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.
/* * 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 * Unpublished-- rights reserved under the copyright laws of the * United States.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> #include <stdio.h> #define stripeImageWidth 32 GLubyte stripeImage[4*stripeImageWidth]; #ifdef GL_VERSION_1_1 static GLuint texName; #endif 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; 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); } 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(); } 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 */ 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; }