opengl_functions.c

The OpenGPSRec receiver software runs on the real time operating system RTAI-Linux. It compiles with

#include <GL/glut.h>    // Header File For The GLUT Library 
#include <GL/gl.h>      // Header File For The OpenGL32 Library
#include <GL/glu.h>      // Header File For The GLu32 Library

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

#include "../include/port.h"
#include "../include/ogr_defines.h"
#include "../include/ogr_structs.h"

#include "defines.h"
#include "globals.h"

#include "opengl_functions.h"

//------------------------------------------------------------------------------
//  DrawText12() 
//  
// Draws text on an OpenGL window
//
void
DrawText12(GLint x, GLint y, char* s, GLfloat r, GLfloat g, GLfloat b)
{
    int lines;
    char* p;

    glMatrixMode(GL_PROJECTION);
     glPushMatrix();
     glLoadIdentity();
     glOrtho(0.0, glutGet(GLUT_WINDOW_WIDTH), 
	    0.0, glutGet(GLUT_WINDOW_HEIGHT), -1.0, 1.0);
     glMatrixMode(GL_MODELVIEW);
      glPushMatrix();
      glLoadIdentity();
	  
      glColor3f(r,g,b);
      glRasterPos2i(x, y);
      for(p = s, lines = 0; *p; p++) {
	  if (*p == '\n') {
	      lines++;
	      glRasterPos2i(x, y-(lines*12));
	  }
	  glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, *p);
      }
      glPopMatrix();
     glMatrixMode(GL_PROJECTION);
     glPopMatrix();
     glMatrixMode(GL_MODELVIEW);
}


//------------------------------------------------------------------------------
//  DrawText10() 
//  
// Draws text on an OpenGL window
//
void
DrawTextScale(GLfloat x, GLfloat y, char* s, GLfloat r, GLfloat g, GLfloat b)
{
    int lines;
    char* p;
	  
      glColor3f(r,g,b);
      glRasterPos2f(x, y);
      for(p = s, lines = 0; *p; p++) {
	  if (*p == '\n') {
	      lines++;
	      glRasterPos2i(x, y-(lines*0.2f));
	  }
	  glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, *p);
      }
}

//------------------------------------------------------------------------------
// readCharList
//
// Given a list (buf) of comma separated integers, this
// function will extract the individual list items
// and return a list (listItems) of (numItems).
//
// RETURNS: 0 if no items in list, otherwise 1 if items found
//
int readCharList(char *buf, char *listItems[], int *numItems) 
{

    char *pch; /* Character pointer */
    int count=0;

    pch=strtok(buf,",\n ");

    while(pch!=NULL) {
        strcpy(listItems[count],pch);
        count++;
        pch=strtok(NULL,",\n ");
    }

    *numItems=count;

    if (count==0)
        return 0;
    else
        return 1;
}