forked from 0ad/0ad
493 lines
18 KiB
C++
493 lines
18 KiB
C++
/* Copyright (C) 2015 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_ICMPOBSTRUCTIONMANAGER
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#define INCLUDED_ICMPOBSTRUCTIONMANAGER
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#include "simulation2/system/Interface.h"
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#include "simulation2/helpers/Pathfinding.h"
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#include "maths/FixedVector2D.h"
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class IObstructionTestFilter;
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/**
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* Obstruction manager: provides efficient spatial queries over objects in the world.
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*
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* The class deals with two types of shape:
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* "static" shapes, typically representing buildings, which are rectangles with a given
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* width and height and angle;
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* and "unit" shapes, representing units that can move around the world, which have a
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* radius and no rotation. (Units sometimes act as axis-aligned squares, sometimes
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* as approximately circles, due to the algorithm used by the short pathfinder.)
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*
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* Other classes (particularly ICmpObstruction) register shapes with this interface
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* and keep them updated.
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*
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* The @c Test functions provide exact collision tests.
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* The edge of a shape counts as 'inside' the shape, for the purpose of collisions.
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* The functions accept an IObstructionTestFilter argument, which can restrict the
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* set of shapes that are counted as collisions.
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*
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* Units can be marked as either moving or stationary, which simply determines whether
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* certain filters include or exclude them.
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*
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* The @c Rasterize function approximates the current set of shapes onto a 2D grid,
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* for use with tile-based pathfinding.
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*/
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class ICmpObstructionManager : public IComponent
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{
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public:
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/**
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* External identifiers for shapes.
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* (This is a struct rather than a raw u32 for type-safety.)
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*/
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struct tag_t
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{
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tag_t() : n(0) {}
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explicit tag_t(u32 n) : n(n) {}
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bool valid() { return n != 0; }
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u32 n;
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};
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/**
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* Boolean flags affecting the obstruction behaviour of a shape.
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*/
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enum EFlags
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{
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FLAG_BLOCK_MOVEMENT = (1 << 0), // prevents units moving through this shape
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FLAG_BLOCK_FOUNDATION = (1 << 1), // prevents foundations being placed on this shape
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FLAG_BLOCK_CONSTRUCTION = (1 << 2), // prevents buildings being constructed on this shape
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FLAG_BLOCK_PATHFINDING = (1 << 3), // prevents the tile pathfinder choosing paths through this shape
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FLAG_MOVING = (1 << 4) // indicates this unit is currently moving
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};
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/**
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* Bitmask of EFlag values.
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*/
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typedef u8 flags_t;
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/**
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* Set the bounds of the world.
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* Any point outside the bounds is considered obstructed.
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* @param x0,z0,x1,z1 Coordinates of the corners of the world
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*/
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virtual void SetBounds(entity_pos_t x0, entity_pos_t z0, entity_pos_t x1, entity_pos_t z1) = 0;
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/**
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* Register a static shape.
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*
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* @param ent entity ID associated with this shape (or INVALID_ENTITY if none)
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* @param x,z coordinates of center, in world space
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* @param a angle of rotation (clockwise from +Z direction)
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* @param w width (size along X axis)
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* @param h height (size along Z axis)
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* @param flags a set of EFlags values
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* @param group primary control group of the shape. Must be a valid control group ID.
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* @param group2 Optional; secondary control group of the shape. Defaults to INVALID_ENTITY.
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* @return a valid tag for manipulating the shape
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* @see StaticShape
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*/
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virtual tag_t AddStaticShape(entity_id_t ent, entity_pos_t x, entity_pos_t z, entity_angle_t a,
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entity_pos_t w, entity_pos_t h, flags_t flags, entity_id_t group, entity_id_t group2 = INVALID_ENTITY) = 0;
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/**
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* Register a unit shape.
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*
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* @param ent entity ID associated with this shape (or INVALID_ENTITY if none)
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* @param x,z coordinates of center, in world space
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* @param clearance pathfinding clearance of the unit (works as a radius)
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* @param flags a set of EFlags values
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* @param group control group (typically the owner entity, or a formation controller entity
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* - units ignore collisions with others in the same group)
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* @return a valid tag for manipulating the shape
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* @see UnitShape
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*/
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virtual tag_t AddUnitShape(entity_id_t ent, entity_pos_t x, entity_pos_t z, entity_pos_t clearance,
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flags_t flags, entity_id_t group) = 0;
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/**
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* Adjust the position and angle of an existing shape.
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* @param tag tag of shape (must be valid)
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* @param x X coordinate of center, in world space
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* @param z Z coordinate of center, in world space
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* @param a angle of rotation (clockwise from +Z direction); ignored for unit shapes
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*/
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virtual void MoveShape(tag_t tag, entity_pos_t x, entity_pos_t z, entity_angle_t a) = 0;
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/**
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* Set whether a unit shape is moving or stationary.
