欸幹你看，是圖學欸Week13

安裝OpenCV，把設定調整好

上去hackmd.io/@jsyeh/opengl複製程式碼貼到main.cpp

去teams下載圖片檔放進專案 (把 puipui.jpg 改成 Diffuse.jpg)，把圖檔放好 桌面/freeglut/bin

把source.zip裡面的三個檔案拉進week13_robot裡

#include <opencv/highgui.h> ///使用 OpenCV 2.1 比較簡單, 只要用 High GUI 即可#include <opencv/cv.h>#include <GL/glut.h>#include "glm.h"GLMmodel * pmodel = NULL;voiddrawmodel(void){    if (!pmodel)    { pmodel = glmReadOBJ("Gundam.obj"); if (!pmodel) exit(0); glmUnitize(pmodel); glmFacetNormals(pmodel); glmVertexNormals(pmodel, 90.0);    }
    glmDraw(pmodel, GLM_SMOOTH | GLM_TEXTURE);}GLuint id1, id2; ///TODO:增加2個 貼圖IDint myTexture(char * filename){    IplImage * img = cvLoadImage(filename); ///OpenCV讀圖    cvCvtColor(img,img, CV_BGR2RGB); ///OpenCV轉色彩 (需要cv.h)    glEnable(GL_TEXTURE_2D); ///1. 開啟貼圖功能    GLuint id; ///準備一個 unsigned int 整數, 叫 貼圖ID    glGenTextures(1, &id); /// 產生Generate 貼圖ID    glBindTexture(GL_TEXTURE_2D, id); ///綁定bind 貼圖ID    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖T, 就重覆貼圖    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /// 貼圖參數, 超過包裝的範圖S, 就重覆貼圖    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); /// 貼圖參數, 放大時的內插, 用最近點    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /// 貼圖參數, 縮小時的內插, 用最近點    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->imageData);    return id;}float angle=180;void display(){    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glBindTexture(GL_TEXTURE_2D, id1);    glPushMatrix();        glRotated(angle,0,1,0);
    glBindTexture(GL_TEXTURE_2D, id2);    drawmodel();    glBegin(GL_POLYGON);        glTexCoord2f( 0, 0 ); glVertex2f( -1, -1 );        glTexCoord2f( 0, 1 ); glVertex2f( -1, +1 );        glTexCoord2f( 1, 1 ); glVertex2f( +1, +1 );        glTexCoord2f( 1, 0 ); glVertex2f( +1, -1 );    glEnd();    glutSwapBuffers();}int main(int argc, char** argv){    glutInit( &argc, argv );    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH );    glutCreateWindow(" Week13 ");    glutDisplayFunc(display);
    id1 = myTexture("Diffuse.jpg");    id2 = myTexture("bg.jpg");    glEnable(GL_DEPTH_TEST);    glutMainLoop();}