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POopenCL - difference in handling array and scalar
 

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  1. POopenCL - difference in handling array and scalar
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    <p>I'm trying to dig into openCL. At the moment I'm asking myself why a scalar differs from array when it comes to transferring to GPU.</p> <p>Below there are two inputs. A scalar and a array. Why is there such a big difference in transferring them to the GPU?</p> <p>Thanks in advance!</p> <pre><code>// input size int input_size = 4; err = clSetKernelArg(kernel, 0, sizeof(unsigned int), &amp;_input_size); if (err != CL_SUCCESS) { throw std::runtime_error("Failed to set kernel arguments!"); } // input int input[input_size]; input[0] = 1; input[1] = 2; input[2] = 3; input[3] = 4; cl_mem cl_input = clCreateBuffer(context, CL_MEM_READ_ONLY, sizeof(int) * _input_size, NULL, NULL); if (!cl_input) { throw std::runtime_error("Failed to allocate device memory!"); } err = clSetKernelArg(kernel, 1, sizeof(cl_mem), &amp;cl_input); if (err != CL_SUCCESS) { throw std::runtime_error("Failed to set kernel arguments!"); } err = clEnqueueWriteBuffer(commands, cl_input, CL_TRUE, 0, sizeof(int) * _input_size, _input, 0, NULL, NULL); if (err != CL_SUCCESS) { throw std::runtime_error("Failed to write to source array!"); } // output int output_size = 4; int output[output_size]; cl_mem cl_output = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(int) * _output_size, NULL, NULL); if (!cl_output) { throw std::runtime_error("Failed to allocate device memory!"); } err = clSetKernelArg(kernel, 2, sizeof(cl_mem), &amp;cl_output); if (err != CL_SUCCESS) { throw std::runtime_error("Failed to set kernel arguments!" ); } </code></pre>
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    1. COI'm not sure yet but I'm pretty sure it's because an array is not a scalar. On a serious note, I have absolutely no clue what you are asking.
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    2. COI wanna try to write some c++ templated insert functions to handle in-/output to/from opencl in background. If a array needs other treatment than scalar my template function idea is not realisable.
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