1// tLight.h 
2// 
3// This file implements scene lights. It supports point, spot, directional, and ambient lights. 
4// 
5// Copyright (c) 2006, 2017 Tristan Grimmer. 
6// Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby 
7// granted, provided that the above copyright notice and this permission notice appear in all copies. 
8// 
9// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL 
10// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, 
11// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
12// AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 
13// PERFORMANCE OF THIS SOFTWARE. 
14 
15#pragma once 
16#include "Scene/tObject.h" 
17namespace tScene 
18{ 
19 
20 
21class tLight : public tObject 
22{ 
23public: 
24 tLight() { } 
25 tLight(const tChunk& chunk) { Load(chunk); } 
26 virtual ~tLight() { } 
27 
28 void Save(tChunkWriter&) const; 
29 void Load(const tChunk&); 
30 void Clear(); 
31 void Scale(float scale) /* Scaling affects the near and far attenuation. */ { AttenNearStart *= scale; AttenNearEnd *= scale; AttenFarStart *= scale; AttenFarEnd *= scale; } 
32 
33 enum class tType 
34 { 
35 Point, 
36 Spot, 
37 Directional, 
38 Ambient 
39 }; 
40 
41 // State like the position and direction can be found in the transformation matrix of the light instance. 
42 tType Type = tType::Point; 
43 float AttenNearStart = 0.0f; 
44 float AttenNearEnd = 0.0f; 
45 float AttenFarStart = 0.0f; 
46 float AttenFarEnd = 0.0f; 
47}; 
48 
49 
50} 
51