69fbd5cb90
The algorithm used to rendering smooth lines worked under the assumption
that line coords were in the [0, 1] range. This was correct when using
an orthogonal projection, but not when using a perspective projection.
With a perspective projection (where the value for 1/Wc set in the VPM
is not 1.0), line coords values are also affected by this projection, so
the values are not in this range.
To deal with this, we normalize the line coords using the Wc value so
the range becomes [0, 1], and the smooth line rendering works as
expected.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10496
Fixes: ee4d51f8b2 ("v3d: Add a lowering pass for line smoothing")
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28072>
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