咻碰閃week07

 week07

1-1 https://jsyeh.org/3dcg10/  下載data、win32資料夾，解壓縮windows.zip資料夾，將data資料夾拉進windows資料夾，打開Textrue.exe

可以更改顏色、頂點座標

1-2 講解貼圖座標，改貼圖座標時，介於0到1之間。但超過範圍，如果是GL_REOEAT，會切回0到1之間重複。

2-1 期中模擬 https://jsyeh.org/gl/opengl_10_func.html

3-1 上課軟體中下載OpenCV

要勾選下面兩個其中之一

裝好後重開Codeblocks

3-2 設置

settings>Compiler>Serch directories>Compiler>Add>C:\OpenCV2.1\include

settings>Compiler>Serch directories>Linker>Add>C:\OpenCV2.1\lib

settings>Compiler>Serch directories>Linker settings>Add>cv210、cxcore210、highgui210

3-3 新增empty file命名為week07-1_opencv_cvLoadImage_cvShowImage

#include <opencv/highgui.h>

int main()

{

    IplImage * img = cvLoadImage("檔名.png"); ///記得將圖片放在同一個位置

    cvShowImage("week07", img);

    cvWaitKey(0);

}

4-1 開新專案 Week07-2_myTexture

貼上從gist.github.com/jsyeh複製的myTextrue程式

把下載的earth.jpg放在freeglut>bin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>

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;

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week07 texture");

    glutDisplayFunc(display);

    myTexture("earth.jpg");///這個圖檔, 現在不存在

    ///圖檔要放在特別的工作執行目錄

    glutMainLoop();

}

4-2 改void display()程式

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    ///glutSolidTeapot( 0.3 );

    glBegin(GL_POLYGON);

        glTexCoord2f(0, 0); glVertex2f(-1, +1);

        glTexCoord2f(1, 0); glVertex2f(+1, +1);

        glTexCoord2f(1, 1); glVertex2f(+1, -1);

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

    glEnd();

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

4-3 貼上從gist.github.com/jsyeh複製的myEarth程式，畫出會旋轉的地球

#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>

GLUquadric * sphere = NULL;///一個指到二次曲面的指標

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;

}

float angle=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle, 0,-1,0);

        glRotatef(90, 1,0,0);

        gluQuadricTexture(sphere, 1);

        gluSphere(sphere, 1, 30, 30);///glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week10 texture background");

    glutIdleFunc(display);

    glutDisplayFunc(display);

    myTexture("myEarth.jpg");

    sphere = gluNewQuadric();

    glEnable(GL_DEPTH_TEST);

    glutMainLoop();

}