// Copyright 2006-2010 (C) - Frictional Games
//
// This file is part of HPL1 Engine
//
// For conditions of distribution and use, see copyright notice in LICENSE-shaders
//

///////////////////////////////////////////////////////
/// REFRACTION FRAGMENT PROGRAM /////////////////
///////////////////////////////////////////////////////

in vec2 vUv; //in object space
in vec4 vColor;

OUTPUT

uniform sampler2DRect tex0; //screenMap
uniform sampler2D tex1; //refractMap

uniform vec2 screenSize;
uniform float scale;

void main()
{
	vec3 offset = vec3(((texture(tex1, vUv)*2.0) - vec4(1.0)) * vColor.w);

	outColor = texture2DRect(tex0, gl_FragCoord.xy - (offset.xy*scale) / gl_FragCoord.z);
}