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blinking triangle in D3DIM :(

Started by Xeno Sep 2, 2000 at 6:58 AM 15 replies 950+ views

Original Post

Sep 2, 2000 at 6:58 AM

hi! i just started my new game project , and for the start i just initialized ddraw & d3dim and tried to render a rectangle with texture on him to see if everything goes well, and for my supraise it (the rectange) started to blink with the background color , its so strange it never happened to me , u can see how it looks like: its just 32KB Download it (if u cant download it with getright or program liek that download it with your own browser , in IE: right click and "save target as...") umm... can u think on the problem? what am i doing wrong? "Everything you know is wrong" - Bono Edited by - xeno on 9/2/00 7:07:10 AM Edited by - xeno on 9/2/00 8:28:37 AM

Xeno

Sep 2, 2000 at 7:40 AM

anyone?

Quantum

Sep 2, 2000 at 7:48 AM

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Xeno

Sep 2, 2000 at 8:30 AM

ok , now try to download it again , please!

download it with your own browser:
with IE: right click - and then "save target as..."

thanks a lot!

MatsG

Sep 2, 2000 at 8:32 AM

Forgot the D3Ddevice->BeginScene(); and D3Ddevice->EndScene()?

Xeno

Sep 2, 2000 at 8:39 AM

no i didnt

how could i render this without it?

MatsG

Sep 2, 2000 at 8:50 AM

Usally blinks alot when you forgot that, done that several times =) Post your render loop

Xeno

Sep 2, 2000 at 8:54 AM

this is my render function:

    
void Render(D3DTLVERTEX *vrtx,int num_of_vrtx)
{

	lp_device->Clear(0,NULL,D3DCLEAR_TARGET,RGB_MAKE(128,128,128),0.0f,0);

	lp_device->SetTexture(0,lp_tex);

	if(lp_device->BeginScene())
	{
		lp_device->DrawPrimitive(D3DPT_TRIANGLESTRIP,D3DFVF_TLVERTEX,vrtx,num_of_vrtx,0);
		lp_device->SetTexture(0,NULL);
		lp_device->EndScene();
	}
}

X-Man

Sep 2, 2000 at 8:57 AM

Back buf not updated for each flip?

Xeno

Sep 2, 2000 at 9:01 AM

sure it does , im doing flipping in the UpdateFrame() procedure

Xeno

Sep 2, 2000 at 9:04 AM

when i replace this line:
if(lp_device->BeginScene())

with this:
if(SECCEEDED(lp_device->BeginScene()))

it almost not blinking , but still there is some blinking in some parts of the image , dunno why...

Xeno

Sep 2, 2000 at 9:38 AM

anyone have more idea?

Xeno

Sep 2, 2000 at 10:02 AM

i have no Z-Buffer
thanks anyway

Facehat

Sep 2, 2000 at 10:41 AM

I''m almost certain it has to do with how you''re updating the screen. It looks like you are only drawing it every other frame. Could you post your screen update code?

----------------------------------------
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Xeno

Sep 2, 2000 at 10:49 AM

    
void Render(D3DTLVERTEX *vrtx,int num_of_vrtx)
{

	lp_device->Clear(0,NULL,D3DCLEAR_TARGET,RGB_MAKE(128,128,128),0.0f,0);

	lp_device->SetTexture(0,lp_tex);

	if(SUCCEEDED(lp_device->BeginScene()))
	{
		lp_device->DrawPrimitive(D3DPT_TRIANGLESTRIP,D3DFVF_TLVERTEX,vrtx,num_of_vrtx,0);
		lp_device->SetTexture(0,NULL);
		lp_device->EndScene();	
	}


}

void UpdateFrame(void)
{
	HRESULT hRet;

	while(TRUE)
	{
		hRet = lp_primary->Flip(0,DDFLIP_WAIT);

		if(hRet == DD_OK)
			break;

		if(hRet == DDERR_SURFACELOST)
		{
			hRet = RestoreAll();
			if(hRet != DD_OK)
				break;
		}

		if(hRet != DDERR_WASSTILLDRAWING)
			break;
	}

}

[/source]

[source]    
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
				   LPSTR lpCmdLine,int nCmdShow)
{
	MSG msg;
	HWND hWnd;
	WNDCLASS wc;

	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.hCursor = LoadCursor(hInstance,IDC_ARROW);
	wc.hIcon = NULL;
	wc.hInstance = hInstance;
	wc.lpfnWndProc = (WNDPROC) WndProc;
	wc.lpszClassName = app_name;
	wc.lpszMenuName = app_name;
	wc.style = CS_VREDRAW | CS_HREDRAW;

	RegisterClass(&wc);

	hWnd = CreateWindowEx(NULL,app_name,app_title,WS_POPUP,
						  0,0,0,0,NULL,NULL,hInstance,NULL);

	if(!hWnd)
		return 0;

	ShowWindow(hWnd,nCmdShow);
	UpdateWindow(hWnd);
	SetFocus(hWnd);

	while(1)
	{
		if(PeekMessage(&msg,NULL,0,0,PM_NOREMOVE))
		{
			if(!GetMessage(&msg,NULL,0,0))
				return msg.wParam;
			TranslateMessage(&msg);
			DispatchMessage(&msg);	
		}
		else if(ready)
		{

			d3d_vrtx[0] = D3DTLVERTEX(D3DVECTOR(0,0,0),1.0,RGBA_MAKE(255,255,255,0),0,0,0);
			d3d_vrtx[1] = D3DTLVERTEX(D3DVECTOR(256,0,0),1.0,RGBA_MAKE(255,255,255,0),0,1,0);
			d3d_vrtx[2] = D3DTLVERTEX(D3DVECTOR(0,128,0),1.0,RGBA_MAKE(255,255,255,0),0,0,1);
			d3d_vrtx[3] = D3DTLVERTEX(D3DVECTOR(256,128,0),1.0,RGBA_MAKE(255,255,255,0),0,1,1);

			Render(d3d_vrtx,4);

			UpdateFrame();

		}
		else
		{
			WaitMessage();
		}
	}
}

thats how im updating the screen

Edited by - xeno on September 2, 2000 11:54:01 AM

Xeno

Sep 2, 2000 at 11:45 AM

nevermind guys , tornado helped me and its working great , thanks anyway

the problem was because i create my primary surface as the render target instead of the back buffer (ops

)

Edited by - xeno on September 2, 2000 12:48:34 PM

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