Alpha 8 Support on Windows Store Apps

Unity Engine
,
1

Hi,

I seem to be running into a bug in which Alpha8 images are being used as 32-bit RGBA textures in Windows Store Apps. Unity Profiler shows the texture usage of the 1024x1024 image as 1.0MB, but using the DirectX debugger in VS2015 and Windows Performance Analyzer, it shows the texture being uploaded as true color.

Texture Settings in Editor:

2348137--158933--alpha-8-editor.png
2348137--158933--alpha-8-editor.png1920×1080 153 KB

Reported by Unity Profiler:

2348137--158934--alpha-8-unity.png
2348137--158934--alpha-8-unity.png1920×1080 122 KB

Visual Studio DirectX diagnostic tool:

2348137--158935--alpha-8-dx.png
2348137--158935--alpha-8-dx.png1920×1080 151 KB

Is this a known bug, or are Alpha 8 images unsupported on Windows apps? Unity version is 5.2.1f1

2

Repro Project is at Dropbox - Error - Simplify your life. (I can’t seem to upload it here, even though it’s 2MB)

3

It probably depends on DX11 feature level, also please submit a bug via bug reporter.