16 files changed, 540 insertions, 134 deletions

diff --git a/indra/llrender/CMakeLists.txt b/indra/llrender/CMakeLists.txt
index 331f988382..dcfbd71dec 100644
--- a/indra/llrender/CMakeLists.txt
+++ b/indra/llrender/CMakeLists.txt
@@ -13,6 +13,7 @@ include(LLVFS)
 include(LLWindow)
 include(LLXML)
 include(LLVFS)
+include(Atmosphere)
 
 include_directories(
     ${FREETYPE_INCLUDE_DIRS}
@@ -24,6 +25,7 @@ include_directories(
     ${LLWINDOW_INCLUDE_DIRS}
     ${LLXML_INCLUDE_DIRS}
     ${LLVFS_INCLUDE_DIRS}
+    ${ATMOSPHERE_INCLUDE_DIR}
     )
 include_directories(SYSTEM
     ${LLCOMMON_SYSTEM_INCLUDE_DIRS}
@@ -31,6 +33,7 @@ include_directories(SYSTEM
     )
 
 set(llrender_SOURCE_FILES
+    llatmosphere.cpp
     llcubemap.cpp
     llfontbitmapcache.cpp
     llfontfreetype.cpp
@@ -56,6 +59,7 @@ set(llrender_SOURCE_FILES
 set(llrender_HEADER_FILES
     CMakeLists.txt
 
+    llatmosphere.h
     llcubemap.h
     llfontgl.h
     llfontfreetype.h
@@ -103,7 +107,9 @@ if (BUILD_HEADLESS)
     ${LLXML_LIBRARIES}
     ${LLVFS_LIBRARIES}
     ${LLWINDOW_HEADLESS_LIBRARIES}
-    ${OPENGL_HEADLESS_LIBRARIES})
+    ${LIBATMOSPHERE_LIBRARIES}
+    ${OPENGL_HEADLESS_LIBRARIES}
+    )
 
 endif (BUILD_HEADLESS)
 
@@ -126,5 +132,7 @@ target_link_libraries(llrender
     ${LLVFS_LIBRARIES}
     ${LLWINDOW_LIBRARIES}
     ${FREETYPE_LIBRARIES}
-    ${OPENGL_LIBRARIES})
+	${LIBATMOSPHERE_LIBRARIES}
+    ${OPENGL_LIBRARIES}
+    )
 
