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, 59 insertions, 8 deletions

diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index f57d8a5ec1b..05e8cb45611 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -68,6 +68,9 @@
 #include "BL_System.h"
 #endif
 
+#include "RNA_access.h"
+#include "RNA_define.h"
+
 #include "view3d_intern.h"	// own include
 
 /* use this call when executing an operator,
@@ -947,23 +950,30 @@ void project_short_noclip(ARegion *ar, const float vec[3], short adr[2])
 	}
 }
 
-void project_float(ARegion *ar, const float vec[3], float adr[2])
+void apply_project_float(float persmat[4][4], int winx, int winy, const float vec[3], float adr[2])
 {
-	RegionView3D *rv3d= ar->regiondata;
 	float vec4[4];
-	
+
 	copy_v3_v3(vec4, vec);
 	vec4[3]= 1.0;
 	adr[0]= IS_CLIPPED;
-	
-	mul_m4_v4(rv3d->persmat, vec4);
-	
+
+	mul_m4_v4(persmat, vec4);
+
 	if(vec4[3] > (float)BL_NEAR_CLIP) {
-		adr[0] = (float)(ar->winx/2.0f)+(ar->winx/2.0f)*vec4[0]/vec4[3];
-		adr[1] = (float)(ar->winy/2.0f)+(ar->winy/2.0f)*vec4[1]/vec4[3];
+		adr[0] = (float)(winx/2.0f)+(winx/2.0f)*vec4[0]/vec4[3];
+		adr[1] = (float)(winy/2.0f)+(winy/2.0f)*vec4[1]/vec4[3];
 	}
 }
 
+void project_float(ARegion *ar, const float vec[3], float adr[2])
+{
+	RegionView3D *rv3d= ar->regiondata;
+	float vec4[4];
+
+	apply_project_float(rv3d->persmat, ar->winx, ar->winy, vec, adr);
+}
+
 void project_float_noclip(ARegion *ar, const float vec[3], float adr[2])
 {
 	RegionView3D *rv3d= ar->regiondata;
@@ -1854,3 +1864,44 @@ float ED_view3d_pixel_size(struct RegionView3D *rv3d, const float co[3])
 				rv3d->persmat[2][3]*co[2])
 			) * rv3d->pixsize;
 }
+
+/* view matrix properties utilities */
+
+void ED_view3d_operator_properties_viewmat(wmOperatorType *ot)
+{
+	PropertyRNA *prop;
+
+	prop = RNA_def_int(ot->srna, "region_width", 0, 0, INT_MAX, "Region Width", "", 0, INT_MAX);
+	RNA_def_property_flag(prop, PROP_HIDDEN);
+
+	prop = RNA_def_int(ot->srna, "region_height", 0, 0, INT_MAX, "Region height", "", 0, INT_MAX);
+	RNA_def_property_flag(prop, PROP_HIDDEN);
+
+	prop = RNA_def_float_matrix(ot->srna, "perspective_matrix", 4, 4, NULL, 0.0f, 0.0f, "", "Perspective Matrix", 0.0f, 0.0f);
+	RNA_def_property_flag(prop, PROP_HIDDEN);
+}
+
+void ED_view3d_operator_properties_viewmat_set(bContext *C, wmOperator *op)
+{
+	ARegion *ar= CTX_wm_region(C);
+	RegionView3D *rv3d= ED_view3d_context_rv3d(C);
+
+	if(!RNA_struct_property_is_set(op->ptr, "region_width"))
+		RNA_int_set(op->ptr, "region_width", ar->winx);
+
+	if(!RNA_struct_property_is_set(op->ptr, "region_height"))
+		RNA_int_set(op->ptr, "region_height", ar->winy);
+
+	if(!RNA_struct_property_is_set(op->ptr, "perspective_matrix"))
+		RNA_float_set_array(op->ptr, "perspective_matrix", (float *)rv3d->persmat);
+}
+
+void ED_view3d_operator_properties_viewmat_get(wmOperator *op, int *winx, int *winy, float persmat[4][4])
+{
+	float values[16];
+
+	*winx = RNA_int_get(op->ptr, "region_width");
+	*winy = RNA_int_get(op->ptr, "region_height");
+
+	RNA_float_get_array(op->ptr, "perspective_matrix", (float *)persmat);
+}