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//
// Bui Tuong Phong shading model (per-pixel)
//
// by
// Massimiliano Corsini
// Visual Computing Lab (2006)
//
varying vec3 normal;
varying vec3 vpos;
uniform float shininess;
void main()
{
vec3 n = normalize(normal);
vec4 diffuse = vec4(0.0);
vec4 specular = vec4(0.0);
// the material properties are embedded in the shader (for now)
vec4 mat_ambient = vec4(1.0, 1.0, 1.0, 1.0);
vec4 mat_diffuse = vec4(1.0, 1.0, 1.0, 1.0);
vec4 mat_specular = vec4(1.0, 1.0, 1.0, 1.0);
// ambient term
vec4 ambient = mat_ambient * gl_LightSource[0].ambient;
// diffuse color
vec4 kd = mat_diffuse * gl_LightSource[0].diffuse;
// specular color
vec4 ks = mat_specular * gl_LightSource[0].specular;
// diffuse term
vec3 lightDir = normalize(gl_LightSource[0].position.xyz - vpos);
float NdotL = dot(n, lightDir);
if (NdotL > 0.0)
diffuse = kd * NdotL;
// specular term
vec3 rVector = normalize(2.0 * n * dot(n, lightDir) - lightDir);
vec3 viewVector = normalize(-vpos);
float RdotV = dot(rVector, viewVector);
if (RdotV > 0.0)
specular = ks * pow(RdotV, shininess);
gl_FragColor = ambient + diffuse + specular;
}
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