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/render/svm.h

@@ -0,0 +1,104 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __SVM_H__
+#define __SVM_H__
+
+#include "attribute.h"
+#include "graph.h"
+#include "shader.h"
+
+#include "util_set.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Device;
+class DeviceScene;
+class ImageManager;
+class KernelSunSky;
+class Scene;
+class ShaderGraph;
+class ShaderInput;
+class ShaderNode;
+class ShaderOutput;
+
+/* Shader Manager */
+
+class SVMShaderManager : public ShaderManager {
+public:
+	SVMShaderManager();
+	~SVMShaderManager();
+
+	void device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress);
+	void device_free(Device *device, DeviceScene *dscene);
+};
+
+/* Graph Compiler */
+
+class SVMCompiler {
+public:
+	SVMCompiler(ShaderManager *shader_manager, ImageManager *image_manager);
+	void compile(Shader *shader, vector<int4>& svm_nodes, int index);
+
+	void stack_assign(ShaderOutput *output);
+	void stack_assign(ShaderInput *input);
+	void stack_link(ShaderInput *input, ShaderOutput *output);
+	void add_node(NodeType type, int a = 0, int b = 0, int c = 0);
+	void add_node(int a = 0, int b = 0, int c = 0, int d = 0);
+	void add_node(NodeType type, const float3& f);
+	void add_node(const float4& f);
+	uint attribute(ustring name);
+	uint attribute(Attribute::Standard std);
+	uint encode_uchar4(uint x, uint y = 0, uint z = 0, uint w = 0);
+
+	ShaderType output_type() { return current_type; }
+
+	ImageManager *image_manager;
+	ShaderManager *shader_manager;
+	KernelSunSky *sunsky;
+	bool background;
+
+protected:
+	struct Stack {
+		int users[SVM_STACK_SIZE];
+	};
+
+	void stack_clear_temporary(ShaderNode *node);
+	int stack_size(ShaderSocketType type);
+	int stack_find_offset(ShaderSocketType type);
+	void stack_clear_users(ShaderNode *node, set<ShaderNode*>& done);
+
+	bool node_skip_input(ShaderNode *node, ShaderInput *input);
+
+	void find_dependencies(set<ShaderNode*>& dependencies, const set<ShaderNode*>& done, ShaderInput *input);
+	void generate_svm_nodes(const set<ShaderNode*>& nodes, set<ShaderNode*>& done);
+	void generate_closure(ShaderNode *node, set<ShaderNode*> done, Stack stack);
+
+	void compile_type(Shader *shader, ShaderGraph *graph, ShaderType type);
+
+	vector<int4> svm_nodes;
+	ShaderType current_type;
+	Shader *current_shader;
+	Stack active_stack;
+	int max_stack_use;
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __SVM_H__ */
+