49 lines
965 B
GLSL
49 lines
965 B
GLSL
/**
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* @file lightFuncSpecularV.glsl
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*
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* Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
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* $License$
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*/
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float calcDirectionalLight(vec3 n, vec3 l)
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{
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float a = max(dot(n,l),0.0);
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return a;
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}
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float calcDirectionalSpecular(vec3 view, vec3 n, vec3 l)
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{
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return pow(max(dot(reflect(view, n),l), 0.0),8.0);
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}
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float calcDirectionalLightSpecular(inout vec4 specular, vec3 view, vec3 n, vec3 l, vec3 lightCol, float da)
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{
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specular.rgb += calcDirectionalSpecular(view,n,l)*lightCol*da;
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return max(dot(n,l),0.0);
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}
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vec3 calcPointLightSpecular(inout vec4 specular, vec3 view, vec3 v, vec3 n, vec3 l, float r, float pw, vec3 lightCol)
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{
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//get light vector
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vec3 lv = l-v;
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//get distance
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float d = length(lv);
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//normalize light vector
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lv *= 1.0/d;
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//distance attenuation
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float da = clamp(1.0/(r * d), 0.0, 1.0);
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//angular attenuation
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da *= calcDirectionalLightSpecular(specular, view, n, lv, lightCol, da);
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return da*lightCol;
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}
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