diff options
Diffstat (limited to 'src/chips/opal/old/opal-pan.diff')
| -rw-r--r-- | src/chips/opal/old/opal-pan.diff | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/chips/opal/old/opal-pan.diff b/src/chips/opal/old/opal-pan.diff new file mode 100644 index 0000000..a00a9fc --- /dev/null +++ b/src/chips/opal/old/opal-pan.diff @@ -0,0 +1,131 @@ +--- 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. |