llcloud.h
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- /**
- * @file llcloud.h
- * @brief Description of viewer LLCloudLayer class
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, 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 "llpointer.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