Commit: 08b59ab7b928ae2c7ae96bf150a2c621f44ae786
Author: mano-wii
Date:   Fri Jul 14 16:52:31 2017 -0300
Branches: master
https://developer.blender.org/rB08b59ab7b928ae2c7ae96bf150a2c621f44ae786

Snap System: Use function that does the interactor instead of Macro

Macro makes debugging difficult. And in that case I was escaping from the style 
used in Blender

===================================================================

M       source/blender/editors/transform/transform_snap_object.c

===================================================================

diff --git a/source/blender/editors/transform/transform_snap_object.c 
b/source/blender/editors/transform/transform_snap_object.c
index 761fb3b5b35..61f4914a3f0 100644
--- a/source/blender/editors/transform/transform_snap_object.c
+++ b/source/blender/editors/transform/transform_snap_object.c
@@ -139,43 +139,55 @@ struct SnapObjectContext {
 * \{ */
 
 
-#define ITER_SNAP_OBJECTS(use_obedit, ob, obmat, sctx, snap_select, obedit, 
CODE) \
-       Base *base_act = sctx->scene->basact;\
-       /* Need an exception for particle edit because the base is flagged with 
BA_HAS_RECALC_DATA\
-        * which makes the loop skip it, even the derived mesh will never 
change\
-        *\
-        * To solve that problem, we do it first as an exception.\
-        * */\
-       if (base_act && base_act->object && base_act->object->mode & 
OB_MODE_PARTICLE_EDIT) {\
-               use_obedit = false;\
-               ob = base_act->object;\
-               obmat = ob->obmat;\
-               CODE\
-       }\
-       for (Base *base = sctx->scene->base.first; base != NULL; base = 
base->next) {\
-               if ((BASE_VISIBLE_BGMODE(sctx->v3d_data.v3d, sctx->scene, 
base)) &&\
-                   (base->flag & (BA_HAS_RECALC_OB | BA_HAS_RECALC_DATA)) == 0 
&&\
-                       !((snap_select == SNAP_NOT_SELECTED && (base->flag & 
(SELECT | BA_WAS_SEL))) ||\
-                         (snap_select == SNAP_NOT_ACTIVE && base == 
base_act)))\
-               {\
-                       Object *obj = base->object;\
-                       if (obj->transflag & OB_DUPLI) {\
-                               DupliObject *dupli_ob;\
-                               ListBase *lb = 
object_duplilist(sctx->bmain->eval_ctx, sctx->scene, obj);\
-                               for (dupli_ob = lb->first; dupli_ob; dupli_ob = 
dupli_ob->next) {\
-                                       use_obedit = obedit && 
dupli_ob->ob->data == obedit->data;;\
-                                       ob = use_obedit ? obedit : 
dupli_ob->ob;\
-                                       obmat = dupli_ob->mat;\
-                                       CODE\
-                               }\
-                               free_object_duplilist(lb);\
-                       }\
-                       use_obedit = obedit && obj->data == obedit->data;\
-                       ob = use_obedit ? obedit : obj;\
-                       obmat = ob->obmat;\
-                       CODE\
-               }\
-       }\
+typedef void(*IterSnapObjsCallback)(SnapObjectContext *sctx, bool is_obedit, 
Object *ob, float obmat[4][4], void *data);
+
+/**
+ * Walks through all objects in the scene to create the list of objets to snap.
+ *
+ * \param sctx: Snap context to store data.
+ * \param snap_select : from enum SnapSelect.
+ * \param obedit : Object Edited to use its coordinates of BMesh(if any) to do 
the snapping.
+ */
+static void iter_snap_objects(
+        SnapObjectContext *sctx,
+        const SnapSelect snap_select,
+        Object *obedit,
+        IterSnapObjsCallback sob_callback,
+        void *data)
+{
+       Base *base_act = sctx->scene->basact;
+       /* Need an exception for particle edit because the base is flagged with 
BA_HAS_RECALC_DATA
+        * which makes the loop skip it, even the derived mesh will never change
+        *
+        * To solve that problem, we do it first as an exception.
+        * */
+       if (base_act && base_act->object && base_act->object->mode & 
OB_MODE_PARTICLE_EDIT) {
+               sob_callback(sctx, false, base_act->object, 
base_act->object->obmat, data);
+       }
+
+       for (Base *base = sctx->scene->base.first; base != NULL; base = 
base->next) {
+               if ((BASE_VISIBLE_BGMODE(sctx->v3d_data.v3d, sctx->scene, 
base)) &&
+                   (base->flag & (BA_HAS_RECALC_OB | BA_HAS_RECALC_DATA)) == 0 
&&
+                       !((snap_select == SNAP_NOT_SELECTED && (base->flag & 
(SELECT | BA_WAS_SEL))) ||
+                         (snap_select == SNAP_NOT_ACTIVE && base == base_act)))
+               {
+                       bool use_obedit;
+                       Object *obj = base->object;
+                       if (obj->transflag & OB_DUPLI) {
+                               DupliObject *dupli_ob;
+                               ListBase *lb = 
object_duplilist(sctx->bmain->eval_ctx, sctx->scene, obj);
+                               for (dupli_ob = lb->first; dupli_ob; dupli_ob = 
dupli_ob->next) {
+                                       use_obedit = obedit && 
dupli_ob->ob->data == obedit->data;
+                                       sob_callback(sctx, use_obedit, 
use_obedit ? obedit : dupli_ob->ob, dupli_ob->mat, data);
+                               }
+                               free_object_duplilist(lb);
+                       }
+
+                       use_obedit = obedit && obj->data == obedit->data;
+                       sob_callback(sctx, use_obedit, use_obedit ? obedit : 
obj, obj->obmat, data);
+               }
+       }
+}
 
