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Render to texture

Started by zxlop Oct 18, 2010 at 10:10 AM 2 replies 750+ views

Original Post

Oct 18, 2010 at 10:10 AM

I use
if(FAILED(g_pd3dDevice->CreateTexture(512 , 512 , 1 , D3DUSAGE_RENDERTARGET , D3DFMT_A8R8G8B8 , D3DPOOL_DEFAULT , &g_pRenderTexture , 0)))
to create a texture, then render the scene to it.
windows is:
HWND hWnd = CreateWindow("Render to Texture" , "Render to Texture"
, WS_OVERLAPPEDWINDOW , 0 , 0 , 640 ,480 , GetDesktopWindow()
, 0 , wndClass.hInstance , 0);

But the result is wrong.The scene is not rendered right.

But if I change the texture's width and hight to 256,256,
or increase window's width and hight more than 512 ,for example 1024,560,

the result is right.

How to explain this?

Evil Steve

382

Evil Steve

Oct 18, 2010 at 11:25 AM

What do you mean it's "wrong"? Can we get a screenshot?

What size is your backbuffer in your D3DPRESENT_PARAMETERS?

belfegor

128

belfegor

Oct 18, 2010 at 4:26 PM

your depth buffer surface has to be same size (or larger) as your render target!
i bet that you are using default depth buffer:

PresentParams.EnableAutoDepthStencil                  = TRUE;

witch creates default depth buffer with size: 640x480
create another depth buffer surface and use it along with your rt:

dev->SetRenderTarget(0, yourRT);dev->SetDepthStencilSurface(yourNewDepthBuffer);dev->Clear(...);

belfegor

128

belfegor

Oct 18, 2010 at 4:38 PM

when testing your projects always enable d3d debugging:

#define D3D_DEBUG_INFO // define at top...#include <d3d9.h>#include <d3dx9.h>#pragma comment (lib, "d3d9.lib")#pragma comment (lib, "d3dx9d.lib")

and use dx control panel.

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