Initial commit

Torque/SDK/engine/dgl/splineUtil.cc

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+//-----------------------------------------------------------------------------
+// Torque Game Engine
+// Copyright (C) GarageGames.com, Inc.
+//-----------------------------------------------------------------------------
+
+#include "dgl/splineUtil.h"
+#include "platform/platformGL.h"
+
+namespace SplineUtil{
+
+
+//------------------------------------------------------------------------------
+// Draws strip of specified width along spline.  Polys on strip segments are
+//    front-facing (billboarded)
+//------------------------------------------------------------------------------
+void drawSplineBeam( const Point3F& camPos, U32 numSegments,
+                     F32 width, SplinePatch &spline, F32 uvOffset, F32 numTexRep )
+{
+
+   Point3F beginPoint, endPoint;
+   spline.calc( 0.0, beginPoint );
+   spline.calc( 1.0, endPoint );
+
+   F32 approxBeamLength = (beginPoint - endPoint).len();
+   F32 texRepFactor = approxBeamLength * numTexRep;
+
+
+   glBegin(GL_TRIANGLE_STRIP);
+
+
+   for( int i=0; i<numSegments; i++ )
+   {
+      F32 t = ((F32)i) / ((F32)(numSegments - 1));
+
+      Point3F curPoint;
+      spline.calc( t, curPoint );
+
+      Point3F segmentDir;
+
+      // handle last segment case
+      Point3F nextPoint;
+      if( i == (numSegments - 1) )
+      {
+         F32 modT = ((F32)(numSegments - 1)) / ((F32)numSegments);
+         spline.calc( modT, nextPoint );
+         segmentDir = curPoint - nextPoint;
+      }
+      else
+      {
+         F32 modT = t + (1.0 / numSegments);
+         spline.calc( modT, nextPoint );
+         segmentDir = nextPoint - curPoint;
+      }
+
+      if( segmentDir.isZero() ) continue;
+      segmentDir.normalize();
+
+
+      Point3F dirFromCam = curPoint - camPos;
+      Point3F crossVec;
+      mCross(dirFromCam, segmentDir, &crossVec);
+      crossVec.normalize();
+
+      crossVec *= width * 0.5;
+
+      F32 u = uvOffset + texRepFactor * t;
+
+      glTexCoord2f( u, 0.0 );
+      glVertex3fv( curPoint + crossVec );
+
+      glTexCoord2f( u, 1.0 );
+      glVertex3fv( curPoint - crossVec );
+
+   }
+
+   glEnd();
+
+
+}
+
+//------------------------------------------------------------------------------
+// Draws strip of specified width along spline.  Polys on strip segments are
+//    front-facing (billboarded)
+//------------------------------------------------------------------------------
+void drawSplineBeam( SplineBeamInfo &sbi )
+{
+   if( !sbi.camPos || !sbi.spline ) return;
+
+   Point3F beginPoint, endPoint;
+   sbi.spline->calc( 0.0, beginPoint );
+   sbi.spline->calc( 1.0, endPoint );
+
+   F32 approxBeamLength = (beginPoint - endPoint).len();
+   F32 texRepFactor = approxBeamLength * sbi.numTexRep;
+
+
+   glBegin(GL_TRIANGLE_STRIP);
+
+
+   for( int i=0; i<sbi.numSegments; i++ )
+   {
+      F32 t = ((F32)i) / ((F32)(sbi.numSegments - 1));
+
+      Point3F curPoint;
+      sbi.spline->calc( t, curPoint );
+
+      Point3F segmentDir;
+
+      // handle last segment case
+      Point3F nextPoint;
+      if( i == (sbi.numSegments - 1) )
+      {
+         F32 modT = ((F32)(sbi.numSegments - 1)) / ((F32)sbi.numSegments);
+         sbi.spline->calc( modT, nextPoint );
+         segmentDir = curPoint - nextPoint;
+      }
+      else
+      {
+         F32 modT = t + (1.0 / sbi.numSegments);
+         sbi.spline->calc( modT, nextPoint );
+         segmentDir = nextPoint - curPoint;
+      }
+
+      if( segmentDir.isZero() ) continue;
+      segmentDir.normalize();
+
+
+      Point3F dirFromCam = curPoint - *sbi.camPos;
+      Point3F crossVec;
+      mCross(dirFromCam, segmentDir, &crossVec);
+      crossVec.normalize();
+
+      crossVec *= sbi.width * 0.5;
+
+      F32 u = sbi.uvOffset + texRepFactor * t;
+
+      if( i== 0 && sbi.zeroAlphaStart )
+      {
+         glColor4f( sbi.color.red, sbi.color.green, sbi.color.blue, 0.0 );
+      }
+      else
+      {
+         glColor4fv( sbi.color );
+      }
+
+      glTexCoord2f( u, 0.0 );
+      glVertex3fv( curPoint + crossVec );
+
+      glTexCoord2f( u, 1.0 );
+      glVertex3fv( curPoint - crossVec );
+
+   }
+
+   glEnd();
+
+}
+
+
+
+
+
+} // end SplineUtil namespace