lltexlayer.cpp

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#include "llviewerprecompiledheaders.h"

#include "imageids.h"
#include "llagent.h"
#include "llcrc.h"
#include "lldir.h"
#include "llglheaders.h"
#include "llimagebmp.h"
#include "llimagej2c.h"
#include "llimagetga.h"
#include "llpolymorph.h"
#include "llquantize.h"
#include "lltexlayer.h"
#include "llui.h"
#include "llvfile.h"
#include "llviewerimagelist.h"
#include "llviewerimagelist.h"
#include "llviewerstats.h"
#include "llviewerwindow.h"
#include "llvoavatar.h"
#include "llxmltree.h"
#include "pipeline.h"
#include "v4coloru.h"
#include "llglimmediate.h"

//#include "../tools/imdebug/imdebug.h"


// SJB: We really always want to use the GL cache;
// let GL page textures in and out of video RAM instead of trying to do so by hand.

LLGradientPaletteList gGradientPaletteList;

// static
S32 LLTexLayerSetBuffer::sGLByteCount = 0;
S32 LLTexLayerSetBuffer::sGLBumpByteCount = 0;

//-----------------------------------------------------------------------------
// LLBakedUploadData()
//-----------------------------------------------------------------------------
LLBakedUploadData::LLBakedUploadData( LLVOAvatar* avatar, LLTexLayerSetBuffer* layerset_buffer ) : 
        mAvatar( avatar ),
        mLayerSetBuffer( layerset_buffer )
{ 
        mID.generate();
        for( S32 i = 0; i < WT_COUNT; i++ )
        {
                LLWearable* wearable = gAgent.getWearable( (EWearableType)i);
                if( wearable )
                {
                        mWearableAssets[i] = wearable->getID();
                }
        }
}

//-----------------------------------------------------------------------------
// LLTexLayerSetBuffer
// The composite image that a LLTexLayerSet writes to.  Each LLTexLayerSet has one.
//-----------------------------------------------------------------------------
LLTexLayerSetBuffer::LLTexLayerSetBuffer( LLTexLayerSet* owner, S32 width, S32 height, BOOL has_bump )
        :
        // ORDER_LAST => must render these after the hints are created.
        LLDynamicTexture( width, height, 4, LLDynamicTexture::ORDER_LAST, TRUE ), 
        mNeedsUpdate( TRUE ),
        mNeedsUpload( FALSE ),
        mUploadPending( FALSE ), // Not used for any logic here, just to sync sending of updates
        mTexLayerSet( owner ),
        mInitialized( FALSE ),
        mBumpTexName(0)
{
        LLTexLayerSetBuffer::sGLByteCount += getSize();

        if( has_bump )
        {
                LLGLSUIDefault gls_ui;
                glGenTextures(1, (GLuint*) &mBumpTexName);

                LLImageGL::bindExternalTexture(mBumpTexName, 0, GL_TEXTURE_2D); 
                stop_glerror();

                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
                stop_glerror();

                LLImageGL::unbindTexture(0, GL_TEXTURE_2D);

                LLImageGL::sGlobalTextureMemory += mWidth * mHeight * 4;
                LLTexLayerSetBuffer::sGLBumpByteCount += mWidth * mHeight * 4;
        }
}

LLTexLayerSetBuffer::~LLTexLayerSetBuffer()
{
        LLTexLayerSetBuffer::sGLByteCount -= getSize();

        if( mBumpTexName )
        {
                glDeleteTextures(1, (GLuint*) &mBumpTexName);
                stop_glerror();
                mBumpTexName = 0;

                LLImageGL::sGlobalTextureMemory -= mWidth * mHeight * 4;
                LLTexLayerSetBuffer::sGLBumpByteCount -= mWidth * mHeight * 4;
        }
}

// static
void LLTexLayerSetBuffer::dumpTotalByteCount()
{
        llinfos << "Composite System GL Buffers: " << (LLTexLayerSetBuffer::sGLByteCount/1024) << "KB" << llendl;
        llinfos << "Composite System GL Bump Buffers: " << (LLTexLayerSetBuffer::sGLBumpByteCount/1024) << "KB" << llendl;
}

void LLTexLayerSetBuffer::requestUpdate()
{
        mNeedsUpdate = TRUE;

        // If we're in the middle of uploading a baked texture, we don't care about it any more.
        // When it's downloaded, ignore it.
        mUploadID.setNull();
}

void LLTexLayerSetBuffer::requestUpload()
{
        if (!mNeedsUpload)
        {
                mNeedsUpload = TRUE;
                mUploadPending = TRUE;
        }
}

void LLTexLayerSetBuffer::cancelUpload()
{
        if (mNeedsUpload)
        {
                mNeedsUpload = FALSE;
        }
        mUploadPending = FALSE;
}

void LLTexLayerSetBuffer::pushProjection()
{
        glMatrixMode(GL_PROJECTION);
        gGL.pushMatrix();
        glLoadIdentity();
        glOrtho(0.0f, mWidth, 0.0f, mHeight, -1.0f, 1.0f);

        glMatrixMode(GL_MODELVIEW);
        gGL.pushMatrix();
        glLoadIdentity();
}

void LLTexLayerSetBuffer::popProjection()
{
        glMatrixMode(GL_PROJECTION);
        gGL.popMatrix();

        glMatrixMode(GL_MODELVIEW);
        gGL.popMatrix();
}

BOOL LLTexLayerSetBuffer::needsRender()
{
        LLVOAvatar* avatar = mTexLayerSet->getAvatar();
        BOOL upload_now = mNeedsUpload && mTexLayerSet->isLocalTextureDataFinal();
        BOOL needs_update = gAgent.mNumPendingQueries == 0 && (mNeedsUpdate || upload_now) && !avatar->mAppearanceAnimating;
        if (needs_update)
        {
                BOOL invalid_skirt = avatar->getBakedTE(mTexLayerSet) == LLVOAvatar::TEX_SKIRT_BAKED && !avatar->isWearingWearableType(WT_SKIRT);
                if (invalid_skirt)
                {
                        // we were trying to create a skirt texture
                        // but we're no longer wearing a skirt...
                        needs_update = FALSE;
                        cancelUpload();
                }
                else
                {
                        needs_update &= (avatar->isSelf() || (avatar->isVisible() && !avatar->isCulled()));
                        needs_update &= mTexLayerSet->isLocalTextureDataAvailable();
                }
        }
        return needs_update;
}

void LLTexLayerSetBuffer::preRender(BOOL clear_depth)
{
        // Set up an ortho projection
        pushProjection();
        
        // keep depth buffer, we don't need to clear it
        LLDynamicTexture::preRender(FALSE);
}

void LLTexLayerSetBuffer::postRender(BOOL success)
{
        popProjection();

        LLDynamicTexture::postRender(success);
}

BOOL LLTexLayerSetBuffer::render()
{
        U8* baked_bump_data = NULL;

        // do we need to upload, and do we have sufficient data to create an uploadable composite?
        // When do we upload the texture if gAgent.mNumPendingQueries is non-zero?
        BOOL upload_now = (gAgent.mNumPendingQueries == 0 && mNeedsUpload && mTexLayerSet->isLocalTextureDataFinal());
        BOOL success = TRUE;

        // Composite bump
        if( mBumpTexName )
        {
                // Composite the bump data
                success &= mTexLayerSet->renderBump( mOrigin.mX, mOrigin.mY, mWidth, mHeight );
                stop_glerror();

                if (success)
                {
                        LLGLSUIDefault gls_ui;

                        // read back into texture (this is done externally for the color data)
                        LLImageGL::bindExternalTexture( mBumpTexName, 0, GL_TEXTURE_2D ); 
                        stop_glerror();

                        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, mOrigin.mX, mOrigin.mY, mWidth, mHeight);
                        stop_glerror();

                        // if we need to upload the data, read it back into a buffer
                        if( upload_now )
                        {
                                baked_bump_data = new U8[ mWidth * mHeight * 4 ];
                                glReadPixels(mOrigin.mX, mOrigin.mY, mWidth, mHeight, GL_RGBA, GL_UNSIGNED_BYTE, baked_bump_data );
                                stop_glerror();
                        }
                }
        }

        // Composite the color data
        LLGLSUIDefault gls_ui;
        success &= mTexLayerSet->render( mOrigin.mX, mOrigin.mY, mWidth, mHeight );
        gGL.flush();

        if( upload_now )
        {
                if (!success)
                {
                        delete [] baked_bump_data;
                        llinfos << "Failed attempt to bake " << mTexLayerSet->getBodyRegion() << llendl;
                        mUploadPending = FALSE;
                }
                else
                {
                        readBackAndUpload(baked_bump_data);
                }
        }

        // reset GL state
        glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
        gGL.blendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );  

        // we have valid texture data now
        mInitialized = TRUE;
        mNeedsUpdate = FALSE;

        return success;
}

BOOL LLTexLayerSetBuffer::updateImmediate()
{
        mNeedsUpdate = TRUE;
        BOOL result = FALSE;

        if (needsRender())
        {
                preRender(FALSE);
                result = render();
                postRender(result);
        }

        return result;
}

void LLTexLayerSetBuffer::readBackAndUpload(U8* baked_bump_data)
{
        // pointers for storing data to upload
        U8* baked_color_data = new U8[ mWidth * mHeight * 4 ];
        
        glReadPixels(mOrigin.mX, mOrigin.mY, mWidth, mHeight, GL_RGBA, GL_UNSIGNED_BYTE, baked_color_data );
        stop_glerror();

        llinfos << "Baked " << mTexLayerSet->getBodyRegion() << llendl;
        LLViewerStats::getInstance()->incStat(LLViewerStats::ST_TEX_BAKES);

        llassert( gAgent.getAvatarObject() == mTexLayerSet->getAvatar() );

        // We won't need our caches since we're baked now.  (Techically, we won't 
        // really be baked until this image is sent to the server and the Avatar
        // Appearance message is received.)
        mTexLayerSet->deleteCaches();

        LLGLSUIDefault gls_ui;

        LLPointer<LLImageRaw> baked_mask_image = new LLImageRaw(mWidth, mHeight, 1 );
        U8* baked_mask_data = baked_mask_image->getData(); 

        mTexLayerSet->gatherAlphaMasks(baked_mask_data, mWidth, mHeight);
//      imdebug("lum b=8 w=%d h=%d %p", mWidth, mHeight, baked_mask_data);


        // writes into baked_color_data
        const char* comment_text = NULL;

