Scale a container with RenderTexture on every frame

[Barduck]

Hi, I don't like to bother, but I don't sure what I'm doing and I need some guidance if it's possible...

I have two containers, one for map sprites (320x180px) and the other for UI graphics (who it's resized to native resolution, in my case 1920x1080)

My intention is to rescale map_sprites_containter and all its sprites to 1920x1080 in the most efficient way, every frame. So I came up with the idea of render a texture of map_sprites_container, convert it to a sprite and scale it. 

Is this the best way?

Some pseudo code:
var bitmap = new Bitmap(320, 180);
var renderTexture = PIXI.RenderTexture.create(320, 180);
renderer.render(map_sprites_containter, renderTexture);

var canvas = renderer.extract.canvas(renderTexture);
bitmap.context.drawImage(canvas, 0, 0);
canvas.width = 0;
canvas.height = 0;
renderTexture.destroy({ destroyBase: true });
bitmap.baseTexture.update();

var render_map_sprites = new Sprite();
render_map_sprites.bitmap = bitmap;
render_map_sprites.scale.x = 6
render_map_sprites.scale.y = 6
map_sprites_containter.addChild(render_map_sprites);

[ivan.popelyshev]

and how does it look? like 320x180px scaled to 1920x1080 with LINEAR?

[Barduck]

I use NEAREST because it's pixel art. I'm at work in this moment so I can't show you but looks okay.

Do you think that this way of doing it can have big impact on performance?

[ivan.popelyshev]

I honestly dont know why do you need "extract" and "destory" here. just re-use the same renderTexture every time it changes. It can give you extra perf if your UI is flilrate-heavy, like, filling the same area 10 times.

Edited August 26, 2020 by ivan.popelyshev

[ivan.popelyshev]

extract uses readPixels which is slow. I dont understand whats your "bitmap", is it RMMZ thing?

If its RMMZ, find a way to swap texture inside bitmap to RenderTexture.

[Barduck]

Oh I see, thank you Ivan!

Yes I'm experimenting with RMMZ framework, nothing serious mostly for learning.

So I'm in the right way, I need to adjust that things you pointed me. Thank you again