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gallivm: Fix mipfiltering with negative lod bias.

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In particular, don't use the clamped lod to compute level + 1, or
lod in [-1, 0] range will actually interpolate with level 1.

This makes Mipfilter DCT pass 100%.
This commit is contained in:
José Fonseca 2010-05-08 23:16:38 +01:00
parent ff7542ab90
commit 08b3179f48
1 changed files with 4 additions and 2 deletions
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6
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -1046,8 +1046,10 @@ lp_build_linear_mip_levels(struct lp_build_sample_context *bld,
int_bld->zero,
last_level);
/* compute level 1 and clamp to legal range of levels */
*level1_out = lp_build_add(int_bld, *level0_out, int_bld->one);
*level1_out = lp_build_min(int_bld, *level1_out, last_level);
level = lp_build_add(int_bld, level, int_bld->one);
*level1_out = lp_build_clamp(int_bld, level,
int_bld->zero,
last_level);
*weight_out = lp_build_fract(float_bld, lod);
}