04163022_溫洺漢, week17

1.期末作品示範
2.背景貼圖示範
3.打光,貼圖切換
4.讀檔內插示範
5.學期總複習

必須先下載OpenCV 2.1 並安裝到桌面
還需要cv210 / cxcore210 / highgui210 這三個檔案

void display()
{   
glEnable(GL_DEPTH_TEST); ///要啟動 Detph Test 深度值的測試,3D顯示才正確
    glClear(GL_COLOR_BUFFER_BIT  | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glBegin(GL_POLYGON);
            glTexCoord2f(0,0); glVertex3f(-1,+1,0);///前面是貼圖座標，後面是3D頂點
            glTexCoord2f(1,0); glVertex3f(+1,+1,0);
            glTexCoord2f(1,1); glVertex3f(+1,-1,0);
            glTexCoord2f(0,1); glVertex3f(-1,-1,0);
        glEnd();
    glPopMatrix();
    glFlush();
}

void myInit()
{
    quad = gluNewQuadric();
    id = myTexture("images.jpg");///id為貼圖，這樣就可以讀到貼圖的路徑

}




int 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;

}