Jeu Videz votre presse-papier - Page 582

#ifdef USE_PACKED_VERTEX
HH_FORCEINLINE vec_float4 spu_float_to_half(vec_float4 v)
{
static const hh_u32 RoundingOffset = 1 << (13 - 1);
static const hh_u32 MantissaOffset = 0xC8000000 + RoundingOffset;

vec_uint4 bits = (vec_uint4)v;
vec_uint4 signMask = (vec_uint4){ 0x80000000, 0x80000000, 0x80000000, 0x80000000 };

vec_uint4 vSign = spu_and(bits, signMask);
vec_uint4 vRest = spu_andc(bits, signMask);

vSign = spu_rl(vSign, 16);

vec_uint4 zeroMask = spu_cmpgt(vRest, (vec_uint4){ 0x387FFFFF, 0x387FFFFF, 0x387FFFFF, 0x387FFFFF });
vec_uint4 infiMask = spu_cmpgt(vRest, (vec_uint4){ 0x47FFEFFF, 0x47FFEFFF, 0x47FFEFFF, 0x47FFEFFF });

zeroMask = spu_and(zeroMask, (vec_uint4){ 0x7FFF, 0x7FFF, 0x7FFF, 0x7FFF });

vec_uint4 mantissa = spu_add(vRest, (vec_uint4){ MantissaOffset, MantissaOffset, MantissaOffset, MantissaOffset });

vec_uint4 result = spu_or(infiMask, spu_rl(mantissa, 32-13));
result = spu_and(result, zeroMask); // clamp to zero if we had a denormal
result = spu_or(result, vSign);
//result = spu_shuffle(result, result, (vec_uchar16)(vec_ushort8){ 0x0203, 0x0607, 0x0A0B, 0x0E0F, 0x0203, 0x0607, 0x0A0B, 0x0E0F });
return (vec_float4)result;
}
#endif