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gallivm: fix rgtc2 format

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In some cases, there can be garbage in the upper bits after the channel
decode - for dxt5 this didn't matter (as the upper bits are shifted out
anyway) but for rgtc2 formats it does.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4416>
This commit is contained in:
Roland Scheidegger 2020-04-02 02:51:03 +02:00 • committed by Marge Bot
parent 5cc27d59a1
commit ebb5b88a02
1 changed files with 2 additions and 0 deletions
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src/gallium/auxiliary/gallivm/lp_bld_format_s3tc.c
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@ -1023,6 +1023,8 @@ s3tc_dxt5_alpha_channel(struct gallivm_state *gallivm,
alpha = LLVMBuildAnd(builder, alpha, LLVMBuildNot(builder, mask6, ""), "");
alpha = LLVMBuildOr(builder, alpha, mask7, "");
}
/* There can be garbage in upper bits, mask them off for rgtc formats */
alpha = LLVMBuildAnd(builder, alpha, lp_build_const_int_vec(gallivm, type, 0xff), "");
return alpha;
}