mirror of https://github.com/snes9xgit/snes9x.git
732 lines
18 KiB
C++
732 lines
18 KiB
C++
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#include <math.h>
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#include "../snes9x.h"
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#include "apu.h"
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#include "../msu1.h"
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#include "../snapshot.h"
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#include "../display.h"
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#include "hermite_resampler.h"
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#include "bapu/snes/snes.hpp"
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#define APU_DEFAULT_INPUT_RATE 31950 // ~ 59.94Hz
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#define APU_MINIMUM_SAMPLE_COUNT 512
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#define APU_MINIMUM_SAMPLE_BLOCK 128
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#define APU_NUMERATOR_NTSC 15664
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#define APU_DENOMINATOR_NTSC 328125
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#define APU_NUMERATOR_PAL 34176
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#define APU_DENOMINATOR_PAL 709379
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namespace SNES
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{
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#include "bapu/dsp/blargg_endian.h"
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CPU cpu;
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}
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namespace spc
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{
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static apu_callback sa_callback = NULL;
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static void *extra_data = NULL;
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static bool8 sound_in_sync = TRUE;
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static bool8 sound_enabled = FALSE;
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static int buffer_size;
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static int lag_master = 0;
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static int lag = 0;
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static uint8 *landing_buffer = NULL;
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static uint8 *shrink_buffer = NULL;
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static Resampler *resampler = NULL;
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static int32 reference_time;
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static uint32 remainder;
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static const int timing_hack_numerator = 256;
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static int timing_hack_denominator = 256;
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/* Set these to NTSC for now. Will change to PAL in S9xAPUTimingSetSpeedup
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if necessary on game load. */
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static uint32 ratio_numerator = APU_NUMERATOR_NTSC;
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static uint32 ratio_denominator = APU_DENOMINATOR_NTSC;
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static double dynamic_rate_multiplier = 1.0;
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}
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namespace msu
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{
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static int buffer_size;
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static uint8 *landing_buffer = NULL;
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static Resampler *resampler = NULL;
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static int resample_buffer_size = -1;
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static uint8 *resample_buffer = NULL;
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}
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static void EightBitize (uint8 *, int);
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static void DeStereo (uint8 *, int);
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static void ReverseStereo (uint8 *, int);
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static void UpdatePlaybackRate (void);
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static void SPCSnapshotCallback (void);
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static inline int S9xAPUGetClock (int32);
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static inline int S9xAPUGetClockRemainder (int32);
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static void EightBitize (uint8 *buffer, int sample_count)
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{
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uint8 *buf8 = (uint8 *) buffer;
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int16 *buf16 = (int16 *) buffer;
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for (int i = 0; i < sample_count; i++)
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buf8[i] = (uint8) ((buf16[i] / 256) + 128);
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}
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static void DeStereo (uint8 *buffer, int sample_count)
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{
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int16 *buf = (int16 *) buffer;
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int32 s1, s2;
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for (int i = 0; i < (sample_count >> 1); i++)
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{
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s1 = (int32) buf[2 * i];
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s2 = (int32) buf[2 * i + 1];
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buf[i] = (int16) ((s1 + s2) >> 1);
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}
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}
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static void ReverseStereo (uint8 *src_buffer, int sample_count)
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{
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int16 *buffer = (int16 *) src_buffer;
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for (int i = 0; i < sample_count; i += 2)
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{
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buffer[i + 1] ^= buffer[i];
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buffer[i] ^= buffer[i + 1];
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buffer[i + 1] ^= buffer[i];
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}
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}
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bool8 S9xMixSamples (uint8 *buffer, int sample_count)
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{
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static int shrink_buffer_size = -1;
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uint8 *dest;
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if (!Settings.SixteenBitSound || !Settings.Stereo)
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{
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/* We still need both stereo samples for generating the mono sample */
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if (!Settings.Stereo)
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sample_count <<= 1;
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/* We still have to generate 16-bit samples for bit-dropping, too */
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if (shrink_buffer_size < (sample_count << 1))
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{
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delete[] spc::shrink_buffer;
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spc::shrink_buffer = new uint8[sample_count << 1];
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shrink_buffer_size = sample_count << 1;
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}
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dest = spc::shrink_buffer;
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}
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else
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dest = buffer;
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if (Settings.MSU1 && msu::resample_buffer_size < (sample_count << 1))
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{
