TextureLoader.cpp

#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <GLUT/glut.h>
#else
//#include <windows.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/freeglut.h>
#include <iostream>
#endif

#include "TextureLoader.h"

GLubyte* LoadPPM(char* file, int* width, int* height, int* max)
{
	GLubyte* img;
	FILE *fd;
	int n, m;
	int  k, nm;
	char c;
	int i;
	char b[100];
	float s;
	int red, green, blue;

	fd = fopen(file, "r");
	fscanf(fd,"%[^\n] ",b);
	if(b[0]!='P'|| b[1] != '3')
	{
		printf("%s is not a PPM file!\n",file);
		exit(0);
	}
	printf("%s is a PPM file\n", file);
	fscanf(fd, "%c",&c);
	while(c == '#')
	{
		fscanf(fd, "%[^\n] ", b);
		printf("%s\n",b);
		fscanf(fd, "%c",&c);
	}
	ungetc(c,fd);
	fscanf(fd, "%d %d %d", &n, &m, &k);

	printf("%d rows  %d columns  max value= %d\n",n,m,k);

	nm = n*m;

	img = (GLubyte*)(malloc(3*sizeof(GLuint)*nm));

	s=255.0/k;


	for(i=0;i<nm;i++)
	{
		fscanf(fd,"%d %d %d",&red, &green, &blue );
		img[3*nm-3*i-3]=red*s;
		img[3*nm-3*i-2]=green*s;
		img[3*nm-3*i-1]=blue*s;
	}

	*width = n;
	*height = m;
	*max = k;

	return img;
}