# Last edited on 2011-05-07 08:19:20 by stolfi

SHELL := /bin/bash

#######################################################################
# Makefile to render a movie.
# Caller must define
#   ${OUT_DIR}   = output directory.
#   ${NAME}      = name of image to render minus "${OUT_DIR}/" and ".png".
#   ${WIDTH}     = width of image(s).
#   ${HEIGHT}    = height of image(s).
#   ${NRAYS}     = subsampling order (1,2,...).
#   ${NFRAMES}   = number of frames to render (required render-movie or render-strip).

# Optionally also:
#   ${SHOW}      = "YES" to display the movie after rendering.

ifneq "/${OUT_DIR}" "/"
ifneq "/${NAME}" "/"
ifneq "/${WIDTH}" "/"
ifneq "/${HEIGHT}" "/"
ifneq "/${NRAYS}" "/"
ifneq "/${NFRAMES}" "/"

.PHONY:: render-movie clean-movie
  
CLOCK_FORMAT := "%8.6f"
VIEW_MOVIE := iceweasel

CLOCKS := ${shell compute-movie-clocks.sh 0.0 1.0 ${NFRAMES} ${CLOCK_FORMAT}}

FRAME_PNGS := ${addprefix ${OUT_DIR}/${NAME}-,${addsuffix .png,${CLOCKS}}}

${OUT_DIR}: 
	mkdir -p ${OUT_DIR}

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# "make render-movie" creates a movie with ${NFRAMES} frames.

MOVIE_NAME := ${NAME}-mov
MOVIE_GIF := ${OUT_DIR}/${MOVIE_NAME}.gif

DELAY := ${shell echo '360.0/${NFRAMES}' | bc -lq}

render-movie: ${OUT_DIR} clean-movie ${MOVIE_GIF}

${MOVIE_GIF}:
	for clock in ${CLOCKS} ; do \
          ${MAKE} -f POVRAY-FRAME.make \
            NAME=${NAME} CLOCK=$$clock \
            WIDTH=${WIDTH} HEIGHT=${HEIGHT} NRAYS=${NRAYS} \
            SHOWOPT='-D' \
            render-frame ; \
        done
	./animate-movie-frames.sh \
           -delay ${DELAY} \
           ${MOVIE_GIF} \
           ${FRAME_PNGS}
	@-if [[ -s ${MOVIE_GIF} ]] ; then \
          if [[ "/${SHOW}" == "/YES" ]]; then ${VIEW_MOVIE} ${MOVIE_GIF} ; fi \
        fi

clean-movie:
	-/bin/rm -f ${OUT_DIR}/${NAME}.log ${OUT_DIR}/${NAME}-*.log
	-/bin/rm -f ${FRAME_PNGS}
	-/bin/rm -f ${MOVIE_GIF}

# End ${OUT_DIR}, ${NAME}, ${WIDTH}, ${HEIGHT}, ${NRAYS}, ${NFRAMES} section
######################################################################
endif
endif
endif
endif
endif
endif