Cube  Diff

// worldlight.cpp

#include "cube.h"

#import "DynamicEntity.h"
#import "Entity.h"
#import "PersistentEntity.h"

extern bool hasoverbright;

VAR(lightscale, 1, 4, 100);

// done in realtime, needs to be fast
void
lightray(float bx, float by, PersistentEntity *light)
{
	float lx = light.x + (rnd(21) - 10) * 0.1f;
	float ly = light.y + (rnd(21) - 10) * 0.1f;
	float dx = bx - lx;
	float dy = by - ly;
	float dist = (float)sqrt(dx * dx + dy * dy);
	if (dist < 1.0f)

	    fast_f2nat(l / (float)steps); // incorrect: light will fade quicker
	                                  // if near edge of the world

	if (hasoverbright) {
		l /= lightscale;
		stepl /= lightscale;

		if (light.attr3 ||
		    light.attr4) // coloured light version, special case because
		                 // most lights are white
		{

			int dimness = rnd(
			    (255 -
			        (light.attr2 + light.attr3 + light.attr4) / 3) /
			        16 +
			    1);
			x += stepx * dimness;
			y += stepy * dimness;

			y += stepy;
			l -= stepl;
		}
	}
}

void
calclightsource(PersistentEntity *l)
{
	int reach = l.attr1;
	int sx = l.x - reach;
	int ex = l.x + reach;
	int sy = l.y - reach;
	int ey = l.y + reach;

		dlights = [[OFMutableData alloc]
		    initWithItemSize:sizeof(struct block *)];

	// backup area before rendering in dynlight
	struct block *copy = blockcopy(&b);
	[dlights addItem:&copy];

	PersistentEntity *l = [Entity entity];
	l.x = v->x;
	l.y = v->y;
	l.z = v->z;
	l.attr1 = reach;
	l.type = LIGHT;
	l.attr2 = strength;
	calclightsource(l);