Android Opengl ES：GLUtils.glTexImage2D导致GL_INVALID_ENUM

Question

我想使用GLSurfaceView在Android 2.2上呈现简单的纹理四元组。我正在加载一个BMP图像（128x128）与BitmapFactory.decodeResource() - 这似乎工作。但是，无论何时我尝试使用GLUtils.glTexImage2D将此位图放入OpenGL纹理中，我都会收到OpenGL错误：glGetError()将返回1280,GL_INVALID_ENUM。我究竟做错了什么？ 这是我的渲染代码：

public class MyRenderer implements GLSurfaceView.Renderer { 
    Context context; 
    int texId; 

    public MyRenderer(Context c) { 
     this.context = c; 
    } 

    @Override 
    public void onSurfaceCreated(GL10 gl, EGLConfig config) { 
     gl.glEnable(GL10.GL_TEXTURE_2D); 
     this.texId = loadTexture(gl);  
    } 

    int loadTexture(GL10 gl) {  
     int[] tmp = new int[1]; 
     gl.glGenTextures(1, tmp, 0); 
     int id = tmp[0]; 

     Bitmap bmp = BitmapFactory.decodeResource(this.context.getResources(), R.drawable.myimage); 
     gl.glGetError(); 
     GLUtils.texImage2D(id, 0, bmp, 0); 
     int err = gl.glGetError(); 
     if (err != 0) { 
      // err == 1280, prints "invalid enum": 
      System.err.println(GLU.gluErrorString(err)); 
     } 

     return id; 
    } 

    @Override 
    public void onSurfaceChanged(GL10 gl, int width, int height) {  
     gl.glViewport(0, 0, width, height); 
     gl.glMatrixMode(GL10.GL_PROJECTION); 
     gl.glLoadIdentity(); 
     GLU.gluOrtho2D(gl, 0, width, height, 0); 
     gl.glMatrixMode(GL10.GL_MODELVIEW); 
     gl.glLoadIdentity();    
    } 

    @Override 
    public void onDrawFrame(GL10 gl) { 
     // ... 
    } 
} 

Answer 1

它可能应该是这样的：

gl.glBindTexture(GL10.GL_TEXTURE_2D, id); 
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp, 0);