JOGLでビットマップ文字列を描画する

JOGLでビットマップ文字列を描画するには、以下のコードを実行します。

import java.io.*;
import javax.media.opengl.*;
import com.sun.opengl.util.*;

public class JoglSample26
{
    // 出力画像サイズ
    private static int width = 300;
    private static int height = 300;

    public static void main(String args[])
        throws IOException
    {
        GLDrawableFactory gldf = 
            GLDrawableFactory.getFactory();
        GLCapabilities glc = new GLCapabilities();
        glc.setDoubleBuffered(false);
        GLPbuffer buf = gldf.createGLPbuffer(
           glc, null, width, height, null);

        buf.addGLEventListener(
            new GLEventListener(){
            // 初期化
            public void init(GLAutoDrawable dr)
            {
                GL gl = dr.getGL();
                // 背景色
                gl.glClearColor(
                    (float)0x77/(float)0xff, 
                    (float)0x99/(float)0xff, 
                    (float)0xff/(float)0xff,
                    1f);
            }

            public void display(GLAutoDrawable dr)
            {
                GL gl = dr.getGL();
                GLUT glut = new GLUT();
                gl.glViewport(0, 0, width, height);

                // 透視投影
                gl.glMatrixMode(GL.GL_PROJECTION);
                gl.glLoadIdentity();
                float ratio = (float)height/(float)width;
                gl.glFrustum(-1.0f, 1.0f, -ratio, ratio,
                    5.0f, 40.0f);

                gl.glMatrixMode(GL.GL_MODELVIEW);
                gl.glLoadIdentity();
                gl.glTranslatef(0.0f, 0.0f, -12.0f);

                gl.glClear(GL.GL_COLOR_BUFFER_BIT);


                gl.glPushMatrix();
                // ビットマップ文字の描画
                gl.glRasterPos2f(-1f, 0.0f);

                glut.glutBitmapCharacter(GLUT.BITMAP_8_BY_13, 'A');
                glut.glutBitmapCharacter(GLUT.BITMAP_9_BY_15, 'B');
                glut.glutBitmapCharacter(GLUT.BITMAP_HELVETICA_10, 'C');
                glut.glutBitmapCharacter(GLUT.BITMAP_HELVETICA_12, 'D');
                glut.glutBitmapCharacter(GLUT.BITMAP_HELVETICA_18, 'E');
                glut.glutBitmapCharacter(GLUT.BITMAP_TIMES_ROMAN_10, 'F');
                glut.glutBitmapCharacter(GLUT.BITMAP_TIMES_ROMAN_24, 'G');
                // ビットマップ文字列の描画
                glut.glutBitmapString(GLUT.BITMAP_TIMES_ROMAN_24, "123");

                gl.glPopMatrix();
            }

            public void reshape(
                GLAutoDrawable dr,
                int x, int y,
                int width, int height){}

            public void displayChanged(
                GLAutoDrawable dr,
                boolean modeChanged,
                boolean deviceChanged){}
          }
        );

        GLContext context =  buf.createContext(null);
        context.makeCurrent();
        buf.display();
        Screenshot.writeToFile(
            new File("sample1184a.png"), width, height, true);
        context.release();
        context.destroy();
    }
}

出力画像(sample1184a.png)