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Ok, I found by myself :
Compiling opencv 2.4.5 + OCL : same result
Compiling AMD APP samples, always with Mingw : it runs... But with results like this :
Group Size specified : 256
Max Group Size supported on the kernel(writeKernel) : 128
Falling back to 128
Executing Kernels for 1 iterations
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So I suspect the actual opencv limitation to workgroup size to 256, because my GPU is a Radeon HD 5450, limited to 128.
Could you please tell me if there is any plan to add the feature to future version (2.4.6, 3.0 ??)
In a near future, will it be possible to call different OCL contexts at the same time too (from several threads) ?