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/blender/blender_python.cpp

@@ -0,0 +1,230 @@
+/*
+ * 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.
+ */
+
+#include <Python.h>
+
+#include "blender_sync.h"
+#include "blender_session.h"
+
+#include "util_opengl.h"
+#include "util_path.h"
+
+CCL_NAMESPACE_BEGIN
+
+static PyObject *init_func(PyObject *self, PyObject *args)
+{
+	const char *path;
+
+	if(!PyArg_ParseTuple(args, "s", &path))
+		return NULL;
+	
+	path_init(path);
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *create_func(PyObject *self, PyObject *args)
+{
+	Py_ssize_t pyengine, pydata, pyscene, pyregion, pyv3d, pyrv3d;
+
+	if(!PyArg_ParseTuple(args, "nnnnnn", &pyengine, &pydata, &pyscene, &pyregion, &pyv3d, &pyrv3d))
+		return NULL;
+
+	/* RNA */
+	PointerRNA engineptr;
+	RNA_pointer_create(NULL, &RNA_RenderEngine, (void*)pyengine, &engineptr);
+	BL::RenderEngine engine(engineptr);
+
+	PointerRNA dataptr;
+	RNA_id_pointer_create((ID*)pydata, &dataptr);
+	BL::BlendData data(dataptr);
+
+	PointerRNA sceneptr;
+	RNA_id_pointer_create((ID*)pyscene, &sceneptr);
+	BL::Scene scene(sceneptr);
+
+	PointerRNA regionptr;
+	RNA_id_pointer_create((ID*)pyregion, &regionptr);
+	BL::Region region(regionptr);
+
+	PointerRNA v3dptr;
+	RNA_id_pointer_create((ID*)pyv3d, &v3dptr);
+	BL::SpaceView3D v3d(v3dptr);
+
+	PointerRNA rv3dptr;
+	RNA_id_pointer_create((ID*)pyrv3d, &rv3dptr);
+	BL::RegionView3D rv3d(rv3dptr);
+
+	/* create session */
+	BlenderSession *session;
+
+	if(rv3d) {
+		/* interactive session */
+		int width = region.width();
+		int height = region.height();
+
+		session = new BlenderSession(engine, data, scene, v3d, rv3d, width, height);
+	}
+	else {
+		/* offline session */
+		session = new BlenderSession(engine, data, scene);
+	}
+	
+	return PyLong_FromVoidPtr(session);
+}
+
+static PyObject *free_func(PyObject *self, PyObject *args)
+{
+	Py_ssize_t pysession;
+
+	if(!PyArg_ParseTuple(args, "n", &pysession))
+		return NULL;
+
+	delete (BlenderSession*)pysession;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *render_func(PyObject *self, PyObject *args)
+{
+	Py_ssize_t pysession;
+
+	if(!PyArg_ParseTuple(args, "n", &pysession))
+		return NULL;
+	
+	Py_BEGIN_ALLOW_THREADS
+
+	BlenderSession *session = (BlenderSession*)pysession;
+	session->render();
+
+	Py_END_ALLOW_THREADS
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *draw_func(PyObject *self, PyObject *args)
+{
+	Py_ssize_t pysession, pyv3d, pyrv3d;
+
+	if(!PyArg_ParseTuple(args, "nnn", &pysession, &pyv3d, &pyrv3d))
+		return NULL;
+	
+	BlenderSession *session = (BlenderSession*)pysession;
+
+	bool draw_text = false;
+
+	if(pyrv3d) {
+		/* 3d view drawing */
+		int viewport[4];
+		glGetIntegerv(GL_VIEWPORT, viewport);
+
+		draw_text = session->draw(viewport[2], viewport[3]);
+	}
+	else {
+		/* image editor drawing */
+		draw_text = session->draw();
+	}
+
+	/* draw */
+	PyObject *ret = PyTuple_New(2);
+
+	if(!draw_text) {
+		PyTuple_SetItem(ret, 0, PyUnicode_FromString(""));
+		PyTuple_SetItem(ret, 1, PyUnicode_FromString(""));
+	}
+	else {
+		string status, substatus;
+
+		session->get_status(status, substatus);
+
+		PyTuple_SetItem(ret, 0, PyUnicode_FromString(status.c_str()));
+		PyTuple_SetItem(ret, 1, PyUnicode_FromString(substatus.c_str()));
+	}
+
+	return ret;
+}
+
+static PyObject *sync_func(PyObject *self, PyObject *args)
+{
+	Py_ssize_t pysession;
+
+	if(!PyArg_ParseTuple(args, "n", &pysession))
+		return NULL;
+
+	BlenderSession *session = (BlenderSession*)pysession;
+	session->synchronize();
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static PyObject *available_devices_func(PyObject *self, PyObject *args)
+{
+	vector<DeviceType> types = Device::available_types();
+
+	PyObject *ret = PyTuple_New(types.size());
+
+	for(size_t i = 0; i < types.size(); i++) {
+		string name = Device::string_from_type(types[i]);
+		PyTuple_SetItem(ret, i, PyUnicode_FromString(name.c_str()));
+	}
+
+	return ret;
+}
+
+static PyObject *with_osl_func(PyObject *self, PyObject *args)
+{
+#ifdef WITH_OSL
+	PyObject *ret = Py_True;
+#else
+	PyObject *ret = Py_False;
+#endif
+
+	return Py_INCREF(ret), ret;
+}
+
+static PyMethodDef methods[] = {
+	{"init", init_func, METH_VARARGS, ""},
+	{"create", create_func, METH_VARARGS, ""},
+	{"free", free_func, METH_VARARGS, ""},
+	{"render", render_func, METH_VARARGS, ""},
+	{"draw", draw_func, METH_VARARGS, ""},
+	{"sync", sync_func, METH_VARARGS, ""},
+	{"available_devices", available_devices_func, METH_NOARGS, ""},
+	{"with_osl", with_osl_func, METH_NOARGS, ""},
+	{NULL, NULL},
+};
+
+static struct PyModuleDef module = {
+	PyModuleDef_HEAD_INIT,
+	"libcycles_blender",
+	"Blender RNA to render exporter",
+	-1,
+	methods
+};
+
+CCL_NAMESPACE_END
+
+PyMODINIT_FUNC PyInit_libcycles_blender() 
+{
+	return PyModule_Create(&ccl::module);
+}
+