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authorjtg <jtg>1999-08-19 00:55:39 +0000
committerjtg <jtg>1999-08-19 00:55:39 +0000
commitafb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c (patch)
tree59d65b4da12fb5379224cf5f6b808fde91523c7f /progs/redbook/fogindex.c
parentf2544d4920ce168bec9cd94d774b7ea5103a3d74 (diff)
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+
+/* Copyright (c) Mark J. Kilgard, 1994. */
+
+/*
+ * (c) Copyright 1993, 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+ * Unpublished-- rights reserved under the copyright laws of the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(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*
+ * fogindex.c
+ * This program demonstrates fog in color index mode.
+ * Three cones are drawn at different z values in a linear
+ * fog. 32 contiguous colors (from 16 to 47) are loaded
+ * with a color ramp.
+ */
+#include <stdlib.h>
+#include <GL/glut.h>
+
+/* Initialize color map and fog. Set screen clear color
+ * to end of color ramp.
+ */
+#define NUM_COLORS 32
+#define RAMPSTART 16
+
+void
+myinit(void)
+{
+ int i;
+
+ glEnable(GL_DEPTH_TEST);
+ glDepthFunc(GL_LESS);
+ for (i = 0; i < NUM_COLORS; i++) {
+ GLfloat shade;
+ shade = (GLfloat) (NUM_COLORS - i) / (GLfloat) NUM_COLORS;
+ glutSetColor(16 + i, shade, shade, shade);
+ }
+ glEnable(GL_FOG);
+
+ glFogi(GL_FOG_MODE, GL_LINEAR);
+ glFogi(GL_FOG_INDEX, NUM_COLORS);
+ glFogf(GL_FOG_START, 0.0);
+ glFogf(GL_FOG_END, 4.0);
+ glHint(GL_FOG_HINT, GL_NICEST);
+ glClearIndex((GLfloat) (NUM_COLORS + RAMPSTART - 1));
+}
+
+/* display() renders 3 cones at different z positions.
+ */
+void
+display(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ glPushMatrix();
+ glTranslatef(-1.0, -1.0, -1.0);
+ glRotatef(-90.0, 1.0, 0.0, 0.0);
+ glIndexi(RAMPSTART);
+ glutSolidCone(1.0, 2.0, 10, 10);
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(0.0, -1.0, -2.25);
+ glRotatef(-90.0, 1.0, 0.0, 0.0);
+ glIndexi(RAMPSTART);
+ glutSolidCone(1.0, 2.0, 10, 10);
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(1.0, -1.0, -3.5);
+ glRotatef(-90.0, 1.0, 0.0, 0.0);
+ glIndexi(RAMPSTART);
+ glutSolidCone(1.0, 2.0, 10, 10);
+ glPopMatrix();
+ glFlush();
+}
+
+void
+myReshape(int w, int h)
+{
+ glViewport(0, 0, w, h);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ if (w <= h)
+ glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,
+ 2.0 * (GLfloat) h / (GLfloat) w, 0.0, 10.0);
+ else
+ glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,
+ 2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, 0.0, 10.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+/* Main Loop
+ * Open window with initial window size, title bar,
+ * RGBA display mode, depth buffer, and handle input events.
+ */
+int
+main(int argc, char **argv)
+{
+ glutInit(&argc, argv);
+ glutInitDisplayMode(GLUT_SINGLE | GLUT_INDEX | GLUT_DEPTH);
+ glutCreateWindow(argv[0]);
+ myinit();
+ glutReshapeFunc(myReshape);
+ glutDisplayFunc(display);
+ glutMainLoop();
+ return 0; /* ANSI C requires main to return int. */
+}