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delete[] msu::resample_buffer;
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msu::resample_buffer = new uint8[sample_count << 1];
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msu::resample_buffer_size = sample_count << 1;
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}
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if (Settings.Mute)
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{
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memset(dest, 0, sample_count << 1);
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spc::resampler->clear();
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if(Settings.MSU1)
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msu::resampler->clear();
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return (FALSE);
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}
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else
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{
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if (spc::resampler->avail() >= (sample_count + spc::lag))
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{
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spc::resampler->read((short *) dest, sample_count);
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if (spc::lag == spc::lag_master)
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spc::lag = 0;
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if (Settings.MSU1)
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{
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if (msu::resampler->avail() >= sample_count)
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{
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msu::resampler->read((short *)msu::resample_buffer, sample_count);
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for (int i = 0; i < sample_count; ++i)
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*((int16*)(dest+(i * 2))) += *((int16*)(msu::resample_buffer +(i * 2)));
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}
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else // should never occur
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assert(0);
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}
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}
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else
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{
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memset(buffer, (Settings.SixteenBitSound ? 0 : 128), (sample_count << (Settings.SixteenBitSound ? 1 : 0)) >> (Settings.Stereo ? 0 : 1));
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if (spc::lag == 0)
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spc::lag = spc::lag_master;
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return (FALSE);
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}
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}
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if (Settings.ReverseStereo && Settings.Stereo)
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ReverseStereo(dest, sample_count);
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if (!Settings.Stereo || !Settings.SixteenBitSound)
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{
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if (!Settings.Stereo)
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{
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DeStereo(dest, sample_count);
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sample_count >>= 1;
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}
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if (!Settings.SixteenBitSound)
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EightBitize(dest, sample_count);
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memcpy(buffer, dest, (sample_count << (Settings.SixteenBitSound ? 1 : 0)));
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}
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return (TRUE);
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}
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int S9xGetSampleCount (void)
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{
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return (spc::resampler->avail() >> (Settings.Stereo ? 0 : 1));
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}
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/* TODO: Attach */
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void S9xFinalizeSamples (void)
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{
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bool drop_current_msu1_samples = true;
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if (!Settings.Mute)
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{
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drop_current_msu1_samples = false;
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if (!spc::resampler->push((short *)spc::landing_buffer, SNES::dsp.spc_dsp.sample_count()))
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{
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/* We weren't able to process the entire buffer. Potential overrun. */
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spc::sound_in_sync = FALSE;
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if (Settings.SoundSync && !Settings.TurboMode)
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return;
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// since we drop the current dsp samples we also want to drop generated msu1 samples
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drop_current_msu1_samples = true;
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}
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}
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// only generate msu1 if we really consumed the dsp samples (sample_count() resets at end of function),
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// otherwise we will generate multiple times for the same samples - so this needs to be after all early
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// function returns
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if (Settings.MSU1)
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{
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// generate the same number of msu1 samples as dsp samples were generated
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S9xMSU1SetOutput((int16 *)msu::landing_buffer, msu::buffer_size);
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S9xMSU1Generate(SNES::dsp.spc_dsp.sample_count());
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if (!drop_current_msu1_samples && !msu::resampler->push((short *)msu::landing_buffer, S9xMSU1Samples()))
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{
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// should not occur, msu buffer is larger and we drop msu samples if spc buffer overruns
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assert(0);
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}
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}
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if (!Settings.SoundSync || Settings.TurboMode || Settings.Mute)
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spc::sound_in_sync = TRUE;
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else
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if (spc::resampler->space_empty() >= spc::resampler->space_filled())
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spc::sound_in_sync = TRUE;
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else
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spc::sound_in_sync = FALSE;
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SNES::dsp.spc_dsp.set_output((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size);
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}
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void S9xLandSamples (void)
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{
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if (spc::sa_callback != NULL)
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spc::sa_callback(spc::extra_data);
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else
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S9xFinalizeSamples();
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}
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void S9xClearSamples (void)
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{
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spc::resampler->clear();
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if (Settings.MSU1)
