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;
}
