intern/cycles/device/metal/device.mm

@@ -74,6 +74,9 @@ void device_metal_info(vector<DeviceInfo> &devices)
     }
 #  endif
 
+    /* Use hardware raytracing for faster rendering on architectures that support it. */
+    info.use_metalrt_by_default = (MetalInfo::get_apple_gpu_architecture(device) >= APPLE_M3);
+
     devices.push_back(info);
     device_index++;
   }

intern/cycles/device/metal/kernel.mm

@@ -41,6 +41,12 @@ struct ShaderCache {
     if (MetalInfo::get_device_vendor(mtlDevice) == METAL_GPU_APPLE) {
       switch (MetalInfo::get_apple_gpu_architecture(mtlDevice)) {
         default:
+        case APPLE_M3:
+          /* Peak occupancy is achieved through Dynamic Caching on M3 GPUs. */
+          for (size_t i = 0; i < DEVICE_KERNEL_NUM; i++) {
+            occupancy_tuning[i] = {64, 64};
+          }
+          break;
         case APPLE_M2_BIG:
           occupancy_tuning[DEVICE_KERNEL_INTEGRATOR_COMPACT_SHADOW_STATES] = {384, 128};
           occupancy_tuning[DEVICE_KERNEL_INTEGRATOR_INIT_FROM_CAMERA] = {640, 128};

intern/cycles/device/metal/util.h

@@ -31,6 +31,7 @@ enum AppleGPUArchitecture {
   APPLE_M1,
   APPLE_M2,
   APPLE_M2_BIG,
+  APPLE_M3,
 };
 
 /* Contains static Metal helper functions. */

intern/cycles/device/metal/util.mm

@@ -56,6 +56,9 @@ AppleGPUArchitecture MetalInfo::get_apple_gpu_architecture(id<MTLDevice> device)
   else if (strstr(device_name, "M2")) {
     return get_apple_gpu_core_count(device) <= 10 ? APPLE_M2 : APPLE_M2_BIG;
   }
+  else if (strstr(device_name, "M3")) {
+    return APPLE_M3;
+  }
   return APPLE_UNKNOWN;
 }