main.cpp Example File

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#include <q3dsruntimeglobal.h> #include <Q3DSSurfaceViewer> #include <Q3DSPresentation> #include <QGuiApplication> #include <QOffscreenSurface> #include <QOpenGLContext> #include <QOpenGLFramebufferObject> #include <QThread> int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); QSurfaceFormat::setDefaultFormat(Q3DS::surfaceFormat()); QOpenGLContext context; if (!context.create()) qFatal("Failed to create OpenGL context"); // Must have a "surface". Depending on the platform this may be a small // window, pbuffer surface, or even nothing (in case surfaceless contexts are // supported) under the hood. QOffscreenSurface surface; surface.create(); if (!context.makeCurrent(&surface)) qFatal("makeCurrent failed"); const QSize size(1280, 800); QOpenGLFramebufferObject fbo(size, QOpenGLFramebufferObject::CombinedDepthStencil); Q3DSSurfaceViewer viewer; viewer.presentation()->setSource(QUrl(QStringLiteral("qrc:/barrel.uip"))); // Will call update() manually when a new frame is wanted. viewer.setUpdateInterval(-1); // Automatic sizing must be turned off. viewer.setAutoSize(false); // Provide the render target size instead. viewer.setSize(size); if (!viewer.create(&surface, &context, fbo.handle())) qFatal("Initialization failed"); // Render a few frames, read them back, and save into png files. for (int frame = 1; frame <= 20; ++frame) { // Render the next frame. viewer.update(); // Write it to a file. context.makeCurrent(&surface); const QString fn = QString(QLatin1String("output_%1.png")).arg(frame); fbo.toImage().save(fn); qDebug("Rendered and saved frame %d to %s", frame, qPrintable(fn)); // Keep events delivered on this (main) thread. QCoreApplication::processEvents(); // ### hack until QT3DS-1041 is in place QThread::msleep(10); } // Now one could do the following to generate a 60 fps video from these frames: // ffmpeg -r 60 -f image2 -s 1280x800 -i output_%d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p output.mp4 // ### this should not be needed. Qt3D should be able to shut down without it. QGuiApplication::processEvents(); return 0; }

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