20141205

20141205.fs

#define PI 3.1415926

void main(void)
{
    vec2 uv=vec2(gl_FragCoord.xy-iResolution.xy/2.0);
    vec2 mouse=vec2(iMouse.xy-iResolution.xy/2.0);
    
    if(length(uv)<100.0)
    {
        vec3 nor=vec3(0.0);
        nor.z=cos(length(uv)/100.*PI/2.);
        nor.xy=normalize(uv);
        nor.xy*=abs(sin(length(uv)/100.*PI/2.));
        
        vec3 lig=vec3(mouse*.01,-1.0);
        vec3 cam=vec3(0.0,0.0,-1.0);
        
        float dif=clamp(dot(-nor,lig)*.5,0.0,1.0)*.6;
        float amb=.6;
        float spe=clamp(pow(dot(-nor,normalize(lig+cam)),15.0),0.0,1.0)*.2;
        gl_FragColor=vec4(vec3(0.9,0.7,0.6)*(dif+amb)+vec3(1.0)*spe,1.0);
    }
    else
    {
        gl_FragColor=vec4(0.0,0.0,0.0,1.0);
    }
}