dup matrix

[GoogleCodeExporter]

very important to use the array dup

mat4.dup = function(mat){
   return new glMatrixArrayType(mat);
}

Original issue reported on code.google.com by denis.ra...@gmail.com on 23 Jul 2010 at 1:07

[GoogleCodeExporter]

doesn't work with arrays as glmatrixtype

Original comment by jeroom832@gmail.com on 3 Aug 2010 at 4:36

[GoogleCodeExporter]

Original comment by Tojiro@gmail.com on 10 Oct 2010 at 3:58

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

I'm a bit torn on this, since I want the library to work with browsers that 
lack WebGL support (arrays only) but would very much like the speed benefits of 
using the copy functions. I could test what's available with every copy, or 
defer to a function, but in either of those cases the additional overhead 
potentially cancels out the benefit of the native copy. :( I'll give this one 
some more thought.

Original comment by Tojiro@gmail.com on 10 Oct 2010 at 4:07

• Changed state: Accepted

[GoogleCodeExporter]

Here is a proposal for the two cases with dup:

mat4.dup = function(mat){
   if (glMatrixArrayType == Array) {
        var dest = new glMatrixArrayType(16);

        if(mat) {
                dest[0] = mat[0];
                dest[1] = mat[1];
                dest[2] = mat[2];
                dest[3] = mat[3];
                dest[4] = mat[4];
                dest[5] = mat[5];
                dest[6] = mat[6];
                dest[7] = mat[7];
                dest[8] = mat[8];
                dest[9] = mat[9];
                dest[10] = mat[10];
                dest[11] = mat[11];
                dest[12] = mat[12];
                dest[13] = mat[13];
                dest[14] = mat[14];
                dest[15] = mat[15];
        }

        return dest;
   } else {
     return new glMatrixArrayType(mat);
   }
}

Original comment by denis.ra...@gmail.com on 19 Oct 2010 at 2:09

[GoogleCodeExporter]

We will be adding this to https://github.com/feisty/math

Please come and lodge an issue https://github.com/feisty/math/issues

Original comment by pyrotech...@gmail.com on 15 Dec 2010 at 12:29

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

I think the best way is to add a function to array and Float32Array this way:

Array.prototype.copy = function() {
    var b = [];
    b[0] = this[0];
    b[1] = this[1];
    ...
    return b;
}
and
Float32Array.prototype.copy = function() {
    return new Float32Array(this);
}

and

mat4.dup = function(mat){
    return mat.copy();
}

Original comment by danielhe...@gmail.com on 28 Feb 2011 at 8:51

[GoogleCodeExporter]

another option is to create just the same function

mat4.dup = function(mat){
    var dest = new glMatrixArrayType(16);
    dest[0] = mat[0];
    dest[1] = mat[1];
    ...
}

Original comment by danielhe...@gmail.com on 28 Feb 2011 at 8:57