Cycles: threading optimizations

* Multithreaded image loading, each thread can load a separate image.
* Better multithreading for multiple instanced meshes, different threads can now
  build BVH's for different meshes, rather than all cooperating on the same mesh.
  Especially noticeable for dynamic BVH building for the viewport, gave about
  2x faster build on 8 core in fairly complex scene with many objects.
* The main thread waiting for worker threads can now also work itself, so
  (num_cores + 1) threads will be working, this supposedly gives better
  performance on some operating systems, but did not measure performance for
  this very detailed yet.

1 files changed, 1 insertions, 1 deletions

diff --git a/intern/cycles/render/mesh.h b/intern/cycles/render/mesh.h
index 047a2d2624d..637143f5adf 100644
--- a/intern/cycles/render/mesh.h
+++ b/intern/cycles/render/mesh.h
@@ -96,7 +96,7 @@ public:
 
 	void pack_normals(Scene *scene, float4 *normal, float4 *vnormal);
 	void pack_verts(float4 *tri_verts, float4 *tri_vindex, size_t vert_offset);
-	void compute_bvh(SceneParams *params, Progress& progress);
+	void compute_bvh(SceneParams *params, Progress *progress, int n, int total);
 
 	bool need_attribute(Scene *scene, AttributeStandard std);
 	bool need_attribute(Scene *scene, ustring name);