Loading DXT1 files at runtime - using Graphics API OpenGLES3

Hi Everyone

Unity 2019.1.6f1

I have an app that I'm moving over to OpenGLES3 and one of the components loads DXT1 files at runtime to aid in loading time into a Texture2d.

I followed this thread - which previously worked really well!
https://answers.unity.com/questions/555984/can-you-load-dds-textures-during-runtime.html

With only making 2 changes to my project settings,
Graphics API - OpenGLES3
Color Space - Linear

I now can't use DXT1 files, and reports this error -

'DXT1' is not supported on this platform. Decompressing texture. Use 'SystemInfo.SupportsTextureFormat' C# API to check format support.

Is this expected ? and is there another way to load png/jpg files into a Texture2d at speeds comparable to the dds method mentioned in that thread?

Thanks in advance
Brian

 

Hi Alek
Thanks for your reply.

Would the workflow be in principle similar?
convert png/jpg -> ETC2/ASTC (offline, store somewhere on disk or on a server) then load at runtime with the speed benefits?

Thanks in advance
Brian

 

Sure, that is certainly one option however my interests are for texture streaming at runtime.
Backgrounds that are stored on a Amazon S3 bucket and I'll be updating them with out updating the app.
Prior to this - I was streaming 4k DXT1 files and the load time's were reasonable however when I switch to jpg or png, it became super slow, which is what lead me to look into DXT1 as its mapped out and ready to display.

Would you happen to have any suggestions around what the best solution to loading images at runtime off a server?

This is what I'm currently using

UnityWebRequest www = UnityWebRequestTexture.GetTexture(eachExperience.movie.image_path);
yield return www.SendWebRequest();
if (www.isNetworkError || www.isHttpError)
{
Debug.Log(www.error);
}
else
{
AddTextureToCache(Utilities.ReturnHashId(eachExperience.movie.image_path), ((DownloadHandlerTexture)www.downloadHandler).texture, eachExperience.movie.image_path, false);
}


Thank you again

 

Hi Karl

Nope, my noob status shines at this moment.
Thanks for pointing them out
Much appreciated.

 

Hi there

Thanks for the tips about all of this,

I seem to get a warning that 'ASTC_RGB_4x4' is not supported on this platform. Decompressing texture. Use 'SystemInfo.SupportsTextureFormat' C# API to check format support.

When debugging
Windows SystemInfo.SupportsTextureFormat(TextureFormat.ASTC_4x4) reports False
Android/Oculus Go reports True

What I don't understand is that the the image still is shown on both platforms, what does the warning message actually reporting then?

Thanks again
Brian

 

From the Unity documentation:

See "all supported texture formats" section:
https://docs.unity3d.com/Manual/class-TextureImporterOverride.html

 

found this issue on ios device
texture creation failed. 'DXT1' is not supported on this platform. Use 'SystemInfo.SupportsTextureFormat' C# API to check format support.
UnityEngine.Texture2D:.ctor(Int32, Int32, TextureFormat, Int32, Boolean, IntPtr)
<DownloadImage>d__17:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)
PlayerDetails:SetProfilePicInProfileScreen()
LoadDataCitySelectionScreenrofielResponseGuestUser(Boolean, Response, String)
System.Action`3:Invoke(T1, T2, T3)
<StartRequestCoroutine>d__12`2:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

 

iOS doesn't support DXT1. Instead, use a texture format that's supported like PVRTC.

You can find more information about this in the documentation at https://docs.unity3d.com/Documentation/Manual/class-TextureImporterOverride.html.