diff --git a/indra/llrender/llatmosphere.cpp b/indra/llrender/llatmosphere.cpp
new file mode 100644
index 0000000000..8840f49454
--- /dev/null
+++ b/indra/llrender/llatmosphere.cpp
@@ -0,0 +1,221 @@
+/** 
+ * @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;
+
+void LLAtmosphere::initClass()
+{
+    if (!gAtmosphere)
+    { 
+        gAtmosphere = new LLAtmosphere; 
+    }
+}
+
+void LLAtmosphere::cleanupClass()
+{
+    if(gAtmosphere)
+    {
+        delete gAtmosphere;
+    }
+    gAtmosphere = NULL;
+}
+
+LLAtmosphere::LLAtmosphere()
+{
+    // Init libatmosphere model
+    m_config.num_scattering_orders = 4;
+
+    // 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 kSunAngularRadius = 0.00935 / 2.0;
+    const double kBottomRadius = 6360000.0;
+    const double kTopRadius = 6420000.0;
+    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 kMiePhaseFunctionG = 0.8;
+    const double max_sun_zenith_angle = F_PI * 2.0 / 3.0;
+
+    atmosphere::DensityProfileLayer rayleigh_density(0.0, 1.0, -1.0 / kRayleighScaleHeight, 0.0, 0.0);
+    atmosphere::DensityProfileLayer mie_density(0.0, 1.0, -1.0 / kMieScaleHeight, 0.0, 0.0);
+
+    // 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).
+    std::vector<atmosphere::DensityProfileLayer> ozone_density;
+    ozone_density.push_back(atmosphere::DensityProfileLayer(25000.0, 0.0, 0.0, 1.0 / 15000.0, -2.0 / 3.0));
+    ozone_density.push_back(atmosphere::DensityProfileLayer(0.0, 0.0, 0.0, -1.0 / 15000.0, 8.0 / 3.0));
+
+    std::vector<double> wavelengths;
+    std::vector<double> solar_irradiance;
+    std::vector<double> rayleigh_scattering;
+    std::vector<double> mie_scattering;
+    std::vector<double> mie_extinction;
+    std::vector<double> absorption_extinction;
+    std::vector<double> ground_albedo;
+
+    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);
+        wavelengths.push_back(l);
+        solar_irradiance.push_back(kSolarIrradiance[(l - kLambdaMin) / 10]);
+        rayleigh_scattering.push_back(kRayleigh * pow(lambda, -4));
+        mie_scattering.push_back(mie * kMieSingleScatteringAlbedo);
+        mie_extinction.push_back(mie);
+        absorption_extinction.push_back(kMaxOzoneNumberDensity * kOzoneCrossSection[(l - kLambdaMin) / 10]);
+        ground_albedo.push_back(0.1f);
+    }
+
+    m_model = new atmosphere::Model(
+                                wavelengths,
+                                solar_irradiance,
+                                kSunAngularRadius,
+                                kBottomRadius,
+                                kTopRadius,
+                                {rayleigh_density},
+                                rayleigh_scattering,
+                                {mie_density},
+                                mie_scattering,
+                                mie_extinction,
+                                kMiePhaseFunctionG,
+                                ozone_density,
+                                absorption_extinction,
+                                ground_albedo,
+                                max_sun_zenith_angle,
+                                1000.0,   
+                                15,
+                                false,
+                                true);
+
+    m_model->Init(m_config, m_textures);
+
+    m_transmittance  = new LLGLTexture;
+    m_scattering     = new LLGLTexture;
+    m_mie_scattering = new LLGLTexture;
+
+    m_transmittance->generateGLTexture();
+    m_transmittance->setAddressMode(LLTexUnit::eTextureAddressMode::TAM_CLAMP);
+    m_transmittance->setFilteringOption(LLTexUnit::eTextureFilterOptions::TFO_BILINEAR);
+    m_transmittance->setExplicitFormat(GL_RGB16F, GL_RGB, GL_FLOAT);
+    m_transmittance->setTexName(m_textures.transmittance_texture);
+    m_transmittance->setTarget(GL_TEXTURE_2D, LLTexUnit::TT_TEXTURE);
+
+    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->setTexName(m_textures.transmittance_texture);
+    m_scattering->setTarget(GL_TEXTURE_3D, LLTexUnit::TT_TEXTURE_3D);
+
+    m_mie_scattering->generateGLTexture();
+    m_mie_scattering->setAddressMode(LLTexUnit::eTextureAddressMode::TAM_CLAMP);
+    m_mie_scattering->setFilteringOption(LLTexUnit::eTextureFilterOptions::TFO_BILINEAR);
+    m_mie_scattering->setExplicitFormat(GL_RGB16F, GL_RGB, GL_FLOAT);
+    m_mie_scattering->setTexName(m_textures.transmittance_texture);
+    m_mie_scattering->setTarget(GL_TEXTURE_3D, LLTexUnit::TT_TEXTURE_3D);
+};
+
+LLAtmosphere::~LLAtmosphere()
+{
+    // Cease referencing textures from atmosphere::model from our LLGLTextures wrappers for same.
+    m_transmittance->setTexName(0);
+    m_scattering->setTexName(0);
+    m_mie_scattering->setTexName(0);
+
+    delete m_model;
+    m_model = nullptr;
+}
+
+LLGLTexture* LLAtmosphere::getTransmittance() const
+{
+    return m_transmittance;
+}
+
+LLGLTexture* LLAtmosphere::getScattering() const
+{
+    return m_scattering;
+}
+
+LLGLTexture* LLAtmosphere::getMieScattering() const
+{
+    return m_mie_scattering;
+}
+
+GLuint LLAtmosphere::getAtmosphericShaderForLink() const
+{
+    return m_model ? m_model->GetShader() : 0;
+}
diff --git a/indra/llrender/llatmosphere.h b/indra/llrender/llatmosphere.h
new file mode 100644
index 0000000000..4aa36be27f
--- /dev/null
+++ b/indra/llrender/llatmosphere.h
@@ -0,0 +1,72 @@
+/** 
+ * @file llatmosphere.h
+ * @brief LLAtmosphere class for integration with libatmosphere
+ *
+ * $LicenseInfo:firstyear=2018&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_ATMOSPHERE_H
+#define LL_ATMOSPHERE_H
+
+#include "llglheaders.h"
+#include "llgltexture.h"
+#include "libatmosphere/model.h"
+
+class LLAtmosphere
+{
+public:
+     LLAtmosphere();
+    ~LLAtmosphere();
+
+    static void initClass();
+    static void cleanupClass();
+
+    const LLAtmosphere& operator=(const LLAtmosphere& rhs)
+    {
+        LL_ERRS() << "Illegal operation!" << LL_ENDL;
+        return *this;
+    }
+
+    LLGLTexture* getTransmittance() const;
+    LLGLTexture* getScattering() const;
+    LLGLTexture* getMieScattering() const;
+
+    GLuint getAtmosphericShaderForLink() const;
+
+protected:    
+    LLAtmosphere(const LLAtmosphere& rhs)
+    {
+        *this = rhs;
+    }
+
+    atmosphere::ModelConfig         m_config;    
+    atmosphere::PrecomputedTextures m_textures;
+    atmosphere::Model*              m_model = nullptr;
+
+    LLPointer<LLGLTexture> m_transmittance;
+    LLPointer<LLGLTexture> m_scattering;
+    LLPointer<LLGLTexture> m_mie_scattering;
+};
+
+extern LLAtmosphere* gAtmosphere;
+
+#endif // LL_ATMOSPHERE_H
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 155c2402bd..2f78b6e104 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -1348,8 +1348,19 @@ void LLGLManager::initExtensions()
 	if (mHasVertexShader)
 	{
 		LL_INFOS() << "initExtensions() VertexShader-related procs..." << LL_ENDL;
-		glGetAttribLocationARB = (PFNGLGETATTRIBLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetAttribLocationARB");
-		glBindAttribLocationARB = (PFNGLBINDATTRIBLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glBindAttribLocationARB");
+
+        // nSight doesn't support use of ARB funcs that have been normalized in the API
+        if (!LLRender::sNsightDebugSupport)
+        {
+		    glGetAttribLocationARB = (PFNGLGETATTRIBLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetAttribLocationARB");
+		    glBindAttribLocationARB = (PFNGLBINDATTRIBLOCATIONARBPROC) GLH_EXT_GET_PROC_ADDRESS("glBindAttribLocationARB");
+        }
+        else
+        {
+            glGetAttribLocationARB = (PFNGLGETATTRIBLOCATIONARBPROC)GLH_EXT_GET_PROC_ADDRESS("glGetAttribLocation");
+            glBindAttribLocationARB = (PFNGLBINDATTRIBLOCATIONARBPROC)GLH_EXT_GET_PROC_ADDRESS("glBindAttribLocation");
+        }
+
 		glGetActiveAttribARB = (PFNGLGETACTIVEATTRIBARBPROC) GLH_EXT_GET_PROC_ADDRESS("glGetActiveAttribARB");
 		glVertexAttrib1dARB = (PFNGLVERTEXATTRIB1DARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1dARB");
 		glVertexAttrib1dvARB = (PFNGLVERTEXATTRIB1DVARBPROC) GLH_EXT_GET_PROC_ADDRESS("glVertexAttrib1dvARB");
diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index bba94a976f..a5939a6eb9 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -374,6 +374,8 @@ void LLGLSLShader::unloadInternal()
     stop_glerror();
 }
 
