kicad/include/gl_utils.h

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/*
* 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 <wx/glcanvas.h>
#include <wx/utils.h>
#include <limits>
class GL_UTILS
{
public:
/**
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* 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 )
{
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/// 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();
std::string vendor( reinterpret_cast<const char*>( glGetString( GL_VENDOR ) ) );
bool is_mesa = ( vendor.find( "Mesa" ) != std::string::npos );
if( !is_mesa && glXSwapIntervalEXT && glXQueryDrawable && dpy && drawable )
{
std::string exts( glXQueryExtensionsString( dpy, DefaultScreen( dpy ) ) );
if( aVal < 0 )
{
if( exts.find( "GLX_EXT_swap_control_tear" ) == std::string::npos )
{
aVal = 0;
}
else
{
// Even though the extensions might be available,
// we need to be sure that late/adaptive swaps are
// enabled on the drawable.
unsigned lateSwapsEnabled = 0;
glXQueryDrawable( dpy, drawable, GLX_LATE_SWAPS_TEAR_EXT, &lateSwapsEnabled );
if( !lateSwapsEnabled )
{
aVal = 0;
}
}
}
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();
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#else
return 0;
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#endif
}
};
#endif /* GL_CONTEXT_MANAGER_H */