Changeset 8724 in orxonox.OLD for trunk/src/lib/graphics/importer/md3/md3_model.cc

Timestamp:

Jun 22, 2006, 3:14:58 PM (19 years ago)

Author:

bensch

Message:

merged the bsp-model-stuff back here

File:

• trunk/src/lib/graphics/importer/md3/md3_model.cc (modified) (3 diffs)

trunk/src/lib/graphics/importer/md3/md3_model.cc

@@ -18 +18 @@
 
 #include "md3_data.h"
-
+#include "md3_mesh.h"
+#include "md3_tag.h"
+#include "md3_bone_frame.h"
+#include "md3_animation.h"
+
+#include "md3_animation_cfg.h"
+
+#include "material.h"
+#include "quaternion.h"
+
+#include "loading/resource_manager.h"
+
+#include "debug.h"
 
 namespace md3
@@ -28 +40 @@
   MD3Model::MD3Model(std::string filename, float scaling)
   {
-    this->md3Data = new MD3Data(filename, filename, scaling);
+    this->autoAssemblePlayerModel(filename, scaling);
+
+    this->bDrawBones = false;
+    this->bDrawNormals = false;
+
+    this->time = 0.0f;
+
+    // set the animation
+    this->interpolate(this->md3Data, this->config->getAnimation("Dead 1"), MD3_ANIM_NEXT, true);
   }
 
