Cycles: Add CPU+GPU rendering support with OptiX

Adds support for building multiple BVH types in order to support using both CPU and OptiX
devices for rendering simultaneously. Primitive packing for Embree and OptiX is now
standalone, so it only needs to be run once and can be shared between the two. Additionally,
BVH building was made a device call, so that each device backend can decide how to
perform the building. The multi-device for instance creates a special multi-BVH that holds
references to several sub-BVHs, one for each sub-device.

Reviewed By: brecht, kevindietrich

Differential Revision: https://developer.blender.org/D9718

1 files changed, 39 insertions, 0 deletions

diff --git a/intern/cycles/bvh/bvh_multi.h b/intern/cycles/bvh/bvh_multi.h
new file mode 100644
index 00000000000..840438c5d0c
--- /dev/null
+++ b/intern/cycles/bvh/bvh_multi.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020, 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.
+ */
+
+#ifndef __BVH_MULTI_H__
+#define __BVH_MULTI_H__
+
+#include "bvh/bvh.h"
+#include "bvh/bvh_params.h"
+
+CCL_NAMESPACE_BEGIN
+
+class BVHMulti : public BVH {
+ public:
+  vector<BVH *> sub_bvhs;
+
+ protected:
+  friend class BVH;
+  BVHMulti(const BVHParams &params,
+           const vector<Geometry *> &geometry,
+           const vector<Object *> &objects);
+  virtual ~BVHMulti();
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __BVH_MULTI_H__ */