Remove obsolete UBL z_offset

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

 
   void unified_bed_leveling::reset() {
     set_bed_leveling_enabled(false);
-    state.z_offset = 0;
     state.storage_slot = -1;
     #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
       planner.z_fade_height = 10.0;
 
   void unified_bed_leveling::invalidate() {
     set_bed_leveling_enabled(false);
-    state.z_offset = 0;
     set_all_mesh_points_to_value(NAN);
   }
 
-  void unified_bed_leveling::set_all_mesh_points_to_value(float value) {
+  void unified_bed_leveling::set_all_mesh_points_to_value(const float value) {
     for (uint8_t x = 0; x < GRID_MAX_POINTS_X; x++) {
       for (uint8_t y = 0; y < GRID_MAX_POINTS_Y; y++) {
         z_values[x][y] = value;

Marlin/src/feature/bedlevel/ubl/ubl.h

 
 typedef struct {
   bool active = false;
-  float z_offset = 0.0;
   int8_t storage_slot = -1;
 } ubl_state;
 
     static mesh_index_pair find_closest_mesh_point_of_type(const MeshPointType, const float&, const float&, const bool, uint16_t[16], bool);
     static void reset();
     static void invalidate();
-    static void set_all_mesh_points_to_value(float);
+    static void set_all_mesh_points_to_value(const float);
     static bool sanity_check();
 
     static void G29() _O0;                          // O0 for no optimization
           strcpy(lcd_status_message, "get_z_correction() indexes out of range.");
           lcd_quick_feedback();
         #endif
-        return NAN; // this used to return state.z_offset
+        return NAN;
       }
 
       const float z1 = calc_z0(RAW_X_POSITION(lx0),
           }
         #endif
       }
-      return z0; // there used to be a +state.z_offset on this line
+      return z0;
     }
 
     /**

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

     if (parser.seen('T'))
       display_map(parser.has_value() ? parser.value_int() : 0);
 
-    /**
-     * This code may not be needed...  Prepare for its removal...
-     *
-     */
-    #if 0
-    if (parser.seen('Z')) {
-      if (parser.has_value())
-        state.z_offset = parser.value_float();   // do the simple case. Just lock in the specified value
-      else {
-        save_ubl_active_state_and_disable();
-        //float measured_z = probe_pt(g29_x_pos + X_PROBE_OFFSET_FROM_EXTRUDER, g29_y_pos + Y_PROBE_OFFSET_FROM_EXTRUDER, ProbeDeployAndStow, g29_verbose_level);
-
-        has_control_of_lcd_panel = true;     // Grab the LCD Hardware
-        float measured_z = 1.5;
-        do_blocking_move_to_z(measured_z);  // Get close to the bed, but leave some space so we don't damage anything
-                                            // The user is not going to be locking in a new Z-Offset very often so
-                                            // it won't be that painful to spin the Encoder Wheel for 1.5mm
-        lcd_refresh();
-        lcd_z_offset_edit_setup(measured_z);
-
-        KEEPALIVE_STATE(PAUSED_FOR_USER);
-
-        do {
-          measured_z = lcd_z_offset_edit();
-          idle();
-          do_blocking_move_to_z(measured_z);
-        } while (!ubl_lcd_clicked());
-
-        has_control_of_lcd_panel = true;   // There is a race condition for the encoder click.
-                                               // It could get detected in lcd_mesh_edit (actually _lcd_mesh_fine_tune)
-                                               // or here. So, until we are done looking for a long encoder press,
-                                               // we need to take control of the panel
-
-        KEEPALIVE_STATE(IN_HANDLER);
-
-        lcd_return_to_status();
-
-        const millis_t nxt = millis() + 1500UL;
-        while (ubl_lcd_clicked()) { // debounce and watch for abort
-          idle();
-          if (ELAPSED(millis(), nxt)) {
-            SERIAL_PROTOCOLLNPGM("\nZ-Offset Adjustment Stopped.");
-            do_blocking_move_to_z(Z_CLEARANCE_DEPLOY_PROBE);
-            LCD_MESSAGEPGM(MSG_UBL_Z_OFFSET_STOPPED);
-            restore_ubl_active_state_and_leave();
-            goto LEAVE;
-          }
-        }
-        has_control_of_lcd_panel = false;
-        safe_delay(20); // We don't want any switch noise.
-
-        state.z_offset = measured_z;
-
-        lcd_refresh();
-        restore_ubl_active_state_and_leave();
-      }
-    }
-    #endif
-
     LEAVE:
 
     #if ENABLED(NEWPANEL)

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

         // Note: There is no Z Correction in this case. We are off the grid and don't know what
         // a reasonable correction would be.
 
