Transform: Snap used multiple eval contexts

Changes for 2.8x to use EvaluationContext caused some confusion

- Would use scene layer passed from snap context.
- Would generate duplis from Main eval context.
- Would take context argument and use it to create another eval context.

Adding context args all over and filling in a new eval-context
for every ray-cast test isn't ideal either.

Remove the context argument since the purpose of
SnapObjectContext is to avoid this kind of confusion.
Store the EvaluationContext once and re-use.

10 files changed, 77 insertions, 83 deletions

diff --git a/source/blender/editors/armature/editarmature_sketch.c b/source/blender/editors/armature/editarmature_sketch.c
index cb4d863b7b5..7407d12f7d7 100644
--- a/source/blender/editors/armature/editarmature_sketch.c
+++ b/source/blender/editors/armature/editarmature_sketch.c
@@ -1005,7 +1005,7 @@ static int sk_getStrokeSnapPoint(bContext *C, SK_Point *pt, SK_Sketch *sketch, S
 	if (ts->snap_mode == SCE_SNAP_MODE_VOLUME) {
 		float size;
 		if (peelObjectsSnapContext(
-		        C, snap_context, mvalf,
+		        snap_context, mvalf,
 		        &(const struct SnapObjectParams){
 		            .snap_select = SNAP_NOT_SELECTED,
 		            .use_object_edit_cage = false,
@@ -1045,7 +1045,7 @@ static int sk_getStrokeSnapPoint(bContext *C, SK_Point *pt, SK_Sketch *sketch, S
 		/* try to snap to closer object */
 		{
 			if (ED_transform_snap_object_project_view3d(
-			        C, snap_context,
+			        snap_context,
 			        ts->snap_mode,
 			        &(const struct SnapObjectParams){
 			            .snap_select = SNAP_NOT_SELECTED,
diff --git a/source/blender/editors/curve/editcurve.c b/source/blender/editors/curve/editcurve.c
index 76b78e643ff..6327dbb8fae 100644
--- a/source/blender/editors/curve/editcurve.c
+++ b/source/blender/editors/curve/editcurve.c
@@ -5021,7 +5021,7 @@ static int add_vertex_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 			        vc.ar, vc.v3d);
 
 			ED_transform_snap_object_project_view3d_mixed(
-			        C, snap_context,
+			        snap_context,
 			        SCE_SELECT_FACE,
 			        &(const struct SnapObjectParams){
 			            .snap_select = (vc.scene->obedit != NULL) ? SNAP_NOT_ACTIVE : SNAP_ALL,
diff --git a/source/blender/editors/include/ED_transform.h b/source/blender/editors/include/ED_transform.h
index 39dd6024022..483caf7c475 100644
--- a/source/blender/editors/include/ED_transform.h
+++ b/source/blender/editors/include/ED_transform.h
@@ -182,7 +182,7 @@ bool peelObjectsTransform(
         /* return args */
         float r_loc[3], float r_no[3], float *r_thickness);
 bool peelObjectsSnapContext(
-        const struct bContext *C, struct SnapObjectContext *sctx,
+        struct SnapObjectContext *sctx,
         const float mval[2],
         const struct SnapObjectParams *params,
         const bool use_peel_object,
diff --git a/source/blender/editors/include/ED_transform_snap_object_context.h b/source/blender/editors/include/ED_transform_snap_object_context.h
index 4f93c35b8d6..3a042ebfb1d 100644
--- a/source/blender/editors/include/ED_transform_snap_object_context.h
+++ b/source/blender/editors/include/ED_transform_snap_object_context.h
@@ -85,34 +85,34 @@ void ED_transform_snap_object_context_set_editmesh_callbacks(
         void *user_data);
 
 bool ED_transform_snap_object_project_ray_ex(
-        const struct bContext *C, struct SnapObjectContext *sctx,
+        struct SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_start[3], const float ray_normal[3], float *ray_depth,
         /* return args */
         float r_loc[3], float r_no[3], int *r_index,
         struct Object **r_ob, float r_obmat[4][4]);
 bool ED_transform_snap_object_project_ray(
-        const struct bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_origin[3], const float ray_direction[3], float *ray_depth,
         float r_co[3], float r_no[3]);
 
