http://www.opengl.org/resources/libraries/glut/
or
http://user.xmission.com/~nate/glut.html
(for windows)
I used Cygwin to compile my code.
#include <stdio.h>
#include <GL/gl.h>
#include <GL/glut.h>
#define KEY_ESCAPE 27 // definition for exiting program with key
#define RAFAEL 127 // definition added to exit program with the key delete as well.
void display();
void ThisInit();
void keyboardesc(unsigned char, int, int);
/* argc is the number of arguments passed to the executable, argv contains the actual arguments
argv is a pointer to an array of null terminated strings, and argv is how large the array is
like such:
c:\test.exe hello world
Then argc=3
argv[0]="c:\test.exe"
argv[1]="hello"
argv[2]="world"
*/
/* GLUT set up and initialization */
int main(int argc, char **argv)
{
glutInit(&argc, argv); // GLUT initialization
glutInitWindowSize(500, 500); // set window size
glutInitWindowPosition(100, 100); // set window position
glutCreateWindow("OpenGL Window"); // create window with specific title
glutDisplayFunc(display); // register display function
glutKeyboardFunc(keyboardesc); // register Keyboard Handler
ThisInit();
glutMainLoop(); // run GLUT mainloop
return 0;
}
/* Initialization function for the window with OpenGl settings*/
void ThisInit() {
glClearColor(1.0, 1.0, 1.0, 0.0); /* red,gree,blue,alpha */
glShadeModel(GL_SMOOTH);
glEnable(GL_BLEND);
glEnable(GL_TEXTURE_2D);
}
/* display function draws what the window contains
This functions gets called repeatedly by GLUT's
main loop
*/
void display() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); //display mode
glLoadIdentity();// load identity matrix
glColor3f(0.0f, 1.0f, 0.0f); //green color
glBegin(GL_TRIANGLES);//start drawing triangles
glColor3f(0.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, -0.25f, 0.0f);//triangle one first vertex
glColor3f(0.0f, 1.0f, 1.0f);
glVertex3f(-0.5f, -0.25f, 0.0f);//triangle one second vertex
glColor3f(1.0f, 0.0f, 1.0f);
glVertex3f(-0.75f, 0.25f, 0.0f);//triangle one third vertex
//drawing second triangle
glVertex3f(-0.5f, -0.25f, 0.0f);//triangle two first vertex
glColor3f(1.0f, 1.0f, 0.0f);
glVertex3f(0.5f, -0.25f, 0.0f);//triangle two second vertex
glVertex3f(0.0f, 0.25f, 0.0f);//triangle two third vertex
//drawing third triangle
glVertex3f(0.5f, -0.25f, 0.0f);//triangle three first vertex
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(1.0f, -0.25f, 0.0f);//triangle three second vertex
glVertex3f(0.75f, 0.25f, 0.0f);//triangle three third vertex
glEnd();//end drawing of triangles
glFlush();
}
/* key board exit program*/
void keyboardesc(unsigned char key, int x, int y)
{
switch (key)
{
case KEY_ESCAPE:
exit(0);
break;
case RAFAEL:
exit(0);
break;
default:
break;
}
}
When compiling your code you need to link the proper library by doing this:
gcc 1.c -o nameoffile.c -o nameofouput -lglut
the output should look like this:
