/*!***************************************************************************
@Function Name PVRTMatrixRotationZF
@Output mOut Rotation matrix
@Input fAngle Angle of the rotation
@Description Create an Z rotation matrix mOut.
*****************************************************************************/
void PVRTMatrixRotationZF(
PVRTMATRIXf &mOut,
const float fAngle)
{
float fCosine, fSine;
/* Precompute cos and sin */
#if defined(BUILD_DX9) || defined(BUILD_D3DM) || defined(BUILD_DX10)
fCosine = (float)PVRTFCOS(-fAngle);
fSine = (float)PVRTFSIN(-fAngle);
#else
fCosine = (float)PVRTFCOS(fAngle);
fSine = (float)PVRTFSIN(fAngle);
#endif
/* Create the trigonometric matrix corresponding to Z Rotation */
mOut.f[ 0]=fCosine; mOut.f[ 4]=fSine; mOut.f[ 8]=0.0f; mOut.f[12]=0.0f;
mOut.f[ 1]=-fSine; mOut.f[ 5]=fCosine; mOut.f[ 9]=0.0f; mOut.f[13]=0.0f;
mOut.f[ 2]=0.0f; mOut.f[ 6]=0.0f; mOut.f[10]=1.0f; mOut.f[14]=0.0f;
mOut.f[ 3]=0.0f; mOut.f[ 7]=0.0f; mOut.f[11]=0.0f; mOut.f[15]=1.0f;
}
/*!***************************************************************************
@Function PVRTMatrixQuaternionRotationAxisF
@Output qOut Rotation quaternion
@Input vAxis Axis to rotate around
@Input fAngle Angle to rotate
@Description Create quaternion corresponding to a rotation of fAngle
radians around submitted vector.
*****************************************************************************/
void PVRTMatrixQuaternionRotationAxisF(
PVRTQUATERNIONf &qOut,
const PVRTVECTOR3f &vAxis,
const float fAngle)
{
float fSin, fCos;
fSin = (float)PVRTFSIN(fAngle * 0.5f);
fCos = (float)PVRTFCOS(fAngle * 0.5f);
/* Create quaternion */
qOut.x = vAxis.x * fSin;
qOut.y = vAxis.y * fSin;
qOut.z = vAxis.z * fSin;
qOut.w = fCos;
/* Normalise it */
PVRTMatrixQuaternionNormalizeF(qOut);
}
