OpenGLUT 0.6.3 development - OpenGLUT: texturesurf.c File Reference
Keywords: OpenGLUT, FreeGLUT, OpenGL, GLUT, X11, Windows, Programming, Documentation, Download, Development, Sourceforge

OpenGLUT Documentation
Introduction | Documentation | Examples | Proposals | Authors | Copying | Todo | Bugs | Links

# texturesurf.c File Reference

## Detailed Description

This program uses evaluators to generate a curved surface and automatically generated texture coordinates.

    /* 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     * Unpublished-- rights reserved under the copyright laws of the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.
     */

    #include <GL/openglut.h>
    #include <stdlib.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);
    }

    static void
    key(unsigned char k, int x, int y)
    {
      switch (k) {
      case 27:  /* Escape */
        exit(0);
        break;
      default:
        return;
      }
      glutPostRedisplay();
    }

    int main(int argc, char** argv)
    {
        glutInit(&argc, argv);
        glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
        glutCreateWindow (argv[0]);
        myinit();
        glutReshapeFunc (myReshape);
        glutDisplayFunc(display);
        glutKeyboardFunc(key);
        glutMainLoop();
        return 0;             /* ANSI C requires main to return int. */
    }

OpenGLUT Development @ Sourceforge
Homepage | Summary | Files | CVS | Forums | Lists | Bugs | RFE
Generated on Tue Oct 5 18:44:30 2004 for OpenGLUT by doxygen 1.3.8
The OpenGLUT project is hosted by sourceforge.net.