Cycles: merge of cycles-x branch, a major update to the renderer

This includes much improved GPU rendering performance, viewport interactivity,
new shadow catcher, revamped sampling settings, subsurface scattering anisotropy,
new GPU volume sampling, improved PMJ sampling pattern, and more.

Some features have also been removed or changed, breaking backwards compatibility.
Including the removal of the OpenCL backend, for which alternatives are under
development.

Release notes and code docs:
https://wiki.blender.org/wiki/Reference/Release_Notes/3.0/Cycles
https://wiki.blender.org/wiki/Source/Render/Cycles

Credits:
* Sergey Sharybin
* Brecht Van Lommel
* Patrick Mours (OptiX backend)
* Christophe Hery (subsurface scattering anisotropy)
* William Leeson (PMJ sampling pattern)
* Alaska (various fixes and tweaks)
* Thomas Dinges (various fixes)

For the full commit history, see the cycles-x branch. This squashes together
all the changes since intermediate changes would often fail building or tests.

Ref T87839, T87837, T87836
Fixes T90734, T89353, T80267, T80267, T77185, T69800

1 files changed, 20 insertions, 6 deletions

diff --git a/source/blender/blenloader/intern/versioning_cycles.c b/source/blender/blenloader/intern/versioning_cycles.c
index 90e6b43f02e..da57f27af4e 100644
--- a/source/blender/blenloader/intern/versioning_cycles.c
+++ b/source/blender/blenloader/intern/versioning_cycles.c
@@ -182,8 +182,8 @@ static void displacement_principled_nodes(bNode *node)
     }
   }
   else if (node->type == SH_NODE_BSDF_PRINCIPLED) {
-    if (node->custom2 != SHD_SUBSURFACE_RANDOM_WALK) {
-      node->custom2 = SHD_SUBSURFACE_BURLEY;
+    if (node->custom2 != SHD_SUBSURFACE_RANDOM_WALK_FIXED_RADIUS) {
+      node->custom2 = SHD_SUBSURFACE_DIFFUSION;
     }
   }
 }
@@ -1373,6 +1373,11 @@ void blo_do_versions_cycles(FileData *UNUSED(fd), Library *UNUSED(lib), Main *bm
 
 void do_versions_after_linking_cycles(Main *bmain)
 {
+  const int DENOISER_AUTO = 0;
+  const int DENOISER_NLM = 1;
+  const int DENOISER_OPTIX = 2;
+  const int DENOISER_OPENIMAGEDENOISE = 4;
+
   if (!MAIN_VERSION_ATLEAST(bmain, 280, 66)) {
     /* Shader node tree changes. After lib linking so we have all the typeinfo
      * pointers and updated sockets and we can use the high level node API to
@@ -1578,10 +1583,6 @@ void do_versions_after_linking_cycles(Main *bmain)
       }
 
       if (cscene) {
-        const int DENOISER_AUTO = 0;
-        const int DENOISER_NLM = 1;
-        const int DENOISER_OPTIX = 2;
-
         /* Enable denoiser if it was enabled for one view layer before. */
         cycles_property_int_set(cscene, "denoiser", (use_optix) ? DENOISER_OPTIX : DENOISER_NLM);
         cycles_property_boolean_set(cscene, "use_denoising", use_denoising);
@@ -1637,4 +1638,17 @@ void do_versions_after_linking_cycles(Main *bmain)
       object->visibility_flag |= flag;
     }
   }
+
+  if (!MAIN_VERSION_ATLEAST(bmain, 300, 25)) {
+    /* Removal of NLM denoiser. */
+    for (Scene *scene = bmain->scenes.first; scene; scene = scene->id.next) {
+      IDProperty *cscene = cycles_properties_from_ID(&scene->id);
+
+      if (cscene) {
+        if (cycles_property_int(cscene, "denoiser", DENOISER_NLM) == DENOISER_NLM) {
+          cycles_property_int_set(cscene, "denoiser", DENOISER_OPENIMAGEDENOISE);
+        }
+      }
+    }
+  }
 }