@@ -34 +54 @@
 
   MD3Model::~MD3Model()
+  {
+//     delete this->tmpBoneFrame;
+//     delete [] this->tmpMesh;
+
+    ///TODO deleting mesh
+    ///TODO deleting matrices
+  }
+
+
+  /**
+   * auto assemples a player model
+   * @param filename is the name to the directory of the modelzzzzzz
+   */
+  void MD3Model::autoAssemblePlayerModel(std::string filename, float scaling)
+  {
+    // loading the config file
+    std::string cfgName(filename + "/animation.cfg");
+    this->config = (MD3AnimationCfg*)ResourceManager::getInstance()->load(cfgName, MD3_CONFIG, RP_GAME);
+
+    //first load the torso or the upper part
+    std::string nameUpper(filename + "/upper.md3");
+    if( (this->md3Data = (MD3Data*)ResourceManager::getInstance()->load(nameUpper, MD3, RP_GAME, nameUpper, scaling)) == NULL)
+    {
+      std::string nameTorso(filename + "/torso.md3");
+      this->md3Data = (MD3Data*)ResourceManager::getInstance()->load(nameTorso, MD3, RP_GAME, nameTorso, scaling);
+    }
+
+    if( this->md3Data == NULL)
+    {
+      PRINTF(1)("Problems loading the MD3Model. Abording\n");
+      return;
+    }
+
+    // load lower
+    std::string nameLower(filename + "/lower.md3");
+    MD3Data* lower = (MD3Data*)ResourceManager::getInstance()->load(nameLower, MD3, RP_GAME, nameLower, scaling);
+    if( lower != NULL)
+    {
+      int tag = this->md3Data->getTagIndexByName("tag_lower");
+      PRINTF(0)("Loaded the %s model on index %i\n", nameLower.c_str(), tag);
+      if( tag >= 0)
+       this->md3Data->addLinkedModel(tag, lower);
+      else
+        PRINTF(0)("Could not add %s\n", nameLower.c_str());
+
+    }
+
+
+    // load head
+    std::string nameHead(filename + "/head.md3");
+    MD3Data* head = (MD3Data*)ResourceManager::getInstance()->load(nameHead, MD3, RP_GAME, nameLower, scaling);
+    if( head != NULL)
+    {
+      int tag = this->md3Data->getTagIndexByName("tag_head");
+      PRINTF(0)("Loaded the %s model on index %i\n", nameHead.c_str(), tag);
+      if( tag >= 0)
+        this->md3Data->addLinkedModel(tag, head);
+      else
+        PRINTF(0)("Could not add %s\n", nameHead.c_str());
+    }
+
+  }
+
+
+
+  /**
+   * tick float
+   * @param time: time elapsed
+   */
+  void MD3Model::tick(float time)
+  {
+    if(this->md3Data == NULL)
+      return;
+
+    this->visit(this->md3Data, time);
+
+    this->tick(time, this->md3Data);
+  }
+
+
+  /**
+   * tick each data
+   */
+  void MD3Model::tick(float time, MD3Data* data)
+  {
+    // draw the bones if needed#
+    if( this->bDrawBones)
+    {
+      // get bone frame, interpolate if necessary
+      if( data->animationState.interpolationFraction != 0.0 &&
+          data->animationState.currentFrame != data->animationState.nextFrame)
+      {
+        //interpolate bone frame
+        data->tmpBoneFrame = this->interpolateBoneFrame(data, data->boneFrames[data->animationState.currentFrame],
+                                                        data->boneFrames[data->animationState.nextFrame],
+                                                        data->animationState.interpolationFraction);
+      }
+      else
+      {
+        data->tmpBoneFrame = data->boneFrames[data->animationState.currentFrame];
+      }
+    }
+
+
+    //draw all meshes of current frame of this model
+    for( int i = 0;  i < data->header->meshNum; i++)
+    {
+      MD3Mesh* mesh = data->meshes[i];
+
+      //interpolate mesh frame between the 2 current mesh frames
+      if( data->header->boneFrameNum > 1)
+        this->interpolateMeshFrame( data,
+                                    mesh->meshFrames[data->animationState.currentFrame],
+                                    mesh->meshFrames[data->animationState.nextFrame],
