2d在Android模擬器上打開es上的三角形8

嘿我試圖在opengl上繪製一個三角形。我只是按照教程來做到這一點。儘管一切看起來都很好，但它不起作用。每次運行我的代碼時，它都會將我發回主菜單。2d在Android模擬器上打開es上的三角形8

調試後，我注意到，在該行

gl.glDrawElements(GL10.GL_TRIANGLES, pIndex.length, GL10.GL_UNSIGNED_SHORT, pBuff);

這是我GLExample.java類我的應用程序stucks

public class GLExample extends Activity { 
    GLSurfaceView ourSurface; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     ourSurface = new GLSurfaceView(this); 
     ourSurface.setRenderer(new GLRendererEx()); 
     setContentView(ourSurface); 
    } 

    @Override 
    protected void onPause() { 

     super.onPause(); 
     ourSurface.onPause(); 
    } 

    @Override 
    protected void onResume() { 

     super.onResume(); 
     ourSurface.onResume(); 
    } 
}

這是我GLTriangleEX類

public class GLTriangleEx { 

    private float vertices[] = { 
      0f, 1f, // p0 
      1f, -1f, // p1 
      -1f, -1f // p2 

    }; 

    private FloatBuffer vertBuff; 

    private short[] pIndex = { 0, 1, 2 }; 

    private ShortBuffer pBuff; 

    public GLTriangleEx() { 

     // her bir float için 4 byte gerektiğinden length * 4 oldu 
     ByteBuffer bBuff = ByteBuffer.allocateDirect(vertices.length * 4); 
     bBuff.order(ByteOrder.nativeOrder()); 
     vertBuff = bBuff.asFloatBuffer(); 
     vertBuff.put(vertices); 
     vertBuff.position(0); 

     ByteBuffer pbBuff = ByteBuffer.allocate(pIndex.length * 2); 
     pbBuff.order(ByteOrder.nativeOrder()); 
     pBuff = pbBuff.asShortBuffer(); 
     pBuff.put(pIndex); 
     pBuff.position(0); 

    } 

    public void Draw(GL10 gl) { 
     gl.glFrontFace(GL10.GL_CW); 
     gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); 
     gl.glVertexPointer(2, GL10.GL_FLOAT, 0, vertBuff); 
     gl.glDrawElements(GL10.GL_TRIANGLES, pIndex.length, 
       GL10.GL_UNSIGNED_SHORT, pBuff); 
     gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); 
    } 
}

這是我的GLRendererEx.java類

public class GLRendererEx implements Renderer { 

    private GLTriangleEx tri; 

    public GLRendererEx() { 
     tri = new GLTriangleEx(); 

    } 

    @Override 
    public void onSurfaceCreated(GL10 gl, EGLConfig eglConfig) { 
     gl.glDisable(GL10.GL_DITHER); 
     gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST); 
     gl.glClearColor(.1f, 0f, .9f, 1f);// set background color 
     gl.glClearDepthf(1f); 
    } 

    @Override 
    public void onDrawFrame(GL10 gl) { 

     gl.glDisable(GL10.GL_DITHER); 
     gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); 

     gl.glMatrixMode(GL10.GL_MODELVIEW); 
     gl.glLoadIdentity(); 
     GLU.gluLookAt(gl, 0, 0, -5, 0, 0, 0, 0, 2, 0); 

     tri.Draw(gl); 

    } 

    @Override 
    public void onSurfaceChanged(GL10 gl, int width, int height) { 
     gl.glViewport(0, 0, width, height); 
     float ratio = (float) width/height; 
     gl.glMatrixMode(GL10.GL_PROJECTION); 
     gl.glLoadIdentity(); 
     gl.glFrustumf(-ratio, ratio, -1, 1, 1, 25); 

