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authorZack Rusin <zackr@vmware.com>2013-07-11 12:16:06 -0400
committerZack Rusin <zackr@vmware.com>2013-07-11 20:19:04 -0400
commit00cd455bd50c6b16b2f72a6d2726de3d3818c7f5 (patch)
tree2b13c67bd84020a1bad285c3678b497a571ae1a4 /src/gallium/auxiliary/tgsi
parenta171812d27afb1a52c5d81deaa6027f30bc102e8 (diff)
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gallium: fixup definitions of the rsq and sqrt
GLSL spec says that rsq is undefined for src<=0, but the D3D10 spec says it needs to be a NaN, so lets stop taking an absolute value of the source which completely breaks that behavior. For the gl program we can simply insert an extra abs instrunction which produces the desired behavior there. Signed-off-by: Zack Rusin <zackr@vmware.com> Reviewed-by: Roland Scheidegger <sroland@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com>
Diffstat (limited to 'src/gallium/auxiliary/tgsi')
-rw-r--r--src/gallium/auxiliary/tgsi/tgsi_exec.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index bed0852..1f8e62d 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -339,20 +339,20 @@ micro_rsq(union tgsi_exec_channel *dst,
assert(src->f[2] != 0.0f);
assert(src->f[3] != 0.0f);
#endif
- dst->f[0] = 1.0f / sqrtf(fabsf(src->f[0]));
- dst->f[1] = 1.0f / sqrtf(fabsf(src->f[1]));
- dst->f[2] = 1.0f / sqrtf(fabsf(src->f[2]));
- dst->f[3] = 1.0f / sqrtf(fabsf(src->f[3]));
+ dst->f[0] = 1.0f / sqrtf(src->f[0]);
+ dst->f[1] = 1.0f / sqrtf(src->f[1]);
+ dst->f[2] = 1.0f / sqrtf(src->f[2]);
+ dst->f[3] = 1.0f / sqrtf(src->f[3]);
}
static void
micro_sqrt(union tgsi_exec_channel *dst,
const union tgsi_exec_channel *src)
{
- dst->f[0] = sqrtf(fabsf(src->f[0]));
- dst->f[1] = sqrtf(fabsf(src->f[1]));
- dst->f[2] = sqrtf(fabsf(src->f[2]));
- dst->f[3] = sqrtf(fabsf(src->f[3]));
+ dst->f[0] = sqrtf(src->f[0]);
+ dst->f[1] = sqrtf(src->f[1]);
+ dst->f[2] = sqrtf(src->f[2]);
+ dst->f[3] = sqrtf(src->f[3]);
}
static void