 bool ED_transform_snap_object_project_ray_all(
-        const struct bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_start[3], const float ray_normal[3],
         float ray_depth, bool sort,
         struct ListBase *r_hit_list);
 
 bool ED_transform_snap_object_project_view3d_ex(
-        const struct bContext *C, struct SnapObjectContext *sctx,
+        struct SnapObjectContext *sctx,
         const unsigned short snap_to,
         const struct SnapObjectParams *params,
         const float mval[2], float *dist_px,
         float *ray_depth,
         float r_loc[3], float r_no[3], int *r_index);
 bool ED_transform_snap_object_project_view3d(
-        const struct bContext *C, struct SnapObjectContext *sctx,
+        struct SnapObjectContext *sctx,
         const unsigned short snap_to,
         const struct SnapObjectParams *params,
         const float mval[2], float *dist_px,
@@ -120,7 +120,7 @@ bool ED_transform_snap_object_project_view3d(
         /* return args */
         float r_loc[3], float r_no[3]);
 bool ED_transform_snap_object_project_view3d_mixed(
-        const struct bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const unsigned short snap_to_flag,
         const struct SnapObjectParams *params,
         const float mval_fl[2], float *dist_px,
@@ -128,7 +128,7 @@ bool ED_transform_snap_object_project_view3d_mixed(
         float r_co[3], float r_no[3]);
 
 bool ED_transform_snap_object_project_all_view3d_ex(
-        const struct bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float mval[2],
         float ray_depth, bool sort,
diff --git a/source/blender/editors/mesh/editmesh_tools.c b/source/blender/editors/mesh/editmesh_tools.c
index 023b05db62f..cbed6a37c1f 100644
--- a/source/blender/editors/mesh/editmesh_tools.c
+++ b/source/blender/editors/mesh/editmesh_tools.c
@@ -317,7 +317,7 @@ void EMBM_project_snap_verts(bContext *C, ARegion *ar, BMEditMesh *em)
 			float mval[2], co_proj[3];
 			if (ED_view3d_project_float_object(ar, eve->co, mval, V3D_PROJ_TEST_NOP) == V3D_PROJ_RET_OK) {
 				if (ED_transform_snap_object_project_view3d_mixed(
-				        C, snap_context,
+				        snap_context,
 				        SCE_SELECT_FACE,
 				        &(const struct SnapObjectParams){
 				            .snap_select = SNAP_NOT_ACTIVE,
diff --git a/source/blender/editors/space_view3d/view3d_ruler.c b/source/blender/editors/space_view3d/view3d_ruler.c
index acf8ed29c6b..f62a12b071f 100644
--- a/source/blender/editors/space_view3d/view3d_ruler.c
+++ b/source/blender/editors/space_view3d/view3d_ruler.c
@@ -738,7 +738,7 @@ static void view3d_ruler_item_project(RulerInfo *ruler_info, float r_co[3],
 
 /* use for mousemove events */
 static bool view3d_ruler_item_mousemove(
-        const bContext *C, RulerInfo *ruler_info, const int mval[2],
+        RulerInfo *ruler_info, const int mval[2],
         const bool do_thickness, const bool do_snap)
 {
 	const float eps_bias = 0.0002f;
@@ -763,7 +763,7 @@ static bool view3d_ruler_item_mousemove(
 			co_other = ruler_item->co[ruler_item->co_index == 0 ? 2 : 0];
 
 			if (ED_transform_snap_object_project_view3d_mixed(
-			        C, ruler_info->snap_context,
+			        ruler_info->snap_context,
 			        SCE_SELECT_FACE,
 			        &(const struct SnapObjectParams){
 			            .snap_select = SNAP_ALL,
@@ -776,7 +776,7 @@ static bool view3d_ruler_item_mousemove(
 				/* add some bias */
 				madd_v3_v3v3fl(ray_start, co, ray_normal, eps_bias);
 				ED_transform_snap_object_project_ray(
-				        C, ruler_info->snap_context,
+				        ruler_info->snap_context,
 				        &(const struct SnapObjectParams){
 				            .snap_select = SNAP_ALL,
 				            .use_object_edit_cage = true,
@@ -792,7 +792,7 @@ static bool view3d_ruler_item_mousemove(
 			bool use_depth = (v3d->drawtype >= OB_SOLID);
 
