156 lines
5.0 KiB
C
156 lines
5.0 KiB
C
|
|
/* 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* Unpublished-- rights reserved under the copyright laws of the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);
|
|
}
|
|
|
|
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. */
|
|
}
|