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Initial check-in based on OpenGL Performer 2.4 tree.
-flynnt

/*
 * Copyright 1995, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 *
 * This source code ("Source Code") was originally derived from a
 * code base owned by Silicon Graphics, Inc. ("SGI")
 * 
 * LICENSE: SGI grants the user ("Licensee") permission to reproduce,
 * distribute, and create derivative works from this Source Code,
 * provided that: (1) the user reproduces this entire notice within
 * both source and binary format redistributions and any accompanying
 * materials such as documentation in printed or electronic format;
 * (2) the Source Code is not to be used, or ported or modified for
 * use, except in conjunction with OpenGL Performer; and (3) the
 * names of Silicon Graphics, Inc.  and SGI may not be used in any
 * advertising or publicity relating to the Source Code without the
 * prior written permission of SGI.  No further license or permission
 * may be inferred or deemed or construed to exist with regard to the
 * Source Code or the code base of which it forms a part. All rights
 * not expressly granted are reserved.
 * 
 * This Source Code is provided to Licensee AS IS, without any
 * warranty of any kind, either express, implied, or statutory,
 * including, but not limited to, any warranty that the Source Code
 * will conform to specifications, any implied warranties of
 * merchantability, fitness for a particular purpose, and freedom
 * from infringement, and any warranty that the documentation will
 * conform to the program, or any warranty that the Source Code will
 * be error free.
 * 
 * IN NO EVENT WILL SGI BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT
 * LIMITED TO DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES,
 * ARISING OUT OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THE
 * SOURCE CODE, WHETHER OR NOT BASED UPON WARRANTY, CONTRACT, TORT OR
 * OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM,
 * OR AROSE OUT OF USE OR RESULTS FROM USE OF, OR LACK OF ABILITY TO
 * USE, THE SOURCE CODE.
 * 
 * Contact information:  Silicon Graphics, Inc., 
 * 1600 Amphitheatre Pkwy, Mountain View, CA  94043, 
 * or:  http://www.sgi.com
 *
 * text.c:    simple Performer program to demonstrate using 
 *            GL text
 *
 * $Revision: 1.1 $ 
 * $Date: 2000/11/21 21:39:37 $ 
 *
 */

#include <stdlib.h>
#include <string.h>

#include <Performer/pf.h>
#include <Performer/pfdu.h>


static void DrawChannel(pfChannel *chan, void *data);

static pfMatrix idmat ={{1.0f, 0.0f, 0.0f, 0.0f},
                        {0.0f, 1.0f, 0.0f, 0.0f},
                        {0.0f, 0.0f, 1.0f, 0.0f},
                        {0.0f, 0.0f, 0.0f, 1.0f}};

pfSphere *bsphere;



/*
 * Would normally use pfuXFont routines, see pfuXFont man page
 */

static char fontName[] ="-*-courier-bold-r-normal--14-*-*-*-m-90-iso8859-1";
static int fontDLHandle;
static XFontStruct *fontInfo;

#define FIRSTGLYPH	32
#define LASTGLYPH	128

void loadXFont(void)
{
    Display *xdisplay;

	/* get font from X Server */
    xdisplay = pfGetCurWSConnection();
    fontInfo = XLoadQueryFont(xdisplay, fontName);
    if(fontInfo == NULL){
        pfNotify(PFNFY_FATAL, PFNFY_USAGE, "loadXFont: Couldn't load X font\n");
        exit(1);
    }

	/* Create GL display lists for font */
    pfNotify(PFNFY_NOTICE, PFNFY_PRINT, "loadXFont: making X font display "
        "lists\n");
    fontDLHandle = glGenLists((GLuint) LASTGLYPH + 1);
    if(fontDLHandle == 0)
    {
        pfNotify(PFNFY_FATAL, PFNFY_USAGE, "loadXFont: Couldn't get %d "
            "display lists\n", LASTGLYPH + 1);
        exit(1);
    }
    glXUseXFont(fontInfo->fid, FIRSTGLYPH, LASTGLYPH - FIRSTGLYPH + 1, 
        fontDLHandle + FIRSTGLYPH);
}

void drawXFontString(char *s)
{
    glPushAttrib(GL_LIST_BIT);
    glListBase(fontDLHandle);
    glCallLists(strlen(s), GL_UNSIGNED_BYTE, (GLubyte *)s);
    glPopAttrib();
}



static void OpenPipeWin(pfPipeWindow *pw)
{
    pfOpenPWin(pw);
    loadXFont();
}

static void 
    DrawChannel (pfChannel *channel, void *data)
{
    static pfMatrix tempmat, tempmat2;
    
    pfClearChan (channel);
    pfDraw();
    

    glDepthFunc(GL_ALWAYS); /* always draw */
    glDepthMask(GL_FALSE);

