movement.dm

//The minimum for glide_size to be clamped to.
#define MIN_GLIDE_SIZE 1
//The maximum for glide_size to be clamped to.
//This shouldn't be higher than the icon size, and generally you shouldn't be changing this, but it's here just in case.
#define MAX_GLIDE_SIZE 32

// Originally a really stupid /tg/ var that sucked and was really bad and caused it to look horrible. Now it's a way of compensating for time dilation
GLOBAL_VAR_INIT(glide_size_multiplier, 1.0)

///Broken down, here's what this does:
/// divides the world icon_size (32) by delay divided by ticklag to get the number of pixels something should be moving each tick.
/// The division result is given a min value of 1 to prevent obscenely slow glide sizes from being set
/// Then that's multiplied by the global glide size multiplier. 1.25 by default feels pretty close to spot on. This is just to try to get byond to behave.
/// The whole result is then clamped to within the range above.
/// Not very readable but it works
#define DELAY_TO_GLIDE_SIZE(delay) (clamp(((32 / max((delay) / world.tick_lag, 1)) * GLOB.glide_size_multiplier), MIN_GLIDE_SIZE, MAX_GLIDE_SIZE))


/**
 * currently_z_moving defines. Higher numbers mean higher priority.
 * This one is for falling down open space from stuff such as deleted tile, pit grate...
 */
#define CURRENTLY_Z_FALLING 1
/// currently_z_moving is set to this in zMove() if 0.
#define CURRENTLY_Z_MOVING_GENERIC 2
/// This one is for falling down open space from movement.
#define CURRENTLY_Z_FALLING_FROM_MOVE 3
/// This one is for going upstairs.
#define CURRENTLY_Z_ASCENDING 4

/// possible bitflag return values of [atom/proc/intercept_zImpact] calls
/// Stops the movable from falling further and crashing on the ground. Example: stairs.
#define FALL_INTERCEPTED (1<<0)
/// Suppresses the "[movable] falls through [old_turf]" message because it'd make little sense in certain contexts like climbing stairs.
#define FALL_NO_MESSAGE (1<<1)
/// Used when the whole intercept_zImpact forvar loop should be stopped. For example: when someone falls into the supermatter and becomes dust.
#define FALL_STOP_INTERCEPTING (1<<2)
/// Used when the grip on a pulled object shouldn't be broken.
#define FALL_RETAIN_PULL (1<<3)

/// Runs check_pulling() by the end of [/atom/movable/proc/zMove] for every movable that's pulling something. Should be kept enabled unless you know what you are doing.
#define ZMOVE_CHECK_PULLING (1<<0)
/// Checks if pulledby is nearby. if not, stop being pulled.
#define ZMOVE_CHECK_PULLEDBY (1<<1)
/// flags for different checks done in [/atom/movable/proc/can_z_move]. Should be self-explainatory.
#define ZMOVE_FALL_CHECKS (1<<2)
#define ZMOVE_CAN_FLY_CHECKS (1<<3)
#define ZMOVE_INCAPACITATED_CHECKS (1<<4)
/// Doesn't call zPassIn() and zPassOut()
#define ZMOVE_IGNORE_OBSTACLES (1<<5)
/// Gives players chat feedbacks if they're unable to move through z levels.
#define ZMOVE_FEEDBACK (1<<6)
/// Whether we check the movable (if it exists) the living mob is buckled on or not.
#define ZMOVE_ALLOW_BUCKLED (1<<7)
/// If the movable is actually ventcrawling vertically.
#define ZMOVE_VENTCRAWLING (1<<8)
/// Includes movables that're either pulled by the source or mobs buckled to it in the list of moving movables.
#define ZMOVE_INCLUDE_PULLED (1<<9)
/// Skips check for whether the moving atom is anchored or not.
#define ZMOVE_ALLOW_ANCHORED (1<<10)

#define ZMOVE_CHECK_PULLS (ZMOVE_CHECK_PULLING|ZMOVE_CHECK_PULLEDBY)

/// Flags used in "Move Upwards" and "Move Downwards" verbs.
#define ZMOVE_FLIGHT_FLAGS (ZMOVE_CAN_FLY_CHECKS|ZMOVE_INCAPACITATED_CHECKS|ZMOVE_CHECK_PULLS|ZMOVE_ALLOW_BUCKLED)
/// Used when walking upstairs
#define ZMOVE_STAIRS_FLAGS (ZMOVE_CHECK_PULLEDBY|ZMOVE_ALLOW_BUCKLED)
/// Used for falling down open space.
#define ZMOVE_FALL_FLAGS (ZMOVE_FALL_CHECKS|ZMOVE_ALLOW_BUCKLED)