        S32 baked_image_components = mBumpTexName ? 5 : 4; // red green blue [bump] clothing
        LLPointer<LLImageRaw> baked_image = new LLImageRaw( mWidth, mHeight, baked_image_components );
        U8* baked_image_data = baked_image->getData();
        
        if( mBumpTexName )
        {
                comment_text = LINDEN_J2C_COMMENT_PREFIX "RGBHM"; // 5 channels: rgb, heightfield/alpha, mask

                // Hide the alpha for the eyelashes in a corner of the bump map
                if (mTexLayerSet->getBodyRegion() == "head")
                {
                        S32 i = 0;
                        for( S32 u = 0; u < mWidth; u++ )
                        {
                                for( S32 v = 0; v < mHeight; v++ )
                                {
                                        baked_image_data[5*i + 0] = baked_color_data[4*i + 0];
                                        baked_image_data[5*i + 1] = baked_color_data[4*i + 1];
                                        baked_image_data[5*i + 2] = baked_color_data[4*i + 2];
                                        baked_image_data[5*i + 3] = baked_color_data[4*i + 3] < 255 ? baked_color_data[4*i + 3] : baked_bump_data[4*i];
                                        baked_image_data[5*i + 4] = baked_mask_data[i];
                                        i++;
                                }
                        }
                }
                else
                {
                        S32 i = 0;
                        for( S32 u = 0; u < mWidth; u++ )
                        {
                                for( S32 v = 0; v < mHeight; v++ )
                                {
                                        baked_image_data[5*i + 0] = baked_color_data[4*i + 0];
                                        baked_image_data[5*i + 1] = baked_color_data[4*i + 1];
                                        baked_image_data[5*i + 2] = baked_color_data[4*i + 2];
                                        baked_image_data[5*i + 3] = baked_bump_data[4*i];
                                        baked_image_data[5*i + 4] = baked_mask_data[i];
                                        i++;
                                }
                        }
                }
        }
        else
        {       
                if (mTexLayerSet->getBodyRegion() == "skirt")
                {
                        S32 i = 0;
                        for( S32 u = 0; u < mWidth; u++ )
                        {
                                for( S32 v = 0; v < mHeight; v++ )
                                {
                                        baked_image_data[4*i + 0] = baked_color_data[4*i + 0];
                                        baked_image_data[4*i + 1] = baked_color_data[4*i + 1];
                                        baked_image_data[4*i + 2] = baked_color_data[4*i + 2];
                                        baked_image_data[4*i + 3] = baked_color_data[4*i + 3];  // Use alpha, not bump
                                        i++;
                                }
                        }
                }
                else
                {
                        S32 i = 0;
                        for( S32 u = 0; u < mWidth; u++ )
                        {
                                for( S32 v = 0; v < mHeight; v++ )
                                {
                                        baked_image_data[4*i + 0] = baked_color_data[4*i + 0];
                                        baked_image_data[4*i + 1] = baked_color_data[4*i + 1];
                                        baked_image_data[4*i + 2] = baked_color_data[4*i + 2];
                                        baked_image_data[4*i + 3] = baked_mask_data[i];
                                        i++;
                                }
                        }
                }
        }
        
        LLPointer<LLImageJ2C> compressedImage = new LLImageJ2C;
        compressedImage->setRate(0.f);
        LLTransactionID tid;
        LLAssetID asset_id;
        tid.generate();
        asset_id = tid.makeAssetID(gAgent.getSecureSessionID());

        BOOL res = false;
        if( compressedImage->encode(baked_image, comment_text))
        {
                res = LLVFile::writeFile(compressedImage->getData(), compressedImage->getDataSize(),
                                                                 gVFS, asset_id, LLAssetType::AT_TEXTURE);
                if (res)
                {
                        LLPointer<LLImageJ2C> integrity_test = new LLImageJ2C;
                        BOOL valid = FALSE;
                        S32 file_size;
                        U8* data = LLVFile::readFile(gVFS, asset_id, LLAssetType::AT_TEXTURE, &file_size);
                        if (data)
                        {
                                valid = integrity_test->validate(data, file_size); // integrity_test will delete 'data'
                        }
                        else
                        {
                                integrity_test->setLastError("Unable to read entire file");
                        }
                        
                        if( valid )
                        {
                                LLBakedUploadData* baked_upload_data = new LLBakedUploadData( gAgent.getAvatarObject(), this );
                                mUploadID = baked_upload_data->mID;

                                gAssetStorage->storeAssetData(tid,
                                                                                          LLAssetType::AT_TEXTURE,
                                                                                          LLTexLayerSetBuffer::onTextureUploadComplete,
                                                                                          baked_upload_data,
                                                                                          TRUE,         // temp_file
                                                                                          FALSE,        // is_priority
                                                                                          TRUE);        // store_local
                
                                mNeedsUpload = FALSE;
                        }
                        else
                        {
                                mUploadPending = FALSE;
                                llinfos << "unable to create baked upload file: corrupted" << llendl;
                                LLVFile file(gVFS, asset_id, LLAssetType::AT_TEXTURE, LLVFile::WRITE);
                                file.remove();
                        }
                }
        }
        if (!res)
        {
                mUploadPending = FALSE;
                llinfos << "unable to create baked upload file" << llendl;
        }

        delete [] baked_color_data;
        delete [] baked_bump_data;
}


// static
void LLTexLayerSetBuffer::onTextureUploadComplete(const LLUUID& uuid, void* userdata, S32 result, LLExtStat ext_status) // StoreAssetData callback (not fixed)
{
        LLBakedUploadData* baked_upload_data = (LLBakedUploadData*)userdata;

        LLVOAvatar* avatar = gAgent.getAvatarObject();

        if (0 == result && avatar && !avatar->isDead())
        {
                // Sanity check: only the user's avatar should be uploading textures.
                if( baked_upload_data->mAvatar == avatar )
                {
                        // Because the avatar is still valid, it's layerset buffers should be valid also.
                        LLTexLayerSetBuffer* layerset_buffer = baked_upload_data->mLayerSetBuffer;
                        layerset_buffer->mUploadPending = FALSE;
                        
                        if (layerset_buffer->mUploadID.isNull())
                        {
                                // The upload got canceled, we should be in the process of baking a new texture
                                // so request an upload with the new data
                                layerset_buffer->requestUpload();
                        }
                        else if( baked_upload_data->mID == layerset_buffer->mUploadID )
                        {
                                // This is the upload we're currently waiting for.
                                layerset_buffer->mUploadID.setNull();

                                if( result >= 0 )
                                {
                                        LLVOAvatar::ETextureIndex baked_te = avatar->getBakedTE( layerset_buffer->mTexLayerSet );
                                        if( !gAgent.cameraCustomizeAvatar() )
                                        {
                                                avatar->setNewBakedTexture( baked_te, uuid );
                                        }
                                        else
                                        {
                                                llinfos << "LLTexLayerSetBuffer::onTextureUploadComplete() when in Customize Avatar" << llendl;
                                        }
                                }
                                else
                                {
                                        llinfos << "Baked upload failed. Reason: " << result << llendl;
                                        // *FIX: retry upload after n seconds, asset server could be busy
                                }
                        }
                        else
                        {
                                llinfos << "Received baked texture out of date, ignored." << llendl;
                        }

                        avatar->dirtyMesh();
                }
        }
        else
        {
                // Baked texture failed to upload, but since we didn't set the new baked texture, it means that they'll
                // try and rebake it at some point in the future (after login?)
                llwarns << "Baked upload failed" << llendl;
        }

        delete baked_upload_data;
}


void LLTexLayerSetBuffer::bindTexture()
{
        if( mInitialized )
        {
                LLDynamicTexture::bindTexture();
        }
        else
        {
                gImageList.getImage(IMG_DEFAULT)->bind();
        }
}

void LLTexLayerSetBuffer::bindBumpTexture( U32 stage )
{
        if( mBumpTexName ) 
        {
                LLImageGL::bindExternalTexture(mBumpTexName, stage, GL_TEXTURE_2D); 
        
                if( mLastBindTime != LLImageGL::sLastFrameTime )
                {
                        mLastBindTime = LLImageGL::sLastFrameTime;
                        LLImageGL::updateBoundTexMem(mWidth * mHeight * 4);
                }
        }
        else
        {
                LLImageGL::unbindTexture(stage, GL_TEXTURE_2D);
        }
}


//-----------------------------------------------------------------------------
// LLTexLayerSet
// An ordered set of texture layers that get composited into a single texture.
//-----------------------------------------------------------------------------

LLTexLayerSetInfo::LLTexLayerSetInfo( )
        :
        mBodyRegion( "" ),
        mWidth( 512 ),
        mHeight( 512 ),
        mClearAlpha( TRUE )
{
}

LLTexLayerSetInfo::~LLTexLayerSetInfo( )
{
        std::for_each(mLayerInfoList.begin(), mLayerInfoList.end(), DeletePointer());
}

BOOL LLTexLayerSetInfo::parseXml(LLXmlTreeNode* node)
{
        llassert( node->hasName( "layer_set" ) );
        if( !node->hasName( "layer_set" ) )
        {
                return FALSE;
        }

        // body_region
        static LLStdStringHandle body_region_string = LLXmlTree::addAttributeString("body_region");
        if( !node->getFastAttributeString( body_region_string, mBodyRegion ) )
        {
                llwarns << "<layer_set> is missing body_region attribute" << llendl;
                return FALSE;
        }

        // width, height
        static LLStdStringHandle width_string = LLXmlTree::addAttributeString("width");
        if( !node->getFastAttributeS32( width_string, mWidth ) )
        {
                return FALSE;
        }

        static LLStdStringHandle height_string = LLXmlTree::addAttributeString("height");
        if( !node->getFastAttributeS32( height_string, mHeight ) )
        {
                return FALSE;
        }

        // Optional alpha component to apply after all compositing is complete.
        static LLStdStringHandle alpha_tga_file_string = LLXmlTree::addAttributeString("alpha_tga_file");
        node->getFastAttributeString( alpha_tga_file_string, mStaticAlphaFileName );

        static LLStdStringHandle clear_alpha_string = LLXmlTree::addAttributeString("clear_alpha");
        node->getFastAttributeBOOL( clear_alpha_string, mClearAlpha );

        // <layer>
        for (LLXmlTreeNode* child = node->getChildByName( "layer" );
                 child;
                 child = node->getNextNamedChild())
        {
                LLTexLayerInfo* info = new LLTexLayerInfo();
                if( !info->parseXml( child ))
                {
                        delete info;
                        return FALSE;
                }
                mLayerInfoList.push_back( info );               
        }
        return TRUE;
}