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msu::resampler->clear();
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spc::lag = spc::lag_master;
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}
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bool8 S9xSyncSound (void)
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{
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if (!Settings.SoundSync || spc::sound_in_sync)
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return (TRUE);
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S9xLandSamples();
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return (spc::sound_in_sync);
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}
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void S9xSetSamplesAvailableCallback (apu_callback callback, void *data)
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{
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spc::sa_callback = callback;
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spc::extra_data = data;
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}
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void S9xUpdateDynamicRate (int avail, int buffer_size)
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{
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spc::dynamic_rate_multiplier = 1.0 + (Settings.DynamicRateLimit * (buffer_size - 2 * avail)) /
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(double)(1000 * buffer_size);
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UpdatePlaybackRate();
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}
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static void UpdatePlaybackRate (void)
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{
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if (Settings.SoundInputRate == 0)
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Settings.SoundInputRate = APU_DEFAULT_INPUT_RATE;
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double time_ratio = (double) Settings.SoundInputRate * spc::timing_hack_numerator / (Settings.SoundPlaybackRate * spc::timing_hack_denominator);
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if (Settings.DynamicRateControl)
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{
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time_ratio *= spc::dynamic_rate_multiplier;
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}
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spc::resampler->time_ratio(time_ratio);
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if (Settings.MSU1)
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{
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time_ratio = (44100.0 / Settings.SoundPlaybackRate) * (Settings.SoundInputRate / 32040.0);
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msu::resampler->time_ratio(time_ratio);
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}
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}
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bool8 S9xInitSound (int buffer_ms, int lag_ms)
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{
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// buffer_ms : buffer size given in millisecond
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// lag_ms : allowable time-lag given in millisecond
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int sample_count = buffer_ms * 32040 / 1000;
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int lag_sample_count = lag_ms * 32040 / 1000;
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spc::lag_master = lag_sample_count;
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if (Settings.Stereo)
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spc::lag_master <<= 1;
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spc::lag = spc::lag_master;
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if (sample_count < APU_MINIMUM_SAMPLE_COUNT)
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sample_count = APU_MINIMUM_SAMPLE_COUNT;
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spc::buffer_size = sample_count << 2;
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msu::buffer_size = (int)((sample_count << 2) * 1.5); // Always 16-bit, Stereo; 1.5 to never overflow before dsp buffer
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printf("Sound buffer size: %d (%d samples)\n", spc::buffer_size, sample_count);
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if (spc::landing_buffer)
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delete[] spc::landing_buffer;
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spc::landing_buffer = new uint8[spc::buffer_size * 2];
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if (!spc::landing_buffer)
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return (FALSE);
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if (msu::landing_buffer)
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delete[] msu::landing_buffer;
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msu::landing_buffer = new uint8[msu::buffer_size * 2];
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if (!msu::landing_buffer)
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return (FALSE);
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/* The resampler and spc unit use samples (16-bit short) as
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arguments. Use 2x in the resampler for buffer leveling with SoundSync */
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if (!spc::resampler)
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{
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spc::resampler = new HermiteResampler(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
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if (!spc::resampler)
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{
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delete[] spc::landing_buffer;
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return (FALSE);
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}
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}
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else
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spc::resampler->resize(spc::buffer_size >> (Settings.SoundSync ? 0 : 1));
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if (!msu::resampler)
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{
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msu::resampler = new HermiteResampler(msu::buffer_size);
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if (!msu::resampler)
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{
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delete[] msu::landing_buffer;
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return (FALSE);
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}
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}
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else
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msu::resampler->resize(msu::buffer_size);
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SNES::dsp.spc_dsp.set_output ((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size);
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UpdatePlaybackRate();
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spc::sound_enabled = S9xOpenSoundDevice();
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return (spc::sound_enabled);
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}
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void S9xSetSoundControl (uint8 voice_switch)
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{
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SNES::dsp.spc_dsp.set_stereo_switch (voice_switch << 8 | voice_switch);
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}
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void S9xSetSoundMute (bool8 mute)
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{
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Settings.Mute = mute;
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if (!spc::sound_enabled)
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Settings.Mute = TRUE;
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}
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void S9xDumpSPCSnapshot (void)
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{
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SNES::dsp.spc_dsp.dump_spc_snapshot();
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}
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static void SPCSnapshotCallback (void)
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{
