Note that attributes, such as current color and matrix, are changed.
/* * Copyright (c) 1993-1997, Silicon Graphics, Inc. * ALL RIGHTS RESERVED * Permission to use, copy, modify, and distribute this software for * any purpose and without fee is hereby granted, provided that the above * copyright notice appear in all copies and that both the copyright notice * and this permission notice appear in supporting documentation, and that * the name of Silicon Graphics, Inc. not be used in advertising * or publicity pertaining to distribution of the software without specific, * written prior permission. * * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. * * US Government Users Restricted Rights * Use, duplication, or disclosure by the Government is subject to * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph * (c)(1)(ii) of the Rights in Technical Data and Computer Software * clause at DFARS 252.227-7013 and/or in similar or successor * clauses in the FAR or the DOD or NASA FAR Supplement. * Unpublished-- rights reserved under the copyright laws of the * United States. Contractor/manufacturer is Silicon Graphics, * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. * * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. */ #include <GL/openglut.h> #include <stdlib.h> GLuint listName; static void init (void) { listName = glGenLists (1); glNewList (listName, GL_COMPILE); glColor3f (1.0, 0.0, 0.0); /* current color red */ glBegin (GL_TRIANGLES); glVertex2f (0.0, 0.0); glVertex2f (1.0, 0.0); glVertex2f (0.0, 1.0); glEnd (); glTranslatef (1.5, 0.0, 0.0); /* move position */ glEndList (); glShadeModel (GL_FLAT); } static void drawLine (void) { glBegin (GL_LINES); glVertex2f (0.0, 0.5); glVertex2f (15.0, 0.5); glEnd (); } void display(void) { GLuint i; glClear (GL_COLOR_BUFFER_BIT); glColor3f (0.0, 1.0, 0.0); /* current color green */ for (i = 0; i < 10; i++) /* draw 10 triangles */ glCallList (listName); drawLine (); /* is this line green? NO! */ /* where is the line drawn? */ glFlush (); } void reshape(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); if (w <= h) gluOrtho2D (0.0, 2.0, -0.5 * (GLfloat) h/(GLfloat) w, 1.5 * (GLfloat) h/(GLfloat) w); else gluOrtho2D (0.0, 2.0 * (GLfloat) w/(GLfloat) h, -0.5, 1.5); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } /* ARGSUSED1 */ void keyboard(unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; } } /* Main Loop * Open window with initial window size, title bar, * RGBA display mode, and handle input events. */ int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowSize(650, 50); glutCreateWindow(argv[0]); init (); glutReshapeFunc (reshape); glutDisplayFunc (display); glutKeyboardFunc (keyboard); glutMainLoop(); return 0; }