initialize

README.md

@@ -0,0 +1,34 @@
+webglew
+=======
+*WebGL* *E*xtension *W*rangler.  Manages WebGL extensions so you don't have to.
+
+Usage
+=====
+First, install using npm:
+
+    npm install webglew
+
+Then you can pull in a list of extensions by passing it a WebGL context:
+
+    var gl = require("gl");
+    var ext = require("webglew")(gl);
+
+    if(ext.OES_texture_float) {
+      console.log("GL context supports floats!");
+    } else {
+      console.log("No floating point textures :'(");
+    }
+
+`require("webglew")(gl)`
+------------------------
+To use the library, call the module with a WebGL context and it will return a JavaScript object with a list of properties.  For convenience, extensions with a vendor specific prefix are aliased to the root WEBGL_* name.  For example,
+
+    WEBKIT_WEBGL_lose_context
+
+Becomes:
+
+    WEBGL_lose_context
+
+Credits
+=======
+(c) 2013 Mikola Lysenko. BSD

webglew.js

@@ -0,0 +1,35 @@
+"use strict";
+
+var VENDOR_PREFIX = [
+  "WEBKIT_",
+  "MOZ_"
+];
+
+function baseName(ext_name) {
+  for(var i=0; i<VENDOR_PREFIX.length; ++i) {
+    var prefix = VENDOR_PREFIX[i];
+    if(ext_name.indexOf(prefix) === 0) {
+      return ext_name.slice(prefix.length);
+    }
+  }
+  return ext_name;
+}
+
+function initWebGLEW(gl) {
+  if(gl._webglew_struct) {
+    return gl._webglew_struct;
+  }
+  var extensions = {};
+  var supported = gl.getSupportedExtensions();
+  for(var i=0; i<supported.length; ++i) {
+    var ext = gl.getExtension(supported[i]);
+    if(!ext) {
+      continue;
+    }
+    extensions[supported[i]] = ext;
+    extensions[baseName(supported[i])] = ext; //Add version without VENDOR
+  }
+  gl._webglew_struct = extensions;
+  return extensions;
+}
+module.exports = initWebGLEW;