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From 962ee8fc46ca51691bde1c8c1022dacbe8a037ed Mon Sep 17 00:00:00 2001
From: Carl Reinke <carlreinke@users.noreply.github.com>
Date: Sun, 14 Jun 2020 14:11:00 -0600
Subject: [PATCH] Move definitions that don't need to be exposed from opl.h to
opl.c
[Retrieved from:
https://github.com/opentyrian/opentyrian/commit/962ee8fc46ca51691bde1c8c1022dacbe8a037ed]
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
src/opl.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++++++-
src/opl.h | 157 ++----------------------------------------------------
2 files changed, 154 insertions(+), 156 deletions(-)
diff --git a/src/opl.c b/src/opl.c
index a4071c5..f15474c 100644
--- a/src/opl.c
+++ b/src/opl.c
@@ -23,12 +23,161 @@
* Copyright (C) 1998-2001 Ken Silverman
* Ken Silverman's official web site: "http://www.advsys.net/ken"
*/
-
+#include "opl.h"
#include <math.h>
+#include <stdbool.h>
#include <stdlib.h> // rand()
#include <string.h> // memset()
-#include "opl.h"
+
+#define fltype double
+
+ /*
+ define attribution that inlines/forces inlining of a function (optional)
+ */
+#define OPL_INLINE inline
+
+
+#undef NUM_CHANNELS
+#if defined(OPLTYPE_IS_OPL3)
+#define NUM_CHANNELS 18
+#else
+#define NUM_CHANNELS 9
+#endif
+
+#define MAXOPERATORS (NUM_CHANNELS*2)
+
+
+#define FL05 ((fltype)0.5)
+#define FL2 ((fltype)2.0)
+#define PI ((fltype)3.1415926535897932384626433832795)
+
+
+#define FIXEDPT 0x10000 // fixed-point calculations using 16+16
+#define FIXEDPT_LFO 0x1000000 // fixed-point calculations using 8+24
+
+#define WAVEPREC 1024 // waveform precision (10 bits)
+
+#define INTFREQU ((fltype)(14318180.0 / 288.0)) // clocking of the chip
+
+
+#define OF_TYPE_ATT 0
+#define OF_TYPE_DEC 1
+#define OF_TYPE_REL 2
+#define OF_TYPE_SUS 3
+#define OF_TYPE_SUS_NOKEEP 4
+#define OF_TYPE_OFF 5
+
+#define ARC_CONTROL 0x00
+#define ARC_TVS_KSR_MUL 0x20
+#define ARC_KSL_OUTLEV 0x40
+#define ARC_ATTR_DECR 0x60
+#define ARC_SUSL_RELR 0x80
+#define ARC_FREQ_NUM 0xa0
+#define ARC_KON_BNUM 0xb0
+#define ARC_PERC_MODE 0xbd
+#define ARC_FEEDBACK 0xc0
+#define ARC_WAVE_SEL 0xe0
+
+#define ARC_SECONDSET 0x100 // second operator set for OPL3
+
+
+#define OP_ACT_OFF 0x00
+#define OP_ACT_NORMAL 0x01 // regular channel activated (bitmasked)
+#define OP_ACT_PERC 0x02 // percussion channel activated (bitmasked)
+
+#define BLOCKBUF_SIZE 512
+
+
+ // vibrato constants
+#define VIBTAB_SIZE 8
+#define VIBFAC 70/50000 // no braces, integer mul/div
+
+ // tremolo constants and table
+#define TREMTAB_SIZE 53
+#define TREM_FREQ ((fltype)(3.7)) // tremolo at 3.7hz
+
+
+ /* operator struct definition
+ For OPL2 all 9 channels consist of two operators each, carrier and modulator.
+ Channel x has operators x as modulator and operators (9+x) as carrier.
+ For OPL3 all 18 channels consist either of two operators (2op mode) or four
+ operators (4op mode) which is determined through register4 of the second
+ adlib register set.
+ Only the channels 0,1,2 (first set) and 9,10,11 (second set) can act as
+ 4op channels. The two additional operators for a channel y come from the
+ 2op channel y+3 so the operatorss y, (9+y), y+3, (9+y)+3 make up a 4op
+ channel.
