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/*
* File: losparam.h
* Summary: Parameters for the LOS algorithm
*/
#ifndef LOSPARAM_H
#define LOSPARAM_H
// Note: find_ray relies on the fact that 2*OPC_HALF == OPC_OPAQUE.
// On the other hand, losight tracks this explicitly.
enum opacity_type
{
OPC_CLEAR = 0,
OPC_HALF = 1, // for opaque clouds; two or more block
OPC_OPAQUE = 2,
NUM_OPACITIES
};
struct opacity_func
{
virtual ~opacity_func() {}
virtual opacity_type operator()(const coord_def& p) const = 0;
};
struct bounds_func
{
virtual ~bounds_func() {}
virtual bool operator()(const coord_def& p) const = 0;
};
// Default LOS rules.
struct opacity_default : opacity_func
{
opacity_type operator()(const coord_def& p) const;
};
static opacity_default opc_default;
// Default LOS rules, but only consider fully opaque features blocking.
// In particular, clouds don't affect the result.
struct opacity_fullyopaque : opacity_func
{
opacity_type operator()(const coord_def& p) const;
};
static opacity_fullyopaque opc_fullyopaque;
// Make anything solid block in addition to normal LOS.
// XXX: Are trees, bushes solid?
struct opacity_solid : opacity_func
{
opacity_type operator()(const coord_def& p) const;
};
static opacity_solid opc_solid;
// LOS bounded by fixed presquared radius.
struct bounds_radius_sq : bounds_func
{
int radius_sq;
bounds_radius_sq(int r_sq)
: radius_sq(r_sq) {}
bool operator()(const coord_def& p) const;
};
static bounds_radius_sq bds_deflos = bounds_radius_sq(LOS_RADIUS_SQ);
static bounds_radius_sq bds_maxlos = bounds_radius_sq(LOS_MAX_RADIUS_SQ);
// LOS bounded by current global LOS radius.
struct bounds_cur_los_radius : bounds_func
{
bool operator()(const coord_def& p) const;
};
static bounds_cur_los_radius bds_default;
// Subclasses of this are passed to losight() to modify the
// LOS calculation. Implementations will have to translate between
// relative coordinates (-8,-8)..(8,8) and real coordinates,
// specify how opaque the cells are and determine what values
// are written to the visible cells.
struct los_param
{
virtual ~los_param() {}
// Whether the translated coordinate lies within the map
// (including boundary) and within the LOS area
virtual bool los_bounds(const coord_def& p) const = 0;
// appearance(p) will be copied to show(sh_o+p) for visible p.
virtual unsigned appearance(const coord_def& p) const = 0;
virtual opacity_type opacity(const coord_def& p) const = 0;
};
#endif
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