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/buffers.h

@@ -0,0 +1,94 @@
+/*
+ * 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 __BUFFERS_H__
+#define __BUFFERS_H__
+
+#include "device_memory.h"
+
+#include "util_string.h"
+#include "util_thread.h"
+#include "util_types.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Device;
+class float4;
+
+/* Render Buffers */
+
+class RenderBuffers {
+public:
+	/* buffer dimensions */
+	int width, height;
+	/* float buffer */
+	device_vector<float4> buffer;
+	/* random number generator state */
+	device_vector<uint> rng_state;
+	/* mutex, must be locked manually by callers */
+	thread_mutex mutex;
+
+	RenderBuffers(Device *device);
+	~RenderBuffers();
+
+	void reset(Device *device, int width, int height);
+
+protected:
+	void device_free();
+
+	Device *device;
+};
+
+/* Display Buffer
+ *
+ * The buffer used for drawing during render, filled by tonemapping the render
+ * buffers and converting to uchar4 storage. */
+
+class DisplayBuffer {
+public:
+	/* buffer dimensions */
+	int width, height;
+	/* dimensions for how much of the buffer is actually ready for display.
+	   with progressive render we can be using only a subset of the buffer.
+	   if these are zero, it means nothing can be drawn yet */
+	int draw_width, draw_height;
+	/* byte buffer for tonemapped result */
+	device_vector<uchar4> rgba;
+	/* mutex, must be locked manually by callers */
+	thread_mutex mutex;
+
+	DisplayBuffer(Device *device);
+	~DisplayBuffer();
+
+	void reset(Device *device, int width, int height);
+	void write(Device *device, const string& filename);
+
+	void draw_set(int width, int height);
+	void draw(Device *device);
+	bool draw_ready();
+
+protected:
+	void device_free();
+
+	Device *device;
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __BUFFERS_H__ */
+