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/**
* @file llsurface.h
* @brief Description of LLSurface class
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2009, 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_LLSURFACE_H
#define LL_LLSURFACE_H
//#include "vmath.h"
#include "v3math.h"
#include "v3dmath.h"
#include "v4math.h"
#include "m3math.h"
#include "m4math.h"
#include "llquaternion.h"
#include "v4coloru.h"
#include "v4color.h"
#include "llvowater.h"
#include "llpatchvertexarray.h"
#include "llviewerimage.h"
class LLTimer;
class LLUUID;
class LLAgent;
class LLStat;
static const U8 NO_EDGE = 0x00;
static const U8 EAST_EDGE = 0x01;
static const U8 NORTH_EDGE = 0x02;
static const U8 WEST_EDGE = 0x04;
static const U8 SOUTH_EDGE = 0x08;
static const S32 ONE_MORE_THAN_NEIGHBOR = 1;
static const S32 EQUAL_TO_NEIGHBOR = 0;
static const S32 ONE_LESS_THAN_NEIGHBOR = -1;
const S32 ABOVE_WATERLINE_ALPHA = 32; // The alpha of water when the land elevation is above the waterline.
class LLViewerRegion;
class LLSurfacePatch;
class LLBitPack;
class LLGroupHeader;
class LLSurface
{
public:
LLSurface(U32 type, LLViewerRegion *regionp = NULL);
virtual ~LLSurface();
static void initClasses(); // Do class initialization for LLSurface and its child classes.
void create(const S32 surface_grid_width,
const S32 surface_patch_width,
const LLVector3d &origin_global,
const F32 width); // Allocates and initializes surface
void setRegion(LLViewerRegion *regionp);
void setOriginGlobal(const LLVector3d &origin_global);
void connectNeighbor(LLSurface *neighborp, U32 direction);
void disconnectNeighbor(LLSurface *neighborp);
void disconnectAllNeighbors();
virtual void decompressDCTPatch(LLBitPack &bitpack, LLGroupHeader *gopp, BOOL b_large_patch);
virtual void updatePatchVisibilities(LLAgent &agent);
inline F32 getZ(const U32 k) const { return mSurfaceZ[k]; }
inline F32 getZ(const S32 i, const S32 j) const { return mSurfaceZ[i + j*mGridsPerEdge]; }
LLVector3 getOriginAgent() const;
const LLVector3d &getOriginGlobal() const;
F32 getMetersPerGrid() const;
S32 getGridsPerEdge() const;
S32 getPatchesPerEdge() const;
S32 getGridsPerPatchEdge() const;
U32 getRenderStride(const U32 render_level) const;
U32 getRenderLevel(const U32 render_stride) const;
// Returns the height of the surface immediately above (or below) location,
// or if location is not above surface returns zero.
F32 resolveHeightRegion(const F32 x, const F32 y) const;
F32 resolveHeightRegion(const LLVector3 &location) const
{ return resolveHeightRegion( location.mV[VX], location.mV[VY] ); }
F32 resolveHeightGlobal(const LLVector3d &position_global) const;
LLVector3 resolveNormalGlobal(const LLVector3d& v) const; // Returns normal to surface
LLSurfacePatch *resolvePatchRegion(const F32 x, const F32 y) const;
LLSurfacePatch *resolvePatchRegion(const LLVector3 &position_region) const;
LLSurfacePatch *resolvePatchGlobal(const LLVector3d &position_global) const;
// Update methods (called during idle, normally)
BOOL idleUpdate(F32 max_update_time);
BOOL containsPosition(const LLVector3 &position);
void moveZ(const S32 x, const S32 y, const F32 delta);
LLViewerRegion *getRegion() const { return mRegionp; }
F32 getMinZ() const { return mMinZ; }
F32 getMaxZ() const { return mMaxZ; }
void setWaterHeight(F32 height);
F32 getWaterHeight() const;
LLViewerImage *getSTexture();
LLViewerImage *getWaterTexture();
BOOL hasZData() const { return mHasZData; }
void dirtyAllPatches(); // Use this to dirty all patches when changing terrain parameters
void dirtySurfacePatch(LLSurfacePatch *patchp);
LLVOWater *getWaterObj() { return mWaterObjp; }
static void setTextureSize(const S32 texture_size);
friend class LLSurfacePatch;
friend std::ostream& operator<<(std::ostream &s, const LLSurface &S);
public:
// Number of grid points on one side of a region, including +1 buffer for
// north and east edge.
