Cleanup: Simplify use of 'Snapping Gears'

This commit removes `t->snap[0]` and `t->snap_spatial[0]`.

They were not actually being used, and could add overhead for
transformation without snap.

source/blender/editors/transform/transform.c

@@ -1622,40 +1622,34 @@ void saveTransform(bContext *C, TransInfo *t, wmOperator *op)
   }
 }
 
-static void initSnapSpatial(TransInfo *t, float r_snap[3])
+static void initSnapSpatial(TransInfo *t, float r_snap[2])
 {
   if (t->spacetype == SPACE_VIEW3D) {
     RegionView3D *rv3d = t->region->regiondata;
 
     if (rv3d) {
       View3D *v3d = t->area->spacedata.first;
-      r_snap[0] = 0.0f;
-      r_snap[1] = ED_view3d_grid_view_scale(t->scene, v3d, rv3d, NULL) * 1.0f;
-      r_snap[2] = r_snap[1] * 0.1f;
+      r_snap[0] = ED_view3d_grid_view_scale(t->scene, v3d, rv3d, NULL) * 1.0f;
+      r_snap[1] = r_snap[0] * 0.1f;
     }
   }
   else if (t->spacetype == SPACE_IMAGE) {
-    r_snap[0] = 0.0f;
-    r_snap[1] = 0.0625f;
-    r_snap[2] = 0.03125f;
+    r_snap[0] = 0.0625f;
+    r_snap[1] = 0.03125f;
   }
   else if (t->spacetype == SPACE_CLIP) {
-    r_snap[0] = 0.0f;
-    r_snap[1] = 0.125f;
-    r_snap[2] = 0.0625f;
+    r_snap[0] = 0.125f;
+    r_snap[1] = 0.0625f;
   }
   else if (t->spacetype == SPACE_NODE) {
-    r_snap[0] = 0.0f;
-    r_snap[1] = r_snap[2] = ED_node_grid_size();
+    r_snap[0] = r_snap[1] = ED_node_grid_size();
   }
   else if (t->spacetype == SPACE_GRAPH) {
-    r_snap[0] = 0.0f;
-    r_snap[1] = 1.0;
-    r_snap[2] = 0.1f;
+    r_snap[0] = 1.0;
+    r_snap[1] = 0.1f;
   }
   else {
-    r_snap[0] = 0.0f;
-    r_snap[1] = r_snap[2] = 1.0f;
+    r_snap[0] = r_snap[1] = 1.0f;
   }
 }
 

source/blender/editors/transform/transform.h

@@ -316,9 +316,9 @@ typedef struct TransInfo {
   /** maximum index on the input vector. */
   short idx_max;
   /** Snapping Gears. */
-  float snap[3];
+  float snap[2];
   /** Spatial snapping gears(even when rotating, scaling... etc). */
-  float snap_spatial[3];
+  float snap_spatial[2];
   /** Mouse side of the current frame, 'L', 'R' or 'B' */
   char frame_side;
 

source/blender/editors/transform/transform_gizmo_3d.c

@@ -1280,7 +1280,7 @@ void drawDial3d(const TransInfo *t)
     float mat_basis[4][4];
     float mat_final[4][4];
     float color[4];
-    float increment;
+    float increment = 0.0f;
     float line_with = GIZMO_AXIS_LINE_WIDTH + 1.0f;
     float scale = UI_DPI_FAC * U.gizmo_size;
 
@@ -1335,10 +1335,7 @@ void drawDial3d(const TransInfo *t)
 
     if (activeSnap(t) && (!transformModeUseSnap(t) ||
                           (t->tsnap.mode & (SCE_SNAP_MODE_INCREMENT | SCE_SNAP_MODE_GRID)))) {
-      increment = (t->modifiers & MOD_PRECISION) ? t->snap[2] : t->snap[1];
-    }
-    else {
-      increment = t->snap[0];
+      increment = (t->modifiers & MOD_PRECISION) ? t->snap[1] : t->snap[0];
     }
 
