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precision highp float;
varying vec3 v_normal;
uniform vec4 u_diffuse;
uniform vec4 u_specular;
uniform float u_shininess;
void main(void) {
vec3 normal = normalize(v_normal);
vec4 color = vec4(0., 0., 0., 0.);
vec4 diffuse = vec4(0., 0., 0., 1.);
vec4 specular;
diffuse = u_diffuse;
specular = u_specular;
diffuse.xyz *= max(dot(normal,vec3(0.,0.,1.)), 0.);
color.xyz += diffuse.xyz;
color = vec4(color.rgb * diffuse.a, diffuse.a);
gl_FragColor = color;
}
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