Use planner.leveling_active for all leveling systems

Marlin/src/core/utility.cpp

       #elif ENABLED(AUTO_BED_LEVELING_UBL)
         SERIAL_ECHOPGM("UBL");
       #endif
-      if (LEVELING_IS_ACTIVE()) {
+      if (planner.leveling_active) {
         SERIAL_ECHOLNPGM(" (enabled)");
         #if ABL_PLANAR
           const float diff[XYZ] = {
     #elif ENABLED(MESH_BED_LEVELING)
 
       SERIAL_ECHOPGM("Mesh Bed Leveling");
-      if (LEVELING_IS_ACTIVE()) {
+      if (planner.leveling_active) {
         float lz = current_position[Z_AXIS];
         planner.apply_leveling(current_position[X_AXIS], current_position[Y_AXIS], lz);
         SERIAL_ECHOLNPGM(" (enabled)");

Marlin/src/feature/bedlevel/bedlevel.cpp

 bool leveling_is_valid() {
   return
     #if ENABLED(MESH_BED_LEVELING)
-      mbl.has_mesh()
+      mbl.has_mesh
     #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
       !!bilinear_grid_spacing[X_AXIS]
     #elif ENABLED(AUTO_BED_LEVELING_UBL)
     constexpr bool can_change = true;
   #endif
 
-  if (can_change && enable != LEVELING_IS_ACTIVE()) {
+  if (can_change && enable != planner.leveling_active) {
 
     #if ENABLED(MESH_BED_LEVELING)
 
         planner.apply_leveling(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS]);
 
       const bool enabling = enable && leveling_is_valid();
-      mbl.set_active(enabling);
+      planner.leveling_active = enabling;
       if (enabling) planner.unapply_leveling(current_position);
 
     #elif ENABLED(AUTO_BED_LEVELING_UBL)
       #if PLANNER_LEVELING
-        if (ubl.state.active) {                       // leveling from on to off
+        if (planner.leveling_active) {                   // leveling from on to off
           // change unleveled current_position to physical current_position without moving steppers.
           planner.apply_leveling(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS]);
-          ubl.state.active = false;                   // disable only AFTER calling apply_leveling
+          planner.leveling_active = false;                   // disable only AFTER calling apply_leveling
         }
         else {                                        // leveling from off to on
-          ubl.state.active = true;                    // enable BEFORE calling unapply_leveling, otherwise ignored
+          planner.leveling_active = true;                    // enable BEFORE calling unapply_leveling, otherwise ignored
           // change physical current_position to unleveled current_position without moving steppers.
           planner.unapply_leveling(current_position);
         }
       #else
-        ubl.state.active = enable;                    // just flip the bit, current_position will be wrong until next move.
+        planner.leveling_active = enable;                    // just flip the bit, current_position will be wrong until next move.
       #endif
 
     #else // OLDSCHOOL_ABL
       #endif
 
       // Enable or disable leveling compensation in the planner
-      planner.abl_enabled = enable;
+      planner.leveling_active = enable;
 
       if (!enable)
         // When disabling just get the current position from the steppers.
 
   void set_z_fade_height(const float zfh) {
 
-    const bool level_active = LEVELING_IS_ACTIVE();
+    const bool level_active = planner.leveling_active;
 
     #if ENABLED(AUTO_BED_LEVELING_UBL)
       if (level_active) set_bed_leveling_enabled(false);  // turn off before changing fade height for proper apply/unapply leveling to maintain current_position
     #endif
 
-    planner.z_fade_height = zfh;
-    planner.inverse_z_fade_height = RECIPROCAL(zfh);
-    planner.force_fade_recalc();
+    planner.set_z_fade_height(zfh);
 
     if (level_active) {
       #if ENABLED(AUTO_BED_LEVELING_UBL)
   #if ENABLED(MESH_BED_LEVELING)
     if (leveling_is_valid()) {
       mbl.reset();
-      mbl.set_has_mesh(false);
+      mbl.has_mesh = false;
     }
   #else
     #if ENABLED(DEBUG_LEVELING_FEATURE)

Marlin/src/feature/bedlevel/bedlevel.h

 void set_bed_leveling_enabled(const bool enable=true);
 void reset_bed_level();
 
