shithub: choc

Download patch

ref: db8ead81f0c099d1a3c1b5463c9a220712b1168b
parent: 4a3c8c6d7eedf2f9e4d960bf9c121f4902f73a27
author: nukeykt <alexeytf2@icloud.com>
date: Thu Mar 22 15:56:13 EDT 2018 

opl: Nuked OPL3 v1.8


--- a/opl/opl3.c
+++ b/opl/opl3.c
@@ -1,5 +1,5 @@
 //
-// Copyright (C) 2013-2016 Alexey Khokholov (Nuke.YKT)
+// Copyright (C) 2013-2018 Alexey Khokholov (Nuke.YKT)
 //
 // This program is free software; you can redistribute it and/or
 // modify it under the terms of the GNU General Public License
@@ -20,8 +20,10 @@
 //          Tremolo and phase generator calculation information.
 //      OPLx decapsulated(Matthew Gambrell, Olli Niemitalo):
 //          OPL2 ROMs.
+//      siliconpr0n.org(John McMaster, digshadow):
+//          YMF262 and VRC VII decaps and die shots.
 //
-// version: 1.7.4
+// version: 1.8
 //
 
 #include <stdio.h>
@@ -92,38 +94,38 @@
 //
 
 static const Bit16u exprom[256] = {
-    0x000, 0x003, 0x006, 0x008, 0x00b, 0x00e, 0x011, 0x014,
-    0x016, 0x019, 0x01c, 0x01f, 0x022, 0x025, 0x028, 0x02a,
-    0x02d, 0x030, 0x033, 0x036, 0x039, 0x03c, 0x03f, 0x042,
-    0x045, 0x048, 0x04b, 0x04e, 0x051, 0x054, 0x057, 0x05a,
-    0x05d, 0x060, 0x063, 0x066, 0x069, 0x06c, 0x06f, 0x072,
-    0x075, 0x078, 0x07b, 0x07e, 0x082, 0x085, 0x088, 0x08b,
-    0x08e, 0x091, 0x094, 0x098, 0x09b, 0x09e, 0x0a1, 0x0a4,
-    0x0a8, 0x0ab, 0x0ae, 0x0b1, 0x0b5, 0x0b8, 0x0bb, 0x0be,
-    0x0c2, 0x0c5, 0x0c8, 0x0cc, 0x0cf, 0x0d2, 0x0d6, 0x0d9,
-    0x0dc, 0x0e0, 0x0e3, 0x0e7, 0x0ea, 0x0ed, 0x0f1, 0x0f4,
-    0x0f8, 0x0fb, 0x0ff, 0x102, 0x106, 0x109, 0x10c, 0x110,
-    0x114, 0x117, 0x11b, 0x11e, 0x122, 0x125, 0x129, 0x12c,
-    0x130, 0x134, 0x137, 0x13b, 0x13e, 0x142, 0x146, 0x149,
-    0x14d, 0x151, 0x154, 0x158, 0x15c, 0x160, 0x163, 0x167,
-    0x16b, 0x16f, 0x172, 0x176, 0x17a, 0x17e, 0x181, 0x185,
-    0x189, 0x18d, 0x191, 0x195, 0x199, 0x19c, 0x1a0, 0x1a4,
-    0x1a8, 0x1ac, 0x1b0, 0x1b4, 0x1b8, 0x1bc, 0x1c0, 0x1c4,
-    0x1c8, 0x1cc, 0x1d0, 0x1d4, 0x1d8, 0x1dc, 0x1e0, 0x1e4,
-    0x1e8, 0x1ec, 0x1f0, 0x1f5, 0x1f9, 0x1fd, 0x201, 0x205,
-    0x209, 0x20e, 0x212, 0x216, 0x21a, 0x21e, 0x223, 0x227,
-    0x22b, 0x230, 0x234, 0x238, 0x23c, 0x241, 0x245, 0x249,
-    0x24e, 0x252, 0x257, 0x25b, 0x25f, 0x264, 0x268, 0x26d,
-    0x271, 0x276, 0x27a, 0x27f, 0x283, 0x288, 0x28c, 0x291,
-    0x295, 0x29a, 0x29e, 0x2a3, 0x2a8, 0x2ac, 0x2b1, 0x2b5,
-    0x2ba, 0x2bf, 0x2c4, 0x2c8, 0x2cd, 0x2d2, 0x2d6, 0x2db,
-    0x2e0, 0x2e5, 0x2e9, 0x2ee, 0x2f3, 0x2f8, 0x2fd, 0x302,
-    0x306, 0x30b, 0x310, 0x315, 0x31a, 0x31f, 0x324, 0x329,
-    0x32e, 0x333, 0x338, 0x33d, 0x342, 0x347, 0x34c, 0x351,
-    0x356, 0x35b, 0x360, 0x365, 0x36a, 0x370, 0x375, 0x37a,
-    0x37f, 0x384, 0x38a, 0x38f, 0x394, 0x399, 0x39f, 0x3a4,
