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nvc0: change logic for centering of eng2d blit when downsampling

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We want to center the sample. The old code may have been correct given
the limited values of ms_x/y, but the new logic should be more
intuitive. Note that ms_x can only be 1/2 and ms_y can only be 0/1.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Ilia Mirkin 2014-04-18 00:08:16 -04:00
parent 6d5c3c8260
commit 47c19a5819
1 changed files with 2 additions and 2 deletions
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4
src/gallium/drivers/nouveau/nvc0/nvc0_surface.c
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@ -1066,8 +1066,8 @@ nvc0_blit_eng2d(struct nvc0_context *nvc0, const struct pipe_blit_info *info)
if (src->base.base.nr_samples > dst->base.base.nr_samples) {
/* center src coorinates for proper MS resolve filtering */
srcx += (int64_t)(src->ms_x + 0) << 32;
srcy += (int64_t)(src->ms_y + 1) << 31;
srcx += (int64_t)1 << (src->ms_x + 31);
srcy += (int64_t)1 << (src->ms_y + 31);
}
dstx = info->dst.box.x << dst->ms_x;