+#pragma optimize("", off)
+
 BOOL LLGLSLShader::createShader(std::vector<LLStaticHashedString> * attributes,
                                 std::vector<LLStaticHashedString> * uniforms,
                                 U32 varying_count,
@@ -401,6 +403,11 @@ BOOL LLGLSLShader::createShader(std::vector<LLStaticHashedString> * attributes,
     mDefines["OLD_SELECT"] = "1";
 #endif
     
+    if (mExtraLinkObject)
+    {
+        attachObject(mExtraLinkObject);
+    }
+
     //compile new source
     vector< pair<string,GLenum> >::iterator fileIter = mShaderFiles.begin();
     for ( ; fileIter != mShaderFiles.end(); fileIter++ )
@@ -485,6 +492,8 @@ BOOL LLGLSLShader::createShader(std::vector<LLStaticHashedString> * attributes,
     return success;
 }
 
+#pragma optimize("", on)
+
 BOOL LLGLSLShader::attachObject(std::string object)
 {
     if (LLShaderMgr::instance()->mShaderObjects.count(object) > 0)
diff --git a/indra/llrender/llglslshader.h b/indra/llrender/llglslshader.h
index 8e9c29ea4c..a7a9e27fcd 100644
--- a/indra/llrender/llglslshader.h
+++ b/indra/llrender/llglslshader.h
@@ -205,6 +205,8 @@ public:
 	bool mTextureStateFetched;
     magmin_filter_t mTextureMagMinFilter;
 
+    GLhandleARB mExtraLinkObject = 0;
+
 private:
 	void unloadInternal();
 
diff --git a/indra/llrender/llgltexture.cpp b/indra/llrender/llgltexture.cpp
index 3a6eebebba..c0e5477cea 100644
--- a/indra/llrender/llgltexture.cpp
+++ b/indra/llrender/llgltexture.cpp
@@ -30,20 +30,20 @@
 // static
 S32 LLGLTexture::getTotalNumOfCategories() 
 {
-	return MAX_GL_IMAGE_CATEGORY - (BOOST_HIGH - BOOST_SCULPTED) + 2 ;
+	return MAX_GL_IMAGE_CATEGORY - (BOOST_HIGH - BOOST_SCULPTED) + 2;
 }
 
 // static
 //index starts from zero.
 S32 LLGLTexture::getIndexFromCategory(S32 category) 
 {
-	return (category < BOOST_HIGH) ? category : category - (BOOST_HIGH - BOOST_SCULPTED) + 1 ;
+	return (category < BOOST_HIGH) ? category : category - (BOOST_HIGH - BOOST_SCULPTED) + 1;
 }
 
 //static 
 S32 LLGLTexture::getCategoryFromIndex(S32 index)
 {
-	return (index < BOOST_HIGH) ? index : index + (BOOST_HIGH - BOOST_SCULPTED) - 1 ;
+	return (index < BOOST_HIGH) ? index : index + (BOOST_HIGH - BOOST_SCULPTED) - 1;
 }
 
 LLGLTexture::LLGLTexture(BOOL usemipmaps)
@@ -55,19 +55,19 @@ LLGLTexture::LLGLTexture(BOOL usemipmaps)
 LLGLTexture::LLGLTexture(const U32 width, const U32 height, const U8 components, BOOL usemipmaps)
 {
 	init();
-	mFullWidth = width ;
-	mFullHeight = height ;
+	mFullWidth = width;
+	mFullHeight = height;
 	mUseMipMaps = usemipmaps;
-	mComponents = components ;
+	mComponents = components;
 	setTexelsPerImage();
 }
 
 LLGLTexture::LLGLTexture(const LLImageRaw* raw, BOOL usemipmaps)
 {
 	init();
-	mUseMipMaps = usemipmaps ;
+	mUseMipMaps = usemipmaps;
 	// Create an empty image of the specified size and width
-	mGLTexturep = new LLImageGL(raw, usemipmaps) ;
+	mGLTexturep = new LLImageGL(raw, usemipmaps);
 }
 
