Cycles: Display RenderPass in Viewport

This change allows the user to select a renderpass in the 3d viewport.

Added support for external renderers to extend the `View3DShading` struct.
This way Blender doesn't need to know the features an external render engine wants to support.
Note that the View3DShading is also available in the scene->display.shading; although this is
supported, it does not make sense for render engines to put something here as it is really
scene/workbench related.

Currently cycles assumes that it always needs to calculate the combined pass; it ignores the
`pass_flag` in KernelFilm. We could optimize this but that was not in scope of this change

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5689

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 5974100b534..a8f662991b6 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -39,6 +39,7 @@
 #include "BKE_context.h"
 #include "BKE_curve.h"
 #include "BKE_icons.h"
+#include "BKE_idprop.h"
 #include "BKE_lattice.h"
 #include "BKE_main.h"
 #include "BKE_mball.h"
@@ -363,6 +364,11 @@ static void view3d_free(SpaceLink *sl)
   if (vd->fx_settings.dof) {
     MEM_freeN(vd->fx_settings.dof);
   }
+
+  if (vd->shading.prop) {
+    IDP_FreeProperty(vd->shading.prop);
+    vd->shading.prop = NULL;
+  }
 }
 
 /* spacetype; init callback */