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KatHan

Sprites in Direct3DX looked blurred - Transparent sprites lookin' bad.

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I''m trying to make a tiled game using D3DX and C++. Everything was going well until I got my voodoo 3 card working with it. OK, here''s what''s been giving me a migrane... I use color keying to display transparent sprites (I should use an alpha chanell, but I''m just trying to debug this first) Anyways, when I load a 32x32 sprite and display it in a 32x32 "square" on the screen, it looks blurred, almost as if it were enlarged or shrunk or something. You can understand what this does to my color values to certain transparent pixels. -_- But here''s the wierd thing... if I display the same 32x32 sprite at 31x31 or even 33x33, it comes out OK. o_O Of course this leaves little gaps between tiles. BTW: It''s not stretching the texture, if you tell it to put it in a 13x13 area, it puts down only a section of the texture... The surfacce itself hasn''t been altered. :/ I''ve read the documentation over and over, and I''m stuck. Could someone please give me some advice as how to correct this problem?

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I''m guessing that the blurring is caused because bilinear filtering is enabled. Try this:

lpD3DDevice->SetTextureStageState(0, D3DTSS_MAGFILTER, D3DTFG_POINT);
lpD3DDevice->SetTextureStageState(0, D3DTSS_MINFILTER, D3DTFN_POINT );

This will set D3D to use regular point sampling, which should get rid of any blurring.

--TheGoop

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