 LLGLTexture::~LLGLTexture()
@@ -81,13 +81,13 @@ void LLGLTexture::init()
 
 	mFullWidth = 0;
 	mFullHeight = 0;
-	mTexelsPerImage = 0 ;
-	mUseMipMaps = FALSE ;
-	mComponents = 0 ;
+	mTexelsPerImage = 0;
+	mUseMipMaps = FALSE;
+	mComponents = 0;
 
-	mTextureState = NO_DELETE ;
+	mTextureState = NO_DELETE;
 	mDontDiscard = FALSE;
-	mNeedsGLTexture = FALSE ;
+	mNeedsGLTexture = FALSE;
 }
 
 void LLGLTexture::cleanup()
@@ -111,287 +111,301 @@ void LLGLTexture::setBoostLevel(S32 level)
 {
 	if(mBoostLevel != level)
 	{
-		mBoostLevel = level ;
+		mBoostLevel = level;
 		if(mBoostLevel != LLGLTexture::BOOST_NONE
 		   && mBoostLevel != LLGLTexture::BOOST_ICON)
 		{
-			setNoDelete() ;		
+			setNoDelete();		
 		}
 	}
 }
 
 void LLGLTexture::forceActive()
 {
-	mTextureState = ACTIVE ; 
+	mTextureState = ACTIVE; 
 }
 
 void LLGLTexture::setActive() 
 { 
 	if(mTextureState != NO_DELETE)
 	{
-		mTextureState = ACTIVE ; 
+		mTextureState = ACTIVE; 
 	}
 }
 
 //set the texture to stay in memory
 void LLGLTexture::setNoDelete() 
 { 
-	mTextureState = NO_DELETE ;
+	mTextureState = NO_DELETE;
 }
 
 void LLGLTexture::generateGLTexture() 
 {	
 	if(mGLTexturep.isNull())
 	{
-		mGLTexturep = new LLImageGL(mFullWidth, mFullHeight, mComponents, mUseMipMaps) ;
+		mGLTexturep = new LLImageGL(mFullWidth, mFullHeight, mComponents, mUseMipMaps);
 	}
 }
 
 LLImageGL* LLGLTexture::getGLTexture() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep ;
+	return mGLTexturep;
 }
 
 BOOL LLGLTexture::createGLTexture() 
 {
 	if(mGLTexturep.isNull())
 	{
-		generateGLTexture() ;
+		generateGLTexture();
 	}
 
-	return mGLTexturep->createGLTexture() ;
+	return mGLTexturep->createGLTexture();
 }
 
 BOOL LLGLTexture::createGLTexture(S32 discard_level, const LLImageRaw* imageraw, S32 usename, BOOL to_create, S32 category)
 {
-	llassert(mGLTexturep.notNull()) ;	
+	llassert(mGLTexturep.notNull());	
 
-	BOOL ret = mGLTexturep->createGLTexture(discard_level, imageraw, usename, to_create, category) ;
+	BOOL ret = mGLTexturep->createGLTexture(discard_level, imageraw, usename, to_create, category);
 
 	if(ret)
 	{
-		mFullWidth = mGLTexturep->getCurrentWidth() ;
-		mFullHeight = mGLTexturep->getCurrentHeight() ; 
-		mComponents = mGLTexturep->getComponents() ;	
+		mFullWidth = mGLTexturep->getCurrentWidth();
+		mFullHeight = mGLTexturep->getCurrentHeight(); 
+		mComponents = mGLTexturep->getComponents();	
 		setTexelsPerImage();
 	}
 
-	return ret ;
+	return ret;
 }
 
 void LLGLTexture::setExplicitFormat(LLGLint internal_format, LLGLenum primary_format, LLGLenum type_format, BOOL swap_bytes)
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 	
-	mGLTexturep->setExplicitFormat(internal_format, primary_format, type_format, swap_bytes) ;
+	mGLTexturep->setExplicitFormat(internal_format, primary_format, type_format, swap_bytes);
 }
 void LLGLTexture::setAddressMode(LLTexUnit::eTextureAddressMode mode)
 {
-	llassert(mGLTexturep.notNull()) ;
-	mGLTexturep->setAddressMode(mode) ;
+	llassert(mGLTexturep.notNull());
+	mGLTexturep->setAddressMode(mode);
 }
 void LLGLTexture::setFilteringOption(LLTexUnit::eTextureFilterOptions option)
 {
-	llassert(mGLTexturep.notNull()) ;
-	mGLTexturep->setFilteringOption(option) ;
+	llassert(mGLTexturep.notNull());
+	mGLTexturep->setFilteringOption(option);
 }
 
 //virtual
 S32	LLGLTexture::getWidth(S32 discard_level) const
 {
-	llassert(mGLTexturep.notNull()) ;
-	return mGLTexturep->getWidth(discard_level) ;
+	llassert(mGLTexturep.notNull());
+	return mGLTexturep->getWidth(discard_level);
 }
 
 //virtual
 S32	LLGLTexture::getHeight(S32 discard_level) const
 {
-	llassert(mGLTexturep.notNull()) ;
-	return mGLTexturep->getHeight(discard_level) ;
+	llassert(mGLTexturep.notNull());
+	return mGLTexturep->getHeight(discard_level);
 }
 