+                                    data->animationState.interpolationFraction, mesh, i);
+      else
+        this->interpolateMeshFrame( data,
+                                    mesh->meshFrames[data->animationState.currentFrame],
+                                    mesh->meshFrames[data->animationState.currentFrame],
+                                    0.0f, mesh, i);
+
+      // draw vertex normals if needed
+      if( this->bDrawNormals)
+      {
+        // get vertex normals, interpolate if necessary
+        if( data->animationState.interpolationFraction != 0.0 &&
+            data->animationState.currentFrame != data->animationState.nextFrame)
+        {
+          //interpolate vertex normals
+          this->interpolateVertexNormals(data,
+                                         mesh->normals[data->animationState.currentFrame],
+                                         mesh->normals[data->animationState.nextFrame],
+                                         data->animationState.interpolationFraction, mesh, i);
+        }
+      }
+    }
+
+
+    // draw all models linked to this model
+    std::map<int, MD3Data*>::iterator it = data->sortedMap.begin();
+    int i = 0;
+    while( it != data->sortedMap.end())
+    {
+      MD3Data* child = it->second;
+
+      //build transformation array m from matrix, interpolate if necessary
+
+      MD3Tag* currFrameTag = data->boneFrames[data->animationState.currentFrame]->tags[child->parentTagIndex];
+
+      if( data->animationState.interpolationFraction != 0.0 &&
+          data->animationState.currentFrame != data->animationState.nextFrame)
+      {
+        //we need to interpolate
+        MD3Tag* nextFrameTag = data->boneFrames[data->animationState.nextFrame]->tags[child->parentTagIndex];
+        this->interpolateTransformation(child, currFrameTag, nextFrameTag, data->animationState.interpolationFraction, i);
+      }
+      else
+      {
+        //no interpolation needed, stay with last transformation
+        //OpenGL matrix is in column-major order
+        data->tmpMatrix[i][0] = currFrameTag->matrix[0][0];
+        data->tmpMatrix[i][1] = currFrameTag->matrix[1][0];
+        data->tmpMatrix[i][2] = currFrameTag->matrix[2][0];
+        data->tmpMatrix[i][3] = 0.0f;
+        data->tmpMatrix[i][4] = currFrameTag->matrix[0][1];
+        data->tmpMatrix[i][5] = currFrameTag->matrix[1][1];
+        data->tmpMatrix[i][6] = currFrameTag->matrix[2][1];
+        data->tmpMatrix[i][7] = 0.0f;
+        data->tmpMatrix[i][8] = currFrameTag->matrix[0][2];
+        data->tmpMatrix[i][9] = currFrameTag->matrix[1][2];
+        data->tmpMatrix[i][10]= currFrameTag->matrix[2][2];
+        data->tmpMatrix[i][11]= 0.0f;
+        data->tmpMatrix[i][12] = currFrameTag->position.x;
+        data->tmpMatrix[i][13] = currFrameTag->position.y;
+        data->tmpMatrix[i][14] = currFrameTag->position.z;
+        data->tmpMatrix[i][15] = 1.0f;
+      }
+
+      // switch to child coord system
+
+      // and tick child
+      this->tick(time, child);
+
+      i++;
+      it++;
+    }
+  }
+
+
+  /**
+   * this draws the md3 model
+   */
+  void MD3Model::draw() const
+  {
+    //draw current bone frame
+    this->draw(this->md3Data);
+  }
+
+
+  /**
+   * draw the md3model
+   * @param data: the data to be drawn
+   */
+  void MD3Model::draw(MD3Data* data) const
+  {
+
+    // draw the bones if needed
+    if( this->bDrawBones)
+    {
+      // get bone frame, interpolate if necessary
+      if( data->animationState.interpolationFraction != 0.0 &&
+          data->animationState.currentFrame != data->animationState.nextFrame) {
+        //interpolate bone frame
+        this->drawBoneFrame(data->tmpBoneFrame);
+      }
+      else {
+        //stick with current bone frame
