iris: Fix fast-clears of swizzled alpha formats
Resources with alpha formats that are mapped to R are fast-cleared with
the wrong clear color.
When such resources with are cleared via iris_clear_texture,
isl_color_value_unpack places channel data in the R channel.
convert_fast_clear_color then overwrites the channel with 0.
To avoid zeroing the clear color, move convert_fast_clear_color to the
other callers of clear_color: iris_clear and iris_clear_render_target.
Enables iris to pass the "A" case of the fcc-clear-tex piglit test.
v2. Rename convert_fast_clear_color to convert_clear_color. (Ken)
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3670
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7345>
1 file changed
