Cycles: use reference count to detect used shaders

Shaders are only compiled if they are used by some other Node (Geometry, Light, etc.).
This usage detection is done before updating the Scene, however it fails at detecting
Shaders used by Procedurals not known to Cycles (e.g. ones defined by third party
applications), as Procedurals are only updated after the shaders are compiled.

To remedy this, we now use the Node reference counting mechanism to detect whether a
Shader is used and therefore should be compiled.

This removes `ShaderManager::update_shaders_used` as it is not needed anymore, however,
since it would also update the Shader ids, this is now performed in
`ShaderManager::device_update`, and a new virtual `device_update_specific` method was
added to handle device updates for SVM and OSL.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D10965

1 files changed, 4 insertions, 1 deletions

diff --git a/intern/cycles/render/svm.h b/intern/cycles/render/svm.h
index a4ca68e1d8d..85b4b9c419f 100644
--- a/intern/cycles/render/svm.h
+++ b/intern/cycles/render/svm.h
@@ -46,7 +46,10 @@ class SVMShaderManager : public ShaderManager {
 
   void reset(Scene *scene);
 
-  void device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress &progress);
+  void device_update_specific(Device *device,
+                              DeviceScene *dscene,
+                              Scene *scene,
+                              Progress &progress) override;
   void device_free(Device *device, DeviceScene *dscene, Scene *scene);
 
  protected: