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

include $(DEVKITARM)/ds_rules

#---------------------------------------------------------------------------------
# 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
# all directories are relative to this makefile
#---------------------------------------------------------------------------------

ifeq ($(strip $(WORLD)),)
	WORLD := adrift
endif

BUILD    := build/$(WORLD)
SOURCES  := engine source generic zlib $(WORLD)
INCLUDES := include engine generic zlib $(WORLD)
DATA     :=
GRAPHICS := graphics

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH    := -mthumb -mthumb-interwork

CFLAGS  := -g -Wall -O2\
           -march=armv5te -mtune=arm946e-s -fomit-frame-pointer\
           -ffast-math \
           $(ARCH) \
           -DWORLD=$(WORLD)

CFLAGS   += $(INCLUDE) -DARM9
CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions

ASFLAGS := -g $(ARCH) -march=armv5te -mtune=arm946e-s

LDFLAGS = -specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS := -lfat -lnds9
 
#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS := $(LIBNDS)
 
#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifndef REALBUILD
#---------------------------------------------------------------------------------
 
export ARM9BIN := $(TOPDIR)/$(TARGET).arm9
export ARM9ELF := $(CURDIR)/$(TARGET).arm9.elf
export DEPSDIR := $(CURDIR)/$(BUILD)

export VPATH   := $(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
                  $(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir)) \
                  $(foreach dir,$(DATA),$(CURDIR)/$(dir))
 
CFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
PNGFILES := $(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.png)))
 
#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
	export LD := $(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
	export LD := $(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES := $(addsuffix .o,$(BINFILES)) \
                 $(PNGFILES:.png=.o) \
                 $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
 
export INCLUDE := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
                  $(foreach dir,$(LIBDIRS),-I$(dir)/include) \
                  -I$(CURDIR)/$(BUILD)
 
export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)

export ENTDIR := $(CURDIR)/$(WORLD)/entities
 
.PHONY: $(BUILD) clean entities
 
#---------------------------------------------------------------------------------
$(BUILD): entities
	@[ -d $@ ] || mkdir -p $@
	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile REALBUILD=1
 
#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) *.elf *.nds* *.bin 

entities: $(WORLD)/.entities-stamp
$(WORLD)/.entities-stamp: $(wildcard $(ENTDIR)/*.rb)
	ruby -I$(TOPDIR) $(TOPDIR)/genentities.rb $(CURDIR)/$(WORLD)/entities
	touch $(WORLD)/.entities-stamp

#---------------------------------------------------------------------------------
else
 
ENTFILES := $(notdir $(wildcard $(ENTDIR)/*.cpp))
OFILES += $(ENTFILES:.cpp=.entity.o)

DEPENDS := $(OFILES:.o=.d)
 
#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(ARM9BIN) : $(ARM9ELF)
	@$(OBJCOPY) -O binary $< $@
	@echo built ... $(notdir $@)
	@echo $(ENTFILES)

$(ARM9ELF) : $(OFILES)
	@echo linking $(notdir $@)
	@$(LD)  $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@

#---------------------------------------------------------------------------------
# you need a rule like this for each extension you use as binary data 
#---------------------------------------------------------------------------------
%.bin.o : %.bin
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@$(bin2o)

%.entity.o : entities/%.cpp
	@echo $(notdir $<)
	$(CXX) -MMD -MP -MF $(DEPSDIR)/$*.entity.d $(CXXFLAGS) -c $< -o $@

%.s %.h : %.png %.grit
	grit $< -fts -o$*

-include $(DEPENDS)
 
#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------