Have the original lighting system back and a little lightbulb model to show where the light is.

33-shadow-mapping/shaders/10.1.instancing.vs

@@ -0,0 +1,12 @@
+#version 330 core
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec2 aOffset;
+
+out vec3 fColor;
+
+void main()
+{
+    fColor = aColor;
+    gl_Position = vec4(aPos + aOffset, 0.0, 1.0);
+}