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PageUp and PageDown are the volume knob

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The cabinets had no volume control - they ran at unity and left level to an
external amplifier - so a player without that hardware had nowhere to turn
it down but environ.ini and a restart. PageUp and PageDown now step the
master volume by 0.05 while you play, from silent to double, and whatever
you leave it on is written to volume.cfg beside the exe and used from then
on. The environ.ini figure decides where a machine that has never been
touched starts out; the keys are the knob, and a knob stays where it was
left.

Page keys because they produce no typed character, so they cannot collide
with the character-keyed commands the engine already answers to, nothing
else in RP binds them, and they are on every keyboard including tenkeyless.

They are polled rather than read off the key-message path, which is worth
recording because the message path looked like the obvious home for them
and was tried first. RP's keyboard pump only takes WM_KEYUP, WM_SYSKEYUP
and WM_CHAR off the front of the queue, and the front end runs message
loops of its own, so key messages get raced for and lost: six deliberate,
well-spaced presses arrived as two. Fine for the abort chord, useless for
something you tap repeatedly to find a level. Reading key state directly
costs nothing and cannot be dropped. That losses figure is a pre-existing
property of the input path, not something this change introduced, and is
worth knowing before anything else gets bound there.

Builds clean, runs, and does not fire unprompted. The step function itself
is proven - it was driven end to end through the message path before the
switch, stepping the right way, clamping, and persisting. What I could not
test from here is the polling trigger, because Windows would not hand the
game foreground and injecting keys without it would have sprayed them
across whatever else was open.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-08-06 00:00:36 -05:00
co-authored by Claude Opus 5
parent 523f713a30
commit 4e8392fcfb
6 changed files with 176 additions and 5 deletions
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MUNGA_L4/L4CTRL.cpp
+56
View File
@@ -6,6 +6,7 @@
#include "l4ctrl.h"
#include "l4keybd.h"
#include "l4app.h"
#include "l4audrnd.h" // RPAudioMasterVolumeStep, for the PgUp/PgDn keys
#include "l4dinput.h"
#include "..\munga\appmgr.h"
#include "dxutils.h"
@@ -1513,6 +1514,61 @@ void
// Update the PC keyboard mapping group
//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
// Master volume, PgUp louder / PgDn quieter.
//
// The cabinets ran the game at unity and left level to an external
// amplifier and crossover; without that hardware the player has to be able
// to reach the volume while playing.
//
// POLLED, not taken off the key message below, and that is deliberate. The
// pump below only ever consumes WM_KEYUP / WM_SYSKEYUP / WM_CHAR from the
// front of the queue, and the front-end runs message loops of its own, so
// key messages are raced for and routinely lost -- measured here at roughly
// two of every six presses arriving. That is survivable for a one-shot like
// the abort chord; it is not survivable for a control you tap repeatedly to
// find a level. Reading the key state directly costs nothing and cannot be
// dropped.
//
// Page keys because they produce no typed character, so they cannot collide
// with the character-keyed commands the pump feeds, nothing else in RP binds
// them, and they exist on tenkeyless keyboards.
//
// The foreground check keeps an alt-tabbed game from eating the volume keys
// of whatever the player switched to.
//-------------------------------------------------------------------------
//
{
static int volume_up_held = 0;
static int volume_down_held = 0;
int focused = 0;
if (HWND foreground = GetForegroundWindow())
{
DWORD foreground_process = 0;
GetWindowThreadProcessId(foreground, &foreground_process);
focused = (foreground_process == GetCurrentProcessId());
}
const int up = focused && (GetAsyncKeyState(VK_PRIOR) & 0x8000) != 0;
const int down = focused && (GetAsyncKeyState(VK_NEXT) & 0x8000) != 0;
if (up && !volume_up_held)
{
RPAudioMasterVolumeStep(+1);
}
if (down && !volume_down_held)
{
RPAudioMasterVolumeStep(-1);
}
volume_up_held = up;
volume_down_held = down;
}
if (flags.keyboardExists)
{
//RB 1/20/07