/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/


#include "hsTypes.h"
#include "hsGeometry3.h"
#include "hsSfxIntenseAlpha.h"
#include "../plGeometry/hsTriangle3.h"


hsSfxIntenseAlpha::hsSfxIntenseAlpha()
: fMinAlpha(0)
{
	fFlags |= kInclusive;
}

hsSfxIntenseAlpha::~hsSfxIntenseAlpha()
{
}

void hsSfxIntenseAlpha::ProcessPreInterpShadeVerts(hsExpander<hsGShadeVertex*>& vList)
{
	hsScalar oScale = 1.f - fMinAlpha;
	for( vList.First(); vList.More(); vList.Plus() )
	{
		hsGShadeVertex* s = vList.Current();
		hsScalar o = hsMaximum(hsMaximum(s->fShade.r, s->fShade.g), s->fShade.b);
		o *= oScale;
		o += fMinAlpha;
		s->fShade.a *= o;
	}
}

void hsSfxIntenseAlpha::Read(hsStream* s)
{
	fMinAlpha = s->ReadSwapScalar();
}

void hsSfxIntenseAlpha::Write(hsStream* s)
{
	s->WriteSwapScalar(fMinAlpha);
}