kicad/3d-viewer/common_ogl/cogl_att_list.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015 Mario Luzeiro <mrluzeiro@ua.pt>
* Copyright (C) 1992-2015 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-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file cogl_att_list.cpp
* @brief Implements a attribute list support for openGL
*/
#include "cogl_att_list.h"
/**
* Attributes list to be passed to a wxGLCanvas creation.
*
* This array should be 2*n+1
* Sadly wxwidgets / glx < 13 allowed
* a thing named "boolean attributes" that don't take a value.
* (See src/unix/glx11.cpp -> wxGLCanvasX11::ConvertWXAttrsToGL() ).
* To avoid problems due to this, just specify those attributes twice.
* Only WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_STEREO are such boolean
* attributes.
*/
const int COGL_ATT_LIST::m_openGL_AttributesList[] = {
// Boolean attributes (using itself at padding):
WX_GL_RGBA, WX_GL_RGBA,
WX_GL_DOUBLEBUFFER, WX_GL_DOUBLEBUFFER,
// Normal attributes with values:
WX_GL_DEPTH_SIZE, 16,
WX_GL_STENCIL_SIZE, 1,
WX_GL_SAMPLE_BUFFERS, 1, // Enable multisampling support (antialiasing).
WX_GL_SAMPLES, 0, // Disable AA for the start.
0 // NULL termination
};
int COGL_ATT_LIST::m_openGL_AttributesList_toUse[
sizeof( COGL_ATT_LIST::m_openGL_AttributesList )] = { 0 };
const int *COGL_ATT_LIST::GetAttributesList( bool aUseAntiAliasing )
{
memcpy( m_openGL_AttributesList_toUse,
m_openGL_AttributesList,
sizeof( m_openGL_AttributesList_toUse ) );
if( aUseAntiAliasing )
{
// Check if the canvas supports multisampling.
if( wxGLCanvas::IsDisplaySupported( m_openGL_AttributesList_toUse ) )
{
// Check for possible sample sizes, start form the top.
int maxSamples = 8; // Any higher doesn't change anything.
int samplesOffset = 0;
for( unsigned int ii = 0;
ii < DIM( m_openGL_AttributesList_toUse );
ii += 2 )
{
if( m_openGL_AttributesList_toUse[ii] == WX_GL_SAMPLES )
{
samplesOffset = ii + 1;
break;
}
}
m_openGL_AttributesList_toUse[samplesOffset] = maxSamples;
for( ; maxSamples > 0 &&
!wxGLCanvas::IsDisplaySupported( m_openGL_AttributesList_toUse );
maxSamples = maxSamples >> 1 )
{
m_openGL_AttributesList_toUse[samplesOffset] = maxSamples;
}
}
else
aUseAntiAliasing = false;
}
// Disable antialising if it failed or was not requested
if( !aUseAntiAliasing )
{
// Disable multisampling
for( unsigned int ii = 0;
ii < DIM( m_openGL_AttributesList_toUse );
ii += 2 )
{
if( m_openGL_AttributesList_toUse[ii] == WX_GL_SAMPLE_BUFFERS )
{
m_openGL_AttributesList_toUse[ii + 1] = 0;
break;
}
}
}
return m_openGL_AttributesList_toUse;
}