Week16-馬丁

（１）作業：Q&A
（２）複習：貼圖
（３）複習：打光
（４）複習：模型

＜１＞到 https://www.transmissionzero.co.uk/software/freeglut-devel/ 下載檔案，解壓縮到桌面， freeglut 裡的 lib，裡面的 libfreeglut.a 複製一個並改名為 libglut32.a

＜２＞更改ＧＬＵＴ的設定，將圖檔放在freeglut資料夾bin資料夾裡面，放三張，程式碼如下

#include <GL/glut.h>

#include <opencv/highgui.h> ///OpenCV High GUI讀圖

#include <opencv/cv.h> ///OpenCV cvCvtColor() to convert color

///程式碼是對的, 但是沒有設定好include, lib, bin

GLuint id1, id2, id3;///NOW2

float a=0;

void display()

{

    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, id3);///id3 for rotating square

    glPushMatrix();

        glTranslatef(0.5, 0.5, 0);

        glRotatef(a++, 0, 0, 1);

        glScalef(0.3, 0.3, 0.3);

        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();

    glPopMatrix();

    glBindTexture(GL_TEXTURE_2D, id2);///id2 for teapot

    glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

///void myInit()

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;

}

int main(int argc, char **argv)

{

    ///IplImage * img = cvLoadImage("marvel.jpg");

    ///cvShowImage("opencv", img);

    ///cvWaitKey(0);///等你按按鍵

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE |GLUT_DEPTH);

    glutCreateWindow("GLUT");///之後

    ///建好GLUT視窗,可以開始準備 3D 貼圖 (要在create...MainLoop才能建貼圖)

    id1 = myTexture("marvel.jpg"); ///myInit();///我們的貼圖在這裡

    id2 = myTexture("teapot.jpg");

    id3 = myTexture("square.jpg");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();///之前

}