CXX = g++
CXXFLAGS = -Wall -O2

.PHONY: all clean remake

all: graytrace

clean:
	rm -f graytrace graytrace.o lodepng.o

remake: clean all


graytrace: lodepng.o graytrace.cpp graytrace.o
	$(CXX) $(CXXFLAGS) graytrace.o lodepng.o -o graytrace

lodepng.o: lodepng.cpp lodepng.h
	$(CXX) $(CXXFLAGS) -c -o lodepng.o lodepng.cpp

lodepng.cpp:
	@if ! test -e lodepng.cpp; then \
		/bin/echo -n Downloading lodepng...\ ; \
		curl -s 'https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.cpp' >lodepng.cpp; \
		curl -s 'https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.h' >lodepng.h; \
		/bin/echo done.; \
	fi