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Votes

1

Found in

2020.3

2021.1

2021.2

Issue ID

1321754

Regression

No

[WebGL] Alpha values are black when a texture is created from the downloaded image file

WebGL

-

If one creates a Texture that is downloaded from a file, it is properly created with alpha on other platforms, but that does not work on WebGL.

How to reproduce:
1. Open the attached project
2. Make a WebGL build
3. Host the built WebGL Player
4. Open the WebGL Player in a browser
5. In the Player, click on the "Load a new texture" button
6. Select an image that has transparency
7. Preview the loaded image

Expected result: The image has a transparent background
Actual result: The image has a black background

Reproducible with: 2020.3.1f1, 2021.1.0f1, 2021.2.0a7
Couldn't test with: 2018.4.33f1, 2019.4.22f1 ("TypeError: Cannot read property 'addEventListener' of null" is thrown when clicking the "Load new texture" button), 2021.2.0a8, 2021.2.0a9 (Errors when trying to build the WebGL Player)

  1. Resolution Note:

    User's project included a JavaScript plugin to handle the upload of the image file from the user. The upload resized the image to ensure a maximum texture size of 1024x1024 pixels. Unfortunately the resize function encoded the resized image as JPEG and lost the alpha channel. When the resize_image function is adjusted to generate an image/png then the texture upload works ok with an alpha channel.

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