//-----------------------------------------------------------------------------
// LLTexLayerSet
// An ordered set of texture layers that get composited into a single texture.
//-----------------------------------------------------------------------------

BOOL LLTexLayerSet::sHasCaches = FALSE;

LLTexLayerSet::LLTexLayerSet( LLVOAvatar* avatar )
        :
        mComposite( NULL ),
        mAvatar( avatar ),
        mUpdatesEnabled( FALSE ),
        mHasBump( FALSE ),
        mInfo( NULL )
{
}

LLTexLayerSet::~LLTexLayerSet()
{
        std::for_each(mLayerList.begin(), mLayerList.end(), DeletePointer());
        delete mComposite;
}

//-----------------------------------------------------------------------------
// setInfo
//-----------------------------------------------------------------------------

BOOL LLTexLayerSet::setInfo(LLTexLayerSetInfo *info)
{
        llassert(mInfo == NULL);
        mInfo = info;
        //mID = info->mID; // No ID

        LLTexLayerSetInfo::layer_info_list_t::iterator iter;
        mLayerList.reserve(info->mLayerInfoList.size());
        for (iter = info->mLayerInfoList.begin(); iter != info->mLayerInfoList.end(); iter++)
        {
                LLTexLayer* layer = new LLTexLayer( this );
                if (!layer->setInfo(*iter))
                {
                        mInfo = NULL;
                        return FALSE;
                }
                mLayerList.push_back( layer );
        }

        requestUpdate();

        stop_glerror();

        return TRUE;
}

#if 0 // obsolete
//-----------------------------------------------------------------------------
// parseData
//-----------------------------------------------------------------------------

BOOL LLTexLayerSet::parseData(LLXmlTreeNode* node)
{
        LLTexLayerSetInfo *info = new LLTexLayerSetInfo;

        if (!info->parseXml(node))
        {
                delete info;
                return FALSE;
        }
        if (!setInfo(info))
        {
                delete info;
                return FALSE;
        }
        return TRUE;
}
#endif

void LLTexLayerSet::deleteCaches()
{
        for( layer_list_t::iterator iter = mLayerList.begin(); iter != mLayerList.end(); iter++ )
        {
                LLTexLayer* layer = *iter;
                layer->deleteCaches();
        }
}

// Returns TRUE if at least one packet of data has been received for each of the textures that this layerset depends on.
BOOL LLTexLayerSet::isLocalTextureDataAvailable()
{
        return mAvatar->isLocalTextureDataAvailable( this );
}


// Returns TRUE if all of the data for the textures that this layerset depends on have arrived.
BOOL LLTexLayerSet::isLocalTextureDataFinal()
{
        return mAvatar->isLocalTextureDataFinal( this );
}


BOOL LLTexLayerSet::render( S32 x, S32 y, S32 width, S32 height )
{
        BOOL success = TRUE;

        LLGLSUIDefault gls_ui;
        LLGLDepthTest gls_depth(GL_FALSE, GL_FALSE);

        // composite color layers
        for( layer_list_t::iterator iter = mLayerList.begin(); iter != mLayerList.end(); iter++ )
        {
                LLTexLayer* layer = *iter;
                if( layer->getRenderPass() == RP_COLOR )
                {
                        gGL.flush();
                        success &= layer->render( x, y, width, height );
                        gGL.flush();
                }
        }

        // (Optionally) replace alpha with a single component image from a tga file.
        if( !getInfo()->mStaticAlphaFileName.empty() )
        {
                LLGLSNoAlphaTest gls_no_alpha_test;
                gGL.flush();
                glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE );
                gGL.blendFunc( GL_ONE, GL_ZERO );

                {
                        LLImageGL* image_gl = gTexStaticImageList.getImageGL( getInfo()->mStaticAlphaFileName, TRUE );
                        if( image_gl )
                        {
                                LLGLSUIDefault gls_ui;
                                image_gl->bind();
                                gl_rect_2d_simple_tex( width, height );
                        }
                        else
                        {
                                success = FALSE;
                        }
                }
                LLImageGL::unbindTexture(0, GL_TEXTURE_2D);

                gGL.flush();
                glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
                gGL.blendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
        }
        else 
        if( getInfo()->mClearAlpha )
        {
                // Set the alpha channel to one (clean up after previous blending)
                LLGLSNoTextureNoAlphaTest gls_no_alpha;
                gGL.color4f( 0.f, 0.f, 0.f, 1.f );
                gGL.flush();
                glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE );

                gl_rect_2d_simple( width, height );
                
                gGL.flush();
                glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
        }
        stop_glerror();

        return success;
}

BOOL LLTexLayerSet::renderBump( S32 x, S32 y, S32 width, S32 height )
{
        BOOL success = TRUE;

        LLGLSUIDefault gls_ui;
        LLGLDepthTest gls_depth(GL_FALSE, GL_FALSE);

        //static S32 bump_layer_count = 1;

        for( layer_list_t::iterator iter = mLayerList.begin(); iter != mLayerList.end(); iter++ )
        {
                LLTexLayer* layer = *iter;
                if( layer->getRenderPass() == RP_BUMP )
                {
                        success &= layer->render( x, y, width, height );
                }
        }

        // Set the alpha channel to one (clean up after previous blending)
        LLGLSNoTextureNoAlphaTest gls_no_texture_no_alpha;
        gGL.color4f( 0.f, 0.f, 0.f, 1.f );
        glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE );

        gl_rect_2d_simple( width, height );
        
        glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
        stop_glerror();

        return success;
}

void LLTexLayerSet::requestUpdate()
{
        if( mUpdatesEnabled )
        {
                createComposite();
                mComposite->requestUpdate(); 
        }
}

void LLTexLayerSet::requestUpload()
{
        createComposite();
        mComposite->requestUpload();
}

void LLTexLayerSet::cancelUpload()
{
        if(mComposite)
        {
                mComposite->cancelUpload();
        }
}

void LLTexLayerSet::createComposite()
{
        if( !mComposite )
        {
                S32 width = mInfo->mWidth;
                S32 height = mInfo->mHeight;
                // Composite other avatars at reduced resolution
                if( !mAvatar->mIsSelf )
                {
                        width /= 2;
                        height /= 2;
                }
                mComposite = new LLTexLayerSetBuffer( this, width, height, mHasBump );
        }
}

void LLTexLayerSet::destroyComposite()
{
        if( mComposite )
        {
                delete mComposite;
                mComposite = NULL;
        }
}

void LLTexLayerSet::setUpdatesEnabled( BOOL b )
{
        mUpdatesEnabled = b; 
}


void LLTexLayerSet::updateComposite()
{
        createComposite();
        mComposite->updateImmediate();
}

LLTexLayerSetBuffer* LLTexLayerSet::getComposite()
{
        createComposite();
        return mComposite;
}

void LLTexLayerSet::gatherAlphaMasks(U8 *data, S32 width, S32 height)
{
        S32 size = width * height;

        memset(data, 255, width * height);

        for( layer_list_t::iterator iter = mLayerList.begin(); iter != mLayerList.end(); iter++ )
        {
                LLTexLayer* layer = *iter;
                U8* alphaData = layer->getAlphaData();
                if (!alphaData && layer->hasAlphaParams())
                {
                        LLColor4 net_color;
                        layer->findNetColor( &net_color );
                        layer->invalidateMorphMasks();
                        layer->renderAlphaMasks(mComposite->getOriginX(), mComposite->getOriginY(), width, height, &net_color);
                        alphaData = layer->getAlphaData();
                }
                if (alphaData)
                {
                        for( S32 i = 0; i < size; i++ )
                        {
                                U8 curAlpha = data[i];
                                U16 resultAlpha = curAlpha;
                                resultAlpha *= (alphaData[i] + 1);
                                resultAlpha = resultAlpha >> 8;
                                data[i] = (U8)resultAlpha;
                        }
                }
        }
}

void LLTexLayerSet::applyMorphMask(U8* tex_data, S32 width, S32 height, S32 num_components)
{
        for( layer_list_t::iterator iter = mLayerList.begin(); iter != mLayerList.end(); iter++ )
        {
                LLTexLayer* layer = *iter;
                layer->applyMorphMask(tex_data, width, height, num_components);
        }
}

//-----------------------------------------------------------------------------
// LLTexLayerInfo
//-----------------------------------------------------------------------------
LLTexLayerInfo::LLTexLayerInfo( )
        :
        mWriteAllChannels( FALSE ),
        mRenderPass( RP_COLOR ),
        mFixedColor( 0.f, 0.f, 0.f, 0.f ),
        mLocalTexture( -1 ),
        mStaticImageIsMask( FALSE ),
        mUseLocalTextureAlphaOnly( FALSE )
{
}

LLTexLayerInfo::~LLTexLayerInfo( )
{
        std::for_each(mColorInfoList.begin(), mColorInfoList.end(), DeletePointer());
        std::for_each(mAlphaInfoList.begin(), mAlphaInfoList.end(), DeletePointer());
}

BOOL LLTexLayerInfo::parseXml(LLXmlTreeNode* node)
{
        llassert( node->hasName( "layer" ) );

        // name attribute
        static LLStdStringHandle name_string = LLXmlTree::addAttributeString("name");
        if( !node->getFastAttributeString( name_string, mName ) )
        {
                return FALSE;
        }
        
        static LLStdStringHandle write_all_channels_string = LLXmlTree::addAttributeString("write_all_channels");
        node->getFastAttributeBOOL( write_all_channels_string, mWriteAllChannels );

        LLString render_pass_name;
        static LLStdStringHandle render_pass_string = LLXmlTree::addAttributeString("render_pass");
        if( node->getFastAttributeString( render_pass_string, render_pass_name ) )
        {
                if( render_pass_name == "bump" )
                {
                        mRenderPass = RP_BUMP;
                }
        }

        // Note: layers can have either a "global_color" attrib, a "fixed_color" attrib, or a <param_color> child.
        // global color attribute (optional)
        static LLStdStringHandle global_color_string = LLXmlTree::addAttributeString("global_color");
        node->getFastAttributeString( global_color_string, mGlobalColor );

        // color attribute (optional)
        LLColor4U color4u;
        static LLStdStringHandle fixed_color_string = LLXmlTree::addAttributeString("fixed_color");
        if( node->getFastAttributeColor4U( fixed_color_string, color4u ) )
        {
                mFixedColor.setVec( color4u );
        }

