Sign in to follow this  
khaninD

Parallax scroller very much slows down on the phone

Recommended Posts

        const width = window.innerWidth;
        const height = window.innerHeight;
        const imgWidth = 3500;
        const imgHeight = 1589;
        const app = new PIXI.Application(
          {
            width,
            height,
            transparent: true
          }
        );
        const u = new SpriteUtilities(PIXI);
        const bg = u.tilingSprite("./src/bg.png", imgWidth, imgHeight);
        imageScale({imgWidth, imgHeight}, bg);
        app.stage.addChild(bg);
        app.ticker.add(parallaxFn);
        document.getElementById('app').appendChild(app.view);

        function parallaxFn() {
          bg.tilePosition.x -= 5;
        }

        function imageScale({imgWidth, imgHeight}, sprite) {
          const widthRatio = width / imgWidth;
          const heightRation = height / imgHeight;
          sprite.scale.x = widthRatio;
          sprite.scale.y = heightRation;
        }

i use 

https://cdnjs.cloudflare.com/ajax/libs/pixi.js/4.5.1/pixi.min.js

And I have (see image file) after one minute, this only on mobile

Screenshot_20180126-155941.png

Share this post


Link to post
Share on other sites

TilingSprite uploads transformation matrix to GL uniform. The problem is that the precision of operations with floats on shader-side is low compared to our good old 32-bit floats. The biggest numbers are in matrix, the bigger quantifier of numbers that shader computes - you see this picture above. The fix is to trim the number before it becomes too big.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.