+        this->drawBoneFrame(data->boneFrames[data->animationState.currentFrame]);
+      }
+    }
+
+
+    //draw all meshes of current frame of this model
+    for( int i = 0;  i < data->header->meshNum; i++)
+    {
+      MD3Mesh* mesh = data->meshes[i];
+      sVec3D* frame = data->tmpMesh[i];
+
+      if( mesh->header->textureNum > 0 && &mesh->material[0] != NULL)
+        mesh->material[0].select();
+
+      this->drawMesh(mesh, frame);
+
+      // draw vertex normals if needed
+      if( this->bDrawNormals)
+      {
+        // get vertex normals, interpolate if necessary
+        if( data->animationState.interpolationFraction != 0.0 &&
+            data->animationState.currentFrame != data->animationState.nextFrame)
+        {
+          //interpolate vertex normals
+          this->drawVertexNormals(frame, data->tmpNormal[i]);
+        }
+        else {
+          //stick with current vertex normals
+          this->drawVertexNormals(frame, mesh->normals[data->animationState.currentFrame]);
+        }
+      }
+    }
+
+
+    // draw all models linked to this model
+    int i = 0;
+    std::map<int, MD3Data*>::iterator it = data->sortedMap.begin();
+    while( it != data->sortedMap.end())
+    {
+      MD3Data* child = it->second;
+
+      //switch to child coord system
+      glPushMatrix();
+      glMultMatrixf(data->tmpMatrix[i]);
+
+      // and draw child
+      this->draw(child);
+
+      glPopMatrix();
+
+      i++;
+      it++;
+    }
+
+  }
+
+
+  /**
+   * draws the mesh
+   */
+  void MD3Model::drawMesh(MD3Mesh* mesh, sVec3D* frame) const
+  {
+    Vector tmpVec1, tmpVec2;
+
+    glColor3f(1.0f, 1.0f, 1.0f);
+    glBegin( GL_TRIANGLES);
+
+    // upload all triangles in the frame to OpenGL
+    for( int t = 0; t < mesh->header->triangleNum; t++)
+    {
+      // calc normal vector
+      tmpVec1.x = frame[mesh->triangles[t].vertexOffset[1]][0] - frame[mesh->triangles[t].vertexOffset[0]][0];
+      tmpVec1.y = frame[mesh->triangles[t].vertexOffset[1]][1] - frame[mesh->triangles[t].vertexOffset[0]][1];
+      tmpVec1.z = frame[mesh->triangles[t].vertexOffset[1]][2] - frame[mesh->triangles[t].vertexOffset[0]][2];
+
+      tmpVec2.x = frame[mesh->triangles[t].vertexOffset[2]][0] - frame[mesh->triangles[t].vertexOffset[0]][0];
+      tmpVec2.y = frame[mesh->triangles[t].vertexOffset[2]][1] - frame[mesh->triangles[t].vertexOffset[0]][1];
+      tmpVec2.z = frame[mesh->triangles[t].vertexOffset[2]][2] - frame[mesh->triangles[t].vertexOffset[0]][2];
+
+      Vector normal = tmpVec1.cross(tmpVec2);
+      normal.normalize();
+
+//       PRINTF(0)("normal: %f, %f, %f\n", normal.x, normal.y, normal.z);
+
+      glNormal3f(normal.x, normal.y, normal.z);
+      glTexCoord2fv( mesh->texVecs[mesh->triangles[t].vertexOffset[0]].textureCoord);
+      glVertex3f( frame[mesh->triangles[t].vertexOffset[0]][0],
+                  frame[mesh->triangles[t].vertexOffset[0]][2],
+                  frame[mesh->triangles[t].vertexOffset[0]][1]);
+
+      glNormal3f(normal.x, normal.y, normal.z);
+      glTexCoord2fv( mesh->texVecs[mesh->triangles[t].vertexOffset[1]].textureCoord);
+      glVertex3f( frame[mesh->triangles[t].vertexOffset[1]][0],
+                  frame[mesh->triangles[t].vertexOffset[1]][2],
+                  frame[mesh->triangles[t].vertexOffset[1]][1]);
+
+      glNormal3f(normal.x, normal.y, normal.z);
+      glTexCoord2fv( mesh->texVecs[mesh->triangles[t].vertexOffset[2]].textureCoord);
+      glVertex3f( frame[mesh->triangles[t].vertexOffset[2]][0],
+                  frame[mesh->triangles[t].vertexOffset[2]][2],
+                  frame[mesh->triangles[t].vertexOffset[2]][1]);
+    }
+    glEnd();
+  }
+
+
+  /**
+   *  drawo vertex normals
+   */
+  void MD3Model::drawVertexNormals(sVec3D* frame, MD3Normal* normals) const
   {}
 
