BT411/engine/MUNGA_L4/L4PADRIO.h

#pragma once

//###########################################################################
//
// L4PADRIO -- the hardware-less cockpit device (BT_GLASS only).
//
// PadRIO synthesizes the pod's abstract control surface (RIOBase: the five
// analog Scalars + button/keypad events + lamps) from an XInput controller
// and the PC keyboard, so the whole stock RIO path above the seam -- the
// LBE4ControlsManager push, MechRIOMapper, streamed .CTL mappings, lamp
// writes -- runs with no serial hardware.  Selected at runtime with
// L4CONTROLS=PAD (the factory arm in L4CTRL.cpp).
//
// Input model (bindings: L4PADBINDINGS.h, content\bindings.txt):
//  - keyboard keys emit button/keypad edge events and drive the analog
//    channels (spring-stick deflect / throttle-lever slew / detent set)
//  - XInput pad buttons emit button events; pad axes drive the channels
//    directly (or as slew rates); hot-plug re-probe every ~3 s
//  - on-screen cockpit buttons (the L4PADPANEL window, or any WndProc)
//    inject through the static SetScreenButton() entry
//  - lamps are recorded in lampState[] for the on-screen panel to render
//
// The keyboard is only read while a window of THIS process has focus.
// L4PADFLIP=1 inverts both stick axes.
//
//###########################################################################

#include "l4rio.h"
#include "l4padbindings.h"

class PadRIO :
	public RIOBase
{
public:
	PadRIO();
	~PadRIO();

	Logical
		GetNextEvent(RIOEvent *destinationPointer);

	void
		SetLamp(int lampNumber, int state);

	Logical
		IsOperational() const
			{ return True; }

	//
	// The on-screen panel / WndProc entries.  Safe no-ops when no PadRIO
	// is active (pod build never links this TU; a glass build without
	// L4CONTROLS=PAD never constructs one).  Same-thread use only: the
	// panel WndProc runs on the app thread's message pump.
	//
	static Logical
		IsActive();
	static void
		SetScreenButton(int unit, int pressed);
	static int
		GetLampState(int unit);

	//
	// Legacy typed-channel suppression (the btinput BTInputSuppressKey
	// pattern, glass-side).  A key CLAIMED by a bindings.txt row (or by the
	// hardcoded `/V view-toggle and J/K/L preset-cycle keys) is swallowed
	// from the engine's WM_CHAR/WM_KEYUP key-command feed (L4CTRL.cpp:1506
	// block) -- otherwise every bound letter double-dispatches into the 1995
	// in-cockpit dispatcher ('w' = pilot select 0, 'a'/'s'/'d'/'f' = MFD2
	// preset pages, NUMPAD key-up VKs alias to 'b'/'d'/'e' hotkeys, ...).
	// Unbound keys keep their authentic 1995 typed meaning.  Returns 0 when
	// no PadRIO is active (the feed flows untouched on dev/pod builds).
	//
	static int
		SuppressKey(unsigned int key_value, int is_char);

	enum { LampCount = 128 };

protected:
	void
		Poll();
	void
		PushEvent(const RIOEvent &event);
	void
		EmitButton(int address, int pressed);
	void
		EmitKeypad(int unit, int key);

	PadBindingProfile
		bindings;

	//
	// Event queue (ring; drop-newest on overflow, logged).
	//
	enum { EventQueueSize = 128 };
	RIOEvent
		eventQueue[EventQueueSize];
	int
		eventHead, eventTail;

	//
	// Poll state.
	//
	unsigned long
		lastPollMilliseconds;
	unsigned long
		lastPadProbeMilliseconds;
	int
		padIndex;				// connected XInput slot, -1 = none
	unsigned
		previousPadButtons;
	unsigned char
		previousKeyHeld[192];	// per key BINDING (parallel to the profile)
	//
	// Generic-joystick edge state, per BINDING (parallel to the profile's
	// joy tables -- the previousKeyHeld pattern).  A device detach reads
	// everything as released, so held buttons let go automatically (the
	// issue-#24 rule).
	//
	unsigned char
		previousJoyButtonHeld[48];
	unsigned char
		previousJoyHatHeld[16];
	//
	// Direct-axis RELEASE EDGES (issue #36, night-2: "the mech may keep
	// turning when control is released").  A direct-mode axis write was
	// gated on raw != 0, so an axis returning INSIDE the deadzone simply
	// stopped writing -- the channel LATCHED at the last deflection (fatal
	// on channels with no keyboard spring, e.g. the Turn composite).  Track
	// the previous post-deadzone value per binding: the outside->inside
	// transition writes 0 exactly once, then leaves the channel to other
	// inputs (the composition model is preserved).
	//
	float
		previousPadAxisRaw[12];		// parallel to padAxisBindings
	float
		previousJoyAxisRaw[24];		// parallel to joyAxisBindings
	float
		channelValue[PadBindingProfile::ChannelCount];
	float
		channelReturnRate[PadBindingProfile::ChannelCount];
	int
		flipStickAxes;			// L4PADFLIP

	int
		lampState[LampCount];

	//
	// Typed-channel suppression tables (built from the loaded bindings +
	// the hardcoded view/preset keys; see SuppressKey).
	//
	unsigned char
		suppressChar[256];		// WM_CHAR values
	unsigned char
		suppressKeyUp[256];		// WM_KEYUP values (VK aliases)
	void
		AddKeySuppression(int virtual_key);
	void
		BuildKeySuppression();

	static PadRIO
		*activeInstance;

public:
	//
	// Is the desktop pad RIO the live input device?  (0 on real pod hardware,
	// whose RIO is the serial Ranger board -- see BTPadRIOActive.)
	//
	static int
		HasActiveInstance() { return activeInstance != 0; }
};