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1 files changed, 141 insertions, 0 deletions

diff --git a/progs/redbook/texturesurf.c b/progs/redbook/texturesurf.c
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+
+/* Copyright (c) Mark J. Kilgard, 1994. */
+
+/*
+ * (c) Copyright 1993, 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+ * Unpublished-- rights reserved under the copyright laws of the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(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*  texturesurf.c
+ *  This program uses evaluators to generate a curved
+ *  surface and automatically generated texture coordinates.
+ */
+
+#include <stdlib.h>
+#include <GL/glut.h>
+#include <math.h>
+
+GLfloat ctrlpoints[4][4][3] = {
+    {{ -1.5, -1.5, 4.0}, { -0.5, -1.5, 2.0}, 
+	{0.5, -1.5, -1.0}, {1.5, -1.5, 2.0}}, 
+    {{ -1.5, -0.5, 1.0}, { -0.5, -0.5, 3.0}, 
+	{0.5, -0.5, 0.0}, {1.5, -0.5, -1.0}}, 
+    {{ -1.5, 0.5, 4.0}, { -0.5, 0.5, 0.0}, 
+	{0.5, 0.5, 3.0}, {1.5, 0.5, 4.0}}, 
+    {{ -1.5, 1.5, -2.0}, { -0.5, 1.5, -2.0}, 
+	{0.5, 1.5, 0.0}, {1.5, 1.5, -1.0}}
+};
+
+GLfloat texpts[2][2][2] = {{{0.0, 0.0}, {0.0, 1.0}}, 
+			{{1.0, 0.0}, {1.0, 1.0}}};
+
+void display(void)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glColor3f(1.0, 1.0, 1.0);
+    glEvalMesh2(GL_FILL, 0, 20, 0, 20);
+    glFlush();
+}
+
+#define	imageWidth 64
+#define	imageHeight 64
+GLubyte image[3*imageWidth*imageHeight];
+
+void makeImage(void)
+{
+    int i, j;
+    float ti, tj;
+    
+    for (i = 0; i < imageWidth; i++) {
+	ti = 2.0*3.14159265*i/imageWidth;
+	for (j = 0; j < imageHeight; j++) {
+	    tj = 2.0*3.14159265*j/imageHeight;
+
+	    image[3*(imageHeight*i+j)] = (GLubyte) 127*(1.0+sin(ti));
+	    image[3*(imageHeight*i+j)+1] = (GLubyte) 127*(1.0+cos(2*tj));
+	    image[3*(imageHeight*i+j)+2] = (GLubyte) 127*(1.0+cos(ti+tj));
+	}
+    }
+}
+
+void myinit(void)
+{
+    glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4,
+	    0, 1, 12, 4, &ctrlpoints[0][0][0]);
+    glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2, 
+	    0, 1, 4, 2, &texpts[0][0][0]);
+    glEnable(GL_MAP2_TEXTURE_COORD_2);
+    glEnable(GL_MAP2_VERTEX_3);
+    glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
+    makeImage();
+    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexImage2D(GL_TEXTURE_2D, 0, 3, imageWidth, imageHeight, 0,
+		 GL_RGB, GL_UNSIGNED_BYTE, image);
+    glEnable(GL_TEXTURE_2D);
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_NORMALIZE);
+    glShadeModel (GL_FLAT);
+}
+
+void myReshape(int w, int h)
+{
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    if (w <= h)
+	glOrtho(-4.0, 4.0, -4.0*(GLfloat)h/(GLfloat)w, 
+	    4.0*(GLfloat)h/(GLfloat)w, -4.0, 4.0);
+    else
+	glOrtho(-4.0*(GLfloat)w/(GLfloat)h, 
+	    4.0*(GLfloat)w/(GLfloat)h, -4.0, 4.0, -4.0, 4.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glRotatef(85.0, 1.0, 1.0, 1.0);
+}
+
+int main(int argc, char** argv)
+{
+    glutInit(&argc, argv);
+    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
+    glutCreateWindow (argv[0]);
+    myinit();
+    glutReshapeFunc (myReshape);
+    glutDisplayFunc(display);
+    glutMainLoop();
+    return 0;             /* ANSI C requires main to return int. */
+}