mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-09-20 05:34:47 +00:00
Add Opal soft panning support
This commit is contained in:
parent
5b33b73da9
commit
2dcbe4be90
1 changed files with 72 additions and 12 deletions
|
@ -1,8 +1,3 @@
|
||||||
// This is the Opal OPL3 emulator from Reality Adlib Tracker v2.0a (http://www.3eality.com/productions/reality-adlib-tracker).
|
|
||||||
// It was released by Shayde/Reality into the public domain.
|
|
||||||
// Minor modifications to silence some warnings and fix a bug in the envelope generator have been applied.
|
|
||||||
// Additional fixes by JP Cimalando.
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
|
||||||
The Opal OPL3 emulator.
|
The Opal OPL3 emulator.
|
||||||
|
@ -19,6 +14,12 @@
|
||||||
|
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
// This is the Opal OPL3 emulator from Reality Adlib Tracker v2.0a (http://www.3eality.com/productions/reality-adlib-tracker).
|
||||||
|
// It was released by Shayde/Reality into the public domain.
|
||||||
|
// Minor modifications to silence some warnings and fix a bug in the envelope generator have been applied.
|
||||||
|
// Additional fixes by JP Cimalando.
|
||||||
|
// Soft panning support by Wohlstand.
|
||||||
|
|
||||||
#include <cstdint>
|
#include <cstdint>
|
||||||
|
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
|
@ -134,6 +135,7 @@ class Opal {
|
||||||
void SetOctave(uint16_t oct);
|
void SetOctave(uint16_t oct);
|
||||||
void SetLeftEnable(bool on);
|
void SetLeftEnable(bool on);
|
||||||
void SetRightEnable(bool on);
|
void SetRightEnable(bool on);
|
||||||
|
void SetPan(uint8_t pan);
|
||||||
void SetFeedback(uint16_t val);
|
void SetFeedback(uint16_t val);
|
||||||
void SetModulationType(uint16_t type);
|
void SetModulationType(uint16_t type);
|
||||||
|
|
||||||
|
@ -160,6 +162,7 @@ class Opal {
|
||||||
Channel *ChannelPair;
|
Channel *ChannelPair;
|
||||||
bool Enable;
|
bool Enable;
|
||||||
bool LeftEnable, RightEnable;
|
bool LeftEnable, RightEnable;
|
||||||
|
uint16_t LeftPan, RightPan;
|
||||||
};
|
};
|
||||||
|
|
||||||
public:
|
public:
|
||||||
|
@ -170,6 +173,7 @@ class Opal {
|
||||||
|
|
||||||
void SetSampleRate(int sample_rate);
|
void SetSampleRate(int sample_rate);
|
||||||
void Port(uint16_t reg_num, uint8_t val);
|
void Port(uint16_t reg_num, uint8_t val);
|
||||||
|
void Pan(uint16_t reg_num, uint8_t pan);
|
||||||
void Sample(int16_t *left, int16_t *right);
|
void Sample(int16_t *left, int16_t *right);
|
||||||
|
|
||||||
protected:
|
protected:
|
||||||
|
@ -195,6 +199,7 @@ class Opal {
|
||||||
static const uint16_t RateTables[4][8];
|
static const uint16_t RateTables[4][8];
|
||||||
static const uint16_t ExpTable[256];
|
static const uint16_t ExpTable[256];
|
||||||
static const uint16_t LogSinTable[256];
|
static const uint16_t LogSinTable[256];
|
||||||
|
static const uint16_t PanLawTable[128];
|
||||||
};
|
};
|
||||||
// clang-format off
|
// clang-format off
|
||||||
//--------------------------------------------------------------------------------------------------
|
//--------------------------------------------------------------------------------------------------
|
||||||
|
@ -242,6 +247,28 @@ const uint16_t Opal::LogSinTable[0x100] = {
|
||||||
7, 7, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2,
|
7, 7, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2,
|
||||||
2, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
2, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
};
|
};
|