-    0x3a9, 0x3ae, 0x3b4, 0x3b9, 0x3bf, 0x3c4, 0x3c9, 0x3cf,
-    0x3d4, 0x3da, 0x3df, 0x3e4, 0x3ea, 0x3ef, 0x3f5, 0x3fa
+    0x7fa, 0x7f5, 0x7ef, 0x7ea, 0x7e4, 0x7df, 0x7da, 0x7d4,
+    0x7cf, 0x7c9, 0x7c4, 0x7bf, 0x7b9, 0x7b4, 0x7ae, 0x7a9,
+    0x7a4, 0x79f, 0x799, 0x794, 0x78f, 0x78a, 0x784, 0x77f,
+    0x77a, 0x775, 0x770, 0x76a, 0x765, 0x760, 0x75b, 0x756,
+    0x751, 0x74c, 0x747, 0x742, 0x73d, 0x738, 0x733, 0x72e,
+    0x729, 0x724, 0x71f, 0x71a, 0x715, 0x710, 0x70b, 0x706,
+    0x702, 0x6fd, 0x6f8, 0x6f3, 0x6ee, 0x6e9, 0x6e5, 0x6e0,
+    0x6db, 0x6d6, 0x6d2, 0x6cd, 0x6c8, 0x6c4, 0x6bf, 0x6ba,
+    0x6b5, 0x6b1, 0x6ac, 0x6a8, 0x6a3, 0x69e, 0x69a, 0x695,
+    0x691, 0x68c, 0x688, 0x683, 0x67f, 0x67a, 0x676, 0x671,
+    0x66d, 0x668, 0x664, 0x65f, 0x65b, 0x657, 0x652, 0x64e,
+    0x649, 0x645, 0x641, 0x63c, 0x638, 0x634, 0x630, 0x62b,
+    0x627, 0x623, 0x61e, 0x61a, 0x616, 0x612, 0x60e, 0x609,
+    0x605, 0x601, 0x5fd, 0x5f9, 0x5f5, 0x5f0, 0x5ec, 0x5e8,
+    0x5e4, 0x5e0, 0x5dc, 0x5d8, 0x5d4, 0x5d0, 0x5cc, 0x5c8,
+    0x5c4, 0x5c0, 0x5bc, 0x5b8, 0x5b4, 0x5b0, 0x5ac, 0x5a8,
+    0x5a4, 0x5a0, 0x59c, 0x599, 0x595, 0x591, 0x58d, 0x589,
+    0x585, 0x581, 0x57e, 0x57a, 0x576, 0x572, 0x56f, 0x56b,
+    0x567, 0x563, 0x560, 0x55c, 0x558, 0x554, 0x551, 0x54d,
+    0x549, 0x546, 0x542, 0x53e, 0x53b, 0x537, 0x534, 0x530,
+    0x52c, 0x529, 0x525, 0x522, 0x51e, 0x51b, 0x517, 0x514,
+    0x510, 0x50c, 0x509, 0x506, 0x502, 0x4ff, 0x4fb, 0x4f8,
+    0x4f4, 0x4f1, 0x4ed, 0x4ea, 0x4e7, 0x4e3, 0x4e0, 0x4dc,
+    0x4d9, 0x4d6, 0x4d2, 0x4cf, 0x4cc, 0x4c8, 0x4c5, 0x4c2,
+    0x4be, 0x4bb, 0x4b8, 0x4b5, 0x4b1, 0x4ae, 0x4ab, 0x4a8,
+    0x4a4, 0x4a1, 0x49e, 0x49b, 0x498, 0x494, 0x491, 0x48e,
+    0x48b, 0x488, 0x485, 0x482, 0x47e, 0x47b, 0x478, 0x475,
+    0x472, 0x46f, 0x46c, 0x469, 0x466, 0x463, 0x460, 0x45d,
+    0x45a, 0x457, 0x454, 0x451, 0x44e, 0x44b, 0x448, 0x445,
+    0x442, 0x43f, 0x43c, 0x439, 0x436, 0x433, 0x430, 0x42d,
+    0x42a, 0x428, 0x425, 0x422, 0x41f, 0x41c, 0x419, 0x416,
+    0x414, 0x411, 0x40e, 0x40b, 0x408, 0x406, 0x403, 0x400
 };
 
 //
@@ -152,35 +154,13 @@
 // envelope generator constants
 //
 
-static const Bit8u eg_incstep[3][4][8] = {
-    {
-        { 0, 0, 0, 0, 0, 0, 0, 0 },
-        { 0, 0, 0, 0, 0, 0, 0, 0 },
-        { 0, 0, 0, 0, 0, 0, 0, 0 },
-        { 0, 0, 0, 0, 0, 0, 0, 0 }
-    },
-    {
-        { 0, 1, 0, 1, 0, 1, 0, 1 },
-        { 0, 1, 0, 1, 1, 1, 0, 1 },
-        { 0, 1, 1, 1, 0, 1, 1, 1 },
-        { 0, 1, 1, 1, 1, 1, 1, 1 }
-    },
-    {
-        { 1, 1, 1, 1, 1, 1, 1, 1 },
-        { 2, 2, 1, 1, 1, 1, 1, 1 },
-        { 2, 2, 1, 1, 2, 2, 1, 1 },
-        { 2, 2, 2, 2, 2, 2, 1, 1 }
-    }
+static const Bit8u eg_incstep[4][4] = {
+    { 0, 0, 0, 0 },
+    { 1, 0, 0, 0 },
+    { 1, 0, 1, 0 },
+    { 1, 1, 1, 0 }
 };
 
