kicad/include/gl_utils.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
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* Copyright (C) 2020-2022 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>
#ifdef _WIN32
#pragma optimize( "", off )
#endif
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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#if defined( __linux__ ) && !defined( KICAD_USE_EGL )
if( Display* dpy = glXGetCurrentDisplay() )
{
GLXDrawable drawable = glXGetCurrentDrawable();
std::string exts( glXQueryExtensionsString( dpy, DefaultScreen( dpy ) ) );
if( glXSwapIntervalEXT && glXQueryDrawable && drawable
&& exts.find( "GLX_EXT_swap_control" ) != std::string::npos )
{
if( aVal == -1 )
{
if( exts.find( "GLX_EXT_swap_control_tear" ) == std::string::npos )
{
aVal = 1;
}
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
&& exts.find( "GLX_MESA_swap_control" ) != std::string::npos )
{
if( aVal == -1 )
aVal = 1;
if( !glXSwapIntervalMESA( aVal ) )
return aVal;
}
if( glXSwapIntervalSGI && exts.find( "GLX_SGI_swap_control" ) != std::string::npos )
{
if( aVal == -1 )
aVal = 1;
if( !glXSwapIntervalSGI( aVal ) )
return aVal;
}
}
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#elif defined( _WIN32 )
const GLubyte* vendor = glGetString( GL_VENDOR );
//const GLubyte* renderer = glGetString( GL_RENDERER );
const GLubyte* version = glGetString( GL_VERSION );
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if( wglSwapIntervalEXT && wxGLCanvas::IsExtensionSupported( "WGL_EXT_swap_control" ) )
{
wxString vendorStr = vendor;
wxString versionStr = version;
if( aVal == -1 && ( !wxGLCanvas::IsExtensionSupported( "WGL_EXT_swap_control_tear" ) ) )
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aVal = 1;
// Trying to enable adaptive swapping on AMD drivers from 2017 or older leads to crash
if( aVal == -1 && vendorStr == wxS( "ATI Technologies Inc." ) )
{
wxArrayString parts = wxSplit( versionStr.AfterLast( ' ' ), '.', 0 );
if( parts.size() == 4 )
{
long majorVer = 0;
if( parts[0].ToLong( &majorVer ) )
{
if( majorVer <= 22 )
aVal = 1;
}
}
}
HDC hdc = wglGetCurrentDC();
HGLRC hglrc = wglGetCurrentContext();
if( hdc && hglrc )
{
int currentInterval = wglGetSwapIntervalEXT();
if( currentInterval != aVal )
{
wglSwapIntervalEXT( aVal );
currentInterval = wglGetSwapIntervalEXT();
}
return currentInterval;
}
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}
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#endif
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return 0;
}
};
#ifdef _WIN32
#pragma optimize( "", on )
#endif
#endif /* GL_CONTEXT_MANAGER_H */