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tomlee

Member Since 14 Nov 2011
Offline Last Active Nov 24 2012 08:04 PM

Posts I've Made

In Topic: OpenGL for Linux and MacOSX?

22 November 2012 - 03:43 PM

On CentOS/RHEL, you're probably after the mesa-libGL-devel package. :)

http://rpm.pbone.net/index.php3/stat/4/idpl/17834939/dir/centos_5/com/mesa-libGL-devel-6.5.1-7.10.el5.i386.rpm.html

In Topic: load external text file (shader) in javascript (WebGL)

14 November 2011 - 10:39 PM

Hi,

this will be exotic :)
I'm trying to load an external text file from javascript, so that I can load it as a shader later. The file is loaded successfully, however when I try to access its contents I can't.
I checked with firebug if it is loaded properly, and it was. When I try to access its content by using this:

function load_external_script(filename, type)
{
  var script = document.createElement('script');
  script.type = type;
  script.src = filename;
  script.setAttribute('id', filename);
  head.appendChild(script);
}

function getShader(gl, id)
{
  var shaderScript = document.getElementById(id);
  if (!shaderScript)
  {
	return null;
  }

  var str = shaderScript.text;
...
}

load_external_script('vertex.vs', 'text/plain');
var fragmentShader = getShader(gl, "vertex.vs");

the str = ... line triggers an unexpected EOF error, and I checked: both text and innerHTML properties are empty despite the content is there... any ideas how can I get it?

or is there another way of loading shaders from external source?

I took the basic source from http://learningwebgl.com/blog/?p=28

here's the uploaded file:
link

Best regards,
Yours3!f


Easy: use AJAX! :)

XMLHttpRequest.responseText will give you direct access to the source of a shader. (Alternatively you can use the nicer JQuery or Prototype equivalents).

Problem is you'll want to process the response asynchronously, which may complicate your initialization a little.

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