/*!
\since 4.8
Returns a platform window format for the OpenGL format specified by \a format.
*/
QPlatformWindowFormat QGLFormat::toPlatformWindowFormat(const QGLFormat &format)
{
QPlatformWindowFormat retFormat;
retFormat.setAccum(format.accum());
if (format.accumBufferSize() >= 0)
retFormat.setAccumBufferSize(format.accumBufferSize());
retFormat.setAlpha(format.alpha());
if (format.alphaBufferSize() >= 0)
retFormat.setAlphaBufferSize(format.alphaBufferSize());
if (format.blueBufferSize() >= 0)
retFormat.setBlueBufferSize(format.blueBufferSize());
retFormat.setDepth(format.depth());
if (format.depthBufferSize() >= 0)
retFormat.setDepthBufferSize(format.depthBufferSize());
retFormat.setDirectRendering(format.directRendering());
retFormat.setDoubleBuffer(format.doubleBuffer());
if (format.greenBufferSize() >= 0)
retFormat.setGreenBufferSize(format.greenBufferSize());
if (format.redBufferSize() >= 0)
retFormat.setRedBufferSize(format.redBufferSize());
retFormat.setRgba(format.rgba());
retFormat.setSampleBuffers(format.sampleBuffers());
if (format.samples() >= 0)
retFormat.setSamples(format.samples());
retFormat.setStencil(format.stencil());
if (format.stencilBufferSize() >= 0)
retFormat.setStencilBufferSize(format.stencilBufferSize());
retFormat.setStereo(format.stereo());
retFormat.setSwapInterval(format.swapInterval());
return retFormat;
}
static void qt_format_to_attrib_list(const QGLFormat &f, int attribs[])
{
int i = 0;
attribs[i++] = GLX_RENDER_TYPE;
attribs[i++] = GLX_RGBA_BIT;
attribs[i++] = GLX_DRAWABLE_TYPE;
attribs[i++] = GLX_PBUFFER_BIT;
attribs[i++] = GLX_RED_SIZE;
attribs[i++] = f.redBufferSize() == -1 ? 1 : f.redBufferSize();
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = f.greenBufferSize() == -1 ? 1 : f.greenBufferSize();
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = f.blueBufferSize() == -1 ? 1 : f.blueBufferSize();
if (f.doubleBuffer()) {
attribs[i++] = GLX_DOUBLEBUFFER;
attribs[i++] = true;
}
if (f.depth()) {
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = f.depthBufferSize() == -1 ? 1 : f.depthBufferSize();
}
if (f.stereo()) {
attribs[i++] = GLX_STEREO;
attribs[i++] = true;
}
if (f.stencil()) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = f.stencilBufferSize() == -1 ? 1 : f.stencilBufferSize();
}
if (f.alpha()) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = f.alphaBufferSize() == -1 ? 1 : f.alphaBufferSize();
}
if (f.accum()) {
attribs[i++] = GLX_ACCUM_RED_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
if (f.alpha()) {
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
attribs[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
}
}
if (f.sampleBuffers()) {
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
attribs[i++] = 1;
attribs[i++] = GLX_SAMPLES_ARB;
attribs[i++] = f.samples() == -1 ? 4 : f.samples();
}
attribs[i] = XNone;
}
GLFormat::GLFormat(const QGLFormat & format)
: m_majorVersion(format.majorVersion())
, m_minorVersion(format.minorVersion())
, m_redBufferSize (format.redBufferSize())
, m_greenBufferSize(format.greenBufferSize())
, m_blueBufferSize (format.blueBufferSize())
, m_alphaBufferSize(format.alpha() ? format.alphaBufferSize() : 0)
, m_depthBufferSize (format.depth() ? format.depthBufferSize() : 0)
, m_stencilBufferSize(format.stencil() ? format.stencilBufferSize() : 0)
, m_doubleBuffer(format.doubleBuffer())
, m_stereo(format.stereo())
, m_sampleBuffers(format.sampleBuffers())
, m_samples(format.samples())
