计算机图形学-OpenGL纹理映射.doc

实验名称：OpenGL纹理映射（实验七） 班级：信09-1 学号：2108190911211 姓名：王杰 【实验目的】 1、掌握GLUT中多面体和二次曲面的生成 2、掌握基本纹理映射 【实验内容】 源程序 #include glut.h #include stdio.h #include windows.h #include fstream.h static GLuint texName; GLfloat angle=0; GLuint LoadBMPTo2DTexture(const char *pName, int nSize) { int m_nSizeImage; BITMAPFILEHEADER bmpFileHeader; BITMAPINFOHEADER bmpInfoHeader; ifstream bmpFile; bmpFile.open(pName, ios::binary); // be careful, here must be binary written. bmpFile.read((char*)bmpFileHeader, sizeof(BITMAPFILEHEADER)); bmpFile.read((char*)bmpInfoHeader, sizeof(BITMAPINFOHEADER)); if (bmpFileHeader.bfType != 0x4D42) // its not a bitmap file. return 0; unsigned char *pImage; int nTexSize; int nBytesPerPixel; nBytesPerPixel = bmpInfoHeader.biBitCount/8; nTexSize = nSize * nSize * nBytesPerPixel; pImage = new unsigned char[nTexSize]; memset(pImage, 0, nTexSize); m_nSizeImage = bmpFileHeader.bfSize - sizeof(BITMAPFILEHEADER) - sizeof(BITMAPINFOHEADER); bmpFile.read((char*)pImage, m_nSizeImage); /* Create texture */ GLuint texName; glGenTextures(1, texName); glBindTexture(GL_TEXTURE_2D, texName); /* Wrap parameter for texture coordinate s, t and r */ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); /* User linear filter for magnification / minification */ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); // The internal format use texture compress, frame rate raised from 20 to 40, // and save about 70Mb system memory. glTexImage2D(GL_TEXTURE_2D, /* target */ 0, /* MIPMAP level, 0 == base image */ GL_RGB,//GL_COMPRESSED_RGB_ARB,//GL_RGB, /* internal format */ nSize, nSize, 0, /* width of border */ GL_BGR_EXT, /* format of pixel data */ GL_UNSIGNED_BYTE, /* type of the pixel data */ pImage