfwResolution) * rescount);
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resarray[ 0 ].width = DisplayWidth(dpy, screen);
resarray[ 0 ].height = DisplayHeight(dpy, screen);
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}
// Build permutations of colors and resolutions
count = 0;
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for (k = 0; k < rgbcount && count < maxcount; k++)
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{
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for (l = 0; l < rescount && count < maxcount; l++)
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{
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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;
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count++;
}
}
// Free visuals list
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XFree(vislist);
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free(resarray);
free(rgbarray);
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return count;
}
//========================================================================
// Get the desktop video mode
//========================================================================
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void _glfwPlatformGetDesktopMode(GLFWvidmode *mode)
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{
Display *dpy;
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int bpp, screen;
#if defined(_GLFW_HAS_XF86VIDMODE)
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XF86VidModeModeInfo **modelist;
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int modecount;
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#endif
// Get display and screen
dpy = _glfwLibrary.display;
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screen = DefaultScreen(dpy);
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// Get display depth
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bpp = DefaultDepth(dpy, screen);
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// Convert BPP to RGB bits
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BPP2RGB(bpp, &mode->RedBits, &mode->GreenBits, &mode->BlueBits);
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#if defined(_GLFW_HAS_XRANDR)
if (_glfwLibrary.XRandR.available)
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{
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if (_glfwWin.FS.modeChanged)
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{
mode->Width = _glfwWin.FS.oldWidth;
mode->Height = _glfwWin.FS.oldHeight;
return;
}
}
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#elif defined(_GLFW_HAS_XF86VIDMODE)
if (_glfwLibrary.XF86VidMode.available)
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{
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if (_glfwWin.FS.modeChanged)
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{
// 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
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XF86VidModeGetAllModeLines(dpy, screen, &modecount, &modelist);
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// The first mode in the list is the current (desktio) mode
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mode->Width = modelist[0]->hdisplay;
mode->Height = modelist[0]->vdisplay;
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// Free list
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XFree(modelist);
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}
return;
}
#endif
// Get current display width and height
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mode->Width = DisplayWidth(dpy, screen);
mode->Height = DisplayHeight(dpy, screen);
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}