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--- opal.cpp.orig 2019-02-23 20:32:00.477658789 +0100
+++ opal.cpp 2019-02-23 20:46:36.745113958 +0100
@@ -13,6 +13,7 @@
- Percussion mode
*/
+#define OPAL_HAVE_SOFT_PANNING 1 /* libADLMIDI */
@@ -133,6 +134,7 @@
void SetOctave(uint16_t oct);
void SetLeftEnable(bool on);
void SetRightEnable(bool on);
+ void SetPan(uint8_t pan);
void SetFeedback(uint16_t val);
void SetModulationType(uint16_t type);
@@ -158,6 +160,7 @@
Channel * ChannelPair;
bool Enable;
bool LeftEnable, RightEnable;
+ uint16_t LeftPan, RightPan;
};
public:
@@ -166,6 +169,7 @@
void SetSampleRate(int sample_rate);
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);
protected:
@@ -191,6 +195,7 @@
static const uint16_t RateTables[4][8];
static const uint16_t ExpTable[256];
static const uint16_t LogSinTable[256];
+ static const uint16_t PanLawTable[128];
};
//--------------------------------------------------------------------------------------------------
const uint16_t Opal::RateTables[4][8] = {
@@ -237,6 +242,28 @@
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,
};
+//--------------------------------------------------------------------------------------------------
+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
+};
@@ -342,6 +369,10 @@
for (int i = 0; i < NumOperators; i++)
Op[i].ComputeRates();
+ // Initialise channel panning at center.
+ for (int i = 0; i < NumChannels; i++)
+ Chan[i].SetPan(64);
+
SetSampleRate(sample_rate);
}
@@ -533,6 +564,19 @@
//==================================================================================================
+// 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
// stereo channel) which will sound correct when played back at the sample rate given when the
// class was constructed.
@@ -727,6 +771,9 @@
left = LeftEnable ? out : 0;
right = RightEnable ? out : 0;
+
+ left = left * LeftPan / 65536;
+ right = right * RightPan / 65536;
}
@@ -793,6 +840,18 @@
}
+
+//==================================================================================================
+// 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.
|