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Basic implementation of the ColorOffsetFilter described in the Starling manual.
// =================================================================================================
//
// Starling Framework
// Copyright Gamua. All Rights Reserved.
//
// This program is free software. You can redistribute and/or modify it
// in accordance with the terms of the accompanying license agreement.
//
// =================================================================================================
package starling.extensions
{
import starling.filters.FragmentFilter;
import starling.rendering.FilterEffect;
public class ColorOffsetFilter extends FragmentFilter
{
public function ColorOffsetFilter(redOffset:Number=0, greenOffset:Number=0,
blueOffset:Number=0, alphaOffset:Number=0):void
{
colorOffsetEffect.redOffset = redOffset;
colorOffsetEffect.greenOffset = greenOffset;
colorOffsetEffect.blueOffset = blueOffset;
colorOffsetEffect.alphaOffset = alphaOffset;
}
override protected function createEffect():FilterEffect
{
return new ColorOffsetEffect();
}
private function get colorOffsetEffect():ColorOffsetEffect
{
return effect as ColorOffsetEffect;
}
public function get redOffset():Number { return colorOffsetEffect.redOffset; }
public function set redOffset(value:Number):void { colorOffsetEffect.redOffset = value; }
public function get greenOffset():Number { return colorOffsetEffect.greenOffset; }
public function set greenOffset(value:Number):void { colorOffsetEffect.greenOffset = value; }
public function get blueOffset():Number { return colorOffsetEffect.blueOffset; }
public function set blueOffset(value:Number):void { colorOffsetEffect.blueOffset = value; }
public function get alphaOffset():Number { return colorOffsetEffect.alphaOffset; }
public function set alphaOffset(value:Number):void { colorOffsetEffect.alphaOffset = value; }
}
}
import flash.display3D.Context3D;
import flash.display3D.Context3DProgramType;
import starling.rendering.FilterEffect;
import starling.rendering.Program;
import starling.utils.RenderUtil;
class ColorOffsetEffect extends FilterEffect
{
private var _offsets:Vector.<Number>;
public function ColorOffsetEffect()
{
_offsets = new Vector.<Number>(4, true);
}
override protected function createProgram():Program
{
var vertexShader:String = STD_VERTEX_SHADER;
var fragmentShader:String = [
tex("ft0", "v0", 0, texture),
"add oc, ft0, fc0"
].join("\n");
return Program.fromSource(vertexShader, fragmentShader);
}
override protected function beforeDraw(context:Context3D):void
{
context.setProgramConstantsFromVector(Context3DProgramType.FRAGMENT, 0, _offsets);
super.beforeDraw(context);
}
public function get redOffset():Number { return _offsets[0]; }
public function set redOffset(value:Number):void { _offsets[0] = value; }
public function get greenOffset():Number { return _offsets[1]; }
public function set greenOffset(value:Number):void { _offsets[1] = value; }
public function get blueOffset():Number { return _offsets[2]; }
public function set blueOffset(value:Number):void { _offsets[2] = value; }
public function get alphaOffset():Number { return _offsets[3]; }
public function set alphaOffset(value:Number):void { _offsets[3] = value; }
}
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