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POUnderstanding behaviour of global id in OpenCL
 

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  1. POUnderstanding behaviour of global id in OpenCL
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    <p>OpenCL newbie question</p> <p>I'm trying to write a kernel to perform some task over rectangular regions of an image. </p> <p>OpenCL</p> <pre><code>__kernel void GrayBlockSignalSeparation ( __global float * rhos ) { const int neighbourhoodSize = 60; const int x = get_global_id(0); const int y = get_global_id(1); rhos[x - 1 + (y-1)*(neighbourhoodSize) ] = x; } </code></pre> <p>C#</p> <pre><code>private static void GraySignalSeparation ( ref Image&lt;Gray, float&gt; Signal ) { float[] rhos = new float[(int)(image.Width / 60) * (int)(image.Height / 60)]; CLCalc.Program.Variable rhosVar = new CLCalc.Program.Variable(rhos); CLCalc.Program.MemoryObject[] args = new CLCalc.Program.MemoryObject[] { rhosVar }; GraySignalSeparationKernel.Execute(args, new int[] { (int)(image.Width / 60), (int)(image.Height / 60) }); rhosVar.ReadFromDeviceTo(rhos); } </code></pre> <p>When I inspect the rho values in the debugger I find that some of them appear to have been missed and are set to zero.</p> 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11 [371] 12 [372] 13 [373] 14 [374] 15 [375] 16 [376] 17 [377] 18 [378] 19 [379] 20 [380] 21 [381] 22 [382] 23 [383] 24 [384] 25 [385] 26 [386] 27 [387] 28 [388] 29 [389] 30 [390] 31 [391] 0 [392] 0 [393] 0 [394] 0 [395] 0 [396] 0 [397] 0 [398] 0 [399] 0 [400] 0 [401] 0 [402] 0 [403] 0 [404] 0 [405] 0 [406] 0 [407] 0 [408] 0 [409] 0 [410] 0 [411] 0 [412] 0 [413] 0 [414] 0 [415] 0 [416] 0 [417] 0 [418] 0 [419] 0 [420] 1 [421] 2 [422] 3 [423] 4 [424] 5 [425] 6 [426] 7 [427] 8 [428] 9 [429] 10 [430] 11 [431] 12 [432] 13 [433] 14 [434] 15 [435] 16 [436] 17 [437] 18 [438] 19 [439] 20 [440] 21 [441] 22 [442] 23 [443] 24 [444] 25 [445] 26 [446] 27 [447] 28 [448] 29 [449] 30 [450] 31 [451] 0 [452] 0 [453] 0 [454] 0 [455] 0 [456] 0 [457] 0 [458] 0 [459] 0 [460] 0 [461] 0 [462] 0 [463] 0 [464] 0 [465] 0 [466] 0 [467] 0 [468] 0 [469] 0 [470] 0 [471] 0 [472] 0 [473] 0 [474] 0 [475] 0 [476] 0 [477] 0 [478] 0 [479] 0 [480] 1 [481] 2 [482] 3 [483] 4 [484] 5 [485] 6 [486] 7 [487] 8 [488] 9 [489] 10 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