autoconf: Configure the osmesa channel size for OSMesa16 and OSMesa32
Allow the user to specify channel bits of 16 or 32 to enable OSMesa16 or
OSMesa32 instead of the default OSMesa. This option is controlled
through the option --with-osmesa-bits=BITS and is only honored when the
driver is osmesa.
The osdemos are not enabled in the 16 or 32 bit case because the
Makefile is currently hardcoded to link to -lOSMesa.
diff --git a/configure.ac b/configure.ac
index 9272b01..db6a785 100644
--- a/configure.ac
+++ b/configure.ac
@@ -328,6 +328,30 @@
fi
fi
+dnl Configure the channel bits for OSMesa (libOSMesa, libOSMesa16, ...)
+AC_ARG_WITH(osmesa-bits,
+ [AS_HELP_STRING([--with-osmesa-bits=BITS],
+ [OSMesa channel bits and library name: 8, 16, 32 @<:@default=8@:>@])],
+ osmesa_bits="$withval",
+ osmesa_bits=8)
+if test "$mesa_driver" != osmesa && test "x$osmesa_bits" != x8; then
+ AC_MSG_WARN([Ignoring OSMesa channel bits for non-OSMesa driver])
+ osmesa_bits=8
+fi
+case "x$osmesa_bits" in
+x8)
+ OSMESA_LIB=OSMesa
+ ;;
+x16|x32)
+ OSMESA_LIB="OSMesa$osmesa_bits"
+ DEFINES="$DEFINES -DCHAN_BITS=$osmesa_bits -DDEFAULT_SOFTWARE_DEPTH_BITS=31"
+ ;;
+*)
+ AC_MSG_ERROR([OSMesa bits '$osmesa_bits' is not a valid option])
+ ;;
+esac
+AC_SUBST(OSMESA_LIB)
+
case "$mesa_driver" in
osmesa)
OSMESA_LIB_DEPS="-lm -lpthread"
@@ -355,8 +379,11 @@
case "$mesa_driver" in
osmesa)
- # If GLU is available, we can build the osdemos
- PROGRAM_DIRS="$PROGRAM_DIRS osdemos"
+ # If GLU is available and we have libOSMesa (not 16 or 32),
+ # we can build the osdemos
+ if test "$osmesa_bits" = 8; then
+ PROGRAM_DIRS="$PROGRAM_DIRS osdemos"
+ fi
# Link libGLU to libOSMesa instead of libGL
GLU_LIB_DEPS=""