-#if ENABLED(MESH_BED_LEVELING)
-  #define LEVELING_IS_ACTIVE() (mbl.active())
-#elif ENABLED(AUTO_BED_LEVELING_UBL)
-  #define LEVELING_IS_ACTIVE() (ubl.state.active)
-#elif HAS_ABL
-  #define LEVELING_IS_ACTIVE() (planner.abl_enabled)
-#else
-  #define LEVELING_IS_ACTIVE() (false)
-#endif
-
 #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
   void set_z_fade_height(const float zfh);
 #endif

Marlin/src/feature/bedlevel/mbl/mesh_bed_leveling.cpp

 
   mesh_bed_leveling mbl;
 
-  uint8_t mesh_bed_leveling::status;
+  bool mesh_bed_leveling::has_mesh;
 
   float mesh_bed_leveling::z_offset,
         mesh_bed_leveling::z_values[GRID_MAX_POINTS_X][GRID_MAX_POINTS_Y],
   }
 
   void mesh_bed_leveling::reset() {
-    status = MBL_STATUS_NONE;
+    has_mesh = false;
     z_offset = 0;
     ZERO(z_values);
   }

Marlin/src/feature/bedlevel/mbl/mesh_bed_leveling.h

   MeshReset
 };
 
-enum MBLStatus {
-  MBL_STATUS_NONE = 0,
-  MBL_STATUS_HAS_MESH_BIT = 0,
-  MBL_STATUS_ACTIVE_BIT = 1
-};
-
 #define MESH_X_DIST ((MESH_MAX_X - (MESH_MIN_X)) / (GRID_MAX_POINTS_X - 1))
 #define MESH_Y_DIST ((MESH_MAX_Y - (MESH_MIN_Y)) / (GRID_MAX_POINTS_Y - 1))
 
 class mesh_bed_leveling {
 public:
-  static uint8_t status; // Has Mesh and Is Active bits
+  static bool has_mesh;
   static float z_offset,
                z_values[GRID_MAX_POINTS_X][GRID_MAX_POINTS_Y],
                index_to_xpos[GRID_MAX_POINTS_X],
 
   static void set_z(const int8_t px, const int8_t py, const float &z) { z_values[px][py] = z; }
 
-  static bool active()                       { return TEST(status, MBL_STATUS_ACTIVE_BIT); }
-  static void set_active(const bool onOff)   { onOff ? SBI(status, MBL_STATUS_ACTIVE_BIT) : CBI(status, MBL_STATUS_ACTIVE_BIT); }
-  static bool has_mesh()                     { return TEST(status, MBL_STATUS_HAS_MESH_BIT); }
-  static void set_has_mesh(const bool onOff) { onOff ? SBI(status, MBL_STATUS_HAS_MESH_BIT) : CBI(status, MBL_STATUS_HAS_MESH_BIT); }
-
   static inline void zigzag(const int8_t index, int8_t &px, int8_t &py) {
     px = index % (GRID_MAX_POINTS_X);
     py = index / (GRID_MAX_POINTS_X);

Marlin/src/feature/bedlevel/ubl/ubl.cpp

   void unified_bed_leveling::report_state() {
     echo_name();
     SERIAL_PROTOCOLPGM(" System v" UBL_VERSION " ");
-    if (!state.active) SERIAL_PROTOCOLPGM("in");
+    if (!planner.leveling_active) SERIAL_PROTOCOLPGM("in");
     SERIAL_PROTOCOLLNPGM("active.");
     safe_delay(50);
   }
     set_bed_leveling_enabled(false);
     state.storage_slot = -1;
     #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-      planner.z_fade_height = 10.0;
+      planner.set_z_fade_height(10.0);
     #endif
     ZERO(z_values);
     last_specified_z = -999.9;

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

 
       return;
     }
-    ubl_state_at_invocation = state.active;
+    ubl_state_at_invocation = planner.leveling_active;
     set_bed_leveling_enabled(false);
   }
 

Marlin/src/feature/bedlevel/ubl/ubl_motion.cpp

          */
         const float x = inf_m_flag ? start[X_AXIS] : (next_mesh_line_y - c) / m;
 
-        float z0 = z_correction_for_x_on_horizontal_mesh_line(x, current_xi, current_yi);
-
-        z0 *= planner.fade_scaling_factor_for_z(end[Z_AXIS]);
+        float z0 = z_correction_for_x_on_horizontal_mesh_line(x, current_xi, current_yi)
+                   * planner.fade_scaling_factor_for_z(end[Z_AXIS]);
 
