/** 
 * @file llvotextbubble.cpp
 * @brief Viewer-object text bubble.
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2007, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlife.com/developers/opensource/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at http://secondlife.com/developers/opensource/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llvotextbubble.h"

#include "imageids.h"
#include "llviewercontrol.h"
#include "llprimitive.h"
#include "llsphere.h"

#include "llagent.h"
#include "llbox.h"
#include "lldrawable.h"
#include "llface.h"
#include "llviewerimagelist.h"
#include "llvolume.h"
#include "pipeline.h"
#include "llviewerregion.h"

LLVOTextBubble::LLVOTextBubble(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp)
:	LLAlphaObject(id, pcode, regionp)
{
	setScale(LLVector3(1.5f, 1.5f, 0.25f));
	mbCanSelect = FALSE;
	mLOD = MIN_LOD;
	mVolumeChanged = TRUE;
	setVelocity(LLVector3(0.f, 0.f, 0.75f));
	LLVolumeParams volume_params;
	volume_params.setType(LL_PCODE_PROFILE_CIRCLE, LL_PCODE_PATH_LINE);
	volume_params.setBeginAndEndS(0.f, 1.f);
	volume_params.setBeginAndEndT(0.f, 1.f);
	volume_params.setRatio(0.25f, 0.25f);
	volume_params.setShear(0.f, 0.f);
	setVolume(volume_params);
	mColor = LLColor4(1.0f, 0.0f, 0.0f, 1.f);
	S32 i;
	for (i = 0; i < getNumTEs(); i++)
	{
		setTEColor(i, mColor);
		setTETexture(i, LLUUID(IMG_DEFAULT));
	}
}


LLVOTextBubble::~LLVOTextBubble()
{
}


BOOL LLVOTextBubble::isActive() const
{
	return TRUE;
}

BOOL LLVOTextBubble::idleUpdate(LLAgent &agent, LLWorld	&world, const F64 &time)
{
	F32 dt = mUpdateTimer.getElapsedTimeF32();
	// Die after a few seconds.
	if (dt > 1.5f)
	{
		return FALSE;
	}

	LLViewerObject::idleUpdate(agent, world, time);

	setScale(0.5f * (1.f+dt) * LLVector3(1.5f, 1.5f, 0.5f));

	F32 alpha = 0.35f*dt;

	LLColor4 color = mColor;
	color.mV[VALPHA] -= alpha;
	if (color.mV[VALPHA] <= 0.05f)
	{
		return FALSE;
	}
	S32 i;
	for (i = 0; i < getNumTEs(); i++)
	{
		setTEColor(i, color);
		setTEFullbright(i, TRUE);
	}

	gPipeline.markRebuild(mDrawable, LLDrawable::REBUILD_VOLUME, TRUE);
	return TRUE;
}


void LLVOTextBubble::updateTextures(LLAgent &agent)
{
	// Update the image levels of all textures...
	// First we do some quick checks.
	U32 i;

	// This doesn't take into account whether the object is in front
	// or behind...

	LLVector3 position_local = getPositionAgent() - agent.getCameraPositionAgent();
	F32 dot_product = position_local * agent.getFrameAgent().getAtAxis();
	F32 cos_angle = dot_product / position_local.magVec();

	if (cos_angle > 1.f)
	{
		cos_angle = 1.f;
	}

	for (i = 0; i < getNumTEs(); i++)
	{
		const LLTextureEntry *te = getTE(i);
		F32 texel_area_ratio = fabs(te->mScaleS * te->mScaleT);

		LLViewerImage *imagep = getTEImage(i);
		if (imagep)
		{
			imagep->addTextureStats(mPixelArea, texel_area_ratio, cos_angle);
		}
	}
}


LLDrawable *LLVOTextBubble::createDrawable(LLPipeline *pipeline)
{
	pipeline->allocDrawable(this);
	mDrawable->setLit(FALSE);
	mDrawable->setRenderType(LLPipeline::RENDER_TYPE_VOLUME);
	
	for (U32 i = 0; i < getNumTEs(); i++)
	{
		LLViewerImage *imagep;
		const LLTextureEntry *texture_entry = getTE(i);
		imagep = gImageList.getImage(texture_entry->getID());

		mDrawable->addFace((LLFacePool*) NULL, imagep);
	}

	return mDrawable;
}


BOOL LLVOTextBubble::setVolume(const LLVolumeParams &volume_params)
{
	if (LLPrimitive::setVolume(volume_params, mLOD))
	{
		if (mDrawable)
		{
			gPipeline.markRebuild(mDrawable, LLDrawable::REBUILD_VOLUME, TRUE);
			mVolumeChanged = TRUE;
		}
		return TRUE;
	}
	return FALSE;
}


BOOL LLVOTextBubble::updateLOD()
{
	return FALSE;
}

BOOL LLVOTextBubble::updateGeometry(LLDrawable *drawable)
{
 	if (!(gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_VOLUME)))
		return TRUE;
	
	if (mVolumeChanged)
	{
		LLVolumeParams volume_params = getVolume()->getParams();
		setVolume(volume_params);

		LLPipeline::sCompiles++;

		drawable->setNumFaces(getVolume()->getNumFaces(), drawable->getFace(0)->getPool(), getTEImage(0));
	}

	LLMatrix4 identity4;
	LLMatrix3 identity3;
	for (S32 i = 0; i < drawable->getNumFaces(); i++)
	{
		LLFace *face = drawable->getFace(i);
		face->setTEOffset(i);
		face->setTexture(LLViewerImage::sSmokeImagep);
		face->setState(LLFace::FULLBRIGHT);
	}

	mVolumeChanged = FALSE;

	mDrawable->movePartition();
	return TRUE;
}

void LLVOTextBubble::updateFaceSize(S32 idx)
{
	LLFace* face = mDrawable->getFace(idx);
	
	if (idx == 0 || idx == 2)
	{
		face->setSize(0,0);
	}
	else
	{
		const LLVolumeFace& vol_face = getVolume()->getVolumeFace(idx);
		face->setSize(vol_face.mVertices.size(), vol_face.mIndices.size());
	}
}

void LLVOTextBubble::getGeometry(S32 idx,
								LLStrider<LLVector3>& verticesp,
								LLStrider<LLVector3>& normalsp, 
								LLStrider<LLVector2>& texcoordsp,
								LLStrider<LLColor4U>& colorsp, 
								LLStrider<U16>& indicesp) 
{
	if (idx == 0 || idx == 2)
	{
		return;
	}

	const LLVolumeFace& face = getVolume()->getVolumeFace(idx);
	
	LLVector3 pos = getPositionAgent();
	LLColor4U color = LLColor4U(getTE(idx)->getColor());
	U32 offset = mDrawable->getFace(idx)->getGeomIndex();
	
	for (U32 i = 0; i < face.mVertices.size(); i++)
	{
		*verticesp++ = face.mVertices[i].mPosition.scaledVec(getScale()) + pos;
		*normalsp++ = face.mVertices[i].mNormal;
		*texcoordsp++ = face.mVertices[i].mTexCoord;
		*colorsp++ = color;
	}
	
	for (U32 i = 0; i < face.mIndices.size(); i++)
	{
		*indicesp++ = face.mIndices[i] + offset;
	}
}

U32 LLVOTextBubble::getPartitionType() const
{ 
	return LLViewerRegion::PARTITION_PARTICLE; 
}