OpenGL深度值+AABB包围盒

#include "StdAfx.h" #include "CLoad3DS.h" #pragma warning (disable: 4996) // 读入一个纹理 int CLoad3DS::BuildTexture(char *szPathName, GLuint &texid) { HDC hdcTemp; // The DC To Hold Our Bitmap HBITMAP hbmpTemp; // Holds The Bitmap Temporarily IPicture *pPicture; // IPicture Interface OLECHAR wszPath[MAX_PATH+1]; // Full Path To Picture (WCHAR) char szPath[MAX_PATH+1]; // Full Path To Picture long lWidth; // Width In Logical Units long lHeight; // Height In Logical Units long lWidthPixels; // Width In Pixels long lHeightPixels; // Height In Pixels GLint glMaxTexDim ; // Holds Maximum Texture Size if (strstr(szPathName, "http://")) // If PathName Contains http:// Then... { strcpy(szPath, szPathName); // Append The PathName To szPath } else // Otherwise... We Are Loading From A File { GetCurrentDirectory(MAX_PATH, szPath); // Get Our Working Directory strcat(szPath, "\\Data\\"); // Append "\" After The Working Directory strcat(szPath, szPathName); // Append The PathName } MultiByteToWideChar(CP_ACP, 0, szPath, -1, wszPath, MAX_PATH); // Convert From ASCII To Unicode HRESULT hr = OleLoadPicturePath(wszPath, 0, 0, 0, IID_IPicture, (void**)&pPicture); if(FAILED(hr)) // If Loading Failed return FALSE; // Return False hdcTemp = CreateCompatibleDC(GetDC(0)); // Create The Windows Compatible Device Context if(!hdcTemp) // Did Creation Fail? { pPicture->Release(); // Decrements IPicture Reference Count return FALSE; // Return False (Failure) } glGetIntegerv(GL_MAX_TEXTURE_SIZE, &glMaxTexDim); // Get Maximum Texture Size Supported pPicture->get_Width(&lWidth); // Get IPicture Width (Convert To Pixels) lWidthPixels = MulDiv(lWidth, GetDeviceCaps(hdcTemp, LOGPIXELSX), 2540); pPicture->get_Height(&lHeight); // Get IPicture Height (Convert To Pixels) lHeightPixels = MulDiv(lHeight, GetDeviceCaps(hdcTemp, LOGPIXELSY), 2540); // Resize Image To Closest Power Of Two if (lWidthPixels <= glMaxTexDim) // Is Image Width Less Than Or Equal To Cards Limit lWidthPixels = 1 << (int)floor((log((double)lWidthPixels)/log(2.0f)) + 0.5f); else // Otherwise Set Width To "Max Power Of Two" That The Card Can Handle lWidthPixels = glMaxTexDim; if (lHeightPixels <= glMaxTexDim) // Is Image Height Greater Than Cards Limit lHeightPixels = 1 << (int)floor((log((double)lHeightPixels)/log(2.0f)) + 0.5f); else // Otherwise Set Height To "Max Power Of Two" That The Card Can Handle lHeightPixels = glMaxTexDim; // Create A Temporary Bitmap BITMAPINFO bi = {0}; // The Type Of Bitmap We Request DWORD *pBits = 0; // Pointer To The Bitmap Bits bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); // Set Structure Size bi.bmiHeader.biBitCount = 32; // 32 Bit bi.bmiHeader.biWidth = lWidthPixels; // Power Of Two Width bi.bmiHeader.biHeight = lHeightPixels; // Make Image Top Up (Positive Y-Axis) bi.bmiHeader.biCompression = BI_RGB; // RGB Encoding bi.bmiHeader.biPlanes = 1; // 1 Bitplane // Creating A Bitmap This Way Allows Us To Specify Color Depth And Gives Us Imediate Access To The Bits hbmpTemp = CreateDIBSection(hdcTemp, &bi, DIB_RGB_COLORS, (void**)&pBits, 0, 0); if(!hbmpTemp) // Did