glx: make xf86vidmode mandatory for direct rendering

Currently we detect the module and if missing, the glXGetMsc* API is
effectively a stub, always returning false.

This is what effectively has been happening with our meson build :-(

Thus users have no chance of using it - they cannot even distinguish
if the failure is due to a misconfigured build.

There's no reason for keeping xf86vidmode optional - it has been
available in all distributions for years.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Fixes: a47c525f32 "meson: build glx"

configure.ac

         fi
     fi
 
-    # add xf86vidmode if available
-    PKG_CHECK_MODULES([XF86VIDMODE], [xxf86vm], HAVE_XF86VIDMODE=yes, HAVE_XF86VIDMODE=no)
-    if test "$HAVE_XF86VIDMODE" = yes ; then
-        dri_modules="$dri_modules xxf86vm"
-    fi
+    dri_modules="$dri_modules xxf86vm"
 
     PKG_CHECK_MODULES([DRIGL], [$dri_modules])
     GL_PC_REQ_PRIV="$GL_PC_REQ_PRIV $dri_modules"
     ;;
 esac
 
-# This is outside the case (above) so that it is invoked even for non-GLX
-# builds.
-AM_CONDITIONAL(HAVE_XF86VIDMODE, test "x$HAVE_XF86VIDMODE" = xyes)
-
 GLESv1_CM_LIB_DEPS="$LIBDRM_LIBS -lm $PTHREAD_LIBS $DLOPEN_LIBS"
 GLESv1_CM_PC_LIB_PRIV="-lm $PTHREAD_LIBS $DLOPEN_LIBS"
 GLESv2_LIB_DEPS="$LIBDRM_LIBS -lm $PTHREAD_LIBS $DLOPEN_LIBS"
 AC_SUBST([GLESv2_LIB_DEPS])
 AC_SUBST([GLESv2_PC_LIB_PRIV])
 
-AC_SUBST([HAVE_XF86VIDMODE])
-
 dnl
 dnl More GLX setup
 dnl

meson.build

     dep_xdamage = dependency('xdamage', version : '>= 1.1')
     dep_xfixes = dependency('xfixes')
     dep_xcb_glx = dependency('xcb-glx', version : '>= 1.8.1')
-    dep_xxf86vm = dependency('xxf86vm', required : false)
+    dep_xxf86vm = dependency('xxf86vm')
   endif
   if (with_any_vk or with_glx == 'dri' or
        (with_gallium_vdpau or with_gallium_xvmc or with_gallium_va or
   if with_dri_platform == 'drm'
     gl_priv_reqs += 'xcb-dri2 >= 1.8'
   endif
+  gl_priv_reqs += 'xxf86vm'
 endif
 if dep_libdrm.found()
   gl_priv_reqs += 'libdrm >= 2.4.75'
 endif
-if dep_xxf86vm.found()
-  gl_priv_reqs += 'xxf86vm'
-endif
 
 gl_priv_libs = []
 if dep_thread.found()

src/glx/Makefile.am

 
 EXTRA_DIST = SConscript meson.build
 
-if HAVE_XF86VIDMODE
-EXTRA_DEFINES_XF86VIDMODE = -DXF86VIDMODE
-endif
-
 AM_CFLAGS = \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/include/GL/internal \
 	-I$(top_builddir)/src/mapi/glapi \
 	-I$(top_srcdir)/src/mapi/glapi \
 	$(VISIBILITY_CFLAGS) \
-	$(EXTRA_DEFINES_XF86VIDMODE) \
 	-D_REENTRANT \
 	$(DEFINES) \
 	$(LIBDRM_CFLAGS) \

src/glx/SConscript

 env.PkgUseModules('X11')
 env.PkgUseModules('XCB')
 env.PkgUseModules('DRM')
-
-if env['HAVE_XF86VIDMODE']:
-    env.Append(CPPDEFINES = ['XF86VIDMODE'])
-    env.PkgUseModules('XF86VIDMODE')
+env.PkgUseModules('XF86VIDMODE')
 
 sources = [
     'clientattrib.c',

src/glx/glxcmds.c

 #include "util/debug.h"
 #else
 #include <sys/time.h>
-#ifdef XF86VIDMODE
 #include <X11/extensions/xf86vmode.h>
 #endif
 #endif
-#endif
 
 #include <X11/Xlib-xcb.h>
 #include <xcb/xcb.h>
 __glxGetMscRate(struct glx_screen *psc,
 		int32_t * numerator, int32_t * denominator)
 {
-#ifdef XF86VIDMODE
    XF86VidModeModeLine mode_line;
    int dot_clock;
    int i;
 
       return True;
    }
-   else
-#endif
 
    return False;
 }
 __glXGetMscRateOML(Display * dpy, GLXDrawable drawable,
                    int32_t * numerator, int32_t * denominator)
 {
-#if defined( GLX_DIRECT_RENDERING ) && defined( XF86VIDMODE )
+#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
    __GLXDRIdrawable *draw = GetGLXDRIDrawable(dpy, drawable);
 
    if (draw == NULL)

src/glx/meson.build

   '-D_REENTRANT',
 ]
 
-if dep_xxf86vm.found()
-  gl_lib_cargs += '-DHAVE_XF86VIDMODE'
-endif
-
 libglx = static_library(
   'glx',
   [files_libglx, glx_generated],
     link_args : [ld_args_bsymbolic, ld_args_gc_sections, extra_ld_args_libgl],
     dependencies : [
       dep_libdrm, dep_dl, dep_m, dep_thread, dep_x11, dep_xcb_glx, dep_xcb,
-      dep_x11_xcb, dep_xcb_dri2, dep_xext, dep_xfixes, dep_xdamage,
+      dep_x11_xcb, dep_xcb_dri2, dep_xext, dep_xfixes, dep_xdamage, dep_xxf86vm,
       extra_deps_libgl,
     ],
     version : gl_lib_version,