asciiblaster

- draw irc art in your web browser
git clone git://git.acid.vegas/asciiblaster.git
shader.js (1444B)
      1 var shader = (function(){
      2   var fn_str, fn, lex
      3   var exports = {}
      4   var animating = false
      5   
      6   exports.init = function(){
      7     lex = new Lex (0, 0)
      8     exports.build(demo_shader.innerHTML)
      9   }
     10   exports.build = function (fn_str){
     11     try {
     12       new_fn = new Function('lex', 'x', 'y', 'w', 'h', 't', fn_str)
     13       new_fn(lex, 0, 0, 1, 1, 0)
     14     }
     15     catch (e) {
     16       throw 'Shader execution error'
     17     }
     18     exports.fn = fn = new_fn
     19     return fn
     20   }
     21   exports.run = function(canvas){
     22     var t = +new Date
     23     shader.canvas = shader.canvas || canvas
     24     var w = shader.canvas.w, h = shader.canvas.h
     25     shader.canvas.forEach(function(lex, x, y){
     26       fn(lex, x, y, w, h, t)
     27       lex.build()
     28     })
     29   }
     30   exports.toggle = function(state){
     31     animating = typeof state == "boolean" ? state : ! animating
     32     shader_fps_el.classList.toggle('hidden')
     33     return animating
     34   }
     35   exports.pause = function(){
     36     animating = false
     37     shader_fps_el.classList.add('hidden')
     38     shader.fps_time = 0
     39   }
     40   exports.play = function(){
     41     animating = true
     42     shader_fps_el.classList.remove('hidden')
     43   }
     44   exports.animate = function (t){
     45     requestAnimationFrame(exports.animate)
     46     if (! animating) { return } 
     47     if (shader.fps_time){
     48       var ms = Date.now() - shader.fps_time
     49       fps = 1000 / ms
     50       shader_fps_el.innerHTML = (fps | 0) + ' fps'
     51     }
     52     shader.fps_time = Date.now()
     53     exports.run(canvas)
     54   }
     55   
     56   return exports
     57 
     58 })()