#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------

ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif

include $(DEVKITARM)/ds_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# INCLUDES is a list of directories containing extra header files
# DATA is a list of directories containing binary files embedded using bin2o
# GRAPHICS is a list of directories containing image files to be converted with grit
# AUDIO is a list of directories containing audio to be converted by maxmod
# ICON is the image used to create the game icon, leave blank to use default rule
# NITRO is a directory that will be accessible via NitroFS
#---------------------------------------------------------------------------------
TARGET   := $(shell basename $(CURDIR))
BUILD    := build
SOURCES  := source
INCLUDES := include
DATA     := data
GRAPHICS :=
AUDIO    :=
ICON     :=

# specify a directory which contains the nitro filesystem
# this is relative to the Makefile
NITRO    := nitrofiles

# These set the information text in the nds file
GAME_TITLE     := $(shell basename $(CURDIR))
GAME_SUBTITLE1 := Nitro Engine example
GAME_SUBTITLE2 := github.com/AntonioND/nitro-engine

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH := -marm -mthumb-interwork -march=armv5te -mtune=arm946e-s

CFLAGS   := -g -Wall -O3\
            $(ARCH) $(INCLUDE) -DARM9
CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions
ASFLAGS  := -g $(ARCH)
LDFLAGS   = -specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project (order is important)
#---------------------------------------------------------------------------------
LIBS := -lNE -lnflib

# automatigically add libraries for NitroFS
ifneq ($(strip $(NITRO)),)
LIBS := -lfilesystem -lfat $(LIBS)
endif
# automagically add maxmod library
ifneq ($(strip $(AUDIO)),)
LIBS := -lmm9 $(LIBS)
endif

LIBS := $(LIBS) -lnds9

#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS := $(LIBNDS) $(PORTLIBS) $(DEVKITPRO)/nitro-engine $(DEVKITPRO)/nflib

#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export OUTPUT := $(CURDIR)/$(TARGET)

export VPATH := $(CURDIR)/$(subst /,,$(dir $(ICON)))\
                $(foreach dir,$(SOURCES),$(CURDIR)/$(dir))\
                $(foreach dir,$(DATA),$(CURDIR)/$(dir))\
                $(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir))

export DEPSDIR := $(CURDIR)/$(BUILD)

CFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
PNGFILES := $(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.png)))
BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))

# prepare NitroFS directory
ifneq ($(strip $(NITRO)),)
  export NITRO_FILES := $(CURDIR)/$(NITRO)
endif

# get audio list for maxmod
ifneq ($(strip $(AUDIO)),)
  export MODFILES	:=	$(foreach dir,$(notdir $(wildcard $(AUDIO)/*.*)),$(CURDIR)/$(AUDIO)/$(dir))

  # place the soundbank file in NitroFS if using it
  ifneq ($(strip $(NITRO)),)
    export SOUNDBANK := $(NITRO_FILES)/soundbank.bin

  # otherwise, needs to be loaded from memory
  else
    export SOUNDBANK := soundbank.bin
    BINFILES += $(SOUNDBANK)
  endif
endif

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
  export LD := $(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
  export LD := $(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES_BIN   :=	$(addsuffix .o,$(BINFILES))

export OFILES_SOURCES := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)

export OFILES := $(PNGFILES:.png=.o) $(OFILES_BIN) $(OFILES_SOURCES)

export HFILES := $(PNGFILES:.png=.h) $(addsuffix .h,$(subst .,_,$(BINFILES)))

export INCLUDE  := $(foreach dir,$(INCLUDES),-iquote $(CURDIR)/$(dir))\
                   $(foreach dir,$(LIBDIRS),-I$(dir)/include)\
                   -I$(CURDIR)/$(BUILD)
export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)

ifeq ($(strip $(ICON)),)
  icons := $(wildcard *.bmp)

  ifneq (,$(findstring $(TARGET).bmp,$(icons)))
    export GAME_ICON := $(CURDIR)/$(TARGET).bmp
  else
    ifneq (,$(findstring icon.bmp,$(icons)))
      export GAME_ICON := $(CURDIR)/icon.bmp
    endif
  endif
else
  ifeq ($(suffix $(ICON)), .grf)
    export GAME_ICON := $(CURDIR)/$(ICON)
  else
    export GAME_ICON := $(CURDIR)/$(BUILD)/$(notdir $(basename $(ICON))).grf
  endif
endif

.PHONY: $(BUILD) clean

#---------------------------------------------------------------------------------
$(BUILD):
	@mkdir -p $@
	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile

#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) $(TARGET).elf $(TARGET).nds $(SOUNDBANK)

#---------------------------------------------------------------------------------
else

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(OUTPUT).nds: $(OUTPUT).elf $(GAME_ICON)
$(OUTPUT).elf: $(OFILES)

# source files depend on generated headers
$(OFILES_SOURCES) : $(HFILES)

# need to build soundbank first
$(OFILES): $(SOUNDBANK)

#---------------------------------------------------------------------------------
# rule to build solution from music files
#---------------------------------------------------------------------------------
$(SOUNDBANK) : $(MODFILES)
#---------------------------------------------------------------------------------
	mmutil $^ -d -o$@ -hsoundbank.h

#---------------------------------------------------------------------------------
%.bin.o %_bin.h : %.bin
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@$(bin2o)

#---------------------------------------------------------------------------------
# This rule creates assembly source files using grit
# grit takes an image file and a .grit describing how the file is to be processed
# add additional rules like this for each image extension
# you use in the graphics folders
#---------------------------------------------------------------------------------
%.s %.h: %.png %.grit
#---------------------------------------------------------------------------------
	grit $< -fts -o$*

#---------------------------------------------------------------------------------
# Convert non-GRF game icon to GRF if needed
#---------------------------------------------------------------------------------
$(GAME_ICON): $(notdir $(ICON))
#---------------------------------------------------------------------------------
	@echo convert $(notdir $<)
	@grit $< -g -gt -gB4 -gT FF00FF -m! -p -pe 16 -fh! -ftr

-include $(DEPSDIR)/*.d

#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------