-static const Bit8u eg_incdesc[16] = {
-    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2
-};
-
-static const Bit8s eg_incsh[16] = {
-    0, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, -1, -2
-};
-
 //
 // address decoding
 //
@@ -207,7 +187,7 @@
     {
         level = 0x1fff;
     }
-    return ((exprom[(level & 0xff) ^ 0xff] | 0x400) << 1) >> (level >> 8);
+    return (exprom[level & 0xff] << 1) >> (level >> 8);
 }
 
 static Bit16s OPL3_EnvelopeCalcSin0(Bit16u phase, Bit16u envelope)
@@ -217,7 +197,7 @@
     phase &= 0x3ff;
     if (phase & 0x200)
     {
-        neg = ~0;
+        neg = 0xffff;
     }
     if (phase & 0x100)
     {
@@ -286,7 +266,7 @@
     phase &= 0x3ff;
     if ((phase & 0x300) == 0x100)
     {
-        neg = ~0;
+        neg = 0xffff;
     }
     if (phase & 0x200)
     {
@@ -328,7 +308,7 @@
     phase &= 0x3ff;
     if (phase & 0x200)
     {
-        neg = ~0;
+        neg = 0xffff;
     }
     return OPL3_EnvelopeCalcExp(envelope << 3) ^ neg;
 }
@@ -340,7 +320,7 @@
     phase &= 0x3ff;
     if (phase & 0x200)
     {
-        neg = ~0;
+        neg = 0xffff;
         phase = (phase & 0x1ff) ^ 0x1ff;
     }
     out = phase << 3;
@@ -358,45 +338,14 @@
     OPL3_EnvelopeCalcSin7
 };
 
-static void OPL3_EnvelopeGenOff(opl3_slot *slot);
-static void OPL3_EnvelopeGenAttack(opl3_slot *slot);
-static void OPL3_EnvelopeGenDecay(opl3_slot *slot);
-static void OPL3_EnvelopeGenSustain(opl3_slot *slot);
-static void OPL3_EnvelopeGenRelease(opl3_slot *slot);
-
-envelope_genfunc envelope_gen[5] = {
-    OPL3_EnvelopeGenOff,
-    OPL3_EnvelopeGenAttack,
-    OPL3_EnvelopeGenDecay,
-    OPL3_EnvelopeGenSustain,
-    OPL3_EnvelopeGenRelease
-};
-
 enum envelope_gen_num
 {
-    envelope_gen_num_off = 0,
-    envelope_gen_num_attack = 1,
-    envelope_gen_num_decay = 2,
-    envelope_gen_num_sustain = 3,
-    envelope_gen_num_release = 4
+    envelope_gen_num_attack = 0,
+    envelope_gen_num_decay = 1,
+    envelope_gen_num_sustain = 2,
+    envelope_gen_num_release = 3
 };
 
-static Bit8u OPL3_EnvelopeCalcRate(opl3_slot *slot, Bit8u reg_rate)
-{
-    Bit8u rate;
-    if (reg_rate == 0x00)
-    {
-        return 0x00;
-    }
-    rate = (reg_rate << 2)
-         + (slot->reg_ksr ? slot->channel->ksv : (slot->channel->ksv >> 2));
-    if (rate > 0x3c)
-    {
-        rate = 0x3c;
-    }
-    return rate;
-}
-
 static void OPL3_EnvelopeUpdateKSL(opl3_slot *slot)
 {
     Bit16s ksl = (kslrom[slot->channel->f_num >> 6] << 2)
@@ -408,128 +357,161 @@
     slot->eg_ksl = (Bit8u)ksl;
 }
 
