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/**
* @file llcloud.h
* @brief Description of viewer LLCloudLayer class
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLCLOUD_H
#define LL_LLCLOUD_H
// Some ideas on how clouds should work
//
// Each region has a cloud layer
// Each cloud layer has pre-allocated space for N clouds
// The LLSky class knows the max number of clouds to render M.
// All clouds use the same texture, but the tex-coords can take on 8 configurations
// (four rotations, front and back)
//
// The sky's part
// --------------
// The sky knows that A clouds have been assigned to regions and there are B left over.
// Divide B by number of active regions to get C.
// Ask each region to add C more clouds and return total number D.
// Add up all the D's to get a new A.
//
// The cloud layer's part
// ----------------------
// The cloud layer is a grid of possibility. Each grid's value represents the probablility
// (0.0 to 1.0) that a cloud placement query will succeed.
//
// The sky asks the region to add C more clouds.
// The cloud layer tries a total of E times to place clouds and returns total cloud count.
//
// Clouds move according to local wind velocity.
// If a cloud moves out of region then it's location is sent to neighbor region
// or it is allowed to drift and decay.
//
// The clouds in non-visible regions do not propagate every frame.
// Each frame one non-visible region is allowed to propagate it's clouds
// (might have to check to see if incoming cloud was already visible or not).
//
//
#include "llmath.h"
//#include "vmath.h"
#include "v3math.h"
#include "v3dmath.h"
#include "v4math.h"
#include "v4color.h"
#include "llmemory.h"
#include "lldarray.h"
#include "llframetimer.h"
const U32 CLOUD_GRIDS_PER_EDGE = 16;
const F32 CLOUD_PUFF_WIDTH = 64.f;
const F32 CLOUD_PUFF_HEIGHT = 48.f;
class LLWind;
class LLVOClouds;
class LLViewerRegion;
class LLCloudLayer;
class LLBitPack;
class LLGroupHeader;
const S32 CLOUD_GROUPS_PER_EDGE = 4;
class LLCloudPuff
{
public:
LLCloudPuff();
const LLVector3d &getPositionGlobal() const { return mPositionGlobal; }
friend class LLCloudGroup;
void updatePuffs(const F32 dt);
void updatePuffOwnership();
F32 getAlpha() const { return mAlpha; }
U32 getLifeState() const { return mLifeState; }
void setLifeState(const U32 state) { mLifeState = state; }
BOOL isDead() const { return mAlpha <= 0.f; }
static S32 sPuffCount;
protected:
F32 mAlpha;
F32 mRate;
LLVector3d mPositionGlobal;
BOOL mLifeState;
};
class LLCloudGroup
{
public:
LLCloudGroup();
void cleanup();
void setCloudLayerp(LLCloudLayer *clp) { mCloudLayerp = clp; }
void setCenterRegion(const LLVector3 ¢er);
void updatePuffs(const F32 dt);
void updatePuffOwnership();
void updatePuffCount();
BOOL inGroup(const LLCloudPuff &puff) const;
F32 getDensity() const { return mDensity; }
S32 getNumPuffs() const { return (S32) mCloudPuffs.size(); }
const LLCloudPuff &getPuff(const S32 i) { return mCloudPuffs[i]; }
protected:
LLCloudLayer *mCloudLayerp;
LLVector3 mCenterRegion;
F32 mDensity;
S32 mTargetPuffCount;
std::vector<LLCloudPuff> mCloudPuffs;
LLPointer<LLVOClouds> mVOCloudsp;
};
class LLCloudLayer
{
public:
LLCloudLayer();
~LLCloudLayer();
void create(LLViewerRegion *regionp);
void destroy();
void reset(); // Clears all active cloud puffs
void updatePuffs(const F32 dt);
void updatePuffOwnership();
void updatePuffCount();
LLCloudGroup *findCloudGroup(const LLCloudPuff &puff);
void setRegion(LLViewerRegion *regionp);
LLViewerRegion* getRegion() const { return mRegionp; }
void setWindPointer(LLWind *windp);
void setOriginGlobal(const LLVector3d &origin_global) { mOriginGlobal = origin_global; }
void setWidth(F32 width);
void setBrightness(F32 brightness);
void setSunColor(const LLColor4 &color);
F32 getDensityRegion(const LLVector3 &pos_region); // "position" is in local coordinates
void decompress(LLBitPack &bitpack, LLGroupHeader *group_header);
LLCloudLayer* getNeighbor(const S32 n) const { return mNeighbors[n]; }
void connectNeighbor(LLCloudLayer *cloudp, U32 direction);
void disconnectNeighbor(U32 direction);
void disconnectAllNeighbors();
public:
LLVector3d mOriginGlobal;
F32 mMetersPerEdge;
F32 mMetersPerGrid;
F32 mMaxAlpha; // The max cloud puff _render_ alpha
protected:
LLCloudLayer *mNeighbors[4];
LLWind *mWindp;
LLViewerRegion *mRegionp;
F32 *mDensityp; // the probability density grid
LLCloudGroup mCloudGroups[CLOUD_GROUPS_PER_EDGE][CLOUD_GROUPS_PER_EDGE];
};
#endif
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