OpenGL ES运行出错

dchjmichael 2012-02-21 11:17:22

最近学OpenGL ES，想在手机上画个球体。用的是极坐标生成顶点，运行会出错。我已经用native order了，还是报错

02-21 23:12:28.710: E/OpenGLES(3314): Application com.gl.demo (SDK target 8) called a GL11 Pointer method with an indirect Buffer.
02-21 23:12:28.726: W/dalvikvm(3314): threadid=9: thread exiting with uncaught exception (group=0x40018560)
02-21 23:12:28.734: E/AndroidRuntime(3314): FATAL EXCEPTION: GLThread 10
02-21 23:12:28.734: E/AndroidRuntime(3314): java.lang.IllegalArgumentException: Must use a native order direct Buffer
02-21 23:12:28.734: E/AndroidRuntime(3314): at com.google.android.gles_jni.GLImpl.glVertexPointerBounds(Native Method)
02-21 23:12:28.734: E/AndroidRuntime(3314): at com.google.android.gles_jni.GLImpl.glVertexPointer(GLImpl.java:1121)
02-21 23:12:28.734: E/AndroidRuntime(3314): at com.gl.demo.Ball.draw(Ball.java:87)
02-21 23:12:28.734: E/AndroidRuntime(3314): at com.gl.demo.HelloRender.onDrawFrame(HelloRender.java:53)
02-21 23:12:28.734: E/AndroidRuntime(3314): at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1364)
02-21 23:12:28.734: E/AndroidRuntime(3314): at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1119)

下面是Ball类的代码：

public class Ball {



	private FloatBuffer vBuffer;//定点缓存

	

	private ShortBuffer indexBuffer;//定点索引缓存

	

	private int vCount;//顶点数量

	private int iCount;//索引数量

	

	public Ball(int scale){

		ArrayList<Float> verties=new ArrayList<Float>();

		ArrayList<Integer> alIndex=new ArrayList<Integer>();

		int span=18;

		

		for(int v=0;v<=180;v+=span){

			for(int h=0;h<=360;h+=span){

				float r=(float)(scale*Math.sin(Math.toRadians(v)));

				float x=(float)(r*Math.cos(Math.toRadians(h)));

				float y=(float)(scale*Math.cos(Math.toRadians(v)));

				float z=(float)(r*Math.sin(Math.toRadians(h)));

				

				verties.add(x);

				verties.add(y);

				verties.add(z);

			}

		}

		vCount=verties.size()/3;

		

		float[] v=new float[vCount*3];

		for(int i=0;i<v.length;i++){

			v[i]=verties.get(i);

		}

		

		ByteBuffer bb0=ByteBuffer.allocate(verties.size()*4);

		bb0.order(ByteOrder.nativeOrder());

		vBuffer=bb0.asFloatBuffer();

		vBuffer.put(v);

		vBuffer.position(0);

		

		int row=180/span+1;

		int col=360/span+1;

		

		for(int i=0;i<row;i++){

			

			if(i!=(row-1)){

				for(int j=0;j<(col-1);j++){

					int c=i*col+j;

					alIndex.add(c);

					alIndex.add(c+1);

					alIndex.add(c+col);

				}

				

				for(int j=1;j<col;j++){

					int c=i*col+j;

					alIndex.add(c);

					alIndex.add(c+col);

					alIndex.add(c+col-1);

				}

			}

		}

		iCount=alIndex.size();

		

		short[] ind=new short[iCount];

		for(int i=0;i<ind.length;i++){

			ind[i]=alIndex.get(i).shortValue();

		}

		

		ByteBuffer bb1=ByteBuffer.allocate(ind.length*2);

		bb1.order(ByteOrder.nativeOrder());

		indexBuffer=bb1.asShortBuffer();

		indexBuffer.put(ind);

		indexBuffer.position(0);

	}

	

	public void draw(GL10 gl){

		gl.glEnable(GL10.GL_VERTEX_ARRAY);

		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vBuffer);//LogCat提示这里有问题，vBuffer不是native,order

		gl.glDrawElements(GL10.GL_TRIANGLES, iCount, GL10.GL_UNSIGNED_SHORT, indexBuffer);

	}

}