JOGLで背景テクスチャの上にポリゴンを描画する

JOGLで背景テクスチャの上にポリゴンを描画するには、以下のコードを実行します。

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

public class JoglSample43
{
    // 出力画像サイズ
    private static int width = 300;
    private static int height = 300;

    private static Texture texture = null;

    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)
            {
                try
                {
                texture = TextureIO.newTexture(
                    new File("sf.jpg"), true);
                }
                catch(IOException ioex){}
            }

            public void display(GLAutoDrawable dr)
            {
                GL gl = dr.getGL();
                GLUT glut = new GLUT();

                gl.glViewport(0, 0, width, height);
                // 平行投影
                gl.glMatrixMode(GL.GL_PROJECTION);
                gl.glLoadIdentity();
                gl.glOrtho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);

                // 背景テクスチャを描画
                gl.glClear(GL.GL_COLOR_BUFFER_BIT |GL.GL_DEPTH_BUFFER_BIT );
                gl.glDisable(GL.GL_DEPTH_TEST);
                texture.enable();
                gl.glBindTexture(GL.GL_TEXTURE_2D, 
                  texture.getTextureObject());
                gl.glBegin(GL.GL_QUADS);
                gl.glTexCoord2f(0.0f, 1.0f);
                gl.glVertex2f(-1.0f, -1.0f);
                gl.glTexCoord2f(0.0f, 0.0f);
                gl.glVertex2f(-1.0f, 1.0f);
                gl.glTexCoord2f(1.0f, 0.0f);
                gl.glVertex2f(1.0f, 1.0f);
                gl.glTexCoord2f(1.0f, 1.0f);
                gl.glVertex2f(1.0f, -1.0f);
                gl.glEnd();
                texture.disable();

                // 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, -7.0f);

                gl.glEnable(GL.GL_LIGHTING);
                gl.glEnable(GL.GL_LIGHT0);
                gl.glEnable(gl.GL_COLOR_MATERIAL);
                gl.glEnable(GL.GL_NORMALIZE);
                gl.glEnable(GL.GL_DEPTH_TEST);
                gl.glEnable(GL.GL_CULL_FACE);

                gl.glPushMatrix();
                // 面の色を設定
                gl.glColor3f(
                    (float)0x77/(float)0xff, 
                    (float)0x99/(float)0xff, 
                    (float)0xff/(float)0xff
                );
                // X軸回転
                gl.glRotatef(10.0f, 1.0f, 0.0f, 0.0f);
                // Y軸回転
                gl.glRotatef(20.0f, 0.0f, 1.0f, 0.0f);
                // 8面体を描画
                glut.glutSolidOctahedron();
                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("sample1201a.png"), width, height, true);
        context.release();
        context.destroy();
    }
}

出力画像(sample1201a.png)


動作環境
JDK6 Upadate13, JOGL 1.1.1