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Detect debug run-time

Started by eq Nov 24, 2004 at 11:25 AM 4 replies 550+ views

Original Post

Nov 24, 2004 at 11:25 AM

I'd like to detect if the user uses the debug runtime or not. I'm doing some lowlevel stuff (read assembly) and the two differs. For instance: A SetTexture call using the debug-runtime destroys one extra element of the stack, etc. Is there a "nice" way to detect if it's a debug-runtime? (It's quite simple to detect knowing the above is true, for instance).

darookie

121

darookie

Nov 24, 2004 at 11:31 AM

Query the registry: HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\Direct3D\LoadDebugRuntime
[edit]
The value is a DWORD and non-zero if the debug runtime is active[smile]
[/edit]

Author

Nov 24, 2004 at 11:54 AM

If I create a device and then switches the debug/release runtime, does it change the device behavior of the running app?

For instance start an application using one device using release runtime, marking my device as release. Then switch to debug runtime. Do I need to test for changes in the registry key or can I assume that once a device is created it uses the same runtime?

Currently I'm using this "hack":

boolisDebugRuntime(IDirect3DDevice9* const dev){//	Warning! Does a SetTexture(0, null)	IDirect3DDevice9* device = dev;	uint callAddress = *((DWORD*)(*((u8**)device) + 0x104));	__asm	{		push 0		push 0		push device		call callAddress		push DWORD PTR [esp - 12]		pop DWORD PTR device	};	return (device != dev);}

Author

Nov 24, 2004 at 12:00 PM

Well I tested, it seems that once a device is created in an app, it usese the same runtime.

darookie

121

darookie

Nov 24, 2004 at 12:04 PM

Quote:
Original post by eq
Well I tested, it seems that once a device is created in an app, it usese the same runtime.

It has to. Otherwise the device would have to be destroyed and re-created, which is something an application cannot know about (e.g. the device isn't just 'lost' but completely trashed and reset).

darookie

121

darookie

Nov 24, 2004 at 12:07 PM

Regarding your hack: don't do that! You rely on an undocumented behaviour that may change at any time without notice. Use the documented and reliable methods (like the registry key) unless there are no other options.

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