62 lines
1.6 KiB
MySQL
62 lines
1.6 KiB
MySQL
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-- LegacyWorlds Beta 6
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-- PostgreSQL database scripts
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--
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-- Resource providers functions
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--
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-- Copyright(C) 2004-2012, DeepClone Development
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-- --------------------------------------------------------
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/*
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* Compute resource provider regeneration
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*
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* This function computes the quantity in a resource provider after it has
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* been regenerated.
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*
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* Parameters:
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* _quantity The current quantity of resources in the provider
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* _max The maximal amount of resources supported by the
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* provider
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* _recovery_rate The provider's recovery rate
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*
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* Returns:
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* ? The new quantity of resources.
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*/
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CREATE OR REPLACE FUNCTION verse.compute_provider_regeneration(
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_quantity DOUBLE PRECISION ,
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_max DOUBLE PRECISION ,
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_recovery_rate DOUBLE PRECISION )
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RETURNS DOUBLE PRECISION
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STRICT IMMUTABLE
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SECURITY INVOKER
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AS $compute_provider_regeneration$
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DECLARE
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_uc_recovery DOUBLE PRECISION;
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_uc_dampening DOUBLE PRECISION;
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_uc_ticks DOUBLE PRECISION;
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_result DOUBLE PRECISION;
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BEGIN
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_uc_recovery := sys.get_constant( 'game.resources.recovery' );
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_uc_dampening := sys.get_constant( 'game.resources.recoveryDampening' );
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_uc_ticks := 1440; -- FIXME: this should be a constant
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_result := ( 1 - _quantity / _max ) ^ _uc_dampening;
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_result := _quantity + _result * _recovery_rate * _uc_recovery / _uc_ticks;
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IF _result > _max THEN
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_result := _max;
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END IF;
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RETURN _result;
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END;
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$compute_provider_regeneration$ LANGUAGE PLPGSQL;
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REVOKE EXECUTE
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ON FUNCTION verse.compute_provider_regeneration(
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DOUBLE PRECISION , DOUBLE PRECISION ,
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DOUBLE PRECISION )
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FROM PUBLIC;
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