 
+  /**
+   * draw bone frame
+   */
+  void MD3Model::drawBoneFrame(MD3BoneFrame* frame) const
+  {
+    float x1 = frame->mins.x;
+    float y1 = frame->mins.y;
+    float z1 = frame->mins.z;
+    float x2 = frame->maxs.x;
+    float y2 = frame->maxs.y;
+    float z2 = frame->maxs.z;
+
+    glPushAttrib(GL_TEXTURE_2D);
+    glPushAttrib(GL_LIGHTING);
+
+    glColor3f(1.0f,0.0f,0.0f);
+    glPointSize(6.0f);
+
+    glBegin(GL_POINTS);
+    glVertex3f(frame->position.x, frame->position.y, frame->position.z);
+    glEnd();
+    glPointSize(1.0f);
+
+    glColor3f(0.0f,1.0f,0.0f);
+    glBegin(GL_LINE_LOOP);
+    glVertex3f(x1,y1,z1);
+    glVertex3f(x1,y1,z2);
+    glVertex3f(x1,y2,z2);
+    glVertex3f(x1,y2,z1);
+    glEnd();
+
+    glBegin(GL_LINE_LOOP);
+    glVertex3f(x2,y2,z2);
+    glVertex3f(x2,y1,z2);
+    glVertex3f(x2,y1,z1);
+    glVertex3f(x2,y2,z1);
+    glEnd();
+
+    glBegin(GL_LINES);
+    glVertex3f(x1,y1,z1);
+    glVertex3f(x2,y1,z1);
+
+    glVertex3f(x1,y1,z2);
+    glVertex3f(x2,y1,z2);
+
+    glVertex3f(x1,y2,z2);
+    glVertex3f(x2,y2,z2);
+
+    glVertex3f(x1,y2,z1);
+    glVertex3f(x2,y2,z1);
+    glEnd();
+
+     glPopAttrib();
+     glPopAttrib();
+  }
+
+
+  /**
+   *  interpolate bone frame
+   * @param currBoneFrame Start bone frame.
+   * @param nextBoneFrame End bone frame.
+   * @param frac Interpolation fraction, in [0,1].
+   */
+  MD3BoneFrame* MD3Model::interpolateBoneFrame(MD3Data* data, MD3BoneFrame* currBoneFrame, MD3BoneFrame* nextBoneFrame, float frac)
+  {
+    data->tmpBoneFrame->mins.x      = (1.0f - frac) * currBoneFrame->mins.x       + frac * nextBoneFrame->mins.x;
+    data->tmpBoneFrame->maxs.x      = (1.0f - frac) * currBoneFrame->maxs.x       + frac * nextBoneFrame->maxs.x;
+    data->tmpBoneFrame->position.x  = (1.0f - frac) * currBoneFrame->position.x   + frac * nextBoneFrame->position.x;
+    data->tmpBoneFrame->mins.y      = (1.0f - frac) * currBoneFrame->mins.y       + frac * nextBoneFrame->mins.y;
+    data->tmpBoneFrame->maxs.y      = (1.0f - frac) * currBoneFrame->maxs.y       + frac * nextBoneFrame->maxs.y;
+    data->tmpBoneFrame->position.y  = (1.0f - frac) * currBoneFrame->position.y   + frac * nextBoneFrame->position.y;
+    data->tmpBoneFrame->mins.z      = (1.0f - frac) * currBoneFrame->mins.z       + frac * nextBoneFrame->mins.z;
+    data->tmpBoneFrame->maxs.z      = (1.0f - frac) * currBoneFrame->maxs.z       + frac * nextBoneFrame->maxs.z;
+    data->tmpBoneFrame->position.z  = (1.0f - frac) * currBoneFrame->position.z   + frac * nextBoneFrame->position.z;
+
+    return data->tmpBoneFrame;
+  }
+
+
+
+  /**
+   * interpolate mesh frame
+   */
+  sVec3D* MD3Model::interpolateMeshFrame(MD3Data* data, sVec3D* currMeshFrame, sVec3D* nextMeshFrame, float frac, MD3Mesh* mesh, int i)
+  {
+    int vertexNum = mesh->header->vertexNum;
+
+    if( /*frac == 0.0f*/ true)
+    {
+      // just copy the vertices
+      for( int t = 0; t < vertexNum; t++)
+      {
+        data->tmpMesh[i][t][0]  = currMeshFrame[t][0];
+        data->tmpMesh[i][t][1]  = currMeshFrame[t][1];
+        data->tmpMesh[i][t][2]  = currMeshFrame[t][2];
+      }
+    }
+    else
+    {
+      // calc interpolated vertices
+      for( int t = 0; t < vertexNum; t++)
+      {
+        data->tmpMesh[i][t][0]  = (1.0f - frac)   * currMeshFrame[t][0]  + frac * nextMeshFrame[t][0];
+        data->tmpMesh[i][t][1]  = (1.0f - frac)   * currMeshFrame[t][1]  + frac * nextMeshFrame[t][1];
+        data->tmpMesh[i][t][2]  = (1.0f - frac)   * currMeshFrame[t][2]  + frac * nextMeshFrame[t][2];
+      }
+    }
+
+    return data->tmpMesh[i];
+  }
+
+
+  /**
+   * interpolate vertex normal
+   */
