mesa: Fix _mesa_float_to_unorm() on 32-bit systems.
This fixes the following CTS test on 32-bit systems:
GTF-GL46.gtf30.GL3Tests.packed_depth_stencil.packed_depth_stencil_init
It does glGetTexImage of a 16-bit SNORM image, requesting 32-bit UNORM
data. In get_tex_rgba_uncompressed, we round trip through float to
handle image transfer ops for clamping. _mesa_format_convert does:
_mesa_float_to_unorm(0.
571428597f, 32)
which translated to:
_mesa_lroundevenf(0.
571428597f * 0xffffffffu)
which produced different results on 64-bit and 32-bit systems:
64-bit: result = 0x92492500
32-bit: result = 0x80000000
This is because the size of "long" varies between the two systems, and
0x92492500 is too large to fit in a signed 32-bit integer. To fix this,
we switch to the new _mesa_i64roundevenf function which always does the
64-bit operation.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104395
Fixes:
594fc0f8595 ("mesa: Replace F_TO_I() with _mesa_lroundevenf().")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>