GMLive.gml for GameMaker

Code and asset live-reloading for GameMaker! · By YellowAfterlife

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[Solved] Tile layers break on Room Reload

A topic by cookiedraggy created Nov 22, 2020 Views: 319 Replies: 3

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cookiedraggy4 years ago (1 edit)

I have the following setup:

Room reloading is setup as per manual, and is working. If I paint tiles, it reflects in the running game without any issues.
I created a function "create_collisions" which creates obj_collision instances for each solid tile.
The function gets called in the create event of obj_make_collision
I have placed one instance in the actual room and it does it's job without issues when I launch the game.
After a few seconds the room reloads (even if I didn't make any changes) and all solid instances disappear.
I tried to fix the problem by calling the function also in the room start event, but it didn't work.
To further investigate, I put the function call into the Begin Step event, but it would not create any collision objects.
I investigated further using show_debug_message and found the following:
- After reloading layer_get_id gives back a different value.
- layer_tilemap_get_id switches to giving back -1 upon the refresh, which means after reload I cannot get access to the the tilemap data anymore.

Here's my function for reference:

function create_collisions()
{
   var _layer = layer_get_id("Tiles_1");
   var _tileLayer = layer_tilemap_get_id(_layer);

   show_debug_message(_layer);

var wt = tilemap_get_width(_tileLayer);
var ht = tilemap_get_height(_tileLayer);

   for(var i = 0; i < wt; i++)
   {
       for(var j = 0; j < ht; j++)
       {
           var tile = tilemap_get(_tileLayer, i, j);

           if(tile == 1)
           {
               instance_create_layer(i*32, j*32, "Instances", obj_collision);
           }
       }
   }
}

I'd be happy to send a small test project.

cookiedraggy4 years ago

If I just run "show_debug_message(layer_tilemap_get_id("Tiles_1"));" in the step event of an object it outputs an ID "4" at first and after the reload it switches to -1. But if I enumrate through all layer elements with layer_get_all_elements for Tiles_1 it tells me there is still a tile layer.

YellowAfterlifeDeveloper4 years ago

As per GM manual, layer_get_tilemap does not work for anything created at runtime, which includes GMLive. I was at one point told that this will be addressed in 2.3, but that has not happened just yet.

A workaround would be like:

function layer_tilemap_get_id_fixed(_layer) {
    var els = layer_get_all_elements(_layer);
    var n = array_length_1d(els);
    for (var i = 0; i < n; i++) {
        var el = els[i];
        if (layer_get_element_type(el) == layerelementtype_tilemap) {
        	return el;
        }
    }
    return -1;
}

cookiedraggy4 years ago

Ah sorry for wasting your time, I completely missed that! Thank you!

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GMLive.gml for GameMaker

[Solved] Tile layers break on Room Reload