1// tLodGroup.cpp 
2// 
3// This unit implements scene LOD groups. LOD groups basically specify what model to use based on a size threshold. 
4// The threshold is based on screen-size, not distance. This is much more correct as it allows narrow camera FOVs 
5// without things looking pixelated. 
6// 
7// Copyright (c) 2006, 2017 Tristan Grimmer. 
8// Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby 
9// granted, provided that the above copyright notice and this permission notice appear in all copies. 
10// 
11// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL 
12// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, 
13// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
14// AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 
15// PERFORMANCE OF THIS SOFTWARE. 
16 
17#include "Scene/tLodGroup.h" 
18namespace tScene 
19{ 
20 
21 
22void tLodParam::Save(tChunkWriter& chunk) const 
23{ 
24 chunk.Begin(tChunkID::Scene_LodParam); 
25 { 
26 chunk.Write(ModelID); 
27 chunk.Write(Threshold); 
28 } 
29 chunk.End(); 
30} 
31 
32 
33void tLodParam::Load(const tChunk& chunk) 
34{ 
35 tAssert(chunk.GetID() == tChunkID::Scene_LodParam); 
36 chunk.GetItem(ModelID); 
37 chunk.GetItem(Threshold); 
38} 
39 
40 
41void tLodGroup::Save(tChunkWriter& chunk) const 
42{ 
43 chunk.Begin(tChunkID::Scene_LodGroup); 
44 { 
45 if (!LodParams.IsEmpty()) 
46 { 
47 chunk.Begin(tChunkID::Scene_LodParams); 
48 { 
49 for (tItList<tLodParam>::Iter info = LodParams.First(); info; ++info) 
50 info->Save(chunk); 
51 } 
52 chunk.End(); 
53 } 
54 } 
55 chunk.End(); 
56} 
57 
58 
59void tLodGroup::Load(const tChunk& lodChunk) 
60{ 
61 tAssert(lodChunk.GetID() == tChunkID::Scene_LodGroup); 
62 Clear(); 
63 
64 for (tChunk chunk = lodChunk.First(); chunk.IsValid(); chunk = chunk.Next()) 
65 { 
66 switch (chunk.GetID()) 
67 { 
68 case tChunkID::Scene_Object: 
69 tObject::Load(chunk); 
70 break; 
71 
72 case tChunkID::Scene_LodParams: 
73 for (tChunk info = chunk.First(); info.Valid(); info = info.Next()) 
74 { 
75 switch (info.GetID()) 
76 { 
77 case tChunkID::Scene_LodParam: 
78 LodParams.Append(new tLodParam(info)); 
79 break; 
80 } 
81 } 
82 break; 
83 } 
84 } 
85} 
86 
87 
88} 
89