vrend: always set CLAMP_READ_COLOR to false in do_readpixels

Some paths don't emit rasterizer state or framebuffer state before calling
do_readpixels, and because of that the clamping is not done properly.

Fixes 0d8477543578bc5c561e5972fce1bcce596db9b4
Fixes several piglit snorm tests.

Signed-off-by: Italo Nicola <italonicola@collabora.com>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
1 file changed