# created on 4/12/2006 by James Bentler
CXX ?= g++
CC ?= gcc
CFLAGS ?= -Wall -Wno-unused -O2 -fomit-frame-pointer
CFLAGS += -DHAVE_FILELENGTH -D__forceinline=inline -Izlib -IFLAC `sdl-config --cflags`
CFLAGS += -Dstricmp=strcasecmp -Dstrnicmp=strncasecmp -DNEED_STRUPR
LDFLAGS += -lFLAC++ -lFLAC -lz -lfmod `sdl-config --libs`

NASM ?= nasm
NASMFLAGS += -f elf -DM_TARGET_LINUX

SRCDIRS = src/ $(addprefix src/,g_doom/ g_heretic/ g_hexen/ g_raven/ g_shared/ g_strife/ oplsynth/ sound/ sdl/)
INCLUDES = $(addprefix -I,$(SRCDIRS))
CFLAGS += $(INCLUDES)

RELEASEOBJ ?= releaseobj
DEBUGOBJ ?= debugobj

CPPSRCS = $(wildcard $(addsuffix *.cpp,$(SRCDIRS)))
CSRCS = $(wildcard $(addsuffix *.c,$(SRCDIRS)))
ifndef NOASM
  ASRCS = $(wildcard src/*.nas)
  CFLAGS += -DUSEASM=1
else
  CFLAGS += -DNOASM
endif
SRCS = $(CSRCS) $(CPPSRCS) $(ASRCS)
CPPOBJFILES = $(notdir $(patsubst %.cpp,%.o,$(CPPSRCS)))
COBJFILES = $(notdir $(patsubst %.c,%.o,$(CSRCS)))
AOBJFILES = $(notdir $(patsubst %.nas,%.o,$(ASRCS)))

ZDOOM = zdoom
ZDOOMDEBUG = zdoomd

ifndef DEBUG
  OBJDIR = $(RELEASEOBJ)
  CFLAGS += -DNDEBUG
  LDFLAGS += -Wl,-Map=$(ZDOOM).map
  ZDOOMBIN = $(ZDOOM)
else
  OBJDIR = $(DEBUGOBJ)
  CFLAGS += -D_DEBUG -g3
  ZDOOMBIN = $(ZDOOMDEBUG)
endif
CXXFLAGS += $(CFLAGS)

COBJS = $(addprefix $(OBJDIR)/,$(CPPOBJFILES) $(COBJFILES))
DEPS = $(patsubst %.o,%.d,$(COBJS))
OBJS = $(addprefix $(OBJDIR)/,$(AOBJFILES)) $(COBJS)

# controls whether to start another instance of make at deps
RESTART?=1

# rule pattern for dependencies
define DEPBUILD_PATTERN
_dep_: _src_
	$(CXX) _src_ -MM $(CXXFLAGS) -MT "$$(patsubst %.d,%.o,_dep_) _dep_" -MF _dep_
endef

# rule pattern for assembly files
define ASMBUILD_PATTERN
_obj_: _src_
	$(NASM) -o _obj_ $(NASMFLAGS) _src_
endef

define CBUILD_PATTERN
_obj_: _src_
	$(CC) -c $(CFLAGS) -o _obj_ -c _src_
endef

all: $(ZDOOMBIN) zdoom.wad

$(ZDOOMBIN): $(OBJDIR) $(if $(RESTART),deps) $(OBJS)
ifndef RESTART
	$(CXX) $(LDFLAGS) $(OBJDIR)/autostart.o \
	$(filter-out %/autostart.o %/autozend.o,$(OBJS)) \
	$(OBJDIR)/autozend.o -o $(ZDOOMBIN)
endif

# include any of the dep files that already exist
$(foreach dep,$(DEPS),$(if $(wildcard $(dep)),$(eval include $(dep))))

# textually substitute in the _dep_ and the _src_ it depends on to create rules
# for creating dependency files without any existing dependency files
$(foreach src,$(CPPSRCS) $(CSRCS), $(eval $(subst _src_,$(src),$(subst \
_dep_,$(OBJDIR)/$(patsubst %.c,%.d,$(patsubst %.cpp,%.d,$(notdir $$$(src)))),\
$(DEPBUILD_PATTERN)))))

# textually substitute in the _obj_ and the _src_ it depends on to create rules
$(foreach src,$(ASRCS), $(eval $(subst _src_,$(src),$(subst \
_obj_,$(OBJDIR)/$(patsubst %.nas,%.o,$(notdir $$$(src))),$(ASMBUILD_PATTERN)))))

# textually substitute in the _obj_ and the _src_ it depends on to create rules
$(foreach src,$(CSRCS), $(eval $(subst _src_,$(src),$(subst \
_obj_,$(OBJDIR)/$(patsubst %.c,%.o,$(notdir $$$(src))),$(CBUILD_PATTERN)))))

$(OBJDIR)/%.o:
	$(CXX) -c $(CXXFLAGS) -o $@ -c $<

# start a new instance of make after dependency files have been made
deps: $(DEPS)
ifdef RESTART
	@make -f $(firstword $(MAKEFILE_LIST)) RESTART=
endif

$(OBJDIR):
	mkdir $(OBJDIR)

zdoom.wad:
	make -C wadsrc/ -f Makefile

.PHONY : clean cleandeps cleanobjs distclean deps

clean: cleanobjs
	rm -f $(ZDOOMDEBUG) $(ZDOOM) $(ZDOOM).map

# I could use a recursive delete instead, but that could be dangerous...
distclean: clean cleandeps
	rmdir $(RELEASEOBJ) $(DEBUGOBJ)

cleandeps:
	rm -f $(RELEASEOBJ)/*.d $(DEBUGOBJ)/*.d

cleanobjs:
	rm -f $(RELEASEOBJ)/*.o $(DEBUGOBJ)/*.o