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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+ * Unpublished-- rights reserved under the copyright laws of the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
+
+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;
+}
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