Initial revision

1 files changed, 187 insertions, 0 deletions

diff --git a/progs/redbook/texsub.c b/progs/redbook/texsub.c
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+++ b/progs/redbook/texsub.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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/*  texsub.c
+ *  This program texture maps a checkerboard image onto
+ *  two rectangles.  This program clamps the texture, if
+ *  the texture coordinates fall outside 0.0 and 1.0.
+ *  If the s key is pressed, a texture subimage is used to
+ *  alter the original texture.  If the r key is pressed, 
+ *  the original texture is restored.
+ */
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef GL_VERSION_1_1
+/*  Create checkerboard textures  */
+#define checkImageWidth 64
+#define checkImageHeight 64
+#define subImageWidth 16
+#define subImageHeight 16
+static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
+static GLubyte subImage[subImageHeight][subImageWidth][4];
+
+static GLuint texName;
+
+void makeCheckImages(void)
+{
+   int i, j, c;
+    
+   for (i = 0; i < checkImageHeight; i++) {
+      for (j = 0; j < checkImageWidth; j++) {
+         c = ((((i&0x8)==0)^((j&0x8))==0))*255;
+         checkImage[i][j][0] = (GLubyte) c;
+         checkImage[i][j][1] = (GLubyte) c;
+         checkImage[i][j][2] = (GLubyte) c;
+         checkImage[i][j][3] = (GLubyte) 255;
+      }
+   }
+   for (i = 0; i < subImageHeight; i++) {
+      for (j = 0; j < subImageWidth; j++) {
+         c = ((((i&0x4)==0)^((j&0x4))==0))*255;
+         subImage[i][j][0] = (GLubyte) c;
+         subImage[i][j][1] = (GLubyte) 0;
+         subImage[i][j][2] = (GLubyte) 0;
+         subImage[i][j][3] = (GLubyte) 255;
+      }
+   }
+}
+
+void init(void)
+{    
+   glClearColor (0.0, 0.0, 0.0, 0.0);
+   glShadeModel(GL_FLAT);
+   glEnable(GL_DEPTH_TEST);
+
+   makeCheckImages();
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+   glGenTextures(1, &texName);
+   glBindTexture(GL_TEXTURE_2D, texName);
+
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight, 
+                0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage);
+}
+
+void display(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+   glEnable(GL_TEXTURE_2D);
+   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+   glBindTexture(GL_TEXTURE_2D, texName);
+   glBegin(GL_QUADS);
+   glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
+   glTexCoord2f(0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0);
+   glTexCoord2f(1.0, 1.0); glVertex3f(0.0, 1.0, 0.0);
+   glTexCoord2f(1.0, 0.0); glVertex3f(0.0, -1.0, 0.0);
+
+   glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0);
+   glTexCoord2f(0.0, 1.0); glVertex3f(1.0, 1.0, 0.0);
+   glTexCoord2f(1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421);
+   glTexCoord2f(1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421);
+   glEnd();
+   glFlush();
+   glDisable(GL_TEXTURE_2D);
+}
+
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -3.6);
+}
+
+/* ARGSUSED1 */
+void keyboard (unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 's':
+      case 'S':
+         glBindTexture(GL_TEXTURE_2D, texName);
+         glTexSubImage2D(GL_TEXTURE_2D, 0, 12, 44, subImageWidth,
+                         subImageHeight, GL_RGBA,
+                         GL_UNSIGNED_BYTE, subImage);
+         glutPostRedisplay();
+         break;
+      case 'r':
+      case 'R':
+         glBindTexture(GL_TEXTURE_2D, texName);
+         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
+                      checkImageHeight, 0, GL_RGBA,
+                      GL_UNSIGNED_BYTE, checkImage);
+         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(250, 250);
+   glutInitWindowPosition(100, 100);
+   glutCreateWindow(argv[0]);
+   init();
+   glutDisplayFunc(display);
+   glutReshapeFunc(reshape);
+   glutKeyboardFunc(keyboard);
+   glutMainLoop();
+   return 0; 
+}
+#else
+int main(int argc, char** argv)
+{
+    fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
+    fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
+    fprintf (stderr, "you may be able to modify this program to make it run.\n");
+    return 0;
+}
+#endif