Gigatron Glsl Shader settings and zoom

I use Glsl Shader, and in the code I changed width: 1024, height: 768. But when I take code from shadertoy it seems that it's zoomed in like 1/4. How can I get a bigger screen?

ShaderToy.prototype = {
constructor: ShaderToy.prototype,
version: '0.1.1',
mouse: new Float32Array(2), // 2
textures: [],
width: 1024, // 320 240
height: 768,
_ready: false,
_pause: false,
_vertexShader: [

Target sprite is not working yet;

Have you made more in the shader extension?

I'm a little bit confused right now, but I'm running the Colorfx extension instead and it works as it should. Many examples from shadertoy have an image that it uses in the code! how to do it.
Eg. Please login to see this link.
Here in Buffer A and Image, can you make it work Fusion?