2004-06-11 Dag Lem <resid@nimrod.no> * Version 0.16 released. * envelope.h (EnvelopeGenerator::clock): Corrected off-by-one error in check for ADSR delay bug in delta_t cycle interface. * filter.cc (Filter::set_chip_model): Initialize filter cutoff mappings before call to set_chip_model. * sid.cc (SID::set_sampling_parameters): Build shifted FIR tables with samples according to the sampling frequency. (SID::clock_resample_interpolate): New function; factorized linear interpolation out from filter convolutions, and made convolutions vectorizable. (SID::clock_resample_fast): New function; single convolution, same accuracy as with interpolation by using more filter tables. (SID::State, SID::read_state, SID::write_state): Read and write rate_counter_period and exponential_counter_period. Read sustain value. 2003-10-20 Dag Lem <resid@nimrod.no> * Version 0.15 released. * envelope.h (EnvelopeGenerator): Added public State enum. (EnvelopeGenerator::clock): Rate counter is 15 bits, count rate_period - 1 after wrapping from 0x8000 to 0 in ADSR delay bug. * sid.cc, sid.h (SID::State): Added envelope_state. (SID::State::write_state): Restore register 0x18. (SID::set_sampling_parameters): Scale resampling filter to avoid clipping. (SID::clock_resample): Saturated arithmetics to avoid clipping. 2002-12-31 Dag Lem <resid@nimrod.no> * Version 0.14 released. * envelope.h (EnvelopeGenerator::clock): Corrected one cycle error in ADSR delay bug. Only load the exponential counter period at the envelope counter values 255, 93, 54, 26, 14, 6, 0. * filter.cc (Filter::set_chip_model): Call set_w0() and set_Q() to update filter settings. (Filter::set_w0): Limit cutoff frequency for both 1 cycle and delta_t cycle filter. * filter.h (Filter::clock): Mix in external audio input. * sid.cc, sid.h (SID::input): New function; accepts external audio input sample. * spline.h (PointPlotter::operator ()): Clamp negative values to zero. * voice.cc, voice.h: Changed misleading name wave_DC to wave_zero. * wave.h (WaveformGenerator::clock): Corrected bug in check for accumulator bit 19 in noise register shift. 2002-01-19 Dag Lem <resid@nimrod.no> * Version 0.13 released. * configure.in: Replaced AC_TRY_COMPILER with AC_TRY_COMPILE, removed AC_PROG_RANLIB. * envelope.h (EnvelopeGenerator::clock): Reset rate_step on state change. * extfilt.cc (ExternalFilter::set_chip_model): New calculation of maximum mixer DC level. * filter.cc (Filter::set_chip_model): Moved calculation of voice_DC to voice.cc, corrected calculation of mixer_DC. * filter.h (Filter::output): Mixer output is not inverted. * sid.cc (SID::set_chip_model): Call voice.set_chip_model instead of voice.wave.set_chip_model. * voice.cc (Voice::Voice): Call set_chip_model. (Voice::set_chip_model): New function; model both waveform D/A converter and envelope multiplying D/A converter DC offsets. * voice.h (Voice::output): Add both waveform D/A converter and envelope multiplying D/A converter DC offsets. * wave.h (WaveformGenerator::output____): Reverted to output minimum wave level when no waveform is selected. The maximum and minimum wave output levels are interchanged in C= Hacking Issue #20. 2001-10-20 Dag Lem <resid@nimrod.no> * Version 0.12 released. * envelope.cc, envelope.h, filter.cc, filter.h, wave.cc, wave.h: Removed bool usage. This avoids unnecessary conversion to 1/0. * filter.cc (Filter::set_chip_model): New function; selects voice and mixer DC offsets and mapping from the FC registers to filter cutoff frequency. The voice and mixer DC offsets for the MOS6581 are calculated from measurements made by H�rsfalvi, Levente in C= Hacking Issue #20. (Filter::Filter): Call set_chip_model. (Filter::f0_6581, Filter::f0_8580): Separate FC mapping tables. (Filter::f0_points_6581, Filter::f0_points_8580): Separate FC mapping points. * extfilt.cc, extfilt.h (ExternalFilter::set_chip_model): New function supporting separate DC correction for MOS6581 and MOS8580. * sid.cc, sid.h (SID::adjust_sampling_frequency): New function for on-the-fly adjustment of sampling frequency. (SID::clock_fast): Corrected sample calculation. (SID::set_chip_model): Set filter chip model. (SID::output): Added audio clipping. (SID::clock, SID::clock_fast, SID::clock_interpolate, SID::clock_resample): Added sample interleaving. * spline.h (interpolate): Generalized to accept repeated points to introduce points of non-differentiability and discontinuity. * wave.h (WaveformGenerator::output____): No selected waveform yields maximum wave output level. This was found by H�rsfalvi, Levente in C= Hacking Issue #20. (WaveformGenerator::clock): Optimized for speed (no division). 