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-/**
- * @file llatmosphere.cpp
- * @brief LLAtmosphere integration impl
- *
- * $LicenseInfo:firstyear=2018&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2018, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
-
-#include "linden_common.h"
-
-#include "llatmosphere.h"
-#include "llfasttimer.h"
-#include "llsys.h"
-#include "llglheaders.h"
-#include "llrender.h"
-#include "llshadermgr.h"
-#include "llglslshader.h"
-
-LLAtmosphere* gAtmosphere = nullptr;
-
-// Values from "Reference Solar Spectral Irradiance: ASTM G-173", ETR column
-// (see http://rredc.nrel.gov/solar/spectra/am1.5/ASTMG173/ASTMG173.html),
-// summed and averaged in each bin (e.g. the value for 360nm is the average
-// of the ASTM G-173 values for all wavelengths between 360 and 370nm).
-// Values in W.m^-2.
-const int kLambdaMin = 360;
-const int kLambdaMax = 830;
-const double kSolarIrradiance[48] = {
- 1.11776, 1.14259, 1.01249, 1.14716, 1.72765, 1.73054, 1.6887, 1.61253,
- 1.91198, 2.03474, 2.02042, 2.02212, 1.93377, 1.95809, 1.91686, 1.8298,
- 1.8685, 1.8931, 1.85149, 1.8504, 1.8341, 1.8345, 1.8147, 1.78158, 1.7533,
- 1.6965, 1.68194, 1.64654, 1.6048, 1.52143, 1.55622, 1.5113, 1.474, 1.4482,
- 1.41018, 1.36775, 1.34188, 1.31429, 1.28303, 1.26758, 1.2367, 1.2082,
- 1.18737, 1.14683, 1.12362, 1.1058, 1.07124, 1.04992
-};
-
-// Values from http://www.iup.uni-bremen.de/gruppen/molspec/databases/
-// referencespectra/o3spectra2011/index.html for 233K, summed and averaged in
-// each bin (e.g. the value for 360nm is the average of the original values
-// for all wavelengths between 360 and 370nm). Values in m^2.
-const double kOzoneCrossSection[48] = {
- 1.18e-27, 2.182e-28, 2.818e-28, 6.636e-28, 1.527e-27, 2.763e-27, 5.52e-27,
- 8.451e-27, 1.582e-26, 2.316e-26, 3.669e-26, 4.924e-26, 7.752e-26, 9.016e-26,
- 1.48e-25, 1.602e-25, 2.139e-25, 2.755e-25, 3.091e-25, 3.5e-25, 4.266e-25,
- 4.672e-25, 4.398e-25, 4.701e-25, 5.019e-25, 4.305e-25, 3.74e-25, 3.215e-25,
- 2.662e-25, 2.238e-25, 1.852e-25, 1.473e-25, 1.209e-25, 9.423e-26, 7.455e-26,
- 6.566e-26, 5.105e-26, 4.15e-26, 4.228e-26, 3.237e-26, 2.451e-26, 2.801e-26,
- 2.534e-26, 1.624e-26, 1.465e-26, 2.078e-26, 1.383e-26, 7.105e-27
-};
-
-// From https://en.wikipedia.org/wiki/Dobson_unit, in molecules.m^-2.
-const double kDobsonUnit = 2.687e20;
-// Maximum number density of ozone molecules, in m^-3 (computed so at to get
-// 300 Dobson units of ozone - for this we divide 300 DU by the integral of
-// the ozone density profile defined below, which is equal to 15km).