Creation Fail? { DeleteDC(hdcTemp); // Delete The Device Context pPicture->Release(); // Decrements IPicture Reference Count return FALSE; // Return False (Failure) } SelectObject(hdcTemp, hbmpTemp); // Select Handle To Our Temp DC And Our Temp Bitmap Object // Render The IPicture On To The Bitmap pPicture->Render(hdcTemp, 0, 0, lWidthPixels, lHeightPixels, 0, lHeight, lWidth, -lHeight, 0); // Convert From BGR To RGB Format And Add An Alpha Value Of 255 for(long i = 0; i < lWidthPixels * lHeightPixels; i++) // Loop Through All Of The Pixels { BYTE* pPixel = (BYTE*)(&pBits[i]); // Grab The Current Pixel BYTE temp = pPixel[0]; // Store 1st Color In Temp Variable (Blue) pPixel[0] = pPixel[2]; // Move Red Value To Correct Position (1st) pPixel[2] = temp; // Move Temp Value To Correct Blue Position (3rd) // This Will Make Any Black Pixels, Completely Transparent (You Can Hardcode The Value If You Wish) if ((pPixel[0]==0) && (pPixel[1]==0) && (pPixel[2]==0)) // Is Pixel Completely Black pPixel[3] = 0; // Set The Alpha Value To 0 else // Otherwise pPixel[3] = 255; // Set The Alpha Value To 255 } glGenTextures(1, &texid); // Create The Texture // Typical Texture Generation Using Data From The Bitmap glBindTexture(GL_TEXTURE_2D, texid); // Bind To The Texture ID glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // (Modify This For The Type Of Filtering You Want) glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // (Modify This For The Type Of Filtering You Want) glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, lWidthPixels, lHeightPixels, 0, GL_RGBA, GL_UNSIGNED_BYTE, pBits); // (Modify This If You Want Mipmaps) DeleteObject(hbmpTemp); // Delete The Object DeleteDC(hdcTemp); // Delete The Device Context pPicture->Release(); // Decrements IPicture Reference Count return TRUE; // Return True (All Good) } // 构造函数的功能是初始化tChunk数据 CLoad3DS::CLoad3DS() { m_CurrentChunk = new tChunk; // 初始化并为当前的块分配空间 m_TempChunk = new tChunk; // 初始化一个临时块并分配空间 } // 打开一个3ds文件，读出其中的内容，并释放内存 bool CLoad3DS::Import3DS(t3DModel *pModel, char *strFileName) { char strMessage[255] = {0}; // 打开一个3ds文件 m_FilePointer = fopen(strFileName, "rb"); // 确保所获得的文件指针合法 if(!m_FilePointer) { sprintf(strMessage, "Unable to find the file: %s!", strFileName); MessageBox(NULL, strMessage, "Error", MB_OK); return false; } // 当文件打开之后，首先应该将文件最开始的数据块读出以判断是否是一个3ds文件 // 如果是3ds文件的话，第一个块ID应该是PRIMARY // 将文件的第一块读出并判断是否是3ds文件 ReadChunk(m_CurrentChunk); // 确保是3ds文件 if (m_CurrentChunk->ID != PRIMARY) { sprintf(strMessage, "Unable to load PRIMARY chuck from file: %s!", strFileName); MessageBox(NULL, strMessage, "Error", MB_OK); return false; } // 现在开始读入数据，ProcessNextChunk()是一个递归函数 // 通过调用下面的递归函数，将对象读出 ProcessNextChunk(pModel, m_CurrentChunk); // 在读完整个3ds文件之后，计算顶点的法线 ComputeNormals(pModel); // 释放内存空间 CleanUp(); return true; } // 下面的函数释放所有的内存空间，并关闭文件 void CLoad3DS::CleanUp() { fclose(m_FilePointer); // 关闭当前的文件指针 delete m_CurrentChunk; // 释放当前块 delete m_TempChunk; // 释放临时块 } // 下面的函数读出3ds文件的主要部分 void CLoad3DS::ProcessNextChunk(t3DModel *pModel, tChunk *pPreviousChunk) { t3DObject newObject = {0};