#include <stdio.h>
#include "typedefs.h"
#include "maindecl.h"

#define FAR_AWAY 99.99E+20

void raytrace(int depth, t_3d *pos, t_3d *ray, t_color *color)
{
	int objhit, i;
	double d, dist;
	t_3d hit, normal;

	color->r = color->g = color->b = 0.0;
	
	if (depth < 0) {
		color->r = background.r;
		color->g = background.g;
		color->b = background.b;
		return;
	}
	
	objhit = -1;
	dist = FAR_AWAY;
	for (i = 0; i < nobject; i++) {
		d = (*objint[object[i].objtyp])(pos, ray, &object[i]);
		if ((d > 0.0) && (d <= dist)) {
			objhit = i;
			dist = d;
		}
	}
	
	if (objhit < 0) {
		color->r = background.r;
		color->g = background.g;
		color->b = background.b;
		return;
	}

	hit.x = pos->x + dist * ray->x;
	hit.y = pos->y + dist * ray->y;
	hit.z = pos->z + dist * ray->z;
	
	(*objnrm[object[objhit].objtyp])
		(&hit, &object[objhit], &normal);
	
	shade(&hit, ray, &normal, &object[objhit], color);

}

int main(int argc, char **argv)
{
	int line_y, pixel_x, depth;
	t_3d scrnx, scrny, firstray, ray;
	t_color color;
	double line[SCREENWIDTH][3];

	setup();
	viewing(&scrnx, &scrny, &firstray);
	startpic(outfilename, sizey, sizex);
	depth = 0;
	for (line_y = 0; line_y < sizey; line_y++) {
		for (pixel_x = 0; pixel_x < sizex; pixel_x++) {
			ray.x = firstray.x + pixel_x * scrnx.x - line_y * scrny.x;
			ray.y = firstray.y + pixel_x * scrnx.y - line_y * scrny.y;
			ray.z = firstray.z + pixel_x * scrnx.z - line_y * scrny.z;
			normalize(&ray);
			raytrace(0, &eyep, &ray, &color);
			line[pixel_x][0] = color.r;
			line[pixel_x][1] = color.g;
			line[pixel_x][2] = color.b;
		}
		linepic(line);
		/* if (line_y % 10 == 0) { */
		/* 	printf("done line %d\n", line_y); */
		/* 	fflush(stdout); */
		/* } */
	}
	endpic();
	return 0;
}