纹理贴图，opengl经典例子

#include <gl/glut.h> //引用相关包 #include <windows.h> #include <gl/glaux.h> #include <stdio.h> #pragma comment(lib, "openGL32.lib") #pragma comment(lib, "glu32.lib") #pragma comment(lib, "glaux.lib") GLfloat xrot; // X 旋转量 GLfloat yrot; // Y 旋转量 GLfloat zrot; // Z 旋转量 GLuint texture[1]; // 存储一个纹理 GLfloat xRot = 0.0f; GLfloat yRot = 0.0f; static int year = 0, day = 0; AUX_RGBImageRec *LoadBMP(CHAR *Filename) // 载入位图图象 { FILE *File=NULL; // 文件句柄 if (!Filename) // 确保文件名已提供 { return NULL; // 如果没提供，返回 NULL } File=fopen(Filename,"r"); // 尝试打开文件 if (File) // 文件存在么? { fclose(File); // 关闭句柄 return auxDIBImageLoadA(Filename); // 载入位图并返回指针 } return NULL; // 如果载入失败，返回 NULL } int LoadGLTextures() // 载入位图(调用上面的代码)并转换成纹理 { int Status=FALSE; // 状态指示器 AUX_RGBImageRec *TextureImage[1]; // 创建纹理的存储空间 memset(TextureImage,0,sizeof(void *)*1); // 将指针设为 NULL // 载入位图，检查有无错误，如果位图没找到则退出 if (TextureImage[0]=LoadBMP("pengchao.bmp")) { Status=TRUE; // 将 Status 设为 TRUE glGenTextures(1, &texture[0]); // 创建纹理 // 使用来自位图数据生成 的典型纹理 glBindTexture(GL_TEXTURE_2D, texture[0]); // 生成纹理 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); // 线形滤波 glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // 线形滤波 } if (TextureImage[0]) // 纹理是否存在 { if (TextureImage[0]->data) // 纹理图像是否存在 { free(TextureImage[0]->data); // 释放纹理图像占用的内存 } free(TextureImage[0]); // 释放图像结构 } return Status; // 返回 Status } void DrawCube(void) // 从这里开始进行所有的绘制 { //glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // 清除屏幕和深度缓存 glMatrixMode(GL_MODELVIEW); glLoadIdentity(); // 重置当前的模型观察矩阵 glTranslatef(0.0f,0.0f,-5.0f); // 移入屏幕 5 个单位 glRotatef(xRot,1.0f,0.0f,0.0f); // 绕X轴旋转 glRotatef(yRot,0.0f,1.0f,0.0f); // 绕Y轴旋转 glRotatef(zrot,0.0f,0.0f,1.0f); // 绕Z轴旋转 glBindTexture(GL_TEXTURE_2D, texture[0]); // 选择纹理 glBegin(GL_QUADS); // 前面 glNormal3f(0,0,1); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); // 纹理和四边形的左下 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); // 纹理和四边形的右下 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // 纹理和四边形的右上 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // 纹理和四边形的左上 // 后面 glNormal3f(0,0,-1); glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); // 纹理和四边形的右下 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); // 纹理和四边形的右上 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); // 纹理和四边形的左上 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); // 纹理和四边形的左下 // 顶面 glNormal3f(0,1,0); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); // 纹理和四边形的左上 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // 纹理和四边形的左下 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // 纹理和四边形的右下 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); // 纹理和四边形的右上 // 底面 glNormal3f(0,-1,0); glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f); // 纹理和四边形的右上 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f); // 纹理和四边形的左上 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); // 纹理和四边形的左下 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); // 纹理和四边形的右下 // 右面 glNormal3f(1,0,0); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); // 纹理和四边形的右下 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); // 纹理和四边形的右上 