-        planner._buffer_line(end[X_AXIS], end[Y_AXIS], end[Z_AXIS] + state.z_offset, end[E_AXIS], feed_rate, extruder);
+        planner._buffer_line(end[X_AXIS], end[Y_AXIS], end[Z_AXIS], end[E_AXIS], feed_rate, extruder);
         set_current_to_destination();
 
         if (g26_debug_flag)
        */
       if (isnan(z0)) z0 = 0.0;
 
-      planner._buffer_line(end[X_AXIS], end[Y_AXIS], end[Z_AXIS] + z0 + state.z_offset, end[E_AXIS], feed_rate, extruder);
+      planner._buffer_line(end[X_AXIS], end[Y_AXIS], end[Z_AXIS] + z0, end[E_AXIS], feed_rate, extruder);
 
       if (g26_debug_flag)
         debug_current_and_destination(PSTR("FINAL_MOVE in ubl.line_to_destination()"));
             z_position = end[Z_AXIS];
           }
 
-          planner._buffer_line(x, y, z_position + z0 + state.z_offset, e_position, feed_rate, extruder);
+          planner._buffer_line(x, y, z_position + z0, e_position, feed_rate, extruder);
         } //else printf("FIRST MOVE PRUNED  ");
       }
 
             z_position = end[Z_AXIS];
           }
 
-          planner._buffer_line(x, y, z_position + z0 + state.z_offset, e_position, feed_rate, extruder);
+          planner._buffer_line(x, y, z_position + z0, e_position, feed_rate, extruder);
         } //else printf("FIRST MOVE PRUNED  ");
       }
 
           e_position = end[E_AXIS];
           z_position = end[Z_AXIS];
         }
-        planner._buffer_line(x, next_mesh_line_y, z_position + z0 + state.z_offset, e_position, feed_rate, extruder);
+        planner._buffer_line(x, next_mesh_line_y, z_position + z0, e_position, feed_rate, extruder);
         current_yi += dyi;
         yi_cnt--;
       }
           z_position = end[Z_AXIS];
         }
 
-        planner._buffer_line(next_mesh_line_x, y, z_position + z0 + state.z_offset, e_position, feed_rate, extruder);
+        planner._buffer_line(next_mesh_line_x, y, z_position + z0, e_position, feed_rate, extruder);
         current_xi += dxi;
         xi_cnt--;
       }
 
       if (!state.active || above_fade_height) {   // no mesh leveling
 
-        const float z_offset = state.active ? state.z_offset : 0.0;
-
         do {
 
           if (--segments) {     // not the last segment
             seg_le = ltarget[E_AXIS];
           }
 
-          ubl_buffer_segment_raw( seg_rx, seg_ry, seg_rz + z_offset, seg_le, feedrate );
+          ubl_buffer_segment_raw( seg_rx, seg_ry, seg_rz, seg_le, feedrate );
 
         } while (segments);
 
             z_cxcy *= fade_scaling_factor;          // apply fade factor to interpolated mesh height
           #endif
 
-          z_cxcy += state.z_offset;                 // add fixed mesh offset from G29 Z
-
           if (--segments == 0) {                    // if this is last segment, use ltarget for exact
             seg_rx = RAW_X_POSITION(ltarget[X_AXIS]);
             seg_ry = RAW_Y_POSITION(ltarget[Y_AXIS]);

Marlin/src/module/configuration_store.cpp

  *
  */
 
-#define EEPROM_VERSION "V41"
+#define EEPROM_VERSION "V42"
 