, m_swapInterval(format.swapInterval())
{
switch(format.profile())
{
default:
case QGLFormat::NoProfile:
m_profile = NoProfile;
break;
case QGLFormat::CoreProfile:
m_profile = CoreProfile;
break;
case QGLFormat::CompatibilityProfile:
m_profile = CompatibilityProfile;
break;
};
}
QT_BEGIN_NAMESPACE
void qt_eglproperties_set_glformat(QEglProperties& eglProperties, const QGLFormat& glFormat)
{
int redSize = glFormat.redBufferSize();
int greenSize = glFormat.greenBufferSize();
int blueSize = glFormat.blueBufferSize();
int alphaSize = glFormat.alphaBufferSize();
int depthSize = glFormat.depthBufferSize();
int stencilSize = glFormat.stencilBufferSize();
int sampleCount = glFormat.samples();
// QGLFormat uses a magic value of -1 to indicate "don't care", even when a buffer of that
// type has been requested. So we must check QGLFormat's booleans too if size is -1:
if (glFormat.alpha() && alphaSize <= 0)
alphaSize = 1;
if (glFormat.depth() && depthSize <= 0)
depthSize = 1;
if (glFormat.stencil() && stencilSize <= 0)
stencilSize = 1;
if (glFormat.sampleBuffers() && sampleCount <= 0)
sampleCount = 1;
// We want to make sure 16-bit configs are chosen over 32-bit configs as they will provide
// the best performance. The EGL config selection algorithm is a bit stange in this regard:
// The selection criteria for EGL_BUFFER_SIZE is "AtLeast", so we can't use it to discard
// 32-bit configs completely from the selection. So it then comes to the sorting algorithm.
// The red/green/blue sizes have a sort priority of 3, so they are sorted by first. The sort
// order is special and described as "by larger _total_ number of color bits.". So EGL will
// put 32-bit configs in the list before the 16-bit configs. However, the spec also goes on
// to say "If the requested number of bits in attrib_list for a particular component is 0,
// then the number of bits for that component is not considered". This part of the spec also
// seems to imply that setting the red/green/blue bits to zero means none of the components
// are considered and EGL disregards the entire sorting rule. It then looks to the next
// highest priority rule, which is EGL_BUFFER_SIZE. Despite the selection criteria being
// "AtLeast" for EGL_BUFFER_SIZE, it's sort order is "smaller" meaning 16-bit configs are
// put in the list before 32-bit configs. So, to make sure 16-bit is preffered over 32-bit,
// we must set the red/green/blue sizes to zero. This has an unfortunate consequence that
// if the application sets the red/green/blue size to 5/6/5 on the QGLFormat, they will
// probably get a 32-bit config, even when there's an RGB565 config avaliable. Oh well.
// Now normalize the values so -1 becomes 0
redSize = redSize > 0 ? redSize : 0;
greenSize = greenSize > 0 ? greenSize : 0;
blueSize = blueSize > 0 ? blueSize : 0;
alphaSize = alphaSize > 0 ? alphaSize : 0;
depthSize = depthSize > 0 ? depthSize : 0;
stencilSize = stencilSize > 0 ? stencilSize : 0;
sampleCount = sampleCount > 0 ? sampleCount : 0;
eglProperties.setValue(EGL_RED_SIZE, redSize);
eglProperties.setValue(EGL_GREEN_SIZE, greenSize);
eglProperties.setValue(EGL_BLUE_SIZE, blueSize);
eglProperties.setValue(EGL_ALPHA_SIZE, alphaSize);
eglProperties.setValue(EGL_DEPTH_SIZE, depthSize);
eglProperties.setValue(EGL_STENCIL_SIZE, stencilSize);
eglProperties.setValue(EGL_SAMPLES, sampleCount);
eglProperties.setValue(EGL_SAMPLE_BUFFERS, sampleCount ? 1 : 0);
}
/*!
Returns a window format for the OpenGL format specified by \a format.