+  MD3Normal* MD3Model::interpolateVertexNormals(MD3Data* data, MD3Normal* currNormals, MD3Normal* nextNormals, float frac, MD3Mesh* mesh, int i)
+  {
+    for( int j = 0; j < mesh->header->vertexNum; j++)
+    {
+      data->tmpNormal[i][j].vertexNormal[0] = (int)((1.0f - frac) * currNormals[j].vertexNormal[0] + frac * nextNormals[j].vertexNormal[0]);
+      data->tmpNormal[i][j].vertexNormal[1] = (int)((1.0f - frac) * currNormals[j].vertexNormal[1] + frac * nextNormals[j].vertexNormal[1]);
+    }
+
+    return data->tmpNormal[i];
+  }
+
+
+  /**
+   * interpolate transformation
+   */
+  float* MD3Model::interpolateTransformation(MD3Data* data, MD3Tag* currFrameTag, MD3Tag* nextFrameTag, float frac, int i)
+  {
+    // interpolate position
+    Vector interpolatedPosition = currFrameTag->position * (1.0f - frac) + nextFrameTag->position * frac;
+
+
+    // interpolate rotation matrix
+    float  currRot[4][4];
+    float  nextRot[4][4];
+    float  interpolatedMatrix[4][4];
+
+    Quaternion currQuat(currFrameTag->matrix); currQuat.matrix(currRot);
+    Quaternion nextQuat(nextFrameTag->matrix); nextQuat.matrix(nextRot);
+
+    Quaternion interpolatedQuat = Quaternion::quatSlerp(currQuat, nextQuat, frac); interpolatedQuat.matrix(interpolatedMatrix);
+
+    // quaternion code is column based, so use transposed matrix when spitting out to gl
+    data->tmpMatrix[i][0] = interpolatedMatrix[0][0];
+    data->tmpMatrix[i][4] = interpolatedMatrix[1][0];
+    data->tmpMatrix[i][8] = interpolatedMatrix[2][0];
+    data->tmpMatrix[i][12] = interpolatedPosition.x;
+    data->tmpMatrix[i][1] = interpolatedMatrix[0][1];
+    data->tmpMatrix[i][5] = interpolatedMatrix[1][1];
+    data->tmpMatrix[i][9] = interpolatedMatrix[2][1];
+    data->tmpMatrix[i][13] = interpolatedPosition.y;
+    data->tmpMatrix[i][2] = interpolatedMatrix[0][2];
+    data->tmpMatrix[i][6] = interpolatedMatrix[1][2];
+    data->tmpMatrix[i][10]= interpolatedMatrix[2][2];
+    data->tmpMatrix[i][14] = interpolatedPosition.z;
+    data->tmpMatrix[i][3] = 0.0f;
+    data->tmpMatrix[i][7] = 0.0f;
+    data->tmpMatrix[i][11]= 0.0f;
+    data->tmpMatrix[i][15] = 1.0f;
+
+    return data->tmpMatrix[i];
+
+  }
+
+
+
+  /**
+   * visit the model
+   */
+  void MD3Model::visit(MD3Data* data, float time)
+  {
+    if ( (data->filename.find("lower") == std::string::npos &&
+          (data->animation->type == LEGS || data->animation->type == BOTH)) // this is the LEGS model and the animation is applicable
+          ||
+          (data->filename.find("upper") == std::string::npos &&
+          (data->animation->type == TORSO || data->animation->type == BOTH)) // this is the TORSO model and the animation is applicable
+          ||
+          data->animation->type == ALL // the animation is allways applicable
+       )
+      this->doOp(data, time);
+
+    // visit children
+//     std::map<int, MD3Data*>::iterator it = data->sortedMap.begin();
+//     while( it != data->sortedMap.end())
+//     {
+//       this->visit(it->second);
+//       it++;
+//     }
+  }
+
+
+  /**
+   * Create a new visitor to apply an animation operation (NEXT, REWIND, ...)
+   * to a MD3 model. The operation is executed in the context of the specified
+   * animation.
+   *
+   * @param anim The animation that provides the context for the operation.
+   * @param op The operation to apply.
+   * @param interpolate Should interpolation be done?
+   */
+  void MD3Model::interpolate(MD3Data* data, MD3Animation* anim, int op, bool bInterpolate)
+  {
+     data->animation = anim;
+     if( op == MD3_ANIM_NEXT || op == MD3_ANIM_PREVIOUS || op == MD3_ANIM_REWIND)
+      data->op = op;
+
+     data->bInterpolate = bInterpolate;
+  }
+
+
+  /**
