android中的三角形opengl

Question

我是opengl的新手所以我正在使用android開發者的指南。我已經完成了他們所說的所有事情，但它顯示了一個強制關閉的錯誤。

在我的日志cat文件中，它顯示以下錯誤

03-30 20:13:14.342: E/AndroidRuntime(317): FATAL EXCEPTION: GLThread 8
03-30 20:13:14.342: E/AndroidRuntime(317): java.lang.IllegalArgumentException: No configs match configSpec
03-30 20:13:14.342: E/AndroidRuntime(317):  at android.opengl.GLSurfaceView$BaseConfigChooser.chooseConfig(GLSurfaceView.java:760)
03-30 20:13:14.342: E/AndroidRuntime(317):  at android.opengl.GLSurfaceView$EglHelper.start(GLSurfaceView.java:916)
03-30 20:13:14.342: E/AndroidRuntime(317):  at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1246)
03-30 20:13:14.342: E/AndroidRuntime(317):  at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)

我的清單文件如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.opengl"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />
    <uses-feature android:glEsVersion="0x00020000" android:required="true" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".HelloOpenGLES20"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我的活動課程如下

import android.app.Activity;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

public class HelloOpenGLES20 extends Activity {

    private GLSurfaceView mGLView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Create a GLSurfaceView instance and set it
        // as the ContentView for this Activity
        mGLView = new HelloOpenGLES20SurfaceView(this);
        setContentView(mGLView);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // The following call pauses the rendering thread.
        // If your OpenGL application is memory intensive,
        // you should consider de-allocating objects that
        // consume significant memory here.
        mGLView.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        // The following call resumes a paused rendering thread.
        // If you de-allocated graphic objects for onPause()
        // this is a good place to re-allocate them.
        mGLView.onResume();
    }
}

class HelloOpenGLES20SurfaceView extends GLSurfaceView {

    public HelloOpenGLES20SurfaceView(Context context){
        super(context);

        // Create an OpenGL ES 2.0 context.
        setEGLContextClientVersion(2);
        // Set the Renderer for drawing on the GLSurfaceView
        setRenderer(new HelloOpenGLES20Renderer());
    }
}

我的表面類如下

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

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLES20;
import android.opengl.GLSurfaceView;

public class HelloOpenGLES20Renderer implements GLSurfaceView.Renderer {

    private FloatBuffer triangleVB;

     private final String vertexShaderCode = 
                "attribute vec4 vPosition; \n" +
                "void main(){              \n" +
                " gl_Position = vPosition; \n" +
                "}                         \n";

            private final String fragmentShaderCode = 
                "precision mediump float;  \n" +
                "void main(){              \n" +
                " gl_FragColor = vec4 (0.63671875, 0.76953125, 0.22265625, 1.0); \n" +
                "}                         \n";

            private int mProgram;
            private int maPositionHandle;

    public void onSurfaceCreated(GL10 unused, EGLConfig config) {

        // Set the background frame color
        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);

     // initialize the triangle vertex array
        initShapes();

        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
        int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);

        mProgram = GLES20.glCreateProgram();             // create empty OpenGL Program
        GLES20.glAttachShader(mProgram, vertexShader);   // add the vertex shader to program
        GLES20.glAttachShader(mProgram, fragmentShader); // add the fragment shader to program
        GLES20.glLinkProgram(mProgram);                  // creates OpenGL program executables

        // get handle to the vertex shader's vPosition member
        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
    }

    public void onDrawFrame(GL10 unused) {

        // Redraw background color
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        // Add program to OpenGL environment
        GLES20.glUseProgram(mProgram);

        // Prepare the triangle data
        GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 12, triangleVB);
        GLES20.glEnableVertexAttribArray(maPositionHandle);

        // Draw the triangle
        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
    }

    public void onSurfaceChanged(GL10 unused, int width, int height) {
        GLES20.glViewport(0, 0, width, height);
    }

    private void initShapes(){

        float triangleCoords[] = {
            // X, Y, Z
            -0.5f, -0.25f, 0,
             0.5f, -0.25f, 0,
             0.0f,  0.559016994f, 0
        }; 

        // initialize vertex Buffer for triangle  
        ByteBuffer vbb = ByteBuffer.allocateDirect(
                // (# of coordinate values * 4 bytes per float)
                triangleCoords.length * 4); 
        vbb.order(ByteOrder.nativeOrder());// use the device hardware's native byte order
        triangleVB = vbb.asFloatBuffer();  // create a floating point buffer from the ByteBuffer
        triangleVB.put(triangleCoords);    // add the coordinates to the FloatBuffer
        triangleVB.position(0);            // set the buffer to read the first coordinate

    }

    private int loadShader(int type, String shaderCode){

        // create a vertex shader type (GLES20.GL_VERTEX_SHADER)
        // or a fragment shader type (GLES20.GL_FRAGMENT_SHADER)
        int shader = GLES20.glCreateShader(type); 

        // add the source code to the shader and compile it
        GLES20.glShaderSource(shader, shaderCode);
        GLES20.glCompileShader(shader);

        return shader;
    }

}

Answer 1

您收到此錯誤的原因是您正在測試的設備不支持OpenGL ES 2.0。 您可能正在模擬器上測試它，它不支持該版本的OpenGL。

只是嘗試在真實設備上測試它，你會發現它可以正常工作。

Answer 2

出現此問題的原因是任何Android虛擬設備都不支持3d圖像。如果任何人想要運行3d圖像，那么他或她應該使用任何物理設備。