139 lines
4.8 KiB
C
139 lines
4.8 KiB
C
/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/* texturesurf.c
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* This program uses evaluators to generate a curved
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* surface and automatically generated texture coordinates.
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*/
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#include <windows.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "glaux.h"
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#include <math.h>
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GLfloat ctrlpoints[4][4][3] = {
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{{ -1.5, -1.5, 4.0}, { -0.5, -1.5, 2.0},
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{0.5, -1.5, -1.0}, {1.5, -1.5, 2.0}},
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{{ -1.5, -0.5, 1.0}, { -0.5, -0.5, 3.0},
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{0.5, -0.5, 0.0}, {1.5, -0.5, -1.0}},
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{{ -1.5, 0.5, 4.0}, { -0.5, 0.5, 0.0},
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{0.5, 0.5, 3.0}, {1.5, 0.5, 4.0}},
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{{ -1.5, 1.5, -2.0}, { -0.5, 1.5, -2.0},
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{0.5, 1.5, 0.0}, {1.5, 1.5, -1.0}}
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};
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GLfloat texpts[2][2][2] = {{{0.0, 0.0}, {0.0, 1.0}},
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{{1.0, 0.0}, {1.0, 1.0}}};
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glColor3f(1.0, 1.0, 1.0);
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glEvalMesh2(GL_FILL, 0, 20, 0, 20);
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glFlush();
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}
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#define imageWidth 64
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#define imageHeight 64
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GLubyte image[3*imageWidth*imageHeight];
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void makeImage(void)
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{
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int i, j;
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float ti, tj;
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for (i = 0; i < imageWidth; i++) {
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ti = 2.0*3.14159265*i/imageWidth;
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for (j = 0; j < imageHeight; j++) {
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tj = 2.0*3.14159265*j/imageHeight;
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image[3*(imageHeight*i+j)] = (GLubyte) 127*(1.0+sin(ti));
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image[3*(imageHeight*i+j)+1] = (GLubyte) 127*(1.0+cos(2*tj));
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image[3*(imageHeight*i+j)+2] = (GLubyte) 127*(1.0+cos(ti+tj));
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}
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}
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}
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void myinit(void)
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{
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glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4,
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0, 1, 12, 4, &ctrlpoints[0][0][0]);
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glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2,
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0, 1, 4, 2, &texpts[0][0][0]);
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glEnable(GL_MAP2_TEXTURE_COORD_2);
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glEnable(GL_MAP2_VERTEX_3);
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glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);
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makeImage();
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexImage2D(GL_TEXTURE_2D, 0, 3, imageWidth, imageHeight, 0,
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GL_RGB, GL_UNSIGNED_BYTE, image);
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glEnable(GL_TEXTURE_2D);
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_NORMALIZE);
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glShadeModel (GL_FLAT);
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}
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void myReshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if (w <= h)
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glOrtho(-4.0, 4.0, -4.0*(GLfloat)h/(GLfloat)w,
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4.0*(GLfloat)h/(GLfloat)w, -4.0, 4.0);
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else
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glOrtho(-4.0*(GLfloat)w/(GLfloat)h,
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4.0*(GLfloat)w/(GLfloat)h, -4.0, 4.0, -4.0, 4.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRotatef(85.0, 1.0, 1.0, 1.0);
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}
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int main(int argc, char** argv)
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{
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auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH16);
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auxInitPosition (100, 50, 300, 300);
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auxInitWindow (argv[0]);
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myinit();
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auxReshapeFunc (myReshape);
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auxMainLoop(display);
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}
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