 			if (ED_transform_snap_object_project_view3d_mixed(
-			        C, ruler_info->snap_context,
+			        ruler_info->snap_context,
 			        (SCE_SELECT_VERTEX | SCE_SELECT_EDGE) | (use_depth ? SCE_SELECT_FACE : 0),
 			        &(const struct SnapObjectParams){
 			            .snap_select = SNAP_ALL,
@@ -924,7 +924,7 @@ static int view3d_ruler_modal(bContext *C, wmOperator *op, const wmEvent *event)
 						if (use_depth) {
 							/* snap the first point added, not essential but handy */
 							ruler_item->co_index = 0;
-							view3d_ruler_item_mousemove(C, ruler_info, event->mval, false, true);
+							view3d_ruler_item_mousemove(ruler_info, event->mval, false, true);
 							copy_v3_v3(ruler_info->drag_start_co, ruler_item->co[ruler_item->co_index]);
 						}
 						else {
@@ -977,7 +977,7 @@ static int view3d_ruler_modal(bContext *C, wmOperator *op, const wmEvent *event)
 									}
 
 									/* update the new location */
-									view3d_ruler_item_mousemove(C, ruler_info, event->mval,
+									view3d_ruler_item_mousemove(ruler_info, event->mval,
 									                            event->shift != 0, event->ctrl != 0);
 									do_draw = true;
 								}
@@ -1026,7 +1026,7 @@ static int view3d_ruler_modal(bContext *C, wmOperator *op, const wmEvent *event)
 		case MOUSEMOVE:
 		{
 			if (ruler_info->state == RULER_STATE_DRAG) {
-				if (view3d_ruler_item_mousemove(C, ruler_info, event->mval,
+				if (view3d_ruler_item_mousemove(ruler_info, event->mval,
 				                                event->shift != 0, event->ctrl != 0))
 				{
 					do_draw = true;
diff --git a/source/blender/editors/space_view3d/view3d_walk.c b/source/blender/editors/space_view3d/view3d_walk.c
index 4ff084129c3..d4642edf084 100644
--- a/source/blender/editors/space_view3d/view3d_walk.c
+++ b/source/blender/editors/space_view3d/view3d_walk.c
@@ -423,7 +423,7 @@ static void walk_navigation_mode_set(bContext *C, wmOperator *op, WalkInfo *walk
  * \param r_distance  Distance to the hit point
  */
 static bool walk_floor_distance_get(
-        const bContext *C, RegionView3D *rv3d, WalkInfo *walk, const float dvec[3],
+        RegionView3D *rv3d, WalkInfo *walk, const float dvec[3],
         float *r_distance)
 {
 	float ray_normal[3] = {0, 0, -1}; /* down */
@@ -441,7 +441,7 @@ static bool walk_floor_distance_get(
 	add_v3_v3(ray_start, dvec_tmp);
 
 	ret = ED_transform_snap_object_project_ray(
-	        C, walk->snap_context,
+	        walk->snap_context,
 	        &(const struct SnapObjectParams){
 	            .snap_select = SNAP_ALL,
 	        },
@@ -459,7 +459,7 @@ static bool walk_floor_distance_get(
  * \param r_normal  Normal of the hit surface, transformed to always face the camera
  */
 static bool walk_ray_cast(
-        const bContext *C, RegionView3D *rv3d, WalkInfo *walk,
+        RegionView3D *rv3d, WalkInfo *walk,
         float r_location[3], float r_normal[3], float *ray_distance)
 {
 	float ray_normal[3] = {0, 0, -1}; /* forward */
@@ -475,7 +475,7 @@ static bool walk_ray_cast(
 	normalize_v3(ray_normal);
 
 	ret = ED_transform_snap_object_project_ray(
-	        C, walk->snap_context,
+	        walk->snap_context,
 	        &(const struct SnapObjectParams){
 	            .snap_select = SNAP_ALL,
 	        },
@@ -921,7 +921,7 @@ static void walkEvent(bContext *C, wmOperator *op, WalkInfo *walk, const wmEvent
 			{
 				float loc[3], nor[3];
 				float distance;
-				bool ret = walk_ray_cast(C, walk->rv3d, walk, loc, nor, &distance);
+				bool ret = walk_ray_cast(walk->rv3d, walk, loc, nor, &distance);
 
