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gallium/u_blitter: don't use TXF for scaled blits

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There seems to be a rounding difference with F2I vs nearest filtering.
The precise problem in the rounding is unknown.

This fixes an incorrect output with OpenMAX encoding.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2017-07-12 21:21:38 +02:00
parent 59adde0eab
commit f9d5611617
1 changed files with 6 additions and 4 deletions
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10
src/gallium/auxiliary/util/u_blitter.c
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@ -1777,15 +1777,17 @@ void util_blitter_blit_generic(struct blitter_context *blitter,
return;
}
if (blit_stencil ||
(dstbox->width == abs(srcbox->width) &&
dstbox->height == abs(srcbox->height))) {
bool is_scaled = dstbox->width != abs(srcbox->width) ||
dstbox->height != abs(srcbox->height);
if (blit_stencil || !is_scaled)
filter = PIPE_TEX_FILTER_NEAREST;
}
bool use_txf = false;
/* Don't support scaled blits. The TXF shader uses F2I for rounding. */
if (ctx->has_txf &&
!is_scaled &&
filter == PIPE_TEX_FILTER_NEAREST &&
src->target != PIPE_TEXTURE_CUBE &&
src->target != PIPE_TEXTURE_CUBE_ARRAY) {