-static void OPL3_EnvelopeUpdateRate(opl3_slot *slot)
+static void OPL3_EnvelopeCalc(opl3_slot *slot)
 {
-    switch (slot->eg_gen)
+    Bit8u nonzero;
+    Bit8u rate;
+    Bit8u rate_hi;
+    Bit8u rate_lo;
+    Bit8u reg_rate = 0;
+    Bit8u ks;
+    Bit8u eg_shift, shift;
+    Bit16u eg_rout;
+    Bit16s eg_inc;
+    Bit8u eg_off;
+    Bit8u reset = 0;
+    slot->eg_out = slot->eg_rout + (slot->reg_tl << 2)
+                 + (slot->eg_ksl >> kslshift[slot->reg_ksl]) + *slot->trem;
+    if (slot->key && slot->eg_gen == envelope_gen_num_release)
     {
-    case envelope_gen_num_off:
-    case envelope_gen_num_attack:
-        slot->eg_rate = OPL3_EnvelopeCalcRate(slot, slot->reg_ar);
-        break;
-    case envelope_gen_num_decay:
-        slot->eg_rate = OPL3_EnvelopeCalcRate(slot, slot->reg_dr);
-        break;
-    case envelope_gen_num_sustain:
-    case envelope_gen_num_release:
-        slot->eg_rate = OPL3_EnvelopeCalcRate(slot, slot->reg_rr);
-        break;
+        reset = 1;
+        reg_rate = slot->reg_ar;
     }
-}
-
-static void OPL3_EnvelopeGenOff(opl3_slot *slot)
-{
-    slot->eg_rout = 0x1ff;
-}
-
-static void OPL3_EnvelopeGenAttack(opl3_slot *slot)
-{
-    if (slot->eg_rout == 0x00)
+    else
     {
-        slot->eg_gen = envelope_gen_num_decay;
-        OPL3_EnvelopeUpdateRate(slot);
-        return;
+        switch (slot->eg_gen)
+        {
+        case envelope_gen_num_attack:
+            reg_rate = slot->reg_ar;
+            break;
+        case envelope_gen_num_decay:
+            reg_rate = slot->reg_dr;
+            break;
+        case envelope_gen_num_sustain:
+            if (!slot->reg_type)
+            {
+                reg_rate = slot->reg_rr;
+            }
+            break;
+        case envelope_gen_num_release:
+            reg_rate = slot->reg_rr;
+            break;
+        }
     }
-    slot->eg_rout += ((~slot->eg_rout) * slot->eg_inc) >> 3;
-    if (slot->eg_rout < 0x00)
+    slot->pg_reset = reset;
+    ks = slot->channel->ksv >> ((slot->reg_ksr ^ 1) << 1);
+    nonzero = (reg_rate != 0);
+    rate = ks + (reg_rate << 2);
+    rate_hi = rate >> 2;
+    rate_lo = rate & 0x03;
+    if (rate_hi & 0x10)
     {
-        slot->eg_rout = 0x00;
+        rate_hi = 0x0f;
     }
-}
-
-static void OPL3_EnvelopeGenDecay(opl3_slot *slot)
-{
-    if (slot->eg_rout >= slot->reg_sl << 4)
+    eg_shift = rate_hi + slot->chip->eg_add;
+    shift = 0;
+    if (nonzero)
+    {
+        if (rate_hi < 12)
+        {
+            if (slot->chip->eg_state)
+            {
+                switch (eg_shift)
+                {
+                case 12:
+                    shift = 1;
+                    break;
+                case 13:
+                    shift = (rate_lo >> 1) & 0x01;
+                    break;
+                case 14:
+                    shift = rate_lo & 0x01;
+                    break;
+                default:
+                    break;
+                }
+            }
+        }
+        else
+        {
+            shift = (rate_hi & 0x03) + eg_incstep[rate_lo][slot->chip->timer & 0x03];
+            if (shift & 0x04)
+            {
+                shift = 0x03;
+            }
+            if (!shift)
+            {
+                shift = slot->chip->eg_state;
+            }
+        }
+    }
+    eg_rout = slot->eg_rout;
+    eg_inc = 0;
+    eg_off = 0;
+    // Instant attack
+    if (reset && rate_hi == 0x0f)
     {
-        slot->eg_gen = envelope_gen_num_sustain;
-        OPL3_EnvelopeUpdateRate(slot);
-        return;
+        eg_rout = 0x00;
     }
-    slot->eg_rout += slot->eg_inc;
-}
-
-static void OPL3_EnvelopeGenSustain(opl3_slot *slot)
-{
-    if (!slot->reg_type)
+    // Envelope off
+    if ((slot->eg_rout & 0x1f8) == 0x1f8)
     {
-        OPL3_EnvelopeGenRelease(slot);
+        eg_off = 1;
     }
-}
-
-static void OPL3_EnvelopeGenRelease(opl3_slot *slot)
-{
-    if (slot->eg_rout >= 0x1ff)
+    if (slot->eg_gen != envelope_gen_num_attack && !reset && eg_off)
     {
-        slot->eg_gen = envelope_gen_num_off;
-        slot->eg_rout = 0x1ff;
-        OPL3_EnvelopeUpdateRate(slot);
-        return;
+        eg_rout = 0x1ff;
     }
-    slot->eg_rout += slot->eg_inc;
-}
-
-static void OPL3_EnvelopeCalc(opl3_slot *slot)
-{
-    Bit8u rate_h, rate_l;
-    Bit8u inc = 0;
-    rate_h = slot->eg_rate >> 2;
-    rate_l = slot->eg_rate & 3;
-    if (eg_incsh[rate_h] > 0)
+    switch (slot->eg_gen)
     {
-        if ((slot->chip->timer & ((1 << eg_incsh[rate_h]) - 1)) == 0)
+    case envelope_gen_num_attack:
+        if (!slot->eg_rout)
         {
-            inc = eg_incstep[eg_incdesc[rate_h]][rate_l]
-                            [((slot->chip->timer)>> eg_incsh[rate_h]) & 0x07];
+            slot->eg_gen = envelope_gen_num_decay;
         }
+        else if (slot->key && shift > 0 && rate_hi != 0x0f)
+        {
+            eg_inc = ((~slot->eg_rout) << shift) >> 4;
+        }
+        break;
+    case envelope_gen_num_decay:
+        if ((slot->eg_rout >> 4) == slot->reg_sl)
+        {
+            slot->eg_gen = envelope_gen_num_sustain;
+        }
+        else if (!eg_off && !reset && shift > 0)
+        {
+            eg_inc = 1 << (shift - 1);
+        }
+        break;
+    case envelope_gen_num_sustain:
+    case envelope_gen_num_release:
+        if (!eg_off && !reset && shift > 0)
+        {
+            eg_inc = 1 << (shift - 1);
+        }
+        break;
     }
-    else
+    slot->eg_rout = (eg_rout + eg_inc) & 0x1ff;
+    // Key off
+    if (reset)
     {
-        inc = eg_incstep[eg_incdesc[rate_h]][rate_l]
-                        [slot->chip->timer & 0x07] << (-eg_incsh[rate_h]);
+        slot->eg_gen = envelope_gen_num_attack;
     }
-    slot->eg_inc = inc;
-    slot->eg_out = slot->eg_rout + (slot->reg_tl << 2)
-                 + (slot->eg_ksl >> kslshift[slot->reg_ksl]) + *slot->trem;
-    envelope_gen[slot->eg_gen](slot);
+    if (!slot->key)
+    {
+        slot->eg_gen = envelope_gen_num_release;
+    }
 }
 