 				/* in case we are teleporting middle way from a jump */
 				walk->speed_jump = 0.0f;
@@ -1201,7 +1201,7 @@ static int walkApply(bContext *C, wmOperator *op, WalkInfo *walk)
 				float difference = -100.0f;
 				float fall_distance;
 
-				ret = walk_floor_distance_get(C, rv3d, walk, dvec, &ray_distance);
+				ret = walk_floor_distance_get(rv3d, walk, dvec, &ray_distance);
 
 				if (ret) {
 					difference = walk->view_height - ray_distance;
@@ -1254,7 +1254,7 @@ static int walkApply(bContext *C, wmOperator *op, WalkInfo *walk)
 				if (t > walk->teleport.duration) {
 
 					/* check to see if we are landing */
-					ret = walk_floor_distance_get(C, rv3d, walk, dvec, &ray_distance);
+					ret = walk_floor_distance_get(rv3d, walk, dvec, &ray_distance);
 
 					if (ret) {
 						difference = walk->view_height - ray_distance;
diff --git a/source/blender/editors/transform/transform_snap.c b/source/blender/editors/transform/transform_snap.c
index 906a6ce20ef..1181f584313 100644
--- a/source/blender/editors/transform/transform_snap.c
+++ b/source/blender/editors/transform/transform_snap.c
@@ -1197,7 +1197,7 @@ bool snapObjectsTransform(
         float r_loc[3], float r_no[3])
 {
 	return ED_transform_snap_object_project_view3d_ex(
-	        t->context, t->tsnap.object_context,
+	        t->tsnap.object_context,
 	        t->scene->toolsettings->snap_mode,
 	        &(const struct SnapObjectParams){
 	            .snap_select = t->tsnap.modeSelect,
@@ -1211,7 +1211,7 @@ bool snapObjectsTransform(
 /******************** PEELING *********************************/
 
 bool peelObjectsSnapContext(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const float mval[2],
         const struct SnapObjectParams *params,
         const bool use_peel_object,
@@ -1220,7 +1220,7 @@ bool peelObjectsSnapContext(
 {
 	ListBase depths_peel = {0};
 	ED_transform_snap_object_project_all_view3d_ex(
-	        C, sctx,
+	        sctx,
 	        params,
 	        mval, -1.0f, false,
 	        &depths_peel);
@@ -1287,7 +1287,7 @@ bool peelObjectsTransform(
         float r_loc[3], float r_no[3], float *r_thickness)
 {
 	return peelObjectsSnapContext(
-	        t->context, t->tsnap.object_context,
+	        t->tsnap.object_context,
 	        mval,
 	        &(const struct SnapObjectParams){
 	            .snap_select = t->tsnap.modeSelect,
diff --git a/source/blender/editors/transform/transform_snap_object.c b/source/blender/editors/transform/transform_snap_object.c
index ae4190026f8..d9dd4707ff6 100644
--- a/source/blender/editors/transform/transform_snap_object.c
+++ b/source/blender/editors/transform/transform_snap_object.c
@@ -104,7 +104,8 @@ typedef struct SnapObjectData_EditMesh {
 struct SnapObjectContext {
 	Main *bmain;
 	Scene *scene;
-	SceneLayer *scene_layer;
+	EvaluationContext eval_ctx;
+
 	int flag;
 
 	/* Optional: when performing screen-space projection.
@@ -143,7 +144,7 @@ struct SnapObjectContext {
 * \{ */
 
