GF_Err Q_DecFloat(GF_BifsDecoder *codec, GF_BitStream *bs, u32 FieldType, SFVec3f BMin, SFVec3f BMax, u32 NbBits, void *field_ptr)
{
switch (FieldType) {
case GF_SG_VRML_SFINT32:
return GF_NON_COMPLIANT_BITSTREAM;
case GF_SG_VRML_SFFLOAT:
*((SFFloat *)field_ptr) = Q_InverseQuantize(BMin.x, BMax.x, NbBits, gf_bs_read_int(bs, NbBits));
return GF_OK;
case GF_SG_VRML_SFVEC2F:
((SFVec2f *)field_ptr)->x = Q_InverseQuantize(BMin.x, BMax.x, NbBits, gf_bs_read_int(bs, NbBits));
((SFVec2f *)field_ptr)->y = Q_InverseQuantize(BMin.y, BMax.y, NbBits, gf_bs_read_int(bs, NbBits));
return GF_OK;
case GF_SG_VRML_SFVEC3F:
((SFVec3f *)field_ptr)->x = Q_InverseQuantize(BMin.x, BMax.x, NbBits, gf_bs_read_int(bs, NbBits));
((SFVec3f *)field_ptr)->y = Q_InverseQuantize(BMin.y, BMax.y, NbBits, gf_bs_read_int(bs, NbBits));
((SFVec3f *)field_ptr)->z = Q_InverseQuantize(BMin.z, BMax.z, NbBits, gf_bs_read_int(bs, NbBits));
return GF_OK;
case GF_SG_VRML_SFCOLOR:
((SFColor *)field_ptr)->red = Q_InverseQuantize(BMin.x, BMax.x, NbBits, gf_bs_read_int(bs, NbBits));
((SFColor *)field_ptr)->green = Q_InverseQuantize(BMin.y, BMax.y, NbBits, gf_bs_read_int(bs, NbBits));
((SFColor *)field_ptr)->blue = Q_InverseQuantize(BMin.z, BMax.z, NbBits, gf_bs_read_int(bs, NbBits));
return GF_OK;
case GF_SG_VRML_SFROTATION:
//forbidden in this Q mode
return GF_NON_COMPLIANT_BITSTREAM;
}
return GF_OK;
}
M4Err Q_DecFloat(BifsDecoder *codec, BitStream *bs, u32 FieldType, SFVec3f BMin, SFVec3f BMax, u32 NbBits, void *field_ptr)
{
switch (FieldType) {
case FT_SFInt32:
return M4InvalidNode;
case FT_SFFloat:
*((SFFloat *)field_ptr) = Q_InverseQuantize(BMin.x, BMax.x, NbBits, BS_ReadInt(bs, NbBits));
return M4OK;
case FT_SFVec2f:
((SFVec2f *)field_ptr)->x = Q_InverseQuantize(BMin.x, BMax.x, NbBits, BS_ReadInt(bs, NbBits));
((SFVec2f *)field_ptr)->y = Q_InverseQuantize(BMin.y, BMax.y, NbBits, BS_ReadInt(bs, NbBits));
return M4OK;
case FT_SFVec3f:
((SFVec3f *)field_ptr)->x = Q_InverseQuantize(BMin.x, BMax.x, NbBits, BS_ReadInt(bs, NbBits));
((SFVec3f *)field_ptr)->y = Q_InverseQuantize(BMin.y, BMax.y, NbBits, BS_ReadInt(bs, NbBits));
((SFVec3f *)field_ptr)->z = Q_InverseQuantize(BMin.z, BMax.z, NbBits, BS_ReadInt(bs, NbBits));
return M4OK;
case FT_SFColor:
((SFColor *)field_ptr)->red = Q_InverseQuantize(BMin.x, BMax.x, NbBits, BS_ReadInt(bs, NbBits));
((SFColor *)field_ptr)->green = Q_InverseQuantize(BMin.y, BMax.y, NbBits, BS_ReadInt(bs, NbBits));
((SFColor *)field_ptr)->blue = Q_InverseQuantize(BMin.z, BMax.z, NbBits, BS_ReadInt(bs, NbBits));
return M4OK;
case FT_SFRotation:
//forbidden in this Q mode
return M4InvalidNode;
}
return M4OK;
}
//SFRotation and SFVec3f are quantized as normalized vectors ,mapped on a cube
//in the UnitSphere (R=1.0)
GF_Err Q_DecCoordOnUnitSphere(GF_BifsDecoder *codec, GF_BitStream *bs, u32 NbBits, u32 NbComp, Fixed *m_ft)
{
u32 i, orient, sign;
s32 value;
Fixed tang[4], delta;
s32 dir;
if (NbComp != 2 && NbComp != 3) return GF_BAD_PARAM;
//only 2 or 3 comp in the quantized version
dir = 1;
if(NbComp == 2) dir -= 2 * gf_bs_read_int(bs, 1);
orient = gf_bs_read_int(bs, 2);
for(i=0; i<NbComp; i++) {
value = gf_bs_read_int(bs, NbBits) - (1 << (NbBits-1) );
sign = (value >= 0) ? 1 : -1;
m_ft[i] = sign * Q_InverseQuantize(0, 1, NbBits-1, sign*value);
}
delta = 1;
for (i=0; i<NbComp; i++) {
tang[i] = gf_tan(gf_mulfix(GF_PI/4, m_ft[i]) );
delta += gf_mulfix(tang[i], tang[i]);
}
delta = gf_divfix(INT2FIX(dir), gf_sqrt(delta) );
m_ft[orient] = delta;
for (i=0; i<NbComp; i++) {
m_ft[ (orient + i+1) % (NbComp+1) ] = gf_mulfix(tang[i], delta);
}
return GF_OK;
}
//SFRotation and SFVec3f are quantized as normalized vectors ,mapped on a cube
//in the UnitSphere (R=1.0)
M4Err Q_DecCoordOnUnitSphere(BifsDecoder *codec, BitStream *bs, u32 NbBits, u32 NbComp, SFFloat *m_ft)
{
u32 i, orient, value, sign;
SFFloat tang[4];
SFFloat dir, delta;
if (NbComp != 2 && NbComp != 3) return M4BadParam;
//only 2 or 3 comp in the quantized version
dir = 1;
if(NbComp == 2)
dir -= (SFFloat) (2 * BS_ReadInt(bs, 1) );
//the main orientation of the vector is coded IN the bitstream (eg
//the prnincipal component of the vector 0, 1, 2)
orient = BS_ReadInt(bs, 2);
//extract composantes
for(i=0; i<NbComp; i++) {
value = BS_ReadInt(bs, NbBits) - (1 << (NbBits-1) );
sign = (value >=0 ) ? 1 : -1;
m_ft[i] = sign * Q_InverseQuantize(0, 1, NbBits-1, sign*value);
}
//extract angle
delta = 1;
for (i=0; i<NbComp; i++) {
tang[i] = (SFFloat) tan( QP_PI * m_ft[i] / 4);
delta += tang[i] * tang[i];
}
delta = (SFFloat) ( dir / sqrt(delta) );
m_ft[orient] = delta;
for (i=0;i<NbComp;i++) {
m_ft[ (orient + i+1) % (NbComp+1) ] = tang[i] * delta;
}
return M4OK;
}