 static void OPL3_EnvelopeKeyOn(opl3_slot *slot, Bit8u type)
 {
-    if (!slot->key)
-    {
-        slot->eg_gen = envelope_gen_num_attack;
-        OPL3_EnvelopeUpdateRate(slot);
-        if ((slot->eg_rate >> 2) == 0x0f)
-        {
-            slot->eg_gen = envelope_gen_num_decay;
-            OPL3_EnvelopeUpdateRate(slot);
-            slot->eg_rout = 0x00;
-        }
-        slot->pg_phase = 0x00;
-    }
     slot->key |= type;
 }
 
 static void OPL3_EnvelopeKeyOff(opl3_slot *slot, Bit8u type)
 {
-    if (slot->key)
-    {
-        slot->key &= (~type);
-        if (!slot->key)
-        {
-            slot->eg_gen = envelope_gen_num_release;
-            OPL3_EnvelopeUpdateRate(slot);
-        }
-    }
+    slot->key &= ~type;
 }
 
 //
@@ -538,9 +520,14 @@
 
 static void OPL3_PhaseGenerate(opl3_slot *slot)
 {
+    opl3_chip *chip;
     Bit16u f_num;
     Bit32u basefreq;
+    Bit8u rm_xor, n_bit;
+    Bit32u noise;
+    Bit16u phase;
 
+    chip = slot->chip;
     f_num = slot->channel->f_num;
     if (slot->reg_vib)
     {
@@ -567,20 +554,58 @@
         f_num += range;
     }
     basefreq = (f_num << slot->channel->block) >> 1;
+    phase = (Bit16u)(slot->pg_phase >> 9);
+    if (slot->pg_reset)
+    {
+        slot->pg_phase = 0;
+    }
     slot->pg_phase += (basefreq * mt[slot->reg_mult]) >> 1;
-}
-
-//
-// Noise Generator
-//
-
-static void OPL3_NoiseGenerate(opl3_chip *chip)
-{
-    if (chip->noise & 0x01)
+    // Rhythm mode
+    noise = chip->noise;
+    slot->pg_phase_out = phase;
+    if (slot->slot_num == 13) // hh
+    {
+        chip->rm_hh_bit2 = (phase >> 2) & 1;
+        chip->rm_hh_bit3 = (phase >> 3) & 1;
+        chip->rm_hh_bit7 = (phase >> 7) & 1;
+        chip->rm_hh_bit8 = (phase >> 8) & 1;
+    }
+    if (slot->slot_num == 17 && (chip->rhy & 0x20)) // tc
     {
-        chip->noise ^= 0x800302;
+        chip->rm_tc_bit3 = (phase >> 3) & 1;
+        chip->rm_tc_bit5 = (phase >> 5) & 1;
     }
-    chip->noise >>= 1;
+    if (chip->rhy & 0x20)
+    {
+        rm_xor = (chip->rm_hh_bit2 ^ chip->rm_hh_bit7)
+               | (chip->rm_hh_bit3 ^ chip->rm_tc_bit5)
+               | (chip->rm_tc_bit3 ^ chip->rm_tc_bit5);
+        switch (slot->slot_num)
+        {
+        case 13: // hh
+            slot->pg_phase_out = rm_xor << 9;
+            if (rm_xor ^ (noise & 1))
+            {
+                slot->pg_phase_out |= 0xd0;
+            }
+            else
+            {
+                slot->pg_phase_out |= 0x34;
+            }
+            break;
+        case 16: // sd
+            slot->pg_phase_out = (chip->rm_hh_bit8 << 9)
+                               | ((chip->rm_hh_bit8 ^ (noise & 1)) << 8);
+            break;
+        case 17: // tc
+            slot->pg_phase_out = (rm_xor << 9) | 0x80;
+            break;
+        default:
+            break;
+        }
+    }
+    n_bit = ((noise >> 14) ^ noise) & 0x01;
+    chip->noise = (noise >> 1) | (n_bit << 22);
 }
 
