From da376e0237517543aa21740ee2363234ee1c20ae Mon Sep 17 00:00:00 2001
From: Ton Roosendaal <ton@blender.org>
Date: Wed, 27 Apr 2011 11:58:34 +0000
Subject: Cycles render engine, initial commit. This is the engine itself,
 blender modifications and build instructions will follow later.

Cycles uses code from some great open source projects, many thanks them:

* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
---
 intern/cycles/bvh/bvh_node.h | 108 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 intern/cycles/bvh/bvh_node.h

(limited to 'intern/cycles/bvh/bvh_node.h')

diff --git a/intern/cycles/bvh/bvh_node.h b/intern/cycles/bvh/bvh_node.h
new file mode 100644
index 00000000000..d83c006b93d
--- /dev/null
+++ b/intern/cycles/bvh/bvh_node.h
@@ -0,0 +1,108 @@
+/*
+ * Adapted from code copyright 2009-2010 NVIDIA Corporation
+ * Modifications Copyright 2011, 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_NODE_H__
+#define __BVH_NODE_H__
+
+#include "util_boundbox.h"
+#include "util_debug.h"
+#include "util_types.h"
+
+CCL_NAMESPACE_BEGIN
+
+enum BVH_STAT
+{
+	BVH_STAT_NODE_COUNT,
+	BVH_STAT_INNER_COUNT,
+	BVH_STAT_LEAF_COUNT,
+	BVH_STAT_TRIANGLE_COUNT,
+	BVH_STAT_CHILDNODE_COUNT
+};
+
+class BVHParams;
+
+class BVHNode
+{
+public:
+	BVHNode()
+	{
+	}
+
+	virtual bool is_leaf() const = 0;
+	virtual int num_children() const = 0;
+	virtual BVHNode *get_child(int i) const = 0;
+	virtual int num_triangles() const { return 0; }
+	virtual void print(int depth = 0) const = 0;
+
+	float getArea() const { return m_bounds.area(); }
+
+	BoundBox m_bounds;
+
+	// Subtree functions
+	int getSubtreeSize(BVH_STAT stat=BVH_STAT_NODE_COUNT) const;
+	float computeSubtreeSAHCost(const BVHParams& p, float probability = 1.0f) const;	
+	void deleteSubtree();
+};
+
+class InnerNode : public BVHNode
+{
+public:
+	InnerNode(const BoundBox& bounds, BVHNode* child0, BVHNode* child1)
+	{
+		m_bounds = bounds;
+		children[0] = child0;
+		children[1] = child1;
+	}
+
+	bool is_leaf() const { return false; }
+	int num_children() const { return 2; }
+	BVHNode *get_child(int i) const{ assert(i>=0 && i<2); return children[i]; }
+	void print(int depth) const;
+
+	BVHNode *children[2];
+};
+
+class LeafNode : public BVHNode
+{
+public:
+	LeafNode(const BoundBox& bounds, int lo, int hi) 
+	{
+		m_bounds = bounds;
+		m_lo = lo;
+		m_hi = hi;
+	}
+
+	LeafNode(const LeafNode& s)
+	: BVHNode()
+	{
+		*this = s;
+	}
+
+	bool is_leaf() const { return true; }
+	int num_children() const { return 0; }
+	BVHNode *get_child(int) const { return NULL; }
+	int num_triangles() const { return m_hi - m_lo; }
+	void print(int depth) const;
+
+	int m_lo;
+	int m_hi;
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __BVH_NODE_H__ */
+
-- 
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