                // <texture> optional sub-element
        for (LLXmlTreeNode* texture_node = node->getChildByName( "texture" );
                 texture_node;
                 texture_node = node->getNextNamedChild())
        {
                LLString local_texture;
                static LLStdStringHandle tga_file_string = LLXmlTree::addAttributeString("tga_file");
                static LLStdStringHandle local_texture_string = LLXmlTree::addAttributeString("local_texture");
                static LLStdStringHandle file_is_mask_string = LLXmlTree::addAttributeString("file_is_mask");
                static LLStdStringHandle local_texture_alpha_only_string = LLXmlTree::addAttributeString("local_texture_alpha_only");
                if( texture_node->getFastAttributeString( tga_file_string, mStaticImageFileName ) )
                {
                        texture_node->getFastAttributeBOOL( file_is_mask_string, mStaticImageIsMask );
                }
                else if( texture_node->getFastAttributeString( local_texture_string, local_texture ) )
                {
                        texture_node->getFastAttributeBOOL( local_texture_alpha_only_string, mUseLocalTextureAlphaOnly );

                        if( "upper_shirt" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_UPPER_SHIRT;
                        }
                        else if( "upper_bodypaint" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_UPPER_BODYPAINT;
                        }
                        else if( "lower_pants" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_LOWER_PANTS;
                        }
                        else if( "lower_bodypaint" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_LOWER_BODYPAINT;
                        }
                        else if( "lower_shoes" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_LOWER_SHOES;
                        }
                        else if( "head_bodypaint" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_HEAD_BODYPAINT;
                        }
                        else if( "lower_socks" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_LOWER_SOCKS;
                        }
                        else if( "upper_jacket" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_UPPER_JACKET;
                        }
                        else if( "lower_jacket" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_LOWER_JACKET;
                        }
                        else if( "upper_gloves" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_UPPER_GLOVES;
                        }
                        else if( "upper_undershirt" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_UPPER_UNDERSHIRT;
                        }
                        else if( "lower_underpants" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_LOWER_UNDERPANTS;
                        }
                        else if( "eyes_iris" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_EYES_IRIS;
                        }
                        else if( "skirt" == local_texture )
                        {
                                mLocalTexture = LLVOAvatar::LOCTEX_SKIRT;
                        }
                        else
                        {
                                llwarns << "<texture> element has invalid local_texure attribute: " << mName << " " << local_texture << llendl;
                                return FALSE;
                        }
                }
                else    
                {
                        llwarns << "<texture> element is missing a required attribute. " << mName << llendl;
                        return FALSE;
                }
        }

        for (LLXmlTreeNode* maskNode = node->getChildByName( "morph_mask" );
                 maskNode;
                 maskNode = node->getNextNamedChild())
        {
                LLString morph_name;
                static LLStdStringHandle morph_name_string = LLXmlTree::addAttributeString("morph_name");
                if (maskNode->getFastAttributeString(morph_name_string, morph_name))
                {
                        BOOL invert = FALSE;
                        static LLStdStringHandle invert_string = LLXmlTree::addAttributeString("invert");
                        maskNode->getFastAttributeBOOL(invert_string, invert);                  
                        mMorphNameList.push_back(std::pair<LLString,BOOL>(morph_name,invert));
                }
        }

        // <param> optional sub-element (color or alpha params)
        for (LLXmlTreeNode* child = node->getChildByName( "param" );
                 child;
                 child = node->getNextNamedChild())
        {
                if( child->getChildByName( "param_color" ) )
                {
                        // <param><param_color/></param>
                        LLTexParamColorInfo* info = new LLTexParamColorInfo( );
                        if (!info->parseXml(child))
                        {
                                delete info;
                                return FALSE;
                        }
                        mColorInfoList.push_back( info );
                }
                else if( child->getChildByName( "param_alpha" ) )
                {
                        // <param><param_alpha/></param>
                        LLTexLayerParamAlphaInfo* info = new LLTexLayerParamAlphaInfo( );
                        if (!info->parseXml(child))
                        {
                                delete info;
                                return FALSE;
                        }
                        mAlphaInfoList.push_back( info );
                }
        }
        
        return TRUE;
}

//-----------------------------------------------------------------------------
// LLTexLayer
// A single texture layer, consisting of:
//              * color, consisting of either
//                      * one or more color parameters (weighted colors)
//                      * a reference to a global color
//                      * a fixed color with non-zero alpha
//                      * opaque white (the default)
//              * (optional) a texture defined by either
//                      * a GUID
//                      * a texture entry index (TE)
//              * (optional) one or more alpha parameters (weighted alpha textures)
//-----------------------------------------------------------------------------
LLTexLayer::LLTexLayer( LLTexLayerSet* layer_set )
        :
        mTexLayerSet( layer_set ),
        mMorphMasksValid( FALSE ),
        mStaticImageInvalid( FALSE ),
        mInfo( NULL )
{
}

LLTexLayer::~LLTexLayer()
{
        // mParamAlphaList and mParamColorList are LLViewerVisualParam's and get
        // deleted with ~LLCharacter()
        //std::for_each(mParamAlphaList.begin(), mParamAlphaList.end(), DeletePointer());
        //std::for_each(mParamColorList.begin(), mParamColorList.end(), DeletePointer());
        
        for( alpha_cache_t::iterator iter = mAlphaCache.begin();
                 iter != mAlphaCache.end(); iter++ )
        {
                U8* alpha_data = iter->second;
                delete [] alpha_data;
        }
}

//-----------------------------------------------------------------------------
// setInfo
//-----------------------------------------------------------------------------

BOOL LLTexLayer::setInfo(LLTexLayerInfo* info)
{
        llassert(mInfo == NULL);
        mInfo = info;
        //mID = info->mID; // No ID

        if (info->mRenderPass == RP_BUMP)
                mTexLayerSet->setBump(TRUE);

        {
                LLTexLayerInfo::morph_name_list_t::iterator iter;
                for (iter = mInfo->mMorphNameList.begin(); iter != mInfo->mMorphNameList.end(); iter++)
                {
                        // *FIX: we assume that the referenced visual param is a
                        // morph target, need a better way of actually looking
                        // this up.
                        LLPolyMorphTarget *morph_param;
                        LLString *name = &(iter->first);
                        morph_param = (LLPolyMorphTarget *)(getTexLayerSet()->getAvatar()->getVisualParam(name->c_str()));
                        if (morph_param)
                        {
                                BOOL invert = iter->second;
                                addMaskedMorph(morph_param, invert);
                        }
                }
        }

        {
                LLTexLayerInfo::color_info_list_t::iterator iter;
                mParamColorList.reserve(mInfo->mColorInfoList.size());
                for (iter = mInfo->mColorInfoList.begin(); iter != mInfo->mColorInfoList.end(); iter++)
                {
                        LLTexParamColor* param_color = new LLTexParamColor( this );
                        if (!param_color->setInfo(*iter))
                        {
                                mInfo = NULL;
                                return FALSE;
                        }
                        mParamColorList.push_back( param_color );
                }
        }
        {
                LLTexLayerInfo::alpha_info_list_t::iterator iter;
                mParamAlphaList.reserve(mInfo->mAlphaInfoList.size());
                for (iter = mInfo->mAlphaInfoList.begin(); iter != mInfo->mAlphaInfoList.end(); iter++)
                {
                        LLTexLayerParamAlpha* param_alpha = new LLTexLayerParamAlpha( this );
                        if (!param_alpha->setInfo(*iter))
                        {
                                mInfo = NULL;
                                return FALSE;
                        }
                        mParamAlphaList.push_back( param_alpha );
                }
        }
        
        return TRUE;
}

#if 0 // obsolete
//-----------------------------------------------------------------------------
// parseData
//-----------------------------------------------------------------------------
BOOL LLTexLayer::parseData( LLXmlTreeNode* node )
{
        LLTexLayerInfo *info = new LLTexLayerInfo;

        if (!info->parseXml(node))
        {
                delete info;
                return FALSE;
        }
        if (!setInfo(info))
        {
                delete info;
                return FALSE;
        }
        return TRUE;
}
#endif

//-----------------------------------------------------------------------------


void LLTexLayer::deleteCaches()
{
        for( alpha_list_t::iterator iter = mParamAlphaList.begin();
                 iter != mParamAlphaList.end(); iter++ )
        {
                LLTexLayerParamAlpha* param = *iter;
                param->deleteCaches();
        }
        mStaticImageRaw = NULL;
}

BOOL LLTexLayer::render( S32 x, S32 y, S32 width, S32 height )
{
        LLGLEnable color_mat(GL_COLOR_MATERIAL);
        gPipeline.disableLights();

        BOOL success = TRUE;
        
        BOOL color_specified = FALSE;
        BOOL alpha_mask_specified = FALSE;

        LLColor4 net_color;
        color_specified = findNetColor( &net_color );

        // If you can't see the layer, don't render it.
        if( is_approx_zero( net_color.mV[VW] ) )
        {
                return success;
        }

        alpha_list_t::iterator iter = mParamAlphaList.begin();
        if( iter != mParamAlphaList.end() )
        {
                // If we have alpha masks, but we're skipping all of them, skip the whole layer.
                // However, we can't do this optimization if we have morph masks that need updating.
                if( mMaskedMorphs.empty() )
                {
                        BOOL skip_layer = TRUE;

                        while( iter != mParamAlphaList.end() )
                        {
                                LLTexLayerParamAlpha* param = *iter;
                
                                if( !param->getSkip() )
                                {
                                        skip_layer = FALSE;
                                        break;
                                }

                                iter++;
                        } 

                        if( skip_layer )
                        {
                                return success;
                        }
                }

                renderAlphaMasks( x, y, width, height, &net_color );
                alpha_mask_specified = TRUE;
                gGL.flush();
                gGL.blendFunc( GL_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA );
        }

        gGL.color4fv( net_color.mV);

        if( getInfo()->mWriteAllChannels )
        {
                gGL.flush();
                gGL.blendFunc( GL_ONE, GL_ZERO );
        }

        if( (getInfo()->mLocalTexture != -1) && !getInfo()->mUseLocalTextureAlphaOnly )
        {
                {
                        LLImageGL* image_gl = NULL;
                        if( mTexLayerSet->getAvatar()->getLocalTextureGL( getInfo()->mLocalTexture, &image_gl ) )
                        {
                                if( image_gl )
                                {
                                        LLGLDisable alpha_test(getInfo()->mWriteAllChannels ? GL_ALPHA_TEST : 0);

                                        BOOL old_clamps = image_gl->getClampS();
                                        BOOL old_clampt = image_gl->getClampT();
                                        
                                        image_gl->bind();
                                        image_gl->setClamp(TRUE, TRUE);

