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-rw-r--r--progs/redbook/texgen.c207
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diff --git a/progs/redbook/texgen.c b/progs/redbook/texgen.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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-
-/* texgen.c
- * This program draws a texture mapped teapot with
- * automatically generated texture coordinates. The
- * texture is rendered as stripes on the teapot.
- * Initially, the object is drawn with texture coordinates
- * based upon the object coordinates of the vertex
- * and distance from the plane x = 0. Pressing the 'e'
- * key changes the coordinate generation to eye coordinates
- * of the vertex. Pressing the 'o' key switches it back
- * to the object coordinates. Pressing the 's' key
- * changes the plane to a slanted one (x + y + z = 0).
- * Pressing the 'x' key switches it back to x = 0.
- */
-
-#include <GL/glut.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#define stripeImageWidth 32
-GLubyte stripeImage[4*stripeImageWidth];
-
-#ifdef GL_VERSION_1_1
-static GLuint texName;
-#endif
-
-static void makeStripeImage(void)
-{
- int j;
-
- for (j = 0; j < stripeImageWidth; j++) {
- stripeImage[4*j] = (GLubyte) ((j<=4) ? 255 : 0);
- stripeImage[4*j+1] = (GLubyte) ((j>4) ? 255 : 0);
- stripeImage[4*j+2] = (GLubyte) 0;
- stripeImage[4*j+3] = (GLubyte) 255;
- }
-}
-
-/* planes for texture coordinate generation */
-static GLfloat xequalzero[] = {1.0, 0.0, 0.0, 0.0};
-static GLfloat slanted[] = {1.0, 1.0, 1.0, 0.0};
-static GLfloat *currentCoeff;
-static GLenum currentPlane;
-static GLint currentGenMode;
-
-static void init(void)
-{
- glClearColor (0.0, 0.0, 0.0, 0.0);
- glEnable(GL_DEPTH_TEST);
- glShadeModel(GL_SMOOTH);
-
- makeStripeImage();
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
-#ifdef GL_VERSION_1_1
- glGenTextures(1, &texName);
- glBindTexture(GL_TEXTURE_1D, texName);
-#endif
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-#ifdef GL_VERSION_1_1
- glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA, stripeImageWidth, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, stripeImage);
-#else
- glTexImage1D(GL_TEXTURE_1D, 0, 4, stripeImageWidth, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, stripeImage);
-#endif
-
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- currentCoeff = xequalzero;
- currentGenMode = GL_OBJECT_LINEAR;
- currentPlane = GL_OBJECT_PLANE;
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, currentGenMode);
- glTexGenfv(GL_S, currentPlane, currentCoeff);
-
- glEnable(GL_TEXTURE_GEN_S);
- glEnable(GL_TEXTURE_1D);
- glEnable(GL_CULL_FACE);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glEnable(GL_AUTO_NORMAL);
- glEnable(GL_NORMALIZE);
- glFrontFace(GL_CW);
- glCullFace(GL_BACK);
- glMaterialf (GL_FRONT, GL_SHININESS, 64.0);
-}
-
-static void display(void)
-{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- glPushMatrix ();
- glRotatef(45.0, 0.0, 0.0, 1.0);
-#ifdef GL_VERSION_1_1
- glBindTexture(GL_TEXTURE_1D, texName);
-#endif
- glutSolidTeapot(2.0);
- glPopMatrix ();
- glFlush();
-}
-
-static void reshape(int w, int h)
-{
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- glOrtho (-3.5, 3.5, -3.5*(GLfloat)h/(GLfloat)w,
- 3.5*(GLfloat)h/(GLfloat)w, -3.5, 3.5);
- else
- glOrtho (-3.5*(GLfloat)w/(GLfloat)h,
- 3.5*(GLfloat)w/(GLfloat)h, -3.5, 3.5, -3.5, 3.5);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-/* ARGSUSED1 */
-static void keyboard (unsigned char key, int x, int y)
-{
- switch (key) {
- case 'e':
- case 'E':
- currentGenMode = GL_EYE_LINEAR;
- currentPlane = GL_EYE_PLANE;
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, currentGenMode);
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 'o':
- case 'O':
- currentGenMode = GL_OBJECT_LINEAR;
- currentPlane = GL_OBJECT_PLANE;
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, currentGenMode);
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 's':
- case 'S':
- currentCoeff = slanted;
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 'x':
- case 'X':
- currentCoeff = xequalzero;
- glTexGenfv(GL_S, currentPlane, currentCoeff);
- glutPostRedisplay();
- break;
- case 27:
- exit(0);
- break;
- default:
- break;
- }
-}
-
-int main(int argc, char** argv)
-{
- glutInit(&argc, argv);
- glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowSize(256, 256);
- glutInitWindowPosition(100, 100);
- glutCreateWindow (argv[0]);
- init ();
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyboard);
- glutMainLoop();
- return 0;
-}
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