Merge pull request cats-oss#208 from jonan/transparent

Transparent GLSurfaceView background

Author: wasabeef

library/src/jp/co/cyberagent/android/gpuimage/GPUImageRenderer.java

@@ -91,8 +91,10 @@ public GPUImageRenderer(final GPUImageFilter filter) {
 
     @Override
     public void onSurfaceCreated(final GL10 unused, final EGLConfig config) {
-        GLES20.glClearColor(0, 0, 0, 1);
-        GLES20.glDisable(GLES20.GL_DEPTH_TEST);
+        GLES20.glDisable(GL10.GL_DITHER);
+        GLES20.glClearColor(0,0,0,0);
+        GLES20.glEnable(GL10.GL_CULL_FACE);
+        GLES20.glEnable(GL10.GL_DEPTH_TEST);
         mFilter.init();
     }
 

library/src/jp/co/cyberagent/android/gpuimage/GPUImageView.java

@@ -20,6 +20,7 @@
 import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.media.MediaScannerConnection;
+import android.graphics.PixelFormat;
 import android.net.Uri;
 import android.opengl.GLES20;
 import android.opengl.GLSurfaceView;
@@ -56,6 +57,9 @@ public GPUImageView(Context context, AttributeSet attrs) {
 
     private void init(Context context, AttributeSet attrs) {
         mGLSurfaceView = new GPUImageGLSurfaceView(context, attrs);
+        mGLSurfaceView.setZOrderOnTop(true);
+        mGLSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
+        mGLSurfaceView.getHolder().setFormat(PixelFormat.TRANSPARENT);
         addView(mGLSurfaceView);
         mGPUImage = new GPUImage(getContext());
         mGPUImage.setGLSurfaceView(mGLSurfaceView);