Java OpenGL ES渲染错误

嗯，我在这里遇到了opengl ES的问题（顺便说一句，我刚刚开始了解它）。 这里有一些代码

GLExample.java

glrenderex.java

glleex.java

这就是LOGCAT中的内容

06-13 10:06:34.074: INFO/ActivityManager(71): Displayed com.android.OpGL/.GLExample: +1s391ms
06-13 10:06:34.493: ERROR/OpenGLES(727): Application com.android.OpGL (SDK target 10) called a GL11 Pointer method with an indirect Buffer.
06-13 10:06:34.523: WARN/dalvikvm(727): threadid=9: thread exiting with uncaught exception (group=0x40015560)
06-13 10:06:34.523: ERROR/AndroidRuntime(727): FATAL EXCEPTION: GLThread 10
06-13 10:06:34.523: ERROR/AndroidRuntime(727): java.lang.IllegalArgumentException: Must use a native order direct Buffer
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.google.android.gles_jni.GLImpl.glVertexPointerBounds(Native Method)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.google.android.gles_jni.GLImpl.glVertexPointer(GLImpl.java:1121)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.android.OpGL.GLTriangleEx.draw(GLTriangleEx.java:42)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.android.OpGL.GLRendererEx.onDrawFrame(GLRendererEx.java:31)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1363)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1118)
06-13 10:06:34.553: WARN/ActivityManager(71):   Force finishing activity com.android.OpGL/.GLExample

---

正如您看到的，它说错误在这里

gl.glvertexponter（2，GL10.gl_FLOAT，0，vertBuff）但我不明白哪里出了问题
问题很清楚：

... called a GL11 Pointer method with an indirect Buffer.

vertBuff
缓冲区需要是
direct
，这样它就不会在内存中移动。
您需要使用
ByteBuffer
类中的方法

然后获取该方法返回的
ByteBuffer
对象，并将其转换为类似于中的FloatBuffer

祝你好运

    package com.android.OpGL;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;

import javax.microedition.khronos.opengles.GL10;

public class GLTriangleEx {

    private float vertices[]= {
        0f, 1f, //(0,1) point
        1f, -1f,//(1,-1)
        -1f,-1f//(-1,-1)
    };

    private FloatBuffer vertBuff;

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

    private ShortBuffer pBuff;

    public GLTriangleEx(){

        ByteBuffer bBuff = ByteBuffer.allocate(vertices.length *4);
        bBuff.order(ByteOrder.nativeOrder());
        vertBuff = bBuff.asFloatBuffer();
        vertBuff.put(vertices);
        vertBuff.position(0);

        ByteBuffer pbBuff = ByteBuffer.allocateDirect(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);
    }
}

06-13 10:06:34.074: INFO/ActivityManager(71): Displayed com.android.OpGL/.GLExample: +1s391ms
06-13 10:06:34.493: ERROR/OpenGLES(727): Application com.android.OpGL (SDK target 10) called a GL11 Pointer method with an indirect Buffer.
06-13 10:06:34.523: WARN/dalvikvm(727): threadid=9: thread exiting with uncaught exception (group=0x40015560)
06-13 10:06:34.523: ERROR/AndroidRuntime(727): FATAL EXCEPTION: GLThread 10
06-13 10:06:34.523: ERROR/AndroidRuntime(727): java.lang.IllegalArgumentException: Must use a native order direct Buffer
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.google.android.gles_jni.GLImpl.glVertexPointerBounds(Native Method)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.google.android.gles_jni.GLImpl.glVertexPointer(GLImpl.java:1121)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.android.OpGL.GLTriangleEx.draw(GLTriangleEx.java:42)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at com.android.OpGL.GLRendererEx.onDrawFrame(GLRendererEx.java:31)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1363)
06-13 10:06:34.523: ERROR/AndroidRuntime(727):     at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1118)
06-13 10:06:34.553: WARN/ActivityManager(71):   Force finishing activity com.android.OpGL/.GLExample

... called a GL11 Pointer method with an indirect Buffer.