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/image.h

@@ -0,0 +1,67 @@
+/*
+ * 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 __IMAGE_H__
+#define __IMAGE_H__
+
+#include "device_memory.h"
+
+#include "util_string.h"
+#include "util_vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+#define TEX_IMAGE_MAX 100
+
+class Device;
+class DeviceScene;
+class Progress;
+
+class ImageManager {
+public:
+	ImageManager();
+	~ImageManager();
+
+	int add_image(const string& filename);
+	void remove_image(int slot);
+
+	void device_update(Device *device, DeviceScene *dscene, Progress& progress);
+	void device_free(Device *device, DeviceScene *dscene);
+
+	bool need_update;
+
+private:
+	struct Image {
+		string filename;
+
+		bool need_load;
+		int users;
+	};
+
+	vector<Image*> images;
+
+	bool file_load_image(Image *img, device_vector<uchar4>& tex_img);
+
+	void device_load_image(Device *device, DeviceScene *dscene, int slot);
+	void device_free_image(Device *device, DeviceScene *dscene, int slot);
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __IMAGE_H__ */
+