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By Design
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
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)
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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.