Program 1: Output primitive function

Main Thing Required:

1. Header file

2. Display Function

3. Main Function

HEADER FILE :

Header file contains:

#include<GL/glut.h>

#include<windows.h>

DISPLAY FUNCTION:

Your Object Creation is done here, where you have to:

Create a display function. //eg: void display()

Declare the window color

#include<GL/glut.h>

#include<windows.h>

void display()

{

    glClearColor(0.0,0.0,0.0,0.0); //window color

    glClear(GL_COLOR_BUFFER_BIT);

}

Create your object using the output primitives i.e triangle,line,points,quads,polygon

#include<GL/glut.h>

#include<windows.h>

void display()

{

    glClearColor(0.0,0.0,0.0,0.0);

    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0,1.0,1.0);//object color

    glBegin(GL_QUADS);//drawing a quad 

    glVertex2f(0.0,0.0);

    glVertex2f(0.10,0.0);

    glVertex2f(0.10,0.5);

    glVertex2f(0.0,0.5);

    glEnd();

    glFlush(); //to render

}

MAIN:

In the main function declare your glut function.

create a main function:

#include<GL/glut.h>

#include<windows.h>

void display()

{

    glClearColor(0.0,0.0,0.0,0.0);

    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0,1.0,1.0);

    glBegin(GL_QUADS);

    glVertex2f(0.0,0.0);

    glVertex2f(0.10,0.0);

    glVertex2f(0.10,0.5);

    glVertex2f(0.0,0.5);

    glEnd();

    glFlush();

}

int main(int argc,char** argv)

{

}

in the main function, initialize the arguments 

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

}

then, create a window and specify its size.

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutCreateWindow("Prog");

    glutInitWindowSize(320,320);

}

 Now, call your display function in the main and loop it

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutCreateWindow("Prog");

    glutInitWindowSize(320,320);

    glutDisplayFunc(display);

    glutMainLoop();

    return 0;

}

  

SAMPLE: PROGRAM 1 (Objects using output primitive)

#include<GL/glut.h>

#include<windows.h>

void display()

{

    glClearColor(0.0,0.0,0.0,0.0);

    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0,1.0,1.0);

    glBegin(GL_QUADS);

    glVertex2f(0.0,0.0);

    glVertex2f(0.10,0.0);

    glVertex2f(0.10,0.5);

    glVertex2f(0.0,0.5);

    glEnd();

    glFlush();

}

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutCreateWindow("Prog");

    glutInitWindowSize(320,320);

    glutDisplayFunc(display);

    glutMainLoop();

    return 0;

}