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, 6 deletions

diff --git a/intern/cycles/kernel/kernel_color.h b/intern/cycles/kernel/kernel_color.h
index 5eb1bdad02e..960774e0741 100644
--- a/intern/cycles/kernel/kernel_color.h
+++ b/intern/cycles/kernel/kernel_color.h
@@ -14,25 +14,22 @@
  * limitations under the License.
  */
 
-#ifndef __KERNEL_COLOR_H__
-#define __KERNEL_COLOR_H__
+#pragma once
 
 #include "util/util_color.h"
 
 CCL_NAMESPACE_BEGIN
 
-ccl_device float3 xyz_to_rgb(KernelGlobals *kg, float3 xyz)
+ccl_device float3 xyz_to_rgb(const KernelGlobals *kg, float3 xyz)
 {
   return make_float3(dot(float4_to_float3(kernel_data.film.xyz_to_r), xyz),
                      dot(float4_to_float3(kernel_data.film.xyz_to_g), xyz),
                      dot(float4_to_float3(kernel_data.film.xyz_to_b), xyz));
 }
 
-ccl_device float linear_rgb_to_gray(KernelGlobals *kg, float3 c)
+ccl_device float linear_rgb_to_gray(const KernelGlobals *kg, float3 c)
 {
   return dot(c, float4_to_float3(kernel_data.film.rgb_to_y));
 }
 
 CCL_NAMESPACE_END
-
-#endif /* __KERNEL_COLOR_H__ */