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/home/rdbrown/doxygen/cse125g1/src/modules/actor/Animation.cpp

#include "Animation.h"

void Animation::Load(Tokenizer &tokens)
{
        char temp[64];
        tokens.FindToken("keyframes");
        numKeys = tokens.GetInt();

        bool rootTranslation = false;
        tokens.GetToken(temp);
        if(strcmp(temp,"roottranslation") == 0)
        {
                rootTranslation = true;
                tokens.FindToken("endtype");
        }
        pose.SetRootTranslation(rootTranslation);
        endType = (enum AnimEndType)tokens.GetInt();

        tokens.FindToken("numbones");
        numBones = tokens.GetInt();
        keyRate = 0.03333f;
        pose.Init(numBones);

        keyFrames = new AnimPose[numKeys];
        
        for(int key = 0; key < numKeys; key++)
        {
                keyFrames[key].Init(numBones);
                tokens.FindToken("time");
                float t = tokens.GetFloat();
                //ignore the t in the file for now
                keyFrames[key].SetTime(key*keyRate);
                keyFrames[key].SetRootTranslation(rootTranslation);

                Vector3 *currKey = keyFrames[key].GetPose();
                if(rootTranslation)
                {
                        float x = tokens.GetFloat() * 0.0533;
                        float y = tokens.GetFloat() * 0.0533;
                        float z = tokens.GetFloat() * 0.0533;
                        keyFrames[key].SetRootPos(x,y,z);
                }
                for(int bone = 0; bone < numBones; bone++)
                {
                        float x = tokens.GetFloat();
                        float y = tokens.GetFloat();
                        float z = tokens.GetFloat();
                        currKey[bone].Set(x,y,z);
                }
        }
}

AnimPose *Animation::GetPose(float time)
{
        int key0, key1;
        float tdiff, percent;
        //see if animation is 'done'
        done = false;
        if(time > (numKeys * keyRate))
        {
                if(endType == ANIM_END_HOLD || endType == ANIM_END_STOP)
                {
                        key0 = numKeys - 1;
                        key1 = 0;
                        tdiff = percent = 0.0f;
                }
                else //if(endType == ANIM_END_LOOP)
                {
                        key0 = (int)floorf(time/keyRate) % numKeys;
                        key1 = (int)ceilf(time/keyRate) % numKeys;
                        tdiff = fmodf(time,(float)numKeys*keyRate) - keyFrames[key0].GetTime();
                        percent = tdiff/keyRate;
                }
                if(endType == ANIM_END_STOP)
                        done = true;
        }
        else
        {
                key0 = (int)floorf(time/keyRate) % numKeys;
                key1 = (int)ceilf(time/keyRate) % numKeys;
                tdiff = fmodf(time,(float)numKeys*keyRate) - keyFrames[key0].GetTime();
                percent = tdiff/keyRate;
        }

        pose.SetTime(time);

        Vector3 *pose0 = keyFrames[key0].GetPose();
        Vector3 *pose1 = keyFrames[key1].GetPose();
        Vector3 *newPose = pose.GetPose();
        if(pose.GetRootTranslation())
        {
                Vector3 r0 = keyFrames[key0].GetRootPos();
                Vector3 r1 = keyFrames[key1].GetRootPos();
                pose.SetRootPos(r0.x + (percent * (r1.x - r0.x)),
                                                r0.y + (percent * (r1.y - r0.y)),
                                                r0.z + (percent * (r1.z - r0.z)));
        }

        for(int i = 0; i < numBones; i++)
        {
                newPose[i].x = pose0[i].x + (percent * (pose1[i].x - pose0[i].x));
                newPose[i].y = pose0[i].y + (percent * (pose1[i].y - pose0[i].y));
                newPose[i].z = pose0[i].z + (percent * (pose1[i].z - pose0[i].z));
        }

        return &pose;
}

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