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st/nine: Remove usage of SQRT in ff code 

SQRT is not supported everywhere, so replace
it by RSQ + MUL and handle case <= 0.

Signed-off-by: Axel Davy <axel.davy@ens.fr>
This commit is contained in:
Axel Davy 2016-02-06 19:55:54 +01:00
parent 17078d92ea
commit 6b43f5b1d4
1 changed files with 3 additions and 1 deletions
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4
src/gallium/state_trackers/nine/nine_ff.c
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@ -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));