 
-typedef void(*IterSnapObjsCallback)(const bContext *C, SnapObjectContext *sctx, bool is_obedit, Object *ob, float obmat[4][4], void *data);
+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.
@@ -153,24 +154,23 @@ typedef void(*IterSnapObjsCallback)(const bContext *C, SnapObjectContext *sctx,
  * \param obedit : Object Edited to use its coordinates of BMesh(if any) to do the snapping.
  */
 static void iter_snap_objects(
-        const bContext *C,
         SnapObjectContext *sctx,
         const SnapSelect snap_select,
         Object *obedit,
         IterSnapObjsCallback sob_callback,
         void *data)
 {
-	Base *base_act = sctx->scene_layer->basact;
+	Base *base_act = sctx->eval_ctx.scene_layer->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(C, sctx, false, base_act->object, base_act->object->obmat, data);
+		sob_callback(sctx, false, base_act->object, base_act->object->obmat, data);
 	}
 
-	for (Base *base = sctx->scene_layer->object_bases.first; base != NULL; base = base->next) {
+	for (Base *base = sctx->eval_ctx.scene_layer->object_bases.first; base != NULL; base = base->next) {
 		if ((BASE_VISIBLE_NEW(base)) && (base->flag_legacy & (BA_HAS_RECALC_OB | BA_HAS_RECALC_DATA)) == 0 &&
 		    !((snap_select == SNAP_NOT_SELECTED && ((base->flag & BASE_SELECTED) || (base->flag_legacy & BA_WAS_SEL))) ||
 		      (snap_select == SNAP_NOT_ACTIVE && base == base_act)))
@@ -179,16 +179,16 @@ static void iter_snap_objects(
 			Object *obj = base->object;
 			if (obj->transflag & OB_DUPLI) {
 				DupliObject *dupli_ob;
-				ListBase *lb = object_duplilist(sctx->bmain->eval_ctx, sctx->scene, obj);
+				ListBase *lb = object_duplilist(&sctx->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(C, sctx, use_obedit, use_obedit ? obedit : dupli_ob->ob, dupli_ob->mat, 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(C, sctx, use_obedit, use_obedit ? obedit : obj, obj->obmat, data);
+			sob_callback(sctx, use_obedit, use_obedit ? obedit : obj, obj->obmat, data);
 		}
 	}
 }
@@ -711,7 +711,7 @@ static bool raycastEditMesh(
  * \note Duplicate args here are documented at #snapObjectsRay
  */
 static bool raycastObj(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const float ray_start[3], const float ray_dir[3],
         Object *ob, float obmat[4][4], const unsigned int ob_index,
         bool use_obedit,
@@ -722,11 +722,8 @@ static bool raycastObj(
         Object **r_ob, float r_obmat[4][4],
         ListBase *r_hit_list)
 {
-	EvaluationContext eval_ctx;
 	bool retval = false;
 
-	CTX_data_eval_ctx(C, &eval_ctx);
-
 	if (ob->type == OB_MESH) {
 		BMEditMesh *em;
 
@@ -744,10 +741,10 @@ static bool raycastObj(
 			DerivedMesh *dm;
 			em = BKE_editmesh_from_object(ob);
 			if (em) {
-				editbmesh_get_derived_cage_and_final(&eval_ctx, sctx->scene, ob, em, CD_MASK_BAREMESH, &dm);
+				editbmesh_get_derived_cage_and_final(&sctx->eval_ctx, sctx->scene, ob, em, CD_MASK_BAREMESH, &dm);
 			}
 			else {
-				dm = mesh_get_derived_final(&eval_ctx, sctx->scene, ob, CD_MASK_BAREMESH);
+				dm = mesh_get_derived_final(&sctx->eval_ctx, sctx->scene, ob, CD_MASK_BAREMESH);
 			}
 			retval = raycastDerivedMesh(
 			        sctx,
@@ -786,11 +783,11 @@ struct RaycastObjUserData {
 	bool ret;
 };
 
-static void raycast_obj_cb(const bContext *C, SnapObjectContext *sctx, bool is_obedit, Object *ob, float obmat[4][4], void *data)
+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(
-	        C, sctx,
+	        sctx,
 	        dt->ray_start, dt->ray_dir,
 	        ob, obmat, dt->ob_index++, is_obedit,
 	        dt->ray_depth,
@@ -829,7 +826,7 @@ static void raycast_obj_cb(const bContext *C, SnapObjectContext *sctx, bool is_o
  *
  */
 static bool raycastObjects(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const float ray_start[3], const float ray_dir[3],
         const SnapSelect snap_select, const bool use_object_edit_cage,
         /* read/write args */
@@ -855,7 +852,7 @@ static bool raycastObjects(
 		.ret = false,
 	};
 