     BLI_assert(axis_idx >= MAN_AXIS_RANGE_ROT_START && axis_idx < MAN_AXIS_RANGE_ROT_END);

source/blender/editors/transform/transform_mode_baketime.c

@@ -125,11 +125,10 @@ void initBakeTime(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 1.0f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 1.0f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE; /* Don't think this uses units? */
 }

source/blender/editors/transform/transform_mode_bbone_resize.c

@@ -175,11 +175,10 @@ void initBoneSize(TransInfo *t)
   t->num.val_flag[1] |= NUM_NULL_ONE;
   t->num.val_flag[2] |= NUM_NULL_ONE;
   t->num.flag |= NUM_AFFECT_ALL;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
   t->num.unit_type[1] = B_UNIT_NONE;

source/blender/editors/transform/transform_mode_bend.c

@@ -102,7 +102,7 @@ static void Bend(TransInfo *t, const int UNUSED(mval[2]))
    * this isnt essential but nicer to give reasonable snapping values for radius */
   if (t->tsnap.mode & SCE_SNAP_MODE_INCREMENT) {
     const float radius_snap = 0.1f;
-    const float snap_hack = (t->snap[1] * data->warp_init_dist) / radius_snap;
+    const float snap_hack = (t->snap[0] * data->warp_init_dist) / radius_snap;
     values.scale *= snap_hack;
     transform_snap_increment(t, values.vector);
     values.scale /= snap_hack;
@@ -261,11 +261,10 @@ void initBend(TransInfo *t)
 
   t->idx_max = 1;
   t->num.idx_max = 1;
-  t->snap[0] = 0.0f;
-  t->snap[1] = SNAP_INCREMENTAL_ANGLE;
-  t->snap[2] = t->snap[1] * 0.2;
+  t->snap[0] = SNAP_INCREMENTAL_ANGLE;
+  t->snap[1] = t->snap[0] * 0.2;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_use_radians = (t->scene->unit.system_rotation == USER_UNIT_ROT_RADIANS);
   t->num.unit_type[0] = B_UNIT_ROTATION;

source/blender/editors/transform/transform_mode_boneenvelope.c

@@ -102,11 +102,10 @@ void initBoneEnvelope(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_boneroll.c

@@ -97,11 +97,10 @@ void initBoneRoll(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = DEG2RAD(5.0);
-  t->snap[2] = DEG2RAD(1.0);
+  t->snap[0] = DEG2RAD(5.0);
+  t->snap[1] = DEG2RAD(1.0);
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_use_radians = (t->scene->unit.system_rotation == USER_UNIT_ROT_RADIANS);
   t->num.unit_type[0] = B_UNIT_ROTATION;

source/blender/editors/transform/transform_mode_curveshrinkfatten.c

@@ -102,11 +102,10 @@ void initCurveShrinkFatten(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_edge_bevelweight.c

@@ -113,11 +113,10 @@ void initBevelWeight(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_edge_crease.c

@@ -117,11 +117,10 @@ void initCrease(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_edge_rotate_normal.c

@@ -134,11 +134,10 @@ void initNormalRotation(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = DEG2RAD(5.0);
-  t->snap[2] = DEG2RAD(1.0);
+  t->snap[0] = DEG2RAD(5.0);
+  t->snap[1] = DEG2RAD(1.0);
 
-  copy_v3_fl(t->num.val_inc, t->snap[2]);
+  copy_v3_fl(t->num.val_inc, t->snap[1]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_use_radians = (t->scene->unit.system_rotation == USER_UNIT_ROT_RADIANS);
   t->num.unit_type[0] = B_UNIT_ROTATION;

source/blender/editors/transform/transform_mode_edge_seq_slide.c

@@ -135,11 +135,10 @@ void initSeqSlide(TransInfo *t)
   t->num.flag = 0;
   t->num.idx_max = t->idx_max;
 
-  t->snap[0] = 0.0f;
-  t->snap[1] = floorf(t->scene->r.frs_sec / t->scene->r.frs_sec_base);
-  t->snap[2] = 10.0f;
+  t->snap[0] = floorf(t->scene->r.frs_sec / t->scene->r.frs_sec_base);
+  t->snap[1] = 10.0f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   /* Would be nice to have a time handling in units as well
    * (supporting frames in addition to "natural" time...). */

source/blender/editors/transform/transform_mode_edge_slide.c

@@ -1555,11 +1555,10 @@ void initEdgeSlide_ex(
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_gpopacity.c

@@ -98,11 +98,10 @@ void initGPOpacity(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_gpshrinkfatten.c

