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, 3 insertions, 27 deletions

diff --git a/source/blender/render/intern/render_types.h b/source/blender/render/intern/render_types.h
index d2d2b499495..ca4f72350e1 100644
--- a/source/blender/render/intern/render_types.h
+++ b/source/blender/render/intern/render_types.h
@@ -47,30 +47,10 @@ struct ReportList;
 extern "C" {
 #endif
 
-/* this is handed over to threaded hiding/passes/shading engine */
-typedef struct RenderPart {
-  struct RenderPart *next, *prev;
-
-  RenderResult *result; /* result of part rendering */
-  ListBase fullresult;  /* optional full sample buffers */
-
-  rcti disprect;    /* part coordinates within total picture */
-  int rectx, recty; /* the size */
-  int nr;           /* nr is partnr */
-  short status;
-} RenderPart;
-
 typedef struct HighlightedTile {
   rcti rect;
 } HighlightedTile;
 
-enum {
-  /* PART_STATUS_NONE = 0, */ /* UNUSED */
-  PART_STATUS_IN_PROGRESS = 1,
-  PART_STATUS_RENDERED = 2,
-  PART_STATUS_MERGED = 3,
-};
-
 /* controls state of render, everything that's read-only during render stage */
 struct Render {
   struct Render *next, *prev;
@@ -91,6 +71,9 @@ struct Render {
    * to not conflict with writes, so no lock used for that */
   ThreadRWMutex resultmutex;
 
+  /* Guard for drawing render result using engine's `draw()` callback. */
+  ThreadMutex engine_draw_mutex;
+
   /** Window size, display rect, viewplane.
    * \note Buffer width and height with percentage applied
    * without border & crop. convert to long before multiplying together to avoid overflow. */
@@ -101,10 +84,6 @@ struct Render {
   /* final picture width and height (within disprect) */
   int rectx, recty;
 
-  /* real maximum size of parts after correction for minimum
-   * partx*xparts can be larger than rectx, in that case last part is smaller */
-  int partx, party;
-
   /* Camera transform, only used by Freestyle. */
   float winmat[4][4];
 
@@ -120,9 +99,6 @@ struct Render {
   int active_view_layer;
   struct Object *camera_override;
 
-  ThreadRWMutex partsmutex;
-  struct GHash *parts;
-
   ThreadMutex highlighted_tiles_mutex;
   struct GSet *highlighted_tiles;