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Subloading a texture

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What I am basically trying to do is paint a smaller texture onto a larger texture using D3DXLoadSurfaceFromSurface. I have a base floor texture (LPDIRECT3DTEXTURE9) with a snow texture on it and I am trying to paint dirt patches onto it in various places. It works fine except that it paint the entire dirt picture onto it and ignores the alpha areas. The last parameter of the D3DXLoadSurfaceFromSurface function is supposed to be a color to use as the alpha channel but I cannot get it to work at all. Any help would be much appreciated. -Chris

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That alpha parameter is used to set alpha values in the loaded texture. D3DXLoadSurfaceFromSurface is not a rendering call and as such does not use alphablending.

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