@@ -100,11 +100,10 @@ void initGPShrinkFatten(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_maskshrinkfatten.c

@@ -128,11 +128,10 @@ void initMaskShrinkFatten(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_push_pull.c

@@ -122,11 +122,10 @@ void initPushPull(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 1.0f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 1.0f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_LENGTH;
 }

source/blender/editors/transform/transform_mode_resize.c

@@ -188,11 +188,10 @@ void initResize(TransInfo *t)
 
   t->idx_max = 2;
   t->num.idx_max = 2;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
   t->num.unit_type[1] = B_UNIT_NONE;

source/blender/editors/transform/transform_mode_rotate.c

@@ -244,11 +244,10 @@ void initRotation(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = DEG2RAD(5.0);
-  t->snap[2] = DEG2RAD(1.0);
+  t->snap[0] = DEG2RAD(5.0);
+  t->snap[1] = DEG2RAD(1.0);
 
-  copy_v3_fl(t->num.val_inc, t->snap[2]);
+  copy_v3_fl(t->num.val_inc, t->snap[1]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_use_radians = (t->scene->unit.system_rotation == USER_UNIT_ROT_RADIANS);
   t->num.unit_type[0] = B_UNIT_ROTATION;

source/blender/editors/transform/transform_mode_shear.c

@@ -226,11 +226,10 @@ void initShear(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE; /* Don't think we have any unit here? */
 

source/blender/editors/transform/transform_mode_shrink_fatten.c

@@ -128,11 +128,10 @@ void initShrinkFatten(TransInfo *t)
 
     t->idx_max = 0;
     t->num.idx_max = 0;
-    t->snap[0] = 0.0f;
-    t->snap[1] = 1.0f;
-    t->snap[2] = t->snap[1] * 0.1f;
+    t->snap[0] = 1.0f;
+    t->snap[1] = t->snap[0] * 0.1f;
 
-    copy_v3_fl(t->num.val_inc, t->snap[1]);
+    copy_v3_fl(t->num.val_inc, t->snap[0]);
     t->num.unit_sys = t->scene->unit.system;
     t->num.unit_type[0] = B_UNIT_LENGTH;
 

source/blender/editors/transform/transform_mode_skin_resize.c

@@ -123,11 +123,10 @@ void initSkinResize(TransInfo *t)
 
   t->idx_max = 2;
   t->num.idx_max = 2;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
   t->num.unit_type[1] = B_UNIT_NONE;

source/blender/editors/transform/transform_mode_tilt.c

@@ -101,11 +101,10 @@ void initTilt(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = DEG2RAD(5.0);
-  t->snap[2] = DEG2RAD(1.0);
+  t->snap[0] = DEG2RAD(5.0);
+  t->snap[1] = DEG2RAD(1.0);
 
-  copy_v3_fl(t->num.val_inc, t->snap[2]);
+  copy_v3_fl(t->num.val_inc, t->snap[1]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_use_radians = (t->scene->unit.system_rotation == USER_UNIT_ROT_RADIANS);
   t->num.unit_type[0] = B_UNIT_ROTATION;

source/blender/editors/transform/transform_mode_timescale.c

@@ -148,10 +148,9 @@ void initTimeScale(TransInfo *t)
   t->num.idx_max = t->idx_max;
 
   /* initialize snap like for everything else */
-  t->snap[0] = 0.0f;
-  t->snap[1] = t->snap[2] = 1.0f;
+  t->snap[0] = t->snap[1] = 1.0f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 }

source/blender/editors/transform/transform_mode_timeslide.c

@@ -225,10 +225,9 @@ void initTimeSlide(TransInfo *t)
   t->num.idx_max = t->idx_max;
 
   /* initialize snap like for everything else */
-  t->snap[0] = 0.0f;
-  t->snap[1] = t->snap[2] = 1.0f;
+  t->snap[0] = t->snap[1] = 1.0f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   /* No time unit supporting frames currently... */
   t->num.unit_type[0] = B_UNIT_NONE;

source/blender/editors/transform/transform_mode_timetranslate.c

@@ -155,10 +155,9 @@ void initTimeTranslate(TransInfo *t)
   t->num.idx_max = t->idx_max;
 