    
    /* text moving with the scene */
    pfPushState();
    
    pfBasicState();
    

    glRasterPos3f(0.5f * bsphere->radius, 0.0f, 0.5f * bsphere->radius);
    glColor3ub(255,255,255);
    drawXFontString("Text-in-Scene");

    
    pfPopState();
    
    /* text overlaid on top of scene, like a HUD */
    pfPushState();
    pfBasicState();
    

    glGetFloatv(GL_PROJECTION_MATRIX, (GLfloat *)tempmat);

    glMatrixMode(GL_PROJECTION);
    glLoadMatrixf((GLfloat *)idmat);
    glOrtho(-10.0, 10.0, -10.0, 10.0, 1.0, -1.0);

    glMatrixMode(GL_MODELVIEW);

    
    pfPushMatrix();
    pfLoadMatrix(idmat);


    glRasterPos2f (-3.0f, 0.0f);
    drawXFontString("text over scene");


    pfPopMatrix();
    

    glMatrixMode(GL_PROJECTION);
    glLoadMatrixf((GLfloat *)tempmat);
    glMatrixMode(GL_MODELVIEW);


    pfPopState();
    

    glDepthFunc(GL_LEQUAL);
    glDepthMask(GL_TRUE);

}

/*
 *	Usage() -- print usage advice and exit. This
 *      procedure is executed in the application process.
 */
static void
    Usage (void)
{
    pfNotify(PFNFY_FATAL, PFNFY_USAGE, "Usage: text file.ext ...\n");
    exit(1);
}


int
    main (int argc, char *argv[])
{
    float       t = 0.0f;
    pfScene     *scene;
    pfPipe      *p;
    pfPipeWindow *pw;
    pfChannel   *chan;
    pfNode	*root;
    
    if (argc < 2)
	Usage();
    
    /* Initialize Performer */
    pfInit();	
    
    /* Use default multiprocessing mode based on number of
     * processors.
     */
    pfMultiprocess( PFMP_DEFAULT );			
    bsphere = (pfSphere*) pfMalloc (sizeof(pfSphere), pfGetSharedArena());
    
    /* Load all loader DSO's before pfConfig() forks */
    pfdInitConverter(argv[1]);

    /* Configure multiprocessing mode and start parallel
     * processes.
     */
    pfConfig();			
    
    /* Append to PFPATH additional standard directories where 
     * geometry and textures exist 
     */
    pfFilePath(".:/usr/share/Performer/data");
    
    /* Read a single file, of any known type. */
    if ((root = pfdLoadFile(argv[1])) == NULL) 
    {
	pfExit();
	exit(-1);
    }
    
    /* Attach loaded file to a pfScene. */
    scene = pfNewScene();
    pfAddChild(scene, root);
    
    /* determine extent of scene's geometry */
    pfGetNodeBSphere (scene, bsphere);
    
    /* Create a pfLightSource and attach it to scene. */
    pfAddChild(scene, pfNewLSource());
    
    /* Configure and open GL window */
    p = pfGetPipe(0);
    pw = pfNewPWin(p);
    pfPWinType(pw, PFPWIN_TYPE_X);
    pfPWinName(pw, argv[0]);
    pfPWinOriginSize(pw, 0, 0, 500, 500);
    /* Open and configure the GL window. */
    pfPWinConfigFunc(pw, OpenPipeWin);
    pfConfigPWin(pw);

    
    /* Create and configure a pfChannel. */
    chan = pfNewChan(p);	
    pfChanTravFunc(chan, PFTRAV_DRAW, DrawChannel);
    pfChanScene(chan, scene);
    pfChanNearFar(chan, 1.0f, 10.0f * bsphere->radius);
    pfChanFOV(chan, 45.0f, 0.0f);
    
    
    /* Simulate for twenty seconds. */
    while (t < 20.0f)
    {
	float      s, c;
	pfCoord	   view;
	
	/* Go to sleep until next frame time. */
	pfSync();		
	
	/* Compute new view position. */
	t = pfGetTime();
	pfSinCos(45.0f*t, &s, &c);
	pfSetVec3(view.hpr, 45.0f*t, -10.0f, 0);
	pfSetVec3(view.xyz, 2.0f * bsphere->radius * s, 
		  -2.0f * bsphere->radius *c, 
		  0.5f * bsphere->radius);
	pfChanView(chan, view.xyz, view.hpr);
	
	/* Initiate cull/draw for this frame. */
	pfFrame();		
    }
    
    /* Terminate parallel processes and exit. */
    pfExit();
    
    return 0;
}