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Introduction to GL

Introduction to GL. Geb Thomas. Example Code. int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode ( GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowPosition(100,100); glutInitWindowSize(300,300); glutCreateWindow ("square");

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Introduction to GL

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  1. Introduction to GL Geb Thomas

  2. Example Code int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode ( GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowPosition(100,100); glutInitWindowSize(300,300); glutCreateWindow ("square"); glClearColor(0.0, 0.0, 0.0, 0.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0.0, 10.0, 0.0, 10.0, -1.0, 1.0); glutDisplayFunc(display); glutMainLoop(); return 0; void display(void) { glClear( GL_COLOR_BUFFER_BIT); glColor3f(0.0, 1.0, 0.0); glBegin(GL_POLYGON); glVertex3f(2.0, 4.0, 0.0); glVertex3f(8.0, 4.0, 0.0); glVertex3f(8.0, 6.0, 0.0); glVertex3f(2.0, 6.0, 0.0); glEnd(); glFlush(); }

  3. What’s Going On? • OpenGL – The graphics calls • GLUT – Utility for opening windows • Both have header files and libraries • Opengl32.dll, glut32.dll • opengl.h, glut32.h

  4. Using GLUT To Initialize the Display glutInit(&argc, argv); glutInitDisplayMode ( GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);

  5. Setting Up and Opening the Window glutInitWindowPosition(100,100); glutInitWindowSize(300,300); glutCreateWindow ("square");

  6. Setting Up the Matrices glClearColor(0.0, 0.0, 0.0, 0.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0.0, 10.0, 0.0, 10.0, -1.0, 1.0);

  7. Defining the Drawing Routine glutDisplayFunc(display);

  8. Drawing Some Stuff void display(void) { glClear( GL_COLOR_BUFFER_BIT); glColor3f(0.0, 1.0, 0.0); glBegin(GL_POLYGON); glVertex3f(2.0, 4.0, 0.0); glVertex3f(8.0, 4.0, 0.0); glVertex3f(8.0, 6.0, 0.0); glVertex3f(2.0, 6.0, 0.0); glEnd(); glFlush(); }

  9. Repeating the Loop glutMainLoop();

  10. Details are Here www.opengl.org Good book: Open GL Programmer’s Guide

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