Should this program use the texture map_diffuse?

Property definitions

gamnit $ BlinnPhongProgram :: use_map_diffuse
	# Should this program use the texture `map_diffuse`?
	var use_map_diffuse = uniforms["use_map_diffuse"].as(UniformBool) is lazy
lib/gamnit/depth/more_materials.nit:545,2--546,74