forked from mia/Aegisub
148 lines
4.9 KiB
Text
148 lines
4.9 KiB
Text
# -*- mode: autoconf -*-
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#
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# AX_CHECK_GL
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#
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# Check for an OpenGL implementation. If GL is found, the required compiler
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# and linker flags are included in the output variables "GL_CFLAGS" and
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# "GL_LIBS", respectively. If no usable GL implementation is found, "no_gl"
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# is set to "yes".
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#
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# If the header "GL/gl.h" is found, "HAVE_GL_GL_H" is defined. If the header
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# "OpenGL/gl.h" is found, HAVE_OPENGL_GL_H is defined. These preprocessor
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# definitions may not be mutually exclusive.
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#
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# version: 2.7
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# author: Braden McDaniel <braden@endoframe.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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#
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# As a special exception, the you may copy, distribute and modify the
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# configure scripts that are the output of Autoconf when processing
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# the Macro. You need not follow the terms of the GNU General Public
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# License when using or distributing such scripts.
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#
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AC_DEFUN([AX_CHECK_GL],
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[AC_REQUIRE([AC_CANONICAL_HOST])dnl
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AC_REQUIRE([AC_PATH_X])dnl
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AC_REQUIRE([AC_PROG_SED])dnl
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AC_LANG_PUSH([C])
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AX_LANG_COMPILER_MS
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#
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# Use x_includes and x_libraries if they have been set (presumably by
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# AC_PATH_X).
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#
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AS_IF([test X$no_x != Xyes -a -n "$x_includes"],
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[GL_CFLAGS="-I$x_includes $GL_CFLAGS"])
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AC_CHECK_HEADERS([windows.h])
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ax_save_CPPFLAGS=$CPPFLAGS
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CPPFLAGS="$GL_CFLAGS $CPPFLAGS"
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AC_CHECK_HEADERS([GL/gl.h OpenGL/gl.h], , , [
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# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
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# include <windows.h>
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# endif
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])
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CPPFLAGS=$ax_save_CPPFLAGS
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m4_define([AX_CHECK_GL_PROGRAM],
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[AC_LANG_PROGRAM([[
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# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
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# include <windows.h>
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# endif
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# ifdef HAVE_GL_GL_H
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# include <GL/gl.h>
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# elif defined(HAVE_OPENGL_GL_H)
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# include <OpenGL/gl.h>
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# else
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# error no gl.h
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# endif]],
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[[glBegin(0)]])])
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m4_define([AX_CHECK_GL_GLX_PROGRAM],
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[AC_LANG_PROGRAM([[
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# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
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# include <windows.h>
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# endif
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# ifdef HAVE_GL_GL_H
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# include <GL/gl.h>
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# elif defined(HAVE_OPENGL_GL_H)
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# include <OpenGL/gl.h>
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# else
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# error no gl.h
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# endif]],
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[[glXQueryVersion(0, 0, 0)]])])
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AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
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[ax_cv_check_gl_libgl=no
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case $host_cpu in
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x86_64) ax_check_gl_libdir=lib64 ;;
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*) ax_check_gl_libdir=lib ;;
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esac
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ax_save_CPPFLAGS=$CPPFLAGS
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CPPFLAGS="$CPPFLAGS $GL_CFLAGS"
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ax_save_LDFLAGS=$LDFLAGS
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AS_IF([test X$no_x != Xyes -a -n "$x_libraries"],
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[LDFLAGS="$LDFLAGS -L$x_libraries"])
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ax_save_LIBS=$LIBS
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ax_check_libs="-lopengl32 -lGL"
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for ax_lib in $ax_check_libs; do
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AS_IF([test X$ax_compiler_ms = Xyes],
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[ax_try_lib=`echo $ax_lib | $SED -e 's/^-l//' -e 's/$/.lib/'`],
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[ax_try_lib=$ax_lib])
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LDFLAGS="$ax_save_LDFLAGS $GL_LIBS"
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LIBS="$ax_try_lib $ax_save_LIBS"
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AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
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[ax_cv_check_gl_libgl=$ax_try_lib; break],
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[ax_check_gl_dylib_flag='-dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib'
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LDFLAGS="$ax_save_LDFLAGS $GL_LIBS $ax_check_gl_dylib_flag"
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AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
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[ax_cv_check_gl_libgl="$ax_check_gl_dylib_flag $ax_try_lib"; break])])
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done
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#
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# If no_x is "yes", we don't want to wind up using a libGL that is
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# linked with X11. Test to see if the found libGL includes GLX
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# functions. If it does and no_x is "yes", we want to reset
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# ax_cv_check_gl_libgl back to "no".
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#
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# Note that LDFLAGS and LIBS should still have whatever values they
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# had when we broke out of the test loop above; use that.
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#
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AS_IF([test "X$ax_cv_check_gl_libgl" != Xno],
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[AC_LINK_IFELSE([AX_CHECK_GL_GLX_PROGRAM],
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[AS_IF([test X$no_x = Xyes],
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[ax_cv_check_gl_libgl=no])])])
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LIBS=$ax_save_LIBS
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AS_IF([test "X$ax_cv_check_gl_libgl" = Xno],
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[LDFLAGS="$ax_save_LDFLAGS -framework OpenGL"
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AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
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[ax_cv_check_gl_libgl='-framework OpenGL'])])
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LDFLAGS=$ax_save_LDFLAGS
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CPPFLAGS=$ax_save_CPPFLAGS])
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AS_IF([test "X$ax_cv_check_gl_libgl" = Xno],
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[no_gl=yes; GL_CFLAGS=""; GL_LIBS=""],
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[GL_LIBS="$ax_cv_check_gl_libgl $GL_LIBS"])
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AC_LANG_POP([C])
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AC_SUBST([GL_CFLAGS])
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AC_SUBST([GL_LIBS])
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])dnl
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