fixed backface culling bug,

todo: connect headligh

QtMeshViewer/Form Files/SettingsWindow.ui

@@ -530,9 +530,6 @@
         <property name="text">
          <string>Backface Culling</string>
         </property>
-        <property name="checked">
-         <bool>true</bool>
-        </property>
        </widget>
       </item>
      </layout>

QtMeshViewer/Header/GeometryEngine.h

@@ -36,7 +36,7 @@ private:
 	void clearData();
 
 public:
-	void drawGeometry(QOpenGLShaderProgram *program, bool wireframe);
+	void drawGeometry(QOpenGLShaderProgram *program);
 	void loadFile(QString filePath);
 
 // signals

QtMeshViewer/Header/OglViewerWidget.h

@@ -27,6 +27,7 @@ private:
 
 	bool m_wireframe = false;
 	bool m_lightOn = false;
+	bool m_backfaceCulling = false;
 
 	struct {
 		QVector4D position = { 1,1,1,0 };

QtMeshViewer/Source/GeometryEngine.cpp

@@ -51,7 +51,7 @@ void GeometryEngine::clearData()
 	m_drawList.clear();
 }
 
-void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program, bool wireframe)
+void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program)
 {
 	if (!m_arrayBuf.isCreated() || !m_indexBuf.isCreated())
 		return;
@@ -133,12 +133,8 @@ void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program, bool wireframe)
 		program->setUniformValue("materialSpecularColor", specularColor);
 
 		// Draw cube geometry using indices from VBO 1
-		if (wireframe)
-			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-
 		glDrawElements(GL_TRIANGLES, it.size, GL_UNSIGNED_INT, (void*)(it.offset * sizeof(GLuint)));
 
-		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 	}
 }
 

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -94,7 +94,7 @@ void OglViewerWidget::initializeGL()
 
 	//TODO: does not work
 	// Enable back face culling
-	glEnable(GL_CULL_FACE);
+	//glEnable(GL_CULL_FACE);
 
 	// Enable transparency
 	glEnable(GL_BLEND);
@@ -164,7 +164,16 @@ void OglViewerWidget::paintGL()
 	m_program.setUniformValue("cameraPosition", rotateBack * (-m_translation));
 
 	// Draw cube geometry
-	m_dataEngine->drawGeometry(&m_program, m_wireframe);
+	if (m_backfaceCulling)
+		glEnable(GL_CULL_FACE);
+
+	if (m_wireframe)
+		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+
+	m_dataEngine->drawGeometry(&m_program);
+
+	glDisable(GL_CULL_FACE);
+	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 }
 
 // Inputs ///////////////////////////////////////////////////////////////
@@ -410,11 +419,7 @@ void OglViewerWidget::setAmbCoef(double value)
 
 void OglViewerWidget::setBackfaceCulling(bool value)
 {
-	if (value)
-		glCullFace(GL_FRONT_AND_BACK);
-	else if(!value)
-		glCullFace(GL_FRONT);
-
+	m_backfaceCulling = value;
 	update();
 }