+ */
+typedef struct operator_struct {
+ Bit32s cval, lastcval; // current output/last output (used for feedback)
+ Bit32u tcount, wfpos, tinc; // time (position in waveform) and time increment
+ fltype amp, step_amp; // and amplification (envelope)
+ fltype vol; // volume
+ fltype sustain_level; // sustain level
+ Bit32s mfbi; // feedback amount
+ fltype a0, a1, a2, a3; // attack rate function coefficients
+ fltype decaymul, releasemul; // decay/release rate functions
+ Bit32u op_state; // current state of operator (attack/decay/sustain/release/off)
+ Bit32u toff;
+ Bit32s freq_high; // highest three bits of the frequency, used for vibrato calculations
+ Bit16s* cur_wform; // start of selected waveform
+ Bit32u cur_wmask; // mask for selected waveform
+ Bit32u act_state; // activity state (regular, percussion)
+ bool sus_keep; // keep sustain level when decay finished
+ bool vibrato,tremolo; // vibrato/tremolo enable bits
+
+ // variables used to provide non-continuous envelopes
+ Bit32u generator_pos; // for non-standard sample rates we need to determine how many samples have passed
+ Bits cur_env_step; // current (standardized) sample position
+ Bits env_step_a,env_step_d,env_step_r; // number of std samples of one step (for attack/decay/release mode)
+ Bit8u step_skip_pos_a; // position of 8-cyclic step skipping (always 2^x to check against mask)
+ Bits env_step_skip_a; // bitmask that determines if a step is skipped (respective bit is zero then)
+
+#if defined(OPLTYPE_IS_OPL3)
+ bool is_4op,is_4op_attached; // base of a 4op channel/part of a 4op channel
+ Bit32s left_pan,right_pan; // opl3 stereo panning amount
+#endif
+} op_type;
+
+// per-chip variables
+static op_type op[MAXOPERATORS];
+
+static Bits int_samplerate;
+
+static Bit8u status;
+static Bit32u opl_index;
+#if defined(OPLTYPE_IS_OPL3)
+static Bit8u adlibreg[512]; // adlib register set (including second set)
+static Bit8u wave_sel[44]; // waveform selection
+#else
+static Bit8u adlibreg[256]; // adlib register set
+static Bit8u wave_sel[22]; // waveform selection
+#endif
+
+
+ // vibrato/tremolo increment/counter
+static Bit32u vibtab_pos;
+static Bit32u vibtab_add;
+static Bit32u tremtab_pos;
+static Bit32u tremtab_add;
+
+
+// enable an operator
+void enable_operator(Bitu regbase, op_type* op_pt, Bit32u act_type);
+
+// functions to change parameters of an operator
+void change_frequency(Bitu chanbase, Bitu regbase, op_type* op_pt);
+
+void change_attackrate(Bitu regbase, op_type* op_pt);
+void change_decayrate(Bitu regbase, op_type* op_pt);
+void change_releaserate(Bitu regbase, op_type* op_pt);
+void change_sustainlevel(Bitu regbase, op_type* op_pt);
+void change_waveform(Bitu regbase, op_type* op_pt);
+void change_keepsustain(Bitu regbase, op_type* op_pt);
+void change_vibrato(Bitu regbase, op_type* op_pt);
+void change_feedback(Bitu chanbase, op_type* op_pt);
+
static Bit32u generator_add; // should be a chip parameter
diff --git a/src/opl.h b/src/opl.h
index c8e643b..cbb56ad 100644
--- a/src/opl.h
+++ b/src/opl.h
@@ -25,11 +25,8 @@
* Ken Silverman's official web site: "http://www.advsys.net/ken"
*/
-
-#define fltype double
-
-#include <stdbool.h>
#include <stdint.h>
+
typedef uintptr_t Bitu;
typedef intptr_t Bits;
typedef uint32_t Bit32u;
@@ -39,154 +36,6 @@ typedef int16_t Bit16s;
typedef uint8_t Bit8u;
typedef int8_t Bit8s;
-
-/*
- define attribution that inlines/forces inlining of a function (optional)
-*/
-#define OPL_INLINE inline
-
-
-#undef NUM_CHANNELS
-#if defined(OPLTYPE_IS_OPL3)
-#define NUM_CHANNELS 18
-#else
-#define NUM_CHANNELS 9
-#endif
-
-#define MAXOPERATORS (NUM_CHANNELS*2)
-
-
-#define FL05 ((fltype)0.5)
-#define FL2 ((fltype)2.0)
-#define PI ((fltype)3.1415926535897932384626433832795)
-
-
-#define FIXEDPT 0x10000 // fixed-point calculations using 16+16
-#define FIXEDPT_LFO 0x1000000 // fixed-point calculations using 8+24
-
-#define WAVEPREC 1024 // waveform precision (10 bits)
-
-#define INTFREQU ((fltype)(14318180.0 / 288.0)) // clocking of the chip
-
-
-#define OF_TYPE_ATT 0
-#define OF_TYPE_DEC 1
-#define OF_TYPE_REL 2
-#define OF_TYPE_SUS 3
-#define OF_TYPE_SUS_NOKEEP 4
-#define OF_TYPE_OFF 5
-
-#define ARC_CONTROL 0x00
-#define ARC_TVS_KSR_MUL 0x20
-#define ARC_KSL_OUTLEV 0x40
-#define ARC_ATTR_DECR 0x60
-#define ARC_SUSL_RELR 0x80
-#define ARC_FREQ_NUM 0xa0
-#define ARC_KON_BNUM 0xb0
-#define ARC_PERC_MODE 0xbd
-#define ARC_FEEDBACK 0xc0
-#define ARC_WAVE_SEL 0xe0
-
-#define ARC_SECONDSET 0x100 // second operator set for OPL3
-
-
-#define OP_ACT_OFF 0x00
-#define OP_ACT_NORMAL 0x01 // regular channel activated (bitmasked)
-#define OP_ACT_PERC 0x02 // percussion channel activated (bitmasked)
-
-#define BLOCKBUF_SIZE 512
-
-
-// vibrato constants
-#define VIBTAB_SIZE 8
-#define VIBFAC 70/50000 // no braces, integer mul/div
-
-// tremolo constants and table
-#define TREMTAB_SIZE 53
-#define TREM_FREQ ((fltype)(3.7)) // tremolo at 3.7hz
-
-
-/* operator struct definition
- For OPL2 all 9 channels consist of two operators each, carrier and modulator.
