configure.in

AC_INIT(ShaderVG, 1.0.0)
AC_CONFIG_HEADERS([config.h:config.h.in])
AM_INIT_AUTOMAKE([foreign])
AC_CANONICAL_HOST

AC_PROG_CC_C99
AC_PROG_LIBTOOL

# ==============================================
# Check examples selection

AC_ARG_WITH(
	[example-all],
	[  --with-example-all            Initialize build values for all examples (default=yes)],
	[build_test_all=$withval], [build_test_all="yes"])

AC_ARG_WITH(
	[example-vgu],
	[  --with-example-vgu            Build VGU example (default=yes)],
	[build_test_vgu=$withval], [build_test_vgu="$build_test_all"])

AC_ARG_WITH(
	[example-dash],
	[  --with-example-dash           Build Dashing example (default=yes)],
	[build_test_dash=$withval], [build_test_dash="$build_test_all"])

AC_ARG_WITH(
	[example-linear],
	[  --with-example-linear         Build Linear Gradient example (default=yes)],
	[build_test_linear=$withval], [build_test_linear="$build_test_all"])

AC_ARG_WITH(
	[example-radial],
	[  --with-example-radial         Build Radial Gradient example (default=yes)],
	[build_test_radial=$withval], [build_test_radial="$build_test_all"])

AC_ARG_WITH(
	[example-interpolate],
	[  --with-example-interpolate    Build Path Interpolation example (default=yes)],
	[build_test_interpolate=$withval], [build_test_interpolate="$build_test_all"])

AC_ARG_WITH(
	[example-tiger],
	[  --with-example-tiger          Build Tiger SVG example (default=yes)],
	[build_test_tiger=$withval], [build_test_tiger="$build_test_all"])

AC_ARG_WITH(
	[example-image],
	[  --with-example-image          Build Images example (default=yes)],
	[build_test_image=$withval], [build_test_image="$build_test_all"])

AC_ARG_WITH(
	[example-pattern],
	[  --with-example-pattern        Build Pattern Paint example (default=yes)],
	[build_test_pattern=$withval], [build_test_pattern="$build_test_all"])

AC_ARG_WITH(
	[example-blend],
	[  --with-example-blend          Build Blending example (default=yes)],
	[build_test_blend=$withval], [build_test_blend="$build_test_all"])

AC_ARG_WITH(
	[example-tiger-shader],
	[  --with-example-tiger-shader   Build tiger shader example (default=yes)],
	[build_test_tiger_shader=$withval], [build_test_tiger_shader="$build_test_all"])

# ==============================================
# Integer types

AC_TYPE_INT8_T
AC_TYPE_UINT8_T
AC_TYPE_INT16_T
AC_TYPE_UINT16_T
AC_TYPE_INT32_T
AC_TYPE_UINT32_T
AC_TYPE_INT64_T
AC_TYPE_UINT64_T
AC_CHECK_SIZEOF([void *])

# ==============================================
# Check for math library

AC_CHECK_LIB([m],[cos])

# ==============================================
# Platform-specific directories and flags

case "${host}" in
*darwin*)
	GL_DIR="OpenGL"
	GLUT_DIR="GLUT"
	GL_LIB="-framework OpenGL"
	GLUT_LIB="-framework GLUT"
	CONFIG_CFLAGS=""
	CONFIG_LDFLAGS="-framework OpenGL -framework GLUT"
	CONFIG_LDADD="" ;;
*mingw* | *cygwin*)
	GL_DIR="GL"
	GLUT_DIR="GL"
	GL_LIB="-lGL"
	GLUT_FLAGS="-lglut"
	CONFIG_CFLAGS=""
	CONFIG_LDFLAGS=""
	CONFIG_LDADD="-lglut -lGL" ;;
*)
	GL_DIR="GL"
	GLUT_DIR="GL"
	GL_LIB="-lGL"
	GLUT_LIB="-lglut"
	CONFIG_CFLAGS=""
	CONFIG_LDFLAGS=""
	CONFIG_LDADD="-lglut -lGL" ;;
	
esac

AC_SUBST([CONFIG_CFLAGS])
AC_SUBST([CONFIG_LDFLAGS])
AC_SUBST([CONFIG_LDADD])

# ==============================================
# Check for OpenGL and GLUT headers

AC_CHECK_HEADERS(
	[$GL_DIR/gl.h],
	[has_gl_h="yes"], [has_gl_h="no"])

AC_CHECK_HEADERS(
	[$GL_DIR/glu.h],
	[has_glu_h="yes"], [has_glu_h="no"])

AC_CHECK_HEADERS(
	[$GLUT_DIR/glut.h],
	[has_glut_h="yes"], [has_glut_h="no"])

case "${host}" in
*linux*)
	AC_CHECK_HEADERS(
		[$GL_DIR/glx.h],
		[has_glx_h]="yes", [has_glx_h]="no") ;;
esac

# ===============================================
# Check for OpenGL and GLUT libraries

LDFLAGS="$LDFLAGS $GL_LIB"

echo -n "checking for OpenGL library... "
AC_LINK_IFELSE([
	char glEnd();
	int main(void) {glEnd(); return 0;}],
	[has_gl="yes"] && [echo "yes"],
	[has_gl="no"] && [echo "no"])

case "${host}" in
*linux*)
	AC_CHECK_LIB(
		[GL], glXGetProcAddress,
		[has_glx="yes"], [has_glx="no"]) ;;
esac

