arcattackandClaude Opus 4.8
0ca7d269d2
New L4AUDEFX bridge (OpenAL Soft ALC_EXT_EFX): one EAXReverb aux slot at the authentic AUDIO.INI global_reverb_scale (0.3) + a scratch AL_FILTER_LOWPASS (params copied at attach). F9 filters (was: computed then thrown away -- everything full-bright at all distances): Dynamic3D ExecuteModel drives GAINHF from highFreqCutoffScale x brightnessScale x maxMIDIFilterCutoff, UNGATED (decomp part_008.c:7496, 7589-7604 -- every moving 3D sound dulls with distance per the AUDIO.INI knee-60/exp-2.0 model); Static3D from brightness x max (:7831-7884); Direct inside its existing gated NRPN-rate block. AWE 100-8000 Hz curve -> EFX 5 kHz-reference gainhf via a 2-pole approximation [T3 curve, endpoints exact]. F11 reverb (was: bone-dry everywhere): 3D patch sources attach an aux send at Start, exactly where the original sent CC91 = global_reverb_scale (part_008.c:7278-7394); Direct cockpit sources keep CC91=0 -- dry. The wet-exterior vs dry-cockpit contrast is back. F12 placement (was: every cockpit sound dead-center): DirectPatchSource Start places sources by the authored 6-value position enum (front/rear card + pan CC10, decomp @00463848/@004638a8) as listener-relative directions, composed with the zone L/C/R pan. New PatchResource GetBankID/GetPatchID pass-throughs (the LOD accessor is protected). Regression (35s drive+fire): EFX READY, stable, deliveries unregressed, no AL errors. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
45 lines
1.9 KiB
C
45 lines
1.9 KiB
C
#pragma once
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//###########################################################################
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//
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// L4AUDEFX.h -- OpenAL EFX bridge for the authored filter/reverb chains
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// (task #50, AUDIO_FIDELITY F9/F11).
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//
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// The original drove the AWE32 initial-filter-cutoff NRPN per frame
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// (brightness x distance HF rolloff) and sent CC91 reverb on the 3D
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// channels (global_reverb_scale=0.3, AUDIO.INI) while keeping the cockpit
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// Direct channels dry. This bridge reproduces both through OpenAL Soft's
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// EFX extension: one EAXReverb aux slot + a scratch AL_FILTER_LOWPASS
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// whose parameters are copied at attach time.
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//
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//###########################################################################
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#include "openal/al.h"
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// Load the EFX entry points, create the reverb slot (gain = the authentic
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// global_reverb_scale) and the scratch lowpass. Call once, with the AL
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// context current. Returns false (and stays inert) without ALC_EXT_EFX.
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bool EFX_Initialize(float global_reverb_scale);
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bool EFX_Available();
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// Per-frame direct-path lowpass: gainhf is the linear HF gain at the EFX
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// 5 kHz reference. Callers map the AWE cutoff (100 + scale*7900/127 Hz)
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// through EFX_CutoffScaleToGainHF below.
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void EFX_SetSourceLowpassGainHF(ALuint source, float gainhf);
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// AWE NRPN 21 curve -> EFX gainhf: cutoff_scale in [0,1] of the 100-8000 Hz
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// span; approximated as the attenuation of a 2-pole lowpass at the 5 kHz
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// reference [T3 -- curve shape approximate, endpoints exact].
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inline float EFX_CutoffScaleToGainHF(float cutoff_scale)
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{
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if (cutoff_scale < 0.0f) cutoff_scale = 0.0f;
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if (cutoff_scale > 1.0f) cutoff_scale = 1.0f;
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float cutoff_hz = 100.0f + cutoff_scale * 7900.0f;
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float g = (cutoff_hz / 5000.0f) * (cutoff_hz / 5000.0f);
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return (g > 1.0f) ? 1.0f : ((g < 0.001f) ? 0.001f : g);
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}
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// Wet-exterior routing: attach the source's aux send to the reverb slot
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// (Dynamic3D/Static3D). Direct cockpit sources stay dry by default.
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void EFX_AttachReverbSend(ALuint source);
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