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OpenCL

sandyandr
Adept I
Adept I
‎11-05-2013 06:12 AM

Image access

I have two kernels. One of them writes (only) some image. Other - only reads it. Host has no business here. Is there any possibility to switch image access mode from read_only to write_only without image destruction/recreation between different kernel executions? I know, that I should better use read_write or even buffers for such tasks, but performance level is important - I want to use cache if there is any possibility to speed up the code with it here.

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nou
Exemplar
Exemplar
‎11-05-2013 01:09 PM

Re: Image access

yes you can specify image with __read_only qualifiers and __write_only in second one. then you must pass CL_READ_WRITE flag into clCreateImage() function.

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sandyandr
Adept I
Adept I
‎11-05-2013 11:25 PM

Re: Image access

Thank you. By the way, where could I find information about exact cache dependancies on specified kernel qualifiers and image flags? Also, can't find the new AMD APP OCL Programming Guide (august revision - the last one?).

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pinform
Staff
Staff
‎12-13-2013 02:09 AM

Re: Image access

The latest AMD APP OpenCL Programming Guide is here: http://developer.amd.com/wordpress/media/2013/07/AMD_Accelerated_Parallel_Processing_OpenCL_Programm...

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