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-rw-r--r--progs/redbook/aargb.c149
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diff --git a/progs/redbook/aargb.c b/progs/redbook/aargb.c
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-/*
- * 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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-
-/*
- * aargb.c
- * This program draws shows how to draw anti-aliased lines. It draws
- * two diagonal lines to form an X; when 'r' is typed in the window,
- * the lines are rotated in opposite directions.
- */
-#include <GL/glut.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-static float rotAngle = 0.;
-
-/* Initialize antialiasing for RGBA mode, including alpha
- * blending, hint, and line width. Print out implementation
- * specific info on line width granularity and width.
- */
-static void init(void)
-{
- GLfloat values[2];
- glGetFloatv (GL_LINE_WIDTH_GRANULARITY, values);
- printf ("GL_LINE_WIDTH_GRANULARITY value is %3.1f\n", values[0]);
-
- glGetFloatv (GL_LINE_WIDTH_RANGE, values);
- printf ("GL_LINE_WIDTH_RANGE values are %3.1f %3.1f\n",
- values[0], values[1]);
-
- glEnable (GL_LINE_SMOOTH);
- glEnable (GL_BLEND);
- glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE);
- glLineWidth (1.5);
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
-}
-
-/* Draw 2 diagonal lines to form an X
- */
-static void display(void)
-{
- glClear(GL_COLOR_BUFFER_BIT);
-
- glColor3f (0.0, 1.0, 0.0);
- glPushMatrix();
- glRotatef(-rotAngle, 0.0, 0.0, 0.1);
- glBegin (GL_LINES);
- glVertex2f (-0.5, 0.5);
- glVertex2f (0.5, -0.5);
- glEnd ();
- glPopMatrix();
-
- glColor3f (0.0, 0.0, 1.0);
- glPushMatrix();
- glRotatef(rotAngle, 0.0, 0.0, 0.1);
- glBegin (GL_LINES);
- glVertex2f (0.5, 0.5);
- glVertex2f (-0.5, -0.5);
- glEnd ();
- glPopMatrix();
-
- glFlush();
-}
-
-static void reshape(int w, int h)
-{
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- gluOrtho2D (-1.0, 1.0,
- -1.0*(GLfloat)h/(GLfloat)w, 1.0*(GLfloat)h/(GLfloat)w);
- else
- gluOrtho2D (-1.0*(GLfloat)w/(GLfloat)h,
- 1.0*(GLfloat)w/(GLfloat)h, -1.0, 1.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-/* ARGSUSED1 */
-static void keyboard(unsigned char key, int x, int y)
-{
- switch (key) {
- case 'r':
- case 'R':
- rotAngle += 20.;
- if (rotAngle >= 360.) rotAngle = 0.;
- glutPostRedisplay();
- break;
- case 27: /* Escape Key */
- exit(0);
- break;
- default:
- 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 (200, 200);
- glutCreateWindow (argv[0]);
- init();
- glutReshapeFunc (reshape);
- glutKeyboardFunc (keyboard);
- glutDisplayFunc (display);
- glutMainLoop();
- return 0;
-}