-const double kMaxOzoneNumberDensity = 300.0 * kDobsonUnit / 15000.0;
-const double kRayleigh = 1.24062e-6;
-const double kRayleighScaleHeight = 8000.0;
-const double kMieScaleHeight = 1200.0;
-const double kMieAngstromAlpha = 0.0;
-const double kMieAngstromBeta = 5.328e-3;
-const double kMieSingleScatteringAlbedo = 0.9;
-const double kGroundAlbedo = 0.1;
-
-AtmosphericModelSettings::AtmosphericModelSettings()
- : m_skyBottomRadius(6360.0f)
- , m_skyTopRadius(6420.0f)
- , m_sunArcRadians(0.00045f)
- , m_mieAnisotropy(0.8f)
-{
- DensityLayer rayleigh_density(0.0, 1.0, -1.0 / kRayleighScaleHeight, 0.0, 0.0);
- DensityLayer mie_density(0.0, 1.0, -1.0 / kMieScaleHeight, 0.0, 0.0);
-
- m_rayleighProfile.push_back(rayleigh_density);
- m_mieProfile.push_back(mie_density);
-
- // Density profile increasing linearly from 0 to 1 between 10 and 25km, and
- // decreasing linearly from 1 to 0 between 25 and 40km. This is an approximate
- // profile from http://www.kln.ac.lk/science/Chemistry/Teaching_Resources/
- // Documents/Introduction%20to%20atmospheric%20chemistry.pdf (page 10).
- m_absorptionProfile.push_back(DensityLayer(25000.0, 0.0, 0.0, 1.0 / 15000.0, -2.0 / 3.0));
- m_absorptionProfile.push_back(DensityLayer(0.0, 0.0, 0.0, -1.0 / 15000.0, 8.0 / 3.0));
-}
-
-AtmosphericModelSettings::AtmosphericModelSettings(
- DensityProfile& rayleighProfile,
- DensityProfile& mieProfile,
- DensityProfile& absorptionProfile)
-: m_skyBottomRadius(6360.0f)
-, m_skyTopRadius(6420.0f)
-, m_rayleighProfile(rayleighProfile)
-, m_mieProfile(mieProfile)
-, m_absorptionProfile(absorptionProfile)
-, m_sunArcRadians(0.00045f)
-, m_mieAnisotropy(0.8f)
-{
-}
-
-AtmosphericModelSettings::AtmosphericModelSettings(
- F32 skyBottomRadius,
- F32 skyTopRadius,
- DensityProfile& rayleighProfile,
- DensityProfile& mieProfile,
- DensityProfile& absorptionProfile,
- F32 sunArcRadians,
- F32 mieAniso)
-: m_skyBottomRadius(skyBottomRadius)
-, m_skyTopRadius(skyTopRadius)
-, m_rayleighProfile(rayleighProfile)
-, m_mieProfile(mieProfile)
-, m_absorptionProfile(absorptionProfile)
-, m_sunArcRadians(sunArcRadians)
-, m_mieAnisotropy(mieAniso)
-{
-}
-
-bool AtmosphericModelSettings::operator==(const AtmosphericModelSettings& rhs) const
-{
- if (m_skyBottomRadius != rhs.m_skyBottomRadius)
- {
- return false;
- }
-
- if (m_skyTopRadius != rhs.m_skyTopRadius)
- {
- return false;
- }
-
- if (m_sunArcRadians != rhs.m_sunArcRadians)
- {
- return false;
- }
-
- if (m_mieAnisotropy != rhs.m_mieAnisotropy)
- {
- return false;
- }
-
- if (m_rayleighProfile != rhs.m_rayleighProfile)
- {
- return false;
- }
-
- if (m_mieProfile != rhs.m_mieProfile)
- {
- return false;
- }
-
- if (m_absorptionProfile != rhs.m_absorptionProfile)
- {
- return false;
- }
-
- return true;
-}
-
-void LLAtmosphere::initClass()
-{
- if (!gAtmosphere)
- {
- gAtmosphere = new LLAtmosphere;
- }
-}
-
-void LLAtmosphere::cleanupClass()
-{
- if(gAtmosphere)
- {
- delete gAtmosphere;
- }
- gAtmosphere = NULL;
-}
-
-LLAtmosphere::LLAtmosphere()
-{
- for (int l = kLambdaMin; l <= kLambdaMax; l += 10)
- {
- double lambda = static_cast<double>(l) * 1e-3; // micro-meters
- double mie = kMieAngstromBeta / kMieScaleHeight * pow(lambda, -kMieAngstromAlpha);
- m_wavelengths.push_back(l);
- m_solar_irradiance.push_back(kSolarIrradiance[(l - kLambdaMin) / 10]);
- m_rayleigh_scattering.push_back(kRayleigh * pow(lambda, -4));
- m_mie_scattering.push_back(mie * kMieSingleScatteringAlbedo);
- m_mie_extinction.push_back(mie);
- m_absorption_extinction.push_back(kMaxOzoneNumberDensity * kOzoneCrossSection[(l - kLambdaMin) / 10]);
- m_ground_albedo.push_back(kGroundAlbedo);
- }
-
- AtmosphericModelSettings defaults;
- configureAtmosphericModel(defaults);
-}
-
-LLAtmosphere::~LLAtmosphere()
-{
- // Cease referencing textures from atmosphere::model from our LLGLTextures wrappers for same.
