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types.go
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types.go
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/*
* FrankyGo - UCI chess engine in GO for learning purposes
*
* MIT License
*
* Copyright (c) 2018-2020 Frank Kopp
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// Package types contains various user defined data types and their corresponding
// functionality we need for the chess engine.
// Many of these would be perfect enum candidates but GO does not provide enums
package types
var initialized = false
// Init initializes pre computed data structures e.g. bitboards, etc.
// Keeps an initialized flag to avoid multiple executions.
func init() {
if initialized {
return
}
// bitboards
initBb()
// pos values
initPosValues()
initialized = true
}
const (
// SqLength number of squares on a board
SqLength int = 64
// MaxDepth max search depth
MaxDepth = 128
// MaxMoves max number of moves for a game
MaxMoves = 512
// KB = 1.024 bytes
KB uint64 = 1024
// MB = KB * KB
MB uint64 = KB * KB
// GB = KB * MB
GB uint64 = KB * MB
// GamePhaseMax maximum game phase value. Game phase is used to
// determine if we are in the beginning or end phase of a chess game
// Game phase is calculated be the number of officers on the board
// with this maximum
GamePhaseMax = 24
)