                                        gl_rect_2d_simple_tex( width, height );

                                        image_gl->setClamp(old_clamps, old_clampt);
                                        image_gl->unbindTexture(0, GL_TEXTURE_2D);
                                }
                        }
                        else
                        {
                                success = FALSE;
                        }
                }
        }

        if( !getInfo()->mStaticImageFileName.empty() )
        {
                {
                        LLImageGL* image_gl = gTexStaticImageList.getImageGL( getInfo()->mStaticImageFileName, getInfo()->mStaticImageIsMask );
                        if( image_gl )
                        {
                                image_gl->bind();
                                gl_rect_2d_simple_tex( width, height );
                                image_gl->unbindTexture(0, GL_TEXTURE_2D);
                        }
                        else
                        {
                                success = FALSE;
                        }
                }
        }

        if( ((-1 == getInfo()->mLocalTexture) ||
                 getInfo()->mUseLocalTextureAlphaOnly) &&
                getInfo()->mStaticImageFileName.empty() &&
                color_specified )
        {
                LLGLSNoTextureNoAlphaTest gls;
                gGL.color4fv( net_color.mV);
                gl_rect_2d_simple( width, height );
        }

        if( alpha_mask_specified || getInfo()->mWriteAllChannels )
        {
                // Restore standard blend func value
                gGL.flush();
                gGL.blendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
                stop_glerror();
        }

        if( !success )
        {
                llinfos << "LLTexLayer::render() partial: " << getInfo()->mName << llendl;
        }
        return success;
}

U8*     LLTexLayer::getAlphaData()
{
        LLCRC alpha_mask_crc;
        const LLUUID& uuid = mTexLayerSet->getAvatar()->getLocalTextureID(getInfo()->mLocalTexture);
        alpha_mask_crc.update((U8*)(&uuid.mData), UUID_BYTES);

        for( alpha_list_t::iterator iter = mParamAlphaList.begin(); iter != mParamAlphaList.end(); iter++ )
        {
                LLTexLayerParamAlpha* param = *iter;
                F32 param_weight = param->getWeight();
                alpha_mask_crc.update((U8*)&param_weight, sizeof(F32));
        }

        U32 cache_index = alpha_mask_crc.getCRC();

        alpha_cache_t::iterator iter2 = mAlphaCache.find(cache_index);
        return (iter2 == mAlphaCache.end()) ? 0 : iter2->second;
}

BOOL LLTexLayer::findNetColor( LLColor4* net_color )
{
        // Color is either:
        //      * one or more color parameters (weighted colors)  (which may make use of a global color or fixed color)
        //      * a reference to a global color
        //      * a fixed color with non-zero alpha
        //      * opaque white (the default)

        if( !mParamColorList.empty() )
        {
                if( !getGlobalColor().empty() )
                {
                        net_color->setVec( mTexLayerSet->getAvatar()->getGlobalColor( getInfo()->mGlobalColor ) );
                }
                else
                if( getInfo()->mFixedColor.mV[VW] )
                {
                        net_color->setVec( getInfo()->mFixedColor );
                }
                else
                {
                        net_color->setVec( 0.f, 0.f, 0.f, 0.f );
                }
                
                for( color_list_t::iterator iter = mParamColorList.begin();
                         iter != mParamColorList.end(); iter++ )
                {
                        LLTexParamColor* param = *iter;
                        LLColor4 param_net = param->getNetColor();
                        switch( param->getOperation() )
                        {
                        case OP_ADD:
                                *net_color += param_net;
                                break;
                        case OP_MULTIPLY:
                                net_color->mV[VX] *= param_net.mV[VX];
                                net_color->mV[VY] *= param_net.mV[VY];
                                net_color->mV[VZ] *= param_net.mV[VZ];
                                net_color->mV[VW] *= param_net.mV[VW];
                                break;
                        case OP_BLEND:
                                net_color->setVec( lerp(*net_color, param_net, param->getWeight()) );
                                break;
                        default:
                                llassert(0);
                                break;
                        }
                }
                return TRUE;
        }

        if( !getGlobalColor().empty() )
        {
                net_color->setVec( mTexLayerSet->getAvatar()->getGlobalColor( getGlobalColor() ) );
                return TRUE;
        }

        if( getInfo()->mFixedColor.mV[VW] )
        {
                net_color->setVec( getInfo()->mFixedColor );
                return TRUE;
        }

        net_color->setToWhite();

        return FALSE; // No need to draw a separate colored polygon
}


BOOL LLTexLayer::renderAlphaMasks( S32 x, S32 y, S32 width, S32 height, LLColor4* colorp )
{
        BOOL success = TRUE;

        llassert( !mParamAlphaList.empty() );

        glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE );

        alpha_list_t::iterator iter = mParamAlphaList.begin();
        LLTexLayerParamAlpha* first_param = *iter;

        // Note: if the first param is a mulitply, multiply against the current buffer's alpha
        if( !first_param || !first_param->getMultiplyBlend() )
        {
                LLGLSNoTextureNoAlphaTest gls_no_texture_no_alpha_test;
        
                // Clear the alpha
                gGL.flush();
                gGL.blendFunc( GL_ONE, GL_ZERO );

                gGL.color4f( 0.f, 0.f, 0.f, 0.f );
                gl_rect_2d_simple( width, height );
        }

        // Accumulate alphas
        LLGLSNoAlphaTest gls_no_alpha_test;
        gGL.color4f( 1.f, 1.f, 1.f, 1.f );

        for( iter = mParamAlphaList.begin(); iter != mParamAlphaList.end(); iter++ )
        {
                LLTexLayerParamAlpha* param = *iter;
                success &= param->render( x, y, width, height );
        }

        // Approximates a min() function
        gGL.flush();
        gGL.blendFunc( GL_DST_ALPHA, GL_ZERO );

        // Accumulate the alpha component of the texture
        if( getInfo()->mLocalTexture != -1 )
        {
                {
                        LLImageGL* image_gl = NULL;
                        if( mTexLayerSet->getAvatar()->getLocalTextureGL( getInfo()->mLocalTexture, &image_gl ) )
                        {
                                if( image_gl && (image_gl->getComponents() == 4) )
                                {
                                        LLGLSNoAlphaTest gls_no_alpha_test;

                                        BOOL old_clamps = image_gl->getClampS();
                                        BOOL old_clampt = image_gl->getClampT();                                        
                                        image_gl->bind();
                                        image_gl->setClamp(TRUE, TRUE);

                                        gl_rect_2d_simple_tex( width, height );

                                        image_gl->setClamp(old_clamps, old_clampt);
                                        image_gl->unbindTexture(0, GL_TEXTURE_2D);
                                }
                        }
                        else
                        {
                                success = FALSE;
                        }
                }
        }

        if( !getInfo()->mStaticImageFileName.empty() )
        {
                {
                        LLImageGL* image_gl = gTexStaticImageList.getImageGL( getInfo()->mStaticImageFileName, getInfo()->mStaticImageIsMask );
                        if( image_gl )
                        {
                                if(     (image_gl->getComponents() == 4) ||
                                        ( (image_gl->getComponents() == 1) && getInfo()->mStaticImageIsMask ) )
                                {
                                        LLGLSNoAlphaTest gls_no_alpha_test;
                                        image_gl->bind();
                                        gl_rect_2d_simple_tex( width, height );
                                        image_gl->unbindTexture(0, GL_TEXTURE_2D);
                                }
                        }
                        else
                        {
                                success = FALSE;
                        }
                }
        }

        // Draw a rectangle with the layer color to multiply the alpha by that color's alpha.
        // Note: we're still using gGL.blendFunc( GL_DST_ALPHA, GL_ZERO );
        if( colorp->mV[VW] != 1.f )
        {
                LLGLSNoTextureNoAlphaTest gls_no_texture_no_alpha_test;
                gGL.color4fv( colorp->mV );
                gl_rect_2d_simple( width, height );
        }


        LLGLSUIDefault gls_ui;

        glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
        
        if (!mMorphMasksValid && !mMaskedMorphs.empty())
        {
                LLCRC alpha_mask_crc;
                const LLUUID& uuid = mTexLayerSet->getAvatar()->getLocalTextureID(getInfo()->mLocalTexture);
                alpha_mask_crc.update((U8*)(&uuid.mData), UUID_BYTES);
                
                for( alpha_list_t::iterator iter = mParamAlphaList.begin(); iter != mParamAlphaList.end(); iter++ )
                {
                        LLTexLayerParamAlpha* param = *iter;
                        F32 param_weight = param->getWeight();
                        alpha_mask_crc.update((U8*)&param_weight, sizeof(F32));
                }

                U32 cache_index = alpha_mask_crc.getCRC();

                alpha_cache_t::iterator iter2 = mAlphaCache.find(cache_index);
                U8* alpha_data;
                if (iter2 != mAlphaCache.end())
                {
                        alpha_data = iter2->second;
                }
                else
                {
                        // clear out a slot if we have filled our cache
                        S32 max_cache_entries = getTexLayerSet()->getAvatar()->mIsSelf ? 4 : 1;
                        while ((S32)mAlphaCache.size() >= max_cache_entries)
                        {
                                iter2 = mAlphaCache.begin(); // arbitrarily grab the first entry
                                alpha_data = iter2->second;
                                delete [] alpha_data;
                                mAlphaCache.erase(iter2);
                        }
                        alpha_data = new U8[width * height];
                        mAlphaCache[cache_index] = alpha_data;
                        glReadPixels(x, y, width, height, GL_ALPHA, GL_UNSIGNED_BYTE, alpha_data);
                }
                
                getTexLayerSet()->getAvatar()->dirtyMesh();

                mMorphMasksValid = TRUE;

                for( morph_list_t::iterator iter3 = mMaskedMorphs.begin();
                         iter3 != mMaskedMorphs.end(); iter3++ )
                {
                        LLMaskedMorph* maskedMorph = &(*iter3);
                        maskedMorph->mMorphTarget->applyMask(alpha_data, width, height, 1, maskedMorph->mInvert);
                }
        }

        return success;
}

void LLTexLayer::applyMorphMask(U8* tex_data, S32 width, S32 height, S32 num_components)
{
        for( morph_list_t::iterator iter = mMaskedMorphs.begin();
                 iter != mMaskedMorphs.end(); iter++ )
        {
                LLMaskedMorph* maskedMorph = &(*iter);
                maskedMorph->mMorphTarget->applyMask(tex_data, width, height, num_components, maskedMorph->mInvert);
        }
}

