/*
* Copyright 1993, 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
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* prior written permission of SGI. No further license or permission
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*
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*/
/*
* env.c environment functions, ie. weather, time of day, etc
*
* $Revision: 1.1 $
* $Date: 2000/11/21 21:39:45 $
*
*/
#include <math.h>
/*
#include <Performer/pf.h>
#include <Performer/pfutil.h>
*/
#include <Performer/pf/pfLightSource.h>
#include <Performer/pf/pfScene.h>
#include <Performer/pf/pfEarthSky.h>
#include <Performer/pf/pfDCS.h>
#include <Performer/pr/pfFog.h>
#include "custom.h"
static pfFog *eskyFog;
static pfVec3 fogColor;
#define TOTAL_HORIZ_ANGLE 7.0f
/*-----------------------------------------------------*/
void
initEnvironment(void)
{
pfEarthSky *es;
/* Initialize sun */
ViewState->sun = new pfLightSource();
ViewState->sunDCS = new pfDCS();
/* Point in direction of view for easier LIGHTING_EYE computation */
ViewState->sun->setPos(0.0f, -1.0f, 0.0f, 0.0f);
ViewState->scene->addChild(ViewState->sunDCS);
ViewState->sunDCS->addChild(ViewState->sun);
es = new pfEarthSky();
es->setMode(PFES_BUFFER_CLEAR, ViewState->earthSkyMode);
es->setAttr(PFES_GRND_HT, -0.5f * ViewState->sceneSize);
es->setColor(PFES_CLEAR,
ViewState->earthSkyColor[0],
ViewState->earthSkyColor[1],
ViewState->earthSkyColor[2],
ViewState->earthSkyColor[3]);
es->setAttr(PFES_HORIZ_ANGLE, TOTAL_HORIZ_ANGLE);
/* setup the fog for general visibility */
eskyFog = new pfFog();
fogColor.set(.6f, .6f, .6f);
if(ViewState->fog != PFFOG_OFF)
{
eskyFog->setFogType(ViewState->fog);
eskyFog->setColor(fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay);
eskyFog->setRange(ViewState->nearFogRange, ViewState->farFogRange);
}
ViewState->eSky = es;
}
void
updateEnvironment(void)
{
pfEarthSky *es = ViewState->eSky;
static int earthSkyMode = -1;
static int fog = -1;
static float nearFogRange = 0.0f, farFogRange = 0.0f;
if ((earthSkyMode == ViewState->earthSkyMode) &&
(fog == ViewState->fog) &&
(nearFogRange == ViewState->nearFogRange) &&
(farFogRange == ViewState->farFogRange))
return;
es->setMode(PFES_BUFFER_CLEAR, ViewState->earthSkyMode);
if (ViewState->fog != PFFOG_OFF)
{
eskyFog->setFogType(ViewState->fog);
eskyFog->setRange(ViewState->nearFogRange, ViewState->farFogRange);
es->setFog(PFES_GENERAL, eskyFog);
eskyFog->setColor(fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay);
es->setColor(PFES_CLEAR,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay,
ViewState->earthSkyColor[3]);
}
else
{
es->setFog(PFES_GENERAL, NULL);
es->setColor(PFES_CLEAR,
ViewState->earthSkyColor[0],
ViewState->earthSkyColor[1],
ViewState->earthSkyColor[2],
ViewState->earthSkyColor[3]);
}
/* update static values */
earthSkyMode = ViewState->earthSkyMode;
fog = ViewState->fog;
