void *QGLContext::chooseVisual()
{
static int bufDepths[] = { 8, 4, 2, 1 }; // Try 16, 12 also?
//todo: if pixmap, also make sure that vi->depth == pixmap->depth
void* vis = 0;
int i = 0;
bool fail = FALSE;
QGLFormat fmt = format();
bool tryDouble = !fmt.doubleBuffer(); // Some GL impl's only have double
bool triedDouble = FALSE;
while( !fail && !( vis = tryVisual( fmt, bufDepths[i] ) ) ) {
if ( !fmt.rgba() && bufDepths[i] > 1 ) {
i++;
continue;
}
if ( tryDouble ) {
fmt.setDoubleBuffer( TRUE );
tryDouble = FALSE;
triedDouble = TRUE;
continue;
}
else if ( triedDouble ) {
fmt.setDoubleBuffer( FALSE );
triedDouble = FALSE;
}
if ( fmt.stereo() ) {
fmt.setStereo( FALSE );
continue;
}
if ( fmt.accum() ) {
fmt.setAccum( FALSE );
continue;
}
if ( fmt.stencil() ) {
fmt.setStencil( FALSE );
continue;
}
if ( fmt.alpha() ) {
fmt.setAlpha( FALSE );
continue;
}
if ( fmt.depth() ) {
fmt.setDepth( FALSE );
continue;
}
if ( fmt.doubleBuffer() ) {
fmt.setDoubleBuffer( FALSE );
continue;
}
fail = TRUE;
}
glFormat = fmt;
return vis;
}
/*
See qgl.cpp for qdoc comment.
*/
void *QGLContext::chooseVisual()
{
Q_D(QGLContext);
static const int bufDepths[] = { 8, 4, 2, 1 }; // Try 16, 12 also?
//todo: if pixmap, also make sure that vi->depth == pixmap->depth
void* vis = 0;
int i = 0;
bool fail = false;
QGLFormat fmt = format();
bool tryDouble = !fmt.doubleBuffer(); // Some GL impl's only have double
bool triedDouble = false;
bool triedSample = false;
if (fmt.sampleBuffers())
fmt.setSampleBuffers(QGLExtensions::glExtensions & QGLExtensions::SampleBuffers);
while(!fail && !(vis = tryVisual(fmt, bufDepths[i]))) {
if (!fmt.rgba() && bufDepths[i] > 1) {
i++;
continue;
}
if (tryDouble) {
fmt.setDoubleBuffer(true);
tryDouble = false;
triedDouble = true;
continue;
} else if (triedDouble) {
fmt.setDoubleBuffer(false);
triedDouble = false;
}
if (!triedSample && fmt.sampleBuffers()) {
fmt.setSampleBuffers(false);
triedSample = true;
continue;
}
if (fmt.stereo()) {
fmt.setStereo(false);
continue;
}
if (fmt.accum()) {
fmt.setAccum(false);
continue;
}
if (fmt.stencil()) {
fmt.setStencil(false);
continue;
}
if (fmt.alpha()) {
fmt.setAlpha(false);
continue;
}
if (fmt.depth()) {
fmt.setDepth(false);
continue;
}
if (fmt.doubleBuffer()) {
fmt.setDoubleBuffer(false);
continue;
}
fail = true;
}
d->glFormat = fmt;
return vis;
}
