art_LOCAL_PATH := $(call whereami)

art_SPRITES := $(wildcard $(art_LOCAL_PATH)/*.png)
art_SPR_DATA := $(addprefix $(OUT)/,$(art_SPRITES:%.png=%.cspr))
art_SPR_SRC := $(OUT)/$(art_LOCAL_PATH)/sprites.c
art_SPR_HDR := $(OUT)/$(art_LOCAL_PATH)/sprites.h

BUILT_SRCS_C += $(art_SPR_SRC)
INCLUDE += $(OUT)/$(art_LOCAL_PATH)
BUILT_SRCS += $(art_SPR_HDR)

$(OUT)/%.cspr: %.png
	@echo "SPRITE: $@"
	@mkdir -p $(dir $@)
	@ConvertImg --format n2dlib $< > $@

$(art_SPR_SRC): $(art_SPR_DATA)
	@echo "Catting sprites into sprites.c"
	@rm -f $@
	@cat $^ | sed "s/^static uint16_t/unsigned short/" >> $@

$(art_SPR_HDR): $(art_SPR_SRC)
	@echo "Making header sprites.h"
	@cat $< | grep "=" | sed -e "s/ =.*/;/" -e "s/^/extern /" > $@