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* @param tag tag of shape (must be valid and a unit shape)
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* @param moving whether the unit is currently moving through the world or is stationary
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*/
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virtual void SetUnitMovingFlag(tag_t tag, bool moving) = 0;
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/**
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* Set the control group of a unit shape.
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* @param tag tag of shape (must be valid and a unit shape)
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* @param group control group entity ID
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*/
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virtual void SetUnitControlGroup(tag_t tag, entity_id_t group) = 0;
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/**
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* Sets the control group of a static shape.
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* @param tag Tag of the shape to set the control group for. Must be a valid and static shape tag.
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* @param group Control group entity ID.
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*/
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virtual void SetStaticControlGroup(tag_t tag, entity_id_t group, entity_id_t group2) = 0;
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/**
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* Remove an existing shape. The tag will be made invalid and must not be used after this.
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* @param tag tag of shape (must be valid)
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*/
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virtual void RemoveShape(tag_t tag) = 0;
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/**
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* Collision test a flat-ended thick line against the current set of shapes.
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* The line caps extend by @p r beyond the end points.
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* Only intersections going from outside to inside a shape are counted.
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* @param filter filter to restrict the shapes that are counted
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* @param x0 X coordinate of line's first point
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* @param z0 Z coordinate of line's first point
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* @param x1 X coordinate of line's second point
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* @param z1 Z coordinate of line's second point
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* @param r radius (half width) of line
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* @return true if there is a collision
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*/
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virtual bool TestLine(const IObstructionTestFilter& filter, entity_pos_t x0, entity_pos_t z0, entity_pos_t x1, entity_pos_t z1, entity_pos_t r) = 0;
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/**
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* Collision test a static square shape against the current set of shapes.
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* @param filter filter to restrict the shapes that are being tested against
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* @param x X coordinate of center
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* @param z Z coordinate of center
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* @param a angle of rotation (clockwise from +Z direction)
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* @param w width (size along X axis)
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* @param h height (size along Z axis)
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* @param out if non-NULL, all colliding shapes' entities will be added to this list
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* @return true if there is a collision
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*/
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virtual bool TestStaticShape(const IObstructionTestFilter& filter,
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entity_pos_t x, entity_pos_t z, entity_pos_t a, entity_pos_t w, entity_pos_t h,
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std::vector<entity_id_t>* out) = 0;
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/**
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* Collision test a unit shape against the current set of registered shapes, and optionally writes a list of the colliding
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* shapes' entities to an output list.
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*
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* @param filter filter to restrict the shapes that are being tested against
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* @param x X coordinate of shape's center
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* @param z Z coordinate of shape's center
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* @param clearance clearance of the shape's unit
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* @param out if non-NULL, all colliding shapes' entities will be added to this list
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*
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* @return true if there is a collision
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*/
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virtual bool TestUnitShape(const IObstructionTestFilter& filter,
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entity_pos_t x, entity_pos_t z, entity_pos_t clearance,
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std::vector<entity_id_t>* out) = 0;
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/**
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* Bit-flags for Rasterize.
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*/
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enum TileObstruction
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{
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TILE_OBSTRUCTED_PATHFINDING = (1 << 0), // set if the tile pathfinder should consider this tile blocked
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TILE_OBSTRUCTED_FOUNDATION = (1 << 1), // set if the AI foundation placement algorithm should consider this tile blocked
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TILE_OUTOFBOUNDS = (1 << 2) // set if this tile is outside the world boundaries
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};
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/**
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* Convert the current set of shapes onto a navcell grid, for all passability classes contained in @p passClasses.
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* If @p fullUpdate is false, the function will only go through dirty shapes.
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* Shapes are expanded by the @p passClasses clearances, by ORing their masks onto the @p grid.
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*/
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virtual void Rasterize(Grid<u16>& grid, const std::vector<PathfinderPassability>& passClasses, bool fullUpdate) = 0;
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/**
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* Gets dirtiness information and resets it afterwards. Then it's the role of CCmpPathfinder
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* to pass the information to other components if needed. (AIs, etc.)
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* The return value is false if an update is unnecessary.
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*/
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virtual void UpdateInformations(GridUpdateInformation& informations) = 0;
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/**
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* Standard representation for all types of shapes, for use with geometry processing code.
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*/
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struct ObstructionSquare
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{
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entity_pos_t x, z; // position of center
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CFixedVector2D u, v; // 'horizontal' and 'vertical' orthogonal unit vectors, representing orientation
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entity_pos_t hw, hh; // half width, half height of square
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};
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/**
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* Find all the obstructions that are inside (or partially inside) the given range.
