Cycles: several small fixes and additions for MSL

This patch contains many small leftover fixes and additions that are
required for Metal-enablement:

- Address space fixes and a few other small compile fixes
- Addition of missing functionality to the Metal adapter headers
- Addition of various scattered `__KERNEL_METAL__` blocks (e.g. for
  atomic support & maths functions)

Ref T92212

Differential Revision: https://developer.blender.org/D13263

1 files changed, 4 insertions, 2 deletions

diff --git a/intern/cycles/kernel/sample/lcg.h b/intern/cycles/kernel/sample/lcg.h
index 92cfff639b4..e8c4915813e 100644
--- a/intern/cycles/kernel/sample/lcg.h
+++ b/intern/cycles/kernel/sample/lcg.h
@@ -19,14 +19,16 @@ CCL_NAMESPACE_BEGIN
 
 /* Linear Congruential Generator */
 
-ccl_device uint lcg_step_uint(uint *rng)
+/* This is templated to handle multiple address spaces on Metal. */
+template<class T> ccl_device uint lcg_step_uint(T rng)
 {
   /* implicit mod 2^32 */
   *rng = (1103515245 * (*rng) + 12345);
   return *rng;
 }
 
-ccl_device float lcg_step_float(uint *rng)
+/* This is templated to handle multiple address spaces on Metal. */
+template<class T> ccl_device float lcg_step_float(T rng)
 {
   /* implicit mod 2^32 */
   *rng = (1103515245 * (*rng) + 12345);