Game Engine: Level of detail support and tools

Levels of detail can be added and modified in the object panel. The object
panel also contains new tools for generating levels of detail, setting up
levels of detail based on object names (useful for importing), and
clearing an object's level of detail settings. This is meant as a game
engine feature, though the level of details settings can be previewed in
the viewport.

Reviewed By: moguri, nexyon, brecht

Differential Revision: http://developer.blender.org/D109

3 files changed, 26 insertions, 2 deletions

diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 225c58207e7..1e48be2ffab 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -3359,7 +3359,7 @@ static void draw_mesh_object_outline(View3D *v3d, Object *ob, DerivedMesh *dm)
 static void draw_mesh_fancy(Scene *scene, ARegion *ar, View3D *v3d, RegionView3D *rv3d, Base *base,
                             const char dt, const unsigned char ob_wire_col[4], const short dflag)
 {
-	Object *ob = base->object;
+	Object *ob = BKE_object_lod_meshob_get(base->object, scene);
 	Mesh *me = ob->data;
 	Material *ma = give_current_material(ob, 1);
 	const short hasHaloMat = (ma && (ma->material_type == MA_TYPE_HALO) && !BKE_scene_use_new_shading_nodes(scene));
diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 03b89972e55..9125d439432 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -809,6 +809,7 @@ static void view3d_main_area_listener(bScreen *sc, ScrArea *sa, ARegion *ar, wmN
 				case ND_CONSTRAINT:
 				case ND_KEYS:
 				case ND_PARTICLE:
+				case ND_LOD:
 					ED_region_tag_redraw(ar);
 					break;
 			}
diff --git a/source/blender/editors/space_view3d/view3d_draw.c b/source/blender/editors/space_view3d/view3d_draw.c
index 9dd6ab8f841..701fb26a562 100644
--- a/source/blender/editors/space_view3d/view3d_draw.c
+++ b/source/blender/editors/space_view3d/view3d_draw.c
@@ -1956,6 +1956,7 @@ static void draw_dupli_objects_color(Scene *scene, ARegion *ar, View3D *v3d, Bas
 {
 	RegionView3D *rv3d = ar->regiondata;
 	ListBase *lb;
+	LodLevel *savedlod;
 	DupliObject *dob_prev = NULL, *dob, *dob_next = NULL;
 	Base tbase = {NULL};
 	BoundBox bb, *bb_tmp; /* use a copy because draw_object, calls clear_mesh_caches */
@@ -1976,6 +1977,13 @@ static void draw_dupli_objects_color(Scene *scene, ARegion *ar, View3D *v3d, Bas
 	for (; dob; dob_prev = dob, dob = dob_next, dob_next = dob_next ? dupli_step(dob_next->next) : NULL) {
 		tbase.object = dob->ob;
 
+		/* Make sure lod is updated from dupli's position */
+
+		copy_m4_m4(dob->ob->obmat, dob->mat);
+		savedlod = dob->ob->currentlod;
+		BKE_object_lod_update(dob->ob, rv3d->viewinv[3]);
+		
+
 		/* extra service: draw the duplicator in drawtype of parent, minimum taken
 		 * to allow e.g. boundbox box objects in groups for LOD */
 		dt = tbase.object->dt;
@@ -2051,13 +2059,13 @@ static void draw_dupli_objects_color(Scene *scene, ARegion *ar, View3D *v3d, Bas
 			glLoadMatrixf(rv3d->viewmat);
 		}
 		else {
-			copy_m4_m4(dob->ob->obmat, dob->mat);
 			draw_object(scene, ar, v3d, &tbase, DRAW_CONSTCOLOR);
 		}
 
 		tbase.object->dt = dt;
 		tbase.object->dtx = dtx;
 		tbase.object->transflag = transflag;
+		tbase.object->currentlod = savedlod;
 	}
 	
 	/* Transp afterdraw disabled, afterdraw only stores base pointers, and duplis can be same obj */
@@ -3183,6 +3191,18 @@ static void view3d_main_area_clear(Scene *scene, View3D *v3d, ARegion *ar)
 	}
 }
 
+static void update_lods(Scene *scene, float camera_pos[3])
+{
+	Scene *sce_iter;
+	Base *base;
+	Object *ob;
+
+	for (SETLOOPER(scene, sce_iter, base)) {
+		ob = base->object;
+		BKE_object_lod_update(ob, camera_pos);
+	}
+}
+
 /* warning: this function has duplicate drawing in ED_view3d_draw_offscreen() */
 static void view3d_main_area_draw_objects(const bContext *C, ARegion *ar, const char **grid_unit)
 {
@@ -3205,6 +3225,9 @@ static void view3d_main_area_draw_objects(const bContext *C, ARegion *ar, const
 	/* setup view matrices */
 	view3d_main_area_setup_view(scene, v3d, ar, NULL, NULL);
 
+	/* Make sure LoDs are up to date */
+	update_lods(scene, rv3d->viewinv[3]);
+
 	/* clear the background */
 	view3d_main_area_clear(scene, v3d, ar);