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OpenGL drawing a section of a bitmap

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Hi, i am trying to convert an existing lib(GDI) to opengl. BITMAPINFO *BInfo; GLubyte *BBits; i have the bitmap and i can draw this using gldrawpixels.But i cant find a way to select a source rectangle in the bitmap and draw it. (it was done using StretchDIBits in the old lib) Any ideas? Thanks in advance, mete

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