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/*
* light-pp.frag
*
* Lighting per pixel
*
* (c) 2007 Thomas White <taw27@cam.ac.uk>
*
* dtr - Diffraction Tomography Reconstruction
*
*/
varying vec3 col_ambi;
varying vec3 col_diff;
varying vec3 col_spec;
varying vec3 col_emit;
varying float shininess;
varying vec3 normal;
varying vec3 lightvc;
varying vec3 lighthvc;
void main() {
vec3 ambi;
vec3 emit;
vec3 diff;
vec3 spec;
vec3 norm = normalize(normal);
/* Ambient contribution */
ambi = col_ambi * gl_LightModel.ambient.rgb;
/* Emission */
emit = col_emit;
/* Diffuse contribution */
diff = col_diff * gl_LightSource[0].diffuse.rgb * max(dot(normalize(lightvc).xyz, norm), 0.0);
/* Specular contribution */
if ( col_spec.r > 0.0 ) {
float ndothv = max(dot(norm, normalize(lighthvc)), 0.0);
spec = col_spec * gl_LightSource[0].specular.rgb * pow(ndothv, shininess);
}
gl_FragColor = vec4(min(emit.r + ambi.r + diff.r + spec.r, 1.0),
min(emit.g + ambi.g + diff.g + spec.g, 1.0),
min(emit.b + ambi.b + diff.b + spec.b, 1.0),
1.0);
}
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