Kuo's Graphic_Note_Week09

Step 1 : Using Example (Texture.exe) to know What We Want to Make.

1-1.Download Example (URL: https://jsyeh.org/3dcg10/)

 1-2. Put file "data" to file "windows"

     1-3. Open example (Path:windows/Texture.exe)

 

    1-4. Open Texture.exe

    1-5. Change data

Step 2 : Install OpenCV

    2-1. Download "OpenCV-2.1.0-win32-vs2008.exe" on "Teams"

    2-2. Click "OpenCV-2.1.0-win32-vs2008.exe" to download OpenCV

    2-3. Choose "Add OpenCV to the system PATH for all users"

    2-4. Using default path (C:\OpenCV2.1)

Step 3 :Setting CodeBlocks and OpenCV 

     *Using default path (C:\OpenCV2.1)

    3-1. Open a new empty file

    3-2. Choose: "Setting" -> "Compiler..." 

    3-3. Choose: "Search directories" -> "Linker" & Click: "Add"

    3-4. Choose the path (C:\OpenCV2.1\include) 

    3-5. Choose: "Linker settings" & Click: "Add"

    3-6.   Choose "cv210.lib", "cxcore210.lib", and "highgui210.lib"

Step 4 :Using CodeBlocks and OpenCV to Coding

Final Code:

#include <opencv/highgui.h>

int main(){

    IpImage *img=cvLoadImage("鯊魚.png");

    cvShowImage("week09",img);

    cvWaitKey(0);

}

Step 5 :Using CodeBlocks to set Texture 

    5-1. Download a world map on Google

    5-2. Save the JPG in work file (.\freeglut-MinGW-3.0.0-1.mp\freeglut\bin)

    5-3. Check the path of the file (In work file)

    5-4. Make a white teapot

Code:

#include <GL/glut.h>

void display(){

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int ac, chat**av){

    glutInit(&ac,av);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week09 texture");

    glutDisplayFunc(display);

    glutMainLoop();

}

    5-5. Coding

    5-6. Build & Run

    5-7. Texture on the teapot

Final Code:

#include <GL/glut.h>

#include <opencv/highgui.h>

#include <opencv/cv.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 ac,char**av){

    glutInit(&ac,av);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week09 texture");

    glutDisplayFunc(display);

    myTexture("earth.jpg");

    glutMainLoop();

}