Workbench: Optimize Shadows.

This makes the shadows ~10 times faster in the general case.

This only create extrusion geometry on the outline edges. Also we increment
or decrement the stencil buffer by 2 for each manifold edge and only by 1
for non manifold. This make the algorithm robust yet less heavy than creating
one prism for each triangles.

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index 96a6a616072..3197ba799be 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -501,6 +501,19 @@ Gwn_Batch *DRW_cache_object_wire_outline_get(Object *ob)
 	}
 }
 
+/* Returns a buffer texture. */
+Gwn_Batch *DRW_cache_object_edge_detection_get(Object *ob)
+{
+	switch (ob->type) {
+		case OB_MESH:
+			return DRW_cache_mesh_edge_detection_get(ob);
+
+		/* TODO, should match 'DRW_cache_object_surface_get' */
+		default:
+			return NULL;
+	}
+}
+
 Gwn_Batch *DRW_cache_object_surface_get(Object *ob)
 {
 	switch (ob->type) {
@@ -2493,6 +2506,14 @@ Gwn_Batch *DRW_cache_mesh_wire_outline_get(Object *ob)
 	return DRW_mesh_batch_cache_get_fancy_edges(me);
 }
 
+Gwn_Batch *DRW_cache_mesh_edge_detection_get(Object *ob)
+{
+	BLI_assert(ob->type == OB_MESH);
+
+	Mesh *me = ob->data;
+	return DRW_mesh_batch_cache_get_edge_detection(me);
+}
+
 Gwn_Batch *DRW_cache_mesh_surface_get(Object *ob)
 {
 	BLI_assert(ob->type == OB_MESH);