||||||
|
//--------------------------------------------------------------------------------------------------
|
||||||
|
const uint16_t Opal::PanLawTable[128] =
|
||||||
|
{
|
||||||
|
65535, 65529, 65514, 65489, 65454, 65409, 65354, 65289,
|
||||||
|
65214, 65129, 65034, 64929, 64814, 64689, 64554, 64410,
|
||||||
|
64255, 64091, 63917, 63733, 63540, 63336, 63123, 62901,
|
||||||
|
62668, 62426, 62175, 61914, 61644, 61364, 61075, 60776,
|
||||||
|
60468, 60151, 59825, 59489, 59145, 58791, 58428, 58057,
|
||||||
|
57676, 57287, 56889, 56482, 56067, 55643, 55211, 54770,
|
||||||
|
54320, 53863, 53397, 52923, 52441, 51951, 51453, 50947,
|
||||||
|
50433, 49912, 49383, 48846, 48302, 47750, 47191,
|
||||||
|
46340, // Center left
|
||||||
|
46340, // Center right
|
||||||
|
45472, 44885, 44291, 43690, 43083, 42469, 41848, 41221,
|
||||||
|
40588, 39948, 39303, 38651, 37994, 37330, 36661, 35986,
|
||||||
|
35306, 34621, 33930, 33234, 32533, 31827, 31116, 30400,
|
||||||
|
29680, 28955, 28225, 27492, 26754, 26012, 25266, 24516,
|
||||||
|
23762, 23005, 22244, 21480, 20713, 19942, 19169, 18392,
|
||||||
|
17613, 16831, 16046, 15259, 14469, 13678, 12884, 12088,
|
||||||
|
11291, 10492, 9691, 8888, 8085, 7280, 6473, 5666,
|
||||||
|
4858, 4050, 3240, 2431, 1620, 810, 0
|
||||||
|
};
|
||||||
// clang-format on
|
// clang-format on
|
||||||
|
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
|
@ -339,6 +366,13 @@ void Opal::Init(int sample_rate) {
|
||||||
for (int i = 0; i < NumOperators; i++)
|
for (int i = 0; i < NumOperators; i++)
|
||||||
Op[i].ComputeRates();
|
Op[i].ComputeRates();
|
||||||
|
|
||||||
|
// Initialise channel panning at center.
|
||||||
|
for (int i = 0; i < NumChannels; i++) {
|
||||||
|
Chan[i].SetPan(64);
|
||||||
|
Chan[i].SetLeftEnable(true);
|
||||||
|
Chan[i].SetRightEnable(true);
|
||||||
|
}
|
||||||
|
|
||||||
SetSampleRate(sample_rate);
|
SetSampleRate(sample_rate);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -392,7 +426,11 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
|
||||||
|
|
||||||
// The 4-op channels are 0, 1, 2, 9, 10, 11
|
// The 4-op channels are 0, 1, 2, 9, 10, 11
|
||||||
uint16_t chan = static_cast<uint16_t>(i < 3 ? i : i + 6);
|
uint16_t chan = static_cast<uint16_t>(i < 3 ? i : i + 6);
|
||||||
|
// cppcheck false-positive
|
||||||
|
// cppcheck-suppress arrayIndexOutOfBounds
|
||||||
Channel *primary = &Chan[chan];
|
Channel *primary = &Chan[chan];
|
||||||
|
// cppcheck false-positive
|
||||||
|
// cppcheck-suppress arrayIndexOutOfBounds
|
||||||
Channel *secondary = &Chan[chan + 3];
|
Channel *secondary = &Chan[chan + 3];
|
||||||
|
|
||||||
if (val & mask) {
|
if (val & mask) {
|
||||||
|
@ -439,7 +477,7 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
|
||||||
|
|
||||||
Channel &chan = Chan[chan_num];
|
Channel &chan = Chan[chan_num];
|
||||||
|
|
||||||
// Registers Ax and Bx affect both channels
|
// Registers Ax and Cx affect both channels
|
||||||
Channel *chans[2] = {&chan, chan.GetChannelPair()};
|
Channel *chans[2] = {&chan, chan.GetChannelPair()};
|
||||||
int numchans = chans[1] ? 2 : 1;
|
int numchans = chans[1] ? 2 : 1;
|
||||||
|
|
||||||
|
@ -533,6 +571,16 @@ void Opal::Port(uint16_t reg_num, uint8_t val) {
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
//==================================================================================================
|
||||||
|
// Set panning on the channel designated by the register number.
|
||||||
|
// This is extended functionality.
