Hi,
In radeonUpdateWindow and radeonUpdateViewportOffset functions in radeon_state.c `tx' and `ty' values are calculated differently. In UpdateWindow SUBPIXEL_X|Y values are added and in UpdateViewportOffset it's not and compared to values which might have been calculated in former function. The same goes for r200 driver.
BTW: What is SUBPIXEL_X|Y exactly used for?
Adjusting pixel centers to match the GL spec. They should be added in both places.
Keith
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