Collision Mask Identifiers / Multiple Collision Masks

[AnseloOriginal]

This is a feature that allows the creation of multiple collision masks. The masks are automatically numbered, with the first one created by the system during sprite creation being numbered #0.

Features:

1. Multiple Collision Masks: This is useful for testing different collisions on different parts of an object, such as a human sprite, rather than creating multiple sprites.

2. Automatic Numbering by the Engine: The system automatically numbers the collision masks.

I think this is feasible because, although you can already create more than one collision mask, you currently can’t use them separately.

[jjhesk]

see if this works:

// MultipleCollisionMasks.js
// Extension for GDevelop to support collision checks with specific mask IDs

const extension = new gdjs.Extension();

// Metadata
extension.setExtensionInformation(
  "MultipleCollisionMasks",
  "Multiple Collision Masks",
  "Allows checking collisions for specific collision masks of a sprite object using mask IDs.",
  "Your Name",
  "MIT"
);

// Condition: Check collision with a specific mask
extension
  .addCondition(
    "CheckCollisionWithMask",
    "Check collision with specific mask",
    "Checks if a specific collision mask of an object collides with another object.",
    "Mask _PARAM2_ of _PARAM0_ collides with _PARAM1_",
    "Collisions",
    "res/conditions/collision24.png"
  )
  .addParameter("object", "Object with multiple collision masks", "", false)
  .addParameter("object", "Object to check collision against", "", false)
  .addParameter("number", "Mask identifier (e.g., 0, 1, 2)", "", false)
  .setFunctionName("gdjs.evtTools.collision.checkCollisionWithMask");

// Runtime function to handle the collision check
gdjs.evtTools.collision = gdjs.evtTools.collision || {};
gdjs.evtTools.collision.checkCollisionWithMask = function(obj1, obj2, maskId) {
  if (!obj1 || !obj2) return false;

  // Assume obj1 is a SpriteRuntimeObject with _collisionMasks array
  const sprite1 = obj1;
  const mask = sprite1._collisionMasks ? sprite1._collisionMasks.find(m => m.id === maskId) : null;

  if (!mask) return false;

  // Perform collision check using the specific mask's shape
  // This assumes the runtime has been modified to support mask.shape
  return gdjs.RuntimeObject.collisionTest(obj1, obj2, mask.shape);
};

// Register the extension
gdjs.registerExtension(extension);