ppm.h

#ifndef _PPM_H_
#define _PPM_H_

#include <string>
#include <cstdlib>
#include <cstdio>
#include <vector>

#include "material.h"

namespace edupt {

inline double clamp(double x){ 
	if (x < 0.0)
		return 0.0;
	if (x > 1.0)
		return 1.0;
	return x;
} 

inline int to_int(double x){
	return int(pow(clamp(x), 1/2.2) * 255 + 0.5);
}

void save_ppm_file(const std::string &filename, const Color *image, const int width, const int height) {
	FILE *f = fopen(filename.c_str(), "wb");
	fprintf(f, "P3\n%d %d\n%d\n", width, height, 255);
	for (int i = 0; i < width * height; i++)
		fprintf(f,"%d %d %d ", to_int(image[i].x), to_int(image[i].y), to_int(image[i].z));
	fclose(f);
}


};

#endif