Androidで画像描画（OpenGL ESを利用）

緑本から。
PolygonSample.java(メインクラス)

package opengl_es.test.polygonsample;

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


public class PolygonSample extends Activity implements GLSurfaceView.Renderer {

	private GLSurfaceView gLSurfaceView;
	
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        
        gLSurfaceView = new GLSurfaceView(this);
        gLSurfaceView.setRenderer(this);

        setContentView(gLSurfaceView);
    }

    public void onDrawFrame(GL10 gl){
    	gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
    	
    	GLU.gluLookAt(gl, 0.0f, 0.0f, 200.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
    	
    	PolygonDrawer.drawBoard(gl,0.0f,0.0f,128,128,255,0,0,255);
    	PolygonDrawer.drawBoard(gl,-60.0f,-120.0f,64,64,0,0,255,255);
    }

    public void onSurfaceChanged(GL10 gl,int width, int height){
    	gl.glViewport(0,0,width,height);
    	float ratio = (float) width / height;
    	gl.glMatrixMode(GL10.GL_PROJECTION);
    	gl.glLoadIdentity();
    	gl.glFrustumf(-ratio, ratio, -1.0f, 1.0f, 1.0f, 1000.0f);
    }

    @Override
	public void onSurfaceCreated(GL10 gl, EGLConfig config) {
		// TODO Auto-generated method stub
	  	gl.glDisable(GL10.GL_DITHER);
    	gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,GL10.GL_FASTEST);
    	gl.glClearColor(0,0,0,1);
    	gl.glEnable(GL10.GL_CULL_FACE);
    	gl.glFrontFace(GL10.GL_CCW);
    	gl.glEnable(GL10.GL_DEPTH_TEST);
    	gl.glShadeModel(GL10.GL_SMOOTH);
	}
    protected void onResume(){
    	super.onResume();
    	gLSurfaceView.onResume();    	
    }
    protected void onPause()
    {
    	super.onPause();
    	gLSurfaceView.onPause();
    }
}

PolygonDrawer.java(描画メソッドを定義)

package opengl_es.test.polygonsample;

import java.nio.IntBuffer;
import javax.microedition.khronos.opengles.GL10;


public class PolygonDrawer {

	/*
	@param gl
	@param x, y
	@param width, height
	@param red, green, blue, alpha
	*/
	
	static void drawBoard(GL10 gl, float x, float y, int width, int height,
			int red, int green, int blue , int alpha)
	{
		int one = 0x10000;
		
		int vertices[] = {
				-width*one/2, -height*one/2,height*one/2,
				width*one/2, -height*one/2,-width*one/2,
				-width*one/2,height*one/2,width*one/2,
				width*one/2,height*one/2,-height*one/2,
		};
		
		int colors[] = {
				one*red/255,one*green/255,one*blue/255,one*alpha/255,
				one*red/255,one*green/255,one*blue/255,one*alpha/255,
				one*red/255,one*green/255,one*blue/255,one*alpha/255,
				one*red/255,one*green/255,one*blue/255,one*alpha/255,
		};
		
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
		gl.glDisable(GL10.GL_TEXTURE_2D);
		gl.glMatrixMode(GL10.GL_MODELVIEW);
		gl.glLoadIdentity();
		gl.glPushMatrix();
		gl.glTranslatef(x, y, 0);
		gl.glVertexPointer(3, GL10.GL_FIXED, 0, IntBuffer.wrap(vertices));
		gl.glColorPointer(4, GL10.GL_FIXED, 0, IntBuffer.wrap(colors));
		gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
		gl.glPopMatrix();
		gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
		
	}
	
	

}