 
 /**
@@ -768,6 +780,37 @@ static bool raycastObj(
 }
 
 
+struct RaycastObjUserData {
+       const float *ray_orig;
+       const float *ray_start;
+       const float *ray_dir;
+       const float *depth_range;
+       const unsigned int ob_index;
+       /* read/write args */
+       float *ray_depth;
+       /* return args */
+       float *r_loc;
+       float *r_no;
+       int *r_index;
+       Object **r_ob;
+       float (*r_obmat)[4];
+       ListBase *r_hit_list;
+       bool ret;
+};
+
+static void raycast_obj_cb(SnapObjectContext *sctx, bool is_obedit, Object 
*ob, float obmat[4][4], void *data)
+{
+       struct RaycastObjUserData *dt = data;
+       dt->ret |= raycastObj(
+               sctx,
+               dt->ray_orig, dt->ray_start, dt->ray_dir, dt->depth_range,
+               ob, obmat, dt->ob_index, is_obedit,
+               dt->ray_depth,
+               dt->r_loc, dt->r_no, dt->r_index,
+               dt->r_ob, dt->r_obmat,
+               dt->r_hit_list);
+}
+
 /**
  * Main RayCast Function
  * ======================
@@ -808,24 +851,27 @@ static bool raycastObjects(
         Object **r_ob, float r_obmat[4][4],
         ListBase *r_hit_list)
 {
-       bool retval = false;
-       bool use_obedit;
-
-       unsigned int ob_index = 0;
-
-       Object *ob, *obedit;
-       float (*obmat)[4];
+       Object *obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
+
+       struct RaycastObjUserData data = {
+               .ray_orig = ray_orig,
+               .ray_start = ray_start,
+               .ray_dir = ray_dir,
+               .depth_range = depth_range,
+               .ob_index = 0,
+               .ray_depth = ray_depth,
+               .r_loc = r_loc,
+               .r_no = r_no,
+               .r_index = r_index,
+               .r_ob = r_ob,
+               .r_obmat = r_obmat,
+               .r_hit_list = r_hit_list,
+               .ret = false,
+       };
 
-       obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
-       ITER_SNAP_OBJECTS(use_obedit, ob, obmat, sctx, snap_select, obedit,
-               retval |= raycastObj(
-                       sctx,
-                       ray_orig, ray_start, ray_dir, depth_range,
-                       ob, obmat, ob_index++, use_obedit,
-                       ray_depth, r_loc, r_no, r_index, r_ob, r_obmat, 
r_hit_list);
-       )
+       iter_snap_objects(sctx, snap_select, obedit, raycast_obj_cb, &data);
 
-       return retval;
+       return data.ret;
 }
 
 
@@ -1998,6 +2044,33 @@ static bool snapObject(
 }
 
 
+struct SnapObjUserData {
+       SnapData *snapdata;
+       /* read/write args */
+       float *ray_depth;
+       float *dist_px;
+       /* return args */
+       float *r_loc;
+       float *r_no;
+       Object **r_ob;
+       float (*r_obmat)[4];
+       bool ret;
+};
+
+static void sanp_obj_cb(SnapObjectContext *sctx, bool is_obedit, Object *ob, 
float obmat[4][4], void *data)
+{
+       struct SnapObjUserData *dt = data;
+       dt->ret |= snapObject(
+               sctx, dt->snapdata,
+               ob, obmat, is_obedit,
+               /* read/write args */
+               dt->ray_depth, dt->dist_px,
+               /* return args */
+               dt->r_loc, dt->r_no,
+               dt->r_ob, dt->r_obmat);
+}
+
+
 /**
  * Main Snapping Function
  * ======================
@@ -2035,21 +2108,22 @@ static bool snapObjectsRay(
         float r_loc[3], float r_no[3],
         Object **r_ob, float r_obmat[4][4])
 {
-       bool retval = false;
-       bool use_obedit;
-
-       Object *ob, *obedit;
-       float (*obmat)[4];
+       Object *obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
+
+       struct SnapObjUserData data = {
+               .snapdata = snapdata,
+               .ray_depth = ray_depth,
+               .dist_px = dist_px,
+               .r_loc = r_loc,
+               .r_no = r_no,
+               .r_ob = r_ob,
+               .r_obmat = r_obmat,
+               .ret = false,
+       };
 
-       obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
-       ITER_SNAP_OBJECTS(use_obedit, ob, obmat, sctx, snap_select, obedit,
-               retval |= snapObject(
-                       sctx, snapdata, ob, obmat, use_obedit,
-                       ray_depth, dist_px,
-                       r_loc, r_no, r_ob, r_obmat);
-       )
+       iter_snap_objects(sctx, snap_select, obedit, sanp_obj_cb, &data);
 
-       return retval;
+       return data.ret;
 }
 
 /** \} */

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