*/
QSurfaceFormat QGLFormat::toSurfaceFormat(const QGLFormat &format)
{
QSurfaceFormat retFormat;
if (format.alpha())
retFormat.setAlphaBufferSize(format.alphaBufferSize() == -1 ? 1 : format.alphaBufferSize());
if (format.blueBufferSize() >= 0)
retFormat.setBlueBufferSize(format.blueBufferSize());
if (format.greenBufferSize() >= 0)
retFormat.setGreenBufferSize(format.greenBufferSize());
if (format.redBufferSize() >= 0)
retFormat.setRedBufferSize(format.redBufferSize());
if (format.depth())
retFormat.setDepthBufferSize(format.depthBufferSize() == -1 ? 1 : format.depthBufferSize());
retFormat.setSwapBehavior(format.doubleBuffer() ? QSurfaceFormat::DoubleBuffer : QSurfaceFormat::DefaultSwapBehavior);
if (format.sampleBuffers())
retFormat.setSamples(format.samples() == -1 ? 4 : format.samples());
if (format.stencil())
retFormat.setStencilBufferSize(format.stencilBufferSize() == -1 ? 1 : format.stencilBufferSize());
retFormat.setStereo(format.stereo());
return retFormat;
}
/*!
Returns a window format for the OpenGL format specified by \a format.
*/
QSurfaceFormat QGLFormat::toSurfaceFormat(const QGLFormat &format)
{
QSurfaceFormat retFormat;
if (format.alpha())
retFormat.setAlphaBufferSize(format.alphaBufferSize() == -1 ? 1 : format.alphaBufferSize());
if (format.blueBufferSize() >= 0)
retFormat.setBlueBufferSize(format.blueBufferSize());
if (format.greenBufferSize() >= 0)
retFormat.setGreenBufferSize(format.greenBufferSize());
if (format.redBufferSize() >= 0)
retFormat.setRedBufferSize(format.redBufferSize());
if (format.depth())
retFormat.setDepthBufferSize(format.depthBufferSize() == -1 ? 1 : format.depthBufferSize());
retFormat.setSwapBehavior(format.doubleBuffer() ? QSurfaceFormat::DoubleBuffer : QSurfaceFormat::DefaultSwapBehavior);
if (format.sampleBuffers())
retFormat.setSamples(format.samples() == -1 ? 4 : format.samples());
if (format.stencil())
retFormat.setStencilBufferSize(format.stencilBufferSize() == -1 ? 1 : format.stencilBufferSize());
retFormat.setStereo(format.stereo());
retFormat.setMajorVersion(format.majorVersion());
retFormat.setMinorVersion(format.minorVersion());
retFormat.setProfile(static_cast<QSurfaceFormat::OpenGLContextProfile>(format.profile()));
return retFormat;
}
void GraphicsWindowQt::qglFormat2traits( const QGLFormat& format, osg::GraphicsContext::Traits* traits )
{
traits->red = format.redBufferSize();
traits->green = format.greenBufferSize();
traits->blue = format.blueBufferSize();
traits->alpha = format.alpha() ? format.alphaBufferSize() : 0;
traits->depth = format.depth() ? format.depthBufferSize() : 0;
traits->stencil = format.stencil() ? format.stencilBufferSize() : 0;
traits->sampleBuffers = format.sampleBuffers() ? 1 : 0;
traits->samples = format.samples();
traits->quadBufferStereo = format.stereo();
traits->doubleBuffer = format.doubleBuffer();
traits->vsync = format.swapInterval() >= 1;
}
string glinfo::
pretty_format(const QGLFormat& f)
{
QGLFormat::OpenGLVersionFlags flag = f.openGLVersionFlags();
stringstream s;
s << "accum=" << f.accum() << endl
<< "accumBufferSize=" << f.accumBufferSize() << endl
<< "alpha=" << f.alpha() << endl
<< "alphaBufferSize=" << f.alphaBufferSize() << endl
<< "blueBufferSize=" << f.blueBufferSize() << endl
<< "depth=" << f.depth() << endl
<< "depthBufferSize=" << f.depthBufferSize() << endl
<< "directRendering=" << f.directRendering() << endl
<< "doubleBuffer=" << f.doubleBuffer() << endl
<< "greenBufferSize=" << f.greenBufferSize() << endl
<< "hasOverlay=" << f.hasOverlay() << endl
<< "redBufferSize=" << f.redBufferSize() << endl
