919     f32 tr,s;  in C_QUATMtx()  local
930         s = (f32)sqrtf(tr + 1.0f);  in C_QUATMtx()
931         r->w = s * 0.5f;  in C_QUATMtx()
932         s = 0.5f / s;  in C_QUATMtx()
933         r->x = (m[2][1] - m[1][2]) * s;  in C_QUATMtx()
934         r->y = (m[0][2] - m[2][0]) * s;  in C_QUATMtx()
935         r->z = (m[1][0] - m[0][1]) * s;  in C_QUATMtx()
944         s = (f32)sqrtf( (m[i][i] - (m[j][j] + m[k][k])) + 1.0f );  in C_QUATMtx()
945         q[i] = s * 0.5f;  in C_QUATMtx()
947         if (s!=0.0f)  in C_QUATMtx()
948             s = 0.5f / s;  in C_QUATMtx()
950         r->w = (m[k][j] - m[j][k]) * s;  in C_QUATMtx()
951         q[j] = (m[i][j] + m[j][i]) * s;  in C_QUATMtx()
952         q[k] = (m[i][k] + m[k][i]) * s;  in C_QUATMtx()
1127     f32 s,xs,ys,zs,wx,wy,wz,xx,xy,xz,yy,yz,zz;  in C_MTXQuat()  local
1133     s = 2.0f / ( (q->x * q->x) + (q->y * q->y) + (q->z * q->z) + (q->w * q->w) );  in C_MTXQuat()
1135     xs = q->x *  s;     ys = q->y *  s;  zs = q->z *  s;  in C_MTXQuat()