Qt: Fix VAO reinitialization

src/platform/qt/DisplayGL.cpp

@@ -82,6 +82,8 @@ void mGLWidget::initializeGL() {
 	m_program->setUniformValue("tex", 0);
 	m_positionLocation = m_program->attributeLocation("position");
 
+	m_vaoDone = false;
+
 	connect(&m_refresh, &QTimer::timeout, this, static_cast<void (QWidget::*)()>(&QWidget::update));
 }
 
@@ -98,6 +100,10 @@ void mGLWidget::finalizeVAO() {
 	}
 }
 
+void mGLWidget::reset() {
+	m_vaoDone = false;
+}
+
 void mGLWidget::paintGL() {
 	if (!m_vaoDone) {
 		finalizeVAO();
@@ -210,6 +216,7 @@ void DisplayGL::startDrawing(std::shared_ptr<CoreController> controller) {
 		}
 	} else {
 		show();
+		m_gl->reset();
 	}
 }
 

src/platform/qt/DisplayGL.h

@@ -53,6 +53,7 @@ public:
 	void setTex(GLuint tex) { m_tex = tex; }
 	void setVBO(GLuint vbo) { m_vbo = vbo; }
 	void finalizeVAO();
+	void reset();
 
 protected:
 	void initializeGL() override;