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发表于 2004-10-25 19:32:00
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Re:【提问】关于红宝书里的两个程序
/*
* Copyright (c) 1993-1999, 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* Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
*/
/*
* convolution.c
* Use various 2D convolutions filters to find edges in an image.
*
*/
#include <GL/glut.h>
#include <stdlib.h>
extern GLubyte* readImage(const char*, GLsizei*, GLsizei*);
GLubyte *pixels;
GLsizei width, height;
GLfloat horizontal[3][3] = {
{ 0, -1, 0 },
{ 0, 1, 0 },
{ 0, 0, 0 }
};
GLfloat vertical[3][3] = {
{ 0, 0, 0 },
{ -1, 1, 0 },
{ 0, 0, 0 }
};
GLfloat laplacian[3][3] = {
{ -0.125, -0.125, -0.125 },
{ -0.125, 1.0 , -0.125 },
{ -0.125, -0.125, -0.125 },
};
void init(void)
{
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glClearColor(0.0, 0.0, 0.0, 0.0);
//printf("Using the horizontal filter\n");
//glEnable(GL_CONVOLUTION_2D);
glConvolutionFilter2D(GL_CONVOLUTION_2D, GL_LUMINANCE, 3, 3, GL_LUMINANCE, GL_FLOAT, horizontal);
glEnable(GL_CONVOLUTION_2D);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glRasterPos2i( 1, 1);
glDrawPixels(width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels);
glFlush();
}
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, w, 0, h, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
}
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'h' :
printf("Using a horizontal filter\n");
glConvolutionFilter2D(GL_CONVOLUTION_2D, GL_LUMINANCE, 3, 3,
GL_LUMINANCE, GL_FLOAT, horizontal);
break;
case 'v' :
printf("Using the vertical filter\n");
glConvolutionFilter2D(GL_CONVOLUTION_2D, GL_LUMINANCE, 3, 3,
GL_LUMINANCE, GL_FLOAT, vertical);
break;
case 'l' :
printf("Using the laplacian filter\n");
glConvolutionFilter2D(GL_CONVOLUTION_2D, GL_LUMINANCE, 3, 3,
GL_LUMINANCE, GL_FLOAT, laplacian);
break;
case 27:
exit(0);
}
glutPostRedisplay();
}
/* Main Loop
* Open window with initial window size, title bar,
* RGBA display mode, and handle input events.
*/
int main(int argc, char** argv)
{
pixels = readImage("Data/leeds.bin", &width, &height);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(width, height);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[0]);
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
/*例8－6convolution.c在编译时提示：
error C2065: “GL_CONVOLUTION_2D” : 未声明的标识符
*/ |
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发表于 2004-10-25 18:11:00
