Implemented general functions to store view context like viewport width/height

and projection matrix, so operators which depends on such things can easily save
settings in operator properties in invoke and then reuse them in exec callback.

This will fix: #24767: Knife tool last operations panel doesn't cause changes even though F6 pop-up does.
               #27129: Problem with knife cuts/midpoint type in quad view

Usage is pretty simple:
- From operator template declaration function call ED_view3d_operator_properties_viewmat()
  to register all needed properties in operator.
- From invoke callback call ED_view3d_operator_properties_viewmat_set to
  store all needed settings in operator properties().
- To access this settings from exec callback, use function
  ED_view3d_operator_properties_viewmat_get().

Additional change:
added function apply_project_float() which does the same as
project_float() but accepts actual values for viewport width/height and
projection matrix.

1 files changed, 8 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_view3d.h b/source/blender/editors/include/ED_view3d.h
index f087cdc7442..7616e25cbe9 100644
--- a/source/blender/editors/include/ED_view3d.h
+++ b/source/blender/editors/include/ED_view3d.h
@@ -52,7 +52,8 @@ struct View3D;
 struct ViewContext;
 struct wmWindow;
 struct MVert;
-
+struct wmOperatorType;
+struct wmOperator;
 
 /* for derivedmesh drawing callbacks, for view3d_select, .... */
 typedef struct ViewContext {
@@ -209,6 +210,7 @@ void project_short_noclip(struct ARegion *ar, const float vec[3], short adr[2]);
 void project_int(struct ARegion *ar, const float vec[3], int adr[2]);
 void project_int_noclip(struct ARegion *ar, const float vec[3], int adr[2]);
 
+void apply_project_float(float persmat[4][4], int winx, int winy, const float vec[], float adr[2]);
 void project_float(struct ARegion *ar, const float vec[3], float adr[2]);
 void project_float_noclip(struct ARegion *ar, const float vec[3], float adr[2]);
 
@@ -301,4 +303,9 @@ struct BGpic *ED_view3D_background_image_new(struct View3D *v3d);
 void ED_view3D_background_image_remove(struct View3D *v3d, struct BGpic *bgpic);
 void ED_view3D_background_image_clear(struct View3D *v3d);
 
+/* view matrix properties utilities */
+void ED_view3d_operator_properties_viewmat(struct wmOperatorType *ot);
+void ED_view3d_operator_properties_viewmat_set(struct bContext *C, struct wmOperator *op);
+void ED_view3d_operator_properties_viewmat_get(struct wmOperator *op, int *winx, int *winy, float persmat[4][4]);
+
 #endif /* ED_VIEW3D_H */