source/graphics/Decal.cpp

   1 /* Copyright (C) 2023 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 std::unique_ptr<CModelAbstract> CModelDecal::Clone() const
  27 {
  28         return std::make_unique<CModelDecal>(m_Terrain, m_Decal);
  29 }
  30
  31 void CModelDecal::CalcVertexExtents(ssize_t& i0, ssize_t& j0, ssize_t& i1, ssize_t& j1)
  32 {
  33         CVector3D corner0(m_Decal.m_OffsetX + m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ + m_Decal.m_SizeZ/2);
  34         CVector3D corner1(m_Decal.m_OffsetX + m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ - m_Decal.m_SizeZ/2);
  35         CVector3D corner2(m_Decal.m_OffsetX - m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ - m_Decal.m_SizeZ/2);
  36         CVector3D corner3(m_Decal.m_OffsetX - m_Decal.m_SizeX/2, 0, m_Decal.m_OffsetZ + m_Decal.m_SizeZ/2);
  37
  38         corner0 = GetTransform().Transform(corner0);
  39         corner1 = GetTransform().Transform(corner1);
  40         corner2 = GetTransform().Transform(corner2);
  41         corner3 = GetTransform().Transform(corner3);
  42
  43         i0 = floor(std::min(std::min(corner0.X, corner1.X), std::min(corner2.X, corner3.X)) / TERRAIN_TILE_SIZE);
  44         j0 = floor(std::min(std::min(corner0.Z, corner1.Z), std::min(corner2.Z, corner3.Z)) / TERRAIN_TILE_SIZE);
  45         i1 = ceil(std::max(std::max(corner0.X, corner1.X), std::max(corner2.X, corner3.X)) / TERRAIN_TILE_SIZE);
  46         j1 = ceil(std::max(std::max(corner0.Z, corner1.Z), std::max(corner2.Z, corner3.Z)) / TERRAIN_TILE_SIZE);
  47
  48         i0 = Clamp<ssize_t>(i0, 0, m_Terrain->GetVerticesPerSide() - 1);
  49         j0 = Clamp<ssize_t>(j0, 0, m_Terrain->GetVerticesPerSide() - 1);
  50         i1 = Clamp<ssize_t>(i1, 0, m_Terrain->GetVerticesPerSide() - 1);
  51         j1 = Clamp<ssize_t>(j1, 0, m_Terrain->GetVerticesPerSide() - 1);
  52 }
  53
  54 void CModelDecal::CalcBounds()
  55 {
  56         ssize_t i0, j0, i1, j1;
  57         CalcVertexExtents(i0, j0, i1, j1);
  58         m_WorldBounds = m_Terrain->GetVertexesBound(i0, j0, i1, j1);
  59 }
  60
  61 void CModelDecal::SetTerrainDirty(ssize_t i0, ssize_t j0, ssize_t i1, ssize_t j1)
  62 {
  63         // Check if there's no intersection between the dirty range and this decal
  64         ssize_t bi0, bj0, bi1, bj1;
  65         CalcVertexExtents(bi0, bj0, bi1, bj1);
  66         if (bi1 < i0 || bi0 > i1 || bj1 < j0 || bj0 > j1)
  67                 return;
  68
  69         SetDirty(RENDERDATA_UPDATE_VERTICES);
  70 }
  71
  72 void CModelDecal::InvalidatePosition()
  73 {
  74         m_PositionValid = false;
  75 }
  76
  77 void CModelDecal::ValidatePosition()
  78 {
  79         if (m_PositionValid)
  80         {
  81                 ENSURE(!m_Parent || m_Parent->m_PositionValid);
  82                 return;
  83         }
  84
  85         if (m_Parent && !m_Parent->m_PositionValid)
  86         {
  87                 // Make sure we don't base our calculations on
  88                 // a parent animation state that is out of date.
  89                 m_Parent->ValidatePosition();
  90
  91                 // Parent will recursively call our validation.
  92                 ENSURE(m_PositionValid);
  93                 return;
  94         }
  95
  96         m_PositionValid = true;
  97 }
  98
  99 void CModelDecal::SetTransform(const CMatrix3D& transform)
 100 {
 101         // Since decals are assumed to be horizontal and projected downwards
 102         // onto the terrain, use just the Y-axis rotation and the translation
 103         CMatrix3D newTransform;
 104         newTransform.SetYRotation(transform.GetYRotation() + m_Decal.m_Angle);
 105         newTransform.Translate(transform.GetTranslation());
 106
 107         CRenderableObject::SetTransform(newTransform);
 108         InvalidatePosition();
 109 }
 110
 111 void CModelDecal::RemoveShadows()
 112 {
 113         m_Decal.m_Material.AddShaderDefine(str_DISABLE_RECEIVE_SHADOWS, str_1);
 114 }