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[Solved]Intel GMA 900 NOT support POSITIONT very well

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I am now making some post processing by rendering to target. It just render some background to a render taget texture and then render it back from a Quad to the back buffer. Much like a D3D sample named PostProcess. It works all right in many ATI and Nvidia Cards. But it always failed in Intel GMA 900/950 series card. I can not render the Quad back to the screen... I have checked texture format,render target size(pow 2 etc), depth buffer size,and depth test etc. Also, there is no error code found in the whole render loop. May anyone please give me some hints? Thanks alot! btw,I make 8 times of BeginScene() and EndScene() pairs before I present the backbuffer. Will it make some limit? [Edited by - NDD on June 26, 2007 10:14:08 PM]

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It because I render the Quad as Declare the Vertex Position as POSITIONT
x,y,z,rhw. And Some Intel GPU do NOT treat it well. After I use a POSITION(x,y,z)
vertex format and transform it myself, it now looks right.

These annoying cheap GMA 900s...

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