mirror of
https://github.com/gnif/LookingGlass.git
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64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
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/*
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KVMGFX Client - A KVM Client for VGA Passthrough
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Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <GL/glx.h>
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int sysinfo_gfx_max_multisample()
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{
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Display * dpy = XOpenDisplay(NULL);
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if (!dpy)
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return -1;
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XVisualInfo queryTemplate;
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queryTemplate.screen = 0;
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int visualCount;
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int maxSamples = -1;
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XVisualInfo * visuals = XGetVisualInfo(dpy, VisualScreenMask, &queryTemplate, &visualCount);
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for (int i = 0; i < visualCount; i++)
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{
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XVisualInfo * visual = &visuals[i];
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int res, supportsGL;
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// Some GLX visuals do not use GL, and these must be ignored in our search.
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if ((res = glXGetConfig(dpy, visual, GLX_USE_GL, &supportsGL)) != 0 || !supportsGL)
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continue;
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int sampleBuffers, samples;
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if ((res = glXGetConfig(dpy, visual, GLX_SAMPLE_BUFFERS, &sampleBuffers)) != 0)
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continue;
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// Will be 1 if this visual supports multisampling
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if (sampleBuffers != 1)
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continue;
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if ((res = glXGetConfig(dpy, visual, GLX_SAMPLES, &samples)) != 0)
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continue;
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// Track the largest number of samples supported
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if (samples > maxSamples)
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maxSamples = samples;
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}
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XCloseDisplay(dpy);
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return maxSamples;
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}
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