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gallium: PPC: clamp y to [-128,128] for LIT

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This commit is contained in:
Brian Paul 2008-10-22 17:29:37 -06:00
parent f8ab4feb75
commit 0ac9945781
1 changed files with 5 additions and 4 deletions
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9
src/gallium/auxiliary/tgsi/tgsi_ppc.c
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@ -636,16 +636,17 @@ emit_lit(struct gen_context *gen, struct tgsi_full_instruction *inst)
FETCH(gen, *inst, w_vec, 0, CHAN_W); /* w_vec = src[0].w */
/* XXX clamp Y to [-128, 128] */
/* clamp Y to [-128, 128] */
load_constant_vec(gen, p128_vec, 128.0f);
load_constant_vec(gen, n128_vec, -128.0f);
ppc_vmaxfp(gen->f, y_vec, y_vec, n128_vec); /* y = max(y, -128) */
ppc_vminfp(gen->f, y_vec, y_vec, p128_vec); /* y = min(y, 128) */
/* if temp.x > 0
* pow(tmp.y, tmp.w)
* z = pow(tmp.y, tmp.w)
* else
* 0.0
* z = 0.0
*/
ppc_vec_pow(gen->f, pow_vec, y_vec, w_vec); /* pow = pow(y, w) */
ppc_vcmpgtfpx(gen->f, pos_vec, x_vec, zero_vec); /* pos = x > 0 */
ppc_vand(gen->f, z_vec, pow_vec, pos_vec); /* z = pow & pos */