LIBGL  := -lGL -lGLU
LIBSDL := `sdl-config --libs`
LIBS   := ${LIBSDL} ${LIBGL}

OPTFLAGS := -O2
DBGFLAGS := -ggdb
PRFFLAGS := ${DBGFLAGS} -pg
MYFLAGS  := -Wall -pedantic -ansi
CXXFLAGS := ${MYFLAGS} ${DBGFLAGS}

VALFLAGS := --leak-check=full

CXX := g++

SRCS := # := start

DIRS := # := start
DIRS += .
DIRS += Entities
DIRS += GameStates
DIRS += Effects
DIRS += config
DIRS += input
DIRS += graphics

include $(addsuffix /files.mk,${DIRS})

OBJSDIR := ../objs/
OBJS    := ${SRCS:.cpp=.o}
OBJS    := $(addprefix ${OBJSDIR},${OBJS})

DEPSDIR := ../deps/
DEPS    := ${SRCS:.cpp=.d}
DEPS    := $(addprefix ${DEPSDIR},${DEPS})

WORKINGDIR  := ../bin/
TARGETNAME  := run_physics
TARGETTMP   := ${OBJSDIR}${TARGETNAME}
TARGET  		:= ${WORKINGDIR}${TARGETNAME}

BLDDIRS := $(addprefix ${DEPSDIR},${DIRS}) $(addprefix ${OBJSDIR},${DIRS}) ${WORKINGDIR}


VERBOSE := 0

ifeq (${VERBOSE},0)
    # quiet the echo command
    Q1 := @
    # quiet the command that is `replaced' by an echo
    Q2 := @
else
    # EAT the echo command as if it was not there
    Q1 := @true # NOTE: the space between @true and the # is VERY important!!
    # do not quiet the command output
    Q2 :=
endif

.PHONY: all
all: ${TARGET}

# rule to copy tmp target to working directory
${TARGET}: ${TARGETTMP}
	${Q1}echo "cp: $@"
	${Q2}cp $^ $@

# how to link the main target
${TARGETTMP}: ${OBJS}
	${Q1}echo "${CXX}: $@"
	${Q2}${CXX} ${CXXFLAGS} -o $@ $^ ${LIBS}

# how to make a directory
${BLDDIRS}:
	${Q2}mkdir -p $@

# rule to make a depend file from a .cpp
${DEPSDIR}%.d: %.cpp | ${BLDDIRS}
	${Q1}echo "DEP: $@"
	${Q2}${CXX} -MM ${CXXFLAGS} $< | sed 's,\(^.*\):,${OBJSDIR}\1 $@:,' > $@

# rule to make an object file from a .cpp
${OBJSDIR}%.o: %.cpp | ${BLDDIRS}
	${Q1}echo "${CXX}: $@"
	${Q2}${CXX} ${CXXFLAGS} -c -o $@ $<


tags: ${SRCS}
	${Q1}echo "ctags: $@"
	${Q2}ctags $^


.PHONY: clean
clean:
	${Q1}echo "CLEAN: OBJS"
	${Q2}rm -f ${OBJS}
	${Q1}echo "CLEAN: TARGET"
	${Q2}rm -f ${TARGET}

.PHONY: distclean
distclean: clean
	${Q1}echo "CLEAN: DEPS"
	${Q2}rm -f ${DEPS}
	${Q1}echo "CLEAN: tags prof gmon.out"
	${Q2}rm -f tags prof gmon.out

.PHONY: gitclean
gitclean:
	${Q1}echo "git-clean: show, use gitcleanf to force"
	${Q2}cd ..; git clean -nxd

.PHONY: gitcleanf
gitcleanf:
	${Q1}echo "git-clean: forced"
	${Q2}cd ..; git clean -fxd

.PHONY: tar
tar: ../physics.tar.bz2

.PHONY: ../physics.tar.bz2
../physics.tar.bz2:
	@echo "git-archive: Warning, archives HEAD not current"
	${Q1}echo "git-archive: ../physics.tar.bz2"
	${Q2}cd ..; git-archive --prefix=physics/ HEAD | bzip2 > physics.tar.bz2

.PHONY: run
run: all
	cd ${WORKINGDIR}; ./${TARGETNAME}

.PHONY: gdb
gdb: all
	cd ${WORKINGDIR}; gdb ${TARGETNAME}

.PHONY: cgdb
cgdb: all
	cd ${WORKINGDIR}; cgdb ${TARGETNAME}

.PHONY: val
val: all
	cd ${WORKINGDIR}; valgrind ${VALFLAGS} ./${TARGETNAME}

.PHONY: prof
prof: run
	cd ${WORKINGDIR}; gprof -b ${TARGETNAME} > src/prof
	kprof -f prof

MINGMAKEARGS := "LIBGL      := -lopengl32 -lglu32" \
                "LIBSDL     := `/usr/mingw32/bin/sdl-config --libs`" \
                "CXXFLAGS   := ${OPTFLAGS}" \
                "CXX        := mingw32-g++" \
                "OBJSDIR    := ../objs-mingw32/" \
                "WORKINGDIR := ../bin-mingw32" \
                "TARGETNAME := run_physics.exe"

.PHONY: mingw32
mingw32:
	${Q1}echo "make: mingw32"
	${Q2}${MAKE} ${MINGMAKEARGS} clean all

-include ${DEPS}