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157c6af18e
Avoid cases of filenames Update years in terms and other legal(ish) documents Don't update years in license headers, since change is not meaningful Will add linter rule in seperate commit Happy recompiling everyone! Original Patch By: Nescio Comment By: Gallaecio Differential Revision: D2620 This was SVN commit r27786.
128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
/* Copyright (C) 2020 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_LOS
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#define INCLUDED_LOS
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// It doesn't seem worth moving the implementation to c++ and early-declaring Grid
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// since files must include "Los.h" explicitly, and that's only done in .cpp files.
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#include "Grid.h"
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/**
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* Computing LOS data at a very high resolution is not necessary and quite slow.
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* This is the size, in meters, separating each LOS vertex.
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* (Note that this also means it is the minimal meaningful resolution of any vision range change).
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*/
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static constexpr i32 LOS_TILE_SIZE = 4;
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enum class LosState : u8
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{
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UNEXPLORED = 0,
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EXPLORED = 1,
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VISIBLE = 2,
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MASK = 3
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};
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/**
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* Object providing efficient abstracted access to the LOS state.
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* This depends on some implementation details of CCmpRangeManager.
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*
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* This *ignores* the GetLosRevealAll flag - callers should check that explicitly.
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*/
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class CLosQuerier
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{
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private:
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friend class CCmpRangeManager;
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friend class TestLOSTexture;
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CLosQuerier(u32 playerMask, const Grid<u32>& data, ssize_t verticesPerSide) :
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m_Data(data), m_PlayerMask(playerMask), m_VerticesPerSide(verticesPerSide)
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{
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}
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const CLosQuerier& operator=(const CLosQuerier&); // not implemented
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public:
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/**
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* Returns whether the given vertex is visible (i.e. is within a unit's LOS).
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*/
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inline bool IsVisible(ssize_t i, ssize_t j) const
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{
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if (!(i >= 0 && j >= 0 && i < m_VerticesPerSide && j < m_VerticesPerSide))
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return false;
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// Check high bit of each bit-pair
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if ((m_Data.get(i, j) & m_PlayerMask) & 0xAAAAAAAAu)
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return true;
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else
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return false;
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}
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/**
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* Returns whether the given vertex is explored (i.e. was (or still is) within a unit's LOS).
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*/
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inline bool IsExplored(ssize_t i, ssize_t j) const
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{
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if (!(i >= 0 && j >= 0 && i < m_VerticesPerSide && j < m_VerticesPerSide))
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return false;
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// Check low bit of each bit-pair
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if ((m_Data.get(i, j) & m_PlayerMask) & 0x55555555u)
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return true;
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else
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return false;
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}
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/**
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* Returns whether the given vertex is visible (i.e. is within a unit's LOS).
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* i and j must be in the range [0, verticesPerSide), else behaviour is undefined.
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*/
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inline bool IsVisible_UncheckedRange(ssize_t i, ssize_t j) const
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{
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#ifndef NDEBUG
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ENSURE(i >= 0 && j >= 0 && i < m_VerticesPerSide && j < m_VerticesPerSide);
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#endif
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// Check high bit of each bit-pair
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if ((m_Data.get(i, j) & m_PlayerMask) & 0xAAAAAAAAu)
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return true;
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else
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return false;
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}
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/**
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* Returns whether the given vertex is explored (i.e. was (or still is) within a unit's LOS).
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* i and j must be in the range [0, verticesPerSide), else behaviour is undefined.
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*/
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inline bool IsExplored_UncheckedRange(ssize_t i, ssize_t j) const
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{
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#ifndef NDEBUG
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ENSURE(i >= 0 && j >= 0 && i < m_VerticesPerSide && j < m_VerticesPerSide);
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#endif
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// Check low bit of each bit-pair
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if ((m_Data.get(i, j) & m_PlayerMask) & 0x55555555u)
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return true;
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else
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return false;
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}
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private:
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u32 m_PlayerMask;
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const Grid<u32>& m_Data;
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ssize_t m_VerticesPerSide;
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};
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#endif // INCLUDED_LOS
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