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engines/hpl1/engine/impl/shaders/hpl1_refract_water.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 FRAGMENT PROGRAM /////////////////
+///////////////////////////////////////////////////////
+
+in vec2 vUv; //in object space
+in vec3 vNormal;
+in vec3 vEyePos;
+in vec4 vColor;
+
+OUTPUT
+
+uniform sampler2DRect tex0; //screenMap
+uniform sampler2D tex1; //refractMap
+uniform sampler2D tex2; //diffuseMap
+
+uniform vec2 screenSize;
+uniform float scale;
+uniform float t;
+
+void main()
+{
+	//t *= 1;
+	vec2 uv_offset1 = vUv;
+	uv_offset1.x += sin(t*0.8 + vUv.y*10.0)*0.04;
+	uv_offset1.y += sin(t*0.8 + uv_offset1.x*10.0)*0.04;
+
+	vec3 offset1 = ((texture(tex1, uv_offset1)*2.0) - vec4(1.0)).xyz;
+
+	vec2 uv_offset2 = vUv;
+	uv_offset2.x += sin(t*-2.6 + vUv.y*12.0)*0.03;
+	uv_offset2.y += sin(t*-2.6 + uv_offset2.x*12.0)*0.03;
+
+	vec3 offset2 = ((texture(tex1, uv_offset2)*2.0) - vec4(1.0)).xyz;
+	offset2.xy = -offset2.xy;
+
+	vec3 offset = normalize(offset1*0.7 + offset2*0.3);
+
+	//float fresnel = saturate(dot(normalize(vEyePos), normalize(vNormal)));
+	//fresnel = (fresnel + 0.2)*0.8;
+
+	vec3 waterColor = texture(tex2, uv_offset1).xyz;
+
+	vec4 screenColor = texture2DRect(tex0, gl_FragCoord.xy + offset.xy * -scale);
+	if(screenColor.w < 0.5) screenColor = texture2DRect(tex0, gl_FragCoord.xy);
+
+	outColor.xyz = screenColor.xyz * waterColor;
+
+	//outColor.y = uv.y+1 + uv_offset1.y;
+	outColor.xyz *= clamp(dot(vec3(1.0/3.0, 1.0/3.0, 1.0/3.0), offset), 0.0, 1.0)*0.5 + 0.5;
+	outColor.xyz += pow(clamp(dot(vec3(1.0/3.0, 1.0/3.0, 1.0/3.0), offset), 0.0, 1.0), 8.0)*5.0;
+}