source/graphics/Decal.cpp

   1 /* Copyright (C) 2022 Wildfire Games.
   2  * This file is part of 0 A.D.
   3  *
   4  * 0 A.D. is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * 0 A.D. is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "precompiled.h"
  19
  20 #include "Decal.h"
  21
  22 #include "graphics/Terrain.h"
  23 #include "maths/MathUtil.h"
  24 #include "ps/CStrInternStatic.h"
  25
  26 CModelAbstract* CModelDecal::Clone() const
  27 {
  28         CModelDecal* clone = new CModelDecal(m_Terrain, m_Decal);
  29         return clone;
  30 }
  31
  32 void CModelDecal::CalcVertexExtents(ssize_t& i0, ssize_t& j0, ssize_t& i1, ssize_t& j1)
  33 {
  34         CVector3D corner0(m_Decal.m_OffsetX + m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ + m_Decal.m_SizeZ/2);
  35         CVector3D corner1(m_Decal.m_OffsetX + m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ - m_Decal.m_SizeZ/2);
  36         CVector3D corner2(m_Decal.m_OffsetX - m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ - m_Decal.m_SizeZ/2);
  37         CVector3D corner3(m_Decal.m_OffsetX - m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ + m_Decal.m_SizeZ/2);
  38
  39         corner0 = GetTransform().Transform(corner0);
  40         corner1 = GetTransform().Transform(corner1);
  41         corner2 = GetTransform().Transform(corner2);
  42         corner3 = GetTransform().Transform(corner3);
  43
  44         i0 = floor(std::min(std::min(corner0.X, corner1.X), std::min(corner2.X, corner3.X)) / TERRAIN_TILE_SIZE);
  45         j0 = floor(std::min(std::min(corner0.Z, corner1.Z), std::min(corner2.Z, corner3.Z)) / TERRAIN_TILE_SIZE);
  46         i1 = ceil(std::max(std::max(corner0.X, corner1.X), std::max(corner2.X, corner3.X)) / TERRAIN_TILE_SIZE);
  47         j1 = ceil(std::max(std::max(corner0.Z, corner1.Z), std::max(corner2.Z, corner3.Z)) / TERRAIN_TILE_SIZE);
  48
  49         i0 = Clamp<ssize_t>(i0, 0, m_Terrain->GetVerticesPerSide() - 1);
  50         j0 = Clamp<ssize_t>(j0, 0, m_Terrain->GetVerticesPerSide() - 1);
  51         i1 = Clamp<ssize_t>(i1, 0, m_Terrain->GetVerticesPerSide() - 1);
  52         j1 = Clamp<ssize_t>(j1, 0, m_Terrain->GetVerticesPerSide() - 1);
  53 }
  54
  55 void CModelDecal::CalcBounds()
  56 {
  57         ssize_t i0, j0, i1, j1;
  58         CalcVertexExtents(i0, j0, i1, j1);
  59         m_WorldBounds = m_Terrain->GetVertexesBound(i0, j0, i1, j1);
  60 }
  61
  62 void CModelDecal::SetTerrainDirty(ssize_t i0, ssize_t j0, ssize_t i1, ssize_t j1)
  63 {
  64         // Check if there's no intersection between the dirty range and this decal
  65         ssize_t bi0, bj0, bi1, bj1;
  66         CalcVertexExtents(bi0, bj0, bi1, bj1);
  67         if (bi1 < i0 || bi0 > i1 || bj1 < j0 || bj0 > j1)
  68                 return;
  69
  70         SetDirty(RENDERDATA_UPDATE_VERTICES);
  71 }
  72
  73 void CModelDecal::InvalidatePosition()
  74 {
  75         m_PositionValid = false;
  76 }
  77
  78 void CModelDecal::ValidatePosition()
  79 {
  80         if (m_PositionValid)
  81         {
  82                 ENSURE(!m_Parent || m_Parent->m_PositionValid);
  83                 return;
  84         }
  85
  86         if (m_Parent && !m_Parent->m_PositionValid)
  87         {
  88                 // Make sure we don't base our calculations on
  89                 // a parent animation state that is out of date.
  90                 m_Parent->ValidatePosition();
  91
  92                 // Parent will recursively call our validation.
  93                 ENSURE(m_PositionValid);
  94                 return;
  95         }
  96
  97         m_PositionValid = true;
  98 }
  99
 100 void CModelDecal::SetTransform(const CMatrix3D& transform)
 101 {
 102         // Since decals are assumed to be horizontal and projected downwards
 103         // onto the terrain, use just the Y-axis rotation and the translation
 104         CMatrix3D newTransform;
 105         newTransform.SetYRotation(transform.GetYRotation() + m_Decal.m_Angle);
 106         newTransform.Translate(transform.GetTranslation());
 107
 108         CRenderableObject::SetTransform(newTransform);
 109         InvalidatePosition();
 110 }
 111
 112 void CModelDecal::RemoveShadows()
 113 {
 114         m_Decal.m_Material.AddShaderDefine(str_DISABLE_RECEIVE_SHADOWS, str_1);
 115 }