# Makefile to compile and render RenderMan

# program to render from .rib, 
# add current directory to search path for shaders
RENDER  = SHADERS=.:@ $(DELIGHT)/bin/renderdl


# flags for compiling
CFLAGS = -I$(DELIGHT)/include  -g
LDFLAGS = -L$(DELIGHT)/lib -g
LDLIBS = -l3delight -lm

# files and intermediate files we create
# for those who are not familiar with make:
#  $(IMAGES) will be the list of images
#  $(IMAGES:.tif=.o) will be the list of images with each .tif changed to .o
#  (so square.o persp.o ...)
IMAGES = square.tif persp.tif sphere.tif cube.tif cube2.tif
OBJS  = $(IMAGES:.tif=.o)
PROGS  = $(IMAGES:.tif=.gen)
RIBS   = $(IMAGES:.tif=.rib)

# make dependency: dummy target "all" depends on all of the images
# so "make all" will make all images. Also, since this is the first
# target in the file, just "make" is the same as "make all"
all: $(IMAGES)

# rules for actually building -- ordered from final output to original
# .c for no particular reason other than that the first rule is the
# default

# any .tif image from the .rib with the same name
# in "pattern" rules like this, $@ is the target (e.g. square.tif)
# while $< is the thing it is built from (e.g. target.rib)
%.tif: %.rib
	$(RENDER) $<

# .rib from program
%.rib: %.gen
	./$<

# program from .o
%.gen: %.o
	$(CC) -o $@ $< $(LDFLAGS) $(LDLIBS)

# .o from .c 
%.o: %.c
	$(CC) -c $(CFLAGS) $<

# add to the list of file suffixes that make should automatically
# figure out (rather than having to explicitly say that square.rib
# can be built from square.gen, if it has a .o and it needs a .rib,
# it'll figure out that it can get there by building the .gen first)
.SUFFIXES: .tif .rib .gen

# don't automatically remove the rib files that were created as
# intermediate steps. Otherwise, if you're building the .tif from the
# .c, it tries to clean up all intermediate files that it created to
# get there. It WILL clean up the programs and object files, so if
# you want to work with those, you should explicitly make them ("make
# square.gen" to get square.gen, rather than "make square.tif" with
# square.gen created as an intermediate file)
.PRECIOUS: $(RIBS)

# these final rules delete generated files. The first leaves the rib
# and image files
clean:
	rm -f *~ *.o $(PROGS)

# this one removes everything clean does, plus the rib and image
# files -- basically anything we know how to rebuild
clobber: clean
	rm -f $(RIBS) $(IMAGES)