Texture2D.LoadRawTextureData with TextureWrapMode.Repeat not working

Target Platforms Web
1

Hi,

in my game I’m loading Textures using Texture2D.LoadRawTextureData and then animate them by moving the UV coordinates of the Texture.

Behaviour on Windows / Android

This works on Windows and Android but not in WebGL where the Texture allways behaves like the TextureWrapMode is set to clamp even though I have tested that the WrapMode of the texture is properly set to Reapeat in WebGL also.

Behaviour in WebGL

This only occurs when i load the Texture via Texture2D.LoadRawTextureData.
If I use Resources.Load for example the texture behaves correctly.

Is this a bug or am I missing something?

Code to Load the Texture:

using (MemoryStream stream = new MemoryStream(data))
            {
                byte[] temp = new byte[4];

                stream.Read(temp, 0, 4);

                int width = BitConverter.ToInt32(temp, 0);

                stream.Read(temp, 0, 4);

                int height = BitConverter.ToInt32(temp, 0);

                temp = new byte[data.Length - 8];

                stream.Read(temp, 0, temp.Length);

                Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false, false);

                tex.LoadRawTextureData(temp);

                tex.Apply();

                return tex;
            }
2

Hello PatientZero.

According to the GLES 2.0.24 $3.8.2: Non-power-of-two textures must have a wrap mode of CLAMP_TO_EDGE. Which means that repeat wrap mode can not be used in WebGL 1.0 if your texture is NPOT.

There are possible ways to workaround the issue:

a) Use a power-of-two texture.

b) Use a texture with mipmaps (new Texture2D(width, height, TextureFormat.RGB24, true, false))
Explanation: the engine should then implicitly create a power-of-two texture which will emulate non-power-of-two behavior (non-power-of-two textures with mipmaps are not supported in GLES 2.0 and therefore are emulated), and as this texture is internally power-of-two, repeat wrap mode should work correctly.

If mentioned workaround does not work for you, please provide your exact Unity version.

3

Hey Alex,

thanks for pointing me in the right direction.
Using new Texture2D(width, height, TextureFormat.RGB24, true, false) however throws a UnityException: LoadRawTextureData: not enough data provided (will result in overread).

But I was able to “hack fix” this by using new Texture2D(width, height, TextureFormat.RGB24, false*, false) as before and then do*
```csharp

  •            Texture2D tex2 = new Texture2D(ReadTexture.width, ReadTexture.height, TextureFormat.RGB24, true);
          tex2.SetPixels(ReadTexture.GetPixels());
          tex2.Apply(true);*

```

My Unity Version is 5.4.2f2