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-rw-r--r--src/gallium/state_trackers/nine/nine_ff.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/gallium/state_trackers/nine/nine_ff.c b/src/gallium/state_trackers/nine/nine_ff.c
index a5466a7bdd4..e79d0b4f881 100644
--- a/src/gallium/state_trackers/nine/nine_ff.c
+++ b/src/gallium/state_trackers/nine/nine_ff.c
@@ -563,7 +563,9 @@ nine_ff_build_vs(struct NineDevice9 *device, struct vs_build_ctx *vs)
struct ureg_src cPsz2 = ureg_DECL_constant(ureg, 27);
ureg_DP3(ureg, tmp_x, ureg_src(r[1]), ureg_src(r[1]));
- ureg_SQRT(ureg, tmp_y, _X(tmp));
+ ureg_RSQ(ureg, tmp_y, _X(tmp));
+ ureg_MUL(ureg, tmp_y, _Y(tmp), _X(tmp));
+ ureg_CMP(ureg, tmp_y, ureg_negate(_Y(tmp)), _Y(tmp), ureg_imm1f(ureg, 0.0f));
ureg_MAD(ureg, tmp_x, _Y(tmp), _YYYY(cPsz2), _XXXX(cPsz2));
ureg_MAD(ureg, tmp_x, _Y(tmp), _X(tmp), _WWWW(cPsz1));
ureg_RCP(ureg, tmp_x, ureg_src(tmp));