-	iter_snap_objects(C, sctx, snap_select, obedit, raycast_obj_cb, &data);
+	iter_snap_objects(sctx, snap_select, obedit, raycast_obj_cb, &data);
 
 	return data.ret;
 }
@@ -1948,7 +1945,7 @@ static bool snapEditMesh(
  * \note Duplicate args here are documented at #snapObjectsRay
  */
 static bool snapObject(
-        const bContext *C, SnapObjectContext *sctx, SnapData *snapdata,
+        SnapObjectContext *sctx, SnapData *snapdata,
         Object *ob, float obmat[4][4],
         bool use_obedit,
         /* read/write args */
@@ -1957,11 +1954,8 @@ static bool snapObject(
         float r_loc[3], float r_no[3],
         Object **r_ob, float r_obmat[4][4])
 {
-	EvaluationContext eval_ctx;
 	bool retval = false;
 
-	CTX_data_eval_ctx(C, &eval_ctx);
-
 	if (ob->type == OB_MESH) {
 		BMEditMesh *em;
 
@@ -1978,10 +1972,10 @@ static bool snapObject(
 			DerivedMesh *dm;
 			em = BKE_editmesh_from_object(ob);
 			if (em) {
-				editbmesh_get_derived_cage_and_final(&eval_ctx, sctx->scene, ob, em, CD_MASK_BAREMESH, &dm);
+				editbmesh_get_derived_cage_and_final(&sctx->eval_ctx, sctx->scene, ob, em, CD_MASK_BAREMESH, &dm);
 			}
 			else {
-				dm = mesh_get_derived_final(&eval_ctx, sctx->scene, ob, CD_MASK_BAREMESH);
+				dm = mesh_get_derived_final(&sctx->eval_ctx, sctx->scene, ob, CD_MASK_BAREMESH);
 			}
 			retval = snapDerivedMesh(
 			        sctx, snapdata, ob, dm, obmat,
@@ -2045,11 +2039,11 @@ struct SnapObjUserData {
 	bool ret;
 };
 
-static void sanp_obj_cb(const bContext *C, SnapObjectContext *sctx, bool is_obedit, Object *ob, float obmat[4][4], void *data)
+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(
-	        C, sctx, dt->snapdata,
+	        sctx, dt->snapdata,
 	        ob, obmat, is_obedit,
 	        /* read/write args */
 	        dt->ray_depth, dt->dist_px,
@@ -2088,7 +2082,7 @@ static void sanp_obj_cb(const bContext *C, SnapObjectContext *sctx, bool is_obed
  *
  */
 static bool snapObjectsRay(
-        const bContext *C, SnapObjectContext *sctx, SnapData *snapdata,
+        SnapObjectContext *sctx, SnapData *snapdata,
         const SnapSelect snap_select, const bool use_object_edit_cage,
         /* read/write args */
         float *ray_depth, float *dist_px,
@@ -2109,7 +2103,7 @@ static bool snapObjectsRay(
 		.ret = false,
 	};
 
-	iter_snap_objects(C, sctx, snap_select, obedit, sanp_obj_cb, &data);
+	iter_snap_objects(sctx, snap_select, obedit, sanp_obj_cb, &data);
 
 	return data.ret;
 }
@@ -2131,7 +2125,8 @@ SnapObjectContext *ED_transform_snap_object_context_create(
 
 	sctx->bmain = bmain;
 	sctx->scene = scene;
-	sctx->scene_layer = sl;
+
+	DEG_evaluation_context_init_from_scene(&sctx->eval_ctx, scene, sl, DAG_EVAL_VIEWPORT);
 
 	sctx->cache.object_map = BLI_ghash_ptr_new(__func__);
 	sctx->cache.mem_arena = BLI_memarena_new(BLI_MEMARENA_STD_BUFSIZE, __func__);
@@ -2205,7 +2200,7 @@ void ED_transform_snap_object_context_set_editmesh_callbacks(
 }
 