   /* initialize snap like for everything else */
-  t->snap[0] = 0.0f;
-  t->snap[1] = t->snap[2] = 1.0f;
+  t->snap[0] = t->snap[1] = 1.0f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   /* No time unit supporting frames currently... */
   t->num.unit_type[0] = B_UNIT_NONE;

source/blender/editors/transform/transform_mode_tosphere.c

@@ -111,11 +111,10 @@ void initToSphere(TransInfo *t)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_mode_trackball.c

@@ -151,11 +151,10 @@ void initTrackball(TransInfo *t)
 
   t->idx_max = 1;
   t->num.idx_max = 1;
-  t->snap[0] = 0.0f;
-  t->snap[1] = DEG2RAD(5.0);
-  t->snap[2] = DEG2RAD(1.0);
+  t->snap[0] = DEG2RAD(5.0);
+  t->snap[1] = DEG2RAD(1.0);
 
-  copy_v3_fl(t->num.val_inc, t->snap[2]);
+  copy_v3_fl(t->num.val_inc, t->snap[1]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_use_radians = (t->scene->unit.system_rotation == USER_UNIT_ROT_RADIANS);
   t->num.unit_type[0] = B_UNIT_ROTATION;

source/blender/editors/transform/transform_mode_translate.c

@@ -449,9 +449,9 @@ void initTranslation(TransInfo *t)
   t->num.flag = 0;
   t->num.idx_max = t->idx_max;
 
-  copy_v3_v3(t->snap, t->snap_spatial);
+  copy_v2_v2(t->snap, t->snap_spatial);
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   if (t->spacetype == SPACE_VIEW3D) {
     /* Handling units makes only sense in 3Dview... See T38877. */

source/blender/editors/transform/transform_mode_vert_slide.c

@@ -675,11 +675,10 @@ void initVertSlide_ex(TransInfo *t, bool use_even, bool flipped, bool use_clamp)
 
   t->idx_max = 0;
   t->num.idx_max = 0;
-  t->snap[0] = 0.0f;
-  t->snap[1] = 0.1f;
-  t->snap[2] = t->snap[1] * 0.1f;
+  t->snap[0] = 0.1f;
+  t->snap[1] = t->snap[0] * 0.1f;
 
-  copy_v3_fl(t->num.val_inc, t->snap[1]);
+  copy_v3_fl(t->num.val_inc, t->snap[0]);
   t->num.unit_sys = t->scene->unit.system;
   t->num.unit_type[0] = B_UNIT_NONE;
 

source/blender/editors/transform/transform_snap.c

@@ -384,7 +384,7 @@ void applyGridAbsolute(TransInfo *t)
     return;
   }
 
-  float grid_size = (t->modifiers & MOD_PRECISION) ? t->snap_spatial[2] : t->snap_spatial[1];
+  float grid_size = (t->modifiers & MOD_PRECISION) ? t->snap_spatial[1] : t->snap_spatial[0];
 
   /* early exit on unusable grid size */
   if (grid_size == 0.0f) {
@@ -1462,7 +1462,7 @@ bool transform_snap_grid(TransInfo *t, float *val)
     return false;
   }
 
-  float grid_dist = (t->modifiers & MOD_PRECISION) ? t->snap[2] : t->snap[1];
+  float grid_dist = (t->modifiers & MOD_PRECISION) ? t->snap[1] : t->snap[0];
 
   /* Early bailing out if no need to snap */
   if (grid_dist == 0.0f) {
@@ -1523,6 +1523,10 @@ static void snap_increment_apply(TransInfo *t,
 
 bool transform_snap_increment(TransInfo *t, float *val)
 {
+  if (!activeSnap(t)) {
+    return false;
+  }
+
   if (!(t->tsnap.mode & SCE_SNAP_MODE_INCREMENT) && !doForceIncrementSnap(t)) {
     return false;
   }
@@ -1533,8 +1537,7 @@ bool transform_snap_increment(TransInfo *t, float *val)
     return false;
   }
 
-  float increment_dist = activeSnap(t) ? (t->modifiers & MOD_PRECISION) ? t->snap[2] : t->snap[1] :
-                                         t->snap[0];
+  float increment_dist = (t->modifiers & MOD_PRECISION) ? t->snap[1] : t->snap[0];
 
   snap_increment_apply(t, t->idx_max, increment_dist, val);
   return true;