#!/bin/bash
# this script by Mathieu Bouchard, 2001.

JMAX_VERSION=unknown

echo
if [ ! -f configure ]
then
	echo "Run me from the right directory please."
	exit 1
fi

argc=$#
while [ 0 != $# ]
do
	case $1 in
		--jmax24)
			JMAX_VERSION=24
			echo "Using jMax 2.4.x"
			JMAX_INCLUDE='"fts.h"'
		;;
		--jmax25)
			JMAX_VERSION=25
			echo "Using jMax 2.5.x"
			JMAX_INCLUDE='<fts/fts.h>'
		;;
		--jmax30)
			JMAX_VERSION=30
			echo "Using jMax 3.0.x (bêta)"
		;;
		--nojmax)
			JMAX_VERSION=none
			echo "Not using jMax"
		;;
		--no-mpeg)
			NO_MPEG=yes
			echo "won't check for libmpeg"
		;;
		--fast)
			echo "Fast Mode (less error checking)"
			OPTIONS="$OPTIONS HAVE_SPEED"
		;;
		--jmax-dist-dir)
			JMAXROOTDIR=$2
			shift
		;;
		*)
			echo "unknown option \`$1'"
			exit 1
		;;
	esac
	shift
done

if [ "z$JMAX_VERSION" = "zunknown" ]
then
	echo "usage: ./configure [--jmax24|--jmax25|--jmax30|--nojmax]"
	echo "         [--fast] [--jmax-dist-dir directory]"
	exit 1
fi

if [ ! "z$JMAX_VERSION" = "znone" ]; then
	if [ "z$JMAXROOTDIR" == "z" ]; then
		JMAXROOTDIR=`(cd ../..; echo $PWD)`
		if [ -d $JMAXROOTDIR/Makefiles ]; then
			echo "assuming --jmax-dist-dir $JMAXROOTDIR"
		else
			echo "please specify --jmax-dist-dir <pathname>"
			exit 1
		fi
	fi
fi

#--------------------------------#

has-libmpeg () {
	if [ ! "z$NO_MPEG" = "z" ]; then return 1; fi
(
	echo '#include <mpeg.h>'
	echo 'int main (void) { return GetMPEGFrame==0; }'
) > /tmp/$$.c
gcc /tmp/$$.c -o /tmp/$$ -lmpeg
}

has-videodev () {
(
	echo '#include <stdlib.h>'
	echo '#include <linux/videodev.h>'
	echo 'int main (void) { struct video_window foo; }' 
) > /tmp/$$.c
gcc /tmp/$$.c -o /tmp/$$
}

has-x11-shared-memory () {
(
	echo '#include <X11/Xlib.h>'
	echo '#include <X11/Xutil.h>'
	echo '#include <X11/StringDefs.h>'
	echo '#include <sys/ipc.h>'
	echo '#include <sys/shm.h>'
	echo '#include <X11/extensions/XShm.h>'
	echo 'int main (void) {return 0;}'
) > /tmp/$$.c
gcc /tmp/$$.c -o /tmp/$$ -L/usr/X11R6/lib -lX11
}

# this is very "heuristic" to say the least. sorry.
has-pentium-compatible () {
(
	echo 'typedef unsigned long long uint64;'
	echo 'int main(void) { uint64 x;'
	echo '__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));'
	echo 'return 0;}'
) > /tmp/$$.c
gcc /tmp/$$.c -o /tmp/$$ -mpentium && /tmp/$$
}

#--------------------------------#

FORMATS='X11 PPM Targa Grid'
LDSOFLAGS='-lm -L/usr/X11R6/lib -lX11 -lXext'

echo -n "looking for LibMPEG: "
if has-libmpeg; then
	echo "yes"
	FORMATS="$FORMATS MPEG"
	LDSOFLAGS="$LDSOFLAGS -lmpeg"
else
	echo "no"
fi

echo -n "looking for videodev (video4linux 1.x video digitizer drivers): "
if has-videodev; then
	echo "yes"
	FORMATS="$FORMATS VideoDev"
else
	echo "no"
fi

echo -n "looking for x11 shared memory (acceleration): "
if has-x11-shared-memory; then
	echo "yes"
	OPTIONS="$OPTIONS HAVE_X11_SHARED_MEMORY"
else
	echo "no"
fi

echo -n "looking for pentium-compatible CPU: "
if has-pentium-compatible; then
	echo "yes"
	OPTIONS="$OPTIONS HAVE_PENTIUM"
	OPTIONS="$OPTIONS HAVE_TSC_PROFILING"
else
	echo "no"
fi

#--------------------------------#

echo
echo "our format list: $FORMATS"
echo
echo "our option list: $OPTIONS"
echo

#--------------------------------#
echo "generating ./config.make"
(
	echo ifndef ARCH
	echo ARCH=i686-linux
	echo endif
	echo JMAX_VERSION=$JMAX_VERSION
	echo PNAME=gridflow
	if [ ! "z$JMAX_VERSION" = "znone" ]; then
		echo JMAXROOTDIR=$JMAXROOTDIR
		echo JMAXDISTDIR=$JMAXROOTDIR
		echo 'include $(JMAXDISTDIR)/Makefiles/Makefile.$(ARCH)'
	fi
	if [ "z$LDSOFLAGS" != "z" ]; then
		echo "GRIDFLOW_LDSOFLAGS += $LDSOFLAGS"
	fi
) > config.make

#--------------------------------#
echo "generating c/src/Sources"
(
	echo "SOURCES = \\"
	echo "lang.c dim.c bitpacking.c operator.c grid.c main.c \\"
	echo "grid_basic.c grid_extra.c io.c \\"
	for format in $FORMATS; do
		lc_format=`echo $format | tr A-Z a-z`
		echo "format_$lc_format.c \\"
	done
	echo ""
) > c/src/Sources

#--------------------------------#
echo "generating c/src/config.h"
(
echo "
#ifndef __CONFIG_H
#define __CONFIG_H
/* this file was auto-generated by gridflow/configure */

#ifdef STANDALONE
#include \"nofts.h\"
#else
#include $JMAX_INCLUDE
#endif

#define FORMAT_LIST(_pre1_,_pre2_) \\"
for format in $FORMATS; do
	echo "  _pre1_ _pre2_##Format$format,\\"
done
echo "_pre1_ _pre2_##FormatX11" # twice... hack.
echo
for z in $OPTIONS; do
	echo "#define $z"
done
echo
echo "#endif"
) > c/src/config.h