计算机图形学实验报告--纹理映射

计算机图形学实验报告 实验名称： 纹理映射创建 学号 姓名 指导老师： 成绩： 教师评语： 实验内容： 创建一个正方体并使其坐标变幻 关键代码：（加注释） AUX_RGBImageRec *LoadBMP(char *Filename)// Loads A Bitmap Image { FILE *File=NULL; // File Handle if (!Filename) // Make Sure A Filename Was Given { return NULL; // If Not Return NULL } File=fopen(Filename,"r"); // Check To See If The File Exists if (File) // Does The File Exist? { fclose(File); // Close The Handle return auxDIBImageLoad(Filename) // Load The Bitmap And Return A Pointer } return NULL // If Load Failed Return NULL } int LoadGLTextures() // Load Bitmaps And Convert To Textures { int Status=FALSE; // Status Indicator AUX_RGBImageRec *TextureImage[2] // Create Storage Space For The Texture memset(TextureImage,0,sizeof(void *)*1); // Set The Pointer To NULL //Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit if (TextureImage[0]=LoadBMP("Data/Crate.bmp")) { Status=TRUE; // Set The Status To TRUE glGenTextures(1, &texture[0]) // Create The Texture // Typical Texture Generation Using Data From The Bitmap glBindTexture(GL_TEXTURE_2D, texture[0]); glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); } 重要数据结构或类： CreateGLWindow（） DrawGLScene(GLvoid) InitGL(GLvoid) KillGLWindow(GLvoid) ReSizeGLScene() WinMain（） WndProc（） HGLRC hRC=NULL;// 窗口着色描述表句柄 HDC hDC=NULL;// OpenGL渲染描述表句柄 HWND hWnd=NULL // 保存我们的窗口句柄 HINSTANCE hInstance;// 保存程序的实例 bool keys[256];// 保存键盘按键的数组 bool active=TRUE; // 窗口的活动标志，缺省为TRUE bool fullscreen=TRUE;// 全屏标志缺省，缺省设定成全屏模式 GLfloat rtri GLfloat rquad;

AUX_RGBImageRec *LoadBMP(char *Filename) LoadGLTextures() if (TextureImage[0]) // If Texture Exists {if (TextureImage[0]->data) // If Texture Image Exists { free(TextureImage[0]->data) // Free The Texture Image Memory } free(TextureImage[0]); // Free The Image Structure } if (TextureImage[1]=LoadBMP("Data/NeHe.bmp")) { Status=TRUE; // Set The Status To T glGenTextures(1, &texture[1]) // Create The Texture // Typical Texture Generation Using Data From The Bitmap glBindTexture(GL_TEXTURE_2D, texture[1]); glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[1]->sizeX, TextureImage[1]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[1]->data); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); } if (TextureImage[1]) // If Texture Exists { if (TextureImage[1]->data) // If Texture Image Exists { free(TextureImage[1]->data);// Free The Texture Image Memory } free(TextureImage[1]); // Free The Image Structure } return Status // Return The Status }

DrawGLScene(GLvoid) // 从这里开始进行所有的绘制 { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // 清除屏幕及深度缓存 glLoadIdentity(); glTranslatef(-1.0f,0.0f,-8.0f); // 先右移再移入屏幕

glRotatef(x,1.0f,0.0f,0.0f); // 在X轴上旋转立方体 glRotatef(y,0.0f,1.0f,0.0f); // 在Y轴上旋转立方体 glRotatef(z,0.0f,1.0f,1.0f); // 在YZ轴上旋转立方体

glBindTexture(GL_TEXTURE_2D, texture[0]); glBegin(GL_QUADS);

流程图： 创建窗口

修改窗口大小 读取图片文件 存储纹理

载入图片 创建纹理

创建模型并使其坐标变换

销毁窗口 // Front Face glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glEnd(); glBindTexture(GL_TEXTURE_2D,texture[0]); glBegin(GL_QUADS); // Back Face glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[1]); glBegin(GL_QUADS); // Top Face glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[2]); glBegin(GL_QUADS); // Bottom Face glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[3]); glBegin(GL_QUADS); // Right face glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[4]); glBegin(GL_QUADS); // Left Face glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);