程式語言 - The OpenGL Utility Toolkit (GLUT) - Hello, world!

參考資訊：
https://www.khronos.org/opengl/wiki/Code_Resources
https://cs.lmu.edu/~ray/notes/openglexamples/
https://www.opengl.org/resources/libraries/glut/glut_downloads.php

main.c

#include <stdio.h>
#include <GL/glut.h>

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();
}

int main(int argc, char * argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(300, 300);
    glutCreateWindow("Hello, world!");
    glutDisplayFunc(display);
    glClearColor(1.0, 0, 0, 1.0);
    glutMainLoop();

    return 0;
}

編譯、執行

$ gcc main.c -o main -lglut -lGL
$ ./main