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soarsky

A question about direct input.

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Hi,now I have a trouble to get mouse state: When I move the mouse slowly, it can get position well. But when I move it too quickly, it will lose some offset. What is my wrong and how to correct it? Please look at the following codes: LRESULT WINAPI MsgProc(HWND hWnd,UINT msg,WPARAM wParam, LPARAM lParam) { switch (msg) { case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hWnd,msg,wParam,lParam); } INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR, INT) { ... if (GameInit()) { ShowWindow(hWnd,SW_SHOWDEFAULT); UpdateWindow(hWnd); MSG msg; ZeroMemory(&msg,sizeof(msg)); while( msg.message != WM_QUIT ) { if (PeekMessage(&msg,NULL,0U,0U,PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg); } if (!GameMain()) break; } GameCleanup(); } ... } bool GameMain() { ... //get device input if (pdi) { DIMOUSESTATE mouseState; if (!ReadInput(keyboardState,&mouseState)) return false; ... } //render if (GetTickCount()-iStartTime > 33) { iStartTime = GetTickCount(); if (!Render()) return false; } ... } bool ReadInput(byte *keyboardState,DIMOUSESTATE *mouseState) { ZeroMemory( keyboardState, sizeof(keyboardState) ); ZeroMemory( mouseState, sizeof(DIMOUSESTATE) ); if (FAILED(m_pMouse->GetDeviceState(sizeof(DIMOUSESTATE),mouseState))) { m_pMouse->Acquire(); return false; } ... }

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the reason is because there is something called the 'dead zone' (or something similar) which basically is an amount of input directinput will intentionally ignore/ for ps2 I know the default is 2% of input will be ignored because otherwise the game gets very jumpy due to any slight movement of the analog sticks. I think most people actually set the dead zone value to around 7 - 10%. there is a DirectInput function for doing this but i don't remember it off the top of my head...anyone else know it?

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