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engines/hpl1/engine/impl/shaders/hpl1_refract_special.fragment

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+// 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 SPECIAL FRAGMENT PROGRAM /////////////////
+///////////////////////////////////////////////////////
+
+in vec2 vUv; //in object space
+in vec4 vColor;
+
+OUTPUT
+
+uniform sampler2DRect tex0; //screenMap
+uniform sampler2D tex1; //refractMap
+uniform sampler2D tex2; //alphaMap
+
+uniform vec2 screenSize;
+uniform float t;
+uniform float scale;
+
+void main()
+{
+	float alpha = texture(tex2, vUv).x;
+	vec2 uv2 = (gl_FragCoord.xy / screenSize);
+	uv2.x += sin(t + uv2.y*10) * 0.001 * scale;
+	uv2.y += sin(t + uv2.x*10) * 0.001 * scale;
+	vec3 offset = vec3(((texture(tex1, uv2)*2.0) - vec4(1.0)) * alpha * vColor.w);
+
+	outColor.xyz = (texture2DRect(tex0,gl_FragCoord.xy - offset.xy*scale)).xyz;
+}