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, 64 deletions

diff --git a/intern/cycles/util/util_debug.h b/intern/cycles/util/util_debug.h
index f7e53f90f74..99e2723180c 100644
--- a/intern/cycles/util/util_debug.h
+++ b/intern/cycles/util/util_debug.h
@@ -79,9 +79,6 @@ class DebugFlags {
      * CPUs and GPUs can be selected here instead.
      */
     BVHLayout bvh_layout;
-
-    /* Whether split kernel is used */
-    bool split_kernel;
   };
 
   /* Descriptor of CUDA feature-set to be used. */
@@ -94,9 +91,6 @@ class DebugFlags {
     /* Whether adaptive feature based runtime compile is enabled or not.
      * Requires the CUDA Toolkit and only works on Linux atm. */
     bool adaptive_compile;
-
-    /* Whether split kernel is used */
-    bool split_kernel;
   };
 
   /* Descriptor of OptiX feature-set to be used. */
@@ -106,61 +100,9 @@ class DebugFlags {
     /* Reset flags to their defaults. */
     void reset();
 
-    /* Number of CUDA streams to launch kernels concurrently from. */
-    int cuda_streams;
-
-    /* Use OptiX curves API for hair instead of custom implementation. */
-    bool curves_api;
-  };
-
-  /* Descriptor of OpenCL feature-set to be used. */
-  struct OpenCL {
-    OpenCL();
-
-    /* Reset flags to their defaults. */
-    void reset();
-
-    /* Available device types.
-     * Only gives a hint which devices to let user to choose from, does not
-     * try to use any sort of optimal device or so.
-     */
-    enum DeviceType {
-      /* None of OpenCL devices will be used. */
-      DEVICE_NONE,
-      /* All OpenCL devices will be used. */
-      DEVICE_ALL,
-      /* Default system OpenCL device will be used. */
-      DEVICE_DEFAULT,
-      /* Host processor will be used. */
-      DEVICE_CPU,
-      /* GPU devices will be used. */
-      DEVICE_GPU,
-      /* Dedicated OpenCL accelerator device will be used. */
-      DEVICE_ACCELERATOR,
-    };
-
-    /* Available kernel types. */
-    enum KernelType {
-      /* Do automated guess which kernel to use, based on the officially
-       * supported GPUs and such.
-       */
-      KERNEL_DEFAULT,
-      /* Force mega kernel to be used. */
-      KERNEL_MEGA,
-      /* Force split kernel to be used. */
-      KERNEL_SPLIT,
-    };
-
-    /* Requested device type. */
-    DeviceType device_type;
-
-    /* Use debug version of the kernel. */
-    bool debug;
-
-    /* TODO(mai): Currently this is only for OpenCL, but we should have it implemented for all
-     * devices. */
-    /* Artificial memory limit in bytes (0 if disabled). */
-    size_t mem_limit;
+    /* Load OptiX module with debug capabilities. Will lower logging verbosity level, enable
+     * validations, and lower optimization level. */
+    bool use_debug;
   };
 
   /* Get instance of debug flags registry. */
@@ -182,9 +124,6 @@ class DebugFlags {
   /* Requested OptiX flags. */
   OptiX optix;
 
-  /* Requested OpenCL flags. */
-  OpenCL opencl;
-
  private:
   DebugFlags();