         /**
          * If part of the Mesh is undefined, it will show up as NAN
         const float next_mesh_line_x = LOGICAL_X_POSITION(mesh_index_to_xpos(current_xi)),
                     y = m * next_mesh_line_x + c;   // Calculate Y at the next X mesh line
 
-        float z0 = z_correction_for_y_on_vertical_mesh_line(y, current_xi, current_yi);
-
-        z0 *= planner.fade_scaling_factor_for_z(end[Z_AXIS]);
+        float z0 = z_correction_for_y_on_vertical_mesh_line(y, current_xi, current_yi)
+                   * planner.fade_scaling_factor_for_z(end[Z_AXIS]);
 
         /**
          * If part of the Mesh is undefined, it will show up as NAN
 
       if (left_flag == (x > next_mesh_line_x)) { // Check if we hit the Y line first
         // Yes!  Crossing a Y Mesh Line next
-        float z0 = z_correction_for_x_on_horizontal_mesh_line(x, current_xi - left_flag, current_yi + dyi);
-
-        z0 *= planner.fade_scaling_factor_for_z(end[Z_AXIS]);
+        float z0 = z_correction_for_x_on_horizontal_mesh_line(x, current_xi - left_flag, current_yi + dyi)
+                   * planner.fade_scaling_factor_for_z(end[Z_AXIS]);
 
         /**
          * If part of the Mesh is undefined, it will show up as NAN
       }
       else {
         // Yes!  Crossing a X Mesh Line next
-        float z0 = z_correction_for_y_on_vertical_mesh_line(y, current_xi + dxi, current_yi - down_flag);
-
-        z0 *= planner.fade_scaling_factor_for_z(end[Z_AXIS]);
+        float z0 = z_correction_for_y_on_vertical_mesh_line(y, current_xi + dxi, current_yi - down_flag)
+                   * planner.fade_scaling_factor_for_z(end[Z_AXIS]);
 
         /**
          * If part of the Mesh is undefined, it will show up as NAN
             seg_rz = RAW_Z_POSITION(current_position[Z_AXIS]),
             seg_le = current_position[E_AXIS];
 
-      const bool above_fade_height = (
-        #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-          planner.z_fade_height != 0 && planner.z_fade_height < RAW_Z_POSITION(ltarget[Z_AXIS])
-        #else
-          false
-        #endif
-      );
-
       // Only compute leveling per segment if ubl active and target below z_fade_height.
 
-      if (!state.active || above_fade_height) {   // no mesh leveling
+      if (!planner.leveling_active || !planner.leveling_active_at_z(ltarget[Z_AXIS])) {   // no mesh leveling
 
         do {
 
               z_x0y1 = z_values[cell_xi  ][cell_yi+1],  // z at lower right corner
               z_x1y1 = z_values[cell_xi+1][cell_yi+1];  // z at upper right corner
 
-        if (isnan(z_x0y0)) z_x0y0 = 0;              // ideally activating state.active (G29 A)
+        if (isnan(z_x0y0)) z_x0y0 = 0;              // ideally activating planner.leveling_active (G29 A)
         if (isnan(z_x1y0)) z_x1y0 = 0;              //   should refuse if any invalid mesh points
         if (isnan(z_x0y1)) z_x0y1 = 0;              //   in order to avoid isnan tests per cell,
         if (isnan(z_x1y1)) z_x1y1 = 0;              //   thus guessing zero for undefined points

Marlin/src/gcode/bedlevel/M420.cpp

   }
 
   const bool to_enable = parser.boolval('S');
-  if (parser.seen('S'))
-    set_bed_leveling_enabled(to_enable);
+  if (parser.seen('S')) set_bed_leveling_enabled(to_enable);
 
   #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
     if (parser.seen('Z')) set_z_fade_height(parser.value_linear_units());
   #endif
 
-  const bool new_status = LEVELING_IS_ACTIVE();
+  const bool new_status = planner.leveling_active;
 
   if (to_enable && !new_status) {
     SERIAL_ERROR_START();

Marlin/src/gcode/bedlevel/abl/G29.cpp

       abl_probe_index = -1;
     #endif
 
-    abl_should_enable = LEVELING_IS_ACTIVE();
+    abl_should_enable = planner.leveling_active;
 
