Android - 使用openGL ES繪製2D，然後2D。

Question

如何在openGL ES中繪製一些3d素材後繪製HUD（文本或位圖）？

我嘗試這樣做：

private void switchTo2D(GL10 gl){ 
    gl.glDisable(GL10.GL_DEPTH_TEST); 
    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glPushMatrix(); 
    gl.glLoadIdentity(); 

    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glLoadIdentity(); 
    GLU.gluOrtho2D(gl, 0, getViewportWidth(), 0, getViewportHeight()); 

    gl.glMatrixMode(GL10.GL_MODELVIEW); 
    gl.glLoadIdentity(); 
} 

有人知道如何從視角切換到鄰不破壞現場？

Answer 1

我找到了解決辦法，但我忘了將它張貼:)對不起

package at.bartinger.opengl; 

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

import android.content.Context; 
import android.opengl.GLSurfaceView; 
import android.opengl.GLU; 
import android.util.AttributeSet; 

public class GLGameView extends GLSurfaceView implements GLSurfaceView.Renderer{ 


public GLGameView(Context context) { 
    super(context); 
    setRenderer(this); 
} 

public GLGameView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    // TODO Auto-generated constructor stub 
} 

@Override 
public void onSurfaceCreated(GL10 gl, EGLConfig config) { 
    init(gl); 
} 

@Override 
public void onDrawFrame(GL10 gl) { 

    //Standard 
    gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); 
    gl.glViewport(0, 0, getWidth(), getHeight()); 

    gl.glDisable(GL10.GL_DITHER); 
    gl.glEnable(GL10.GL_DEPTH_TEST); 
    gl.glEnable(GL10.GL_CULL_FACE); 

    //Set 3D 
    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glLoadIdentity(); 
    gluPerspective(gl);  



    draw3D(gl); 


    gl.glDisable(GL10.GL_CULL_FACE); 
    gl.glDisable(GL10.GL_DEPTH_TEST); 

    //Set 2D 
    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glLoadIdentity(); 
    gluOrtho2D(gl); 
    gl.glMatrixMode(GL10.GL_MODELVIEW); 
    gl.glLoadIdentity(); 


    draw2D(gl); 

} 

@Override 
public void onSurfaceChanged(GL10 gl, int width, int height) { 

} 

public void init(GL10 gl){} 

public void draw2D(GL10 gl){}; 

public void draw3D(GL10 gl){}; 

/** 
* Sets the projection to the ortho matrix 
*/ 
public void gluOrtho2D(GL10 gl){ 
    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glLoadIdentity(); 
    GLU.gluOrtho2D(gl, 0, getWidth(), 0, getHeight()); 
} 

/** 
* Sets the projection to the perspective matrix 
*/ 
public void gluPerspective(GL10 gl){ 
    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glLoadIdentity(); 
    float aspectRatio = (float)getWidth()/getHeight(); 
    GLU.gluPerspective(gl, 67, aspectRatio, 1, 100); 
} 

/** 
* Sets the projection to the perspective matrix 
*/ 
public void gluPerspective(GL10 gl, float near, float far){ 
    gl.glMatrixMode(GL10.GL_PROJECTION); 
    gl.glLoadIdentity(); 
    float aspectRatio = (float)getWidth()/getHeight(); 
    GLU.gluPerspective(gl, 67, aspectRatio, near, far); 
} 

/** 
* Sets the projection to the model view matrix 
*/ 
public void gluLookAt(GL10 gl, 
     float positionX, float positionY, float positionZ, 
     float zentrumX, float zentrumY, float zentrumZ, 
     float upX, float upY, float upZ){ 

    gl.glMatrixMode(GL10.GL_MODELVIEW); 
    gl.glLoadIdentity(); 
    GLU.gluLookAt(gl,positionX, positionY, positionZ, zentrumX, zentrumY, zentrumZ, upX, upY, upZ); 
    } 
}