Merge remote-tracking branch 'origin/master' into openvdbopenvdb

1 files changed, 81 insertions, 0 deletions

diff --git a/intern/cycles/kernel/split/kernel_path_init.h b/intern/cycles/kernel/split/kernel_path_init.h
new file mode 100644
index 00000000000..5ad62b585fe
--- /dev/null
+++ b/intern/cycles/kernel/split/kernel_path_init.h
@@ -0,0 +1,81 @@
+/*
+ * 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
+
+/* This kernel initializes structures needed in path-iteration kernels.
+ * This is the first kernel in ray-tracing logic.
+ *
+ * Ray state of rays outside the tile-boundary will be marked RAY_INACTIVE
+ */
+ccl_device void kernel_path_init(KernelGlobals *kg) {
+	int ray_index = ccl_global_id(0) + ccl_global_id(1) * ccl_global_size(0);
+
+	/* This is the first assignment to ray_state;
+	 * So we dont use ASSIGN_RAY_STATE macro.
+	 */
+	kernel_split_state.ray_state[ray_index] = RAY_ACTIVE;
+
+	/* Get work. */
+	ccl_global uint *work_pools = kernel_split_params.work_pools;
+	uint total_work_size = kernel_split_params.total_work_size;
+	uint work_index;
+
+	if(!get_next_work(kg, work_pools, total_work_size, ray_index, &work_index)) {
+		/* No more work, mark ray as inactive */
+		kernel_split_state.ray_state[ray_index] = RAY_INACTIVE;
+
+		return;
+	}
+
+	ccl_global WorkTile *tile = &kernel_split_params.tile;
+	uint x, y, sample;
+	get_work_pixel(tile, work_index, &x, &y, &sample);
+
+	/* Store buffer offset for writing to passes. */
+	uint buffer_offset = (tile->offset + x + y*tile->stride) * kernel_data.film.pass_stride;
+	kernel_split_state.buffer_offset[ray_index] = buffer_offset;
+
+	/* Initialize random numbers and ray. */
+	uint rng_hash;
+	kernel_path_trace_setup(kg,
+	                        sample,
+	                        x, y,
+	                        &rng_hash,
+	                        &kernel_split_state.ray[ray_index]);
+
+	if(kernel_split_state.ray[ray_index].t != 0.0f) {
+		/* Initialize throughput, path radiance, Ray, PathState;
+		 * These rays proceed with path-iteration.
+		 */
+		kernel_split_state.throughput[ray_index] = make_float3(1.0f, 1.0f, 1.0f);
+		path_radiance_init(&kernel_split_state.path_radiance[ray_index], kernel_data.film.use_light_pass);
+		path_state_init(kg,
+		                &kernel_split_state.sd_DL_shadow[ray_index],
+		                &kernel_split_state.path_state[ray_index],
+		                rng_hash,
+		                sample,
+		                &kernel_split_state.ray[ray_index]);
+#ifdef __SUBSURFACE__
+		kernel_path_subsurface_init_indirect(&kernel_split_state.ss_rays[ray_index]);
+#endif
+	}
+	else {
+		ASSIGN_RAY_STATE(kernel_split_state.ray_state, ray_index, RAY_TO_REGENERATE);
+	}
+}
+
+CCL_NAMESPACE_END