 //
@@ -601,7 +626,6 @@
     slot->reg_type = (data >> 5) & 0x01;
     slot->reg_ksr = (data >> 4) & 0x01;
     slot->reg_mult = data & 0x0f;
-    OPL3_EnvelopeUpdateRate(slot);
 }
 
 static void OPL3_SlotWrite40(opl3_slot *slot, Bit8u data)
@@ -615,7 +639,6 @@
 {
     slot->reg_ar = (data >> 4) & 0x0f;
     slot->reg_dr = data & 0x0f;
-    OPL3_EnvelopeUpdateRate(slot);
 }
 
 static void OPL3_SlotWrite80(opl3_slot *slot, Bit8u data)
@@ -626,7 +649,6 @@
         slot->reg_sl = 0x1f;
     }
     slot->reg_rr = data & 0x0f;
-    OPL3_EnvelopeUpdateRate(slot);
 }
 
 static void OPL3_SlotWriteE0(opl3_slot *slot, Bit8u data)
@@ -638,21 +660,11 @@
     }
 }
 
-static void OPL3_SlotGeneratePhase(opl3_slot *slot, Bit16u phase)
-{
-    slot->out = envelope_sin[slot->reg_wf](phase, slot->eg_out);
-}
-
 static void OPL3_SlotGenerate(opl3_slot *slot)
 {
-    OPL3_SlotGeneratePhase(slot, (Bit16u)(slot->pg_phase >> 9) + *slot->mod);
+    slot->out = envelope_sin[slot->reg_wf](slot->pg_phase_out + *slot->mod, slot->eg_out);
 }
 
-static void OPL3_SlotGenerateZM(opl3_slot *slot)
-{
-    OPL3_SlotGeneratePhase(slot, (Bit16u)(slot->pg_phase >> 9));
-}
-
 static void OPL3_SlotCalcFB(opl3_slot *slot)
 {
     if (slot->channel->fb != 0x00)
@@ -702,6 +714,8 @@
             chip->channel[chnum].chtype = ch_drum;
         }
         OPL3_ChannelSetupAlg(channel6);
+        OPL3_ChannelSetupAlg(channel7);
+        OPL3_ChannelSetupAlg(channel8);
         //hh
         if (chip->rhy & 0x01)
         {
@@ -773,8 +787,6 @@
                  | ((channel->f_num >> (0x09 - channel->chip->nts)) & 0x01);
     OPL3_EnvelopeUpdateKSL(channel->slots[0]);
     OPL3_EnvelopeUpdateKSL(channel->slots[1]);
-    OPL3_EnvelopeUpdateRate(channel->slots[0]);
-    OPL3_EnvelopeUpdateRate(channel->slots[1]);
     if (channel->chip->newm && channel->chtype == ch_4op)
     {
         channel->pair->f_num = channel->f_num;
@@ -781,8 +793,6 @@
         channel->pair->ksv = channel->ksv;
         OPL3_EnvelopeUpdateKSL(channel->pair->slots[0]);
         OPL3_EnvelopeUpdateKSL(channel->pair->slots[1]);
-        OPL3_EnvelopeUpdateRate(channel->pair->slots[0]);
-        OPL3_EnvelopeUpdateRate(channel->pair->slots[1]);
     }
 }
 
@@ -798,8 +808,6 @@
                  | ((channel->f_num >> (0x09 - channel->chip->nts)) & 0x01);
     OPL3_EnvelopeUpdateKSL(channel->slots[0]);
     OPL3_EnvelopeUpdateKSL(channel->slots[1]);
-    OPL3_EnvelopeUpdateRate(channel->slots[0]);
-    OPL3_EnvelopeUpdateRate(channel->slots[1]);
     if (channel->chip->newm && channel->chtype == ch_4op)
     {
         channel->pair->f_num = channel->f_num;
@@ -807,8 +815,6 @@
         channel->pair->ksv = channel->ksv;
         OPL3_EnvelopeUpdateKSL(channel->pair->slots[0]);
         OPL3_EnvelopeUpdateKSL(channel->pair->slots[1]);
-        OPL3_EnvelopeUpdateRate(channel->pair->slots[0]);
-        OPL3_EnvelopeUpdateRate(channel->pair->slots[1]);
     }
 }
 
@@ -816,6 +822,12 @@
 {
     if (channel->chtype == ch_drum)
     {
+        if (channel->ch_num == 7 || channel->ch_num == 8)
+        {
+            channel->slots[0]->mod = &channel->chip->zeromod;
+            channel->slots[1]->mod = &channel->chip->zeromod;
+            return;
+        }
         switch (channel->alg & 0x01)
         {
         case 0x00:
@@ -942,7 +954,7 @@
     }
     else
     {
-        channel->cha = channel->chb = ~0;
+        channel->cha = channel->chb = (Bit16u)~0;
     }
 }
 
