GLSLV ?= glslangValidator
COMPILE.spv = $(GLSLV) $(GLSLVFLAGS)
%.spv: %.vert
	$(COMPILE.spv) $(OUTPUT_OPTION) $<
%.spv: %.frag
	$(COMPILE.spv) $(OUTPUT_OPTION) $<
%.o: %.spv
	$(LD) -r -b binary $(OUTPUT_OPTION) $<