AndroidGLKit provides OpenGL ES 2.0 boilerplate codes for Android. You can implement OpenGL 2.0 things easily by using AndroidGLKit.
dependencies {
...
implementation 'kr.pe.burt.android.lib:androidglkit:1.0.1'
}AndroidGLKit provides GLKActivity or GLKFragments. Also it has GLKAppCompatActivity and GLKSupportFragment. You can extends above activity or fragment like below.
public class TextureActivity extends GLKAppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
protected void onStart() {
super.onStart();
glkView.setGLKRenderer(new TextureRenderer(this));
}
}Notice that above code does not have set layout code setContentView(R.layout.texture_activity). Because AndroidGLKit provides default layout file as common_glk_view.xml like below:
<?xml version="1.0" encoding="utf-8"?>
<kr.pe.burt.android.lib.androidglkit.GLKView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/glkView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</kr.pe.burt.android.lib.androidglkit.GLKView>If you extends activity or fragment that GLKit provides, you don't need to have layout file.
Of course, You don't like the above approach. Therefore, You can use custom layout file like below:
public class SquareActivity extends GLKAppCompatActivity {
@Override
protected int getLayoutFileResourceId() {
return R.layout.activity_square;
}
@Override
protected void onStart() {
super.onStart();
glkView.setGLKRenderer(new SquareRenderer(this));
}
}Override getLayoutFileResourceId method and return resource id for your layout file. R.layout.activity_square looks like below:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:glk="http://schemas.android.com/apk/res-auto"
tools:context="kr.pe.burt.android.lib.androidglkit.app.SquareActivity">
<kr.pe.burt.android.lib.androidglkit.GLKView
android:id="@+id/glkView"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>Important thing is GLKView must have android:id as glkView. It is rule for using AndroidGLKit.
GLKRenderer takes responsibility for draw something on OpenGL ES Context. Maybe your opengl codes to be in here. The Simplest renderer is blank renderer like below:
public class BlankRenderer implements GLKRenderer {
@Override
public void init(GLKView view) {
}
@Override
public void onSizeChanged(GLKView view, int width, int height) {
GLES20.glViewport(0, 0, width, height);
}
@Override
public void update(GLKView view, long dt) {
GLES20.glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
}
}If you have implemented GLKRenderer, you should set it to GLKView like below:
@Override
public void onStart() {
super.onStart();
glkView.setGLKRenderer(new BlankRenderer());
}It's all :) If you run the above code, You can see the result screen like below:
You can get bitmap from OpenGL ES context easily like below:
@Override
protected void onStart() {
super.onStart();
GLKPixelBuffer pb = new GLKPixelBuffer(300, 300);
Bitmap bitmap = pb.getBitmap(new SquareRenderer(this));
imageView.setImageBitmap(bitmap);
pb.destroy();
}Enjoy OpenGL ES 2.0 with AndroidGLKit!
The MIT License (MIT)
Copyright (c) 2016 Sungcheol Kim, https://github.com/skyfe79/AndroidGLKit
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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