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, 13 insertions, 8 deletions

diff --git a/intern/cycles/kernel/geom/geom_curve.h b/intern/cycles/kernel/geom/geom_curve.h
index b5a62a31ca9..a827a67ce7a 100644
--- a/intern/cycles/kernel/geom/geom_curve.h
+++ b/intern/cycles/kernel/geom/geom_curve.h
@@ -12,6 +12,8 @@
  * limitations under the License.
  */
 
+#pragma once
+
 CCL_NAMESPACE_BEGIN
 
 /* Curve Primitive
@@ -25,8 +27,11 @@ CCL_NAMESPACE_BEGIN
 
 /* Reading attributes on various curve elements */
 
-ccl_device float curve_attribute_float(
-    KernelGlobals *kg, const ShaderData *sd, const AttributeDescriptor desc, float *dx, float *dy)
+ccl_device float curve_attribute_float(const KernelGlobals *kg,
+                                       const ShaderData *sd,
+                                       const AttributeDescriptor desc,
+                                       float *dx,
+                                       float *dy)
 {
   if (desc.element & (ATTR_ELEMENT_CURVE_KEY | ATTR_ELEMENT_CURVE_KEY_MOTION)) {
     float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
@@ -64,7 +69,7 @@ ccl_device float curve_attribute_float(
   }
 }
 
-ccl_device float2 curve_attribute_float2(KernelGlobals *kg,
+ccl_device float2 curve_attribute_float2(const KernelGlobals *kg,
                                          const ShaderData *sd,
                                          const AttributeDescriptor desc,
                                          float2 *dx,
@@ -110,7 +115,7 @@ ccl_device float2 curve_attribute_float2(KernelGlobals *kg,
   }
 }
 
-ccl_device float3 curve_attribute_float3(KernelGlobals *kg,
+ccl_device float3 curve_attribute_float3(const KernelGlobals *kg,
                                          const ShaderData *sd,
                                          const AttributeDescriptor desc,
                                          float3 *dx,
@@ -152,7 +157,7 @@ ccl_device float3 curve_attribute_float3(KernelGlobals *kg,
   }
 }
 
-ccl_device float4 curve_attribute_float4(KernelGlobals *kg,
+ccl_device float4 curve_attribute_float4(const KernelGlobals *kg,
                                          const ShaderData *sd,
                                          const AttributeDescriptor desc,
                                          float4 *dx,
@@ -196,7 +201,7 @@ ccl_device float4 curve_attribute_float4(KernelGlobals *kg,
 
 /* Curve thickness */
 
-ccl_device float curve_thickness(KernelGlobals *kg, ShaderData *sd)
+ccl_device float curve_thickness(const KernelGlobals *kg, const ShaderData *sd)
 {
   float r = 0.0f;
 
@@ -224,7 +229,7 @@ ccl_device float curve_thickness(KernelGlobals *kg, ShaderData *sd)
 /* Curve location for motion pass, linear interpolation between keys and
  * ignoring radius because we do the same for the motion keys */
 
-ccl_device float3 curve_motion_center_location(KernelGlobals *kg, ShaderData *sd)
+ccl_device float3 curve_motion_center_location(const KernelGlobals *kg, const ShaderData *sd)
 {
   float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
   int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type);
@@ -240,7 +245,7 @@ ccl_device float3 curve_motion_center_location(KernelGlobals *kg, ShaderData *sd
 
 /* Curve tangent normal */
 
-ccl_device float3 curve_tangent_normal(KernelGlobals *kg, ShaderData *sd)
+ccl_device float3 curve_tangent_normal(const KernelGlobals *kg, const ShaderData *sd)
 {
   float3 tgN = make_float3(0.0f, 0.0f, 0.0f);