S32 mGridsPerEdge;
F32 mOOGridsPerEdge; // Inverse of grids per edge
S32 mPatchesPerEdge; // Number of patches on one side of a region
S32 mNumberOfPatches; // Total number of patches
// Each surface points at 8 neighbors (or NULL)
// +---+---+---+
// |NW | N | NE|
// +---+---+---+
// | W | 0 | E |
// +---+---+---+
// |SW | S | SE|
// +---+---+---+
LLSurface *mNeighbors[8]; // Adjacent patches
U32 mType; // Useful for identifying derived classes
F32 mDetailTextureScale; // Number of times to repeat detail texture across this surface
static F32 sTextureUpdateTime;
static S32 sTexelsUpdated;
protected:
void createSTexture();
void createWaterTexture();
void initTextures();
void initWater();
void createPatchData(); // Allocates memory for patches.
void destroyPatchData(); // Deallocates memory for patches.
BOOL generateWaterTexture(const F32 x, const F32 y,
const F32 width, const F32 height); // Generate texture from composition values.
//F32 updateTexture(LLSurfacePatch *ppatch);
LLSurfacePatch *getPatch(const S32 x, const S32 y) const;
protected:
LLVector3d mOriginGlobal; // In absolute frame
LLSurfacePatch *mPatchList; // Array of all patches
// Array of grid data, mGridsPerEdge * mGridsPerEdge
F32 *mSurfaceZ;
// Array of grid normals, mGridsPerEdge * mGridsPerEdge
LLVector3 *mNorm;
std::set<LLSurfacePatch *> mDirtyPatchList;
// The textures should never be directly initialized - use the setter methods!
LLPointer<LLViewerImage> mSTexturep; // Texture for surface
LLPointer<LLViewerImage> mWaterTexturep; // Water texture
LLPointer<LLVOWater> mWaterObjp;
// When we want multiple cameras we'll need one of each these for each camera
S32 mVisiblePatchCount;
U32 mGridsPerPatchEdge; // Number of grid points on a side of a patch
F32 mMetersPerGrid; // Converts (i,j) indecies to distance
F32 mMetersPerEdge; // = mMetersPerGrid * (mGridsPerEdge-1)
LLPatchVertexArray mPVArray;
BOOL mHasZData; // We've received any patch data for this surface.
F32 mMinZ; // min z for this region (during the session)
F32 mMaxZ; // max z for this region (during the session)
S32 mSurfacePatchUpdateCount; // Number of frames since last update.
private:
LLViewerRegion *mRegionp; // Patch whose coordinate system this surface is using.
static S32 sTextureSize; // Size of the surface texture
};
// . __.
// Z /|\ /| Y North
// | /
// | / |<----------------- mGridsPerSurfaceEdge --------------->|
// | / __________________________________________________________
// |/______\ X /_______________________________________________________ /
// / / / / / / / /M*M-2 /M*M-1 / /
// /______/______/______/______/______/______/______/______/ /
// / / / / / / / / / /
// /______/______/______/______/______/______/______/______/ /
// / / / / / / / / / /
// /______/______/______/______/______/______/______/______/ /
// West / / / / / / / / / /
// /______/______/______/______/______/______/______/______/ / East
// /... / / / / / / / / /
// /______/______/______/______/______/______/______/______/ /
// _. / 2M / / / / / / / / /
// /| /______/______/______/______/______/______/______/______/ /
// / / M / M+1 / M+2 / ... / / / / 2M-1 / /
// j /______/______/______/______/______/______/______/______/ /
// / 0 / 1 / 2 / ... / / / / M-1 / /
// /______/______/______/______/______/______/______/______/_/
// South |<-L->|
// i -->
//
// where M = mSurfPatchWidth
// and L = mPatchGridWidth
//
// Notice that mGridsPerSurfaceEdge = a power of two + 1
// This provides a buffer on the east and north edges that will allow us to
// fill the cracks between adjacent surfaces when rendering.
#endif
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