<< "rgba=" << f.rgba() << endl
<< "sampleBuffers=" << f.sampleBuffers() << endl
<< "samples=" << f.samples() << endl
<< "stencil=" << f.stencil() << endl
<< "stencilBufferSize=" << f.stencilBufferSize() << endl
<< "stereo=" << f.stereo() << endl
<< "swapInterval=" << f.swapInterval() << endl
<< "" << endl
<< "hasOpenGL=" << f.hasOpenGL() << endl
<< "hasOpenGLOverlays=" << f.hasOpenGLOverlays() << endl
<< "OpenGL_Version_None=" << (QGLFormat::OpenGL_Version_None == flag) << endl
<< "OpenGL_Version_1_1=" << (QGLFormat::OpenGL_Version_1_1 & flag) << endl
<< "OpenGL_Version_1_2=" << (QGLFormat::OpenGL_Version_1_2 & flag) << endl
<< "OpenGL_Version_1_3=" << (QGLFormat::OpenGL_Version_1_3 & flag) << endl
<< "OpenGL_Version_1_4=" << (QGLFormat::OpenGL_Version_1_4 & flag) << endl
<< "OpenGL_Version_1_5=" << (QGLFormat::OpenGL_Version_1_5 & flag) << endl
<< "OpenGL_Version_2_0=" << (QGLFormat::OpenGL_Version_2_0 & flag) << endl
<< "OpenGL_Version_2_1=" << (QGLFormat::OpenGL_Version_2_1 & flag) << endl
<< "OpenGL_Version_3_0=" << (QGLFormat::OpenGL_Version_3_0 & flag) << endl
<< "OpenGL_ES_CommonLite_Version_1_0=" << (QGLFormat::OpenGL_ES_CommonLite_Version_1_0 & flag) << endl
<< "OpenGL_ES_Common_Version_1_0=" << (QGLFormat::OpenGL_ES_Common_Version_1_0 & flag) << endl
<< "OpenGL_ES_CommonLite_Version_1_1=" << (QGLFormat::OpenGL_ES_CommonLite_Version_1_1 & flag) << endl
<< "OpenGL_ES_Common_Version_1_1=" << (QGLFormat::OpenGL_ES_Common_Version_1_1 & flag) << endl
<< "OpenGL_ES_Version_2_0=" << (QGLFormat::OpenGL_ES_Version_2_0 & flag) << endl;
return s.str();
}
static void qt_format_to_attrib_list(bool has_render_texture, const QGLFormat &f, int attribs[])
{
int i = 0;
attribs[i++] = WGL_SUPPORT_OPENGL_ARB;
attribs[i++] = TRUE;
attribs[i++] = WGL_DRAW_TO_PBUFFER_ARB;
attribs[i++] = TRUE;
if (has_render_texture) {
attribs[i++] = WGL_BIND_TO_TEXTURE_RGBA_ARB;
attribs[i++] = TRUE;
}
attribs[i++] = WGL_COLOR_BITS_ARB;
attribs[i++] = 32;
attribs[i++] = WGL_DOUBLE_BUFFER_ARB;
attribs[i++] = FALSE;
if (f.stereo()) {
attribs[i++] = WGL_STEREO_ARB;
attribs[i++] = TRUE;
}
if (f.depth()) {
attribs[i++] = WGL_DEPTH_BITS_ARB;
attribs[i++] = f.depthBufferSize() == -1 ? 24 : f.depthBufferSize();
}
if (f.redBufferSize() != -1) {
attribs[i++] = WGL_RED_BITS_ARB;
attribs[i++] = f.redBufferSize();
}
if (f.greenBufferSize() != -1) {
attribs[i++] = WGL_GREEN_BITS_ARB;
attribs[i++] = f.greenBufferSize();
}
if (f.blueBufferSize() != -1) {
attribs[i++] = WGL_BLUE_BITS_ARB;
attribs[i++] = f.blueBufferSize();
}
if (f.alpha()) {
attribs[i++] = WGL_ALPHA_BITS_ARB;
attribs[i++] = f.alphaBufferSize() == -1 ? 8 : f.alphaBufferSize();
}
if (f.accum()) {
attribs[i++] = WGL_ACCUM_BITS_ARB;
attribs[i++] = f.accumBufferSize() == -1 ? 16 : f.accumBufferSize();
}
if (f.stencil()) {
attribs[i++] = WGL_STENCIL_BITS_ARB;
attribs[i++] = f.stencilBufferSize() == -1 ? 8 : f.stencilBufferSize();
}
if ((f.redBufferSize() > 8 || f.greenBufferSize() > 8
|| f.blueBufferSize() > 8 || f.alphaBufferSize() > 8)
&& (QGLExtensions::glExtensions() & QGLExtensions::NVFloatBuffer))
{
attribs[i++] = WGL_FLOAT_COMPONENTS_NV;
attribs[i++] = TRUE;
}
if (f.sampleBuffers()) {
attribs[i++] = WGL_SAMPLE_BUFFERS_ARB;
attribs[i++] = 1;
attribs[i++] = WGL_SAMPLES_ARB;
attribs[i++] = f.samples() == -1 ? 16 : f.samples();
}
attribs[i] = 0;
}
/*
========================
getDriverInfoString
fills the GL info widget with text
========================
*/
QString CGLWidget::getDriverInfoString( void ) const
{
// the context must be valied!
