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varying vec4 diffuse,ambient;
varying vec3 normal,lightDir,halfVector;
void main()
{
vec3 n,halfV;
float NdotL,NdotHV;
/* The ambient term will always be present */
vec4 color = ambient;
/* a fragment shader can't write a varying variable, hence we need
a new variable to store the normalized interpolated normal */
n = normalize(normal);
/* compute the dot product between normal and ldir */
NdotL = max(dot(n,lightDir),0.0);
if (NdotL > 0.0) {
color += diffuse * NdotL;
halfV = normalize(halfVector);
NdotHV = max(dot(n,halfV),0.0);
color += gl_FrontMaterial.specular *
gl_LightSource[0].specular *
pow(NdotHV, gl_FrontMaterial.shininess);
}
float gray = dot(color, vec3(0.299, 0.587, 0.114));
gl_FragColor = vec4(gray, gray, gray, color[3]);;
}
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