瞎78打-12

( 1 ) 作業 Q & A
( 2 ) 複習 : 貼圖
( 3 ) 複習 : 打光
( 4 ) 複習 : 模型
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貼圖基礎設定:
 



include 2個
   #include <opencv/highgui.h> ///OpenCV High GUI讀圖
   #include <opencv/cv.h> ///OpenCV cvCvtColor() to convert color

GLuint id1, id2;///NOW2 幾個圖檔就幾個變數

在模型上面加貼圖
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glBindTexture(GL_TEXTURE_2D, id1);///id1 for background
    glBegin(GL_POLYGON);
        glTexCoord2f(0, 0); glVertex3f(-1, +1, 0);
        glTexCoord2f(0, 1); glVertex3f(-1, -1, 0);
        glTexCoord2f(1, 1); glVertex3f(+1, -1, 0);
        glTexCoord2f(1, 0); glVertex3f(+1, +1, 0);
    glEnd();
    glBindTexture(GL_TEXTURE_2D, id2);///id2 for teapot
    glutSolidTeapot( 0.3 );
    glutSwapBuffers();
}
加背景
GLuint myTexture(char * filename)
{
    IplImage * img = cvLoadImage(filename); ///NOW OpenCV
    cvCvtColor(img, img, CV_BGR2RGB);///convert color ///NOW OpenCV

    GLuint id;
    glEnable(GL_TEXTURE_2D);
    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;
}