#
# Makefile
#

include Config.mk

.DEFAULT_GOAL=all
.PHONY: circle-stdlib mt32emu fluidsynth emusc all clean veryclean

#
# Functions to apply/reverse patches only if not completely applied/reversed already
#
APPLY_PATCH=sh -c '																\
	if patch --dry-run --reverse --force --strip 1 --directory $$1 < $$2 >/dev/null 2>&1; then						\
		echo "Patch $$2 already applied; skipping";											\
	else																	\
		echo "Applying patch $$2 to directory $$1...";											\
		patch --forward --strip 1 --no-backup-if-mismatch -r - --directory $$1 < $$2 || (echo "Patch $$2 failed" >&2 && exit 1);	\
	fi' APPLY_PATCH

REVERSE_PATCH=sh -c '																\
	if patch --dry-run --forward --force --strip 1 --directory $$1 < $$2 >/dev/null 2>&1; then						\
		echo "Patch $$2 already reversed; skipping";											\
	else																	\
		echo "Reversing patch $$2 in directory $$1...";											\
		patch --reverse --strip 1 --no-backup-if-mismatch -r - --directory $$1 < $$2 || (echo "Patch $$2 failed" >&2 && exit 1);	\
	fi' REVERSE_PATCH

#
# Configure circle-stdlib
#
$(CIRCLE_STDLIB_CONFIG) $(CIRCLE_CONFIG)&:
	@echo "Configuring for Raspberry Pi $(RASPBERRYPI) ($(BITS) bit)"
	$(CIRCLESTDLIBHOME)/configure --raspberrypi=$(RASPBERRYPI) --prefix=$(PREFIX)-

# Apply patches
	@${APPLY_PATCH} $(CIRCLEHOME) patches/circle-45-minimal-usb-drivers.patch
	@${APPLY_PATCH} $(CIRCLEHOME) patches/circle-45-cp210x-remove-partnum-check.patch
	@${APPLY_PATCH} $(CIRCLEHOME) patches/circle-45-zone-allocator.patch

ifeq ($(strip $(GC_SECTIONS)),1)
# Enable function/data sections for circle-stdlib
	@echo "CFLAGS_FOR_TARGET += -ffunction-sections -fdata-sections" >> $(CIRCLE_STDLIB_CONFIG)
endif

# Enable multi-core
	@echo "DEFINE += -DARM_ALLOW_MULTI_CORE" >> $(CIRCLE_CONFIG)

# Disable delay loop calibration (boot speed improvement)
	@echo "DEFINE += -DNO_CALIBRATE_DELAY" >> $(CIRCLE_CONFIG)

# Improve I/O throughput
	@echo "DEFINE += -DNO_BUSY_WAIT" >> $(CIRCLE_CONFIG)

# Enable PWM audio output on GPIO 12/13 for the Pi Zero 2 W
	@echo "DEFINE += -DUSE_PWM_AUDIO_ON_ZERO" >> $(CIRCLE_CONFIG)

	# Zone allocator tags
	echo "DEFINE += -DHEAP_ZONE_TAGS=FluidSynth" >> $(CIRCLE_CONFIG)

#
# Build circle-stdlib
#
circle-stdlib: $(CIRCLESTDLIBHOME)/.done

$(CIRCLESTDLIBHOME)/.done: $(CIRCLE_STDLIB_CONFIG)
	@$(MAKE) -C $(CIRCLESTDLIBHOME)
	touch $@

#
# Build mt32emu
#
mt32emu: $(MT32EMUBUILDDIR)/.done

$(MT32EMUBUILDDIR)/.done: $(CIRCLESTDLIBHOME)/.done
	@CFLAGS="$(CFLAGS_FOR_TARGET)" \
	CXXFLAGS="$(CFLAGS_FOR_TARGET)" \
	cmake  -B $(MT32EMUBUILDDIR) \
			$(CMAKE_TOOLCHAIN_FLAGS) \
			-DCMAKE_CXX_FLAGS_RELEASE="-Ofast" \
			-DCMAKE_BUILD_TYPE=Release \
			-Dlibmt32emu_C_INTERFACE=FALSE \
			-Dlibmt32emu_SHARED=FALSE \
			$(MT32EMUHOME) \
			>/dev/null
	@cmake --build $(MT32EMUBUILDDIR)
	@touch $@

#
# Build FluidSynth
#
fluidsynth: $(FLUIDSYNTHBUILDDIR)/.done

$(FLUIDSYNTHBUILDDIR)/.done: $(CIRCLESTDLIBHOME)/.done
	@${APPLY_PATCH} $(FLUIDSYNTHHOME) patches/fluidsynth-2.3.1-circle.patch

	@CFLAGS="$(CFLAGS_FOR_TARGET)" \
	cmake  -B $(FLUIDSYNTHBUILDDIR) \
			$(CMAKE_TOOLCHAIN_FLAGS) \
			-DCMAKE_C_FLAGS_RELEASE="-Ofast -fopenmp-simd" \
			-DCMAKE_BUILD_TYPE=Release \
			-DBUILD_SHARED_LIBS=OFF \
			-Denable-aufile=OFF \
			-Denable-dbus=OFF \
			-Denable-dsound=OFF \
			-Denable-floats=ON \
			-Denable-ipv6=OFF \
			-Denable-jack=OFF \
			-Denable-ladspa=OFF \
			-Denable-libinstpatch=OFF \
			-Denable-libsndfile=OFF \
			-Denable-midishare=OFF \
			-Denable-network=OFF \
			-Denable-oboe=OFF \
			-Denable-openmp=OFF \
			-Denable-opensles=OFF \
			-Denable-oss=OFF \
			-Denable-pipewire=OFF \
			-Denable-pulseaudio=OFF \
			-Denable-readline=OFF \
			-Denable-sdl2=OFF \
			-Denable-threads=OFF \
			-Denable-waveout=OFF \
			-Denable-winmidi=OFF \
			$(FLUIDSYNTHHOME) \
			>/dev/null
	@cmake --build $(FLUIDSYNTHBUILDDIR) --target libfluidsynth
	@touch $@

#
# Build EmuSC
#
emusc: $(EMUSCBUILDDIR)/.done

$(EMUSCBUILDDIR)/.done: $(CIRCLESTDLIBHOME)/.done
	@mkdir -p $(EMUSCBUILDDIR)
	@cd $(EMUSCBUILDDIR) \
	&& $(EMUSCHOME)/autogen.sh \
	&& export CFLAGS="-Wl,--unresolved-symbols=ignore-all" \
	&& export CXXFLAGS="$(CFLAGS_FOR_TARGET) -std=c++14 -Ofast" \
	&& $(EMUSCHOME)/configure --host $(PREFIX) --prefix $$(realpath .) \
	&& make install
	@touch $@


# EMUSCFILES:=config control_rom midi_input part pcm_rom synth
# EMUSCOBJECTS:=$(addprefix $(EMUSCBUILDDIR)/,$(addsuffix .o,$(EMUSCFILES)))
# EMUSCINCLUDES:=$(addprefix $(EMUSCBUILDDIR)/include/emusc/,$(addsuffix .h,$(EMUSCFILES)))

# emusc: $(EMUSCBUILDDIR) $(EMUSCBUILDDIR)/include/emusc $(EMUSCINCLUDES) $(EMUSCBUILDDIR)/libemusc.a

# $(EMUSCBUILDDIR) $(EMUSCBUILDDIR)/include/emusc:
# 	@mkdir -p $@

# $(EMUSCBUILDDIR)/include/emusc/%.h: $(EMUSCHOME)/src/%.h
# 	cp $< $@

# $(EMUSCBUILDDIR)/%.o: $(EMUSCHOME)/src/%.cc
# 	$(PREFIX)-gcc $(CFLAGS_FOR_TARGET) -I $(EMUSCHOME)/src -c -o $@ $<

# $(EMUSCBUILDDIR)/libemusc.a: $(EMUSCOBJECTS)
# 	$(PREFIX)-ar rcs $@ $^

#
# Build kernel itself
#
all: circle-stdlib mt32emu fluidsynth emusc
	@$(MAKE) -f Kernel.mk $(KERNEL).img $(KERNEL).hex

#
# Clean kernel only
#
clean:
	@$(MAKE) -f Kernel.mk clean

#
# Clean kernel and all dependencies
#
veryclean: clean
# Reverse patches
	@${REVERSE_PATCH} $(CIRCLEHOME) patches/circle-45-zone-allocator.patch
	@${REVERSE_PATCH} $(CIRCLEHOME) patches/circle-45-cp210x-remove-partnum-check.patch
	@${REVERSE_PATCH} $(CIRCLEHOME) patches/circle-45-minimal-usb-drivers.patch
	@${REVERSE_PATCH} $(FLUIDSYNTHHOME) patches/fluidsynth-2.3.1-circle.patch

# Clean circle-stdlib
	@$(MAKE) -C $(CIRCLESTDLIBHOME) mrproper
	@$(RM) $(CIRCLESTDLIBHOME)/.done

# Clean mt32emu
	@$(RM) -r $(MT32EMUBUILDDIR)

# Clean FluidSynth
	@$(RM) -r $(FLUIDSYNTHBUILDDIR)