- if (m_transmittance)
- {
- m_transmittance->setTexName(0);
- }
-
- if (m_scattering)
- {
- m_scattering->setTexName(0);
- }
-
- if (m_mie_scatter_texture)
- {
- m_mie_scatter_texture->setTexName(0);
- }
-}
-
-bool LLAtmosphere::configureAtmosphericModel(AtmosphericModelSettings& settings)
-{
- // TBD
- return true;
-}
-
-LLGLTexture* LLAtmosphere::getTransmittance()
-{
- if (!m_transmittance)
- {
- m_transmittance = new LLGLTexture;
- m_transmittance->generateGLTexture();
- m_transmittance->setAddressMode(LLTexUnit::eTextureAddressMode::TAM_CLAMP);
- m_transmittance->setFilteringOption(LLTexUnit::eTextureFilterOptions::TFO_BILINEAR);
- m_transmittance->setExplicitFormat(GL_RGB32F, GL_RGB, GL_FLOAT);
- m_transmittance->setTarget(GL_TEXTURE_2D, LLTexUnit::TT_TEXTURE);
- }
- return m_transmittance;
-}
-
-LLGLTexture* LLAtmosphere::getScattering()
-{
- if (!m_scattering)
- {
- m_scattering = new LLGLTexture;
- m_scattering->generateGLTexture();
- m_scattering->setAddressMode(LLTexUnit::eTextureAddressMode::TAM_CLAMP);
- m_scattering->setFilteringOption(LLTexUnit::eTextureFilterOptions::TFO_BILINEAR);
- m_scattering->setExplicitFormat(GL_RGB16F, GL_RGB, GL_FLOAT);
- m_scattering->setTarget(GL_TEXTURE_3D, LLTexUnit::TT_TEXTURE_3D);
- }
- return m_scattering;
-}
-
-LLGLTexture* LLAtmosphere::getMieScattering()
-{
- if (!m_mie_scatter_texture)
- {
- m_mie_scatter_texture = new LLGLTexture;
- m_mie_scatter_texture->generateGLTexture();
- m_mie_scatter_texture->setAddressMode(LLTexUnit::eTextureAddressMode::TAM_CLAMP);
- m_mie_scatter_texture->setFilteringOption(LLTexUnit::eTextureFilterOptions::TFO_BILINEAR);
- m_mie_scatter_texture->setExplicitFormat(GL_RGB16F, GL_RGB, GL_FLOAT);
- m_mie_scatter_texture->setTarget(GL_TEXTURE_3D, LLTexUnit::TT_TEXTURE_3D);
- }
- return m_mie_scatter_texture;
-}
-
-LLGLTexture* LLAtmosphere::getIlluminance()
-{
- if (!m_illuminance)
- {
- m_illuminance = new LLGLTexture;
- m_illuminance->generateGLTexture();
- m_illuminance->setAddressMode(LLTexUnit::eTextureAddressMode::TAM_CLAMP);
- m_illuminance->setFilteringOption(LLTexUnit::eTextureFilterOptions::TFO_BILINEAR);
- m_illuminance->setExplicitFormat(GL_RGB32F, GL_RGB, GL_FLOAT);
- m_illuminance->setTarget(GL_TEXTURE_2D, LLTexUnit::TT_TEXTURE);
- }
- return m_illuminance;
-}
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