我想禁用vsyncQOpenGLContext 格式，以便于集成第三方渲染系统。
QSurfaceFormat::swapInterval似乎是 Qt 中唯一相关的参数。
我尝试了几种方法来实现这一点，但即使我QSurfaceFormat::swapInterval(0)在早期阶段（在QMainWindow构造之前）设置了，那么QOpenGLContext::create()调用正在恢复它。
// at application startup, before creating the Qt windows (or in MyQWindow constructor)
QSurfaceFormat format;
format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
format.setRedBufferSize(8);
format.setGreenBufferSize(8);
format.setBlueBufferSize(8);
format.setAlphaBufferSize(8);
format.setDepthBufferSize(24);
format.setStencilBufferSize(8);
format.setSwapInterval(0);
QSurfaceFormat::setDefaultFormat(format);
QMainWindow *w = new QMainWindow;
w->show();
// at QWindow with QOpenGLContext creation, at the first frame update (or at the constructor)
MyQWindow::initialization() {
WbOpenGLContext *c = new WbOpenGLContext(this);
c->setFormat(requestedFormat());
qDebug() << "requested format:" << c->format();
c->create();
qDebug() << "actual format:" << c->format();
}
# output
requested format: QSurfaceFormat(
version 2.0,
options QFlags(),
depthBufferSize 24,
redBufferSize 8,
greenBufferSize 8,
blueBufferSize 8,
alphaBufferSize 8,
stencilBufferSize 8,
samples -1,
swapBehavior 2,
swapInterval 0,
profile 0
)
context format: QSurfaceFormat(
version 3.0,
options QFlags(0x4),
depthBufferSize 24,
redBufferSize 8,
greenBufferSize 8,
blueBufferSize 8,
alphaBufferSize 8,
stencilBufferSize 8,
samples 0,
swapBehavior 2,
swapInterval 1, # Not what I asked
profile 0
)
有没有办法强制禁用 vsync？