CODEC_URL := https://github.com/BinomialLLC/basis_universal/archive/refs/tags/v1.15_rel2.tar.gz
CODEC_DIR := node_modules/basis
CODEC_BUILD_DIR := $(CODEC_DIR)/build
CODEC_LIB := $(CODEC_BUILD_DIR)/basis.a
ENVIRONMENT = worker

OUT_JS := enc/basis_enc.js dec/basis_dec.js
OUT_WASM := $(OUT_JS:.js=.wasm)

# TODO: Go back to -O3
COMMON_FLAGS := -O0 -g -fno-strict-aliasing

override 	CXXFLAGS += $(COMMON_FLAGS)
override 	CFLAGS += $(COMMAN_FLAGS)

CODEC_CPP_SOURCE_FILES := \
	encoder/basisu_comp.cpp \
	encoder/basisu_enc.cpp \
	encoder/basisu_backend.cpp \
	encoder/basisu_basis_file.cpp \
	encoder/basisu_etc.cpp \
	encoder/basisu_uastc_enc.cpp \
	encoder/basisu_gpu_texture.cpp \
	encoder/basisu_frontend.cpp \
	encoder/basisu_bc7enc.cpp \
	encoder/basisu_pvrtc1_4.cpp \
	encoder/basisu_astc_decomp.cpp \
	encoder/basisu_global_selector_palette_helpers.cpp \
	encoder/basisu_resampler.cpp \
	encoder/basisu_kernels_sse.cpp \
	encoder/jpgd.cpp \
	encoder/lodepng.cpp \
	transcoder/basisu_transcoder.cpp

CODEC_C_SOURCE_FILES := \
	encoder/apg_bmp.c \
	zstd/zstd.c

# TODO: Remove me
override CXXFLAGS += -DBASISU_FORCE_DEVEL_MESSAGES=1

.PHONY: all clean

all: $(CODEC_DIR) $(OUT_JS)

# Define dependencies for all variations of build artifacts.
$(filter enc/%,$(OUT_JS)): enc/basis_enc.cpp
$(filter dec/%,$(OUT_JS)): dec/basis_dec.cpp

# TODO: Make it build for node
# enc/mozjpeg_node_enc.js dec/mozjpeg_node_dec.js: ENVIRONMENT = node

%.js: $(CODEC_LIB)
	$(CXX) \
		-I $(CODEC_DIR)/encoder \
		-I $(CODEC_DIR)/transcoder \
		${CXXFLAGS} \
		${LDFLAGS} \
		--closure 1 \
		--bind \
		-s ALLOW_MEMORY_GROWTH=1 \
		-s MODULARIZE=1 \
		-s TEXTDECODER=2 \
		-s ENVIRONMENT=$(ENVIRONMENT) \
		-s EXPORT_ES6=1 \
		-o $@ \
		$+ 

$(CODEC_LIB): $(CODEC_DIR)
	mkdir -p $(CODEC_BUILD_DIR)
	cd $(CODEC_BUILD_DIR) && \
	$(CXX) \
		${CXXFLAGS} \
		-c $(addprefix ../, $(CODEC_CPP_SOURCE_FILES))
	cd $(CODEC_BUILD_DIR) && \
	$(CC) \
		${CFLAGS} \
		-c $(addprefix ../, $(CODEC_C_SOURCE_FILES))
	$(AR) rc $(CODEC_LIB) $(CODEC_BUILD_DIR)/*.o

$(CODEC_DIR):
	mkdir -p $@
	curl -sL $(CODEC_URL) | tar xz --strip 1 -C $@

clean:
	$(RM) -r $(OUT_JS) $(OUT_WASM) $(CODEC_BUILD_DIR)