Re: Tearing in Direct3D with TFT/LCD-Display
- From: "Stephan Schaem" <sschaem@xxxxxxxxxxxxxxxxx>
- Date: Sun, 18 Sep 2005 16:49:33 -0700
Dx9 doesn't support VSync in windowed mode if you cant guaranty that you can
render a frame faster then the monitor refresh.
In short if you run at 60hz , you will need to have a scene that can render
at 60+ FPS.
The workaround is build your own Present() call wrapper.
Stephan
"Alexander Gräf" <Graef@xxxxxxxxxxxxxxxx> wrote in message
news:1125256697.40440.0@xxxxxxxxxxxxxxxxxxxx
> Hello NG,
>
> I'm having problems with tearing while rendering a Direct3D-scene. The
> graphics adapter is an ATI RADEON X800 Pro, and the TFT is 20" (1600x1200
> @ 60Hz), connected via DVI. I'm using Windows XP SP2 with DirectX 9.0c
> (4.09.000.0904).
>
> I already tried several things to get the tearing away:
>
> ATI Control Panel:
> Enabled and disabled VSYNC for Direct3D (and yes, I'm using the latest
> display drivers), which made a difference in the dxdiag-demo-cube, but not
> in my application
>
> In my source:
> Various BackBufferCount- and PresentationInterval-values
> (slightly different, but cannot tell if better or worse)
>
> Windowed vs FullScreen
> (didnt made any difference)
>
> However, no matter what I configure, the screen tearing stays, this means
> I can see one half of the first frame, and the other half of the next
> frame, splitted in the middle every few seconds. Here is the full device
> initialization:
>
> =========================================
> // Retrieve the adapter for the X3D-display
> UINT uiAdapter=FindAdapter(GetDisplayRect());
> if (uiAdapter==-1) return HRESULT_FROM_WIN32(ERROR_BAD_UNIT);
>
> // Aquire Direct3D adapter display mode
> D3DDISPLAYMODE displayMode;
> hr=m_pDirect3D->GetAdapterDisplayMode(uiAdapter, &displayMode);
> if (FAILED(hr)) return hr;
>
> // Set Direct3D-device presentation parameters
> D3DPRESENT_PARAMETERS presentParams={0};
> presentParams.Windowed=TRUE; // Present in windowed mode
> presentParams.SwapEffect=D3DSWAPEFFECT_DISCARD; // Avoid copy-overhead for
> back-buffer
> presentParams.BackBufferFormat=displayMode.Format;
> presentParams.BackBufferWidth=m_x3dDisplayInfo.scWpx;
> presentParams.BackBufferHeight=m_x3dDisplayInfo.scHpx;
> presentParams.BackBufferCount=2;
> presentParams.hDeviceWindow=m_renderWnd.GetWindowHWND();
> presentParams.PresentationInterval=D3DPRESENT_INTERVAL_DEFAULT;
> presentParams.EnableAutoDepthStencil=FALSE;
>
> // Get the owner window
> OAHWND oahWndOwner;
> hr=m_renderWnd.get_Owner(&oahWndOwner);
> HWND hWndOwner=(oahWndOwner&&SUCCEEDED(hr))?
> ((HWND)oahWndOwner):(m_renderWnd.GetWindowHWND());
>
> // Retrieve the device from Direct3D
> hr=m_pDirect3D->CreateDevice(uiAdapter, D3DDEVTYPE_HAL, hWndOwner,
> D3DCREATE_HARDWARE_VERTEXPROCESSING, &presentParams, &m_pDevice);
> if (FAILED(hr)) return hr;
>
> // Error handling left out for clarity, but all methods succeed
> // Set rendering parameters (Stage 0, mask texture)
> hr=m_pDevice->SetTextureStageState(0, D3DTSS_TEXCOORDINDEX, 0);
> hr=m_pDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_NONE);
> hr=m_pDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_NONE);
> hr=m_pDevice->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_WRAP);
> hr=m_pDevice->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_WRAP);
> hr=m_pDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_TEXTURE);
> hr=m_pDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG2);
>
> // Set rendering parameters (Stage 1, video texture)
> hr=m_pDevice->SetTextureStageState(1, D3DTSS_TEXCOORDINDEX, 1);
> hr=m_pDevice->SetSamplerState(1, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
> hr=m_pDevice->SetSamplerState(1, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
> hr=m_pDevice->SetTextureStageState(1, D3DTSS_COLORARG1, D3DTA_CURRENT);
> hr=m_pDevice->SetTextureStageState(1, D3DTSS_COLORARG2, D3DTA_TEXTURE);
> hr=m_pDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_MODULATE);
>
> // Set rendering parameters (general)
> hr=m_pDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
> hr=m_pDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_ONE);
> hr=m_pDevice->SetRenderState(D3DRS_ZENABLE, D3DZB_FALSE);
> hr=m_pDevice->SetRenderState(D3DRS_FILLMODE , D3DFILL_SOLID);
> hr=m_pDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_FLAT);
> hr=m_pDevice->SetRenderState(D3DRS_ZWRITEENABLE, FALSE);
> hr=m_pDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
> hr=m_pDevice->SetRenderState(D3DRS_ZFUNC, D3DCMP_ALWAYS);
> hr=m_pDevice->SetRenderState(D3DRS_CLIPPING, FALSE);
> hr=m_pDevice->SetRenderState(D3DRS_COLORVERTEX, FALSE);
> hr=m_pDevice->SetRenderState(D3DRS_LOCALVIEWER, FALSE);
> hr=m_pDevice->SetRenderState(D3DRS_MULTISAMPLEANTIALIAS, FALSE);
> =========================================
>
> The rendering itself is quite simple, I have two textures and one vertex
> buffer with 16 triangles, which blend together into one frame:
>
> =========================================
>
> // We do not use the stencil or Z-buffer
> hr=m_pDevice->Clear(0, NULL, D3DCLEAR_TARGET,0,1,0);
> if (FAILED(hr)) return hr;
>
> hr=m_pDevice->BeginScene();
> if (FAILED(hr)) return hr;
>
> if (m_pLastTexture!=pTexSample->m_pTexture.p)
> {
> hr=m_pDevice->SetTexture(1, pTexSample->m_pTexture);
> if (FAILED(hr)) return hr;
> m_pLastTexture=pTexSample->m_pTexture.p;
> }
>
> // Triangle strip is not possible because triangles are only partially
> connected
> // Vertex buffer contains 16 triangles (Views = 8) with
> // format D3DFVF_XYZRHW|D3DFVF_TEX2
> hr=m_pDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, Views*2);
> if (FAILED(hr)) return hr;
>
> hr=m_pDevice->EndScene();
> if (FAILED(hr)) return hr;
>
> hr=m_pDevice->Present(NULL, NULL, NULL, NULL);
> if (FAILED(hr)) return hr;
> =========================================
>
> One thing I should note: The main texture is dynamic and gets updated by
> video frames received from a video decoder. After each receiving, the
> render function above is called to draw the new frame. Thus, the frame
> rate never gets above ~25 fps, because that's the rate at which samples
> arrive from the decoder. The whole thing is implemented as a DirectShow
> video renderer filter.
>
> Any help is appreciated.
>
> Regards, Alexander Gräf
>
>
.
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