    } 

}

和我的logcat

02-08 12:11:01.244: I/ActivityManager(58): Starting activity: Intent { cmp=com.android/.GLExample } 
02-08 12:11:01.305: D/dalvikvm(328): GC_EXTERNAL_ALLOC freed 1143 objects/82584 bytes in 39ms 
02-08 12:11:01.393: D/libEGL(328): egl.cfg not found, using default config 
02-08 12:11:01.393: D/libEGL(328): loaded /system/lib/egl/libGLES_android.so 
02-08 12:11:01.534: I/DEBUG(30): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** 
02-08 12:11:01.534: I/DEBUG(30): Build fingerprint: 'generic/google_sdk/generic/:2.2/FRF91/43546:eng/test-keys' 
02-08 12:11:01.534: I/DEBUG(30): pid: 328, tid: 334 >>> com.android <<< 
02-08 12:11:01.534: I/DEBUG(30): signal 11 (SIGSEGV), fault addr 00000000 
02-08 12:11:01.534: I/DEBUG(30): r0 00001403 r1 00000003 r2 00000000 r3 00001403 
02-08 12:11:01.534: I/DEBUG(30): r4 00239480 r5 00000000 r6 00000003 r7 00239480 
02-08 12:11:01.534: I/DEBUG(30): r8 00000000 r9 00000000 10 00000000 fp 0012fbb8 
02-08 12:11:01.534: I/DEBUG(30): ip 00000000 sp 45f03d20 lr ac40604c pc ac40503c cpsr 60000010 
02-08 12:11:01.594: I/DEBUG(30):   #00 pc 0000503c /system/lib/egl/libGLES_android.so 
02-08 12:11:01.594: I/DEBUG(30):   #01 pc 00006048 /system/lib/egl/libGLES_android.so 
02-08 12:11:01.594: I/DEBUG(30):   #02 pc 00020618 /system/lib/libandroid_runtime.so 
02-08 12:11:01.594: I/DEBUG(30):   #03 pc 00013974 /system/lib/libdvm.so 
02-08 12:11:01.594: I/DEBUG(30): code around pc: 
02-08 12:11:01.594: I/DEBUG(30): ac40501c e5900548 e3a05b05 e2853003 e1500003 
02-08 12:11:01.604: I/DEBUG(30): ac40502c e2419003 1a000023 e1a05002 e3a0a000 
02-08 12:11:01.604: I/DEBUG(30): ac40503c e1d510b0 e1a00004 ebffff6e e1d510b2 
02-08 12:11:01.604: I/DEBUG(30): ac40504c e1a07000 e1a00004 ebffff6a e1d510b4 
02-08 12:11:01.604: I/DEBUG(30): ac40505c e1a06000 e1a00004 ebffff66 e5971020 
02-08 12:11:01.604: I/DEBUG(30): code around lr: 
02-08 12:11:01.604: I/DEBUG(30): ac40602c e59fe0ac e1a00007 e1a01006 e084400e 
02-08 12:11:01.604: I/DEBUG(30): ac40603c e0845105 e1a02008 e1a0e00f e595f2c0 
02-08 12:11:01.604: I/DEBUG(30): ac40604c e8bd81f0 e8bd81f0 e597098c e3a01b01 
02-08 12:11:01.604: I/DEBUG(30): ac40605c e281c008 e150000c 1affffe1 eafffff7 
02-08 12:11:01.604: I/DEBUG(30): ac40606c e3a01c05 e1a00007 e2811001 e8bd41f0 
02-08 12:11:01.604: I/DEBUG(30): stack: 
02-08 12:11:01.604: I/DEBUG(30):  45f03ce0 45f03d34 
02-08 12:11:01.604: I/DEBUG(30):  45f03ce4 80834ab3 /system/lib/libdvm.so 
02-08 12:11:01.604: I/DEBUG(30):  45f03ce8 8086deac /system/lib/libdvm.so 
02-08 12:11:01.604: I/DEBUG(30):  45f03cec 80846dad /system/lib/libdvm.so 
02-08 12:11:01.614: I/DEBUG(30):  45f03cf0 00000001 
02-08 12:11:01.614: I/DEBUG(30):  45f03cf4 0012fbb8 [heap] 
02-08 12:11:01.614: I/DEBUG(30):  45f03cf8 43e460f8 /dev/ashmem/mspace/dalvik-heap/2 (deleted) 
02-08 12:11:01.614: I/DEBUG(30):  45f03cfc 00239480 [heap] 
02-08 12:11:01.614: I/DEBUG(30):  45f03d00 ac41b858 /system/lib/egl/libGLES_android.so 
