void C3DSLoader::ReadNextObjChunk(t3DModel *pModel, t3DObject *pObject, tChunk *pPreChunk)
{
int buffer[50000] = {0};
m_CurrentChunk = new tChunk;
while (pPreChunk->bytesRead < pPreChunk->length)
{
ReadChunk(m_CurrentChunk);
switch (m_CurrentChunk->ID)
{
case OBJ_MESH:
ReadNextObjChunk(pModel, pObject, m_CurrentChunk);
break;
case OBJ_VERTICES:
ReadVertices(pObject, m_CurrentChunk);
break;
case OBJ_FACES:
ReadVertexIndices(pObject, m_CurrentChunk);
break;
case OBJ_MATERIAL:
ReadObjMat(pModel, pObject, m_CurrentChunk);
break;
case OBJ_UV:
ReadUVCoordinates(pObject, m_CurrentChunk);
break;
default:
m_CurrentChunk->bytesRead += fread(buffer, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
}
pPreChunk->bytesRead += m_CurrentChunk->bytesRead;
}
delete m_CurrentChunk;
m_CurrentChunk = pPreChunk;
}
// 下面的函数处理所有的文件中对象的信息
void CLoad3DS::ReadNextObjChunk(t3DModel *pModel, t3DObject *pObject, tChunk *pPreChunk)
{
int buffer[50000] = {0}; // 用于读入不需要的数据
// 对新的块分配存储空间
m_CurrentChunk = new tChunk;
// 继续读入块的内容直至本子块结束
while (pPreChunk->bytesRead < pPreChunk->length)
{ // 读入下一个块
ReadChunk(m_CurrentChunk);
// 区别读入是哪种块
switch (m_CurrentChunk->ID)
{
case OBJ_MESH: // 正读入的是一个新块
// 使用递归函数调用，处理该新块
ReadNextObjChunk(pModel, pObject, m_CurrentChunk);
break;
case OBJ_VERTICES: // 读入是对象顶点
ReadVertices(pObject, m_CurrentChunk);
break;
case OBJ_FACES: // 读入的是对象的面
ReadVertexIndices(pObject, m_CurrentChunk);
break;
case OBJ_MATERIAL: // 读入的是对象的材质名称
// 该块保存了对象材质的名称，可能是一个颜色，也可能是一个纹理映射。同时在该块中也保存了
// 纹理对象所赋予的面
// 下面读入对象的材质名称
ReadObjMat(pModel, pObject, m_CurrentChunk);
break;
case OBJ_UV: // 读入对象的UV纹理坐标
// 读入对象的UV纹理坐标
ReadUVCoordinates(pObject, m_CurrentChunk);
break;
default:
// 略过不需要读入的块
m_CurrentChunk->bytesRead += fread(buffer, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
}
// 添加从最后块中读入的字节数到前面的读入的字节中
pPreChunk->bytesRead += m_CurrentChunk->bytesRead;
}
// 释放当前块的内存空间，并把当前块设置为前面块
delete m_CurrentChunk;
m_CurrentChunk = pPreChunk;
}
void C3DSLoader::ReadNextChunk(t3DModel *pModel, tChunk *pPreChunk)
{
t3DObject newObject = {0};
tMatInfo newTexture = {0};
unsigned int version = 0;
int buffer[50000] = {0};
m_CurrentChunk = new tChunk;
while (pPreChunk->bytesRead < pPreChunk->length)
{
ReadChunk(m_CurrentChunk);
switch (m_CurrentChunk->ID)
{
case VERSION:
m_CurrentChunk->bytesRead += fread(&version, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
case OBJECTINFO:
ReadChunk(m_TempChunk);
m_TempChunk->bytesRead += fread(&version, 1, m_TempChunk->length - m_TempChunk->bytesRead, m_FilePointer);
m_CurrentChunk->bytesRead += m_TempChunk->bytesRead;
ReadNextChunk(pModel, m_CurrentChunk);
break;
case MATERIAL:
pModel->numOfMaterials++;
pModel->pMaterials.push_back(newTexture);
ReadNextMatChunk(pModel, m_CurrentChunk);
break;
case OBJECT:
pModel->numOfObjects++;
