From 07221181ea8c47989efcc6eb3dfafff2b9ffb9c2 Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Thu, 16 Jun 2022 15:38:38 -0700
Subject: [PATCH] Qt: Fix VAO reinitialization

---
 src/platform/qt/DisplayGL.cpp | 7 +++++++
 src/platform/qt/DisplayGL.h   | 1 +
 2 files changed, 8 insertions(+)

diff --git a/src/platform/qt/DisplayGL.cpp b/src/platform/qt/DisplayGL.cpp
index 4691726bc..27183899d 100644
--- a/src/platform/qt/DisplayGL.cpp
+++ b/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();
 	}
 }
 
diff --git a/src/platform/qt/DisplayGL.h b/src/platform/qt/DisplayGL.h
index a75f1a8dd..007cf6165 100644
--- a/src/platform/qt/DisplayGL.h
+++ b/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;