LDFLAGS="$LDFLAGS $GLUT_LIB"

echo -n "checking for GLUT library... "
AC_LINK_IFELSE([
	char glutInit();
	int main(void) {glutInit(); return 0;}],
	[has_glut="yes"] && [echo "yes"],
	[has_glut="no"] && [echo "no"])

LDFLAGS=""

# ==============================================
# JPEG library required for VGImage example

CFLAGS="-I$prefix/include"
LDFLAGS="-ljpeg -L/usr/local/lib -L$prefix/lib"

AC_CHECK_HEADERS(
	[jpeglib.h],
	[has_jpeg_h="yes"], [has_jpeg_h="no"])

echo -n "checking for JPEG library... "
AC_LINK_IFELSE([
	#include <stdio.h>
	#include <stdlib.h>
	#include <jpeglib.h>
	int main(void) {jpeg_create_decompress(0); return 0;}],
	[has_jpeg="yes"] && echo "yes",
	[has_jpeg="no"] && echo "no")

if test "x$build_test_image" = "xyes"; then

	if test "x$has_jpeg_h" = "xno"; then
		build_test_image="no (jpeg library headers missing)"
	else
		if test "x$has_jpeg" = "xno"; then
			build_test_image="no (failed linking with jpeg library)"
		fi
	fi
fi

if test "x$build_test_pattern" = "xyes"; then

	if test "x$has_jpeg_h" = "xno"; then
		build_test_pattern="no (jpeg library headers missing)"
	else
		if test "x$has_jpeg" = "xno"; then
			build_test_pattern="no (failed linking with jpeg library)"
		fi
	fi
fi

CFLASGS=""
LDFLAGS=""

# ==============================================
# report failure on missing libraries

NO_GL_H_MSG="

	gl.h header missing! ShaderVG cannot be built without
	OpenGL headers.
"
NO_GL_MSG="

	Failed linking with GL library! ShaderVG cannot be built
	without OpenGL library.
"
NO_GLX_H_MSG="

	glx.h header missing! ShaderVG cannot be build without
	GLX headers.
"
NO_GLX_MSG="

	Failed linking with GLX library! ShaderVG cannot be built
	without GLX library.
"

if test "x$has_gl_h" = "xno"; then
	AC_MSG_FAILURE([$NO_GL_H_MSG])
fi

if test "x$has_gl" = "xno"; then
	AC_MSG_FAILURE([$NO_GL_MSG])
fi

case "${host}" in
*linux*)
	if test "x$has_glx_h" = "xno"; then
		AC_MSG_FAILURE([$NO_GLX_H_MSG])
	fi
	if test "x$has_glx" = "xno"; then
		AC_MSG_FAILURE([$NO_GLX_MSG])
	fi ;;
esac

# ========================================================
# Setup automake conditionals according to configuration

AM_CONDITIONAL([BUILD_EXAMPLES], [test "x$has_glut_h" = "xyes"])

AM_CONDITIONAL([BUILD_VGU],         [test "x$build_test_vgu" = "xyes"])
AM_CONDITIONAL([BUILD_DASH],        [test "x$build_test_dash" = "xyes"])
AM_CONDITIONAL([BUILD_LINEAR],      [test "x$build_test_linear" = "xyes"])
AM_CONDITIONAL([BUILD_RADIAL],      [test "x$build_test_radial" = "xyes"])
AM_CONDITIONAL([BUILD_INTERPOLATE], [test "x$build_test_interpolate" = "xyes"])
AM_CONDITIONAL([BUILD_TIGER],       [test "x$build_test_tiger" = "xyes"])
AM_CONDITIONAL([BUILD_IMAGE],       [test "x$build_test_image" = "xyes"])
AM_CONDITIONAL([BUILD_PATTERN],     [test "x$build_test_pattern" = "xyes"])
AM_CONDITIONAL([BUILD_BLEND],       [test "x$build_test_blend" = "xyes"])
AM_CONDITIONAL([BUILD_TIGER_SHADER],[test "x$build_test_tiger_shader" = "xyes"])

AC_OUTPUT([
Makefile
src/Makefile
examples/Makefile
])

# =============================================

#echo "GL headers present      $has_gl_h"
#echo "GLX headers present     $has_glx_h"
#echo "GLUT headers present    $has_glut_h"
#echo "JPEG headers present    $has_jpeg_h"
#echo ""
#echo "GL library present      $has_gl"
#echo "GLX library present     $has_glx"
#echo "GLUT library present    $has_glut"
#echo "JPEG library present    $has_jpeg"

EXAMPLES_LIST="
ShaderVG will be compiled with the following example programs
(run './configure --help' to see how to change selection) :

  VGU                       ${build_test_vgu}
  Dashing                   ${build_test_dash}
  Linear Gradient           ${build_test_linear}
  Radial Gradient           ${build_test_radial}
  Path Interpolation        ${build_test_interpolate}
  Tiger SVG                 ${build_test_tiger}
  Images                    ${build_test_image}
  Pattern paint             ${build_test_pattern}
  Blending                  ${build_test_blend}
  Tiger Shader              ${build_test_tiger_shader}
"

if test "x$has_glut_h" = "xno"; then
	echo "ShaderVG example programs will not be built because"
	echo "the GLUT headers are missing!"

else

	if test "x$has_glut" = "xno"; then
		echo "ShaderVG example programs will not be built because"
		echo "linking to GLUT library failed!"
	
	else

	  echo "$EXAMPLES_LIST"

	fi
fi

echo ""