1 files changed, 86 insertions, 0 deletions
diff --git a/intern/cycles/kernel/split/kernel_subsurface_scatter.h b/intern/cycles/kernel/split/kernel_subsurface_scatter.h
new file mode 100644
index 00000000000..fcdd805f27b
--- /dev/null
+++ b/intern/cycles/kernel/split/kernel_subsurface_scatter.h
@@ -0,0 +1,86 @@
+
+
+CCL_NAMESPACE_BEGIN
+
+
+ccl_device void kernel_subsurface_scatter(KernelGlobals *kg)
+{
+#ifdef __SUBSURFACE__
+
+	ccl_local unsigned int local_queue_atomics;
+	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);
+	ray_index = get_ray_index(kg, ray_index,
+	                          QUEUE_ACTIVE_AND_REGENERATED_RAYS,
+	                          kernel_split_state.queue_data,
+	                          kernel_split_params.queue_size,
+	                          0);
+
+#ifdef __COMPUTE_DEVICE_GPU__
+	/* If we are executing on a GPU device, we exit all threads that are not
+	 * required.
+	 *
+	 * If we are executing on a CPU device, then we need to keep all threads
+	 * active since we have barrier() calls later in the kernel. CPU devices,
+	 * expect all threads to execute barrier statement.
+	 */
+	if(ray_index == QUEUE_EMPTY_SLOT) {
+		return;
+	}
+#endif
+
+#ifndef __COMPUTE_DEVICE_GPU__
+	if(ray_index != QUEUE_EMPTY_SLOT) {
+#endif
+
+
+	char enqueue_flag = 0;
+	ccl_global char *ray_state = kernel_split_state.ray_state;
+	ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
+	PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
+	ccl_global RNG *rng = &kernel_split_state.rng[ray_index];
+	ccl_global Ray *ray = &kernel_split_state.ray[ray_index];
+	ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index];
+	ccl_global SubsurfaceIndirectRays *ss_indirect = &kernel_split_state.ss_rays[ray_index];
+	ShaderData *sd = &kernel_split_state.sd[ray_index];
+	ShaderData *emission_sd = &kernel_split_state.sd_DL_shadow[ray_index];
+
+	if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
+		if(sd->flag & SD_BSSRDF) {
+			if(kernel_path_subsurface_scatter(kg,
+			                                  sd,
+			                                  emission_sd,
+			                                  L,
+			                                  state,
+			                                  rng,
+			                                  ray,
+			                                  throughput,
+			                                  ss_indirect)) {
+				ASSIGN_RAY_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER);
+				enqueue_flag = 1;
+			}
+		}
+	}
+
+#ifndef __COMPUTE_DEVICE_GPU__
+	}
+#endif
+
+	/* Enqueue RAY_UPDATE_BUFFER rays. */
+	enqueue_ray_index_local(ray_index,
+	                        QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
+	                        enqueue_flag,
+	                        kernel_split_params.queue_size,
+	                        &local_queue_atomics,
+	                        kernel_split_state.queue_data,
+	                        kernel_split_params.queue_index);
+
+#endif  /* __SUBSURFACE__ */
+
+}
+
+CCL_NAMESPACE_END