[移动开发]Android opengles fbo缓存测试代码

//从当前fbo缓存拷贝图像至bitmap
private int[] copyDataToBitmap(float viewPortHeight,Rect rect) {
    int rectWidth = rect.width();
    int rectHeight = rect.height();

    IntBuffer intBuffer = IntBuffer.allocate(rectWidth * rectHeight);
    GLES30.glReadPixels((int) rect.left, (int) (viewPortHeight - rect.bottom), rectWidth, rectHeight,
            GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, intBuffer);

    int[] array = intBuffer.array();
    IntBuffer invertBuffer = IntBuffer.allocate(array.length);
    for (int i = 0; i < rectHeight; i++) {
        invertBuffer.put(array,(rectHeight-i-1) * rectWidth,rectWidth);
    }
    return invertBuffer.array();
}
//调试用
private void debug_cache(){
    Bitmap bitmap_main = Bitmap.createBitmap((int)visibleWidth,(int)visibleHeight, Bitmap.Config.ARGB_8888);
    bitmap_main.eraseColor(Color.RED);
    int[] bitmapDataTest = copyDataToBitmap((int)visibleHeight,new Rect(0,0,(int)visibleWidth,(int)visibleHeight));
    bitmap_main.setPixels(bitmapDataTest, 0, (int)visibleWidth, 0,  0,  (int)visibleWidth,(int)visibleHeight);
    //输出到图片
long timeNow=System.nanoTime();
saveBitmapAsPng(bitmap_main,""+timeNow+"drawPredictPoint"+"_start.png");

}

public static void mkdir(String  dir) {
    File f = new File(dir);
    if (!f.exists())
        f.mkdirs();
}
public static void saveBitmapAsPng(Bitmap bmp, String name) {
    try {
        String dir="/storage/emulated/0/Android/data/com.sunia.PenEngine/files/Documents/log_img/";
        mkdir(dir);
        File f = new File(dir+name);
        FileOutputStream out = new FileOutputStream(f);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, out);
        out.flush();
        out.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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