02-08 12:11:01.614: I/DEBUG(30):  45f03d04 00001100 
02-08 12:11:01.614: I/DEBUG(30):  45f03d08 00000077 
02-08 12:11:01.614: I/DEBUG(30):  45f03d0c ac908e2c /system/lib/libpixelflinger.so 
02-08 12:11:01.614: I/DEBUG(30):  45f03d10 428a0ee8 
02-08 12:11:01.614: I/DEBUG(30):  45f03d14 00000000 
02-08 12:11:01.614: I/DEBUG(30):  45f03d18 df002777 
02-08 12:11:01.614: I/DEBUG(30):  45f03d1c e3a070ad 
02-08 12:11:01.614: I/DEBUG(30): #00 45f03d20 ac41b008 /system/lib/egl/libGLES_android.so 
02-08 12:11:01.614: I/DEBUG(30):  45f03d24 ac41b018 /system/lib/egl/libGLES_android.so 
02-08 12:11:01.614: I/DEBUG(30):  45f03d28 00000003 
02-08 12:11:01.614: I/DEBUG(30):  45f03d2c 00239480 [heap] 
02-08 12:11:01.614: I/DEBUG(30):  45f03d30 00000000 
02-08 12:11:01.614: I/DEBUG(30):  45f03d34 428a0ee8 
02-08 12:11:01.614: I/DEBUG(30):  45f03d38 428a0ed0 
02-08 12:11:01.614: I/DEBUG(30):  45f03d3c ac40604c /system/lib/egl/libGLES_android.so 
02-08 12:11:01.614: I/DEBUG(30): #01 45f03d40 00118d78 [heap] 
02-08 12:11:01.624: I/DEBUG(30):  45f03d44 00000003 
02-08 12:11:01.624: I/DEBUG(30):  45f03d48 00000000 
02-08 12:11:01.624: I/DEBUG(30):  45f03d4c 00000004 
02-08 12:11:01.624: I/DEBUG(30):  45f03d50 45f03d80 
02-08 12:11:01.624: I/DEBUG(30):  45f03d54 ad32061c /system/lib/libandroid_runtime.so 
02-08 12:11:02.084: I/BootReceiver(58): Copying /data/tombstones/tombstone_09 to DropBox (SYSTEM_TOMBSTONE) 
02-08 12:11:02.094: D/Zygote(32): Process 328 terminated by signal (11) 
02-08 12:11:02.174: D/dalvikvm(58): GC_FOR_MALLOC freed 2585 objects/653024 bytes in 89ms 
02-08 12:11:02.184: I/WindowManager(58): WIN DEATH: Window{4400b600 SurfaceView paused=false} 
02-08 12:11:02.184: I/WindowManager(58): WIN DEATH: Window{4400b9c0 com.android/com.android.GLExample paused=false} 
02-08 12:11:02.184: I/WindowManager(58): WIN DEATH: Window{43f5e388 com.android/com.android.Menu paused=false} 
02-08 12:11:02.184: I/ActivityManager(58): Process com.android (pid 328) has died. 
02-08 12:11:02.203: I/ActivityManager(58): Start proc com.android for activity com.android/.Menu: pid=335 uid=10040 gids={3003, 1015} 
02-08 12:11:02.343: I/UsageStats(58): Unexpected resume of com.android while already resumed in com.android 
02-08 12:11:02.354: I/ActivityManager(58): Displayed activity com.android/.Menu: 168 ms (total 1103 ms) 
02-08 12:11:02.564: W/InputManagerService(58): Got RemoteException sending setActive(false) notification to pid 328 uid 10040

來源

2013-02-08 Anar Bayramov

它提供了「信號11」，這是一個分段錯誤。所以，程序試圖訪問一個內存位置，要麼你沒有權限，要麼是null。

您的代碼停留在glDrawElements（），因爲你是PBUFF不正確分配。

替換此：

ByteBuffer pbBuff = ByteBuffer.allocate(pIndex.length * 2);

有了這個：

ByteBuffer pbBuff = ByteBuffer.allocateDirect(pIndex.length * 2);

，它應該工作的罰款。

來源

2013-02-08 23:10:23

這就是解決我的問題謝謝！ – 2013-02-08 23:24:22

[閱讀它應該不會崩潰]（http://stackoverflow.com/questions/5670862/bytebuffer-allocate-vs-bytebuffer-allocatedirect）... – 2013-02-09 02:53:26

2d在Android模擬器上打開es上的三角形8

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