FRAMES = 00 01 02 03 04 05
FRAMES_SUFFIX = .png
STAGE1_NAME = stage1-
STAGE2_NAME = stage2-
STAGE1_FILES := $(addprefix $(STAGE1_NAME),$(FRAMES))
STAGE1_FILES := $(addsuffix $(FRAMES_SUFFIX),$(STAGE1_FILES))
STAGE2_FILES := $(addprefix $(STAGE2_NAME),$(FRAMES))
STAGE2_FILES := $(addsuffix $(FRAMES_SUFFIX),$(STAGE2_FILES))

all: $(STAGE1_FILES) $(STAGE2_FILES) lain.mp4

lain-rainbow: lain-rainbow.c
	$(CC) -W -Wall -Werror -Wextra -std=c89 $^ -o $@ $(shell pkg-config --cflags --libs cairo cairo-svg)

$(STAGE1_NAME)%.png: lain-rainbow
	./lain-rainbow $*

$(STAGE2_NAME)%.png: $(STAGE1_NAME)%.png
	composite lain.png $(STAGE1_NAME)$*.png $(STAGE2_NAME)$*.png

lain.mp4: $(STAGE2_FILES)
	ffmpeg -re -stream_loop -1 -y -i "$(STAGE2_NAME)%02d.png" -vf 'zoompan=d=.5:s=3840x2160:fps=2,framerate=25:interp_start=0:interp_end=255:scene=100' -c:v mpeg4 -maxrate 5M -q:v 2 -t 0:0:3 $@

clean:
	$(RM) lain-rainbow $(STAGE1_FILES) $(STAGE2_FILES)