SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/irrlicht/COGLES2ParallaxMap.fsh

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+// Copyright (C) 2009-2010 Amundis
+// Heavily based on the OpenGL driver implemented by Nikolaus Gebhardt
+// and OpenGL ES driver implemented by Christian Stehno
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in Irrlicht.h
+#define MAX_LIGHTS 2
+
+precision mediump float;
+
+uniform sampler2D texture0;
+uniform sampler2D texture1;
+
+//uniform vec4 uLightDiffuse[MAX_LIGHTS];
+uniform float uHeightScale;
+
+varying vec4 varTexCoord;
+varying vec3 varLightVector[MAX_LIGHTS];
+varying vec4 varLightColor[MAX_LIGHTS];
+varying vec3 varEyeVector;
+
+varying vec4 debug;
+
+void main(void)
+{
+	// fetch color and normal map
+	vec4 normalMap = texture2D(texture1, varTexCoord.xy) *  2.0 - 1.0;
+
+	// height = height * scale
+	normalMap *= uHeightScale;
+	
+	// calculate new texture coord: height * eye + oldTexCoord
+	vec2 offset = varEyeVector.xy * normalMap.w + varTexCoord.xy;
+
+	// fetch new textures
+	vec4 colorMap  = texture2D(texture0, offset);
+	normalMap = normalize(texture2D(texture1, offset) * 2.0 - 1.0); 
+	
+	// calculate color of light 0
+	vec4 color = clamp(varLightColor[0], 0.0, 1.0) * dot(normalMap.xyz, normalize(varLightVector[0].xyz));
+	
+	// calculate color of light 1
+	color += clamp(varLightColor[1], 0.0, 1.0) * dot(normalMap.xyz, normalize(varLightVector[1].xyz));
+
+	//luminance * base color
+	color *= colorMap;
+	color.a = varLightColor[0].a;
+	
+	gl_FragColor = color;
+}