Initial revision

1 files changed, 207 insertions, 0 deletions

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+ * Unpublished-- rights reserved under the copyright laws of the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