     #if ENABLED(AUTO_BED_LEVELING_BILINEAR)
 
     stepper.synchronize();
 
     // Disable auto bed leveling during G29
-    planner.abl_enabled = false;
+    planner.leveling_active = false;
 
     if (!dryrun) {
       // Re-orient the current position without leveling
     #if HAS_BED_PROBE
       // Deploy the probe. Probe will raise if needed.
       if (DEPLOY_PROBE()) {
-        planner.abl_enabled = abl_should_enable;
+        planner.leveling_active = abl_should_enable;
         return;
       }
     #endif
       ) {
         if (dryrun) {
           // Before reset bed level, re-enable to correct the position
-          planner.abl_enabled = abl_should_enable;
+          planner.leveling_active = abl_should_enable;
         }
         // Reset grid to 0.0 or "not probed". (Also disables ABL)
         reset_bed_level();
       #if HAS_SOFTWARE_ENDSTOPS
         soft_endstops_enabled = enable_soft_endstops;
       #endif
-      planner.abl_enabled = abl_should_enable;
+      planner.leveling_active = abl_should_enable;
       g29_in_progress = false;
       #if ENABLED(LCD_BED_LEVELING)
         lcd_wait_for_move = false;
           measured_z = faux ? 0.001 * random(-100, 101) : probe_pt(xProbe, yProbe, stow_probe_after_each, verbose_level);
 
           if (isnan(measured_z)) {
-            planner.abl_enabled = abl_should_enable;
+            planner.leveling_active = abl_should_enable;
             break;
           }
 
         yProbe = LOGICAL_Y_POSITION(points[i].y);
         measured_z = faux ? 0.001 * random(-100, 101) : probe_pt(xProbe, yProbe, stow_probe_after_each, verbose_level);
         if (isnan(measured_z)) {
-          planner.abl_enabled = abl_should_enable;
+          planner.leveling_active = abl_should_enable;
           break;
         }
         points[i].z = measured_z;
 
     // Raise to _Z_CLEARANCE_DEPLOY_PROBE. Stow the probe.
     if (STOW_PROBE()) {
-      planner.abl_enabled = abl_should_enable;
+      planner.leveling_active = abl_should_enable;
       measured_z = NAN;
     }
   }
         float converted[XYZ];
         COPY(converted, current_position);
 
-        planner.abl_enabled = true;
+        planner.leveling_active = true;
         planner.unapply_leveling(converted); // use conversion machinery
-        planner.abl_enabled = false;
+        planner.leveling_active = false;
 
         // Use the last measured distance to the bed, if possible
         if ( NEAR(current_position[X_AXIS], xProbe - (X_PROBE_OFFSET_FROM_EXTRUDER))
     #endif
 
     // Auto Bed Leveling is complete! Enable if possible.
-    planner.abl_enabled = dryrun ? abl_should_enable : true;
+    planner.leveling_active = dryrun ? abl_should_enable : true;
   } // !isnan(measured_z)
 
   // Restore state after probing
 
   KEEPALIVE_STATE(IN_HANDLER);
 
-  if (LEVELING_IS_ACTIVE())
+  if (planner.leveling_active)
     SYNC_PLAN_POSITION_KINEMATIC();
 }
 

Marlin/src/gcode/bedlevel/mbl/G29.cpp

 void echo_not_entered() { SERIAL_PROTOCOLLNPGM(" not entered."); }
 
 void mesh_probing_done() {
-  mbl.set_has_mesh(true);
+  mbl.has_mesh = true;
   gcode.home_all_axes();
   set_bed_leveling_enabled(true);
   #if ENABLED(MESH_G28_REST_ORIGIN)
   switch (state) {
     case MeshReport:
       if (leveling_is_valid()) {
-        SERIAL_PROTOCOLLNPAIR("State: ", LEVELING_IS_ACTIVE() ? MSG_ON : MSG_OFF);
+        SERIAL_PROTOCOLLNPAIR("State: ", planner.leveling_active ? MSG_ON : MSG_OFF);
         mbl_mesh_report();
       }
       else