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // 纹理和四边形的左上 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); // 纹理和四边形的左下 // 左面 glNormal3f(-1,0,0); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); // 纹理和四边形的左下 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); // 纹理和四边形的右下 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // 纹理和四边形的右上 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); // 纹理和四边形的左上 glEnd(); } void SetupRC() { glMatrixMode(GL_PROJECTION); GLfloat mat_ambient[]= { 0.2f, 0.2f, 0.2f, 1.0f }; GLfloat mat_diffuse[]= { 0.8f, 0.8f, 0.8f, 1.0f }; GLfloat mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f }; GLfloat mat_shininess[] = { 50.0f }; //////////////////////// //GLfloat light_diffuse[]= { 0.0f, 0.0f, 1.0f, 1.0f}; //GLfloat position[] = { 3.0f, 3.0f, 3.0f, 1.0f }; GLfloat light_ambient[]={1.0f,1.0f,1.0f,1.0f}; GLfloat light_diffuse[]={1.0f,1.0f,0.0f,1.0f}; GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f }; GLfloat position[] = { -10.0f, 0.0f, 10.0f, 1.0f }; GLfloat spot_direction[]={ 1.0f, 1.0f, -1.0f}; GLfloat position1[] = { -10.0f, 0.0f, 10.0f, 1.0f }; //////////////////// //定义材质属性 glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); glMaterialfv(GL_FRONT, GL_SHININESS,mat_shininess); ////////////////////// glLightfv(GL_LIGHT0,GL_DIFFUSE,light_diffuse); glLightfv(GL_LIGHT0,GL_AMBIENT,light_ambient); glLightfv(GL_LIGHT0,GL_SPECULAR,light_specular); glLightfv (GL_LIGHT0, GL_POSITION, position); glLightf (GL_LIGHT0, GL_SPOT_CUTOFF, 120.0); glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION,spot_direction); glLightfv(GL_LIGHT1,GL_DIFFUSE,light_diffuse); glLightfv (GL_LIGHT1, GL_POSITION, position1); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); //glEnable(GL_LIGHT1); glEnable(GL_DEPTH_TEST); //glClearColor(1.0, 1.0, 1.0, 1.0); } void Sphere(void) { //glClear (GL_COLOR_BUFFER_BIT); //glColor3f (1.0, 1.0, 1.0); glPushMatrix(); glPushMatrix(); glRotatef ((GLfloat) year, 0.0, 1.5, 0.0); glTranslatef (-3.0, 0.0, 0.0); glRotatef ((GLfloat) day, 0.0, 1.0, 0.0); glColor3f(1.0,1.0,0.0); glutSolidSphere(0.5, 15, 12); /* draw sun */ glPopMatrix(); glRotatef ((GLfloat) year, 0.0, 1.5, 0.0); glTranslatef (3.0, 0.0, 0.0); glRotatef ((GLfloat) day, 0.0, 1.0, 0.0); glColor3f(1.0,1.0,0.0); glutWireSphere(0.2, 10, 8); /* draw smaller planet */ glPopMatrix(); day = (day + 10) % 360; year = (year + 1) % 360; } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // 清楚颜色数据和深度数据（清屏） SetupRC(); DrawCube(); Sphere(); //RenderScene(); // gluLookAt(xRot,yRot,0.0,0.0,0.0,0.0,0.0,0.0,0.0); // glPopMatrix(); glutSwapBuffers(); //交换缓冲区。显示图形 } //初始化 void init (void) { glClearColor (0.0f, 0.0f, 0.0f, 0.0f); //清理颜色，为黑色，（也可认为是背景颜色） glCullFace(GL_BACK); //背面裁剪(背面不可见) glEnable(GL_CULL_FACE); //启用裁剪 glEnable(GL_TEXTURE_2D); LoadGLTextures(); //载入纹理贴图 } //当窗口大小改变时，会调用这个函数 void reshape(GLsizei w,GLsizei h) { glViewport(0,0,w,h); //设置视口 glMatrixMode(GL_PROJECTION); //设置矩阵模式为投影变换矩阵， glLoadIdentity(); //变为单位矩阵 gluPerspective(80, (GLfloat)w / h, 1, 40); //设置投影矩阵 //gluPerspective(40.0f, (GLfloat) w/(GLfloat) h, 1.0f, 20.0f); glMatrixMode(GL_MODELVIEW); //设置矩阵模式为视图矩阵(模型)