 S32 LLGLTexture::getMaxDiscardLevel() const
 {
-	llassert(mGLTexturep.notNull()) ;
-	return mGLTexturep->getMaxDiscardLevel() ;
+	llassert(mGLTexturep.notNull());
+	return mGLTexturep->getMaxDiscardLevel();
 }
 S32 LLGLTexture::getDiscardLevel() const
 {
-	llassert(mGLTexturep.notNull()) ;
-	return mGLTexturep->getDiscardLevel() ;
+	llassert(mGLTexturep.notNull());
+	return mGLTexturep->getDiscardLevel();
 }
 S8  LLGLTexture::getComponents() const 
 { 
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 	
-	return mGLTexturep->getComponents() ;
+	return mGLTexturep->getComponents();
 }
 
 LLGLuint LLGLTexture::getTexName() const 
 { 
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getTexName() ; 
+	return mGLTexturep->getTexName(); 
 }
 
 BOOL LLGLTexture::hasGLTexture() const 
 {
 	if(mGLTexturep.notNull())
 	{
-		return mGLTexturep->getHasGLTexture() ;
+		return mGLTexturep->getHasGLTexture();
 	}
-	return FALSE ;
+	return FALSE;
 }
 
 BOOL LLGLTexture::getBoundRecently() const
 {
 	if(mGLTexturep.notNull())
 	{
-		return mGLTexturep->getBoundRecently() ;
+		return mGLTexturep->getBoundRecently();
 	}
-	return FALSE ;
+	return FALSE;
 }
 
 LLTexUnit::eTextureType LLGLTexture::getTarget(void) const
 {
-	llassert(mGLTexturep.notNull()) ;
-	return mGLTexturep->getTarget() ;
+	llassert(mGLTexturep.notNull());
+	return mGLTexturep->getTarget();
 }
 
 BOOL LLGLTexture::setSubImage(const LLImageRaw* imageraw, S32 x_pos, S32 y_pos, S32 width, S32 height)
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->setSubImage(imageraw, x_pos, y_pos, width, height) ;
+	return mGLTexturep->setSubImage(imageraw, x_pos, y_pos, width, height);
 }
 
 BOOL LLGLTexture::setSubImage(const U8* datap, S32 data_width, S32 data_height, S32 x_pos, S32 y_pos, S32 width, S32 height)
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->setSubImage(datap, data_width, data_height, x_pos, y_pos, width, height) ;
+	return mGLTexturep->setSubImage(datap, data_width, data_height, x_pos, y_pos, width, height);
 }
 
 void LLGLTexture::setGLTextureCreated (bool initialized)
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	mGLTexturep->setGLTextureCreated (initialized) ;
+	mGLTexturep->setGLTextureCreated (initialized);
 }
 
 void  LLGLTexture::setCategory(S32 category) 
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
+
+	mGLTexturep->setCategory(category);
+}
 
-	mGLTexturep->setCategory(category) ;
+void LLGLTexture::setTexName(LLGLuint texName)
+{
+    llassert(mGLTexturep.notNull());
+    return mGLTexturep->setTexName(texName); 
+}
+
+void LLGLTexture::setTarget(const LLGLenum target, const LLTexUnit::eTextureType bind_target)
+{
+    llassert(mGLTexturep.notNull());
+    return mGLTexturep->setTarget(target, bind_target); 
 }
 
 LLTexUnit::eTextureAddressMode LLGLTexture::getAddressMode(void) const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getAddressMode() ;
+	return mGLTexturep->getAddressMode();
 }
 
 S32Bytes LLGLTexture::getTextureMemory() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->mTextureMemory ;
+	return mGLTexturep->mTextureMemory;
 }
 
 LLGLenum LLGLTexture::getPrimaryFormat() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getPrimaryFormat() ;
+	return mGLTexturep->getPrimaryFormat();
 }
 
 BOOL LLGLTexture::getIsAlphaMask() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getIsAlphaMask() ;
+	return mGLTexturep->getIsAlphaMask();
 }
 
 BOOL LLGLTexture::getMask(const LLVector2 &tc)
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getMask(tc) ;
+	return mGLTexturep->getMask(tc);
 }
 
 F32 LLGLTexture::getTimePassedSinceLastBound()
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getTimePassedSinceLastBound() ;
+	return mGLTexturep->getTimePassedSinceLastBound();
 }
 BOOL LLGLTexture::getMissed() const 
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getMissed() ;
+	return mGLTexturep->getMissed();
 }
 
 BOOL LLGLTexture::isJustBound() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->isJustBound() ;
+	return mGLTexturep->isJustBound();
 }
 
 void LLGLTexture::forceUpdateBindStats(void) const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->forceUpdateBindStats() ;
+	return mGLTexturep->forceUpdateBindStats();
 }
 
 U32 LLGLTexture::getTexelsInAtlas() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getTexelsInAtlas() ;
+	return mGLTexturep->getTexelsInAtlas();
 }
 
 U32 LLGLTexture::getTexelsInGLTexture() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getTexelsInGLTexture() ;
+	return mGLTexturep->getTexelsInGLTexture();
 }
 
 BOOL LLGLTexture::isGLTextureCreated() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->isGLTextureCreated() ;
+	return mGLTexturep->isGLTextureCreated();
 }
 
 S32  LLGLTexture::getDiscardLevelInAtlas() const
 {
-	llassert(mGLTexturep.notNull()) ;
+	llassert(mGLTexturep.notNull());
 
