OpenGL이 cmd 프롬프트에서 실행되지 않을 때 올바른 출력을 표시하지 않습니다.

Question

1 학년 학생을위한 수학 교육 시스템을 작성하려고합니다. 내 목표는 모든 상호 작용을 창 내에서 실행하는 것입니다. 첫 번째 창 (+ 창)을 클릭하면 출력이없는 검은 색 창이 나타나지만 명령 프롬프트에서 제대로 실행됩니다.

#include "stdafx.h" 
#include <stdlib.h> 
#include <iostream> 
#include <glut.h> 
#include <time.h> 

using namespace std; 
GLfloat xrot; 
GLfloat yrot; 
bool mouseDown = false; 
bool createWindow = false; 

int m=0; 
int n=0; 
int num1=0; 
int num2=0; 
int counter=0; 

//------------------------------------------------------------------- 


void handleKeypress(unsigned char key,int x,int y) 
{ 
    switch(key) 
    { 
     case 27: 
     exit(0); 
    } 
} 

void handleResize(int w,int h) 

{ 

    glViewport(0,0,w,h); 

    glMatrixMode(GL_PROJECTION); 

    gluPerspective(45.0,(double)w/(double)h,1.0,200); 

} 

void idle() 
{ 
if (!mouseDown) 
{ 
xrot+= 0.3f; 
yrot+= 0.4f; 
} 

glutPostRedisplay(); 
} 

void drawScene1() 

{ 

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 

    glMatrixMode(GL_MODELVIEW); 

    glLoadIdentity(); 

    glBegin(GL_QUADS); 
    glColor3f(1.0,0.0,0.0); 
    glVertex3f(-1.0f,5.0f,-20.0f); 
    glVertex3f(-1.0f,-5.0f,-20.0f); 
    glVertex3f(1.0f,-5.0f,-20.0f); 
    glVertex3f(1.0f,5.0f,-20.0f); 
    glEnd(); 

    glRotatef(90.0,0.0f,0.0f,1.0f); 

    glBegin(GL_QUADS); 
    glColor3f(1.0,0.0,0.0); 
    glVertex3f(-1.0f,5.0f,-20.0f); 
    glVertex3f(-1.0f,-5.0f,-20.0f); 
    glVertex3f(1.0f,-5.0f,-20.0f); 
    glVertex3f(1.0f,5.0f,-20.0f); 
    glutSwapBuffers(); 


} 

void drawScene2() 

{ 

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 

    glMatrixMode(GL_MODELVIEW); 

    glLoadIdentity(); 

    glRotatef(90.0,0.0f,0.0f,1.0f); 

    glBegin(GL_QUADS); 
    glColor3f(0.0,0.0,1.0); 
    glVertex3f(-1.0f,5.0f,-20.0f); 
    glVertex3f(-1.0f,-5.0f,-20.0f); 
    glVertex3f(1.0f,-5.0f,-20.0f); 
    glVertex3f(1.0f,5.0f,-20.0f); 
    glEnd(); 

    glutSwapBuffers(); 
} 

void myInit(void) 
{ 
glEnable(GL_DEPTH_TEST); 
glClearColor(1.0, 1.0, 1.0, 0.0); // set the background to white 
glColor3f(0.0, 0.0, 0.0); 
// set the drawing color to black 

glMatrixMode(GL_PROJECTION); 
glLoadIdentity(); 
glOrtho(-1000.0,1000.0,-1000.0,1000.0,-100.0,100.0); 
glMatrixMode(GL_MODELVIEW); 
glLoadIdentity(); 

} 
//------------------------------------------------------ 

void triangle() 
{ 
    glBegin(GL_TRIANGLES); 
    glColor3f(1.0f,0.0f,0.0f); 
    glVertex3f(0.0f,100.0f,0.0f); 
    glVertex3f(100.0f,-100.0f,0.0f); 
    glVertex3f(-100.0f,-100.0f,0.0f); 
    glEnd(); 
} 

void minus() 
{ 
    glPushMatrix(); 
    glBegin(GL_QUADS); 
    glColor3f(0.0f,1.0f,0.0f); 
    glVertex3f(-200.0f,50.0f,0.0f); 
    glVertex3f(-200.0f,-50.0f,0.0f); 
    glVertex3f(200.0f,-50.0f,0.0f); 
    glVertex3f(200.0f,50.0f,0.0f); 
    glEnd(); 
    glPopMatrix(); 
} 

void myDisplay(void) 
{ 

// Clear Color and Depth Buffers 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

