[OpenCL 1.2 C++ Tutorials 6/9] - Hello World! Full example
Why Stack Overflow recommends it
Stack Overflow users link it as the Hello World walkthrough they followed when learning OpenCL C++, and then cite it when their own copy of the example fails with errors like invalid kernel, invalid context, or garbled output.
Recommended by 0 people across 0 different months, 2017 to 2022.
What it is
A 16-minute tutorial from Wesley Shillingford, part 6 of a 9-part OpenCL 1.2 C++ series, that builds a complete Hello World OpenCL program from start to finish. It walks through the host code, kernel, and buffer handling using the C++ bindings.
What people said
Cites user6782588 · 2017-10 · Stack Overflow · on “Where am I going wrong with openCL and the "Failed to set kernel argument" failure?”
I've been trying following a [this video] to create a simple hello world program utilising opencl. It was building fine until I have to call the kernel then it says the following... "2017-10-14 11:43:33.049472+0100 openclTest3[1052:70809] [CL_INVALID_KERNEL] : OpenCL Error : Failed to set kernel argument! Kernel given is invalid!" Where am I going wrong? I have been over the tutorial code several times. Used someone else's code from the same tutorial, and looked at all the similar questions on here that i could find. As far as I can see there is no difference in the code. I am using a late 2013 mbp with Intel Iris Pro graphics. I have linked the opencl framework in Xcode. I have 3 files main.cpp,
Cites movermeyer · 2018-04 · Stack Overflow · on “OpenCL 2.1 C++ HelloWorld: invalid context?”
Similar to this question [LINK] , I'm trying to implement the HelloWorld example from this video [this video] by Wesley Shillingford, except this time with OpenCL 2.1. I can get it to run if I use the default context, but not if I create my own (as the video does). When I use my own context, it produces a cl::Error (-34 = CL_INVALID_CONTEXT): From here [LINK] : CL_INVALID_CONTEXT = the given context is invalid OpenCL context, or the context associated with certain parameters are not the same. I'm not sure how I could tell that the context is invalid. I've tried comparing the defaultContext to myContext , and they match of everything except CL_CONTEXT_REFERENCE_COUNT . Which doesn't seem to matter
Cites IGK · 2020-06 · Stack Overflow · on “OpenCL kernel does not return character data to the host program”
I am new to OpenCL and learn it from Matthew Scarpino's “OpenCL in Action” [LINK] . I examined an example of matrix multiplication by a vector (p. 11-13). For some reason, the example did not work on my computer. The kernel did not return the values. I began to look for simple examples of outputting data from the kernel. I found in Wesley Shillingford’s youtube channel an example [this video] of outputting the string of characters “Hello world!” from the kernel. On my home computer, the example worked. However, the OpenCL "kitchen" has remained closed since the example presented was written in C++. The brevity of the code obscured the concept of what is happening. So I began to look further for e
Cites maxet24 · 2022-01 · Stack Overflow · on “OpenCL C++ HelloWorld”
Good afternoon! I am learning OpenCL C++ in this tutorial: Click [this video] (it's not necessary) The video uses CL API version 1.2 , so I downloaded the OpenCL 1.2 headers from the link in this reply: [LINK] Visual Studio 2022 shows no errors, but the program outputs these symbols: ╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠ It's supposed to say "Hello World!" . Here is the program itself. Host: #define CL_USE_DEPRECATED_OPENCL_1_2_APIS #include <CL/cl.hpp> #include <iostream> #include <fstream> int main() { std::vector<cl::Platform> platforms; cl::Platform::get(&platforms); auto platform = platforms.front(); std::vector<cl::Device> devices; platform.getDevices(CL_DEVICE_TYPE_ALL, &devices