if( !context()->isValid() )
return QString( "<invalid OpenGL context>" );
// read OpenGL infos
QString text;
text += tr( "Vendor: %1\n" ).arg( (const char*)glGetString( GL_VENDOR ) );
text += tr( "Renderer: %1\n" ).arg( (const char*)glGetString( GL_RENDERER ) );
text += tr( "Version: %1\n" ).arg( (const char*)glGetString( GL_VERSION ) );
text += tr( "\n" );
// print framebuffer format
QGLFormat fmt = context()->format();
text += tr( "Framebuffer Format:\n" );
text += tr( " RGBA bits: (%1,%2,%3,%4)\n" ).
arg( fmt.redBufferSize() ).
arg( fmt.greenBufferSize() ).
arg( fmt.blueBufferSize() ).
arg( fmt.alphaBufferSize() );
text += tr( " Depth bits: %1\n" ).arg( fmt.depthBufferSize() );
text += tr( " Stencil bits: %1\n" ).arg( fmt.stencilBufferSize() );
text += tr( "\n" );
// shading language version
if( fmt.openGLVersionFlags() & fmt.OpenGL_Version_2_0 )
{
QString version( (const char*)glGetString( GL_SHADING_LANGUAGE_VERSION ) );
text += QString( "Shading Language Version: %1\n" ).arg( version );
}
// check for geometry shader
bool hasGeoShader = false;
#ifdef CONFIG_ENABLE_GEOMETRY_SHADER
hasGeoShader = ( NULL != strstr( (const char*)glGetString( GL_EXTENSIONS ), "GL_EXT_geometry_shader4" ) );
if( hasGeoShader )
{
text += tr( "GL_EXT_geometry_shader4 available\n" );
}
else
{
text += tr( "GL_EXT_geometry_shader4 not supported\n" );
}
#endif
text += tr( "\n" );
GLint i;
#define PRINT_CONSTANT(Name) \
glGetIntegerv( Name, &i ); \
text += tr( #Name " = %1\n" ).arg( i );
PRINT_CONSTANT( GL_MAX_TEXTURE_SIZE );
PRINT_CONSTANT( GL_MAX_TEXTURE_UNITS );
PRINT_CONSTANT( GL_MAX_VERTEX_ATTRIBS );
PRINT_CONSTANT( GL_MAX_VERTEX_UNIFORM_COMPONENTS );
PRINT_CONSTANT( GL_MAX_VARYING_FLOATS ); // alias for GL_MAX_VARYING_COMPONENTS_EXT
PRINT_CONSTANT( GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS );
PRINT_CONSTANT( GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS );
PRINT_CONSTANT( GL_MAX_TEXTURE_IMAGE_UNITS );
PRINT_CONSTANT( GL_MAX_TEXTURE_COORDS );
PRINT_CONSTANT( GL_MAX_FRAGMENT_UNIFORM_COMPONENTS );
if( hasGeoShader )
{
PRINT_CONSTANT( GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS_EXT );
PRINT_CONSTANT( GL_MAX_GEOMETRY_VARYING_COMPONENTS_EXT );
PRINT_CONSTANT( GL_MAX_VERTEX_VARYING_COMPONENTS_EXT );
PRINT_CONSTANT( GL_MAX_VARYING_COMPONENTS_EXT );
PRINT_CONSTANT( GL_MAX_GEOMETRY_UNIFORM_COMPONENTS_EXT) ;
PRINT_CONSTANT( GL_MAX_GEOMETRY_OUTPUT_VERTICES_EXT );