-	return mGLTexturep->getDiscardLevelInAtlas() ;
+	return mGLTexturep->getDiscardLevelInAtlas();
 }
 
 void LLGLTexture::destroyGLTexture() 
 {
 	if(mGLTexturep.notNull() && mGLTexturep->getHasGLTexture())
 	{
-		mGLTexturep->destroyGLTexture() ;
-		mTextureState = DELETED ;
+		mGLTexturep->destroyGLTexture();
+		mTextureState = DELETED;
 	}
 }
 
 void LLGLTexture::setTexelsPerImage()
 {
-	S32 fullwidth = llmin(mFullWidth,(S32)MAX_IMAGE_SIZE_DEFAULT);
-	S32 fullheight = llmin(mFullHeight,(S32)MAX_IMAGE_SIZE_DEFAULT);
-	mTexelsPerImage = (F32)fullwidth * fullheight;
+    U32 fullwidth = llmin(mFullWidth, (U32)MAX_IMAGE_SIZE_DEFAULT);
+    U32 fullheight = llmin(mFullHeight, (U32)MAX_IMAGE_SIZE_DEFAULT);
+	mTexelsPerImage = (U32)fullwidth * fullheight;
 }
 
+static LLUUID sStubUUID;
 
+const LLUUID& LLGLTexture::getID() const { return sStubUUID; }
\ No newline at end of file
diff --git a/indra/llrender/llgltexture.h b/indra/llrender/llgltexture.h
index 45592ee077..b8d646ed15 100644
--- a/indra/llrender/llgltexture.h
+++ b/indra/llrender/llgltexture.h
@@ -103,7 +103,7 @@ public:
 
 	virtual void dump();	// debug info to LL_INFOS()
 
-	virtual const LLUUID& getID() const = 0;
+	virtual const LLUUID& getID() const;
 
 	void setBoostLevel(S32 level);
 	S32  getBoostLevel() { return mBoostLevel; }
@@ -132,6 +132,8 @@ public:
 	BOOL       setSubImage(const U8* datap, S32 data_width, S32 data_height, S32 x_pos, S32 y_pos, S32 width, S32 height);
 	void       setGLTextureCreated (bool initialized);
 	void       setCategory(S32 category) ;
+    void       setTexName(LLGLuint); // for forcing w/ externally created textures only
+    void       setTarget(const LLGLenum target, const LLTexUnit::eTextureType bind_target);
 
 	LLTexUnit::eTextureAddressMode getAddressMode(void) const ;
 	S32        getMaxDiscardLevel() const;
@@ -178,11 +180,11 @@ protected:
 
 protected:
 	S32 mBoostLevel;				// enum describing priority level
-	S32 mFullWidth;
-	S32 mFullHeight;
+	U32 mFullWidth;
+	U32 mFullHeight;
 	BOOL mUseMipMaps;
 	S8  mComponents;
-	F32 mTexelsPerImage;			// Texels per image.
+	U32 mTexelsPerImage;			// Texels per image.
 	mutable S8  mNeedsGLTexture;
 
 	//GL texture
diff --git a/indra/llrender/llimagegl.cpp b/indra/llrender/llimagegl.cpp
index 20cba68f84..75f6cd405a 100644
--- a/indra/llrender/llimagegl.cpp
+++ b/indra/llrender/llimagegl.cpp
@@ -352,10 +352,9 @@ BOOL LLImageGL::create(LLPointer<LLImageGL>& dest, const LLImageRaw* imageraw, B
 }
 
 //----------------------------------------------------------------------------
-
 LLImageGL::LLImageGL(BOOL usemipmaps)
 :	LLTrace::MemTrackable<LLImageGL>("LLImageGL"),
-	mSaveData(0)
+    mSaveData(0), mExternalTexture(FALSE)
 {
 	init(usemipmaps);
 	setSize(0, 0, 0);
@@ -365,7 +364,7 @@ LLImageGL::LLImageGL(BOOL usemipmaps)
 
 LLImageGL::LLImageGL(U32 width, U32 height, U8 components, BOOL usemipmaps)
 :	LLTrace::MemTrackable<LLImageGL>("LLImageGL"),
-	mSaveData(0)
+    mSaveData(0), mExternalTexture(FALSE)
 {
 	llassert( components <= 4 );
 	init(usemipmaps);
@@ -376,7 +375,7 @@ LLImageGL::LLImageGL(U32 width, U32 height, U8 components, BOOL usemipmaps)
 
 LLImageGL::LLImageGL(const LLImageRaw* imageraw, BOOL usemipmaps)
 :	LLTrace::MemTrackable<LLImageGL>("LLImageGL"),
-	mSaveData(0)
+    mSaveData(0), mExternalTexture(FALSE)
 {
 	init(usemipmaps);
 	setSize(0, 0, 0);
@@ -386,12 +385,36 @@ LLImageGL::LLImageGL(const LLImageRaw* imageraw, BOOL usemipmaps)
 	createGLTexture(0, imageraw); 
 }
 
