port from perforce

evoke-64k/trunk/ev10/twist.cpp

@@ -0,0 +1,73 @@
+#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;
+
+	}
+}