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netimglut.cpp
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netimglut.cpp
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/*
* Copyright (c) 2014 University of Michigan, Ann Arbor.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of Michigan, Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Author: Sugih Jamin ([email protected])
*
*/
#include <stdio.h> // fprintf(), perror(), fflush()
#include <stdlib.h> // atoi()
#include <assert.h> // assert()
#include <unistd.h> // getopt(), STDIN_FILENO, gethostname()
#include <signal.h> // signal()
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif
#include "netimg.h"
extern int sd;
int wd; /* GLUT window handle */
GLdouble width, height; /* window width and height */
void
netimg_imginit()
{
int tod;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPolygonMode(GL_FRONT, GL_FILL);
glGenTextures(1, (GLuint*) &tod);
glBindTexture(GL_TEXTURE_2D, tod);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_2D);
}
/* Callback functions for GLUT */
void
netimg_display(void)
{
/* If your image is displayed upside down, you'd need to play with the
texture coordinate to flip the image around. */
glBegin(GL_QUADS);
glTexCoord2f(0.0,1.0); glVertex3f(0.0, height, 0.0);
glTexCoord2f(0.0,0.0); glVertex3f(0.0, 0.0, 0.0);
glTexCoord2f(1.0,0.0); glVertex3f(width, 0.0, 0.0);
glTexCoord2f(1.0,1.0); glVertex3f(width, height, 0.0);
glEnd();
glFlush();
}
void
netimg_reshape(int w, int h)
{
/* save new screen dimensions */
width = (GLdouble) w;
height = (GLdouble) h;
/* tell OpenGL to use the whole window for drawing */
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
/* do an orthographic parallel projection with the coordinate
system set to first quadrant, limited by screen/window size */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, width, 0.0, height);
}
void
netimg_kbd(unsigned char key, int x, int y)
{
switch((char)key) {
case 'q':
case 27:
glutDestroyWindow(wd);
close(sd);
#ifdef _WIN32
WSACleanup();
#endif
exit(0);
break;
default:
break;
}
return;
}
void
netimg_glutinit(int *argc, char *argv[], void (*idlefunc)())
{
width = NETIMG_WIDTH; /* initial window width and height, */
height = NETIMG_HEIGHT; /* within which we draw. */
glutInit(argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);
glutInitWindowSize((int) NETIMG_WIDTH, (int) NETIMG_HEIGHT);
wd = glutCreateWindow("Netimg Display" /* title */ ); // wd global
glutDisplayFunc(netimg_display);
glutReshapeFunc(netimg_reshape);
glutKeyboardFunc(netimg_kbd);
glutIdleFunc(idlefunc);
return;
}