Emulator

I have the same graphics card as you, the latest revision and no problem with OpenCL.

Your drivers are old. Try updating them:

http://www.nvidia.com/object/win7-winvista-32bit-257.21-whql-driver.html

Sorry, not old, beta. That link is for the latest stable driver, which works for me.

If you want to try beta, update to 258.96 though.

I did not notice much difference with or without OpenCL, but when I stop the emulation, the emulator stops responding when it is active. I use Windows 7 64bit and my video card is ATI Radeon HD5870 1GB, latest driver.

I tried driver 257.21 whql and 258.96 that you mentioned and same problem with either set, opencl does not work properly even though GPU-Z says OpenCL works.

Were it not only possible with a driver from the 196.xx series?

Try the links belows.
http://forums.dolphin-emu.com/thread-4393-page-12.html
http://forums.dolphin-emu.com/thread-4393-page-13.html

driver 196.xx is not compatible with my card (GTX 470). Only driver 197.41 and above supports my card.

But this is not a driver issue because Dolphin built 5790 works PERFECTLY fine in OpenCL mode, no matter the driver version. Judging from reactions in the forum, other people seem to notice too that only new builts of Doplhin do not work in OpenCL

I am beginning to think it is the "CLRun" introduced in versions 58xx which is the source of the problem since builts prior to the implementation of CLRUn worked great.

Thank you agoso, I tried the jakeslogan patch from the link you gaveand now OpenCL works again!!!! This patch really should be added to the Dolphin svn!

"The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention."

This is what a debug build shows during run-time - more specifically, after calling any function from clrun.c (as well as clrungl.c, I guess). The crash is due to the stack (ESP) being unwinded twice (by the callee and the calling functions). NOPing (erasing) the instruction which unwinds ESP the second time causes the program to run normally, until the next CLRun call...

After searching/reading about calling conventions in C/C++, I found out that the function pointer is defaulted to _cdecl whereas the function call uses _stdcall (as defined by CL_API_CALL) - it's not the same! With the patch I posted below, I can run Dolphin with OpenCL without the crash upon initialization (using a 8800 GTS 512). Not sure about the improvements... But I hope this is the correct fix :P

By curiosity, what code did jakeslogan modify in its patched builds?

Oh, sorry I never thought of looking if it was a 32bit or 64bit build !
This fix is correct and should be applied as soon as possible. Since I'm on holidays, I can't do it but I'll bug the other devs for it.

Issue 2928 has been merged into this issue.

Issue 2900 has been merged into this issue.

Issue 2884 has been merged into this issue.

Issue 2884 has been merged into this issue.