skeleton.cpp

本程序描述的是一个三维织物动感模拟系统。计算机生成真实感服装被列入计算机图形学亟需解决的三大问题之一。

///////////////////////////////////////////////////////////////////////////////
//
// Skeleton.cpp : Animation System Skeleton supprt file
//
// Purpose:	Structure Supprt routines for Hierarchical Animation System
//
// I DIDN'T PUT THESE IN A C++ CLASS FOR CROSS PLATFORM COMPATIBILITY
// SINCE THE ENGINE MAY BE IMPLEMENTED ON CONSOLES AND OTHER SYSTEMS
//
// Created:
//		JL 9/1/97		
//
///////////////////////////////////////////////////////////////////////////////
//
//	Copyright 1997 Jeff Lander, All Rights Reserved.
//  For educational purposes only.
//  Please do not republish in electronic or print form without permission
//  Thanks - [e-mail]
//
///////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "skeleton.h"

void DestroySkeleton(t_Bone *root)
{
///  局部变量定义  ///////////////////////////////////////////////////////////
	int loop;
	t_Bone *child;
///////////////////////////////////////////////////////////////////////////////
	if (root->childCnt > 0)
	{
		child = root->children;
		for (loop = 0; loop < root->childCnt; loop++,child++)
		{
			if (child->childCnt > 0)
				DestroySkeleton(child);
			if (child->primChannel > NULL)
			{
				child->primChannel = NULL;
			}
			if (child->visualCnt > 0)
			{
				free(child->visuals->vertexData);
				if (child->visuals->faceIndex)
					free(child->visuals->faceIndex);
				free(child->visuals);
			}
		}
		free(root->children);
	}

	root->primChanType = CHANNEL_TYPE_NONE;
	root->secChanType = CHANNEL_TYPE_NONE;
	root->primFrameCount = 0;
	root->secFrameCount = 0;
	root->primCurFrame = 0;
	root->secCurFrame = 0;
	root->primChannel = NULL;
	root->secChannel = NULL;

	if (root->visualCnt > 0)
	{
		free(root->visuals->vertexData);
		if (root->visuals->faceIndex)
			free(root->visuals->faceIndex);
		free(root->visuals);
	}
	root->visualCnt = 0;
	root->visuals = NULL;
	root->childCnt = 0;	
	root->children = NULL;
}

void ResetBone(t_Bone *bone,t_Bone *parent)
{
	bone->b_scale.x =
	bone->b_scale.y =
	bone->b_scale.z = 1.0;
	bone->scale.x =
	bone->scale.y =
	bone->scale.z = 1.0;

	bone->b_rot.x =
	bone->b_rot.y =
	bone->b_rot.z = 0.0;
	bone->rot.x =
	bone->rot.y =
	bone->rot.z = 0.0;

	bone->b_trans.x =
	bone->b_trans.y =
	bone->b_trans.z = 0.0;
	bone->trans.x =
	bone->trans.y =
	bone->trans.z = 0.0;

	bone->primChanType = CHANNEL_TYPE_NONE;
	bone->secChanType = CHANNEL_TYPE_NONE;
	bone->primFrameCount = 0;
	bone->secFrameCount = 0;
	bone->primCurFrame = 0;
	bone->secCurFrame = 0;
	bone->primChannel = NULL;
	bone->secChannel = NULL;

	bone->visualCnt = 0;
	bone->visuals = NULL;
	bone->childCnt = 0;	
	bone->children = NULL;	
	bone->parent = parent;
}

void BoneSetFrame(t_Bone *bone,int frame)
{
///  局部变量定义 ///////////////////////////////////////////////////////////
	float *offset;
///////////////////////////////////////////////////////////////////////////////

	if (bone->primChannel != NULL)
	{
		offset = (float *)(bone->primChannel + (s_Channel_Type_Size[bone->primChanType] * frame));

		switch (bone->primChanType)
		{
		case CHANNEL_TYPE_SRT:
			bone->trans.x = offset[0];
			bone->trans.y = offset[1];
			bone->trans.z = offset[2];

			bone->rot.x = offset[3];
			bone->rot.y = offset[4];
			bone->rot.z = offset[5];

			bone->scale.x = offset[6];
			bone->scale.y = offset[7];
			bone->scale.z = offset[8];
			break;

		}
	}
}

void BoneAdvanceFrame(t_Bone *bone,int direction,BOOL doChildren)
{
///  局部变量定义 ///////////////////////////////////////////////////////////
	int loop;
	t_Bone *child;
///////////////////////////////////////////////////////////////////////////////
	if (bone->childCnt > 0)
	{
		child = bone->children;
		for (loop = 0; loop < bone->childCnt; loop++,child++)
		{
			child->primCurFrame += direction;
			if (child->primCurFrame >= child->primFrameCount)
				child->primCurFrame = 0;
			if (child->primCurFrame < 0)
				child->primCurFrame += child->primFrameCount;
			BoneSetFrame(child,(int)child->primCurFrame);
			if (doChildren && child->childCnt > 0)	
				BoneAdvanceFrame(child,direction,doChildren);
		}
	}
}