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Ilia Sharin 21751c0025 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

2026-04-23 12:17:35 -04:00

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← Home · Intuition

IDCMP — IntuiMessage Classes

Overview

IDCMP (Intuition Direct Communication Message Ports) is the mechanism by which Intuition delivers input events to windows. Each window has a UserPort (MsgPort) where IntuiMessage structures are queued.

struct IntuiMessage

/* intuition/intuition.h — NDK39 */
struct IntuiMessage {
    struct Message   ExecMessage;
    ULONG            Class;        /* IDCMP_* class */
    UWORD            Code;         /* class-specific code */
    UWORD            Qualifier;    /* key/mouse qualifiers */
    APTR             IAddress;     /* class-specific address (e.g. gadget) */
    WORD             MouseX;       /* mouse X relative to window */
    WORD             MouseY;       /* mouse Y relative to window */
    ULONG            Seconds;      /* timestamp seconds */
    ULONG            Micros;       /* timestamp microseconds */
    struct Window   *IDCMPWindow;  /* window that received this */
    struct IntuiMessage *SpecialLink;
};

IDCMP Class Constants

Constant	Hex	Description
`IDCMP_SIZEVERIFY`	`$0001`	Window is about to be resized
`IDCMP_NEWSIZE`	`$0002`	Window was resized
`IDCMP_REFRESHWINDOW`	`$0004`	Window needs refresh
`IDCMP_MOUSEBUTTONS`	`$0008`	Mouse button pressed/released
`IDCMP_MOUSEMOVE`	`$0010`	Mouse moved (if REPORTMOUSE)
`IDCMP_GADGETDOWN`	`$0020`	Gadget pressed
`IDCMP_GADGETUP`	`$0040`	Gadget released
`IDCMP_REQSET`	`$0080`	Requester activated
`IDCMP_MENUPICK`	`$0100`	Menu item selected
`IDCMP_CLOSEWINDOW`	`$0200`	Close gadget clicked
`IDCMP_RAWKEY`	`$0400`	Raw keyboard event
`IDCMP_REQVERIFY`	`$0800`	Requester about to open
`IDCMP_REQCLEAR`	`$1000`	Requester closed
`IDCMP_MENUVERIFY`	`$2000`	Menu about to open
`IDCMP_NEWPREFS`	`$4000`	Preferences changed
`IDCMP_DISKINSERTED`	`$8000`	Disk inserted
`IDCMP_DISKREMOVED`	`$10000`	Disk removed
`IDCMP_ACTIVEWINDOW`	`$40000`	Window activated
`IDCMP_INACTIVEWINDOW`	`$80000`	Window deactivated
`IDCMP_DELTAMOVE`	`$100000`	Delta mouse movement
`IDCMP_VANILLAKEY`	`$200000`	Translated ASCII keypress
`IDCMP_INTUITICKS`	`$400000`	~10Hz timer tick
`IDCMP_IDCMPUPDATE`	`$800000`	BOOPSI gadget update
`IDCMP_CHANGEWINDOW`	`$2000000`	Window moved/resized

Qualifier Flags

Constant	Hex	Description
`IEQUALIFIER_LSHIFT`	`$0001`	Left Shift
`IEQUALIFIER_RSHIFT`	`$0002`	Right Shift
`IEQUALIFIER_CAPSLOCK`	`$0004`	Caps Lock
`IEQUALIFIER_CONTROL`	`$0008`	Control
`IEQUALIFIER_LALT`	`$0010`	Left Alt
`IEQUALIFIER_RALT`	`$0020`	Right Alt
`IEQUALIFIER_LCOMMAND`	`$0040`	Left Amiga
`IEQUALIFIER_RCOMMAND`	`$0080`	Right Amiga
`IEQUALIFIER_LEFTBUTTON`	`$4000`	LMB
`IEQUALIFIER_MIDBUTTON`	`$1000`	MMB
`IEQUALIFIER_RBUTTON`	`$8000`	RMB (not standard)

References

NDK39: intuition/intuition.h, devices/inputevent.h
ADCD 2.1: IDCMP reference

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