    // Reset transformations 
    glLoadIdentity(); 

    // Set the camera 
    gluLookAt(0, 0, 3, 0 , 0 , 0 , 0.0f,1.0f,0.0f); 

    //Generate random number 
    srand (time(NULL)); 
    num1 = rand() % 10 +1; 
    num2 = rand() % 10 +1; 
    if(num1 < num2){ 
    int temp = num1; 
    num1 = num2; 
    num2 = temp; 
    } 

    //rows and column 
    m = 2; //row 
    n = 5; //column 

    counter=0; //make sure it zero 

    //First Number to be draw 
    glPushMatrix(); //set as origin 
    glTranslatef(-700.0,700, 0); //translate 
    //draw 
    for(int i = 0; i < m; i++){ //row 
     for(int j=0; j < n; j++) { //column 
      if(counter>=num1) break; //a=how many triangle need to draw; s=already draw how many triangle; 
      glPushMatrix(); //set transformation 
      glTranslatef(i*200.0 ,j*-200.0, 0); //translate 
      triangle(); //draw triangle 
      glPopMatrix(); //reset transformation 
      counter++; //counter s 
     } 
    } 
    glPopMatrix(); //reset transformation 

    //create plus sign 
    glPushMatrix(); //set transformation or object position/orientation/scale for reset 
    glTranslatef(0.0,400, 0); 
    minus(); 
    glPopMatrix(); //reset transformation to origin 

    counter=0; //reset counter 
    //Second number to be draw 
    glPushMatrix(); 
    glTranslatef(500.0,700, 0); 
    for(int i = 0; i < m; i++){ 
     for(int j=0; j < n; j++) { 
      if(counter>=num2) break; 
      glPushMatrix(); 
      glTranslatef(i*200.0 ,j*-200.0, 0); 
      triangle(); 
      glPopMatrix(); 
      counter++; 
     } 
    } 
    glPopMatrix(); 

    //Control 
    glutSwapBuffers();//take the drawing to the screen 

    //check answer 
    /*cout<<num1<<endl; //debug 
    cout<<num2<<endl;*/ 

    int check=0; 
    int answer=0; 
    cout << "Answer ???"<<endl; 
    cin >> answer; 
    while(true){ 
     check=num1-num2; 
     if(answer==check){ 
      cout << "CORRECT!!!"<<endl; 
      break; 
     } else{ 
      cout << "TRY AGAIN!!!"; 
      cout << "Answer ???"<<endl; 
      cin >> answer; 
     } 
    } 
} 



void mouse (int button, int state, int x, int y){ 
    if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN){ 
    myInit(); 
    triangle(); 
    minus(); 
    myDisplay(); 
    } 
} 


int main(int argc,char** argv) 

{ 

    glutInit(&argc,argv); 

    myInit(); 

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH); 

    glutInitWindowSize(500,500); 


    //window1= 

    glutCreateWindow("First window"); 

    glutDisplayFunc(drawScene1); 

    glutKeyboardFunc(handleKeypress); 

    glutReshapeFunc(handleResize); 
    glutMouseFunc(mouse); 

    //create the second window 

    //window2 = 

    glutCreateWindow("Second Window"); 

    //define a window position for second window 

    glutPositionWindow(540,40); 

    // register callbacks for second window, which is now current 

    glutReshapeFunc(handleResize); 

    glutDisplayFunc(drawScene2); 

    glutKeyboardFunc(handleKeypress); 
    glutMouseFunc(mouse); 

    glutMainLoop(); 





    return 0; 


} 

Answer 1

사용자는 윈도우 시스템 이벤트 프로세싱 STDIO (즉 콘솔 입력/출력)를 혼합하고있다. 이것은 문제의 처방입니다. stdio 작업은 완료 될 때까지 차단됩니다. cin에서 읽는 경우, 라인 피드가 입력 될 때까지 콘솔에서 입력을 기다리는 프로세스가 차단됩니다. 이 시간 동안 창 작업이 처리되지 않고 OpenGL 창으로 그려지지 않습니다.

요약하면 간단하게 두 가지를 혼합 할 수 없습니다. 출력 (cout 및 cerr)을 사용할 수 있습니다. 콘솔이 연결되어 있지 않으면 NIL에 쓸 것이지만, 무언가를 읽으려는 시도는 무기한 차단됩니다. 이벤트 대화식 프로그램에서 사용자와 상호 작용하려면 stdio 이상의 다른 방법을 고려해야합니다. 나는. 키보드 콜백에서 키 이벤트를 처리해야합니다.