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void PointLight(in int i,
in vec3 eye,
in vec3 ecPosition3,
in vec3 normal,
inout vec4 ambient,
inout vec4 diffuse,
inout vec4 specular)
{
float nDotVP;
float nDotHV;
float pf;
float att;
float d;
vec3 VP;
vec3 halfvec;
VP = vec3(gl_LightSource[i].position) - ecPosition3;
d = length(VP);
VP = normalize(VP);
att = 1.0 / (gl_LightSource[i].constantAttenuation +
gl_LightSource[i].linearAttenuation * d +
gl_LightSource[i].quadraticAttenuation * d * d);
halfvec = normalize(VP + eye);
nDotVP = max(0.0, dot(normal, VP));
nDotHV = max(0.0, dot(normal, halfvec));
float shininess = gl_FrontMaterial.shininess;
if (nDotVP == 0.0)
pf = 0.0;
else
pf = pow(nDotHV, shininess);
ambient += gl_LightSource[i].ambient * att;
diffuse += gl_LightSource[i].diffuse * nDotVP * att;
specular += gl_LightSource[i].specular * pf * att;
}
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