From 29f4931b520f71b27d65a5df70503d6dfc622aed Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Mon, 20 Jul 2020 15:41:27 +1000 Subject: [PATCH] llvmpipe: fix 4-bit output scaling. This is overkill, but hey 4-bits per channel is hardly something to care about. (Suggestions welcome for a better version). Fixes: dEQP-GLES2.functional.fbo.render.*rgba4* Reviewed-by: Adam Jackson Reviewed-by: Mike Blumenkrantz Part-of: --- src/gallium/drivers/llvmpipe/lp_state_fs.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c index c77f0f38df8..80dd95f01e9 100644 --- a/src/gallium/drivers/llvmpipe/lp_state_fs.c +++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c @@ -1712,6 +1712,15 @@ scale_bits(struct gallivm_state *gallivm, int delta_bits = src_bits - dst_bits; if (delta_bits <= dst_bits) { + + if (dst_bits == 4) { + struct lp_type flt_type = lp_type_float_vec(32, src_type.length * 32); + + result = lp_build_unsigned_norm_to_float(gallivm, src_bits, flt_type, src); + result = lp_build_clamped_float_to_unsigned_norm(gallivm, flt_type, dst_bits, result); + return result; + } + /* * Approximate the rescaling with a single shift. *