Cycles: Add support for rendering on Intel GPUs using oneAPI

This patch adds a new Cycles device with similar functionality to the
existing GPU devices.  Kernel compilation and runtime interaction happen
via oneAPI DPC++ compiler and SYCL API.

This implementation is primarly focusing on Intel® Arc™ GPUs and other
future Intel GPUs.  The first supported drivers are 101.1660 on Windows
and 22.10.22597 on Linux.

The necessary tools for compilation are:
- A SYCL compiler such as oneAPI DPC++ compiler or
  https://github.com/intel/llvm
- Intel® oneAPI Level Zero which is used for low level device queries:
  https://github.com/oneapi-src/level-zero
- To optionally generate prebuilt graphics binaries: Intel® Graphics
  Compiler All are included in Linux precompiled libraries on svn:
  https://svn.blender.org/svnroot/bf-blender/trunk/lib The same goes for
  Windows precompiled binaries but for the graphics compiler, available
  as "Intel® Graphics Offline Compiler for OpenCL™ Code" from
  https://www.intel.com/content/www/us/en/developer/articles/tool/oneapi-standalone-components.html,
  for which path can be set as OCLOC_INSTALL_DIR.

Being based on the open SYCL standard, this implementation could also be
extended to run on other compatible non-Intel hardware in the future.

Reviewed By: sergey, brecht

Differential Revision: https://developer.blender.org/D15254

Co-authored-by: Nikita Sirgienko <nikita.sirgienko@intel.com>
Co-authored-by: Stefan Werner <stefan.werner@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/intern/cycles/kernel/types.h b/intern/cycles/kernel/types.h
index ad022716207..f2e61d25002 100644
--- a/intern/cycles/kernel/types.h
+++ b/intern/cycles/kernel/types.h
@@ -1571,7 +1571,7 @@ static_assert_align(KernelShaderEvalInput, 16);
  * If the kernel uses shared CUDA memory, `CUDADeviceQueue::enqueue` is to be modified.
  * The path iteration kernels are handled in `PathTraceWorkGPU::enqueue_path_iteration`. */
 
-typedef enum DeviceKernel {
+typedef enum DeviceKernel : int {
   DEVICE_KERNEL_INTEGRATOR_INIT_FROM_CAMERA = 0,
   DEVICE_KERNEL_INTEGRATOR_INIT_FROM_BAKE,
   DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST,