4/7/2023 0 Comments Gamemaker studio 2 extensionsreturn myInst Īnd this final line passes the instance the extension just created back to the game - while not strictly necessary in all types of function, for the purposes of our guide here it is pretty important for other code in the game to be able to access this new instance. We changed the hardcoded values into arguments, as this allows us to pass information to the extension whenever we call the function. This is the name we will put into the extension editor inside GameMaker and then the game will know to run this piece of code. This #define line identifies the following code as a function with the name instance_create_alpha. MyInst = instance_create_layer(argument0, argument1, argument2, argument3) Īs you can see, it's similar but with some key differences: #define instance_create_alpha In our extension it would have to be like this: #define instance_create_alpha In its current form, this syntax cannot be used in an extension because it is lacking a function declaration and a return statement, plus the arguments are fixed ("hardcoded") values we can't change later. The code in GameMaker would look like the following: myInst = instance_create_layer(x, y, layer, obj) So, in the following example we will show the simple use-case of " I want to take the existing GameMaker functionality for creating an instance, but extend this with a custom alpha value I will pass in later". (Note, if using TextEdit, do not use the default of a. You may already have the code you wish to use in your extension, or know what you want to write, so how do you get this into a suitable state for GameMaker to use it? You can write the code out first of all within GameMaker itself, but this will require a fair amount of copying and pasting to get it to work, and your file needs to be a plain text one anyway, so it is recommended that you just write the code once in a basic editor such as Notepad/Textedit. The advantage of a GML extension is that you can target any platform GameMaker supports with that one bit of code. Instead, please read on.Ī common example of an extension is to create yourself a library of functions that you frequently use across all your projects - instead of adding the scripts for each function into every project, or copying and pasting code into objects in every project, you simply add the one extension file and you are good to go. However, if you're just starting out with Extensions we wouldn't suggest you dive right into analysing a full SDK. (Each SDK will have its own packaging requirements and be mostly custom code, so it's not really possible for us to put together a useful guide for this advanced level and generally we would say to just refer to your chosen SDK's own docs.) But for more practical examples and more advanced knowledge once you have followed this guide you should see our own Marketplace assets for Google/Apple/Amazon/etc., and learn the structure from them. so files.Īdditionally, Android and iOS/tvOS have the ability to import an entire source code folder into your project builds - for this, you can find an introduction to creating extensions for these platforms in this guide. You can create a simple GML extension (as we will show in this FAQ) or more advanced "library" extensions for desktop platforms, such as Windows. There is a pre-made project available for download at the bottom of this page, but we would strongly recommend you follow along with the guide and only use the supplied copy as a sanity-check if things aren't working correctly in your own attempt.Īs well as being a way of adding your own custom function libraries, extensions are often used to provide extra in-game functionality (such as integrating an external ad provider, analytics, or social features) and consists entirely of source code files - no other form of GameMaker assets are allowed. It shows how you can use the Extension Editor within GameMaker to create a new function to extend GameMaker's pre-made instance_create() function and use this new one you made in your own games. This guide provides the step-by-step process to create a GML-type Extension from scratch which will work with GameMaker. NOTE: This guide is now deprecated its contents have been merged into the manual (starting from v2.3.4) and can be found here.
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