Ensure light is normalised

src/shader/shaders.c

@@ -179,7 +179,10 @@ internal M4x4f get_projection_matrix(ProjectionType projection_type) {
 }
 
 internal f32 get_intensity(const V3f *normal) {
-  f32 intensity = dot_v3((*normal), g_light_dir);
+  V3f light = g_light_dir;
+  normalise_v3(light);
+
+  f32 intensity = dot_v3((*normal), light);
   if (intensity < 0.0f) {
     intensity = 0.001f;
   }