如何用GlSurfaceView创建位图？

Question

在Cocos2d里，我想用Glsurfaceview截取图像，但是返回的却是透明图像，代码如下：

GlsurfaceView glv=CCDirector.sharedDirector().getOpenGLView();
glv.setDrawingCacheEnabled(true);
Bitmap bitmap=glv.getDrawingCache();

原问题：[Cocos2d]How to Create bitmap from GlSurfaceView

Answer 1

答案
Peter：解决方案如下。

if (MainImageProcessingActivity.capture) {
        int width = MainImageProcessingActivity.w;
        int height = MainImageProcessingActivity.h;
        int screenshotSize = width * height;
        ByteBuffer bb = ByteBuffer.allocateDirect(screenshotSize * 4);
        bb.order(ByteOrder.nativeOrder());
        gl.glReadPixels(0, 0, width, height, GL10.GL_RGBA,
                GL10.GL_UNSIGNED_BYTE, bb);
        int pixelsBuffer[] = new int[screenshotSize];
        bb.asIntBuffer().get(pixelsBuffer);
        bb = null;
        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.RGB_565);
        bitmap.setPixels(pixelsBuffer, screenshotSize - width, -width, 0,
                0, width, height);
        pixelsBuffer = null;

        short sBuffer[] = new short[screenshotSize];
        ShortBuffer sb = ShortBuffer.wrap(sBuffer);
        bitmap.copyPixelsToBuffer(sb);

        // Making created bitmap (from OpenGL points) compatible with
        // Android bitmap
        for (int i = 0; i < screenshotSize; ++i) {
            short v = sBuffer[i];
            sBuffer[i] = (short) (((v & 0x1f) << 11) | (v & 0x7e0) | ((v & 0xf800) >> 11));
        }
        sb.rewind();
        bitmap.copyPixelsFromBuffer(sb);
        MainImageProcessingActivity.captureBmp = bitmap.copy(Bitmap.Config.ARGB_8888,false);
        MainImageProcessingActivity.capture=false;
    }

DroidBot（提问者）：感谢Peter，我把这个代码用于我的渲染器和onDraw方法里，非常好用！