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/**
* @file llvostars.cpp
* @brief LLVOStars class implementation
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2008, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "llviewerprecompiledheaders.h"
#include "llvostars.h"
#include "lldrawpoolstars.h"
#include "llface.h"
#include "llsky.h"
#include "llvosky.h"
#include "llworld.h"
#include "pipeline.h"
const U32 NUMBER_OF_STARS = 1000;
const F32 DISTANCE_TO_STARS = (HORIZON_DIST - 10.f)*0.25f;
LLVOStars::LLVOStars(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp)
: LLStaticViewerObject(id, pcode, regionp)
{
initStars();
}
LLVOStars::~LLVOStars()
{
delete[] mStarVertices;
mStarVertices = NULL;
delete[] mStarColors;
mStarColors = NULL;
delete[] mStarIntensities;
mStarIntensities = NULL;
}
LLDrawable *LLVOStars::createDrawable(LLPipeline *pipeline)
{
pipeline->allocDrawable(this);
mDrawable->setLit(FALSE);
LLDrawPoolStars *poolp = (LLDrawPoolStars*) gPipeline.getPool(LLDrawPool::POOL_STARS);
mFace = mDrawable->addFace(poolp, NULL);
mDrawable->setRenderType(LLPipeline::RENDER_TYPE_STARS);
mFace->setSize(NUMBER_OF_STARS, NUMBER_OF_STARS);
return mDrawable;
}
BOOL LLVOStars::idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time)
{
return TRUE;
}
BOOL LLVOStars::updateGeometry(LLDrawable *drawable)
{
updateStarColors();
updateStarGeometry(drawable);
LLPipeline::sCompiles++;
return TRUE;
}
BOOL LLVOStars::updateStarGeometry(LLDrawable *drawable)
{
LLStrider<LLVector3> verticesp;
LLStrider<LLVector3> normalsp;
LLStrider<LLVector2> texCoordsp;
LLStrider<LLColor4U> colorsp;
LLStrider<U32> indicesp;
S32 index_offset;
if (mFace->mVertexBuffer.isNull())
{
mFace->mVertexBuffer = new LLVertexBuffer(LLDrawPoolStars::VERTEX_DATA_MASK, GL_STREAM_DRAW_ARB);
mFace->mVertexBuffer->allocateBuffer(mFace->getGeomCount(), mFace->getIndicesCount(), TRUE);
mFace->setGeomIndex(0);
mFace->setIndicesIndex(0);
}
index_offset = mFace->getGeometryColors(verticesp,normalsp,texCoordsp,colorsp, indicesp);
if (-1 == index_offset)
{
return TRUE;
}
for (U32 vtx = 0; vtx < NUMBER_OF_STARS; ++vtx)
{
*(verticesp++) = mStarVertices[vtx];
*(colorsp++) = LLColor4U(mStarColors[vtx]);
*(indicesp++) = index_offset + vtx;
}
return TRUE;
}
void LLVOStars::initStars()
{
// Initialize star map
mStarVertices = new LLVector3 [NUMBER_OF_STARS];
mStarColors = new LLColor4 [NUMBER_OF_STARS];
mStarIntensities = new F32 [NUMBER_OF_STARS];
LLVector3 * v_p = mStarVertices;
LLColor4 * v_c = mStarColors;
F32 * v_i = mStarIntensities;
U32 i;
for (i = 0; i < NUMBER_OF_STARS; i++ )
{
v_p->mV[VX] = ll_frand() - 0.5f;
v_p->mV[VY] = ll_frand() - 0.5f;
// we only want stars on the top half of the dome!
v_p->mV[VZ] = ll_frand()/2.f;
v_p->normVec();
*v_p *= DISTANCE_TO_STARS;
*v_i = llmin((F32)pow(ll_frand(),2.f) + 0.1f, 1.f);
v_c->mV[VRED] = 0.75f + ll_frand() * 0.25f ;
v_c->mV[VGREEN] = 1.f ;
v_c->mV[VBLUE] = 0.75f + ll_frand() * 0.25f ;
v_c->mV[VALPHA] = 1.f;
v_c->clamp();
v_p++;
v_c++;
v_i++;
}
}
void LLVOStars::updateStarColors()
{
LLColor4 * v_c;
v_c = mStarColors;
F32 * v_i = mStarIntensities;
LLVector3* v_p = mStarVertices;
const F32 var = 0.15f;
const F32 min = 0.5f; //0.75f;
const F32 sunclose_max = 0.6f;
const F32 sunclose_range = 1 - sunclose_max;
F32 below_horizon = - llmin(0.0f, gSky.mVOSkyp->getToSunLast().mV[2]);
F32 brightness_factor = llmin(1.0f, below_horizon * 20);
static S32 swap = 0;
swap++;
if ((swap % 2) == 1)
{
F32 intensity; // max intensity of each star
U32 x;
for (x = 0; x < NUMBER_OF_STARS; x++)
{
F32 sundir_factor = 1;
LLVector3 tostar = *v_p;
tostar.normVec();
const F32 how_close_to_sun = tostar * gSky.mVOSkyp->getToSunLast();
if (how_close_to_sun > sunclose_max)
{
sundir_factor = (1 - how_close_to_sun) / sunclose_range;
}
intensity = *(v_i);
F32 alpha = v_c->mV[VALPHA] + (ll_frand() - 0.5f) * var * intensity;
if (alpha < min * intensity)
{
alpha = min * intensity;
}
if (alpha > intensity)
{
alpha = intensity;
}
alpha *= brightness_factor * sundir_factor;
alpha = llclamp(alpha, 0.f, 1.f);
v_c->mV[VALPHA] = alpha;
v_c++;
v_i++;
v_p++;
}
}
}
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