llsurface.h

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#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);

        void renderSurfaceBounds();
        
        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;
        static LLStat sTexelsUpdatedPerSecStat;

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)

        F32                     mSurfaceTexScale;                       // Scale factors for automatic tex coord generation
        F32                     mDetailTexScale;

        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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