Anti-aliasing patch for the 3D-Viewer from Martin Janitschke

    ReCreateMainToolbar();

    // Make a EDA_3D_CANVAS

    int attrs[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_DEPTH_SIZE, 16,

                    WX_GL_STENCIL_SIZE, 1, 0 };

    int attrs[] = { // 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.

                    // 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

    unsigned int ii;

    // Check if the canvas supports multisampling.

    if( EDA_3D_CANVAS::IsDisplaySupported( attrs ) )

    {

        // Check for possible sample sizes, start form the top.

        int maxSamples = 8; // Any higher doesn't change anything.

        int samplesOffset = 0;

        for( ii = 0; ii < sizeof( attrs ) / sizeof( attrs[0] ) - 1; ii += 2 )

        {

            if( attrs[ii] == WX_GL_SAMPLES )

            {

                samplesOffset = ii+1;

                break;

            }

        }

        attrs[samplesOffset] = maxSamples;

        for( ; maxSamples > 0 && !EDA_3D_CANVAS::IsDisplaySupported( attrs );

            maxSamples = maxSamples>>1 )

        {

            attrs[samplesOffset] = maxSamples;

        }

    }

    else

    {

        // Disable multisampling

        for( ii = 0; ii < sizeof( attrs ) / sizeof( attrs[0] ) - 1; ii += 2 )

        {

            if( attrs[ii] == WX_GL_SAMPLE_BUFFERS )

            {

                attrs[ii+1] = 0;

                break;

            }

        }

    }

    m_canvas = new EDA_3D_CANVAS( this, attrs );

    m_auimgr.SetManagedWindow( this );