59 lines
1.4 KiB
Plaintext
59 lines
1.4 KiB
Plaintext
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uniform int nr_lights;
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varying vec3 q_tilde;
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varying vec3 inv_T_square_v;
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varying vec3 inv_T_square_e_c;
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varying vec4 ev_clip;
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varying vec3 v;
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varying vec4 a;
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varying vec4 s;
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void main()
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{
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float q_tilde_squared_length = dot(q_tilde.xy,q_tilde.xy);
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if (q_tilde_squared_length > 1.0)
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discard;
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float lambda = 1.0/(1.0+q_tilde.z*sqrt(1.0-q_tilde_squared_length));
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vec3 n = inv_T_square_e_c + lambda * inv_T_square_v;
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gl_FragColor = a;
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vec3 l;
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vec4 specular;
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vec4 diffuse;
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vec4 result_color = vec4(0);
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for (int i=0; i<nr_lights; ++i) {
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if (i==0) {
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l=normalize(gl_LightSource[0].position.xyz);
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specular=gl_LightSource[0].specular;
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diffuse=gl_LightSource[0].diffuse;
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}
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if (i==1) {
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l=normalize(gl_LightSource[1].position.xyz);
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specular=gl_LightSource[1].specular;
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diffuse=gl_LightSource[1].diffuse;
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}
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if (i==2) {
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l=normalize(gl_LightSource[2].position.xyz);
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specular=gl_LightSource[2].specular;
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diffuse=gl_LightSource[2].diffuse;
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}
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if (i==3) {
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l=normalize(gl_LightSource[3].position.xyz);
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specular=gl_LightSource[3].specular;
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diffuse=gl_LightSource[3].diffuse;
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}
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vec3 h=normalize(v+l);
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float ldotn = dot(n,l);
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if (ldotn > 0.0) {
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result_color +=
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ldotn*diffuse*gl_Color+
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pow(max(dot(n,h), 0.0), gl_FrontMaterial.shininess)*s*specular;
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}
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}
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gl_FragColor = result_color;
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}
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