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, 2 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache.h b/source/blender/draw/intern/draw_cache.h
index b9a569b3ace..8bc609ffe1f 100644
--- a/source/blender/draw/intern/draw_cache.h
+++ b/source/blender/draw/intern/draw_cache.h
@@ -48,6 +48,7 @@ struct Gwn_Batch *DRW_cache_screenspace_circle_get(void);
 
 /* Common Object */
 struct Gwn_Batch *DRW_cache_object_wire_outline_get(struct Object *ob);
+struct Gwn_Batch *DRW_cache_object_edge_detection_get(struct Object *ob);
 struct Gwn_Batch *DRW_cache_object_surface_get(struct Object *ob);
 struct Gwn_Batch **DRW_cache_object_surface_material_get(
         struct Object *ob, struct GPUMaterial **gpumat_array, uint gpumat_array_len,
@@ -116,6 +117,7 @@ void DRW_cache_mesh_normals_overlay_get(
         struct Gwn_Batch **r_tris, struct Gwn_Batch **r_ledges, struct Gwn_Batch **r_lverts);
 struct Gwn_Batch *DRW_cache_face_centers_get(struct Object *ob);
 struct Gwn_Batch *DRW_cache_mesh_wire_outline_get(struct Object *ob);
+struct Gwn_Batch *DRW_cache_mesh_edge_detection_get(struct Object *ob);
 struct Gwn_Batch *DRW_cache_mesh_surface_get(struct Object *ob);
 struct Gwn_Batch *DRW_cache_mesh_surface_weights_get(struct Object *ob);
 struct Gwn_Batch *DRW_cache_mesh_surface_vert_colors_get(struct Object *ob);