Marlin/src/gcode/calibrate/G28.cpp

   // Disable the leveling matrix before homing
   #if HAS_LEVELING
     #if ENABLED(AUTO_BED_LEVELING_UBL)
-      const bool ubl_state_at_entry = LEVELING_IS_ACTIVE();
+      const bool ubl_state_at_entry = planner.leveling_active;
     #endif
     set_bed_leveling_enabled(false);
   #endif

Marlin/src/gcode/calibrate/M48.cpp

   // Disable bed level correction in M48 because we want the raw data when we probe
 
   #if HAS_LEVELING
-    const bool was_enabled = LEVELING_IS_ACTIVE();
+    const bool was_enabled = planner.leveling_active;
     set_bed_leveling_enabled(false);
   #endif
 

Marlin/src/lcd/ultralcd.cpp

           const float new_zoffset = zprobe_zoffset + planner.steps_to_mm[Z_AXIS] * babystep_increment;
           if (WITHIN(new_zoffset, Z_PROBE_OFFSET_RANGE_MIN, Z_PROBE_OFFSET_RANGE_MAX)) {
 
-            if (LEVELING_IS_ACTIVE())
+            if (planner.leveling_active)
               thermalManager.babystep_axis(Z_AXIS, babystep_increment);
 
             zprobe_zoffset = new_zoffset;
 
             _lcd_after_probing();
 
-            mbl.set_has_mesh(true);
+            mbl.has_mesh = true;
             mesh_probing_done();
 
           #endif
       if (!(axis_known_position[X_AXIS] && axis_known_position[Y_AXIS] && axis_known_position[Z_AXIS]))
         MENU_ITEM(gcode, MSG_AUTO_HOME, PSTR("G28"));
       else if (leveling_is_valid()) {
-        _level_state = LEVELING_IS_ACTIVE();
+        _level_state = planner.leveling_active;
         MENU_ITEM_EDIT_CALLBACK(bool, MSG_BED_LEVELING, &_level_state, _lcd_toggle_bed_leveling);
       }
 
       #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-        set_z_fade_height(planner.z_fade_height);
+        //set_z_fade_height(planner.z_fade_height);
         MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(float62, MSG_Z_FADE_HEIGHT, &planner.z_fade_height, 0.0, 100.0, _lcd_set_z_fade_height);
       #endif
 

Marlin/src/lcd/ultralcd_impl_HD44780.h

     lcd.print(ftostr52sp(FIXFLOAT(current_position[Z_AXIS])));
 
     #if HAS_LEVELING
-      lcd.write(LEVELING_IS_ACTIVE() || blink ? '_' : ' ');
+      lcd.write(planner.leveling_active || blink ? '_' : ' ');
     #endif
 
   #endif // LCD_HEIGHT > 2

Marlin/src/module/configuration_store.cpp

  *  219            z_fade_height                    (float)
  *
  * MESH_BED_LEVELING:                               43 bytes
- *  223  M420 S    from mbl.status                  (bool)
+ *  223  M420 S    planner.leveling_active         (bool)
  *  224            mbl.z_offset                     (float)
  *  228            GRID_MAX_POINTS_X                (uint8_t)
  *  229            GRID_MAX_POINTS_Y                (uint8_t)
  *  316            z_values[][]                     (float x9, up to float x256) +988
  *
  * AUTO_BED_LEVELING_UBL:                           2 bytes
- *  324  G29 A     ubl.state.active                 (bool)
+ *  324  G29 A     planner.leveling_active          (bool)
  *  325  G29 S     ubl.state.storage_slot           (int8_t)
  *
  * DELTA:                                           48 bytes
   #include "../feature/fwretract.h"
 #endif
 
+#if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
+  float new_z_fade_height;
+#endif
+
 /**
  * Post-process after Retrieve or Reset
  */
   #endif
 
   #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-    set_z_fade_height(planner.z_fade_height);
+    set_z_fade_height(new_z_fade_height);
   #endif
 
   #if HAS_BED_PROBE
     #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
       const float zfh = planner.z_fade_height;
     #else
-      const float zfh = 10.0;
+      const float zfh = 0.0;
     #endif
     EEPROM_WRITE(zfh);
 
         sizeof(mbl.z_values) == GRID_MAX_POINTS * sizeof(mbl.z_values[0][0]),
         "MBL Z array is the wrong size."
       );
-      const bool leveling_is_on = TEST(mbl.status, MBL_STATUS_HAS_MESH_BIT);
+      const bool leveling_is_on = mbl.has_mesh;
       const uint8_t mesh_num_x = GRID_MAX_POINTS_X, mesh_num_y = GRID_MAX_POINTS_Y;
       EEPROM_WRITE(leveling_is_on);
       EEPROM_WRITE(mbl.z_offset);
     #endif // AUTO_BED_LEVELING_BILINEAR
 
