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function shader (x,y,t,d) {}
var shader_build = function(){
var fn_str = document.getElementById('shader').value
if (!fn_str.length) fn_str = ""
try {
var fn = new Function('x','y','t','d', fn_str)
shader = fn
shade = shade_error_handling
} catch (e) {
try {
acorn.parse(fn_str)
} catch(e){ //e.loc = {column: 0, line: 1} line is 1-based
error_highlight.on(e.loc.line-1)
}
throw Error ("Shader compilation error")
}
}
var r,g,b,a;
var w, h, actual_w, actual_h;
function shade_no_error_handling(frame, t){
if (! t || isNaN(t)) throw Error ("No time specified")
if (! frame) throw Error ("No frame specified")
var imgData = frame.ctx.getImageData(0,0,w,h)
var data = imgData.data
var clone = frame.cloneData.data
var realw = w, realh = h, v, index
for (var x = 0; x < w; x++) {
for (var y = 0; y < h; y++) {
q = 4*(y*w+x)
r = data[q], g = data[q+1], b = data[q+2], a = data[q+3]
result = shader(x,y,t,clone)
data[q] = r
data[q+1] = g
data[q+2] = b
data[q+3] = a
w = realw, h = realh
}
}
cc.putImageData(imgData,0,0)
}
var chrome_stack_regexp = /<anonymous>:([0-9]+)/;
var firefox_stack_regexp = /:([0-9]+)$/;
function shade_error_handling(frame, t){
if (! t || isNaN(t)) throw Error ("No time specified")
if (! frame || ! frame.ctx || ! frame.cloneData) throw Error ("No frame specified")
var imgData = frame.ctx.getImageData(0,0,w,h)
var data = imgData.data
var clone = frame.cloneData.data
try {
var realw = w, realh = h, v, index
for (var x = 0; x < w; x++) {
for (var y = 0; y < h; y++) {
q = 4*(y*w+x)
r = data[q], g = data[q+1], b = data[q+2], a = data[q+3]
result = shader(x,y,t,clone)
data[q] = r
data[q+1] = g
data[q+2] = b
data[q+3] = a
w = realw, h = realh
}
}
}
catch(e){
var lines = (e.stack + "").split('\n')
if (lines[0].substr(0,10) === "anonymous@") { // firefox
var matches = lines[0].match(firefox_stack_regexp)
if (matches.length > 1)
error_highlight.on(parseInt(matches[1]) - 5)
} else if (lines.length > 1) { // attempt chrome match
var matches = lines[1].match(chrome_stack_regexp)
if (matches && matches.length > 1)
error_highlight.on(parseInt(matches[1]) - 3)
}
// console.log(e.stack)
throw Error ("Shader execution error")
}
cc.putImageData(imgData,0,0)
shade = shade_no_error_handling
error_highlight.off()
}
shade = shade_error_handling
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