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* @param filter filter to restrict the shapes that are counted
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* @param x0 X coordinate of left edge of range
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* @param z0 Z coordinate of bottom edge of range
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* @param x1 X coordinate of right edge of range
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* @param z1 Z coordinate of top edge of range
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* @param squares output list of obstructions
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*/
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virtual void GetObstructionsInRange(const IObstructionTestFilter& filter, entity_pos_t x0, entity_pos_t z0, entity_pos_t x1, entity_pos_t z1, std::vector<ObstructionSquare>& squares) = 0;
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/**
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* Returns the entity IDs of all unit shapes that intersect the given
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* obstruction square, filtering out using the given filter.
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*/
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virtual void GetUnitsOnObstruction(const ObstructionSquare& square, std::vector<entity_id_t>& out, const IObstructionTestFilter& filter) = 0;
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/**
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* Get the obstruction square representing the given shape.
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* @param tag tag of shape (must be valid)
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*/
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virtual ObstructionSquare GetObstruction(tag_t tag) = 0;
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virtual ObstructionSquare GetUnitShapeObstruction(entity_pos_t x, entity_pos_t z, entity_pos_t clearance) = 0;
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virtual ObstructionSquare GetStaticShapeObstruction(entity_pos_t x, entity_pos_t z, entity_angle_t a, entity_pos_t w, entity_pos_t h) = 0;
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/**
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* Set the passability to be restricted to a circular map.
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*/
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virtual void SetPassabilityCircular(bool enabled) = 0;
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virtual bool GetPassabilityCircular() const = 0;
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/**
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* Toggle the rendering of debug info.
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*/
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virtual void SetDebugOverlay(bool enabled) = 0;
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DECLARE_INTERFACE_TYPE(ObstructionManager)
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};
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/**
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* Interface for ICmpObstructionManager @c Test functions to filter out unwanted shapes.
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*/
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class IObstructionTestFilter
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{
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public:
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typedef ICmpObstructionManager::tag_t tag_t;
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typedef ICmpObstructionManager::flags_t flags_t;
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virtual ~IObstructionTestFilter() {}
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/**
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* Return true if the shape with the specified parameters should be tested for collisions.
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* This is called for all shapes that would collide, and also for some that wouldn't.
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*
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* @param tag tag of shape being tested
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* @param flags set of EFlags for the shape
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* @param group the control group of the shape (typically the shape's unit, or the unit's formation controller, or 0)
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* @param group2 an optional secondary control group of the shape, or INVALID_ENTITY if none specified. Currently
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* exists only for static shapes.
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*/
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virtual bool TestShape(tag_t tag, flags_t flags, entity_id_t group, entity_id_t group2) const = 0;
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};
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/**
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* Obstruction test filter that will test against all shapes.
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*/
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class NullObstructionFilter : public IObstructionTestFilter
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{
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public:
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virtual bool TestShape(tag_t UNUSED(tag), flags_t UNUSED(flags), entity_id_t UNUSED(group), entity_id_t UNUSED(group2)) const
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{
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return true;
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}
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};
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/**
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* Obstruction test filter that will test only against stationary (i.e. non-moving) shapes.
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*/
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class StationaryOnlyObstructionFilter : public IObstructionTestFilter
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{
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public:
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virtual bool TestShape(tag_t UNUSED(tag), flags_t flags, entity_id_t UNUSED(group), entity_id_t UNUSED(group2)) const
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{
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return !(flags & ICmpObstructionManager::FLAG_MOVING);
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}
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};
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/**
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* Obstruction test filter that reject shapes in a given control group,
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* and rejects shapes that don't block unit movement, and optionally rejects moving shapes.
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*/
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class ControlGroupMovementObstructionFilter : public IObstructionTestFilter
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{
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bool m_AvoidMoving;
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entity_id_t m_Group;
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public:
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ControlGroupMovementObstructionFilter(bool avoidMoving, entity_id_t group) :
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m_AvoidMoving(avoidMoving), m_Group(group)
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{}
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virtual bool TestShape(tag_t UNUSED(tag), flags_t flags, entity_id_t group, entity_id_t group2) const
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{
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if (group == m_Group || (group2 != INVALID_ENTITY && group2 == m_Group))
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return false;
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if (!(flags & ICmpObstructionManager::FLAG_BLOCK_MOVEMENT))
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return false;
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if ((flags & ICmpObstructionManager::FLAG_MOVING) && !m_AvoidMoving)
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return false;
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return true;
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}
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};
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/**
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* Obstruction test filter that will test only against shapes that:
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* - are part of neither one of the specified control groups
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* - AND, depending on the value of the 'exclude' argument:
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* - have at least one of the specified flags set.
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* - OR have none of the specified flags set.
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*
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* The first (primary) control group to reject shapes from must be specified and valid. The secondary
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* control group to reject entities from may be set to INVALID_ENTITY to not use it.
