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authorjtg <jtg>1999-08-19 00:55:39 +0000
committerjtg <jtg>1999-08-19 00:55:39 +0000
commitafb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c (patch)
tree59d65b4da12fb5379224cf5f6b808fde91523c7f /progs/redbook/texturesurf.c
parentf2544d4920ce168bec9cd94d774b7ea5103a3d74 (diff)
Initial revision
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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+ * Unpublished-- rights reserved under the copyright laws of the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. */
+}