// Returns TRUE on success.
BOOL LLTexLayer::renderImageRaw( U8* in_data, S32 in_width, S32 in_height, S32 in_components, S32 width, S32 height, BOOL is_mask )
{
        if (!in_data)
        {
                return FALSE;
        }
        GLenum format_options[4] = { GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_RGB, GL_RGBA };
        GLenum format = format_options[in_components-1];
        if( is_mask )
        {
                llassert( 1 == in_components );
                format = GL_ALPHA;
        }

        if( (in_width != VOAVATAR_SCRATCH_TEX_WIDTH) || (in_height != VOAVATAR_SCRATCH_TEX_HEIGHT) )
        {
                LLGLSNoAlphaTest gls_no_alpha_test;

                GLenum internal_format_options[4] = { GL_LUMINANCE8, GL_LUMINANCE8_ALPHA8, GL_RGB8, GL_RGBA8 };
                GLenum internal_format = internal_format_options[in_components-1];
                if( is_mask )
                {
                        llassert( 1 == in_components );
                        internal_format = GL_ALPHA8;
                }
                
                GLuint name = 0;
                glGenTextures(1, &name );
                stop_glerror();

                LLImageGL::bindExternalTexture( name, 0, GL_TEXTURE_2D ); 
                stop_glerror();

                glTexImage2D(
                        GL_TEXTURE_2D, 0, internal_format, 
                        in_width, in_height,
                        0, format, GL_UNSIGNED_BYTE, in_data );
                stop_glerror();

                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

                gl_rect_2d_simple_tex( width, height );

                LLImageGL::unbindTexture(0, GL_TEXTURE_2D);

                glDeleteTextures(1, &name );
                stop_glerror();
        }
        else
        {
                LLGLSNoAlphaTest gls_no_alpha_test;

                if( !mTexLayerSet->getAvatar()->bindScratchTexture(format) )
                {
                        return FALSE;
                }

                glTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0, in_width, in_height, format, GL_UNSIGNED_BYTE, in_data );
                stop_glerror();

                gl_rect_2d_simple_tex( width, height );

                LLImageGL::unbindTexture(0, GL_TEXTURE_2D);
        }

        return TRUE;
}

void LLTexLayer::requestUpdate()
{
        mTexLayerSet->requestUpdate();
}

void LLTexLayer::addMaskedMorph(LLPolyMorphTarget* morph_target, BOOL invert)
{ 
        mMaskedMorphs.push_front(LLMaskedMorph(morph_target, invert));
}

void LLTexLayer::invalidateMorphMasks()
{
        mMorphMasksValid = FALSE;
}

//-----------------------------------------------------------------------------
// LLTexLayerParamAlphaInfo
//-----------------------------------------------------------------------------
LLTexLayerParamAlphaInfo::LLTexLayerParamAlphaInfo( )
        :
        mMultiplyBlend( FALSE ),
        mSkipIfZeroWeight( FALSE ),
        mDomain( 0.f )
{
}

BOOL LLTexLayerParamAlphaInfo::parseXml(LLXmlTreeNode* node)
{
        llassert( node->hasName( "param" ) && node->getChildByName( "param_alpha" ) );

        if( !LLViewerVisualParamInfo::parseXml(node) )
                return FALSE;

        LLXmlTreeNode* param_alpha_node = node->getChildByName( "param_alpha" );
        if( !param_alpha_node )
        {
                return FALSE;
        }

        static LLStdStringHandle tga_file_string = LLXmlTree::addAttributeString("tga_file");
        if( param_alpha_node->getFastAttributeString( tga_file_string, mStaticImageFileName ) )
        {
                // Don't load the image file until it's actually needed.
        }
//      else
//      {
//              llwarns << "<param_alpha> element is missing tga_file attribute." << llendl;
//      }
        
        static LLStdStringHandle multiply_blend_string = LLXmlTree::addAttributeString("multiply_blend");
        param_alpha_node->getFastAttributeBOOL( multiply_blend_string, mMultiplyBlend );

        static LLStdStringHandle skip_if_zero_string = LLXmlTree::addAttributeString("skip_if_zero");
        param_alpha_node->getFastAttributeBOOL( skip_if_zero_string, mSkipIfZeroWeight );

        static LLStdStringHandle domain_string = LLXmlTree::addAttributeString("domain");
        param_alpha_node->getFastAttributeF32( domain_string, mDomain );

        gGradientPaletteList.initPalette(mDomain);

        return TRUE;
}

//-----------------------------------------------------------------------------
// LLTexLayerParamAlpha
//-----------------------------------------------------------------------------

// static 
LLTexLayerParamAlpha::param_alpha_ptr_list_t LLTexLayerParamAlpha::sInstances;

// static 
void LLTexLayerParamAlpha::dumpCacheByteCount()
{
        S32 gl_bytes = 0;
        getCacheByteCount( &gl_bytes );
        llinfos << "Processed Alpha Texture Cache GL:" << (gl_bytes/1024) << "KB" << llendl;
}

// static 
void LLTexLayerParamAlpha::getCacheByteCount( S32* gl_bytes )
{
        *gl_bytes = 0;

        for( param_alpha_ptr_list_t::iterator iter = sInstances.begin();
                 iter != sInstances.end(); iter++ )
        {
                LLTexLayerParamAlpha* instance = *iter;
                LLImageGL* image_gl = instance->mCachedProcessedImageGL;
                if( image_gl )
                {
                        S32 bytes = (S32)image_gl->getWidth() * image_gl->getHeight() * image_gl->getComponents();

                        if( image_gl->getHasGLTexture() )
                        {
                                *gl_bytes += bytes;
                        }
                }
        }
}

LLTexLayerParamAlpha::LLTexLayerParamAlpha( LLTexLayer* layer )
        :
        mCachedProcessedImageGL( NULL ),
        mTexLayer( layer ),
        mNeedsCreateTexture( FALSE ),
        mStaticImageInvalid( FALSE ),
        mAvgDistortionVec(1.f, 1.f, 1.f),
        mCachedEffectiveWeight(0.f)
{
        sInstances.push_front( this );
}

LLTexLayerParamAlpha::~LLTexLayerParamAlpha()
{
        deleteCaches();
        sInstances.remove( this );
}

//-----------------------------------------------------------------------------
// setInfo()
//-----------------------------------------------------------------------------
BOOL LLTexLayerParamAlpha::setInfo(LLTexLayerParamAlphaInfo *info)
{
        llassert(mInfo == NULL);
        if (info->mID < 0)
                return FALSE;
        mInfo = info;
        mID = info->mID;

        mTexLayer->getTexLayerSet()->getAvatar()->addVisualParam( this );
        setWeight(getDefaultWeight(), FALSE );
        
        return TRUE;
}

//-----------------------------------------------------------------------------

void LLTexLayerParamAlpha::deleteCaches()
{
        mStaticImageTGA = NULL; // deletes image
        mCachedProcessedImageGL = NULL;
        mStaticImageRaw = NULL;
        mNeedsCreateTexture = FALSE;
}

void LLTexLayerParamAlpha::setWeight(F32 weight, BOOL set_by_user)
{
        if (mIsAnimating)
        {
                return;
        }
        F32 min_weight = getMinWeight();
        F32 max_weight = getMaxWeight();
        F32 new_weight = llclamp(weight, min_weight, max_weight);
        U8 cur_u8 = F32_to_U8( mCurWeight, min_weight, max_weight );
        U8 new_u8 = F32_to_U8( new_weight, min_weight, max_weight );
        if( cur_u8 != new_u8)
        {
                mCurWeight = new_weight;

                LLVOAvatar* avatar = mTexLayer->getTexLayerSet()->getAvatar();
                if( avatar->getSex() & getSex() )
                {
                        avatar->invalidateComposite( mTexLayer->getTexLayerSet(), set_by_user );
                        mTexLayer->invalidateMorphMasks();
                }
        }
}

void LLTexLayerParamAlpha::setAnimationTarget(F32 target_value, BOOL set_by_user)
{ 
        mTargetWeight = target_value; 
        setWeight(target_value, set_by_user); 
        mIsAnimating = TRUE;
        if (mNext)
        {
                mNext->setAnimationTarget(target_value, set_by_user);
        }
}

void LLTexLayerParamAlpha::animate(F32 delta, BOOL set_by_user)
{
        if (mNext)
        {
                mNext->animate(delta, set_by_user);
        }
}

BOOL LLTexLayerParamAlpha::getSkip()
{
        LLVOAvatar *avatar = mTexLayer->getTexLayerSet()->getAvatar();

        if( getInfo()->mSkipIfZeroWeight )
        {
                F32 effective_weight = ( avatar->getSex() & getSex() ) ? mCurWeight : getDefaultWeight();
                if (is_approx_zero( effective_weight )) 
                {
                        return TRUE;
                }
        }

        EWearableType type = (EWearableType)getWearableType();
        if( (type != WT_INVALID) && !avatar->isWearingWearableType( type ) )
        {
                return TRUE;
        }

        return FALSE;
}


BOOL LLTexLayerParamAlpha::render( S32 x, S32 y, S32 width, S32 height )
{
        BOOL success = TRUE;

        F32 effective_weight = ( mTexLayer->getTexLayerSet()->getAvatar()->getSex() & getSex() ) ? mCurWeight : getDefaultWeight();
        BOOL weight_changed = effective_weight != mCachedEffectiveWeight;
        if( getSkip() )
        {
                return success;
        }

        gGL.flush();
        if( getInfo()->mMultiplyBlend )
        {
                gGL.blendFunc( GL_DST_ALPHA, GL_ZERO ); // Multiplication: approximates a min() function
        }
        else
        {
                gGL.blendFunc( GL_ONE, GL_ONE );  // Addition: approximates a max() function
        }

        if( !getInfo()->mStaticImageFileName.empty() && !mStaticImageInvalid)
        {
                if( mStaticImageTGA.isNull() )
                {
                        // Don't load the image file until we actually need it the first time.  Like now.
                        mStaticImageTGA = gTexStaticImageList.getImageTGA( getInfo()->mStaticImageFileName );  
                        // We now have something in one of our caches
                        LLTexLayerSet::sHasCaches |= mStaticImageTGA.notNull() ? TRUE : FALSE;

