Libs/MaterialSystem/Common/DepRelMatrix.cpp

   1 /*
   2 Cafu Engine, http://www.cafu.de/
   3 Copyright (c) Carsten Fuchs and other contributors.
   4 This project is licensed under the terms of the MIT license.
   5 */
   6
   7 /****************************************/
   8 /*** Dependency Relationship Matrices ***/
   9 /****************************************/
  10
  11 #include "DepRelMatrix.hpp"
  12
  13
  14 unsigned long DepRelMatrixT::GlobalIDCount=0;
  15
  16
  17 DepRelMatrixT::DepRelMatrixT()
  18     : Age(0),
  19       ID(GlobalIDCount++)
  20 {
  21 }
  22
  23
  24 DepRelMatrixT::DepRelMatrixT(const DepRelMatrixT& Other)
  25     : Matrix(Other.Matrix),
  26       Age(0),
  27       ID(GlobalIDCount++)
  28 {
  29 }
  30
  31
  32
  33
  34 InverseMatrixT::InverseMatrixT(DepRelMatrixT* Source)
  35     : m_Source(Source)
  36 {
  37 }
  38
  39
  40 void InverseMatrixT::SetSourceMatrix(DepRelMatrixT* Source)
  41 {
  42     m_Source=Source;
  43 }
  44
  45
  46 void InverseMatrixT::Update()
  47 {
  48     // First make recursively sure that the source matrix is up-to-date.
  49     m_Source->Update();
  50
  51     // Now see if updating the source actually aged (changed) it.
  52     if (m_Source->Age > Age)
  53     {
  54         Matrix=m_Source->Matrix.GetInverse();
  55         Age   =m_Source->Age;
  56     }
  57 }
  58
  59
  60
  61
  62 ProductMatrixT::ProductMatrixT(DepRelMatrixT& A, DepRelMatrixT& B)
  63     : m_A(A), m_B(B)
  64 {
  65 }
  66
  67
  68 void ProductMatrixT::Update()
  69 {
  70     // First make recursively sure that the sources are up-to-date.
  71     m_A.Update();
  72     m_B.Update();
  73
  74     // Now see if updating them actually aged (changed) them.
  75     if (m_A.Age+m_B.Age > Age)
  76     {
  77         Matrix=m_A.Matrix*m_B.Matrix;
  78         Age   =m_A.Age+m_B.Age;
  79     }
  80 }