llvotreenew.h

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#ifndef LL_LLVOTREENEW_H
#define LL_LLVOTREENEW_H

#include "llviewerobject.h"
#include "lldarray.h"
#include "xform.h"

#include "lltreeparams.h"
#include "llstrider.h"
#include "v2math.h"
#include "v3math.h"
#include "llviewerimage.h"

class LLFace;
class LLDrawPool;

// number of static arrays created
const U8 MAX_SPECIES = 16;      // max species of trees
const U8 MAX_PARTS = 15;        // trunk, 2 or 3 branches per species?
const U8 MAX_RES = 6;           // max # cross sections for a branch curve
const U8 MAX_FLARE = 6;         // max # cross sections for flare of trunk
const U8 MAX_LEVELS = 3;

// initial vertex array allocations
const U32 NUM_INIT_VERTS = 5000;                        // number of vertices/normals/texcoords
const U32 NUM_INIT_INDICES = 15000;                     // number of indices to vert array (3 vertices per triangle, roughly 3x)
const U32 NUM_TIMES_TO_DOUBLE = 2;                      // if we go over initial allocations, num times to double each step

// for finding the closest parts...

// the parts are searched based on:
const F32 MAX_LOBES_DIFF = 2;
const F32 MAX_LOBEDEPTH_DIFF = .3f;
const F32 MAX_CURVEBACK_DIFF = 20.0f;
const F32 MAX_CURVE_DIFF = 15.0f;
const F32 MAX_CURVE_V_DIFF = 20.0f;

const F32 CURVEV_DIVIDER = 10.0f;       // curveV/CURVEV_DIVIDER = # branch variances...
const U8 MAX_VARS = 3;                          // max number of variations of branches

const U8 MAX_RAND_NUMS = 100;           // max number of rand numbers to pregenerate and store

// texture params
const F32 WIDTH_OF_BARK = .48f;

class LLVOTreeNew : public LLViewerObject
{
public:

        // Some random number generators using the pre-generated random numbers
        // return +- negPos
        static S32 llrand_signed(S32 negPos)
        {
                return (ll_rand((U32)negPos * 2) - negPos);
        };

        static S32 llrand_signed(S32 negPos, U32 index)
        {
                return lltrunc((sRandNums[index % MAX_RAND_NUMS] * (negPos * 2.0f) - negPos));
        };
        
        static S32 llrand_unsigned(S32 pos, U32 index)
        {
                return lltrunc((sRandNums[index % MAX_RAND_NUMS] * pos));
        };

        // return +- negPos
        static F32 llfrand_signed(F32 negPos)
        {
                return (ll_frand(negPos * 2.0f) - negPos);
        };

        static F32 llfrand_signed(F32 negPos, U32 index)
        {
                return (sRandNums[index % MAX_RAND_NUMS] * negPos * 2.0f) - negPos;
        };

        static F32 llfrand_unsigned(F32 pos, U32 index)
        {
                return sRandNums[index % MAX_RAND_NUMS] * pos;
        };

        // return between 0-pos
        static F32 llfrand_unsigned(F32 pos)
        {
                return ll_frand(pos);
        };

        static void cleanupTextures() {};       // not needed anymore

        struct TreePart
        {
                F32 mRadius;            // scale x/y
                F32 mLength;            // scale z
                F32 mCurve;
                F32 mCurveV;
                F32 mCurveRes;
                F32 mCurveBack;
                U8 mLobes;
                F32 mLobeDepth;
                U8 mLevel;
                U32 mNumTris;
                U8 mVertsPerSection;
                U8 mNumVariants;

                // first index into the drawpool arrays for this particular branch
                U32 mIndiceIndex[MAX_VARS];
                U32 mOffsets[MAX_VARS][MAX_RES];                // offsets for the partial branch pieces
                // local section frames for this branch
                LLMatrix4 mFrames[MAX_VARS][(MAX_RES*(MAX_RES + 1))/2]; // (0...n) + (1...n) + ... + (n-1..n)
                LLDynamicArray<LLVector3> mFaceNormals;

        };

        LLVOTreeNew(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp);
        virtual ~LLVOTreeNew();

        /*virtual*/ 
        U32 processUpdateMessage(LLMessageSystem *mesgsys,
                                                                                        void **user_data,
                                                                                        U32 block_num, const EObjectUpdateType update_type,
                                                                                        LLDataPacker *dp);

        /*virtual*/ BOOL idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time);

        /*virtual*/ void render(LLAgent &agent);
        /*virtual*/ void updateTextures(LLAgent &agent);

        /*virtual*/ LLDrawable* createDrawable(LLPipeline *pipeline);
        /*virtual*/ BOOL                updateGeometry(LLDrawable *drawable);

        F32 CalcZStep(TreePart *part, U8 section);

        void createPart(U8 level, F32 length, F32 radius, LLStrider<LLVector3> &vertices, LLStrider<LLVector3> &normals, 
                                                        LLStrider<LLVector2> &tex_coords, U32 *indices, 
                                                        U32 &curVertexIndex, U32 &curTexCoordIndex,
                                                        U32 &curNormalIndex, U32 &curIndiceIndex);

        S32 findSimilarPart(U8 level);

        F32 CalculateSectionRadius(U8 level, F32 y, F32 stemLength, F32 stemRadius);
        //F32 CalculateVerticalAttraction(U8 level, LLMatrix4 &sectionFrame);

        void createSection(LLMatrix4 &frame, TreePart *part, F32 sectionRadius, F32 stemZ, 
                                                          LLStrider<LLVector3> &vertices, LLStrider<LLVector2> &tex_coords, U32 *indices, 
                                                          U32 &curVertexIndex, U32 &curTexCoordIndex, U32 &curIndiceIndex, U8 curSection, BOOL firstBranch);

        void genIndicesAndFaceNormalsForLastSection(TreePart *part, U8 numVerts, LLStrider<LLVector3> &vertices, U32 curVertexIndex, U32 *indices, U32 &curIndiceIndex, BOOL firstBranch);

        void genVertexNormals(TreePart *part, LLStrider<LLVector3> &normals, U8 numSections, U32 curNormalOffset);

        void drawTree(LLDrawPool &draw_pool, const LLMatrix4 &frame, U8 level, F32 offsetChild, F32 curLength, F32 parentLength, F32 curRadius, F32 parentRadius, U8 part, U8 variant, U8 startSection);
        void drawTree(LLDrawPool &draw_pool);

        
        //LLTreeParams mParams;
        U8 mSpecies;
        LLPointer<LLViewerImage> mTreeImagep;
        LLMatrix4 mTrunkFlareFrames[MAX_FLARE];
        F32 mSegSplitsError[3];
        U32 mRandOffset[MAX_LEVELS];

        U32 mNumTrisDrawn;
        U32 mTotalIndices;
        U32 mTotalVerts;

        static void initClass();

        // tree params
        static LLTreeParams sParameters;

        // next indexes used to drawpool arrays
        static U32 sNextVertexIndex[MAX_SPECIES];
        static U32 sNextIndiceIndex[MAX_SPECIES];

        // tree parts
        static U32 sNextPartIndex[MAX_PARTS];
        static TreePart sTreeParts[MAX_SPECIES][MAX_PARTS];

        // species images
        static LLUUID sTreeImageIDs[MAX_SPECIES];

        // random numbers
        static F32 sRandNums[MAX_RAND_NUMS];

        // usage data
        static U32 sTreePartsUsed[MAX_SPECIES][MAX_PARTS][MAX_VARS];
        
        
};

#endif

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