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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
//
//
// fogC.C: Performer program to demonstrate use of fog.  
//        Based on simple.c
//
// $Revision: 1.1 $ 
// $Date: 2000/11/21 21:39:38 $ 
//

#include <stdlib.h>

#include <Performer/pf/pfChannel.h>
#include <Performer/pf/pfLightSource.h>
#include <Performer/pf/pfNode.h>
#include <Performer/pf/pfScene.h>
#include <Performer/pf/pfEarthSky.h>
#include <Performer/pr/pfFog.h>
#include <Performer/pr/pfLinMath.h>

#include <Performer/pfdu.h>


static void OpenPipeWin (pfPipeWindow *pw);
static void DrawChannel (pfChannel *chan, void *data);

pfSphere *bsphere;


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


int
main (int argc, char *argv[])
{
    float       t = 0.0f;
    
    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 standard data directories to PFPATH
    pfFilePath(".:/usr/share/Performer/data");
    
    // Read a single file, of any known type
    pfNode *root = pfdLoadFile(argv[1]);
    if (root == NULL)
    {
	pfExit();
	exit(-1);
    }
    
    // Attach loaded file to a new pfScene
    pfScene *scene = new pfScene;
    scene->addChild(root);
    
    // determine extent of scene's geometry
    scene->getBound(bsphere);
    
    // Create a pfLightSource and attach it to scene
    scene->addChild(new pfLightSource);
    
    
    // Configure and open GL window
    pfPipe *p = pfGetPipe(0);
    pfPipeWindow *pw = new pfPipeWindow(p);
    pw->setName(argv[0]);
    pw->setOriginSize(0,0,500,500);
    pw->setConfigFunc(OpenPipeWin);
    pw->config();
    
    // Create and configure a pfChannel.
    pfChannel *chan = new pfChannel(p);
    chan->setScene(scene);
    chan->setNearFar(1.0f, 10.0f * bsphere->radius);
    chan->setFOV(45.0f, 0.0f);
    chan->setTravFunc(PFTRAV_DRAW,DrawChannel);
    
    
    pfEarthSky *esky = new pfEarthSky;
    esky->setMode(PFES_BUFFER_CLEAR, PFES_SKY_GRND);
    esky->setAttr(PFES_GRND_HT, -1.0f * bsphere->radius);
    esky->setColor(PFES_GRND_FAR, 0.3f, 0.1f, 0.0f, 1.0f);
    esky->setColor(PFES_GRND_NEAR, 0.5f, 0.3f, 0.1f, 1.0f);
    chan->setESky(esky);
    
    // 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);
	view.hpr.set(45.0f*t, -10.0f, 0);
	view.xyz.set(2.0f * bsphere->radius * s,
		     -2.0f * bsphere->radius *c,
		     0.5f * bsphere->radius);
	
	chan->setView(view.xyz, view.hpr);
	
	// Initiate cull/draw for this frame.
	pfFrame();		
    }
    
    // Terminate parallel processes and exit.
    pfExit();
    
    return 0;
}


//
//	OpenPipeWin() -- create a GL window: set up the
//      window system, OpenGL, and OpenGL Performer. This
//      procedure is executed in the draw process (when
//      there is a separate draw process).
//
static void
OpenPipeWin (pfPipeWindow *pw)
{
    // Open graphics window.
    pw->open();
    
    pfFog *fog = new pfFog;
    
    fog->setFogType(PFFOG_VTX_LIN);
    fog->setColor(1.0f, 1.0f, 1.0f);
    pfNotify(PFNFY_NOTICE, PFNFY_PRINT, "Radius: %f", bsphere->radius);
    fog->setRange(1.0f * bsphere->radius, 4.0f * bsphere->radius);
    fog->apply();
    pfEnable (PFEN_FOG);
    pfOverride(PFSTATE_FOG | PFSTATE_ENFOG, PF_ON);
}

// Draw process callback
static void DrawChannel (pfChannel *chan, void *)
{
    chan->clear();
    pfDraw();
}