                        if( mStaticImageTGA.isNull() )
                        {
                                llwarns << "Unable to load static file: " << getInfo()->mStaticImageFileName << llendl;
                                mStaticImageInvalid = TRUE; // don't try again.
                                return FALSE;
                        }
                }

                const S32 image_tga_width = mStaticImageTGA->getWidth();
                const S32 image_tga_height = mStaticImageTGA->getHeight(); 
                if(     !mCachedProcessedImageGL ||
                        (mCachedProcessedImageGL->getWidth() != image_tga_width) ||
                        (mCachedProcessedImageGL->getHeight() != image_tga_height) ||
                        (weight_changed && !(gGLManager.mHasPalettedTextures && gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_PALETTE))) )
                {
//                      llinfos << "Building Cached Alpha: " << mName << ": (" << mStaticImageRaw->getWidth() << ", " << mStaticImageRaw->getHeight() << ") " << effective_weight << llendl;
                        mCachedEffectiveWeight = effective_weight;

                        if( !mCachedProcessedImageGL )
                        {
                                mCachedProcessedImageGL = new LLImageGL( image_tga_width, image_tga_height, 1, FALSE);

                                // We now have something in one of our caches
                                LLTexLayerSet::sHasCaches |= mCachedProcessedImageGL ? TRUE : FALSE;

                                if (gGLManager.mHasPalettedTextures && gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_PALETTE))
                                {
                                        // interpret luminance values as color index table
                                        mCachedProcessedImageGL->setExplicitFormat( GL_COLOR_INDEX8_EXT, GL_COLOR_INDEX ); 
                                }
                                else
                                {
                                        mCachedProcessedImageGL->setExplicitFormat( GL_ALPHA8, GL_ALPHA );
                                }
                        }

                        // Applies domain and effective weight to data as it is decoded. Also resizes the raw image if needed.
                        if (gGLManager.mHasPalettedTextures && gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_PALETTE))
                        {
                                mStaticImageRaw = NULL;
                                mStaticImageRaw = new LLImageRaw;
                                mStaticImageTGA->decode(mStaticImageRaw);
                                mNeedsCreateTexture = TRUE;
                        }
                        else
                        {
                                mStaticImageRaw = NULL;
                                mStaticImageRaw = new LLImageRaw;
                                mStaticImageTGA->decodeAndProcess( mStaticImageRaw, getInfo()->mDomain, effective_weight );
                                mNeedsCreateTexture = TRUE;
                        }
                }

                if( mCachedProcessedImageGL )
                {
                        {
                                if (gGLManager.mHasPalettedTextures && gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_PALETTE))
                                {
                                        if( mNeedsCreateTexture )
                                        {
                                                mCachedProcessedImageGL->createGLTexture(0, mStaticImageRaw);
                                                mNeedsCreateTexture = FALSE;
                                                
                                                mCachedProcessedImageGL->bind();
                                                mCachedProcessedImageGL->setClamp(TRUE, TRUE);
                                        }

                                        LLGLSNoAlphaTest gls_no_alpha_test;
                                        mCachedProcessedImageGL->bind();
                                        gGradientPaletteList.setHardwarePalette( getInfo()->mDomain, effective_weight );
                                        gl_rect_2d_simple_tex( width, height );
                                        mCachedProcessedImageGL->unbindTexture(0, GL_TEXTURE_2D);
                                }
                                else
                                {
                                        // Create the GL texture, and then hang onto it for future use.
                                        if( mNeedsCreateTexture )
                                        {
                                                mCachedProcessedImageGL->createGLTexture(0, mStaticImageRaw);
                                                mNeedsCreateTexture = FALSE;
                                                
                                                mCachedProcessedImageGL->bind();
                                                mCachedProcessedImageGL->setClamp(TRUE, TRUE);
                                        }
                                
                                        LLGLSNoAlphaTest gls_no_alpha_test;
                                        mCachedProcessedImageGL->bind();
                                        gl_rect_2d_simple_tex( width, height );
                                        mCachedProcessedImageGL->unbindTexture(0, GL_TEXTURE_2D);
                                }
                                stop_glerror();
                        }
                }

                // Don't keep the cache for other people's avatars
                // (It's not really a "cache" in that case, but the logic is the same)
                if( !mTexLayer->getTexLayerSet()->getAvatar()->mIsSelf )
                {
                        mCachedProcessedImageGL = NULL;
                }
        }
        else
        {
                LLGLSNoTextureNoAlphaTest gls_no_texture_no_alpha_test;
                gGL.color4f( 0.f, 0.f, 0.f, effective_weight );
                gl_rect_2d_simple( width, height );
        }

        return success;
}

//-----------------------------------------------------------------------------
// LLTexGlobalColorInfo
//-----------------------------------------------------------------------------

LLTexGlobalColorInfo::LLTexGlobalColorInfo()
{
}


LLTexGlobalColorInfo::~LLTexGlobalColorInfo()
{
        for_each(mColorInfoList.begin(), mColorInfoList.end(), DeletePointer());
}

BOOL LLTexGlobalColorInfo::parseXml(LLXmlTreeNode* node)
{
        // name attribute
        static LLStdStringHandle name_string = LLXmlTree::addAttributeString("name");
        if( !node->getFastAttributeString( name_string, mName ) )
        {
                llwarns << "<global_color> element is missing name attribute." << llendl;
                return FALSE;
        }
        // <param> sub-element
        for (LLXmlTreeNode* child = node->getChildByName( "param" );
                 child;
                 child = node->getNextNamedChild())
        {
                if( child->getChildByName( "param_color" ) )
                {
                        // <param><param_color/></param>
                        LLTexParamColorInfo* info = new LLTexParamColorInfo();
                        if (!info->parseXml(child))
                        {
                                delete info;
                                return FALSE;
                        }
                        mColorInfoList.push_back( info );
                }
        }
        return TRUE;
}

//-----------------------------------------------------------------------------
// LLTexGlobalColor
//-----------------------------------------------------------------------------

LLTexGlobalColor::LLTexGlobalColor( LLVOAvatar* avatar )
        :
        mAvatar( avatar ),
        mInfo( NULL )
{
}


LLTexGlobalColor::~LLTexGlobalColor()
{
        // mParamList are LLViewerVisualParam's and get deleted with ~LLCharacter()
        //std::for_each(mParamList.begin(), mParamList.end(), DeletePointer());
}

BOOL LLTexGlobalColor::setInfo(LLTexGlobalColorInfo *info)
{
        llassert(mInfo == NULL);
        mInfo = info;
        //mID = info->mID; // No ID

        LLTexGlobalColorInfo::color_info_list_t::iterator iter;
        mParamList.reserve(mInfo->mColorInfoList.size());
        for (iter = mInfo->mColorInfoList.begin(); iter != mInfo->mColorInfoList.end(); iter++)
        {
                LLTexParamColor* param_color = new LLTexParamColor( this );
                if (!param_color->setInfo(*iter))
                {
                        mInfo = NULL;
                        return FALSE;
                }
                mParamList.push_back( param_color );
        }
        
        return TRUE;
}

//-----------------------------------------------------------------------------

LLColor4 LLTexGlobalColor::getColor()
{
        // Sum of color params
        if( !mParamList.empty() )
        {
                LLColor4 net_color( 0.f, 0.f, 0.f, 0.f );
                
                for( param_list_t::iterator iter = mParamList.begin();
                         iter != mParamList.end(); iter++ )
                {
                        LLTexParamColor* param = *iter;
                        LLColor4 param_net = param->getNetColor();
                        switch( param->getOperation() )
                        {
                        case OP_ADD:
                                net_color += param_net;
                                break;
                        case OP_MULTIPLY:
                                net_color.mV[VX] *= param_net.mV[VX];
                                net_color.mV[VY] *= param_net.mV[VY];
                                net_color.mV[VZ] *= param_net.mV[VZ];
                                net_color.mV[VW] *= param_net.mV[VW];
                                break;
                        case OP_BLEND:
                                net_color = lerp(net_color, param_net, param->getWeight());
                                break;
                        default:
                                llassert(0);
                                break;
                        }
                }
        
                net_color.mV[VX] = llclampf( net_color.mV[VX] );
                net_color.mV[VY] = llclampf( net_color.mV[VY] );
                net_color.mV[VZ] = llclampf( net_color.mV[VZ] );
                net_color.mV[VW] = llclampf( net_color.mV[VW] );

                return net_color;
        }
        return LLColor4( 1.f, 1.f, 1.f, 1.f );
}

//-----------------------------------------------------------------------------
// LLTexParamColorInfo
//-----------------------------------------------------------------------------
LLTexParamColorInfo::LLTexParamColorInfo()
        :
        mOperation( OP_ADD ),
        mNumColors( 0 )
{
}

BOOL LLTexParamColorInfo::parseXml(LLXmlTreeNode *node)
{
        llassert( node->hasName( "param" ) && node->getChildByName( "param_color" ) );

        if (!LLViewerVisualParamInfo::parseXml(node))
                return FALSE;

        LLXmlTreeNode* param_color_node = node->getChildByName( "param_color" );
        if( !param_color_node )
        {
                return FALSE;
        }

        LLString op_string;
        static LLStdStringHandle operation_string = LLXmlTree::addAttributeString("operation");
        if( param_color_node->getFastAttributeString( operation_string, op_string ) )
        {
                LLString::toLower(op_string);
                if              ( op_string == "add" )          mOperation = OP_ADD;
                else if ( op_string == "multiply" )     mOperation = OP_MULTIPLY;
                else if ( op_string == "blend" )        mOperation = OP_BLEND;
        }

        mNumColors = 0;

        LLColor4U color4u;
        for (LLXmlTreeNode* child = param_color_node->getChildByName( "value" );
                 child;
                 child = param_color_node->getNextNamedChild())
        {
                if( (mNumColors < MAX_COLOR_VALUES) )
                {
                        static LLStdStringHandle color_string = LLXmlTree::addAttributeString("color");
                        if( child->getFastAttributeColor4U( color_string, color4u ) )
                        {
                                mColors[ mNumColors ].setVec(color4u);
                                mNumColors++;
                        }
                }
        }
        if( !mNumColors )
        {
                llwarns << "<param_color> is missing <value> sub-elements" << llendl;
                return FALSE;
        }

        if( (mOperation == OP_BLEND) && (mNumColors != 1) )
        {
                llwarns << "<param_color> with operation\"blend\" must have exactly one <value>" << llendl;
                return FALSE;
        }
        
        return TRUE;
}

//-----------------------------------------------------------------------------
// LLTexParamColor
//-----------------------------------------------------------------------------
LLTexParamColor::LLTexParamColor( LLTexGlobalColor* tex_global_color )
        :
        mAvgDistortionVec(1.f, 1.f, 1.f),
        mTexGlobalColor( tex_global_color ),
        mTexLayer( NULL ),
        mAvatar( tex_global_color->getAvatar() )
{
}

