sycl-rayt-test

Building the project (Linux/Ubuntu)

mkdir build && cd build

cmake .. -GNinja -DComputeCpp_DIR=/path/to/computecpp && ninja

Possible warning on compilation about the memcpy/memse intrinsics added by the llvm optimizer:

Building ComputeCpp integration header file /.../intel_sycl-rayt/build/sycl-rayt_sycl-rayt.cpp.sycl
remark: [Computecpp:CC0027]: Some memcpy/memset intrinsics added by the llvm optimizer were replaced by serial functions. This is a workaround for OpenCL drivers that do not support those intrinsics. This may impact performance, consider using -no-serial-memop. [-Rsycl-serial-memop]

ComputeCpp flag to avoid the above warning: -no-serial-memop.

Use with the cmake script as follows:

cmake .. -GNinja -DComputeCpp_DIR=/path/to/computecpp -DCOMPUTECPP_USER_FLAGS=-no-serial-memop

The cmake script will automatically target spir64, considering the platform supports SPIR.

If you wish to specify the SYCL Target manually, the sycl-target flag can be used.

Use with the cmake script as follows:

cmake .. -GNinja -DComputeCpp_DIR=/path/to/computecpp -DCOMPUTECPP_BITCODE=spir64

More information about the compiler options can be found here.

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Changing the selected SYCL/OpenCL device

Open src/sycl-rayt.cpp.

Look for this line of code:

auto queue = sycl::queue(sycl::gpu_selector{});

And change gpu_selector to cpu_selector (i.e).

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To write the raytraced image data to an image file (currently .ppm), use:

./sycl-rayt | tee output.ppm