115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2020 Kicad Developers, see AUTHORS.txt for contributors
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-3.0.html
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* or you may search the http://www.gnu.org website for the version 3 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef GL_UTILS_H
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#define GL_UTILS_H
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#include <gal/opengl/kiglew.h> // Must be included first
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#include <wx/utils.h>
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#include <limits>
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class GL_UTILS
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{
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public:
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/**
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* Attempts to set the OpenGL swap interval.
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*
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* @param aVal if -1 = try to set adaptive swapping, 0 = sync off, 1 = sync with VSYNC rate.
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* @return actual value set
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*/
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static int SetSwapInterval( int aVal )
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{
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/// This routine is written for Linux using X11 only. The equivalent functions under
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/// Windows would include <wglext.h> and call wglSwapIntervalEXT
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#if defined( __linux__ ) && !defined( KICAD_USE_EGL )
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/// Do not try to set the swapping over remote connections
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/// Video drivers lie and then crash when they can't handle the adaptive swapping
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if( wxGetEnv( wxT( "SSH_CONNECTION"), nullptr ) )
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return 0;
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Display *dpy = glXGetCurrentDisplay();
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GLXDrawable drawable = glXGetCurrentDrawable();
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if( glXSwapIntervalEXT && glXQueryDrawable && dpy && drawable )
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{
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if( aVal < 0 )
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{
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if( !GLX_EXT_swap_control_tear )
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{
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aVal = 0;
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}
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else
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{
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// Even though the extensions might be available,
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// we need to be sure that late/adaptive swaps are
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// enabled on the drawable.
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unsigned lateSwapsEnabled;
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glXQueryDrawable( dpy, drawable, GLX_LATE_SWAPS_TEAR_EXT, &lateSwapsEnabled );
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if( !lateSwapsEnabled )
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{
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aVal = 0;
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}
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}
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}
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unsigned clampedInterval;
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glXSwapIntervalEXT( dpy, drawable, aVal );
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glXQueryDrawable( dpy, drawable, GLX_SWAP_INTERVAL_EXT, &clampedInterval );
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return clampedInterval;
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}
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if( glXSwapIntervalMESA &&glXGetSwapIntervalMESA )
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{
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if( aVal < 0 )
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aVal = 0;
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glXSwapIntervalMESA( aVal );
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return glXGetSwapIntervalMESA();
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}
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if( glXSwapIntervalSGI )
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{
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if( aVal < 1 )
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aVal = 1;
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if( glXSwapIntervalSGI( aVal ) )
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glXSwapIntervalSGI( 1 );
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return 1;
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}
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return std::numeric_limits<int>::max();
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#else
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return 0;
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#endif
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}
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};
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#endif /* GL_CONTEXT_MANAGER_H */
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