如何在 OpenGL ES Android 中绘制网格线？

public class Grid {
    private FloatBuffer vertexBuffer;
    private int program;
    private int positionHandle;
    private int colorHandle;

    public Grid(int size, float scale) {
        // 准备顶点数据
        float[] vertices = new float[size * size * 2];
        for (int i = 0; i< size; i++) {
            for (int j = 0; j< size; j++) {
                vertices[(i * size + j) * 2] = j * scale;
                vertices[(i * size + j) * 2 + 1] = i * scale;
            }
        }

        // 创建顶点缓冲区
        vertexBuffer = ByteBuffer.allocateDirect(vertices.length * 4)
                .order(ByteOrder.nativeOrder())
                .asFloatBuffer()
                .put(vertices);
        vertexBuffer.position(0);

        // 创建着色器程序
        int vertexShader = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
        int fragmentShader = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);

        GLES20.glShaderSource(vertexShader, vertexShaderCode);
        GLES20.glShaderSource(fragmentShader, fragmentShaderCode);

        GLES20.glCompileShader(vertexShader);
        GLES20.glCompileShader(fragmentShader);

        program = GLES20.glCreateProgram();
        GLES20.glAttachShader(program, vertexShader);
        GLES20.glAttachShader(program, fragmentShader);
        GLES20.glLinkProgram(program);

        // 配置顶点属性
        positionHandle = GLES20.glGetAttribLocation(program, "a_position");
        colorHandle = GLES20.glGetUniformLocation(program, "u_color");
    }

    public void draw(float[] mvpMatrix, float[] color) {
        // 使用着色器程序
        GLES20.glUseProgram(program);

        // 配置顶点属性
        GLES20.glEnableVertexAttribArray(positionHandle);
        GLES20.glVertexAttribPointer(positionHandle, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);

        // 设置颜色
        GLES20.glUniform4fv(colorHandle, 1, color, 0);

        // 绘制网格线
        GLES20.glDrawArrays(GLES20.GL_LINES, 0, vertexBuffer.capacity() / 2);

        // 禁用顶点属性
        GLES20.glDisableVertexAttribArray(positionHandle);
    }

    public void release() {
        // 释放资源
        GLES20.glDeleteProgram(program);
        vertexBuffer = null;
    }
}