Am Mittwoch, 12. März 2008 09:46:25 schrieb Chris Robinson: I am not yet conviced that those patches are a good idea. Some time ago I found that I need the full half pixel to make DCT happy. Furthermore I see different behavior among drivers, e.g. my r200 driver doesn't need any correction(it rather hurts instead), and the nvidia driver behaves odd on very small render targets.
As I said on IRC, I am afraid that we have to do those position fixes per driver. In the extension detection we have to draw a few points onto the back buffer and read back the results, and then configure the offsets accordingly.
As I keep saying, we need proper tests for that. Your test to test the corner points is a good start, but we also have to test offscreen targets of different sizes(e.g. 1x1, 4x4, 16x16, ...), and we have to test all 3 codepaths(rhw, fixed function, shader).
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Stefan Dösinger