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Diffstat (limited to 'progs/redbook/texturesurf.c')
| -rw-r--r-- | progs/redbook/texturesurf.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/progs/redbook/texturesurf.c b/progs/redbook/texturesurf.c new file mode 100644 index 00000000000..89cdbcc6526 --- /dev/null +++ b/progs/redbook/texturesurf.c @@ -0,0 +1,141 @@ + +/* 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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. */ +} |