Android Open GL

MobileApp > Android > Open GL

Open GL †

　　　As a superclass GL, GL10 implements the OpenGL ES 1.0
　　　In the Android, contains the primary API for OpenGL ES 1.1 .

　　　Android NDK corresponds to OpenGL.
　　　Android NDK r3 later on, can access open gl directly.

Step1：A OpenGL program painting the gray color to background †

Screen †

Sample Program †

package com.chinsanSoft;

import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.opengl.GLSurfaceView;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

public class test02 extends Activity {
   private GLSurfaceView mChinSurfaceView;

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       mChinSurfaceView = new GLSurfaceView(this);
       mChinSurfaceView.setRenderer(new ChinTutorial());
       setContentView(mChinSurfaceView);
   }
}

class ChinTutorial implements GLSurfaceView.Renderer {

  public ChinTutorial( ) {
   }
   

    public void onDrawFrame(GL10 gl){
   //protected void drawFrame(GL10 gl) {

       //Fill the background
       gl.glClear(GL10.GL_COLOR_BUFFER_BIT|GL10.GL_DEPTH_BUFFER_BIT);
   }

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

    public void onSurfaceCreated(GL10 gl, EGLConfig config) {

        //Specifies the background fill color
        gl.glClearColor(0.5f,0.5f,0.5f,1);
        
        gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,GL10.GL_FASTEST);
    }

}

Step2：A OpenGL programs painting a square †

Screen †

Sample Program †

package com.chinsanSoft;

// A OpenGL programs painting a square
import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.opengl.*;
import java.nio.*;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

public class test03_3d extends Activity {
   private GLSurfaceView mChinSurfaceView;
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       mChinSurfaceView = new GLSurfaceView(this);
       mChinSurfaceView.setRenderer(new ChinTutorialOne());
       setContentView(mChinSurfaceView);
   }
}


class ChinTutorialOne implements GLSurfaceView.Renderer {

   float[] square=new float[] { // vertex    
           -0.25f,-0.25f,0.0f,
            0.25f,-0.25f,0.0f,
           -0.25f, 0.25f,0.0f,
            0.25f, 0.25f,0.0f};

   FloatBuffer squareBuff ; // buffer of vertex
	
	
  public ChinTutorialOne(/*Context c*/) {
	    squareBuff=getFloatBuffer(square); // buffer of vertex
       //super(c);
   }

   
  	private FloatBuffer getFloatBuffer(float [] array){
		FloatBuffer floatBuffer;
		ByteBuffer bb = ByteBuffer.allocateDirect(array.length * 4);
		bb.order(ByteOrder.nativeOrder());
		floatBuffer = bb.asFloatBuffer();
		floatBuffer.put(array);
		floatBuffer.position(0);
		return floatBuffer;
	}
 
    public void onDrawFrame(GL10 gl){
   //protected void drawFrame(GL10 gl) {

       // Background fill
       gl.glClear(GL10.GL_COLOR_BUFFER_BIT|GL10.GL_DEPTH_BUFFER_BIT);

       // Specifying the modelview matrix
       gl.glMatrixMode(GL10.GL_MODELVIEW);
       gl.glLoadIdentity();
       gl.glTranslatef(0,0,-1);  // Moving at parallel
       
       // Specify the color
       gl.glColor4f(1,0,0,0.5f);
       
       // Specify the vertex array
       gl.glVertexPointer(3,GL10.GL_FLOAT,0,squareBuff);
       gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
       
       // Drawing the primitives
       gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP,0,4);
       
    
    }

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

    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        // Specify background fill color
        gl.glClearColor(0.5f,0.5f,0.5f,1);
        
        // Color and texture coordinate interpolation accuracy - fast
        //gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,GL10.GL_FASTEST);

        // Specifying the projection matrix
        gl.glMatrixMode(GL10.GL_PROJECTION);
        gl.glLoadIdentity();
        GLU.gluOrtho2D(gl,0.0f,1.2f,0.0f,1.0f); 
    }

Step3：A OpenGL program that displays the cube †

Screen †

Sample Program †

　　　Under construction

Modeling †

　　ポリゴン表示とテクスチャ表示ができたら、次にやりたくなるのは自分でモデリングしたオブジェクトを表示させること
　　http://ronor.blog81.fc2.com/blog-category-1.html

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