week10電腦圖學

 week10

背景圖

1.輸入程式碼(earth.jpg)還不能用

#include <opencv/highgui.h>

#include <opencv/cv.h>

#include <GL/glut.h>

int myTexture(char * filename)

{

    IplImage * img = cvLoadImage(filename);

    cvCvtColor(img,img, CV_BGR2RGB);

    glEnable(GL_TEXTURE_2D);

    GLuint id;

    glGenTextures(1, &id);

    glBindTexture(GL_TEXTURE_2D, id);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);

    return id;

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_POLYGON);

        glTexCoord2f(0,1);  glVertex2f(-1,-1);///左下

        glTexCoord2f(1,1);  glVertex2f(1,-1);///右下

        glTexCoord2f(1,0);  glVertex2f(1,1);///右上

        glTexCoord2f(0,0);  glVertex2f(-1,1);///左上

    glEnd();///圖片左上角是(0,0)，視窗左下角是(-1,-1)

    glutSwapBuffers();

}

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week10 texture background");

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    glutMainLoop();

}

2.將你準備的earth.jpg匯入freeglut->lib的資料夾內

3.新增一個flaot angle=0;在display() 加入Rotatef(angle,0,0,1)函數(讓地球旋轉)

鋼彈貼圖的程式碼

#include <opencv/highgui.h> #include <opencv/cv.h> #include <GL/glut.h> GLUquadric * sphere=NULL; int myTexture(char * filename) { IplImage * img = cvLoadImage(filename); cvCvtColor(img,img, CV_BGR2RGB); glEnable(GL_TEXTURE_2D); GLuint id; glGenTextures(1, &id); glBindTexture(GL_TEXTURE_2D, id); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData); return id; } float angle=0; void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(90,1,0,0);///轉正地球 glRotatef(angle,0,0,1); gluQuadricTexture(sphere,1); gluSphere(sphere,1,30,30); glPopMatrix(); glutSwapBuffers(); angle+=1;///每次執行都轉1度 } int main(int argc,char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH); glutCreateWindow("week10 texture earth"); glEnable(GL_DEPTH_TEST);///3D深度測試，開了才有3D效果 glutIdleFunc(display);///有空就執行display glutDisplayFunc(display); myTexture("earth.jpg"); sphere=gluNewQuadric(); glutMainLoop(); }