opengl-立方体变换、纹理、鼠标事件响应等

#include "CubeOperate.h" CubeVector cubev; //立方体变量 GLuint texture[6]; Image *image[6]; //图片 Plane planeAll[6]; //六个平面 GLfloat ModelViewMatrix[16] = {1.0,0.0,0.0,0.0, 0.0,1.0,0.0,0.0, 0.0,0.0,1.0,0.0, 0.0,0.0,0.0,1.0}; //模型视图变换矩阵,初始化为单位矩阵 Point pointCurrentState[8]; //八个点当前状态状态 Point IntersectionPoint[6]; //观察点和鼠标的连线与六个面的交点 Point eyepoint ; //经过鼠标点，垂直与近裁截面的直线的一个点 Point mousepoint; //用来保存鼠标点击的点的三维坐标 BOOL Tag[6]; //用来表示六个交点是否在面上，在则true,否则false char *pictures[]={ //图片路径 "pictures/1.bmp", "pictures/2.bmp", "pictures/3.bmp", "pictures/4.bmp", "pictures/5.bmp", "pictures/6.bmp" }; int ImageLoad(char *filename,Image *image) //读取bmp格式的图片到image { FILE *fp; unsigned long size; // 图片长度 unsigned long i; // 计数 unsigned short int planes; unsigned short int bpp; char temp; // bgr -rgb 变换 if ((fp = fopen(filename, "rb")) == NULL) //打开文件 { printf("File Not Found: %s\n", filename); return 0; } fseek(fp, 18, SEEK_CUR); // 跳过文件的头部，准备读取宽度和高度 if ((i = fread(&image->width, 4, 1, fp)) != 1) // 读取宽度 { printf("Error reading width from %s. \n", filename); return 0; } printf("Width of %s: %lu\n", filename, image->width); if ((i = fread(&image->length, 4, 1, fp)) != 1) // 读取宽度 { printf("Error reading height from %s. \n", filename); return 0; } printf("Height of %s: %lu\n", filename, image->length); size = image->width * image->length * 3; // 计算长度(24bits或3bytes每个像素) // 读取 if ((fread(&planes, 2, 1, fp)) != 1) { printf("Error reading planes from %s. \n", filename); return 0; } if (planes != 1) { printf("Planes from %s is not 1: %u\n", filename, planes); return 0; } if ((i = fread(&bpp, 2, 1, fp)) != 1) { printf("Error reading bpp from %s. \n", filename); return 0; } if (bpp != 24) { printf("Bpp from %s is not 24: %u\n", filename, bpp); return 0; } fseek(fp, 24, SEEK_CUR); // 跳过余下的头文件数据 image->data = (char*) malloc (size); // 分配大小 if (image->data == NULL) { printf("Error allocating memory for color-corrected image data"); return 0; } if ((i = fread(image->data, size, 1, fp)) != 1) //读取数据 { printf("Error reading image data from %s. \n", filename); return 0; } for (i = 0; i < size; i += 3) // 交换颜色 bgr -> rgb { temp = image->data[i]; image->data[i] = image->data[i+2]; image->data[i+2] = temp; } return 1; } // 读取 bitmaps 并转化成纹理 void LoadGLTextures() { for(int i = 0; i < 6; i++) { image[i] = (struct Image*)malloc(sizeof(Image)); if (image[i] == NULL) { printf("Error allocating space for image"); exit(0); } if (!ImageLoad(pictures[i], image[i])) //读取图片到Image中 { exit(1); } glGenTextures(i+1, &texture[i]); // 创建纹理 glBindTexture(GL_TEXTURE_2D, texture[i]); // 绑定2D纹理 // 当图片大于当前纹理时线性缩放 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); // 当图片小于当前纹理时线性缩放 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, 3, image[i]->width, image[i]->length, 0, GL_RGB, GL_UNSIGNED_BYTE, image[i]->data); } } void drawcube()//画立方体 { //左面 glBindTexture(GL_TEXTURE_2D, texture[0]); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f);glVertex3f(-LENGTH,-LENGTH,LENGTH); glTexCoord2f(1.0f, 0.0f);glVertex3f(-LENGTH,LENGTH,LENGTH); glTexCoord2f(1.0f, 1.0f);glVertex3f(-LENGTH,LENGTH,-LENGTH); glTexCoord2f(0.0f, 1.0f);glVertex3f(-LENGTH,-LENGTH,-LENGTH); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[1]); //右面 glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f);glVertex3f(LENGTH,-LENGTH,-LENGTH); glTexCoord2f(1.0f, 