2001-03-10 Dag Lem <resid@nimrod.no> * Version 0.11 released. * configure.in: Disable building of shared library by default. Control inlining with RESID_INLINING (0 or 1) and RESID_INLINE (blank or "inline"). * envelope.h, extfilt.h, filter.h, voice.h, wave.h: inline keyword in both function declarations and function definitions. * samp2src.pl: Beautified Perl code. * sid.h, sid.cc: Replaced voice variables with array. Removed filter variables from SID::State. (SID::clock): New audio sample generating interface. Three clocking methods are available; clocking at output sample frequency, clocking at cycle frequency with linear sample interpolation, and clocking at cycle frequency with audio resampling. (SID::clock_fast, SID::clock_interpolate, SID::clock_resample): New functions called by SID::clock. (SID::set_sampling_parameters): New function to set up SID for sample generation. The FIR table used in SID::clock_resample is calculated here. (SID::I0): 0th order modified Bessel function to calculate Kaiser window. * siddefs.h: Control inlining with RESID_INLINING (0 or 1) and RESID_INLINE (blank or "inline"). Added enum sampling_method. * voice.h, voice.cc (Voice::set_sync_source): Moved setting of sync source from constructor. * wave.h, wave.cc (WaveformGenerator::set_sync_source): Moved setting of sync source from constructor. 2000-11-22 Dag Lem <resid@nimrod.no> * Version 0.10 released. * configure.in, Makefile.am: Use libtool to build library. The hack to "disable" install is removed. * extfilt.h, filter.h: Moved filter stability code from sid.cc. * sid.cc (SID::clock): Moved filter stability code to extfilt.h/filter.h. Don't clock the rest of the chip more frequently than necessary. * wave.cc: Typecast for pedantic (and probably incorrect) compilers. 2000-05-18 Dag Lem <resid@nimrod.no> * Version 0.9 released. * filter.h (Filter::output): The sum of the filter outputs is no longer weighted. 1999-06-24 Dag Lem <resid@nimrod.no> * Version 0.8 released. * filter.h, filter.cc, wave.h, wave.cc: Typecasts for pedantic compilers. * filter.h (Filter::clock): Voice 3 is only silenced by voice3off if it is not routed through the filter. * sid.cc (SID::State): Added constructor for proper initalization. * spline.h: Inlined template functions to avoid problems at link time with certain compilers. 1999-02-25 Dag Lem <resid@nimrod.no> * Version 0.7 released. * configure.in: Check whether compiler supports bool. * extfilt.h, extfilt.cc: Implementation of C64 filter, external to the SID chip. * filter.h (Filter::clock): Optimized filter routing using a switch. (Filter::output): Optimized filter mixing using a switch, avoiding integer division. Corrected sign of filtered output, which is inverted compared to unfiltered output. * filter.cc (Filter::set_w0): Removed use of M_PI and math.h functions. Use spline table to map fc to w0. (Filter::fc_default): Return array of FC spline interpolation points. (Filter::fc_plotter): Return FC spline plotter object. * sid.h (SID::enable_external_filter): Enable/disable external filter. (SID::fc_default): Return array of FC spline interpolation points. (SID::fc_plotter): Return FC spline plotter object. (SID::State, SID::read_state, SID::write_state): Read and write complete SID state. * sid.cc (SID::clock): Age bus value. Clock external filter. (SID::enable_external_filter): Enable/disable external filter. * spline.h: Spline implementation. Used to specify mapping from the FC register to filter cutoff frequency. 1998-11-14 Dag Lem <resid@nimrod.no> * Version 0.6 released. * configure.in: Allow compilation in a separate directory. * wave.h (WaveformGenerator::synchronize): Handle special case when a sync source is synced itself on the same cycle as its MSB is set high. * sid.cc (SID::clock): Only clock on MSB on/off for hard sync. 1998-09-06 Dag Lem <resid@nimrod.no> * Version 0.5 released. * version.cc (resid_version_string): Version string with C linkage. * wave.cc (WaveformGenerator::set_chip_model): Emulation of MOS8580 combined waveforms. 1998-08-28 Dag Lem <resid@nimrod.no> * Version 0.4 released. * envelope.h (EnvelopeGenerator::clock): Count up to rate_period twice during ADSR delay bug, and add one extra rate counter step. * filter.cc (Filter::bsd_copysign): Renamed copysign function for compilation on platforms where copysign is implemented as a macro. 1998-08-23 Dag Lem <resid@nimrod.no> * Version 0.3 released. * envelope.h (EnvelopeGenerator::clock): Handle ADSR boundary bug. * envelope.cc (EnvelopeGenerator::rate_counter_period, EnvelopeGenerator::exponential_counter_period): Corrected counter periods. * filter.h (Filter::clock): Optimized for speed (division by shifting). * sid.h (SID::clock): New one-cycle optimized overload of the clock() function. * wave.h (WaveformGenerator::output_P_T): Combined waveform pulse+triangle indexing corrected. (WaveformGenerator::output_P__): Check for test bit to handle pulse+test bit samples. (WaveformGenerator::output): Optimized for speed (inlining). 1998-07-28 Dag Lem <resid@nimrod.no> * Version 0.2 released. * envelope.h (EnvelopeGenerator::clock): Start decay cycle immediately at envelope counter 0xff. New sustain value is zero if the sustain level is raised above the current envelope counter value. (EnvelopeGenerator::step_envelope): Handle ADSR delay bug. * envelope.cc (EnvelopeGenerator::rate_counter_period, EnvelopeGenerator::exponential_counter_period): Corrected counter periods. (EnvelopeGenerator::writeCONTROL_REG): Do not modify rate counter. * filter.cc (Filter::set_Q): Constrain Q to keep filter stable. * sid.h (SID::read, SID::write, SID::bypass_filter): Simplified API routing register access through the SID class. * sid.cc (SID::output): Corrected variable-bit audio output return. (SID::read, SID::write): Allow read of write only registers. 1998-06-09 Dag Lem <resid@nimrod.no> * Version 0.1 released.