nuclear@0: #include "brdf.h"
nuclear@0: #include "erebus_impl.h"
nuclear@0: 
nuclear@0: ReflAttrib::ReflAttrib()
nuclear@0: 	: value(1), color(1, 1, 1), map(0)
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: ReflAttrib::ReflAttrib(const Color &col, Texture *tex)
nuclear@0: {
nuclear@0: 	set_color(col);
nuclear@0: 	map = tex;
nuclear@0: }
nuclear@0: 
nuclear@0: void ReflAttrib::set_value(float val)
nuclear@0: {
nuclear@0: 	value = val;
nuclear@0: 	color = Color{val, val, val};
nuclear@0: }
nuclear@0: 
nuclear@0: void ReflAttrib::set_color(const Color &col)
nuclear@0: {
nuclear@0: 	color = col;
nuclear@0: 	value = color_luminance(col);
nuclear@0: }
nuclear@0: 
nuclear@0: void ReflAttrib::set_map(Texture *tex)
nuclear@0: {
nuclear@0: 	map = tex;
nuclear@0: }
nuclear@0: 
nuclear@0: Texture *ReflAttrib::get_map() const
nuclear@0: {
nuclear@0: 	return map;
nuclear@0: }
nuclear@0: 
nuclear@0: float ReflAttrib::get_value() const
nuclear@0: {
nuclear@0: 	return value;
nuclear@0: }
nuclear@0: 
nuclear@0: float ReflAttrib::get_value(float u, float v) const
nuclear@0: {
nuclear@0: 	return map ? value * color_luminance(map->lookup(u, v)) : value;
nuclear@0: }
nuclear@0: 
nuclear@0: const Color &ReflAttrib::get_color() const
nuclear@0: {
nuclear@0: 	return color;
nuclear@0: }
nuclear@0: 
nuclear@0: Color ReflAttrib::get_color(float u, float v) const
nuclear@0: {
nuclear@0: 	return map ? color * map->lookup(u, v) : color;
nuclear@0: }
nuclear@0: 
nuclear@0: // ---- class Reflectance ----
nuclear@0: ReflAttrib Reflectance::def_attrib;
nuclear@0: 
nuclear@0: Reflectance::Reflectance()
nuclear@0: {
nuclear@0: 	set_default_attribs();
nuclear@0: }
nuclear@0: 
nuclear@0: void Reflectance::set_attrib(const char *name, const Color &color, Texture *tex)
nuclear@0: {
nuclear@0: 	attrib[name] = ReflAttrib{color, tex};
nuclear@0: }
nuclear@0: 
nuclear@0: ReflAttrib &Reflectance::get_attrib(const char *name)
nuclear@0: {
nuclear@0: 	auto it = attrib.find(name);
nuclear@0: 	if(it == attrib.end()) {
nuclear@0: 		return def_attrib;
nuclear@0: 	}
nuclear@0: 	return it->second;
nuclear@0: }
nuclear@0: 
nuclear@0: const ReflAttrib &Reflectance::get_attrib(const char *name) const
nuclear@0: {
nuclear@0: 	auto it = attrib.find(name);
nuclear@0: 	if(it == attrib.end()) {
nuclear@0: 		return def_attrib;
nuclear@0: 	}
nuclear@0: 	return it->second;
nuclear@0: }
nuclear@0: 
nuclear@0: float Reflectance::get_attrib_value(const char *name) const
nuclear@0: {
nuclear@0: 	return get_attrib(name).get_value();
nuclear@0: }
nuclear@0: 
nuclear@0: float Reflectance::get_attrib_value(const char *name, float u, float v) const
nuclear@0: {
nuclear@0: 	return get_attrib(name).get_value(u, v);
nuclear@0: }
nuclear@0: 
nuclear@0: Color Reflectance::get_attrib_color(const char *name) const
nuclear@0: {
nuclear@0: 	return get_attrib(name).get_color();
nuclear@0: }
nuclear@0: 
nuclear@0: Color Reflectance::get_attrib_color(const char *name, float u, float v) const
nuclear@0: {
nuclear@0: 	return get_attrib(name).get_color(u, v);
nuclear@0: }
nuclear@0: 
nuclear@0: float Reflectance::sample(const Vector3 &norm, const Vector3 &outdir, Vector3 *indir) const
nuclear@0: {
nuclear@0: 	*indir = sample_dir(norm, outdir);
nuclear@0: 	return eval(norm, outdir, *indir);
nuclear@0: }
nuclear@0: 
nuclear@0: // --- class LambertRefl ---
nuclear@0: 
nuclear@0: void LambertRefl::set_default_attribs()
nuclear@0: {
nuclear@0: 	set_attrib("color", Color(1, 1, 1));
nuclear@0: }
nuclear@0: 
nuclear@0: Vector3 LambertRefl::sample_dir(const Vector3 &norm, const Vector3 &outdir) const
nuclear@0: {
nuclear@0: 	Vector3 dir = Vector3{randf(-1, 1), randf(-1, 1), randf(-1, 1)}.normalized();
nuclear@0: 	return dot_product(dir, norm) < 0.0 ? -dir : dir;
nuclear@0: }
nuclear@0: 
nuclear@0: float LambertRefl::eval(const Vector3 &norm, const Vector3 &outdir, const Vector3 &indir) const
nuclear@0: {
nuclear@0: 	return dot_product(norm, outdir);
nuclear@0: }