kicad/include/gl_utils.h

85 lines
2.6 KiB
C++

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