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softpipe: Correct repeat-mirror evaluation

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when mirroring the texture corrdinates the indices must be mirrored as
well and the half pixel shift must be applied in reverse.

Fixes a number of tests from:
  dEQP-GLES31.functional.texture.gather.offset.*
  dEQP-GLES31.functional.texture.gather.offsets.*

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Gert Wollny
2019-07-15 13:46:53 +02:00
parent fff624fca4
commit eae4c6df8d
1 changed files with 19 additions and 5 deletions
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src/gallium/drivers/softpipe/sp_tex_sample.c
+19 -5
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@@ -333,20 +333,34 @@ wrap_linear_mirror_repeat(float s, unsigned size, int offset,
{
int flr;
float u;
bool no_mirror;
s += (float)offset / size;
flr = util_ifloor(s);
no_mirror = !(flr & 1);
u = frac(s);
if (flr & 1)
if (no_mirror) {
u = u * size - 0.5F;
} else {
u = 1.0F - u;
u = u * size - 0.5F;
u = u * size + 0.5F;
}
*icoord0 = util_ifloor(u);
*icoord1 = *icoord0 + 1;
*icoord1 = (no_mirror) ? *icoord0 + 1 : *icoord0 - 1;
if (*icoord0 < 0)
*icoord0 = 0;
*icoord0 = 1 + *icoord0;
if (*icoord0 >= (int) size)
*icoord0 = size - 1;
if (*icoord1 >= (int) size)
*icoord1 = size - 1;
*w = frac(u);
if (*icoord1 < 0)
*icoord1 = 1 + *icoord1;
*w = (no_mirror) ? frac(u) : frac(1.0f - u);
}