@@ -1031,96 +1043,23 @@
     return (Bit16s)sample;
 }
 
-static void OPL3_GenerateRhythm1(opl3_chip *chip)
-{
-    opl3_channel *channel6;
-    opl3_channel *channel7;
-    opl3_channel *channel8;
-    Bit16u phase14;
-    Bit16u phase17;
-    Bit16u phase;
-    Bit16u phasebit;
-
-    channel6 = &chip->channel[6];
-    channel7 = &chip->channel[7];
-    channel8 = &chip->channel[8];
-    OPL3_SlotGenerate(channel6->slots[0]);
-    phase14 = (channel7->slots[0]->pg_phase >> 9) & 0x3ff;
-    phase17 = (channel8->slots[1]->pg_phase >> 9) & 0x3ff;
-    phase = 0x00;
-    //hh tc phase bit
-    phasebit = ((phase14 & 0x08) | (((phase14 >> 5) ^ phase14) & 0x04)
-             | (((phase17 >> 2) ^ phase17) & 0x08)) ? 0x01 : 0x00;
-    //hh
-    phase = (phasebit << 9)
-          | (0x34 << ((phasebit ^ (chip->noise & 0x01)) << 1));
-    OPL3_SlotGeneratePhase(channel7->slots[0], phase);
-    //tt
-    OPL3_SlotGenerateZM(channel8->slots[0]);
-}
-
-static void OPL3_GenerateRhythm2(opl3_chip *chip)
-{
-    opl3_channel *channel6;
-    opl3_channel *channel7;
-    opl3_channel *channel8;
-    Bit16u phase14;
-    Bit16u phase17;
-    Bit16u phase;
-    Bit16u phasebit;
-
-    channel6 = &chip->channel[6];
-    channel7 = &chip->channel[7];
-    channel8 = &chip->channel[8];
-    OPL3_SlotGenerate(channel6->slots[1]);
-    phase14 = (channel7->slots[0]->pg_phase >> 9) & 0x3ff;
-    phase17 = (channel8->slots[1]->pg_phase >> 9) & 0x3ff;
-    phase = 0x00;
-    //hh tc phase bit
-    phasebit = ((phase14 & 0x08) | (((phase14 >> 5) ^ phase14) & 0x04)
-             | (((phase17 >> 2) ^ phase17) & 0x08)) ? 0x01 : 0x00;
-    //sd
-    phase = (0x100 << ((phase14 >> 8) & 0x01)) ^ ((chip->noise & 0x01) << 8);
-    OPL3_SlotGeneratePhase(channel7->slots[1], phase);
-    //tc
-    phase = 0x100 | (phasebit << 9);
-    OPL3_SlotGeneratePhase(channel8->slots[1], phase);
-}
-
 void OPL3_Generate(opl3_chip *chip, Bit16s *buf)
 {
     Bit8u ii;
     Bit8u jj;
     Bit16s accm;
+    Bit8u shift = 0;
 
     buf[1] = OPL3_ClipSample(chip->mixbuff[1]);
 
-    for (ii = 0; ii < 12; ii++)
+    for (ii = 0; ii < 15; ii++)
     {
         OPL3_SlotCalcFB(&chip->slot[ii]);
-        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_EnvelopeCalc(&chip->slot[ii]);
+        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_SlotGenerate(&chip->slot[ii]);
     }
 
-    for (ii = 12; ii < 15; ii++)
-    {
-        OPL3_SlotCalcFB(&chip->slot[ii]);
-        OPL3_PhaseGenerate(&chip->slot[ii]);
-        OPL3_EnvelopeCalc(&chip->slot[ii]);
-    }
-
-    if (chip->rhy & 0x20)
-    {
-        OPL3_GenerateRhythm1(chip);
-    }
-    else
-    {
-        OPL3_SlotGenerate(&chip->slot[12]);
-        OPL3_SlotGenerate(&chip->slot[13]);
-        OPL3_SlotGenerate(&chip->slot[14]);
-    }
-
     chip->mixbuff[0] = 0;
     for (ii = 0; ii < 18; ii++)
     {
@@ -1135,28 +1074,18 @@
     for (ii = 15; ii < 18; ii++)
     {
         OPL3_SlotCalcFB(&chip->slot[ii]);
-        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_EnvelopeCalc(&chip->slot[ii]);
+        OPL3_PhaseGenerate(&chip->slot[ii]);
+        OPL3_SlotGenerate(&chip->slot[ii]);
     }
 
-    if (chip->rhy & 0x20)
-    {
-        OPL3_GenerateRhythm2(chip);
-    }
-    else
-    {
-        OPL3_SlotGenerate(&chip->slot[15]);
-        OPL3_SlotGenerate(&chip->slot[16]);
-        OPL3_SlotGenerate(&chip->slot[17]);
-    }
-
     buf[0] = OPL3_ClipSample(chip->mixbuff[0]);
 
     for (ii = 18; ii < 33; ii++)
     {
         OPL3_SlotCalcFB(&chip->slot[ii]);
-        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_EnvelopeCalc(&chip->slot[ii]);
+        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_SlotGenerate(&chip->slot[ii]);
     }
 