+   * calc next frame number
+   */
+  int MD3Model::next(MD3Data* data, int nr)
+  {
+    if( nr < (data->upperBound - 1))
+      return nr + 1;
+    else
+    { //rewind needed
+      if( data->animation->numFrames < 0)
+        return data->animation->first;
+      else {
+        nr = (data->animation->numLoopFrames != 0)?(data->animation->numFrames - data->animation->numLoopFrames):0;
+        return data->animation->first + nr;
+      }
+    }
+  }
+
+
+  /**
+   * calc prev frame number
+   */
+  int MD3Model::prev(MD3Data* data, int nr)
+  {
+    if( nr == data->animation->first)
+      return data->upperBound - 1;
+    else
+      return nr - 1;
+  }
+
+
+  /**
+   * apply the specified operation to the animation state data members of the model
+   * taking the specified animation into account
+   *
+   * @param data: the data of the model
+   */
+  void MD3Model::doOp(MD3Data* data, float time)
+  {
+    // animation to be applied could have illegal data with respect to this model,
+    // ignore anim in this case
+
+    if( data->animation->first >= data->animation->numFrames || data->animation->first < 0)
+    {
+      PRINTF(0)("MD3: this animation type seems to be invalid, no animation calculated\n");
+      return;
+    }
+
+
+    //calc upper bound for animation frames in this model
+    if( data->animation->numFrames < 0)
+      data->upperBound = data->header->boneFrameNum; //use all available frames
+    else
+    {
+      if( data->header->boneFrameNum < (data->animation->first + data->animation->numFrames))
+        data->upperBound = data->header->boneFrameNum;
+      else
+        data->upperBound = (data->animation->first + data->animation->numFrames);
+    }
+
+
+    switch( data->op) {
+
+      case MD3_ANIM_NEXT:
+        if( data->bInterpolate)
+        {
+          // keyframe interpolation animation
+          data->animationState.interpolationFraction += time * data->animation->fps;
+
+          if( data->animationState.interpolationFraction >= 1.0f)
+          {
+            data->animationState.currentFrame = data->animationState.nextFrame;
+            data->animationState.nextFrame = next(data, data->animationState.nextFrame);
+            data->animationState.interpolationFraction = 0.0f;
+          }
+        }
+        else
+        {
+          // only keyframe animation
+          this->time += time * data->animation->fps;
+          if( this->time > 1.0f)
+          {
+            data->animationState.currentFrame = data->animationState.nextFrame;
+            data->animationState.nextFrame = next(data, data->animationState.nextFrame);
+            this->time = 0.0f;
+          }
+        }
+        break;
+
+      case MD3_ANIM_PREVIOUS:
+        if( data->bInterpolate)
+        {
+          data->animationState.interpolationFraction -= time / data->animation->fps;
+          if( data->animationState.interpolationFraction < 0.0f)
+          {
+            data->animationState.nextFrame = data->animationState.currentFrame;
+            data->animationState.currentFrame = prev(data, data->animationState.currentFrame);
+            data->animationState.interpolationFraction = 0.8f;
+          }
+        }
+        else
+        {
+          data->animationState.nextFrame = data->animationState.currentFrame;
+          data->animationState.currentFrame = prev(data, data->animationState.currentFrame);
+        }
+        break;
+
+      case MD3_ANIM_REWIND:
+        data->animationState.currentFrame = data->animation->first;
+        data->animationState.nextFrame = next(data, data->animationState.currentFrame);
+        data->animationState.interpolationFraction = 0.0f;
+        break;
+    }
+
+  }
+
+
 }