Single light textureless phong shading complete.

assets/shaders/singleDiffuseLight/singleDiffuseLight_vert.glsl

@@ -1,16 +1,31 @@
 // Model-view matrix.
 uniform mat4 u_projTrans;
 
+// Normal matrix.
+uniform mat4 u_normalMat;
+
 // Vertex position in world coordinates.
 attribute vec4 a_position;
 
+// Vertex normal.
+attribute vec4 a_normal;
+
 // Vertex color.
 attribute vec4 a_color;
 
+// Vertex position to pass to the fragment shader.
+varying vec4 v_position;
+
+// Vertex normal to pass to the fragment shader.
+varying vec3 v_normal;
+
 // Vertex color to pass to the fragment shader.
 varying vec4 v_color;
 
 void main(){
+	v_position = u_projTrans * a_position;
 	v_color = a_color;
-	gl_Position = u_projTrans * a_position;
+	v_normal = vec3(u_normalMat * a_normal);
+
+	gl_Position = v_position;
 }