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

7 files changed, 136 insertions, 2 deletions

diff --git a/source/blender/editors/object/CMakeLists.txt b/source/blender/editors/object/CMakeLists.txt
index 143a33c3fdd..ecc967d5662 100644
--- a/source/blender/editors/object/CMakeLists.txt
+++ b/source/blender/editors/object/CMakeLists.txt
@@ -47,6 +47,7 @@ set(SRC
 	object_group.c
 	object_hook.c
 	object_lattice.c
+	object_lod.c
 	object_modifier.c
 	object_ops.c
 	object_relations.c
diff --git a/source/blender/editors/object/object_intern.h b/source/blender/editors/object/object_intern.h
index 536f3f05ab2..8b0ddbbeb9b 100644
--- a/source/blender/editors/object/object_intern.h
+++ b/source/blender/editors/object/object_intern.h
@@ -255,5 +255,9 @@ void OBJECT_OT_group_remove(struct wmOperatorType *ot);
 /* object_bake.c */
 void OBJECT_OT_bake_image(wmOperatorType *ot);
 
+/* object_lod.c */
+void OBJECT_OT_lod_add(struct wmOperatorType *ot);
+void OBJECT_OT_lod_remove(struct wmOperatorType *ot);
+
 #endif /* __OBJECT_INTERN_H__ */
 
diff --git a/source/blender/editors/object/object_lod.c b/source/blender/editors/object/object_lod.c
new file mode 100644
index 00000000000..952451ee21d
--- /dev/null
+++ b/source/blender/editors/object/object_lod.c
@@ -0,0 +1,102 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) Blender Foundation
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/editors/object/object_lod.c
+ *  \ingroup edobj
+ */
+
+
+#include "DNA_object_types.h"
+
+#include "BKE_context.h"
+#include "BKE_main.h"
+#include "BKE_object.h"
+
+#include "ED_screen.h"
+#include "ED_object.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "RNA_access.h"
+#include "RNA_define.h"
+#include "RNA_enum_types.h"
+
+#include "object_intern.h"
+
+static int object_lod_add_exec(bContext *C, wmOperator *op)
+{
+	Object *ob = ED_object_context(C);
+	BKE_object_lod_add(ob);
+	return OPERATOR_FINISHED;
+}
+
+void OBJECT_OT_lod_add(wmOperatorType *ot)
+{
+	PropertyRNA *prop;
+
+	/* identifiers */
+	ot->name = "Add Level of Detail";
+	ot->description = "Add a level of detail to this object";
+	ot->idname = "OBJECT_OT_lod_add";
+
+	/* api callbacks */
+	ot->exec = object_lod_add_exec;
+	ot->poll = ED_operator_objectmode;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
+static int object_lod_remove_exec(bContext *C, wmOperator *op)
+{
+	Object *ob = ED_object_context(C);
+	int index = RNA_int_get(op->ptr, "index");
+	if(!BKE_object_lod_remove(ob, index))
+		return OPERATOR_CANCELLED;
+
+	WM_event_add_notifier(C, NC_OBJECT|ND_LOD, CTX_wm_view3d(C));
+	return OPERATOR_FINISHED;
+}
+
+void OBJECT_OT_lod_remove(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name = "Remove Level of Detail";
+	ot->description = "Remove a level of detail from this object";
+	ot->idname = "OBJECT_OT_lod_remove";
+
+	/* api callbacks */
+	ot->exec = object_lod_remove_exec;
+	ot->poll = ED_operator_objectmode;
+
+	/* flags */
+	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+	/* properties */
+	ot->prop = RNA_def_int(ot->srna, "index", 1, 1, INT_MAX, "Index", "", 1, INT_MAX);
+}
\ No newline at end of file
diff --git a/source/blender/editors/object/object_ops.c b/source/blender/editors/object/object_ops.c
index efebbe8ddd7..a06a6d9781f 100644
--- a/source/blender/editors/object/object_ops.c
+++ b/source/blender/editors/object/object_ops.c
@@ -243,6 +243,9 @@ void ED_operatortypes_object(void)
 	WM_operatortype_append(OBJECT_OT_bake_image);
 	WM_operatortype_append(OBJECT_OT_drop_named_material);
 	WM_operatortype_append(OBJECT_OT_laplaciandeform_bind);
+
+	WM_operatortype_append(OBJECT_OT_lod_add);
+	WM_operatortype_append(OBJECT_OT_lod_remove);
 }
 
 void ED_operatormacros_object(void)
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);