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-rw-r--r--progs/redbook/alpha.c143
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diff --git a/progs/redbook/alpha.c b/progs/redbook/alpha.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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-
-/*
- * alpha.c
- * This program draws several overlapping filled polygons
- * to demonstrate the effect order has on alpha blending results.
- * Use the 't' key to toggle the order of drawing polygons.
- */
-#include <GL/glut.h>
-#include <stdlib.h>
-
-static int leftFirst = GL_TRUE;
-
-/* Initialize alpha blending function.
- */
-static void init(void)
-{
- glEnable (GL_BLEND);
- glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glShadeModel (GL_FLAT);
- glClearColor (0.0, 0.0, 0.0, 0.0);
-}
-
-static void drawLeftTriangle(void)
-{
- /* draw yellow triangle on LHS of screen */
-
- glBegin (GL_TRIANGLES);
- glColor4f(1.0, 1.0, 0.0, 0.75);
- glVertex3f(0.1, 0.9, 0.0);
- glVertex3f(0.1, 0.1, 0.0);
- glVertex3f(0.7, 0.5, 0.0);
- glEnd();
-}
-
-static void drawRightTriangle(void)
-{
- /* draw cyan triangle on RHS of screen */
-
- glBegin (GL_TRIANGLES);
- glColor4f(0.0, 1.0, 1.0, 0.75);
- glVertex3f(0.9, 0.9, 0.0);
- glVertex3f(0.3, 0.5, 0.0);
- glVertex3f(0.9, 0.1, 0.0);
- glEnd();
-}
-
-static void display(void)
-{
- glClear(GL_COLOR_BUFFER_BIT);
-
- if (leftFirst) {
- drawLeftTriangle();
- drawRightTriangle();
- }
- else {
- drawRightTriangle();
- drawLeftTriangle();
- }
-
- glFlush();
-}
-
-static void reshape(int w, int h)
-{
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- gluOrtho2D (0.0, 1.0, 0.0, 1.0*(GLfloat)h/(GLfloat)w);
- else
- gluOrtho2D (0.0, 1.0*(GLfloat)w/(GLfloat)h, 0.0, 1.0);
-}
-
-/* ARGSUSED1 */
-static void keyboard(unsigned char key, int x, int y)
-{
- switch (key) {
- case 't':
- case 'T':
- leftFirst = !leftFirst;
- 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;
-}