# SPDX-License-Identifier: CC0-1.0
#
# SPDX-FileContributor: Antonio Niño Díaz, 2022

# User config
# ===========

# ROM config
# ----------

NAME		:= vi
GAME_TITLE	:= "VIOLET'S CV"
GAME_CODE	:= "00"

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

DEFINES		:=

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

LIBS		:= -lc
LIBDIRS		:= # A list of paths

# Include paths
# -------------

INCLUDES	:= # A list of paths

# Tools
# -----

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

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

# `make V=` builds the binary in verbose build mode
V		:= @

# Directories
# -----------

SOURCEDIR	:= source
BUILDDIR	:= build

# Build artfacts
# --------------

ELF		:= $(NAME).elf
DUMP		:= $(NAME).dump
ROM		:= $(NAME).gba
MAP		:= $(NAME).map

GBAFIX		:= gbafix/gbafix

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

SOURCES_S	:= $(wildcard $(SOURCEDIR)/*.s $(SOURCEDIR)/**/*.s)
SOURCES_C	:= $(wildcard $(SOURCEDIR)/*.c $(SOURCEDIR)/**/*.c)
SOURCES_CPP	:= $(wildcard $(SOURCEDIR)/*.cpp $(SOURCEDIR)/**/*.cpp)

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

DEFINES		+= -D__GBA__

ARCH		:= -mcpu=arm7tdmi -mtune=arm7tdmi

WARNFLAGS	:= -Wall

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

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

ASFLAGS		+= -x assembler-with-cpp $(DEFINES) $(ARCH) \
		   -mthumb -mthumb-interwork $(INCLUDEFLAGS) \
		   -ffunction-sections -fdata-sections -lm

CFLAGS		+= -std=gnu11 $(WARNFLAGS) $(DEFINES) $(ARCH) \
		   -mthumb -mthumb-interwork $(INCLUDEFLAGS) -O2 \
		   -ffunction-sections -fdata-sections -lm -g

CXXFLAGS	+= -std=gnu++14 $(WARNFLAGS) $(DEFINES) $(ARCH) \
		   -mthumb -mthumb-interwork $(INCLUDEFLAGS) -O2 \
		   -ffunction-sections -fdata-sections \
		   -fno-exceptions -fno-rtti

LDFLAGS		:= -mthumb -mthumb-interwork $(LIBDIRSFLAGS) \
		   -Wl,-Map,$(MAP) -Wl,--gc-sections \
		   -specs=nano.specs -T source/sys/gba_cart.ld \
		   -Wl,--start-group $(LIBS) -Wl,--end-group -lm

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

OBJS		:= \
	$(patsubst $(SOURCEDIR)/%.s,$(BUILDDIR)/%.s.o,$(SOURCES_S)) \
	$(patsubst $(SOURCEDIR)/%.c,$(BUILDDIR)/%.c.o,$(SOURCES_C)) \
	$(patsubst $(SOURCEDIR)/%.cpp,$(BUILDDIR)/%.cpp.o,$(SOURCES_CPP))

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

# Rules
# -----

$(BUILDDIR)/%.s.o : $(SOURCEDIR)/%.s
	@echo "  AS      $<"
	@$(MKDIR) -p $(@D) # Build target's directory if it doesn't exist
	$(V)$(CC) $(ASFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.c.o : $(SOURCEDIR)/%.c
	@echo "  CC      $<"
	@$(MKDIR) -p $(@D) # Build target's directory if it doesn't exist
	$(V)$(CC) $(CFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.cpp.o : $(SOURCEDIR)/%.cpp
	@echo "  CXX     $<"
	@$(MKDIR) -p $(@D) # Build target's directory if it doesn't exist
	$(V)$(CXX) $(CXXFLAGS) -MMD -MP -c -o $@ $<


# Targets
# -------

.PHONY: all clean dump

all: $(ROM)

$(GBAFIX):
	$(V)cd gbafix && make

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

$(ROM): $(ELF) $(GBAFIX)
	@echo "  OBJCOPY $<"
	$(V)$(OBJCOPY) -O binary $< $@
	@echo "  GBAFIX  $@"
	$(V)$(GBAFIX) $@ -t$(GAME_TITLE) -c$(GAME_CODE)

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

dump: $(DUMP)

clean:
	@echo "  CLEAN"
	$(V)$(RM) $(ROM) $(ELF) $(DUMP) $(MAP) $(BUILDDIR)
	$(V)cd gbafix && make clean

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

-include $(DEPS)