     #if ENABLED(AUTO_BED_LEVELING_UBL)
-      EEPROM_WRITE(ubl.state.active);
+      EEPROM_WRITE(planner.leveling_active);
       EEPROM_WRITE(ubl.state.storage_slot);
     #else
       const bool ubl_active = false;
       //
 
       #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-        EEPROM_READ(planner.z_fade_height);
+        EEPROM_READ(new_z_fade_height);
       #else
         EEPROM_READ(dummy);
       #endif
       EEPROM_READ(mesh_num_y);
 
       #if ENABLED(MESH_BED_LEVELING)
-        mbl.status = leveling_is_on ? _BV(MBL_STATUS_HAS_MESH_BIT) : 0;
+        mbl.has_mesh = leveling_is_on;
         mbl.z_offset = dummy;
         if (mesh_num_x == GRID_MAX_POINTS_X && mesh_num_y == GRID_MAX_POINTS_Y) {
           // EEPROM data fits the current mesh
         }
 
       #if ENABLED(AUTO_BED_LEVELING_UBL)
-        EEPROM_READ(ubl.state.active);
+        EEPROM_READ(planner.leveling_active);
         EEPROM_READ(ubl.state.storage_slot);
       #else
         uint8_t dummyui8;
   planner.max_jerk[E_AXIS] = DEFAULT_EJERK;
 
   #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-    planner.z_fade_height = 0.0;
+    new_z_fade_height = 0.0;
   #endif
 
   #if HAS_HOME_OFFSET
         SERIAL_ECHOLNPGM(":");
       }
       CONFIG_ECHO_START;
-      SERIAL_ECHOPAIR("  M420 S", LEVELING_IS_ACTIVE() ? 1 : 0);
+      SERIAL_ECHOPAIR("  M420 S", planner.leveling_active ? 1 : 0);
       #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-        SERIAL_ECHOPAIR(" Z", planner.z_fade_height);
+        SERIAL_ECHOPAIR(" Z", LINEAR_UNIT(planner.z_fade_height));
       #endif
       SERIAL_EOL();
 
         SERIAL_ECHOLNPGM("Auto Bed Leveling:");
       }
       CONFIG_ECHO_START;
-      SERIAL_ECHOPAIR("  M420 S", LEVELING_IS_ACTIVE() ? 1 : 0);
+      SERIAL_ECHOPAIR("  M420 S", planner.leveling_active ? 1 : 0);
       #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
         SERIAL_ECHOPAIR(" Z", LINEAR_UNIT(planner.z_fade_height));
       #endif

Marlin/src/module/motion.cpp

   #if ENABLED(AUTO_BED_LEVELING_BILINEAR)
     #if ENABLED(DELTA)
       #define ADJUST_DELTA(V) \
-        if (LEVELING_IS_ACTIVE()) { \
+        if (planner.leveling_active) { \
           const float zadj = bilinear_z_offset(V); \
           delta[A_AXIS] += zadj; \
           delta[B_AXIS] += zadj; \
           delta[C_AXIS] += zadj; \
         }
     #else
-      #define ADJUST_DELTA(V) if (LEVELING_IS_ACTIVE()) { delta[Z_AXIS] += bilinear_z_offset(V); }
+      #define ADJUST_DELTA(V) if (planner.leveling_active) { delta[Z_AXIS] += bilinear_z_offset(V); }
     #endif
   #else
     #define ADJUST_DELTA(V) NOOP
 
