2010-03-18 00:01:12 +01:00
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/* Copyright (C) 2010 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/Grid.h"
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#include "simulation2/helpers/Position.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 exposes the abstraction of "shapes", which represent circles or squares
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* with certain properties.
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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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* The @c Rasterise function approximates the current set of shapes onto a 2D grid,
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* primarily for 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. Valid tags are guaranteed to be non-zero.
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*/
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typedef u32 tag_t;
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/**
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* Register a circle.
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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 r radius
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* @return a valid tag for manipulating the shape
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*/
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virtual tag_t AddCircle(entity_pos_t x, entity_pos_t z, entity_pos_t r) = 0;
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/**
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* Register a square.
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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)
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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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* @return a valid tag for manipulating the shape
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*/
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virtual tag_t AddSquare(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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* 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 circles
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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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* 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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* @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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2010-04-19 21:47:23 +02:00
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* @return false if there is a collision
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2010-03-18 00:01:12 +01:00
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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 circle against the current set of shapes.
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* @param filter filter to restrict the shapes that are counted
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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 r radius of circle
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2010-04-19 21:47:23 +02:00
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* @return false if there is a collision
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2010-03-18 00:01:12 +01:00
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*/
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virtual bool TestCircle(const IObstructionTestFilter& filter, entity_pos_t x, entity_pos_t z, entity_pos_t r) = 0;
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/**
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* Collision test a square against the current set of shapes.
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* @param filter filter to restrict the shapes that are counted
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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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2010-04-19 21:47:23 +02:00
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* @return false if there is a collision
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2010-03-18 00:01:12 +01:00
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*/
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virtual bool TestSquare(const IObstructionTestFilter& filter, entity_pos_t x, entity_pos_t z, entity_pos_t a, entity_pos_t w, entity_pos_t h) = 0;
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/**
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* Convert the current set of shapes onto a grid.
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* Tiles that are partially or completely intersected by a shape will be set to 1;
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* others will be set to 0.
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* This is very cheap if the grid has been rasterised before and the set of shapes has not changed.
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* @param grid the grid to be updated
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* @return true if any changes were made to the grid, false if it was already up-to-date
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*/
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virtual bool Rasterise(Grid<u8>& grid) = 0;
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2010-03-20 20:18:01 +01:00
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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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2010-03-18 00:01:12 +01:00
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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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virtual ~IObstructionTestFilter() {}
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/**
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* Return true if the shape should be counted 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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* @param tag tag of shape being tested
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*/
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virtual bool Allowed(ICmpObstructionManager::tag_t tag) const = 0;
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};
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/**
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* Obstruction test filter that accepts 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 Allowed(ICmpObstructionManager::tag_t UNUSED(tag)) const { return true; }
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};
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/**
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* Obstruction test filter that rejects a specific shape.
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*/
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class SkipTagObstructionFilter : public IObstructionTestFilter
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{
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ICmpObstructionManager::tag_t m_Tag;
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public:
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SkipTagObstructionFilter(ICmpObstructionManager::tag_t tag) : m_Tag(tag) {}
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virtual bool Allowed(ICmpObstructionManager::tag_t tag) const { return tag != m_Tag; }
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};
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#endif // INCLUDED_ICMPOBSTRUCTIONMANAGER
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