Hmm okay.
Could I replace the BeginScene() and EndScene() functions with my own somehow?
What I'm at right now: Those functions are defined as COM IDirect3DDevice9 interface functions. pd3ddev holds a pointer to that device/ interface ("d3d9.h") at runtime. The functions are stored in a lpVtbl table but I can ignore that in lite-C.
The function address is ((LPDIRECT3DDEVICE9)pd3ddev)->BeginScene (?). I can save that and replace it with my own function (?). This leads me to a code as follows:
Click to reveal..
Code:
HRESULT BeginSceneOld(void *This);
HRESULT EndSceneOld(void *This);
HRESULT EndSceneKu(void *This);
HRESULT BeginSceneKu(void *This)
{
	cprintf1("nBeginSceneKu at frame %d",(int)total_frames);
	LPDIRECT3DDEVICE9 pd3dDevKu = (LPDIRECT3DDEVICE9)pd3ddev;
	return BeginSceneOld(pd3dDevKu); //pd3dDevKu->lpVtbl->
}

HRESULT EndSceneKu(void *This)
{
	cprintf1("nEndSceneKu at frame %d",(int)total_frames);
	LPDIRECT3DDEVICE9 pd3dDevKu = (LPDIRECT3DDEVICE9)pd3ddev;
	return EndSceneOld(pd3dDevKu);
}

void main()
{
	fps_max = 60;
	level_load(NULL);
	wait(1);
	LPDIRECT3DDEVICE9 pd3dDevKu = (LPDIRECT3DDEVICE9)pd3ddev;
	BeginSceneOld = pd3dDevKu->BeginScene;
	pd3dDevKu->BeginScene = BeginSceneKu;
	EndSceneOld = pd3dDevKu->EndScene;
	pd3dDevKu->EndScene = EndSceneKu;
}

Probably an absolute mess to everyone who knows what they are doing. This leads to a script crash after the first execution of BeginSceneKu (does not close the program) - returning the old BeginSceneOld() (with or without parameter) is correct, right?
I'm guessing the fact that I'm dealing with an interface is leading to a crash ("this" not working right for me/ ...).

I can code it even worse though, that is switch around function pointers in every Begin/EndScene call:
Click to reveal..
Code:
HRESULT BeginSceneKu(void *This)
{
	cprintf1("nBeginSceneKu at frame %d",(int)total_frames);
	LPDIRECT3DDEVICE9 pd3dDevKu = (LPDIRECT3DDEVICE9)pd3ddev;
	pd3dDevKu->EndScene = EndSceneKu;
	pd3dDevKu->BeginScene = BeginSceneOld;
	return pd3dDevKu->BeginScene();
}

HRESULT EndSceneKu(void *This)
{
	cprintf1("nEndSceneKu at frame %d",(int)total_frames);
	LPDIRECT3DDEVICE9 pd3dDevKu = (LPDIRECT3DDEVICE9)pd3ddev;
	pd3dDevKu->BeginScene = BeginSceneKu;
	pd3dDevKu->EndScene = EndSceneOld;
	return pd3dDevKu->EndScene();
}

This prints both functions to the console "at frame 1", then waits a second and closes the program without error message.

Could I easily hook those functions somehow (to let's say put a WaitForSingleObject(MUTEX) in BeginScene and a release in EndScene)?

Thanks!

EDIT: If I wait for more than 1 frame at the start of the main function my pointer shenanigans don't seem to have any effect, the game runs as normal but doesn't print anything to the console either. confused

Last edited by Superku; 07/20/18 16:19.
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