Passing Texture2D pointer to Android Plugin to write on

Hello,

I would like to call an android plugin function with in parameter a texture2D pointer (tex.GetNativeTexturePtr()).

I had try to pass GetNativeTexturePtr as Byte array like below but it crash app:

Function declaration in NativeJavaBridge.cpp ("[B" if for specify a byte array in parameter):

Code (csharp):

1. getMyFunc   =  jni_env->GetMethodID(cls_JavaClass, "getMyFunc", "([B)Ljava/lang/String;"); ....
2. ....
3. const char* myFuncr(unsigned char *ptr)
4. {
5. ...
6. jstring str_ret     = (jstring)jni_env->CallObjectMethod(JavaClass, getMyFunc, ptr);
7. ....
8. }

And in JavaClass.java:

Code (csharp):

1. public String getMyFunc(byte[] ptr)
2. {
3. ...i want here write on texture buffer....
4. }
5.  

someone know how to do that ?

Regards,
Laurent

 

Ok, i found:

Unity side: tex.GetNativeTextureID()

Java side:
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, inputBuffer);

Using a power of 2 texture.

 

Do you care to share the code you used to make this work? It sounds like it is exactly what I am needing, but from my understanding, I have been unable to get it to work just yet. Any help would be immensely appreciated!

 

That is what I have running through right now. I know the ptr address is relative to the project and is coming through as "14". With this, I have an output on the Java side that is proper for the pixels (because this is where the decode of the video happens), but on the unity side, its results are always the same(~0.81), so basically not being set. Here is my current code that is not working:

Unity Side:

1.) Create the AndroidJavaClass:
static AndroidJavaClass m_ojc = new AndroidJavaClass ("com.company.app");

2.1.) Make calls across the bridge to send the pointer:
OSHookBridge.ModifyImageViewTexturePointer(m_texture.GetNativeTexturePtr());

2.2.) Here is the call from the AndroidJavaClass
public static void ModifyImageViewTexturePointer(IntPtr texturePtr)
{
m_ojc.CallStatic("ModifyImageViewTexturePointerRemoteCall", texturePtr.ToInt32());
}


The Android Java Side:

3.) The call on the other side of the bridge happens here and is receiving the pointer "14"
public static void ModifyImageViewTexturePointerRemoteCall(int texturePtr)
{
s_decodeThread.ModifyImageViewTexturePointer(texturePtr);
}

4.) Which then attempts to use the recommendations from you to update the buffer with another buffer
public void ModifyImageViewTexturePointer(int texturePtr)
{
byte [] bytes = LoadColorTest(); // This is where I create a pattern of colors in pixels
ByteBuffer buffer = ByteBuffer.wrap(bytes); // Here I wrap it in a ByteBuffer for the GL Calls below

glBindTexture(GL_TEXTURE_2D, texturePtr);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1920, 1080, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
}

I truly appreciate your help. If you can see the issue here, I will immensely appreciate it! In the meantime, i will be looking for answers.

 

OK, I spent some time and simplified the code to just have what we are talking about. Had to do this for company secrecy of course. The bug case is 591782. I have it simplified to trying to make a collection of red pixels override the pixels in the texture2d pointer every frame on the android side. It is trying to do so, but no result. I thank you in advance for any info you share.

 

So today I have taken a run at a number of other branches to play a video stream, but to no avail. Any idea from the code you saw? I have added boatloads of checks and it is indeed finding the texture from the pointer sent to Java, it "changes" data in there, but still not getting back to Unity with a change.

 

I have started a new thread for this discussion here <LINK>

 

Did you get it?

I am trying, but it doesn't work for me. I try to send a Texture from Android to Unity, controlled by a button, but it doesn't work for me.

I pass "GetNativeTextureID()" to Java and then I use the same method as you:

public void ModifyImageViewTexturePointer(int textureID)
{
Bitmap bitmap = convertFileToBitmap("fondo.bmp");
ByteBuffer buffer = bitmapToBuffer(bitmap);

glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1920, 1080, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
}

Then, I don't know how to continue, I have tried several ways in my Unity script, but I don't get the solution.

 

For anyone Googling, etc for this, the following worked for me:


// Flip texture to account for GL coordinate system
Bitmap src= ...
Matrix flip= new Matrix();
flip.setScale(1.0f, -1.0f);
Bitmap flipped= Bitmap.createBitmap(src, 0,0,src.getWidth(), src.getHeight(), flip, false);

// Bind texture and then copy data
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, glTexId);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, flipped, 0);

 

Hi we try the same send a Texture from Android to Unity with a push button but its not working can you share the demo code, did you get it?