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, 36 insertions, 21 deletions

diff --git a/intern/cycles/kernel/svm/svm_attribute.h b/intern/cycles/kernel/svm/svm_attribute.h
index 62740824ad1..5f94b20af73 100644
--- a/intern/cycles/kernel/svm/svm_attribute.h
+++ b/intern/cycles/kernel/svm/svm_attribute.h
@@ -18,8 +18,11 @@ CCL_NAMESPACE_BEGIN
 
 /* Attribute Node */
 
-ccl_device AttributeDescriptor svm_node_attr_init(
-    KernelGlobals *kg, ShaderData *sd, uint4 node, NodeAttributeOutputType *type, uint *out_offset)
+ccl_device AttributeDescriptor svm_node_attr_init(const KernelGlobals *kg,
+                                                  ShaderData *sd,
+                                                  uint4 node,
+                                                  NodeAttributeOutputType *type,
+                                                  uint *out_offset)
 {
   *out_offset = node.z;
   *type = (NodeAttributeOutputType)node.w;
@@ -44,31 +47,37 @@ ccl_device AttributeDescriptor svm_node_attr_init(
   return desc;
 }
 
-ccl_device void svm_node_attr(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
+template<uint node_feature_mask>
+ccl_device_noinline void svm_node_attr(const KernelGlobals *kg,
+                                       ShaderData *sd,
+                                       float *stack,
+                                       uint4 node)
 {
   NodeAttributeOutputType type = NODE_ATTR_OUTPUT_FLOAT;
   uint out_offset = 0;
   AttributeDescriptor desc = svm_node_attr_init(kg, sd, node, &type, &out_offset);
 
 #ifdef __VOLUME__
-  /* Volumes
-   * NOTE: moving this into its own node type might help improve performance. */
-  if (primitive_is_volume_attribute(sd, desc)) {
-    const float4 value = volume_attribute_float4(kg, sd, desc);
+  if (KERNEL_NODES_FEATURE(VOLUME)) {
+    /* Volumes
+     * NOTE: moving this into its own node type might help improve performance. */
+    if (primitive_is_volume_attribute(sd, desc)) {
+      const float4 value = volume_attribute_float4(kg, sd, desc);
 
-    if (type == NODE_ATTR_OUTPUT_FLOAT) {
-      const float f = volume_attribute_value_to_float(value);
-      stack_store_float(stack, out_offset, f);
-    }
-    else if (type == NODE_ATTR_OUTPUT_FLOAT3) {
-      const float3 f = volume_attribute_value_to_float3(value);
-      stack_store_float3(stack, out_offset, f);
+      if (type == NODE_ATTR_OUTPUT_FLOAT) {
+        const float f = volume_attribute_value_to_float(value);
+        stack_store_float(stack, out_offset, f);
+      }
+      else if (type == NODE_ATTR_OUTPUT_FLOAT3) {
+        const float3 f = volume_attribute_value_to_float3(value);
+        stack_store_float3(stack, out_offset, f);
+      }
+      else {
+        const float f = volume_attribute_value_to_alpha(value);
+        stack_store_float(stack, out_offset, f);
+      }
+      return;
     }
-    else {
-      const float f = volume_attribute_value_to_alpha(value);
-      stack_store_float(stack, out_offset, f);
-    }
-    return;
   }
 #endif
 
@@ -139,7 +148,10 @@ ccl_device void svm_node_attr(KernelGlobals *kg, ShaderData *sd, float *stack, u
   }
 }
 
-ccl_device void svm_node_attr_bump_dx(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
+ccl_device_noinline void svm_node_attr_bump_dx(const KernelGlobals *kg,
+                                               ShaderData *sd,
+                                               float *stack,
+                                               uint4 node)
 {
   NodeAttributeOutputType type = NODE_ATTR_OUTPUT_FLOAT;
   uint out_offset = 0;
@@ -232,7 +244,10 @@ ccl_device void svm_node_attr_bump_dx(KernelGlobals *kg, ShaderData *sd, float *
   }
 }
 
-ccl_device void svm_node_attr_bump_dy(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
+ccl_device_noinline void svm_node_attr_bump_dy(const KernelGlobals *kg,
+                                               ShaderData *sd,
+                                               float *stack,
+                                               uint4 node)
 {
   NodeAttributeOutputType type = NODE_ATTR_OUTPUT_FLOAT;
   uint out_offset = 0;