|
||||||
|
//==================================================================================================
|
||||||
|
void Opal::Pan(uint16_t reg_num, uint8_t pan) {
|
||||||
|
uint8_t high = (reg_num >> 8) & 1;
|
||||||
|
uint8_t regm = reg_num & 0xff;
|
||||||
|
Chan[9 * high + (regm & 0x0f)].SetPan(pan);
|
||||||
|
}
|
||||||
|
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
// Generate sample. Every time you call this you will get two signed 16-bit samples (one for each
|
// Generate sample. Every time you call this you will get two signed 16-bit samples (one for each
|
||||||
// stereo channel) which will sound correct when played back at the sample rate given when the
|
// stereo channel) which will sound correct when played back at the sample rate given when the
|
||||||
|
@ -553,8 +601,8 @@ void Opal::Sample(int16_t *left, int16_t *right) {
|
||||||
|
|
||||||
// Mix with the partial accumulation
|
// Mix with the partial accumulation
|
||||||
int32_t omblend = SampleRate - SampleAccum;
|
int32_t omblend = SampleRate - SampleAccum;
|
||||||
*left = static_cast<uint16_t>((LastOutput[0] * omblend + CurrOutput[0] * SampleAccum) / SampleRate);
|
*left = static_cast<int16_t>((LastOutput[0] * omblend + CurrOutput[0] * SampleAccum) / SampleRate);
|
||||||
*right = static_cast<uint16_t>((LastOutput[1] * omblend + CurrOutput[1] * SampleAccum) / SampleRate);
|
*right = static_cast<int16_t>((LastOutput[1] * omblend + CurrOutput[1] * SampleAccum) / SampleRate);
|
||||||
|
|
||||||
SampleAccum += OPL3SampleRate;
|
SampleAccum += OPL3SampleRate;
|
||||||
}
|
}
|
||||||
|
@ -582,14 +630,14 @@ void Opal::Output(int16_t &left, int16_t &right) {
|
||||||
else if (leftmix > 0x7FFF)
|
else if (leftmix > 0x7FFF)
|
||||||
left = 0x7FFF;
|
left = 0x7FFF;
|
||||||
else
|
else
|
||||||
left = static_cast<uint16_t>(leftmix);
|
left = static_cast<int16_t>(leftmix);
|
||||||
|
|
||||||
if (rightmix < -0x8000)
|
if (rightmix < -0x8000)
|
||||||
right = -0x8000;
|
right = -0x8000;
|
||||||
else if (rightmix > 0x7FFF)
|
else if (rightmix > 0x7FFF)
|
||||||
right = 0x7FFF;
|
right = 0x7FFF;
|
||||||
else
|
else
|
||||||
right = static_cast<uint16_t>(rightmix);
|
right = static_cast<int16_t>(rightmix);
|
||||||
|
|
||||||
Clock++;
|
Clock++;
|
||||||
|
|
||||||
|
@ -725,6 +773,9 @@ void Opal::Channel::Output(int16_t &left, int16_t &right) {
|
||||||
|
|
||||||
left = LeftEnable ? out : 0;
|
left = LeftEnable ? out : 0;
|
||||||
right = RightEnable ? out : 0;
|
right = RightEnable ? out : 0;
|
||||||
|
|
||||||
|
left = left * LeftPan / 65536;
|
||||||
|
right = right * RightPan / 65536;
|
||||||
}
|
}
|
||||||
|
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
|
@ -774,6 +825,15 @@ void Opal::Channel::SetLeftEnable(bool on) { LeftEnable = on; }
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
void Opal::Channel::SetRightEnable(bool on) { RightEnable = on; }
|
void Opal::Channel::SetRightEnable(bool on) { RightEnable = on; }
|
||||||
|
|
||||||
|
//==================================================================================================
|
||||||
|
// Pan the channel to the position given.
|
||||||
|
//==================================================================================================
|
||||||
|
void Opal::Channel::SetPan(uint8_t pan) {
|
||||||
|
pan &= 127;
|
||||||
|
LeftPan = PanLawTable[pan];
|
||||||
|
RightPan = PanLawTable[127 - pan];
|
||||||
|
}
|
||||||
|
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
// Set the channel feedback amount.
|
// Set the channel feedback amount.
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
|
@ -1117,8 +1177,8 @@ void Opal::Operator::SetFrequencyMultiplier(uint16_t scale) {
|
||||||
//==================================================================================================
|
//==================================================================================================
|
||||||
void Opal::Operator::SetKeyScale(uint16_t scale) {
|
void Opal::Operator::SetKeyScale(uint16_t scale) {
|
||||||
|
|
||||||
static constexpr uint8_t kslShift[4] = {8, 1, 2, 0};
|
static const uint8_t kslShift[4] = {8, 1, 2, 0};
|
||||||
KeyScaleShift = kslShift[scale];
|
KeyScaleShift = kslShift[scale & 3];
|
||||||
ComputeKeyScaleLevel();
|
ComputeKeyScaleLevel();
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue