# SPDX-License-Identifier: CC0-1.0
#
# SPDX-FileContributor: Antonio Niño Díaz, 2023

export BLOCKSDS			?= /opt/blocksds/core
export BLOCKSDSEXT		?= /opt/blocksds/external

export LIBTWL           ?= $(shell pwd)/libs/libtwl

export WONDERFUL_TOOLCHAIN	?= /opt/wonderful
ARM_NONE_EABI_PATH	?= $(WONDERFUL_TOOLCHAIN)/toolchain/gcc-arm-none-eabi/bin/

# Source code paths
# -----------------

SOURCEDIRS	:= arm9/source common
INCLUDEDIRS	:= arm9/source common
GFXDIRS		:= arm9/gfx
BINDIRS		:= arm9/data
AUDIODIRS	:=

# Defines passed to all files
# ---------------------------

DEFINES		:= -DLIBTWL_ARM9

# Libraries
# ---------

LIBS		:= -ltwl9 -lnds9
LIBDIRS		:= $(BLOCKSDS)/libs/libnds \
                $(LIBTWL)/libtwl9 $(LIBTWL)/common $(LIBTWL)

# Build artifacts
# ---------------

NAME		:= arm9
BUILDDIR	:= build/$(NAME)
ELF		:= build/$(NAME).elf
DUMP		:= build/$(NAME).dump
MAP		:= build/$(NAME).map
SOUNDBANKDIR	:= $(BUILDDIR)/maxmod

# Tools
# -----

PREFIX		:= $(ARM_NONE_EABI_PATH)arm-none-eabi-
CC		:= $(PREFIX)gcc
CXX		:= $(PREFIX)g++
LD		:= $(PREFIX)gcc
OBJDUMP		:= $(PREFIX)objdump
MKDIR		:= mkdir
RM		:= rm -rf

# Verbose flag
# ------------

ifeq ($(VERBOSE),1)
V		:=
else
V		:= @
endif

# Source files
# ------------

ifneq ($(BINDIRS),)
    SOURCES_BIN	:= $(shell find -L $(BINDIRS) -name "*.bin")
    SOURCES_NFT2 := $(shell find -L $(BINDIRS) -name "*.nft2")
    INCLUDEDIRS	+= $(addprefix $(BUILDDIR)/,$(BINDIRS))
endif
ifneq ($(GFXDIRS),)
    SOURCES_PNG	:= $(shell find -L $(GFXDIRS) -name "*.png")
    INCLUDEDIRS	+= $(addprefix $(BUILDDIR)/,$(GFXDIRS))
endif
ifneq ($(AUDIODIRS),)
    SOURCES_AUDIO	:= $(shell find -L $(AUDIODIRS) -regex '.*\.\(it\|mod\|s3m\|wav\|xm\)')
    ifneq ($(SOURCES_AUDIO),)
        INCLUDEDIRS	+= $(SOUNDBANKDIR)
    endif
endif

SOURCES_S	:= $(shell find -L $(SOURCEDIRS) -name "*.s")
SOURCES_C	:= $(shell find -L $(SOURCEDIRS) -name "*.c")
SOURCES_CPP	:= $(shell find -L $(SOURCEDIRS) -name "*.cpp")

# Compiler and linker flags
# -------------------------

ARCH		:= -marm -mthumb-interwork -mcpu=arm946e-s+nofp

SPECS		:= $(BLOCKSDS)/sys/crts/ds_arm9.specs

WARNFLAGS	:= -Wall

ifeq ($(SOURCES_CPP),)
	LIBS	+= -lc
else
	LIBS	+= -lstdc++ -lc
endif

INCLUDEFLAGS	:= $(foreach path,$(INCLUDEDIRS),-I$(path)) \
		   $(foreach path,$(LIBDIRS),-I$(path)/include)

LIBDIRSFLAGS	:= $(foreach path,$(LIBDIRS),-L$(path)/lib)

ASFLAGS		+= -x assembler-with-cpp $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -ffunction-sections -fdata-sections \
		   -specs=$(SPECS)

CFLAGS		+= -std=gnu17 $(WARNFLAGS) $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -O2 -ffunction-sections -fdata-sections \
		   -fno-devirtualize-speculatively \
		   -Werror=return-type \
		   -specs=$(SPECS)

CXXFLAGS	+= -std=gnu++23 $(WARNFLAGS) $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -O2 -ffunction-sections -fdata-sections \
		   -fno-exceptions -fno-rtti \
		   -fno-devirtualize-speculatively \
		   -Werror=return-type \
           -fno-threadsafe-statics \
           -Wno-volatile -Wsuggest-override -Werror=suggest-override \
		   -specs=$(SPECS)

LDFLAGS		:= $(ARCH) $(LIBDIRSFLAGS) -Wl,-Map,$(MAP),--gc-sections,--use-blx $(DEFINES) \
		   -Wl,--start-group $(LIBS) -Wl,--end-group -specs=$(SPECS)

# Intermediate build files
# ------------------------

OBJS_ASSETS	:= $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_BIN))) \
           $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_NFT2))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_PNG)))

HEADERS_ASSETS	:= $(patsubst %.bin,%_bin.h,$(addprefix $(BUILDDIR)/,$(SOURCES_BIN))) \
           $(patsubst %.nft2,%_nft2.h,$(addprefix $(BUILDDIR)/,$(SOURCES_NFT2))) \
		   $(patsubst %.png,%.h,$(addprefix $(BUILDDIR)/,$(SOURCES_PNG)))

ifneq ($(SOURCES_AUDIO),)
    OBJS_ASSETS		+= $(SOUNDBANKDIR)/soundbank.c.o
    HEADERS_ASSETS	+= $(SOUNDBANKDIR)/soundbank.h
endif

OBJS_SOURCES	:= $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_S))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_C))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_CPP)))

OBJS		:= $(OBJS_ASSETS) $(OBJS_SOURCES)

DEPS		:= $(OBJS:.o=.d)

# Targets
# -------

.PHONY: all clean dump

all: $(ELF)

$(ELF): $(OBJS)
	@echo "  LD.9    $@"
	$(V)$(LD) -o $@ $(OBJS) $(LDFLAGS)

$(DUMP): $(ELF)
	@echo "  OBJDUMP.9 $@"
	$(V)$(OBJDUMP) -h -C -S $< > $@

dump: $(DUMP)

clean:
	@echo "  CLEAN.9"
	$(V)$(RM) $(ELF) $(DUMP) $(MAP) $(BUILDDIR)

# Rules
# -----

$(BUILDDIR)/%.s.o : %.s
	@echo "  AS.9    $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CC) $(ASFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.c.o : %.c
	@echo "  CC.9    $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.arm.c.o : %.arm.c
	@echo "  CC.9    $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -marm -mlong-calls -c -o $@ $<

$(BUILDDIR)/%.cpp.o : %.cpp
	@echo "  CXX.9   $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CXX) $(CXXFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.arm.cpp.o : %.arm.cpp
	@echo "  CXX.9   $<"
	@$(MKDIR) -p $(@D)
	$(V)$(CXX) $(CXXFLAGS) -MMD -MP -marm -mlong-calls -c -o $@ $<

$(BUILDDIR)/%.bin.o $(BUILDDIR)/%_bin.h : %.bin
	@echo "  BIN2C.9 $<"
	@$(MKDIR) -p $(@D)
	$(V)$(BLOCKSDS)/tools/bin2c/bin2c $< $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $(BUILDDIR)/$*.bin.o $(BUILDDIR)/$*_bin.c

$(BUILDDIR)/%.nft2.o $(BUILDDIR)/%_nft2.h : %.nft2
	@echo "  BIN2C.9 $<"
	@$(MKDIR) -p $(@D)
	$(V)$(BLOCKSDS)/tools/bin2c/bin2c $< $(@D)
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $(BUILDDIR)/$*.nft2.o $(BUILDDIR)/$*_nft2.c

$(BUILDDIR)/%.png.o $(BUILDDIR)/%.h : %.png %.grit
	@echo "  GRIT.9  $<"
	@$(MKDIR) -p $(@D)
	$(V)$(BLOCKSDS)/tools/grit/grit $< -ftc -W1 -o$(BUILDDIR)/$*
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $(BUILDDIR)/$*.png.o $(BUILDDIR)/$*.c
	$(V)touch $(BUILDDIR)/$*.png.o $(BUILDDIR)/$*.h

$(SOUNDBANKDIR)/soundbank.h: $(SOURCES_AUDIO)
	@echo "  MMUTIL  $^"
	@$(MKDIR) -p $(@D)
	@$(BLOCKSDS)/tools/mmutil/mmutil $^ -d \
		-o$(SOUNDBANKDIR)/soundbank.bin -h$(SOUNDBANKDIR)/soundbank.h

$(SOUNDBANKDIR)/soundbank.c.o: $(SOUNDBANKDIR)/soundbank.h
	@echo "  BIN2C   soundbank.bin"
	$(V)$(BLOCKSDS)/tools/bin2c/bin2c $(SOUNDBANKDIR)/soundbank.bin \
		$(SOUNDBANKDIR)
	@echo "  CC.9    soundbank_bin.c"
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $(SOUNDBANKDIR)/soundbank.c.o \
		$(SOUNDBANKDIR)/soundbank_bin.c

# All assets must be built before the source code
# -----------------------------------------------

$(SOURCES_S) $(SOURCES_C) $(SOURCES_CPP): $(HEADERS_ASSETS)

# Include dependency files if they exist
# --------------------------------------

-include $(DEPS)