xiaozhikang0916 / UnityExternalTexture

UnityExternalTexture

Create and update texture in Android Java code, and show it in Unity3D scene.

中文README

Download apk

##Environment My building environment:

• Windows 10
• Android Studio 1.5 (Then update to 2.0)
• Unity3D 5.3.4f1 Pro
• Target phone: Samsung S6 and OnePlus in Android 6.0.1

##Build Open the AndroidProject in Android Studio.

Make Project.

Open \AndroidProject\app\build\outputs\aar\app-debug.aar as zip file and delete libs\classes.jar

Copy(or replace) the above app-debug.aar file to \UnityProject\Assets\Plugin\Android\bin (or anywhere you want but the .aar file can't be duplicated)

Open the UnityProject in Unity.

Build apk and run in your Android phone

Notice When installed, there will be 2 icons of this app, one of which leads to a wrong Activity. Make sure you start this app from the second icon.

##How it works Click the first button in the top-left corner, the plane in the buttom will show a picture.

Click the second button, the plane will show another picture. ###Create When you click the first button, Unity will call a method defined in Android Java code updateTexture, in which method a new texture will be created and rendererd with a picture, then returnd as a pointer.

//Unity code
int pointer = androidNativeCamActivity.Call<int>("updateTexture");

//Java code 
public int updateTexture(){
    nativeTexturePointer = createExternalTexture();
    ...
    bitmap = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.test, options);
    ...
    return nativeTexturePointer;
}

Then a texture will be created by the pointer in Unity and attach to the plane

//Unity code
Texture2D t = Texture2D.CreateExternalTexture(440, 220, TextureFormat.ARGB32, false, true, new IntPtr(pointer));
plane.GetComponent<Renderer>().material.mainTexture = t;

###Update When the second button is clicked, the texture of the plane will be updated but not creating a new one.

//Unity code
androidNativeCamActivity.Call("updateTexture2");

//Java code
public void updateTexture2() {
    ...
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, nativeTexturePointer);
    ...
    GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
    ...
}    

##Todo ###Duplicated Launcher Activities Now it has 2 icons and launcher activities, one of which leads to a wrong scene and can't use the functions.

###Save texture as file in Unity Try to save the external texture as file in Unity, but cannot read the data in it.

Tried:

• GetRawTextureData() returns byte array length 0
• EncodeToJPG/PNG returns byte array length 0
• GetPixels32() returns Color array with all nodes valued (0, 0, 0, 0)