pModel->pObject.push_back(newObject);
memset(&(pModel->pObject[pModel->numOfObjects - 1]), 0, sizeof(t3DObject));
m_CurrentChunk->bytesRead += GetString(pModel->pObject[pModel->numOfObjects - 1].strName);
ReadNextObjChunk(pModel, &(pModel->pObject[pModel->numOfObjects - 1]), m_CurrentChunk);
break;
case EDITKEYFRAME:
m_CurrentChunk->bytesRead += fread(buffer, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
default:
m_CurrentChunk->bytesRead += fread(buffer, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
}
pPreChunk->bytesRead += m_CurrentChunk->bytesRead;
}
delete m_CurrentChunk;
m_CurrentChunk = pPreChunk;
}
void CLoad3DS::ReadNextChunk(t3DModel *pModel, tChunk *pPreChunk)
{
t3DObject newObject = {0}; // 用来添加到对象链表
tMatInfo newTexture = {0}; // 用来添加到材质链表
unsigned int version = 0; // 保存文件版本
int buffer[50000] = {0}; // 用来跳过不需要的数据
m_CurrentChunk = new tChunk; // 为新的块分配空间
// 下面每读一个新块，都要判断一下块的ID，如果该块是需要的读入的，则继续进行
// 如果是不需要读入的块，则略过
// 继续读入子块，直到达到预定的长度
while (pPreChunk->bytesRead < pPreChunk->length)
{
// 读入下一个块
ReadChunk(m_CurrentChunk);
// 判断块的ID号
switch (m_CurrentChunk->ID)
{
case VERSION: // 文件版本号
// 在该块中有一个无符号短整型数保存了文件的版本
// 读入文件的版本号，并将字节数添加到bytesRead变量中
m_CurrentChunk->bytesRead += fread(&version, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
// 如果文件版本号大于3，给出一个警告信息
if (version > 0x03)
MessageBox(NULL, "This 3DS file is over version 3 so it may load incorrectly", "Warning", MB_OK);
break;
case OBJECTINFO: // 网格版本信息
// 读入下一个块
ReadChunk(m_TempChunk);
// 获得网格的版本号
m_TempChunk->bytesRead += fread(&version, 1, m_TempChunk->length - m_TempChunk->bytesRead, m_FilePointer);
// 增加读入的字节数
m_CurrentChunk->bytesRead += m_TempChunk->bytesRead;
// 进入下一个块
ReadNextChunk(pModel, m_CurrentChunk);
break;
case MATERIAL: // 材质信息
// 材质的数目递增
pModel->numOfMaterials++;
// 在纹理链表中添加一个空白纹理结构
pModel->pMaterials.push_back(newTexture);
// 进入材质装入函数
ReadNextMatChunk(pModel, m_CurrentChunk);
break;
case OBJECT: // 对象的名称
// 该块是对象信息块的头部，保存了对象了名称
// 对象数递增
pModel->numOfObjects++;
// 添加一个新的tObject节点到对象链表中
pModel->pObject.push_back(newObject);
// 初始化对象和它的所有数据成员
memset(&(pModel->pObject[pModel->numOfObjects - 1]), 0, sizeof(t3DObject));
// 获得并保存对象的名称，然后增加读入的字节数
m_CurrentChunk->bytesRead += GetString(pModel->pObject[pModel->numOfObjects - 1].strName);
// 进入其余的对象信息的读入
ReadNextObjChunk(pModel, &(pModel->pObject[pModel->numOfObjects - 1]), m_CurrentChunk);
break;
case EDITKEYFRAME:
// 跳过关键帧块的读入，增加需要读入的字节数
m_CurrentChunk->bytesRead += fread(buffer, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
default:
// 跳过所有忽略的块的内容的读入，增加需要读入的字节数
m_CurrentChunk->bytesRead += fread(buffer, 1, m_CurrentChunk->length - m_CurrentChunk->bytesRead, m_FilePointer);
break;
}
// 增加从最后块读入的字节数
pPreChunk->bytesRead += m_CurrentChunk->bytesRead;
}
// 释放当前块的内存空间
delete m_CurrentChunk;
m_CurrentChunk = pPreChunk;
}
