To get a screen effect up and running inside of Unity, we need to create a script and shader. The script drives the real-time update in the editor and is also responsible for capturing the RenderTexture from the main camera and passing it to the shader. Once the RenderTexture gets to the shader, we can use the shader to perform per-pixel operations.
At the start of the script, we perform a few checks to make sure that the current selected build platform actually supports screen effects and the shader itself. There are instances where a current platform will not support screen effects or the shader that we are using. So, the checks that we do in the Start() function ensure we don't get any errors if the platform doesn't support ...