 bool ED_transform_snap_object_project_ray_ex(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_start[3], const float ray_normal[3],
         float *ray_depth,
@@ -2213,7 +2208,7 @@ bool ED_transform_snap_object_project_ray_ex(
         Object **r_ob, float r_obmat[4][4])
 {
 	return raycastObjects(
-	        C, sctx,
+	        sctx,
 	        ray_start, ray_normal,
 	        params->snap_select, params->use_object_edit_cage,
 	        ray_depth, r_loc, r_no, r_index, r_ob, r_obmat, NULL);
@@ -2227,7 +2222,7 @@ bool ED_transform_snap_object_project_ray_ex(
  * \param r_hit_list: List of #SnapObjectHitDepth (caller must free).
  */
 bool ED_transform_snap_object_project_ray_all(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_start[3], const float ray_normal[3],
         float ray_depth, bool sort,
@@ -2242,7 +2237,7 @@ bool ED_transform_snap_object_project_ray_all(
 #endif
 
 	bool retval = raycastObjects(
-	        C, sctx,
+	        sctx,
 	        ray_start, ray_normal,
 	        params->snap_select, params->use_object_edit_cage,
 	        &ray_depth, NULL, NULL, NULL, NULL, NULL,
@@ -2268,7 +2263,7 @@ bool ED_transform_snap_object_project_ray_all(
  * \return Snap success
  */
 static bool transform_snap_context_project_ray_impl(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_start[3], const float ray_normal[3], float *ray_depth,
         float r_co[3], float r_no[3])
@@ -2277,7 +2272,7 @@ static bool transform_snap_context_project_ray_impl(
 
 	/* try snap edge, then face if it fails */
 	ret = ED_transform_snap_object_project_ray_ex(
-	        C, sctx,
+	        sctx,
 	        params,
 	        ray_start, ray_normal, ray_depth,
 	        r_co, r_no, NULL,
@@ -2287,7 +2282,7 @@ static bool transform_snap_context_project_ray_impl(
 }
 
 bool ED_transform_snap_object_project_ray(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float ray_origin[3], const float ray_direction[3], float *ray_depth,
         float r_co[3], float r_no[3])
@@ -2299,14 +2294,14 @@ bool ED_transform_snap_object_project_ray(
 	}
 
 	return transform_snap_context_project_ray_impl(
-	        C, sctx,
+	        sctx,
 	        params,
 	        ray_origin, ray_direction, ray_depth,
 	        r_co, r_no);
 }
 
 static bool transform_snap_context_project_view3d_mixed_impl(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const unsigned short snap_to_flag,
         const struct SnapObjectParams *params,
         const float mval[2], float *dist_px,
@@ -2330,7 +2325,7 @@ static bool transform_snap_context_project_view3d_mixed_impl(
 					*dist_px = dist_px_orig;
 				}
 				if (ED_transform_snap_object_project_view3d(
-				        C, sctx,
+				        sctx,
 				        elem_type[i], params,
 				        mval, dist_px, &ray_depth,
 				        r_co, r_no))
@@ -2347,7 +2342,7 @@ static bool transform_snap_context_project_view3d_mixed_impl(
 		for (int i = 0; i < 3; i++) {
 			if (snap_to_flag & (1 << i)) {
 				if (ED_transform_snap_object_project_view3d(
-				        C, sctx,
+				        sctx,
 				        elem_type[i], params,
 				        mval, dist_px, &ray_depth,
 				        r_co, r_no))
@@ -2376,7 +2371,7 @@ static bool transform_snap_context_project_view3d_mixed_impl(
  * \return Snap success
  */
 bool ED_transform_snap_object_project_view3d_mixed(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const unsigned short snap_to_flag,
         const struct SnapObjectParams *params,
         const float mval_fl[2], float *dist_px,
@@ -2384,14 +2379,14 @@ bool ED_transform_snap_object_project_view3d_mixed(
         float r_co[3], float r_no[3])
 {
 	return transform_snap_context_project_view3d_mixed_impl(
-	        C, sctx,
+	        sctx,
 	        snap_to_flag, params,
 	        mval_fl, dist_px, use_depth,
 	        r_co, r_no);
 }
 
