"It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration."
- Edsger Dijkstra
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Query Failedfmoreira
Sunday, September 5, 2010

congratulations for your marriage Humus!
I wish the best for you two
r2d2Proton
Friday, August 20, 2010

Well, if Detours wasn't readily known at the time of need, I think this hack-trick was brilliant. Personally I haven't heard of Detours until you guys mentioned it below. Now I am going to be investigating it too. . .
deadc0de
Wednesday, August 18, 2010

Thatcher: I'm not 100% sure but I think the catch is that he's using SV_POSITION, and not a position copy ala DX9. I don't have a dx10 pc a home (well... I have a macbook) to confirm this and the sdk documentation is not clear, but googling seems to confirm that SV_POSITION is in viewport space.

I still agree that there is a lot of misinformation, i.e. on the way the hi-z works and on the benefits of using derivatives for post processing...
Barbie
Monday, August 9, 2010

I'm with GianT, I personally like detour for this kind of redirection. It works wonders, and is not limited to COM/vtable-enabled functions either: it actually patches the target method's implementation. It's brilliant! But it does require a little bit more setup than this otherwise fine hack.

A word of caution too, on the "copy more memory". While it's unlikely, copying arbitrary memory can
also result in a segfault, assuming you're at the end of the page...
GianT
Monday, August 9, 2010

You could also patch Win32 and COM functions with the help of a library like Detours. http://research.microsoft.com/en-us/projects/detours/

Also, this is very useful to intercept all calls to VirtualAlloc/VirtualFree, so you can monitor the memory allocations of your Windows build :-)
GianT
Monday, August 9, 2010

You could also patch Win32 and COM functions with the help of a library like Detours. http://research.microsoft.com/en-us/projects/detours/

Also, this is very useful to intercept all calls to VirtualAlloc/VirtualFree, so you can monitor the memory allocations of your Windows build :-)
eXile
Saturday, August 7, 2010

Thanks for the article! Somehow this approach reminds me of my old SSDT-hookinh implementations (except vtable-hooking is of course in user mode, not in kernel mode). Cartainly a nice approach to find out what exactly third-party libraries are doing under their hood
Humus
Friday, August 6, 2010

Axel,
well, that's more or less a summary of my last paragraph and I think the title of the post sort of set the right expectations. This is more intended as a hacking for fun than for actual measurable gains. I have another blog post coming up on a more practically usable v-table hacking technique.
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