LLTexParamColor::LLTexParamColor( LLTexLayer* layer )
        :
        mAvgDistortionVec(1.f, 1.f, 1.f),
        mTexGlobalColor( NULL ),
        mTexLayer( layer ),
        mAvatar( layer->getTexLayerSet()->getAvatar() )
{
}


LLTexParamColor::~LLTexParamColor()
{
}

//-----------------------------------------------------------------------------
// setInfo()
//-----------------------------------------------------------------------------

BOOL LLTexParamColor::setInfo(LLTexParamColorInfo *info)
{
        llassert(mInfo == NULL);
        if (info->mID < 0)
                return FALSE;
        mID = info->mID;
        mInfo = info;

        mAvatar->addVisualParam( this );
        setWeight( getDefaultWeight(), FALSE );

        return TRUE;
}

LLColor4 LLTexParamColor::getNetColor()
{
        llassert( getInfo()->mNumColors >= 1 );

        F32 effective_weight = ( mAvatar && (mAvatar->getSex() & getSex()) ) ? mCurWeight : getDefaultWeight();

        S32 index_last = getInfo()->mNumColors - 1;
        F32 scaled_weight = effective_weight * index_last;
        S32 index_start = (S32) scaled_weight;
        S32 index_end = index_start + 1;
        if( index_start == index_last )
        {
                return getInfo()->mColors[index_last];
        }
        else
        {
                F32 weight = scaled_weight - index_start;
                const LLColor4 *start = &getInfo()->mColors[ index_start ];
                const LLColor4 *end   = &getInfo()->mColors[ index_end ];
                return LLColor4( 
                        (1.f - weight) * start->mV[VX] + weight * end->mV[VX],
                        (1.f - weight) * start->mV[VY] + weight * end->mV[VY],
                        (1.f - weight) * start->mV[VZ] + weight * end->mV[VZ],
                        (1.f - weight) * start->mV[VW] + weight * end->mV[VW] );
        }
}

void LLTexParamColor::setWeight(F32 weight, BOOL set_by_user)
{
        if (mIsAnimating)
        {
                return;
        }
        F32 min_weight = getMinWeight();
        F32 max_weight = getMaxWeight();
        F32 new_weight = llclamp(weight, min_weight, max_weight);
        U8 cur_u8 = F32_to_U8( mCurWeight, min_weight, max_weight );
        U8 new_u8 = F32_to_U8( new_weight, min_weight, max_weight );
        if( cur_u8 != new_u8)
        {
                mCurWeight = new_weight;

                if( getInfo()->mNumColors <= 0 )
                {
                        // This will happen when we set the default weight the first time.
                        return;
                }

                if( mAvatar->getSex() & getSex() )
                {
                        if( mTexGlobalColor )
                        {
                                mAvatar->onGlobalColorChanged( mTexGlobalColor, set_by_user );
                        }
                        else
                        if( mTexLayer )
                        {
                                mAvatar->invalidateComposite( mTexLayer->getTexLayerSet(), set_by_user );
                        }
                }
//              llinfos << "param " << mName << " = " << new_weight << llendl;
        }
}

void LLTexParamColor::setAnimationTarget(F32 target_value, BOOL set_by_user)
{ 
        // set value first then set interpolating flag to ignore further updates
        mTargetWeight = target_value; 
        setWeight(target_value, set_by_user);
        mIsAnimating = TRUE;
        if (mNext)
        {
                mNext->setAnimationTarget(target_value, set_by_user);
        }
}

void LLTexParamColor::animate(F32 delta, BOOL set_by_user)
{
        if (mNext)
        {
                mNext->animate(delta, set_by_user);
        }
}


//-----------------------------------------------------------------------------
// LLTexStaticImageList
//-----------------------------------------------------------------------------

// static
LLTexStaticImageList gTexStaticImageList;
LLStringTable LLTexStaticImageList::sImageNames(16384);

LLTexStaticImageList::LLTexStaticImageList()
        :
        mGLBytes( 0 ),
        mTGABytes( 0 )
{}

LLTexStaticImageList::~LLTexStaticImageList()
{
        deleteCachedImages();
}

void LLTexStaticImageList::dumpByteCount()
{
        llinfos << "Avatar Static Textures " <<
                "KB GL:" << (mGLBytes / 1024) <<
                "KB TGA:" << (mTGABytes / 1024) << "KB" << llendl;
}

void LLTexStaticImageList::deleteCachedImages()
{
        if( mGLBytes || mTGABytes )
        {
                llinfos << "Clearing Static Textures " <<
                        "KB GL:" << (mGLBytes / 1024) <<
                        "KB TGA:" << (mTGABytes / 1024) << "KB" << llendl;

                //mStaticImageLists uses LLPointers, clear() will cause deletion
                
                mStaticImageListTGA.clear();
                mStaticImageListGL.clear();
                
                mGLBytes = 0;
                mTGABytes = 0;
        }
}

// Note: in general, for a given image image we'll call either getImageTga() or getImageGL().
// We call getImageTga() if the image is used as an alpha gradient.
// Otherwise, we call getImageGL()

// Returns an LLImageTGA that contains the encoded data from a tga file named file_name.
// Caches the result to speed identical subsequent requests.
LLImageTGA* LLTexStaticImageList::getImageTGA(const LLString& file_name)
{
        const char *namekey = sImageNames.addString(file_name);
        image_tga_map_t::iterator iter = mStaticImageListTGA.find(namekey);
        if( iter != mStaticImageListTGA.end() )
        {
                return iter->second;
        }
        else
        {
                std::string path;
                path = gDirUtilp->getExpandedFilename(LL_PATH_CHARACTER,file_name.c_str());
                LLPointer<LLImageTGA> image_tga = new LLImageTGA( path );
                if( image_tga->getDataSize() > 0 )
                {
                        mStaticImageListTGA[ namekey ] = image_tga;
                        mTGABytes += image_tga->getDataSize();
                        return image_tga;
                }
                else
                {
                        return NULL;
                }
        }
}



// Returns a GL Image (without a backing ImageRaw) that contains the decoded data from a tga file named file_name.
// Caches the result to speed identical subsequent requests.
LLImageGL* LLTexStaticImageList::getImageGL(const LLString& file_name, BOOL is_mask )
{
        LLPointer<LLImageGL> image_gl;
        const char *namekey = sImageNames.addString(file_name);

        image_gl_map_t::iterator iter = mStaticImageListGL.find(namekey);
        if( iter != mStaticImageListGL.end() )
        {
                image_gl = iter->second;
        }
        else
        {
                image_gl = new LLImageGL( FALSE );
                LLPointer<LLImageRaw> image_raw = new LLImageRaw;
                if( loadImageRaw( file_name, image_raw ) )
                {
                        if( (image_raw->getComponents() == 1) && is_mask )
                        {
                                // Note: these are static, unchanging images so it's ok to assume
                                // that once an image is a mask it's always a mask.
                                image_gl->setExplicitFormat( GL_ALPHA8, GL_ALPHA );
                        }
                        image_gl->createGLTexture(0, image_raw);

                        image_gl->bind();
                        image_gl->setClamp(TRUE, TRUE);

                        mStaticImageListGL [ namekey ] = image_gl;
                        mGLBytes += (S32)image_gl->getWidth() * image_gl->getHeight() * image_gl->getComponents();
                }
                else
                {
                        image_gl = NULL;
                }
        }

        return image_gl;
}

// Reads a .tga file, decodes it, and puts the decoded data in image_raw.
// Returns TRUE if successful.
BOOL LLTexStaticImageList::loadImageRaw( const LLString& file_name, LLImageRaw* image_raw )
{
        BOOL success = FALSE;
        std::string path;
        path = gDirUtilp->getExpandedFilename(LL_PATH_CHARACTER,file_name.c_str());
        LLPointer<LLImageTGA> image_tga = new LLImageTGA( path );
        if( image_tga->getDataSize() > 0 )
        {
                // Copy data from tga to raw.
                success = image_tga->decode( image_raw );
        }

        return success;
}

//-----------------------------------------------------------------------------
// LLMaskedMorph()
//-----------------------------------------------------------------------------
LLMaskedMorph::LLMaskedMorph( LLPolyMorphTarget *morph_target, BOOL invert ) : mMorphTarget(morph_target), mInvert(invert)
{
        morph_target->addPendingMorphMask();
}


//-----------------------------------------------------------------------------
// LLGradientPaletteList
//-----------------------------------------------------------------------------

LLGradientPaletteList::~LLGradientPaletteList()
{
        // Note: can't just call deleteAllData() because the data values are arrays.
        for( palette_map_t::iterator iter = mPaletteMap.begin();
                 iter != mPaletteMap.end(); iter++ )
        {
                U8* data = iter->second;
                delete []data;
        }
}

void LLGradientPaletteList::initPalette(F32 domain)
{
        palette_map_t::iterator iter = mPaletteMap.find( domain );
        if( iter == mPaletteMap.end() )
        {
                U8 *palette = new U8[512 * 4];
                mPaletteMap[domain] = palette;
                S32 ramp_start = 255 - llfloor(domain * 255.f);
                S32 ramp_end = 255;
                F32 ramp_factor = (ramp_end == ramp_start) ? 0.f : (255.f / ((F32)ramp_end - (F32)ramp_start));

                // *TODO: move conditionals outside of loop, since this really
                // is just a sequential process.
                for (S32 i = 0; i < 512; i++)
                {
                        palette[(i * 4) + 1] = 0;
                        palette[(i * 4) + 2] = 0;
                        if (i <= ramp_start)
                        {
                                palette[(i * 4)] = 0;
                                palette[(i * 4) + 3] = 0;
                        }
                        else if (i < ramp_end)
                        {
                                palette[(i * 4)] = llfloor(((F32)i - (F32)ramp_start) * ramp_factor);
                                palette[(i * 4) + 3] = llfloor(((F32)i - (F32)ramp_start) * ramp_factor);
                        }
                        else
                        {
                                palette[(i * 4)] = 255;
                                palette[(i * 4) + 3] = 255;
                        }
                }
        }
}

void LLGradientPaletteList::setHardwarePalette( F32 domain, F32 effective_weight )
{
        palette_map_t::iterator iter = mPaletteMap.find( domain );
        if( iter != mPaletteMap.end() )
        {
                U8* palette = iter->second;
                set_palette( palette + llfloor(effective_weight * (255.f * (1.f - domain))) * 4);
        }
        else
        {
                llwarns << "LLGradientPaletteList::setHardwarePalette() missing domain " << domain << llendl;
        }
}

---