@@ -1174,13 +1103,11 @@
     for (ii = 33; ii < 36; ii++)
     {
         OPL3_SlotCalcFB(&chip->slot[ii]);
-        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_EnvelopeCalc(&chip->slot[ii]);
+        OPL3_PhaseGenerate(&chip->slot[ii]);
         OPL3_SlotGenerate(&chip->slot[ii]);
     }
 
-    OPL3_NoiseGenerate(chip);
-
     if ((chip->timer & 0x3f) == 0x3f)
     {
         chip->tremolopos = (chip->tremolopos + 1) % 210;
@@ -1201,6 +1128,39 @@
 
     chip->timer++;
 
+    chip->eg_add = 0;
+    if (chip->eg_timer)
+    {
+        while (shift < 36 && ((chip->eg_timer >> shift) & 1) == 0)
+        {
+            shift++;
+        }
+        if (shift > 12)
+        {
+            chip->eg_add = 0;
+        }
+        else
+        {
+            chip->eg_add = shift + 1;
+        }
+    }
+
+    if (chip->eg_timerrem || chip->eg_state)
+    {
+        if (chip->eg_timer == 0xfffffffff)
+        {
+            chip->eg_timer = 0;
+            chip->eg_timerrem = 1;
+        }
+        else
+        {
+            chip->eg_timer++;
+            chip->eg_timerrem = 0;
+        }
+    }
+
+    chip->eg_state ^= 1;
+
     while (chip->writebuf[chip->writebuf_cur].time <= chip->writebuf_samplecnt)
     {
         if (!(chip->writebuf[chip->writebuf_cur].reg & 0x200))
@@ -1243,8 +1203,9 @@
         chip->slot[slotnum].mod = &chip->zeromod;
         chip->slot[slotnum].eg_rout = 0x1ff;
         chip->slot[slotnum].eg_out = 0x1ff;
-        chip->slot[slotnum].eg_gen = envelope_gen_num_off;
+        chip->slot[slotnum].eg_gen = envelope_gen_num_release;
         chip->slot[slotnum].trem = (Bit8u*)&chip->zeromod;
+        chip->slot[slotnum].slot_num = slotnum;
     }
     for (channum = 0; channum < 18; channum++)
     {
@@ -1266,11 +1227,12 @@
         chip->channel[channum].out[2] = &chip->zeromod;
         chip->channel[channum].out[3] = &chip->zeromod;
         chip->channel[channum].chtype = ch_2op;
-        chip->channel[channum].cha = ~0;
-        chip->channel[channum].chb = ~0;
+        chip->channel[channum].cha = 0xffff;
+        chip->channel[channum].chb = 0xffff;
+        chip->channel[channum].ch_num = channum;
         OPL3_ChannelSetupAlg(&chip->channel[channum]);
     }
-    chip->noise = 0x306600;
+    chip->noise = 1;
     chip->rateratio = (samplerate << RSM_FRAC) / 49716;
     chip->tremoloshift = 4;
     chip->vibshift = 1;
--- a/opl/opl3.h
+++ b/opl/opl3.h
@@ -1,5 +1,5 @@
 //
-// Copyright (C) 2013-2016 Alexey Khokholov (Nuke.YKT)
+// Copyright (C) 2013-2018 Alexey Khokholov (Nuke.YKT)
 //
 // This program is free software; you can redistribute it and/or
 // modify it under the terms of the GNU General Public License
@@ -20,8 +20,10 @@
 //          Tremolo and phase generator calculation information.
 //      OPLx decapsulated(Matthew Gambrell, Olli Niemitalo):
 //          OPL2 ROMs.
+//      siliconpr0n.org(John McMaster, digshadow):
+//          YMF262 and VRC VII decaps and die shots.
 //
-// version: 1.7.4
+// version: 1.8
 //
 
 #ifndef OPL_OPL3_H
@@ -73,8 +75,10 @@
     Bit8u reg_rr;
     Bit8u reg_wf;
     Bit8u key;
+    Bit32u pg_reset;
     Bit32u pg_phase;
-    Bit32u timer;
+    Bit16u pg_phase_out;
+    Bit8u slot_num;
 };
 
 struct _opl3_channel {
@@ -90,6 +94,7 @@
     Bit8u alg;
     Bit8u ksv;
     Bit16u cha, chb;
+    Bit8u ch_num;
 };
 
 typedef struct _opl3_writebuf {
@@ -102,6 +107,10 @@
     opl3_channel channel[18];
     opl3_slot slot[36];
     Bit16u timer;
+    Bit64u eg_timer;
+    Bit8u eg_timerrem;
+    Bit8u eg_state;
+    Bit8u eg_add;
     Bit8u newm;
     Bit8u nts;
     Bit8u rhy;
@@ -113,6 +122,12 @@
     Bit32u noise;
     Bit16s zeromod;
     Bit32s mixbuff[2];
+    Bit8u rm_hh_bit2;
+    Bit8u rm_hh_bit3;
+    Bit8u rm_hh_bit7;
+    Bit8u rm_hh_bit8;
+    Bit8u rm_tc_bit3;
+    Bit8u rm_tc_bit5;
     //OPL3L
     Bit32s rateratio;
     Bit32s samplecnt;