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*
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* This filter is useful to e.g. allow foundations within the same control group to be placed and
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* constructed arbitrarily close together (e.g. for wall pieces that need to link up tightly).
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*/
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class SkipControlGroupsRequireFlagObstructionFilter : public IObstructionTestFilter
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{
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bool m_Exclude;
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entity_id_t m_Group;
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entity_id_t m_Group2;
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flags_t m_Mask;
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public:
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SkipControlGroupsRequireFlagObstructionFilter(bool exclude, entity_id_t group1, entity_id_t group2, flags_t mask) :
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m_Exclude(exclude), m_Group(group1), m_Group2(group2), m_Mask(mask)
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{
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Init();
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}
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SkipControlGroupsRequireFlagObstructionFilter(entity_id_t group1, entity_id_t group2, flags_t mask) :
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m_Exclude(false), m_Group(group1), m_Group2(group2), m_Mask(mask)
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{
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Init();
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}
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virtual bool TestShape(tag_t UNUSED(tag), flags_t flags, entity_id_t group, entity_id_t group2) const
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{
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// Don't test shapes that share one or more of our control groups.
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if (group == m_Group || group == m_Group2 || (group2 != INVALID_ENTITY &&
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(group2 == m_Group || group2 == m_Group2)))
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return false;
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// If m_Exclude is true, don't test against shapes that have any of the
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// obstruction flags specified in m_Mask.
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if (m_Exclude)
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return (flags & m_Mask) == 0;
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// Otherwise, only include shapes that match at least one flag in m_Mask.
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return (flags & m_Mask) != 0;
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}
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private:
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void Init()
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{
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// the primary control group to filter out must be valid
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ENSURE(m_Group != INVALID_ENTITY);
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// for simplicity, if m_Group2 is INVALID_ENTITY (i.e. not used), then set it equal to m_Group
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// so that we have fewer special cases to consider in TestShape().
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if (m_Group2 == INVALID_ENTITY)
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m_Group2 = m_Group;
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}
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};
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/**
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* Obstruction test filter that will test only against shapes that:
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* - are part of both of the specified control groups
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* - AND have at least one of the specified flags set.
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*
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* The first (primary) control group to include shapes from must be specified and valid.
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*
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* This filter is useful for preventing entities with identical control groups
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* from colliding e.g. building a new wall segment on top of an existing wall)
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*
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* @todo This filter needs test cases.
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*/
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class SkipTagRequireControlGroupsAndFlagObstructionFilter : public IObstructionTestFilter
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{
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tag_t m_Tag;
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entity_id_t m_Group;
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entity_id_t m_Group2;
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flags_t m_Mask;
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public:
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SkipTagRequireControlGroupsAndFlagObstructionFilter(tag_t tag, entity_id_t group1, entity_id_t group2, flags_t mask) :
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m_Tag(tag), m_Group(group1), m_Group2(group2), m_Mask(mask)
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{
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ENSURE(m_Group != INVALID_ENTITY);
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}
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virtual bool TestShape(tag_t tag, flags_t flags, entity_id_t group, entity_id_t group2) const
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{
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// To be included in testing, a shape must not have the specified tag, and must
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// match at least one of the flags in m_Mask, as well as both control groups.
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return (tag.n != m_Tag.n && (flags & m_Mask) != 0 && ((group == m_Group
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&& group2 == m_Group2) || (group2 == m_Group && group == m_Group2)));
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}
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};
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/**
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* Obstruction test filter that will test only against shapes that do not have the specified tag set.
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*/
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class SkipTagObstructionFilter : public IObstructionTestFilter
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{
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tag_t m_Tag;
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public:
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SkipTagObstructionFilter(tag_t tag) : m_Tag(tag)
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{
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}
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virtual bool TestShape(tag_t tag, flags_t UNUSED(flags), entity_id_t UNUSED(group), entity_id_t UNUSED(group2)) const
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{
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return tag.n != m_Tag.n;
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}
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};
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/**
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* Obstruction test filter that will test only against shapes that:
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* - do not have the specified tag
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* - AND have at least one of the specified flags set.
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*/
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class SkipTagRequireFlagsObstructionFilter : public IObstructionTestFilter
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{
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tag_t m_Tag;
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flags_t m_Mask;
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public:
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SkipTagRequireFlagsObstructionFilter(tag_t tag, flags_t mask) : m_Tag(tag), m_Mask(mask)
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|
{
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|
}
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|
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virtual bool TestShape(tag_t tag, flags_t flags, entity_id_t UNUSED(group), entity_id_t UNUSED(group2)) const
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|
{
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return (tag.n != m_Tag.n && (flags & m_Mask) != 0);
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|
}
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|
};
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|
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#endif // INCLUDED_ICMPOBSTRUCTIONMANAGER
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