+LLImageGL::LLImageGL(
+    LLGLuint texName,
+    U32 components,
+    LLGLenum target,
+    LLGLint  formatInternal,
+    LLGLenum formatPrimary,
+    LLGLenum formatType,
+    LLTexUnit::eTextureAddressMode addressMode)
+    : LLTrace::MemTrackable<LLImageGL>("LLImageGL"), mSaveData(0), mExternalTexture(TRUE)
+{
+    init(false);
+    mTexName = texName;
+    mTarget = target;
+    mComponents = components;
+    mAddressMode = addressMode;
+    mFormatType = formatType;
+    mFormatInternal = formatInternal;
+    mFormatPrimary = formatPrimary;
+}
+
+
 LLImageGL::~LLImageGL()
 {
-	LLImageGL::cleanup();
-	sImageList.erase(this);
-	freePickMask();
-	sCount--;
+    if (!mExternalTexture)
+    {
+	    LLImageGL::cleanup();
+	    sImageList.erase(this);
+	    freePickMask();
+	    sCount--;
+    }
 }
 
 void LLImageGL::init(BOOL usemipmaps)
diff --git a/indra/llrender/llimagegl.h b/indra/llrender/llimagegl.h
index ad2aea9067..bb0284a166 100644
--- a/indra/llrender/llimagegl.h
+++ b/indra/llrender/llimagegl.h
@@ -84,7 +84,10 @@ public:
 	LLImageGL(BOOL usemipmaps = TRUE);
 	LLImageGL(U32 width, U32 height, U8 components, BOOL usemipmaps = TRUE);
 	LLImageGL(const LLImageRaw* imageraw, BOOL usemipmaps = TRUE);
-	
+
+    // For wrapping textures created via GL elsewhere with our API only. Use with caution.
+    LLImageGL(LLGLuint mTexName, U32 components, LLGLenum target, LLGLint  formatInternal, LLGLenum formatPrimary, LLGLenum formatType, LLTexUnit::eTextureAddressMode addressMode);
+
 protected:
 	virtual ~LLImageGL();
 
@@ -234,6 +237,8 @@ protected:
 	LLGLenum mFormatType;
 	BOOL	 mFormatSwapBytes;// if true, use glPixelStorei(GL_UNPACK_SWAP_BYTES, 1)
 	
+    BOOL mExternalTexture;
+
 	// STATICS
 public:	
 	static std::set<LLImageGL*> sImageList;
@@ -279,6 +284,8 @@ public:
 	void setCategory(S32 category) {mCategory = category;}
 	S32  getCategory()const {return mCategory;}
 	
+    void setTexName(GLuint texName) { mTexName = texName; }
+
 	//for debug use: show texture size distribution 
 	//----------------------------------------
 	static S32 sCurTexSizeBar ;
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 76f28bb43f..a8f622d3ff 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -49,6 +49,7 @@ U32 LLRender::sUICalls = 0;
 U32 LLRender::sUIVerts = 0;
 U32 LLTexUnit::sWhiteTexture = 0;
 bool LLRender::sGLCoreProfile = false;
+bool LLRender::sNsightDebugSupport = false;
 
 static const U32 LL_NUM_TEXTURE_LAYERS = 32; 
 static const U32 LL_NUM_LIGHT_UNITS = 8;
@@ -58,7 +59,8 @@ static const GLenum sGLTextureType[] =
 	GL_TEXTURE_2D,
 	GL_TEXTURE_RECTANGLE_ARB,
 	GL_TEXTURE_CUBE_MAP_ARB,
-	GL_TEXTURE_2D_MULTISAMPLE
+	GL_TEXTURE_2D_MULTISAMPLE,
+    GL_TEXTURE_3D
 };
 
 static const GLint sGLAddressMode[] =
diff --git a/indra/llrender/llrender.h b/indra/llrender/llrender.h
index a67fb8da52..9ad3a6e593 100644
--- a/indra/llrender/llrender.h
+++ b/indra/llrender/llrender.h
@@ -61,10 +61,11 @@ public:
 	typedef enum
 	{
 		TT_TEXTURE = 0,			// Standard 2D Texture
-		TT_RECT_TEXTURE,	// Non power of 2 texture
-		TT_CUBE_MAP,		// 6-sided cube map texture
+		TT_RECT_TEXTURE,	    // Non power of 2 texture
+		TT_CUBE_MAP,		    // 6-sided cube map texture
 		TT_MULTISAMPLE_TEXTURE, // see GL_ARB_texture_multisample
-		TT_NONE 		// No texture type is currently enabled
+        TT_TEXTURE_3D,          // standard 3D Texture
+		TT_NONE, 		        // No texture type is currently enabled        
 	} eTextureType;
 
 	typedef enum
@@ -438,7 +439,8 @@ public:
 	static U32 sUICalls;
 	static U32 sUIVerts;
 	static bool sGLCoreProfile;
-	
+    static bool sNsightDebugSupport;
+
 private:
 	friend class LLLightState;
 
diff --git a/indra/llrender/llshadermgr.cpp b/indra/llrender/llshadermgr.cpp
index b010a4ae64..287f22783f 100644
--- a/indra/llrender/llshadermgr.cpp
+++ b/indra/llrender/llshadermgr.cpp
@@ -512,16 +512,16 @@ static std::string get_object_log(GLhandleARB ret)
 void LLShaderMgr::dumpObjectLog(GLhandleARB ret, BOOL warns, const std::string& filename) 
 {
 	std::string log = get_object_log(ret);
+    std::string fname = filename;
+    if (filename.empty())
+    {
+        fname = "unknown shader file";
+    }
 
-	if (log.length() > 0 || warns)
+	if (log.length() > 0)
 	{
-        LL_DEBUGS("ShaderLoading") << "Shader loading ";
-        
-		if (!filename.empty())
-		{
-            LL_CONT << "From " << filename << ":\n";
-		}
-        LL_CONT << log << LL_ENDL;
+        LL_INFOS() << "Shader loading from " << fname << ":\n" << LL_ENDL;
+        LL_INFOS() << log << LL_ENDL;
 	}
  }
 
