Occulsion Query and RednerTraget texture

akira32

Can occlusion query calculate the changed pixel number in the RenderTraget texture that was SetrenderTarget in Drawing Function bracketed between the begin and end of Occulsion Query?

1. 
   
2. IDirect3DQuery9* pOcclusionQuery;
   
3. DWORD numberOfPixelsDrawn;
   
4. 
   
5. m_pD3DDevice->CreateQuery(D3DQUERYTYPE_OCCLUSION, &pOcclusionQuery);
   
6. 
   
7. // Add an end marker to the command buffer queue.
   
8. pOcclusionQuery->Issue(D3DISSUE_BEGIN);
   
9. 
   
10. // API render loop
    
11. ...
    
12. Draw(...) <<==Drawing Function, using SetRenderTarget
    
13. ...
    
14. 
    
15. // Add an end marker to the command buffer queue.
    
16. pOcclusionQuery->Issue(D3DISSUE_END);
    
17. 
    
18. // Force the driver to execute the commands from the command buffer.
    
19. // Empty the command buffer and wait until the GPU is idle.
    
20. while(S_FALSE == pOcclusionQuery->GetData( &numberOfPixelsDrawn,
    
21.                                   sizeof(DWORD), D3DGETDATA_FLUSH ))
    
22.     ;
    

复制代码

congy

Yes,GPU OQ hasn't any relation with rendertarget, it just amount the number of pixel be rendered in one DIP of d3d render pipeline..

akira32

Could you tell me where is you see the information about "amount the number of pixel be rendered in one DIP of d3d render pipeline"?
What is DIP? DrawIndexedPrimitive?