你的筆記 week11

 

做模型(2D)

#include <opencv/highgui.h>

#include <opencv/cv.h>

#include <GL/glut.h>

#include "glm.h"

GLMmodel * pmodel=NULL;

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);

    if( pmodel == NULL){

        pmodel = glmReadOBJ("data/gundam.obj");

        glmUnitize( pmodel );

        glmFacetNormals( pmodel );

        glmVertexNormals( pmodel , 90);

    }

    glmDraw(pmodel,GLM_TEXTURE);

    glutSwapBuffers();///2被交換的buffer

}

int main(int argc, char**argv)

{///進階的main函式

    glutInit( &argc, argv);///初始化

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH);///兩倍交換避免畫面閃爍+3D深度

    glutCreateWindow("week10_texture_background");///建視窗

    glutIdleFunc(display);

    glutDisplayFunc( display );///畫圖函式

    myTexture("data/Diffuse.jpg");///原為earth.jpg

    glEnable(GL_DEPTH_TEST);///開啟3D，將圖片邊界

    glutMainLoop();///主要迴圈

}