JS1k: The JavaScript code golfing competition

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

(function() {

var vertex_shader_code="attribute vec3 V;varying float Z;void main(void) { float N=0.0;float O=1.0;vec4 v=vec4(V,1);v.z+=(sin(T*3.0+v.x)+cos(T*2.0+v.y*1.5));gl_Position=mat4(7,N,N,N,N,7,N,N,N,N,-O,-O,4.0*sin(T),4.0*sin(T/2.0),N,O)*v;Z=O-gl_Position.z/50.0;}";

var fragment_shader_code="varying float Z;void main(void){ gl_FragColor=vec4(Z,Z,Z,1);}";

// DEMO: Spacetrain

// document.write('see console');
// if (typeof(a) !== 'undefined') console.log('demo canvas', a);
// if (typeof(b) !== 'undefined') console.log('demo body', b);
// if (typeof(c) !== 'undefined') console.log('demo 2d context', c);
// if (typeof(g) !== 'undefined') console.log('demo gl', g);
// console.log('RAF', requestAnimationFrame);

//
//
// GLOBALS
//
//

// prog;
TU = 0;
T = 0;

//
//
// FRAME LOOP
//
//

// function p(n) { vertices.push(n) }

nstars = 5000;
nextra = 20;
nlines = 90;

randoms = [];

// R = Math.random;
for(k=0; k<nstars; k++) randoms.push(Math.random() * 2 - 1);

// console.log(vertices);

function F() {

  g.clearColor(0, 0, 0, 1);
  // g.enable(g.DEPTH_TEST);
  // g.depthFunc(g.LEQUAL);
  g.clear( 16384/*g.COLOR_BUFFER_BIT*/ );
  //  g.useProgram(prog);

  vertices = [];
  C = 0;

  // X=0;
  // Y=0;
  // Z=0;

  function p() {
    vertices[C++] = X;
    vertices[C++] = Y;
    vertices[C++] = Z;
    // vertices=vertices.concat([x,y,z]);
    // C += 1;
  }

  for( k=0; k<nstars; k++) {
    Z = (k+T*9)%30-15;
    X=randoms[k]*2;
    Y=randoms[k+1]*2;
    // Z=z;
    p(); // randoms[k]*2, randoms[k+1]*2, z);
    Z-=.1;
    p(); // randoms[k]*2, randoms[k+1]*2, z+.1);
  }

  // W = 1;
  // D = 2;

  function M() {
    return Math.sin(Z / 9 + T) / 2 - 1.5;
  }

  // add rails
  for( k=0; k<nlines; k++) {
    Z=-k;
    //  ZZ = -k;
     // h = ;
     // H = ;
    Y=M();
    X=-1;
    // Z=ZZ;
    p(); // p(-W, h, ZZ);
    Z++;//=1;
    Y=M();
    // Z=ZZ;
    p(); // p(-W, H, ZZ+1);
    X=1;
    // Y=;
    // Z--;//=1;//ZZ;
    p(); // p(W, h, ZZ);
    Z--; //=1;
    Y=M();
    p(); // p(W, H, ZZ+1);
  }

  // add segments
  S = 8;
  for(k=0; k<nextra; k++) {
    Z = -k*S+(T*30)%S;
    // H = ;
    X=-1;
    Y=M();
    // Z=ZO;
    p(); // (-W, H, ZO);
    X=1;
    p(); // (W, H, ZO);
  }

  g.bufferData(34962/*g.ARRAY_BUFFER*/, new Float32Array(vertices), 35044/*g.STATIC_DRAW*/);
  // console.log(g.FLOAT);
  // console.log(g.LINES);
  g.uniform1f(TU, T);
  g.drawArrays(1/*g.LINES*/, 0, C/3);// nstars*12 + nextra*3);

  requestAnimationFrame(F);
  T += .01;
}

//
//
// SET UP
//
//

function getShader(type, theSource) {
  S = g.createShader(type);
  g.shaderSource(S, "precision lowp float;uniform float T;" + theSource);
  g.compileShader(S);
  // if (!g.getShaderParameter(shader, g.COMPILE_STATUS)) {
  //   alert("An error occurred compiling the shaders: " + g.getShaderInfoLog(shader));
  //   return null;
  // }
  g.attachShader(P,S);
}

// Create the shader program
P = g.createProgram();
getShader(35633/*g.VERTEX_SHADER*/, vertex_shader_code);
getShader(35632/*g.FRAGMENT_SHADER*/, fragment_shader_code);
g.linkProgram(P);
// if (!g.getProgramParameter(prog, g.LINK_STATUS)) {
//   alert("Unable to initialize the shader program.");
// }

g.useProgram(P);
VPA = g.getAttribLocation(P, "V");
TU = g.getUniformLocation(P, "T");

g.bindBuffer(34962/*g.ARRAY_BUFFER*/, g.createBuffer());
g.vertexAttribPointer(VPA, 3, 5126/*g.FLOAT*/, 0, 0, 0);
g.enableVertexAttribArray(VPA);

//
//
// START EVERYTHING
//
//

F();


})();