implemented light into cpp,

bug:
everything is dark,
need to calculate the normal matrix once in cpp and not for every pixel

QtMeshViewer/Header/OglViewerWidget.h

@@ -37,6 +37,11 @@ private:
 		bool z = true;
 	} m_rotDirections;
 
+	struct {
+		QVector3D position = { 1,1,1 };
+		QVector3D intensities = { 1,1,1 };
+	} m_light;
+
 	QOpenGLShaderProgram m_program;
 	GeometryEngine *m_dataEngine;
 

QtMeshViewer/Resources/fshader.glsl

@@ -6,6 +6,7 @@ precision mediump float;
 
 uniform mat3 n_matrix;
 uniform sampler2D texture;
+uniform mat4 m_matrix;
 
 uniform struct Light {
 	vec3 position;
@@ -20,7 +21,7 @@ varying vec3 v_normal;
 
 void main()
 {
-    
+	mat3 normalMatrix = transpose(inverse(mat3(m_matrix)));
 	vec3 normal = normalize(n_matrix * v_normal);
 
 	vec3 surfaceToLight = light.position - v_position;

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -225,6 +225,10 @@ void OglViewerWidget::paintGL()
 	// Set view-projection matrix
 	m_program.setUniformValue("vp_matrix", m_projection * view);
 
+	// Set Light
+	m_program.setUniformValue("light.position", m_light.position);
+	m_program.setUniformValue("light.intensities", m_light.intensities);
+
 	// Draw cube geometry
 	m_dataEngine->drawGeometry(&m_program, m_wireframe);
 }