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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
 *
 * doubleDCS.c : demonstrate a double-precision DCS node.
 *
 * $Revision: 1.1 $ $Date: 2000/11/21 21:39:36 $ 
 *
 */

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

void loadIdentityChannelViewMatrix(pfChannel *chan);
void loadViewingMatrixOnDoubleDCS (pfDoubleDCS *ddcs, pfCoordd *coord);

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


int
main (int argc, char *argv[])
{
    float	    t = 0.0f;
    pfScene	    *scene;
    pfNode	    *root;
    pfPipe	    *p;
    pfPipeWindow    *pw;
    pfChannel	    *chan;
    pfSphere	    bsphere;
    pfCoordd	    double_view;
    pfDoubleDCS	    *double_dcs;

    if (argc < 2)
	Usage();

    /* Initialize Performer */
    pfInit();	

    /* Use default multiprocessing mode based on number of
     * processors.
     */
    pfMultiprocess( PFMP_DEFAULT );			

    /* Load all loader DSO's before pfConfig() forks */
    pfdInitConverter(argv[1]);

    /* initiate multi-processing mode set in pfMultiprocess call 
     * FORKs for Performer processes,  CULL and DRAW, etc. happen here.
     */
    pfConfig();			

    /* Append to Performer search path, PFPATH, files in 
     *	    /usr/share/Performer/data */
    pfFilePath(".:/usr/share/Performer/data");

    /* Read a single file, of any known type. */
    if ((root = pfdLoadFile(argv[1])) == NULL) 
    {
	pfExit();
	exit(-1);
    }

    /* Make a double-precision DCS node */

    double_dcs = pfNewDoubleDCS();

    /* Attach loaded file to a new pfScene. */
    scene = pfNewScene();

    pfAddChild(scene, double_dcs);
    pfAddChild(double_dcs, root);

    /* 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, "Double-Precision DCS");
    pfPWinOriginSize(pw, 0, 0, 500, 500);
    /* Open and configure the GL window. */
    pfOpenPWin(pw);
    
    /* Create and configure a pfChannel. */
    chan = pfNewChan(p);	
    pfChanScene(chan, scene);
    pfChanFOV(chan, 45.0f, 0.0f);

    /* determine extent of scene's geometry */
    pfGetNodeBSphere (root, &bsphere);
    pfChanNearFar(chan, 1.0f, 10.0f * bsphere.radius);

    /* Simulate for twenty seconds. */
    while (t < 20.0f)
    {
	float      s, c;

	/* Go to sleep until next frame time. */
	pfSync();		

	/* Initiate cull/draw for this frame. */
	pfFrame();
	
	/* Compute new view position. */
	t = pfGetTime();
	pfSinCos(45.0f*t, &s, &c);

	pfSetVec3d(double_view.hpr, 45.0f*t, -10.0f, 0);
	pfSetVec3d(double_view.xyz, 2.0f * bsphere.radius * s, 
			-2.0f * bsphere.radius *c, 
			 0.5f * bsphere.radius);

	/*
	 *    Instead of loading the new coordinates on the channel 
	 *    viewing matrix, as load identity on the channel and
	 *    load the double-dcs with the inverse of the desired viewing 
	 *    matrix.
	 */
	loadIdentityChannelViewMatrix(chan);
	loadViewingMatrixOnDoubleDCS (double_dcs, &double_view);
    }

    /* Terminate parallel processes and exit. */
    pfExit();
}

void
loadIdentityChannelViewMatrix(pfChannel *chan)
{
    pfChanViewMat(chan, pfIdentMat);
}

void 
loadViewingMatrixOnDoubleDCS (pfDoubleDCS *ddcs, pfCoordd *coord)
{
    pfMatrix4d		mat, invMat;

    pfMakeCoorddMat4d (mat, coord);

    pfInvertOrthoNMat4d (invMat, mat);

    pfDoubleDCSMat (ddcs, invMat);
}