 // Change EEPROM version if these are changed:
 #define EEPROM_OFFSET 100
 
 /**
- * V41 EEPROM Layout:
+ * V42 EEPROM Layout:
  *
  *  100  Version                                    (char x4)
  *  104  EEPROM CRC16                               (uint16_t)
  *  312  G29 L F   bilinear_start                   (int x2)
  *  316            z_values[][]                     (float x9, up to float x256) +988
  *
- * AUTO_BED_LEVELING_UBL:                           6 bytes
+ * AUTO_BED_LEVELING_UBL:                           2 bytes
  *  324  G29 A     ubl.state.active                 (bool)
- *  325  G29 Z     ubl.state.z_offset               (float)
- *  329  G29 S     ubl.state.storage_slot           (int8_t)
+ *  325  G29 S     ubl.state.storage_slot           (int8_t)
  *
  * DELTA:                                           48 bytes
- *  348  M666 XYZ  delta_endstop_adj                (float x3)
+ *  344  M666 XYZ  delta_endstop_adj                (float x3)
  *  360  M665 R    delta_radius                     (float)
  *  364  M665 L    delta_diagonal_rod               (float)
  *  368  M665 S    delta_segments_per_second        (float)
 
     #if ENABLED(AUTO_BED_LEVELING_UBL)
       EEPROM_WRITE(ubl.state.active);
-      EEPROM_WRITE(ubl.state.z_offset);
       EEPROM_WRITE(ubl.state.storage_slot);
     #else
       const bool ubl_active = false;
-      dummy = 0.0f;
       const int8_t storage_slot = -1;
       EEPROM_WRITE(ubl_active);
-      EEPROM_WRITE(dummy);
       EEPROM_WRITE(storage_slot);
     #endif // AUTO_BED_LEVELING_UBL
 
 
       #if ENABLED(AUTO_BED_LEVELING_UBL)
         EEPROM_READ(ubl.state.active);
-        EEPROM_READ(ubl.state.z_offset);
         EEPROM_READ(ubl.state.storage_slot);
       #else
         uint8_t dummyui8;
         EEPROM_READ(dummyb);
-        EEPROM_READ(dummy);
         EEPROM_READ(dummyui8);
       #endif // AUTO_BED_LEVELING_UBL
 
         ubl.report_state();
 
         SERIAL_ECHOLNPAIR("\nActive Mesh Slot: ", ubl.state.storage_slot);
-
-        SERIAL_ECHOPGM("z_offset: ");
-        SERIAL_ECHO_F(ubl.state.z_offset, 6);
-        SERIAL_EOL();
-
         SERIAL_ECHOPAIR("EEPROM can hold ", calc_num_meshes());
         SERIAL_ECHOLNPGM(" meshes.\n");
       }

Marlin/src/module/planner.cpp

       #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
         // if z_fade_height enabled (nonzero) and raw_z above it, no leveling required
         if (planner.z_fade_height && planner.z_fade_height <= RAW_Z_POSITION(lz)) return;
-        lz += ubl.state.z_offset + ubl.get_z_correction(lx, ly) * ubl.fade_scaling_factor_for_z(lz);
+        lz += ubl.get_z_correction(lx, ly) * ubl.fade_scaling_factor_for_z(lz);
       #else // no fade
-        lz += ubl.state.z_offset + ubl.get_z_correction(lx, ly);
+        lz += ubl.get_z_correction(lx, ly);
       #endif // FADE
     #endif // UBL
 
 
         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 - ubl.state.z_offset - z_correct;
+                    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, O=z_offset, H=fade_height,
-          // Given P=L+O+M(1-L/H) (faded mesh correction formula for L<H)
-          //  then L=P-O-M(1-L/H)
-          //    so L=P-O-M+ML/H
-          //    so L-ML/H=P-O-M
-          //    so L(1-M/H)=P-O-M
-          //    so L=(P-O-M)/(1-M/H) for L<H
+          // 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 - ubl.state.z_offset);
+              z_logical = LOGICAL_Z_POSITION(z_physical);
             else
               z_logical /= 1.0 - z_correct * planner.inverse_z_fade_height;
           }