- Channel x has operators x as modulator and operators (9+x) as carrier.
- For OPL3 all 18 channels consist either of two operators (2op mode) or four
- operators (4op mode) which is determined through register4 of the second
- adlib register set.
- Only the channels 0,1,2 (first set) and 9,10,11 (second set) can act as
- 4op channels. The two additional operators for a channel y come from the
- 2op channel y+3 so the operatorss y, (9+y), y+3, (9+y)+3 make up a 4op
- channel.
-*/
-typedef struct operator_struct {
- Bit32s cval, lastcval; // current output/last output (used for feedback)
- Bit32u tcount, wfpos, tinc; // time (position in waveform) and time increment
- fltype amp, step_amp; // and amplification (envelope)
- fltype vol; // volume
- fltype sustain_level; // sustain level
- Bit32s mfbi; // feedback amount
- fltype a0, a1, a2, a3; // attack rate function coefficients
- fltype decaymul, releasemul; // decay/release rate functions
- Bit32u op_state; // current state of operator (attack/decay/sustain/release/off)
- Bit32u toff;
- Bit32s freq_high; // highest three bits of the frequency, used for vibrato calculations
- Bit16s* cur_wform; // start of selected waveform
- Bit32u cur_wmask; // mask for selected waveform
- Bit32u act_state; // activity state (regular, percussion)
- bool sus_keep; // keep sustain level when decay finished
- bool vibrato,tremolo; // vibrato/tremolo enable bits
-
- // variables used to provide non-continuous envelopes
- Bit32u generator_pos; // for non-standard sample rates we need to determine how many samples have passed
- Bits cur_env_step; // current (standardized) sample position
- Bits env_step_a,env_step_d,env_step_r; // number of std samples of one step (for attack/decay/release mode)
- Bit8u step_skip_pos_a; // position of 8-cyclic step skipping (always 2^x to check against mask)
- Bits env_step_skip_a; // bitmask that determines if a step is skipped (respective bit is zero then)
-
-#if defined(OPLTYPE_IS_OPL3)
- bool is_4op,is_4op_attached; // base of a 4op channel/part of a 4op channel
- Bit32s left_pan,right_pan; // opl3 stereo panning amount
-#endif
-} op_type;
-
-// per-chip variables
-Bitu chip_num;
-op_type op[MAXOPERATORS];
-
-Bits int_samplerate;
-
-Bit8u status;
-Bit32u opl_index;
-#if defined(OPLTYPE_IS_OPL3)
-Bit8u adlibreg[512]; // adlib register set (including second set)
-Bit8u wave_sel[44]; // waveform selection
-#else
-Bit8u adlibreg[256]; // adlib register set
-Bit8u wave_sel[22]; // waveform selection
-#endif
-
-
-// vibrato/tremolo increment/counter
-Bit32u vibtab_pos;
-Bit32u vibtab_add;
-Bit32u tremtab_pos;
-Bit32u tremtab_add;
-
-
-// enable an operator
-void enable_operator(Bitu regbase, op_type* op_pt, Bit32u act_type);
-
-// functions to change parameters of an operator
-void change_frequency(Bitu chanbase, Bitu regbase, op_type* op_pt);
-
-void change_attackrate(Bitu regbase, op_type* op_pt);
-void change_decayrate(Bitu regbase, op_type* op_pt);
-void change_releaserate(Bitu regbase, op_type* op_pt);
-void change_sustainlevel(Bitu regbase, op_type* op_pt);
-void change_waveform(Bitu regbase, op_type* op_pt);
-void change_keepsustain(Bitu regbase, op_type* op_pt);
-void change_vibrato(Bitu regbase, op_type* op_pt);
-void change_feedback(Bitu chanbase, op_type* op_pt);
-
// general functions
void adlib_init(Bit32u samplerate);
void adlib_write(Bitu idx, Bit8u val);
@@ -195,8 +44,8 @@ void adlib_getsample(Bit16s* sndptr, Bits numsamples);
Bitu adlib_reg_read(Bitu port);
void adlib_write_index(Bitu port, Bit8u val);
-#endif /* OPL_H */
-
#define opl_init() adlib_init(OUTPUT_QUALITY * 11025)
#define opl_write(reg, val) adlib_write(reg, val)
#define opl_update(buf, num) adlib_getsample(buf, num)
+
+#endif /* OPL_H */
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