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, 18 insertions, 11 deletions

diff --git a/intern/cycles/kernel/geom/geom_subd_triangle.h b/intern/cycles/kernel/geom/geom_subd_triangle.h
index 9eceb996926..877b2ece15b 100644
--- a/intern/cycles/kernel/geom/geom_subd_triangle.h
+++ b/intern/cycles/kernel/geom/geom_subd_triangle.h
@@ -16,18 +16,20 @@
 
 /* Functions for retrieving attributes on triangles produced from subdivision meshes */
 
+#pragma once
+
 CCL_NAMESPACE_BEGIN
 
 /* Patch index for triangle, -1 if not subdivision triangle */
 
-ccl_device_inline uint subd_triangle_patch(KernelGlobals *kg, const ShaderData *sd)
+ccl_device_inline uint subd_triangle_patch(const KernelGlobals *kg, const ShaderData *sd)
 {
   return (sd->prim != PRIM_NONE) ? kernel_tex_fetch(__tri_patch, sd->prim) : ~0;
 }
 
 /* UV coords of triangle within patch */
 
-ccl_device_inline void subd_triangle_patch_uv(KernelGlobals *kg,
+ccl_device_inline void subd_triangle_patch_uv(const KernelGlobals *kg,
                                               const ShaderData *sd,
                                               float2 uv[3])
 {
@@ -40,7 +42,7 @@ ccl_device_inline void subd_triangle_patch_uv(KernelGlobals *kg,
 
 /* Vertex indices of patch */
 
-ccl_device_inline uint4 subd_triangle_patch_indices(KernelGlobals *kg, int patch)
+ccl_device_inline uint4 subd_triangle_patch_indices(const KernelGlobals *kg, int patch)
 {
   uint4 indices;
 
@@ -54,21 +56,23 @@ ccl_device_inline uint4 subd_triangle_patch_indices(KernelGlobals *kg, int patch
 
 /* Originating face for patch */
 
-ccl_device_inline uint subd_triangle_patch_face(KernelGlobals *kg, int patch)
+ccl_device_inline uint subd_triangle_patch_face(const KernelGlobals *kg, int patch)
 {
   return kernel_tex_fetch(__patches, patch + 4);
 }
 
 /* Number of corners on originating face */
 
-ccl_device_inline uint subd_triangle_patch_num_corners(KernelGlobals *kg, int patch)
+ccl_device_inline uint subd_triangle_patch_num_corners(const KernelGlobals *kg, int patch)
 {
   return kernel_tex_fetch(__patches, patch + 5) & 0xffff;
 }
 
 /* Indices of the four corners that are used by the patch */
 
-ccl_device_inline void subd_triangle_patch_corners(KernelGlobals *kg, int patch, int corners[4])
+ccl_device_inline void subd_triangle_patch_corners(const KernelGlobals *kg,
+                                                   int patch,
+                                                   int corners[4])
 {
   uint4 data;
 
@@ -99,8 +103,11 @@ ccl_device_inline void subd_triangle_patch_corners(KernelGlobals *kg, int patch,
 
 /* Reading attributes on various subdivision triangle elements */
 
-ccl_device_noinline float subd_triangle_attribute_float(
-    KernelGlobals *kg, const ShaderData *sd, const AttributeDescriptor desc, float *dx, float *dy)
+ccl_device_noinline float subd_triangle_attribute_float(const KernelGlobals *kg,
+                                                        const ShaderData *sd,
+                                                        const AttributeDescriptor desc,
+                                                        float *dx,
+                                                        float *dy)
 {
   int patch = subd_triangle_patch(kg, sd);
 
@@ -235,7 +242,7 @@ ccl_device_noinline float subd_triangle_attribute_float(
   }
 }
 
-ccl_device_noinline float2 subd_triangle_attribute_float2(KernelGlobals *kg,
+ccl_device_noinline float2 subd_triangle_attribute_float2(const KernelGlobals *kg,
                                                           const ShaderData *sd,
                                                           const AttributeDescriptor desc,
                                                           float2 *dx,
@@ -378,7 +385,7 @@ ccl_device_noinline float2 subd_triangle_attribute_float2(KernelGlobals *kg,
   }
 }
 
-ccl_device_noinline float3 subd_triangle_attribute_float3(KernelGlobals *kg,
+ccl_device_noinline float3 subd_triangle_attribute_float3(const KernelGlobals *kg,
                                                           const ShaderData *sd,
                                                           const AttributeDescriptor desc,
                                                           float3 *dx,
@@ -520,7 +527,7 @@ ccl_device_noinline float3 subd_triangle_attribute_float3(KernelGlobals *kg,
   }
 }
 
-ccl_device_noinline float4 subd_triangle_attribute_float4(KernelGlobals *kg,
+ccl_device_noinline float4 subd_triangle_attribute_float4(const KernelGlobals *kg,
                                                           const ShaderData *sd,
                                                           const AttributeDescriptor desc,
                                                           float4 *dx,