QtQuick sample - fix GL_INVALID_ENUM errors within OpenGl_Context::init()

gkv311 · gkv311 · commit 69ff8d9c8ffa · 2025-12-18T09:28:25.000+03:00
diff --git a/occt-qtquick/OcctQQuickFramebufferViewer.cpp b/occt-qtquick/OcctQQuickFramebufferViewer.cpp
@@ -421,13 +421,14 @@ void OcctQQuickFramebufferViewer::initializeGL(QOpenGLFramebufferObject* theFbo)
   const Graphic3d_Vec2i aViewSize(theFbo->size().width(), theFbo->size().height());
 
   const bool isFirstInit = myView->Window().IsNull();
+  theFbo->bindDefault(); // initialize OpenGl_Context with default (window) FBO
   if (!OcctGlTools::InitializeGlWindow(myView, aNativeWin, aViewSize, aQWindow->devicePixelRatio()))
   {
     Q_EMIT glCriticalError("OpenGl_Context is unable to wrap OpenGL context");
     return;
   }
 
-  theFbo->bind();
+  theFbo->bind(); // rebind offscreen FBO
   dumpGlInfo(true, true);
   if (isFirstInit)
   {

Original file line number	Diff line number	Diff line change
`@@ -421,13 +421,14 @@ void OcctQQuickFramebufferViewer::initializeGL(QOpenGLFramebufferObject* theFbo)`
`421`	`421`	`const Graphic3d_Vec2i aViewSize(theFbo->size().width(), theFbo->size().height());`
`422`	`422`
`423`	`423`	`const bool isFirstInit = myView->Window().IsNull();`
	`424`	`+ theFbo->bindDefault(); // initialize OpenGl_Context with default (window) FBO`
`424`	`425`	`if (!OcctGlTools::InitializeGlWindow(myView, aNativeWin, aViewSize, aQWindow->devicePixelRatio()))`
`425`	`426`	`{`
`426`	`427`	`Q_EMIT glCriticalError("OpenGl_Context is unable to wrap OpenGL context");`
`427`	`428`	`return;`
`428`	`429`	`}`
`429`	`430`
`430`		`- theFbo->bind();`
	`431`	`+ theFbo->bind(); // rebind offscreen FBO`
`431`	`432`	`dumpGlInfo(true, true);`
`432`	`433`	`if (isFirstInit)`
`433`	`434`	`{`