nearFogRange = ViewState->nearFogRange;
farFogRange = ViewState->farFogRange;
}
void
updateTimeOfDay(float newTod)
{
float r, g, b;
float s;
pfVec3 t;
pfEarthSky *es;
static int lighting = -1;
static float tod = -1.0f;
static pfVec3 noon(-.05f, -.1f, 1.0f);
static pfVec3 night(-.15f, 1.0f, .2f);
static pfVec3 prevViewDir(-1.0f, -1.0f, -1.0f);
/* only do if necessary */
if (ViewState->lighting == lighting && newTod == tod &&
(ViewState->lighting == LIGHTING_SUN ||
PFEQUAL_VEC3(ViewState->viewMat[1], prevViewDir)))
return;
tod = newTod;
lighting = ViewState->lighting;
prevViewDir = *(pfVec3*)ViewState->viewMat.mat[1];
es = ViewState->eSky;
/* make horizon band angle directly proportional to time of day */
es->setAttr(PFES_HORIZ_ANGLE, 1.0f + (TOTAL_HORIZ_ANGLE - 1.0f)*tod);
/* scale it for the following ramp calcs */
s = tod * 4.0f;
/* top of sky */
r = (0.4f * s) - 1.6f; r = PF_MAX2(0.0f, r); r = PF_MIN2(0.7f, r);
g = (0.4f * s) - 1.6f; g = PF_MAX2(0.0f, g); g = PF_MIN2(0.7f, g);
b = (0.8f * s) - 1.6f; b = PF_MAX2(0.0f, b); b = PF_MIN2(1.0f, b);
es->setColor(PFES_SKY_TOP, r,g,b, 1.0f);
/* bottom of sky */
r = (0.6f * s) - 1.6f; r = PF_MAX2(0.0f, r); r = PF_MIN2(0.7f, r);
g = (0.6f * s) - 1.6f; g = PF_MAX2(0.0f, g); g = PF_MIN2(0.7f, g);
b = (1.0f * s) - 1.6f; b = PF_MAX2(0.0f, b); b = PF_MIN2(1.0f, b);
es->setColor(PFES_SKY_BOT, r,g,b, 1.0f);
/* horizon */
r = (1.45f * s) - 0.4f; r = PF_MAX2(0.0f, r); r = PF_MIN2(0.7f, r);
g = (0.65f * s) - 1.4f; g = PF_MAX2(0.0f, g); g = PF_MIN2(0.7f, g);
b = (0.65f * s) - 1.6f; b = PF_MAX2(0.0f, b); b = PF_MIN2(1.0f, b);
es->setColor(PFES_HORIZ, r,g,b, 1.0f);
/* ground */
r = (0.0181f * (s - 0.8f)); r = PF_MAX2(0.0f, r); r = PF_MIN2(0.058f, r);
g = (0.0840f * (s - 0.8f)); g = PF_MAX2(0.0f, g); g = PF_MIN2(0.270f, g);
b = (0.0181f * (s - 0.8f)); b = PF_MAX2(0.0f, b); b = PF_MIN2(0.058f, b);
es->setColor(PFES_GRND_NEAR, r ,g, b, 1.0f);
es->setColor(PFES_GRND_FAR, r ,g, b, 1.0f);
/* Scale fog color based on time of day */
if (ViewState->fog != PFFOG_OFF)
{
eskyFog->setColor(fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay);
es->setColor(PFES_CLEAR,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay,
ViewState->earthSkyColor[3]);
}
/* Here we set the light position and color */
t.combine(tod, noon, 1.0f - tod, night);
t.normalize();
if (ViewState->lighting == LIGHTING_SUN)
{
pfMatrix mat;
static pfVec3 nyaxis(0.0f, -1.0f, 0.0f);
mat.makeVecRotVec(nyaxis, t);
ViewState->sunDCS->setMat(mat);
ViewState->sun->setColor(PFLT_AMBIENT, 0.8f*tod, 0.8f*tod, 0.8f*tod);
}
else /* LIGHTING_EYE */
{
ViewState->sun->setColor(PFLT_AMBIENT, 0.0f, 0.0f, 0.0f);
ViewState->sunDCS->setMat(ViewState->viewMat);
}
ViewState->sun->setColor(PFLT_DIFFUSE, 0.8f*tod, 0.8f*tod, 0.8f*tod);
ViewState->sun->setColor(PFLT_SPECULAR, 0.8f*tod, 0.8f*tod, 0.8f*tod);
}
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