Question

我在一些手机上发现我的glSurfaceView中的一些纹理在一些谷歌搜索后没有加载（只显示白色），我设置setDebugFlags（DEBUG_CHECK_ERROR）以获得下面列出的以下错误日志。 MenuButton.java中的第40行是：

gl.glGenTextures(1, textures, 0);

其中textures是我的纹理指针，声明为：

private int[] textures = new int[1];

我很难过，因为我只看到Droid Pro和其他几部手机的这个问题，我不知道gl.glGenTextures会有一个无效的值。任何想法都会有用。

编辑：菜单按钮的代码发布在下面。

12-06 17:46:31.720: E/AndroidRuntime(2984): android.opengl.GLException: invalid value
12-06 17:46:31.720: E/AndroidRuntime(2984): at android.opengl.GLErrorWrapper.glGenTextures(GLErrorWrapper.java:350)
12-06 17:46:31.720: E/AndroidRuntime(2984): at com.huskybuspurchased.MenuButton.<init>(MenuButton.java:40)
12-06 17:46:31.720: E/AndroidRuntime(2984): at com.huskybuspurchased.CampusMap.onSurfaceCreated(CampusMap.java:112)
12-06 17:46:31.720: E/AndroidRuntime(2984): at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1348)
12-06 17:46:31.720: E/AndroidRuntime(2984): at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1118)
12-06 17:46:31.728: I/hb(2984): rendering thread paused.

问题的照片： enter image description here

package com.huskybus;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import javax.microedition.khronos.opengles.GL10;
import android.graphics.Bitmap;
import android.opengl.GLUtils;
import android.util.Log;
import android.view.MotionEvent;

public class MenuButton {
//Our texture.
private float texture[] = {
        //Mapping coordinates for the vertices
        0.0f, 1.0f,
        1.0f, 1.0f,
        0.0f, 0.0f,
        1.0f, 0.0f, 
};
// The order we like to connect them.
private byte indices[] = {0,1,3,2};
// Our vertex buffer.
private FloatBuffer vertexBuffer;
// Our index buffer.
private ByteBuffer indexBuffer;
//texture buffer.
private FloatBuffer textureBuffer;
//Our texture pointer.
private int[] textures = new int[1];
private int width;
private int height;
private float rotation;
public MenuButton(Bitmap graphic,int _rotation,GL10 gl, int _width, int _height) {
    rotation=_rotation;
    width=_width;
    height=_height;

        //Generate one texture pointer...
        gl.glGenTextures(1, textures, 0);
        //...and bind it to our array
        gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
        gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
        //Use the Android GLUtils to specify a two-dimensional texture image from our bitmap
        GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, graphic, 0);
        graphic.recycle();

    float vertices[] = {
            0, -height, 0.0f, //LB
            width, -height, 0.0f,  //RB
            0, 0, 0.0f,  //LT
            width, 0, 0.0f,   //RT
        };

    ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
    byteBuf.order(ByteOrder.nativeOrder());
    vertexBuffer = byteBuf.asFloatBuffer();
    vertexBuffer.put(vertices);
    vertexBuffer.position(0);

    //
    byteBuf = ByteBuffer.allocateDirect(texture.length * 4);
    byteBuf.order(ByteOrder.nativeOrder());
    textureBuffer = byteBuf.asFloatBuffer();
    textureBuffer.put(texture);
    textureBuffer.position(0);
    //
    indexBuffer = ByteBuffer.allocateDirect(indices.length);
    indexBuffer.put(indices);
    indexBuffer.position(0);        
}

/**
 * This function draws our square on screen.
 * @param gl
 */
public void draw(GL10 gl) {
    //Bind our only previously generated texture in this case
    gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
    //Point to our buffers
    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
    gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
    //Set the face rotation
    gl.glFrontFace(GL10.GL_CCW);
    //Enable the vertex and texture state
    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
    gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);
    gl.glRotatef(rotation, 0, 0, 1);
    //Draw the vertices as triangles, based on the Index Buffer information
    gl.glDrawElements(GL10.GL_TRIANGLE_FAN, indices.length, GL10.GL_UNSIGNED_BYTE, indexBuffer);
    gl.glRotatef(360-rotation, 0, 0, 1);

    // Disable the vertices buffer.
    gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
    //Disable the texture buffer.
    gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
    // Disable face culling.
    gl.glEnable(GL10.GL_CULL_FACE);
}
public boolean amIHit(float[] matrixValues,MotionEvent event) {
    if  (((event.getX())>(0)&&((event.getX()))<5+width)&&((event.getY())>0)&&(event.getY()<width))  {   
        Log.e("sys","hit menu button.");
        return true;
    }
    return false;       
}

}

Answer 1

glSurfaceView选择要渲染的曲面，不同的Android设备支持不同的曲面，不幸的是，我们没有一个所有人都支持的公共子集。因此选择起来很棘手默认情况下，glSurfaceView会尝试查找接近16位深度缓冲区的曲面所以你需要使用一个图像作为你的纹理目的，它具有16位深度缓冲或可能24位。较高位深度的图像可能会导致某些设备出现问题。!!

Answer 2

您不一定需要调用glGenTextures。您可以为您的纹理提供您想要的任何数值 - glGenTextures只是为了获得尚未使用的纹理编号的便利。

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