Cycles: Add kernel to enqueue inactive rays

The queue will be used to make reuse of inactive threads to keep
the GPU more busy.

1 files changed, 46 insertions, 0 deletions

diff --git a/intern/cycles/kernel/split/kernel_enqueue_inactive.h b/intern/cycles/kernel/split/kernel_enqueue_inactive.h
new file mode 100644
index 00000000000..496355bbc3a
--- /dev/null
+++ b/intern/cycles/kernel/split/kernel_enqueue_inactive.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2011-2017 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CCL_NAMESPACE_BEGIN
+
+ccl_device void kernel_enqueue_inactive(KernelGlobals *kg,
+                                        ccl_local_param unsigned int *local_queue_atomics)
+{
+#ifdef __BRANCHED_PATH__
+	/* Enqeueue RAY_INACTIVE rays into QUEUE_INACTIVE_RAYS queue. */
+	if(ccl_local_id(0) == 0 && ccl_local_id(1) == 0) {
+		*local_queue_atomics = 0;
+	}
+	ccl_barrier(CCL_LOCAL_MEM_FENCE);
+
+	int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
+
+	char enqueue_flag = 0;
+	if(IS_STATE(kernel_split_state.ray_state, ray_index, RAY_INACTIVE)) {
+		enqueue_flag = 1;
+	}
+
+	enqueue_ray_index_local(ray_index,
+	                        QUEUE_INACTIVE_RAYS,
+	                        enqueue_flag,
+	                        kernel_split_params.queue_size,
+	                        local_queue_atomics,
+	                        kernel_split_state.queue_data,
+	                        kernel_split_params.queue_index);
+#endif  /* __BRANCHED_PATH__ */
+}
+
+CCL_NAMESPACE_END