@@ -1114,7 +1114,7 @@ void LLShaderMgr::initAttribsAndUniforms()
 	mReservedUniforms.push_back("specularMap");
 	mReservedUniforms.push_back("bumpMap");
 	mReservedUniforms.push_back("environmentMap");
-	mReservedUniforms.push_back("cloude_noise_texture");
+	mReservedUniforms.push_back("cloud_noise_texture");
 	mReservedUniforms.push_back("fullbright");
 	mReservedUniforms.push_back("lightnorm");
 	mReservedUniforms.push_back("sunlight_color");
@@ -1267,6 +1267,16 @@ void LLShaderMgr::initAttribsAndUniforms()
 
 	mReservedUniforms.push_back("origin");
 	mReservedUniforms.push_back("display_gamma");
+
+    mReservedUniforms.push_back("inscatter");
+    mReservedUniforms.push_back("sun_size");
+    mReservedUniforms.push_back("fog_color");
+
+    mReservedUniforms.push_back("transmittance_texture");
+    mReservedUniforms.push_back("scattering_texture");
+    mReservedUniforms.push_back("irradiance_texture");
+    mReservedUniforms.push_back("single_mie_scattering_texture");
+
 	llassert(mReservedUniforms.size() == END_RESERVED_UNIFORMS);
 
 	std::set<std::string> dupe_check;
diff --git a/indra/llrender/llshadermgr.h b/indra/llrender/llshadermgr.h
index 7bdd97200d..ac3f7d58d5 100644
--- a/indra/llrender/llshadermgr.h
+++ b/indra/llrender/llshadermgr.h
@@ -221,6 +221,17 @@ public:
 		
 		SHINY_ORIGIN,
         DISPLAY_GAMMA,
+
+        INSCATTER_RT,
+        SUN_SIZE,
+        FOG_COLOR,
+
+        // precomputed textures from libatmosphere
+        TRANSMITTANCE_TEX,
+        SCATTER_TEX,
+        ILLUMINANCE_TEX,
+        SINGLE_MIE_SCATTER_TEX,
+
 		END_RESERVED_UNIFORMS
 	} eGLSLReservedUniforms;
 
diff --git a/indra/llrender/lltexture.cpp b/indra/llrender/lltexture.cpp
index 90fbcec2be..787a09a159 100644
--- a/indra/llrender/lltexture.cpp
+++ b/indra/llrender/lltexture.cpp
@@ -29,3 +29,15 @@
 LLTexture::~LLTexture()
 {
 }
+
+S8   LLTexture::getType() const { llassert(false); return 0; }
+void LLTexture::setKnownDrawSize(S32 width, S32 height) { llassert(false); }
+bool LLTexture::bindDefaultImage(const S32 stage) { llassert(false); return false; }
+bool LLTexture::bindDebugImage(const S32 stage) { llassert(false); return false; }
+void LLTexture::forceImmediateUpdate() { llassert(false); }
+void LLTexture::setActive() { llassert(false);  }
+S32	 LLTexture::getWidth(S32 discard_level) const { llassert(false); return 0; }
+S32	 LLTexture::getHeight(S32 discard_level) const { llassert(false); return 0; }
+bool LLTexture::isActiveFetching() { llassert(false); return false; }
+LLImageGL* LLTexture::getGLTexture() const { llassert(false); return nullptr; }
+void LLTexture::updateBindStatsForTester() { }
\ No newline at end of file
diff --git a/indra/llrender/lltexture.h b/indra/llrender/lltexture.h
index 9fca8b8cd3..41481fb8a7 100644
--- a/indra/llrender/lltexture.h
+++ b/indra/llrender/lltexture.h
@@ -58,21 +58,21 @@ public:
 	//
 	//interfaces to access LLGLTexture
 	//
-	virtual S8         getType() const = 0 ;
-	virtual void       setKnownDrawSize(S32 width, S32 height) = 0 ;
-	virtual bool       bindDefaultImage(const S32 stage = 0) = 0 ;
-	virtual bool       bindDebugImage(const S32 stage = 0) = 0;
-	virtual void       forceImmediateUpdate() = 0 ;
-	virtual void       setActive() = 0 ;
-	virtual S32	       getWidth(S32 discard_level = -1) const = 0 ;
-	virtual S32	       getHeight(S32 discard_level = -1) const = 0 ;
-	virtual bool       isActiveFetching() = 0;
+	virtual S8         getType() const;
+	virtual void       setKnownDrawSize(S32 width, S32 height);
+	virtual bool       bindDefaultImage(const S32 stage = 0);
+	virtual bool       bindDebugImage(const S32 stage = 0);
+	virtual void       forceImmediateUpdate();
+	virtual void       setActive();
+	virtual S32	       getWidth(S32 discard_level = -1) const;
+	virtual S32	       getHeight(S32 discard_level = -1) const;
+	virtual bool       isActiveFetching();
 
 private:
 	//note: do not make this function public.
-	virtual LLImageGL* getGLTexture() const = 0 ;
+	virtual LLImageGL* getGLTexture() const;
 
-	virtual void updateBindStatsForTester() = 0 ;
+	virtual void updateBindStatsForTester();
 };
 #endif