/*
* 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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*
* This Source Code is provided to Licensee AS IS, without any
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* including, but not limited to, any warranty that the Source Code
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*
* Contact information: Silicon Graphics, Inc.,
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*/
/*
* env.c environment functions, ie. weather, time of day, etc
*
* $Revision: 1.1 $
* $Date: 2000/11/21 21:39:43 $
*
*/
#include <math.h>
#include <Performer/pf.h>
#include <Performer/pfutil.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 = pfNewLSource();
ViewState->sunDCS = pfNewDCS();
/* Point in direction of view for easier LIGHTING_EYE computation */
pfLSourcePos(ViewState->sun, 0.0f, -1.0f, 0.0f, 0.0f);
pfAddChild(ViewState->scene, ViewState->sunDCS);
pfAddChild(ViewState->sunDCS, ViewState->sun);
es = pfNewESky();
pfESkyMode(es, PFES_BUFFER_CLEAR, ViewState->earthSkyMode);
pfESkyAttr(es, PFES_GRND_HT, -0.5f * ViewState->sceneSize);
pfESkyColor(es, PFES_CLEAR,
ViewState->earthSkyColor[0],
ViewState->earthSkyColor[1],
ViewState->earthSkyColor[2],
ViewState->earthSkyColor[3]);
pfESkyAttr(es, PFES_HORIZ_ANGLE, TOTAL_HORIZ_ANGLE);
/* setup the fog for general visibility */
eskyFog = pfNewFog(pfGetSharedArena());
pfSetVec3(fogColor, .6f, .6f, .6f);
if(ViewState->fog != PFFOG_OFF)
{
pfFogType(eskyFog, ViewState->fog);
pfFogColor(eskyFog,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay);
pfFogRange(eskyFog, 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;
pfESkyMode(es, PFES_BUFFER_CLEAR, ViewState->earthSkyMode);
if (ViewState->fog != PFFOG_OFF)
{
pfFogType(eskyFog, ViewState->fog);
pfFogRange(eskyFog, ViewState->nearFogRange, ViewState->farFogRange);
pfESkyFog(es, PFES_GENERAL, eskyFog);
pfFogColor(eskyFog,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay);
pfESkyColor(es, PFES_CLEAR,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay,
ViewState->earthSkyColor[3]);
}
else
{
pfESkyFog(es, PFES_GENERAL, NULL);
pfESkyColor(es, 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;
/* 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;
pfCopyVec3(prevViewDir, ViewState->viewMat[1]);
es = ViewState->eSky;
/* make horizon band angle directly proportional to time of day */
pfESkyAttr(es, 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);
pfESkyColor(es, 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);
pfESkyColor(es, 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);
pfESkyColor(es, 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);
pfESkyColor(es, PFES_GRND_NEAR, r ,g, b, 1.0f);
pfESkyColor(es, PFES_GRND_FAR, r ,g, b, 1.0f);
/* Scale fog color based on time of day */
if (ViewState->fog != PFFOG_OFF)
{
pfFogColor(eskyFog,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay);
pfESkyColor(es, PFES_CLEAR,
fogColor[0] * ViewState->timeOfDay,
fogColor[1] * ViewState->timeOfDay,
fogColor[2] * ViewState->timeOfDay,
ViewState->earthSkyColor[3]);
}
/* Here we set the light position. */
pfCombineVec3(t, tod, noon, 1.0f - tod, night);
pfNormalizeVec3(t);
if (ViewState->lighting == LIGHTING_SUN)
{
pfMatrix mat;
static pfVec3 nyaxis = {0.0f, -1.0f, 0.0f};
pfMakeVecRotVecMat(mat, nyaxis, t);
pfDCSMat(ViewState->sunDCS, mat);
pfLSourceColor(ViewState->sun, PFLT_AMBIENT,
0.8f*tod, 0.8f*tod, 0.8f*tod);
}
else /* LIGHTING_EYE */
{
pfLSourceColor(ViewState->sun, PFLT_AMBIENT, 0.0f, 0.0f, 0.0f);
pfDCSMat(ViewState->sunDCS, ViewState->viewMat);
}
pfLSourceColor(ViewState->sun, PFLT_DIFFUSE,
0.8f*tod, 0.8f*tod, 0.8f*tod);
pfLSourceColor(ViewState->sun, PFLT_SPECULAR,
0.8f*tod, 0.8f*tod, 0.8f*tod);
}
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