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\section{OpenCL-based Actors}
CAF supports transparent integration of OpenCL functions.
\begin{lstlisting}
// opencl kernel for matrix multiplication;
// last parameter is, by convention, the output parameter
constexpr const char* kernel_source = R"__(
__kernel void matrix_mult(__global float* matrix1,
__global float* matrix2,
__global float* output) {
// we only use square matrices, hence: width == height
size_t size = get_global_size(0); // == get_global_size_(1);
size_t x = get_global_id(0);
size_t y = get_global_id(1);
float result = 0;
for (size_t idx = 0; idx < size; ++idx)
result += matrix1[idx + y * size] * matrix2[x + idx * size];
output[x + y * size] = result;
}
)__";
\end{lstlisting}
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