   /**
    * Prepare a linear move in a Cartesian setup.
-   * If Mesh Bed Leveling is enabled, perform a mesh move.
+   * Bed Leveling will be applied to the move if enabled.
    *
-   * Returns true if the caller didn't update current_position.
+   * Returns true if current_position[] was set to destination[]
    */
   inline bool prepare_move_to_destination_cartesian() {
-    #if ENABLED(AUTO_BED_LEVELING_UBL)
+    if (current_position[X_AXIS] != destination[X_AXIS] || current_position[Y_AXIS] != destination[Y_AXIS]) {
       const float fr_scaled = MMS_SCALED(feedrate_mm_s);
-      if (ubl.state.active) { // direct use of ubl.state.active for speed
-        ubl.line_to_destination_cartesian(fr_scaled, active_extruder);
-        return true;
-      }
-      else
-        line_to_destination(fr_scaled);
-    #else
-      // Do not use feedrate_percentage for E or Z only moves
-      if (current_position[X_AXIS] == destination[X_AXIS] && current_position[Y_AXIS] == destination[Y_AXIS])
-        line_to_destination();
-      else {
-        const float fr_scaled = MMS_SCALED(feedrate_mm_s);
-        #if ENABLED(MESH_BED_LEVELING)
-          if (mbl.active()) { // direct used of mbl.active() for speed
+      #if HAS_MESH
+        if (planner.leveling_active) {
+          #if ENABLED(AUTO_BED_LEVELING_UBL)
+            ubl.line_to_destination_cartesian(fr_scaled, active_extruder);
+          #elif ENABLED(MESH_BED_LEVELING)
             mesh_line_to_destination(fr_scaled);
-            return true;
-          }
-          else
-        #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
-          if (planner.abl_enabled) { // direct use of abl_enabled for speed
+          #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
             bilinear_line_to_destination(fr_scaled);
-            return true;
-          }
-          else
-        #endif
-            line_to_destination(fr_scaled);
-      }
-    #endif
+          #endif
+          return true;
+        }
+      #endif // HAS_MESH
+      line_to_destination(fr_scaled);
+    }
+    else
+      line_to_destination();
+
     return false;
   }
 
 
   /**
    * Prepare a linear move in a dual X axis setup
+   *
+   * Return true if current_position[] was set to destination[]
    */
   inline bool prepare_move_to_destination_dualx() {
     if (active_extruder_parked) {

Marlin/src/module/planner.cpp

       Planner::max_jerk[XYZE],       // The largest speed change requiring no acceleration
       Planner::min_travel_feedrate_mm_s;
 
-#if OLDSCHOOL_ABL
-  bool Planner::abl_enabled = false; // Flag that auto bed leveling is enabled
+#if HAS_LEVELING
+  bool Planner::leveling_active = false; // Flag that auto bed leveling is enabled
   #if ABL_PLANAR
     matrix_3x3 Planner::bed_level_matrix; // Transform to compensate for bed level
   #endif
    */
   void Planner::apply_leveling(float &lx, float &ly, float &lz) {
 
-    if (!LEVELING_IS_ACTIVE()) return;
+    if (!planner.leveling_active) return;
 
     #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
       const float fade_scaling_factor = fade_scaling_factor_for_z(lz);
 
   void Planner::unapply_leveling(float logical[XYZ]) {
 
-    #if ENABLED(AUTO_BED_LEVELING_UBL)
-
-      if (ubl.state.active) {
-
-        const float z_physical = RAW_Z_POSITION(logical[Z_AXIS]),
-                    z_correct = ubl.get_z_correction(logical[X_AXIS], logical[Y_AXIS]),
-                    z_virtual = z_physical - z_correct;
-              float z_logical = LOGICAL_Z_POSITION(z_virtual);
-
-        #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-
-          // for P=physical_z, L=logical_z, M=mesh_z, H=fade_height,
-          // Given P=L+M(1-L/H) (faded mesh correction formula for L<H)
-          //  then L=P-M(1-L/H)
-          //    so L=P-M+ML/H
-          //    so L-ML/H=P-M
-          //    so L(1-M/H)=P-M
-          //    so L=(P-M)/(1-M/H) for L<H
+    if (!planner.leveling_active) return;
 
-          if (planner.z_fade_height) {
-            if (z_logical >= planner.z_fade_height)
-              z_logical = LOGICAL_Z_POSITION(z_physical);
-            else
-              z_logical /= 1.0 - z_correct * planner.inverse_z_fade_height;
-          }
+    #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
+      if (z_fade_height && RAW_Z_POSITION(logical[Z_AXIS]) >= z_fade_height) return;
+    #endif
 
-        #endif // ENABLE_LEVELING_FADE_HEIGHT
+    #if ENABLED(AUTO_BED_LEVELING_UBL)
 
-        logical[Z_AXIS] = z_logical;
-      }
+      const float z_physical = RAW_Z_POSITION(logical[Z_AXIS]),
+                  z_correct = ubl.get_z_correction(logical[X_AXIS], logical[Y_AXIS]),
+                  z_virtual = z_physical - z_correct;
+            float z_logical = LOGICAL_Z_POSITION(z_virtual);
 
-      return; // don't fall thru to other ENABLE_LEVELING_FADE_HEIGHT logic
+      #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
 
-    #endif
+        // for P=physical_z, L=logical_z, M=mesh_z, H=fade_height,
+        // Given P=L+M(1-L/H) (faded mesh correction formula for L<H)
+        //  then L=P-M(1-L/H)
+        //    so L=P-M+ML/H
+        //    so L-ML/H=P-M
+        //    so L(1-M/H)=P-M
+        //    so L=(P-M)/(1-M/H) for L<H
+
+        if (planner.z_fade_height) {
+          if (z_logical >= planner.z_fade_height)
+            z_logical = LOGICAL_Z_POSITION(z_physical);
+          else
+            z_logical /= 1.0 - z_correct * planner.inverse_z_fade_height;
+        }
 
-    if (!LEVELING_IS_ACTIVE()) return;
+      #endif // ENABLE_LEVELING_FADE_HEIGHT
 
-    #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-      if (z_fade_height && RAW_Z_POSITION(logical[Z_AXIS]) >= z_fade_height) return;
-    #endif
+      logical[Z_AXIS] = z_logical;
 
-    #if ENABLED(MESH_BED_LEVELING)
+    #elif ENABLED(MESH_BED_LEVELING)
 
       #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
         const float c = mbl.get_z(RAW_X_POSITION(logical[X_AXIS]), RAW_Y_POSITION(logical[Y_AXIS]), 1.0);

Marlin/src/module/planner.h

                  max_jerk[XYZE],       // The largest speed change requiring no acceleration
                  min_travel_feedrate_mm_s;
 
-    #if OLDSCHOOL_ABL
-      static bool abl_enabled;              // Flag that bed leveling is enabled
+    #if HAS_LEVELING
+      static bool leveling_active;              // Flag that bed leveling is enabled
       #if ABL_PLANAR
         static matrix_3x3 bed_level_matrix; // Transform to compensate for bed level
       #endif
-    #endif
-
-    #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-      static float z_fade_height, inverse_z_fade_height;
+      #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
+        static float z_fade_height, inverse_z_fade_height;
+      #endif
     #endif
 
     #if ENABLED(LIN_ADVANCE)
 
       FORCE_INLINE static void force_fade_recalc() { last_raw_lz = -999.999; }
 
+      FORCE_INLINE static void set_z_fade_height(const float &zfh) {
+        z_fade_height = zfh > 0 ? zfh : 0;
+        inverse_z_fade_height = RECIPROCAL(z_fade_height);
+        force_fade_recalc();
+      }
+
+      FORCE_INLINE static bool leveling_active_at_z(const float &lz) {
+        return !z_fade_height || RAW_Z_POSITION(lz) < z_fade_height;
+      }
+
     #else
 
       FORCE_INLINE static float fade_scaling_factor_for_z(const float &lz) {
         return 1.0;
       }
 
+      FORCE_INLINE static bool leveling_active_at_z(const float &lz) { return true; }
+
     #endif
 
     #if PLANNER_LEVELING

Marlin/src/module/probe.cpp

     #endif
 
     #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
-      if (!no_babystep && LEVELING_IS_ACTIVE())
+      if (!no_babystep && planner.leveling_active)
         thermalManager.babystep_axis(Z_AXIS, -LROUND(diff * planner.axis_steps_per_mm[Z_AXIS]));
     #else
       UNUSED(no_babystep);

Marlin/src/module/tool_change.cpp

 
             #if ENABLED(MESH_BED_LEVELING)
 
-              if (LEVELING_IS_ACTIVE()) {
+              if (planner.leveling_active) {
                 #if ENABLED(DEBUG_LEVELING_FEATURE)
                   if (DEBUGGING(LEVELING)) SERIAL_ECHOPAIR("Z before MBL: ", current_position[Z_AXIS]);
                 #endif