#        Vulture's Makefile

ifdef BUILD

ifndef CC
	CC := gcc
endif

LD := ld

ifndef SDL_CFLAGS
	ifndef SDL_CONFIG
		OS := $(shell uname -s)
		ifeq ($(OS),FreeBSD)
			SDL_CONFIG := sdl11-config
		else
			SDL_CONFIG := sdl-config
		endif
	endif
	SDL_CFLAGS = $(shell $(SDL_CONFIG) --cflags)
endif

CFLAGS := $(BASECFLAGS) $(SDL_CFLAGS) -DUSE_SDL_SYSCALLS -g -O

ifeq ($(BUILD), nethack)
	BUILDDIR := build_n
	CFLAGS += -DVULTURESEYE
else
	BUILDDIR := build_s
	CFLAGS += -DVULTURESCLAW
endif

# build target
OUTPUT_OBJ := $(BUILDDIR)/vultures.o


NHDIR := ../$(BUILD)
NHSRC := $(NHDIR)/src
INCLUDE := -I $(NHDIR)/include/  -I . -I $(BUILDDIR)/

# list of sources. list of objects and dependency files are autogenerated from it
VSOURCES := $(wildcard *.c)
VOBJ := $(patsubst %.c,$(BUILDDIR)/%.o, $(VSOURCES)) $(BUILDDIR)/vultures_gametiles.o
VDEPS := $(subst .o,.d, $(VOBJ))

# add vultures_gametiles.c to sources; due to it's different path it would have caused problems before...
VSOURCES += $(BUILDDIR)/vultures_gametiles.c 

# objects and libs for tiletrans
TTOBJ := $(NHSRC)/monst.o $(NHSRC)/objects.o $(BUILDDIR)/util/tiletrans.o $(BUILDDIR)/util/tilespec.o
TTCFLAGS = -g -O2 -Wall $(SDL_CFLAGS) # tiletrans uses SDL_endian.h to become endian-safe
TTLIBS := -L/usr/local/lib -lpng -lm -lz
TILESRC := ./gamedata/graphics/tilesrc
TTOUTPUT := $(BUILDDIR)/vultures_gametiles.c $(BUILDDIR)/vultures_gametiles.h gamedata/graphics/gametiles.bin


# how to genereate dependency info
define gendeps
	@mkdir -p $(BUILDDIR)
	@set -e; rm -f $@; \
	 $(CC) -MM $(CFLAGS) $(INCLUDE) $< > $@.$$$$; \
	 sed 's,\($*\)\.o[ :]*,$(BUILDDIR)/\1.o $@ : ,g' < $@.$$$$ > $@; \
	 rm -f $@.$$$$
endef


.PHONY : all
all: $(OUTPUT_OBJ)
	@echo finished building the files for the vultures interface

$(OUTPUT_OBJ): $(VOBJ) gamedata/graphics/gametiles.bin
	@echo combining objects to $@
	@$(LD) -r $(VOBJ) -o $(OUTPUT_OBJ)
	
#pseudo dependency of vultures_gametiles.h on vultures_gametiles.c to unbreak parallel make
$(BUILDDIR)/vultures_gametiles.h: $(BUILDDIR)/vultures_gametiles.c

#create vultures_gametiles.c and vultures_gametiles.h
$(TTOUTPUT): $(BUILDDIR)/tiletrans $(TILESRC)/*.png
	@echo "running tiletrans:"
	@mkdir -p $(BUILDDIR)
	@$(BUILDDIR)/tiletrans ./gamedata/graphics/gametiles.bin $(TILESRC)/
	@mv vultures_gametiles.c $(BUILDDIR)/
	@mv vultures_gametiles.h $(BUILDDIR)/

# build tiletrans
$(BUILDDIR)/tiletrans: $(TTOBJ)
	@echo "building tiletrans"
	@$(CC) $(TTCFLAGS) $(TTLIBS) $(TTOBJ) -o $(BUILDDIR)/tiletrans
	
$(BUILDDIR)/util/%.o: util/%.c util/tiletrans.h GNUmakefile
	@mkdir -p $(BUILDDIR)/util
	@echo compiling $<
	@$(CC) $(TTCFLAGS) $(INCLUDE) -c $< -o $@


# including the dependency files will cause them to be built if they don't exist
-include $(VDEPS)

# additionally, all our objects depend on the Makefile:
$(VOBJ): GNUmakefile

# rules to generate the dependencies using the gendeps macro
$(BUILDDIR)/%.d: %.c
	$(gendeps)
$(BUILDDIR)/vultures_gametiles.d: $(BUILDDIR)/vultures_gametiles.c
	$(gendeps)

# this will cause all regular files to be built
# NOTE: this rule will match for ../nethack/src/monst.c -> ../nethack/src/monst.o
#       too, if necessary. Normally monst.o will already exist when we get here,
#       but it may be useful when testing tiletrans...
%.o $(BUILDDIR)/%.o: %.c
	@echo compiling $<
	@mkdir -p $(BUILDDIR)
	@$(CC) $(CFLAGS) $(INCLUDE) -c $< -o $@
	

else # BUILD not defined
.PHONY:all
all:
	@echo "you must invoke this makefile with BUILD=(nethack|slashem)"
	@echo "so that we can find our includes..."
	@echo "you may also give additional parameters such as CFLAGS= etc"
endif


.PHONY:
clean:
	rm -rf build_n/ build_s/ vultures_gametiles.h