PRINT_CONSTANT( GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS_EXT );
}
#undef PRINT_CONSTANT
return text;
}
AGLPixelFormat QGLContextPrivate::tryFormat(const QGLFormat &format)
{
GLint attribs[40], cnt = 0;
bool device_is_pixmap = (paintDevice->devType() == QInternal::Pixmap);
attribs[cnt++] = AGL_RGBA;
attribs[cnt++] = AGL_BUFFER_SIZE;
attribs[cnt++] = device_is_pixmap ? static_cast<QPixmap *>(paintDevice)->depth() : 32;
attribs[cnt++] = AGL_LEVEL;
attribs[cnt++] = format.plane();
if (format.redBufferSize() != -1) {
attribs[cnt++] = AGL_RED_SIZE;
attribs[cnt++] = format.redBufferSize();
}
if (format.greenBufferSize() != -1) {
attribs[cnt++] = AGL_GREEN_SIZE;
attribs[cnt++] = format.greenBufferSize();
}
if (format.blueBufferSize() != -1) {
attribs[cnt++] = AGL_BLUE_SIZE;
attribs[cnt++] = format.blueBufferSize();
}
if (device_is_pixmap) {
attribs[cnt++] = AGL_PIXEL_SIZE;
attribs[cnt++] = static_cast<QPixmap *>(paintDevice)->depth();
attribs[cnt++] = AGL_OFFSCREEN;
if(!format.alpha()) {
attribs[cnt++] = AGL_ALPHA_SIZE;
attribs[cnt++] = 8;
}
} else {
if(format.doubleBuffer())
attribs[cnt++] = AGL_DOUBLEBUFFER;
}
if(glFormat.stereo())
attribs[cnt++] = AGL_STEREO;
if(format.alpha()) {
attribs[cnt++] = AGL_ALPHA_SIZE;
attribs[cnt++] = format.alphaBufferSize() == -1 ? 8 : format.alphaBufferSize();
}
if(format.stencil()) {
attribs[cnt++] = AGL_STENCIL_SIZE;
attribs[cnt++] = format.stencilBufferSize() == -1 ? 8 : format.stencilBufferSize();
}
if(format.depth()) {
attribs[cnt++] = AGL_DEPTH_SIZE;
attribs[cnt++] = format.depthBufferSize() == -1 ? 32 : format.depthBufferSize();
}
if(format.accum()) {
attribs[cnt++] = AGL_ACCUM_RED_SIZE;
attribs[cnt++] = format.accumBufferSize() == -1 ? 1 : format.accumBufferSize();
attribs[cnt++] = AGL_ACCUM_BLUE_SIZE;
attribs[cnt++] = format.accumBufferSize() == -1 ? 1 : format.accumBufferSize();
attribs[cnt++] = AGL_ACCUM_GREEN_SIZE;
attribs[cnt++] = format.accumBufferSize() == -1 ? 1 : format.accumBufferSize();
attribs[cnt++] = AGL_ACCUM_ALPHA_SIZE;
attribs[cnt++] = format.accumBufferSize() == -1 ? 1 : format.accumBufferSize();
}
if(format.sampleBuffers()) {
attribs[cnt++] = AGL_SAMPLE_BUFFERS_ARB;
attribs[cnt++] = 1;
attribs[cnt++] = AGL_SAMPLES_ARB;
attribs[cnt++] = format.samples() == -1 ? 4 : format.samples();
}
attribs[cnt] = AGL_NONE;
Q_ASSERT(cnt < 40);
return aglChoosePixelFormat(0, 0, attribs);
}