Line Shader? (or how the heck do I draw thick line primitives in T3D?)

GFX->getDrawUtil()->drawLine(0,0,1.0,1.0,ColorI(255,255,255));

void GFXDrawUtil::drawLine( F32 x1, F32 y1, F32 x2, F32 y2, const ColorI &color )
{
   drawLine( x1, y1, 0.0f, x2, y2, 0.0f, color );
}

void GFXDrawUtil::drawLine( F32 x1, F32 y1, F32 z1, F32 x2, F32 y2, F32 z2, const ColorI &color )
{
   GFXVertexBufferHandle<GFXVertexPC> verts( mDevice, 2, GFXBufferTypeVolatile );
   verts.lock();

   verts[0].point.set( x1, y1, z1 );
   verts[1].point.set( x2, y2, z2 );

   verts[0].color = color;
   verts[1].color = color;

   verts.unlock();

   mDevice->setVertexBuffer( verts );
   mDevice->setStateBlock( mRectFillSB );
   mDevice->drawPrimitive( GFXLineList, 0, 1 );
}

void AudioTextureObject::drawLine( F32 x1, F32 y1, F32 x2, F32 y2, const ColorI &color )
{
   drawLine( x1, y1, 0.0f, x2, y2, 0.0f, color );
}
void AudioTextureObject::drawLine( F32 x1, F32 y1, F32 z1, F32 x2, F32 y2, F32 z2, const ColorI &color )
{
   GFXVertexBufferHandle<GFXVertexPC> verts( GFX, 2, GFXBufferTypeVolatile );
   verts.lock();

   verts[0].point.set( x1, y1, z1 );
   verts[1].point.set( x2, y2, z2 );

   verts[0].color = color;
   verts[1].color = color;

   verts.unlock();

   GFX->setVertexBuffer( verts );
   GFX->drawPrimitive( GFXLineList, 0, 1 );
}

void AudioTextureObject::drawTriLine( F32 x1, F32 y1, F32 x2, F32 y2, const ColorI &color, F32 thickness )
{
   GFXVertexBufferHandle<GFXVertexPC> verts( GFX, 12, GFXBufferTypeVolatile );

   verts.lock();

   F32 offset = thickness/2.0f;

   F32 xdiff = x2-x1;
   F32 ydiff = y2-y1;   

   Point3F vect(xdiff,ydiff,0.0f);   
   vect = mNormalize(vect); 
   Point2F ovect(offset*vect.x,offset*vect.y);
   
   verts[0].point.set( x1 - ovect.x, y1 - ovect.y, 0.0f );
   verts[1].point.set( x1 - ovect.x, y1 + ovect.y, 0.0f );
   verts[2].point.set( x1 + ovect.x, y1 - ovect.y, 0.0f );   

   verts[3].point.set( x2 + ovect.x, y2 + ovect.y, 0.0f );
   verts[4].point.set( x2 + ovect.x, y2 - ovect.y, 0.0f );
   verts[5].point.set( x2 - ovect.x, y2 + ovect.y, 0.0f );   

   verts[6].point.set( x1 - ovect.x, y1 + ovect.y, 0.0f );
   verts[7].point.set( x2 - ovect.x, y2 + ovect.y, 0.0f );
   verts[8].point.set( x2 + ovect.x, y2 - ovect.y, 0.0f );

   verts[9].point.set( x2 + ovect.x, y2 - ovect.y, 0.0f );
   verts[10].point.set( x1 + ovect.x, y1 - ovect.y, 0.0f );
   verts[11].point.set( x1 - ovect.x, y1 + ovect.y, 0.0f );

   verts[0].color = color;
   verts[1].color = color;
   verts[2].color = color;
   verts[3].color = color;
   verts[4].color = color;
   verts[5].color = color;
   verts[6].color = color;
   verts[7].color = color;
   verts[8].color = color;
   verts[9].color = color;
   verts[10].color = color;
   verts[11].color = color;

   verts.unlock();

   GFX->setVertexBuffer( verts );
   GFX->drawPrimitive( GFXTriangleList, 0, 4 );   
}