Do you want to use the same shaders as Shadertoy? Do you want to use GLSL 3.0 ES shaders? Yeah, I have prepared this template for you!
Paste the shader into the "Let's paste your shader here!" section of the HTML file, and you will be able to use the shader with the `mainImage` function!
Excuse me, but I don't support texture import in `iChannel` yet. Only the back buffer is supported with the uniform `backBuffer`. You can use `#define iChannel0 bachBuffer` if you like.
Enjoy shader coding with GLSL3.0 ES!