Cycles: Metal host-side code

This patch adds the Metal host-side code:

- Add all core host-side Metal backend files (device_impl, queue, etc)
- Add MetalRT BVH setup files
- Integrate with Cycles device enumeration code
- Revive `path_source_replace_includes` in util/path (required for MSL compilation)

This patch also includes a couple of small kernel-side fixes:

- Add an implementation of `lgammaf` for Metal [Nemes, Gergő (2010), "New asymptotic expansion for the Gamma function", Archiv der Mathematik](https://users.renyi.hu/~gergonemes/)
- include "work_stealing.h" inside the Metal context class because it accesses state now

Ref T92212

Reviewed By: brecht

Maniphest Tasks: T92212

Differential Revision: https://developer.blender.org/D13423

1 files changed, 3 insertions, 0 deletions

diff --git a/intern/cycles/device/device.h b/intern/cycles/device/device.h
index 346632de314..c032773ddd0 100644
--- a/intern/cycles/device/device.h
+++ b/intern/cycles/device/device.h
@@ -52,6 +52,7 @@ enum DeviceType {
   DEVICE_MULTI,
   DEVICE_OPTIX,
   DEVICE_HIP,
+  DEVICE_METAL,
   DEVICE_DUMMY,
 };
 
@@ -60,6 +61,7 @@ enum DeviceTypeMask {
   DEVICE_MASK_CUDA = (1 << DEVICE_CUDA),
   DEVICE_MASK_OPTIX = (1 << DEVICE_OPTIX),
   DEVICE_MASK_HIP = (1 << DEVICE_HIP),
+  DEVICE_MASK_METAL = (1 << DEVICE_METAL),
   DEVICE_MASK_ALL = ~0
 };
 
@@ -281,6 +283,7 @@ class Device {
   static vector<DeviceInfo> optix_devices;
   static vector<DeviceInfo> cpu_devices;
   static vector<DeviceInfo> hip_devices;
+  static vector<DeviceInfo> metal_devices;
   static uint devices_initialized_mask;
 };