 bool ED_transform_snap_object_project_view3d_ex(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const unsigned short snap_to,
         const struct SnapObjectParams *params,
         const float mval[2], float *dist_px,
@@ -2425,7 +2420,7 @@ bool ED_transform_snap_object_project_view3d_ex(
 
 	if (snap_to == SCE_SNAP_MODE_FACE) {
 		return raycastObjects(
-		        C, sctx,
+		        sctx,
 		        ray_start, ray_normal,
 		        params->snap_select, params->use_object_edit_cage,
 		        ray_depth, r_loc, r_no, r_index, NULL, NULL, NULL);
@@ -2437,14 +2432,14 @@ bool ED_transform_snap_object_project_view3d_ex(
 		        ray_origin, ray_start, ray_normal, depth_range);
 
 		return snapObjectsRay(
-		        C, sctx, &snapdata,
+		        sctx, &snapdata,
 		        params->snap_select, params->use_object_edit_cage,
 		        ray_depth, dist_px, r_loc, r_no, NULL, NULL);
 	}
 }
 
 bool ED_transform_snap_object_project_view3d(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const unsigned short snap_to,
         const struct SnapObjectParams *params,
         const float mval[2], float *dist_px,
@@ -2452,7 +2447,7 @@ bool ED_transform_snap_object_project_view3d(
         float r_loc[3], float r_no[3])
 {
 	return ED_transform_snap_object_project_view3d_ex(
-	        C, sctx,
+	        sctx,
 	        snap_to,
 	        params,
 	        mval, dist_px,
@@ -2464,7 +2459,7 @@ bool ED_transform_snap_object_project_view3d(
  * see: #ED_transform_snap_object_project_ray_all
  */
 bool ED_transform_snap_object_project_all_view3d_ex(
-        const bContext *C, SnapObjectContext *sctx,
+        SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
         const float mval[2],
         float ray_depth, bool sort,
@@ -2480,7 +2475,7 @@ bool ED_transform_snap_object_project_all_view3d_ex(
 	}
 
 	return ED_transform_snap_object_project_ray_all(
-	        C, sctx,
+	        sctx,
 	        params,
 	        ray_start, ray_normal, ray_depth, sort,
 	        r_hit_list);
diff --git a/source/blender/makesrna/intern/rna_scene_api.c b/source/blender/makesrna/intern/rna_scene_api.c
index ff870ec40b7..a1ef3f17bd6 100644
--- a/source/blender/makesrna/intern/rna_scene_api.c
+++ b/source/blender/makesrna/intern/rna_scene_api.c
@@ -151,7 +151,7 @@ static void rna_SceneRender_get_frame_path(RenderData *rd, int frame, int previe
 }
 
 static void rna_Scene_ray_cast(
-        Scene *scene, bContext *C, SceneLayer *sl, float origin[3], float direction[3], float ray_dist,
+        Scene *scene, SceneLayer *sl, float origin[3], float direction[3], float ray_dist,
         int *r_success, float r_location[3], float r_normal[3], int *r_index,
         Object **r_ob, float r_obmat[16])
 {
@@ -161,7 +161,7 @@ static void rna_Scene_ray_cast(
 	        G.main, scene, sl, 0);
 
 	bool ret = ED_transform_snap_object_project_ray_ex(
-	        C, sctx,
+	        sctx,
 	        &(const struct SnapObjectParams){
 	            .snap_select = SNAP_ALL,
 	        },
@@ -352,7 +352,6 @@ void RNA_api_scene(StructRNA *srna)
 	/* Ray Cast */
 	func = RNA_def_function(srna, "ray_cast", "rna_Scene_ray_cast");
 	RNA_def_function_ui_description(func, "Cast a ray onto in object space");
-	RNA_def_function_flag(func, FUNC_USE_CONTEXT);
 	parm = RNA_def_pointer(func, "scene_layer", "SceneLayer", "", "Scene Layer");
 	RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED);
 	/* ray start and end */