Question

我上课的是白线：

public class Line {

    //private FloatBuffer vertexBuffer;
    private FloatBuffer frameVertices;

    ByteBuffer diagIndices;


    float[] vertices = {
            -0.5f, -0.5f, 0.0f,
            -0.5f, 0.5f,  0.0f
    };

    public Line(GL10 gl) {
        // a float has 4 bytes so we allocate for each coordinate 4 bytes
        ByteBuffer vertexByteBuffer = ByteBuffer.allocateDirect(vertices.length * 4);
        vertexByteBuffer.order(ByteOrder.nativeOrder());

        // allocates the memory from the byte buffer
        frameVertices = vertexByteBuffer.asFloatBuffer();

        // fill the vertexBuffer with the vertices
        frameVertices.put(vertices);

        // set the cursor position to the beginning of the buffer
        frameVertices.position(0);

    }


    /** The draw method for the triangle with the GL context */
    public void draw(GL10 gl) {

        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glVertexPointer(2, GL10.GL_FLOAT, 0, frameVertices);
        gl.glColor4f(1.0f, 1.0f, 1.0f, 1f);

        gl.glDrawArrays(GL10.GL_LINE_LOOP , 0, vertices.length / 3);
        gl.glLineWidth(5.0f);

        gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
    }
}

工作正常。问题是：当我添加BG图像时，我看不到该行

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        glView = new GLSurfaceView(this);           // Allocate a GLSurfaceView
        //glView.setEGLContextClientVersion(1);
        glView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
        glView.setRenderer(new mainRenderer(this)); // Use a custom renderer

        glView.setBackgroundResource(R.drawable.bg_day); // <- BG overlaps my line
        glView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
        glView.getHolder().setFormat(PixelFormat.TRANSLUCENT);  

        this.setContentView(glView);   // This activity sets to GLSurfaceView
     }

如何摆脱它？

我确信它应该是简单的。

谢谢，

Answer 1

您需要将GLSurfaceView放在活动窗口的顶部。见setZOrderOnTop。应该像

一样简单

    glView = new GLSurfaceView(this);           // Allocate a GLSurfaceView
    glView.setZOrderOnTop(true);

控制表面视图的表面是否位于其顶部窗口。通常它被放置在窗口后面，以允许它（为大多数情况下）似乎与层次结构中的视图合成。通过设置它，你可以将它放在窗口上方。这意味着这个SurfaceView所在窗口的内容都不是在其表面上可见。

相关问题包括： Android GLSurfaceView with drawable background

在背景图像上绘制线条，OpenGL Android

1 个答案: