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What Is OpenGL? | |
OpenGL is a Graphics rendering API which is operating system independent, window system independent and has high-quality color images composed of geometric and image primitives. | |
OpenGL APIs can use following … | |
Gl | |
OpenGL API implementation (http://www.opengl.org) | |
Glu | |
OpenGL Utility | |
Glut – GLUT (OpenGL Utility Toolkit) – Glut is portable windowing API and it is not officially part of OpenGL. | |
OpenGL Utility Toolkit (http://www.opengl.org/resources/libraries/glut/) | |
FLTK | |
FlashLight ToolKit (http://www.fltk.org/) | |
GLEW… | |
Now lets see How to install OpenGL on out Ubuntu OS. | |
Now because GLUT (OpenGL Utility Toolkit) depends upon OpenGL and a number of other related libraries, if we install GLUT then OpenGL will be automatically be installed. | |
Run the following commands to install OpenGL. | |
$ sudo apt-get update | |
$ sudo apt-get install libglu1-mesa-dev freeglut3-dev mesa-common-dev | |
Now to test if OpenGl libraries are working fine on our Linux, we will create a C++ program and test it. | |
So create a following C++ Program. | |
#include <GL/glut.h> | |
void displayMe(void) | |
{ | |
glClear(GL_COLOR_BUFFER_BIT); | |
glBegin(GL_POLYGON); | |
glVertex3f(0.5, 0.0, 0.5); | |
glVertex3f(0.5, 0.0, 0.0); | |
glVertex3f(0.0, 0.5, 0.0); | |
glVertex3f(0.0, 0.0, 0.5); | |
glEnd(); | |
glFlush(); | |
} | |
int main(int argc, char** argv) | |
{ | |
glutInit(&argc, argv); | |
glutInitDisplayMode(GLUT_SINGLE); | |
glutInitWindowSize(400, 300); | |
glutInitWindowPosition(100, 100); | |
glutCreateWindow("Hello world!"); | |
glutDisplayFunc(displayMe); | |
glutMainLoop(); | |
return 0; | |
} | |
Now give the command below to compile your code. | |
$ g++ main.cpp -o firstOpenGlApp -lglut -lGLU -lGL | |
Now run your OpenGl program with following command | |
$ ./firstOpenGlApp |
I seem to be having the issue:
In file included from /usr/include/GL/glut.h:17:0,
from test.cpp:1:
/usr/include/GL/freeglut_std.h:128:13: fatal error: GL/gl.h: No such file or directory
# include <GL/gl.h>
^~~~~~~~~
compilation terminated.
I called the file test.cpp
instead of main.cpp
#include <GL/glut.h>
is the correct header to include @ominusliticus
Installed everything following this tutorial, when I compile a glew/GLFW project it works but upon running it gives Assertion `tls->posix.allocated == GLFW_TRUE' failed
and aborts. Is this a quirk of my operating system (Kubuntu 20.04), or do I need to install compatibility libraries?
Thanks a lot this was very much helpful I was able to create my first window and draw a Polygon. I am running Ubuntu 20.04
I have a hello world windows and that is black and a white triangle .... is this normal ?
Dude, you are a lifesaver, this is the first time I have ever made C++ code create a pop-up graphical item!
thx bro. so clean and impressive!
Easier than the other articles and videos I walked through and it works. Thank you
The instruction was very easy to understand for a newbie like me. Thank you.
I didn't have to modify any command. I just use Makefile to automate the building task. So that linkers are linked properly. Thank you so much!