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