So the room size must always be 620x240??
Viewing post in Advanced CRT Shader for GameMaker comments
Hello,
The room size can be anything you like! By default, the example project uses the Viewport 0 surface as the source for the CRT screen. That surface gets drawn directly to the real-life screen using a shader. Setting the game_width and game_height variables in the provided CRT object will automatically resize your viewport to whatever you specify. Your game's rooms themselves are free to vary in size to accommodate scrolling, etc. Be sure to take a look at the provided documentation for in-depth explanations of the underlying systems.