#include "twist.h"
#include "globals.h"
#include "intrin.h"

void Twist::AddToScene( float fTime, int iObject, bool isLowPoly  )
{
	g_Objects[ iObject ].Lock();
	for( int i= 0; i < 3; ++i )
	{
		AddCylinder( fTime, iObject, 
			fTime * 2.5f + (float)i * c_2PI / 3.0f, 
			2.0f, 
			1.66f,
			isLowPoly);
	}
	g_Objects[ iObject ].Unlock();
}

void Twist::AddCylinder( float fTime, int iObject, float fBaseAngle, float fBaseSize, float fSize, bool isLowPoly  )
{
	DWORD dwColor= 0x80404040;

	const int iSliceCount= 64;
	const int iSideCount= isLowPoly ? 3 : 24;
	float fOffset= 0.0f;

	int iBaseIndex= g_Objects[ iObject ].GetVertCount();

	for( int iSlices= -iSliceCount; iSlices < iSliceCount; ++iSlices )
	{
		float fLocalTime= fTime + iSlices / 32.0f;
		float fAddAngle= 6.0f * sin( fLocalTime * 0.78f + 0.8f * sin( fLocalTime  * 0.37f) );
		D3DXVECTOR3 vMid( 
			fBaseSize * sin( fBaseAngle + fAddAngle ), 
			(float)iSlices * 0.25f, 
			fBaseSize * cos( fBaseAngle + fAddAngle ) );

		for( int i= 0; i < iSideCount; ++i )
		{
			if( iSlices != -iSliceCount )
			{
				int ID1= g_Objects[ iObject ].GetVertCount();
				int ID2= ID1 - 1 + ( i == 0 ? iSideCount : 0 );
				int ID3= ID1 - iSideCount;
				int ID4= ID2 - iSideCount;

				g_Objects[ iObject ].AddIndex( ID1 );
				g_Objects[ iObject ].AddIndex( ID2 );
				g_Objects[ iObject ].AddIndex( ID3 );

				g_Objects[ iObject ].AddIndex( ID3 );
				g_Objects[ iObject ].AddIndex( ID2 );
				g_Objects[ iObject ].AddIndex( ID4 );
			}

			float fAngle= fOffset + c_2PI * (float)i / (float)iSideCount;

			D3DXVECTOR3 vNormal( cos( fAngle ), 0.0f, -sin( fAngle ) );
			
			Renderjob::SVertex V;
			*((D3DXVECTOR3*)&(V.x))= vMid + vNormal * fSize;
			*((D3DXVECTOR3*)&(V.nx))= vNormal;
			V.dwColor= dwColor;
			V.tu= 0.0f;
			V.tv= 0.0f;

			g_Objects[ iObject ].AddVertex( V );

		}
		//fOffset+= c_PI / (float)iSideCount;

	}
}