0.0f);glVertex3f(LENGTH,LENGTH,-LENGTH); glTexCoord2f(1.0f, 1.0f);glVertex3f(LENGTH,LENGTH,LENGTH); glTexCoord2f(0.0f, 1.0f);glVertex3f(LENGTH,-LENGTH,LENGTH); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[2]); //前面 glBegin(GL_QUADS); glTexCoord2f(1.0f, 1.0f);glVertex3f(LENGTH,-LENGTH,LENGTH); glTexCoord2f(0.0f, 1.0f);glVertex3f(LENGTH,LENGTH,LENGTH); glTexCoord2f(0.0f, 0.0f);glVertex3f(-LENGTH,LENGTH,LENGTH); glTexCoord2f(1.0f, 0.0f);glVertex3f(-LENGTH,-LENGTH,LENGTH); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[3]); //后面 glBegin(GL_QUADS); glTexCoord2f(0.0f, 1.0f);glVertex3f(-LENGTH,-LENGTH,-LENGTH); glTexCoord2f(0.0f, 0.0f);glVertex3f(-LENGTH,LENGTH,-LENGTH); glTexCoord2f(1.0f, 0.0f);glVertex3f(LENGTH,LENGTH,-LENGTH); glTexCoord2f(1.0f, 1.0f);glVertex3f(LENGTH,-LENGTH,-LENGTH); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[4]); //上面 glBegin(GL_QUADS); glTexCoord2f(1.0f, 1.0f);glVertex3f(LENGTH,LENGTH,LENGTH); glTexCoord2f(0.0f, 1.0f);glVertex3f(LENGTH,LENGTH,-LENGTH); glTexCoord2f(0.0f, 0.0f);glVertex3f(-LENGTH,LENGTH,-LENGTH); glTexCoord2f(1.0f, 0.0f);glVertex3f(-LENGTH,LENGTH,LENGTH); glEnd(); glBindTexture(GL_TEXTURE_2D, texture[5]); //下面 glBegin(GL_QUADS); glTexCoord2f(1.0f, 0.0f);glVertex3f(LENGTH,-LENGTH,-LENGTH); glTexCoord2f(1.0f, 1.0f);glVertex3f(LENGTH,-LENGTH,LENGTH); glTexCoord2f(0.0f, 1.0f);glVertex3f(-LENGTH,-LENGTH,LENGTH); glTexCoord2f(0.0f, 0.0f);glVertex3f(-LENGTH,-LENGTH,-LENGTH); glEnd(); glFlush(); } void initPoint() //初始化点数组 { //先读取前面的四个点，按逆时针方向，正对着这个面 pointCurrentState[0].x = LENGTH; pointCurrentState[0].y = -LENGTH; pointCurrentState[0].z = LENGTH; pointCurrentState[1].x = LENGTH; pointCurrentState[1].y = LENGTH; pointCurrentState[1].z = LENGTH; pointCurrentState[2].x = -LENGTH; pointCurrentState[2].y = LENGTH; pointCurrentState[2].z = LENGTH; pointCurrentState[3].x = -LENGTH; pointCurrentState[3].y = -LENGTH; pointCurrentState[3].z = LENGTH; //再读取后面的四个点，正对着这个面，按逆时针 pointCurrentState[4].x = -LENGTH; pointCurrentState[4].y = -LENGTH; pointCurrentState[4].z = -LENGTH; pointCurrentState[5].x = -LENGTH; pointCurrentState[5].y = LENGTH; pointCurrentState[5].z = -LENGTH; pointCurrentState[6].x = LENGTH; pointCurrentState[6].y = LENGTH; pointCurrentState[6].z = -LENGTH; pointCurrentState[7].x = LENGTH; pointCurrentState[7].y = -LENGTH; pointCurrentState[7].z = -LENGTH; } void initPlane() //初始化每个面 { //初始化顺序为左、右、前、后、上、下 planeAll[0].mask = 0; //左边的那个面初始化 planeAll[0].p[0] = 3; planeAll[0].p[1] = 2; planeAll[0].p[2] = 5; planeAll[0].p[3] = 4; planeAll[1].mask = 1; //右边的那个面初始化 planeAll[1].p[0] = 7; planeAll[1].p[1] = 6; planeAll[1].p[2] = 1; planeAll[1].p[3] = 0; planeAll[2].mask = 2; //前边的那个面初始化 planeAll[2].p[0] = 0; planeAll[2].p[1] = 1; planeAll[2].p[2] = 2; planeAll[2].p[3] = 3; planeAll[3].mask = 3; //后边的那个面初始化 planeAll[3].p[0] = 4; planeAll[3].p[1] = 5; planeAll[3].p[2] = 6; planeAll[3].p[3] = 7; planeAll[4].mask = 4;//上边的那个面初始化 planeAll[4].p[0] = 1; planeAll[4].p[1] = 6; planeAll[4].p[2] = 5; planeAll[4].p[3] = 2; planeAll[5].mask = 5;//下边的那个面初始化 planeAll[5].p[0] = 7; planeAll[5].p[1] = 0; planeAll[5].p[2] = 3; planeAll[5].p[3] = 4; } void clearCubev() //清空cubev中的内容 { cubev.x = 0.0f; //初始化立方体中心点位置 cubev.y = 0.0f; cubev.z = 0.0f; cubev.xrot = 0.0f; //初始化立方体旋转角度 cubev.yrot = 0.0f; cubev.zrot = 0.0f; } void init(void) //初始化