Cycles: add Optix device backend

This uses hardware-accelerated raytracing on NVIDIA RTX graphics cards.

It is still currently experimental. Most features are supported, but a few
are still missing like baking, branched path tracing and using CPU memory.
https://wiki.blender.org/wiki/Reference/Release_Notes/2.81/Cycles#NVIDIA_RTX

For building with Optix support, the Optix SDK must be installed. See here for
build instructions:
https://wiki.blender.org/wiki/Building_Blender/CUDA

Differential Revision: https://developer.blender.org/D5363

1 files changed, 7 insertions, 3 deletions

diff --git a/intern/cycles/blender/blender_python.cpp b/intern/cycles/blender/blender_python.cpp
index 2bea6b34772..335d4daf09c 100644
--- a/intern/cycles/blender/blender_python.cpp
+++ b/intern/cycles/blender/blender_python.cpp
@@ -81,6 +81,8 @@ bool debug_flags_sync_from_scene(BL::Scene b_scene)
   /* Synchronize CUDA flags. */
   flags.cuda.adaptive_compile = get_boolean(cscene, "debug_use_cuda_adaptive_compile");
   flags.cuda.split_kernel = get_boolean(cscene, "debug_use_cuda_split_kernel");
+  /* Synchronize OptiX flags. */
+  flags.optix.cuda_streams = get_int(cscene, "debug_optix_cuda_streams");
   /* Synchronize OpenCL device type. */
   switch (get_enum(cscene, "debug_opencl_device_type")) {
     case 0:
@@ -960,14 +962,16 @@ static PyObject *enable_print_stats_func(PyObject * /*self*/, PyObject * /*args*
 static PyObject *get_device_types_func(PyObject * /*self*/, PyObject * /*args*/)
 {
   vector<DeviceType> device_types = Device::available_types();
-  bool has_cuda = false, has_opencl = false;
+  bool has_cuda = false, has_optix = false, has_opencl = false;
   foreach (DeviceType device_type, device_types) {
     has_cuda |= (device_type == DEVICE_CUDA);
+    has_optix |= (device_type == DEVICE_OPTIX);
     has_opencl |= (device_type == DEVICE_OPENCL);
   }
-  PyObject *list = PyTuple_New(2);
+  PyObject *list = PyTuple_New(3);
   PyTuple_SET_ITEM(list, 0, PyBool_FromLong(has_cuda));
-  PyTuple_SET_ITEM(list, 1, PyBool_FromLong(has_opencl));
+  PyTuple_SET_ITEM(list, 1, PyBool_FromLong(has_optix));
+  PyTuple_SET_ITEM(list, 2, PyBool_FromLong(has_opencl));
   return list;
 }