Has anyone else experienced problems reading back depth values with the r200 driver?
Whenever I read back a depth value from the right part (about a seventh or eighth of the width) I get 1.0.
Reading back from other parts of the buffer works OK as does software Mesa everywhere.
There is an extensive calculation to derive the address of a particular depth value in the depth buffer, which is tiled & swizzled. Have a look in r200_span.c. If one of the terms of that calculation is incorrect, it could produce the symptoms you're seeing.
Keith
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