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S9xSPCDump(S9xGetFilenameInc((".spc"), SPC_DIR));
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printf("Dumped key-on triggered spc snapshot.\n");
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}
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bool8 S9xInitAPU (void)
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{
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spc::landing_buffer = NULL;
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spc::shrink_buffer = NULL;
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spc::resampler = NULL;
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msu::resampler = NULL;
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return (TRUE);
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}
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void S9xDeinitAPU (void)
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{
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if (spc::resampler)
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{
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delete spc::resampler;
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spc::resampler = NULL;
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}
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if (spc::landing_buffer)
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{
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delete[] spc::landing_buffer;
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spc::landing_buffer = NULL;
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}
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if (spc::shrink_buffer)
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{
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delete[] spc::shrink_buffer;
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spc::shrink_buffer = NULL;
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}
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if (msu::resampler)
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{
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delete msu::resampler;
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msu::resampler = NULL;
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}
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if (msu::landing_buffer)
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{
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delete[] msu::landing_buffer;
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msu::landing_buffer = NULL;
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}
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if (msu::resample_buffer)
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{
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delete[] msu::resample_buffer;
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msu::resample_buffer = NULL;
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}
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S9xMSU1DeInit();
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}
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static inline int S9xAPUGetClock (int32 cpucycles)
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{
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return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) /
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spc::ratio_denominator;
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}
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static inline int S9xAPUGetClockRemainder (int32 cpucycles)
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{
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return (spc::ratio_numerator * (cpucycles - spc::reference_time) + spc::remainder) %
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spc::ratio_denominator;
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}
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uint8 S9xAPUReadPort (int port)
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{
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S9xAPUExecute ();
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return ((uint8) SNES::smp.port_read (port & 3));
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}
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void S9xAPUWritePort (int port, uint8 byte)
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{
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S9xAPUExecute ();
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SNES::cpu.port_write (port & 3, byte);
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}
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void S9xAPUSetReferenceTime (int32 cpucycles)
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{
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spc::reference_time = cpucycles;
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}
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void S9xAPUExecute (void)
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{
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SNES::smp.clock -= S9xAPUGetClock (CPU.Cycles);
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SNES::smp.enter ();
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spc::remainder = S9xAPUGetClockRemainder(CPU.Cycles);
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S9xAPUSetReferenceTime(CPU.Cycles);
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}
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void S9xAPUEndScanline (void)
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{
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S9xAPUExecute();
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SNES::dsp.synchronize();
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if (SNES::dsp.spc_dsp.sample_count() >= APU_MINIMUM_SAMPLE_BLOCK || !spc::sound_in_sync)
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S9xLandSamples();
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}
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void S9xAPUTimingSetSpeedup (int ticks)
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{
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if (ticks != 0)
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printf("APU speedup hack: %d\n", ticks);
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spc::timing_hack_denominator = 256 - ticks;
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spc::ratio_numerator = Settings.PAL ? APU_NUMERATOR_PAL : APU_NUMERATOR_NTSC;
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spc::ratio_denominator = Settings.PAL ? APU_DENOMINATOR_PAL : APU_DENOMINATOR_NTSC;
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spc::ratio_denominator = spc::ratio_denominator * spc::timing_hack_denominator / spc::timing_hack_numerator;
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UpdatePlaybackRate();
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}
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void S9xResetAPU (void)
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{
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spc::reference_time = 0;
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spc::remainder = 0;
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SNES::cpu.reset ();
|
|
SNES::cpu.frequency = Settings.PAL ? PAL_MASTER_CLOCK : NTSC_MASTER_CLOCK;
|
|
SNES::smp.power ();
|
|
SNES::dsp.power ();
|
|
SNES::dsp.spc_dsp.set_output ((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
|
|
SNES::dsp.spc_dsp.set_spc_snapshot_callback(SPCSnapshotCallback);
|
|
|
|
spc::resampler->clear();
|
|
|
|
if (Settings.MSU1)
|
|
msu::resampler->clear();
|
|
}
|
|
|
|
void S9xSoftResetAPU (void)
|
|
{
|
|
spc::reference_time = 0;
|
|
spc::remainder = 0;
|
|
SNES::cpu.reset ();
|
|
SNES::smp.reset ();
|
|
SNES::dsp.reset ();
|
|
SNES::dsp.spc_dsp.set_output ((SNES::SPC_DSP::sample_t *) spc::landing_buffer, spc::buffer_size >> 1);
|
|
|
|
spc::resampler->clear();
|
|
|
|
if (Settings.MSU1)
|
|
msu::resampler->clear();
|
|
}
|
|
|
|
void S9xAPUSaveState (uint8 *block)
|
|
{
|
|
uint8 *ptr = block;
|
|
|
|
SNES::smp.save_state (&ptr);
|
|
SNES::dsp.save_state (&ptr);
|
|
|
|
SNES::set_le32(ptr, spc::reference_time);
|
|
ptr += sizeof(int32);
|
|
SNES::set_le32(ptr, spc::remainder);
|
|
ptr += sizeof(int32);
|
|
SNES::set_le32(ptr, SNES::dsp.clock);
|
|
ptr += sizeof(int32);
|
|
memcpy (ptr, SNES::cpu.registers, 4);
|
|
ptr += sizeof(int32);
|
|
|
|
memset (ptr, 0, SPC_SAVE_STATE_BLOCK_SIZE-(ptr-block));
|
|
}
|
|
|
|
void S9xAPULoadState (uint8 *block)
|
|
{
|
|
uint8 *ptr = block;
|
|
|
|
SNES::smp.load_state (&ptr);
|
|
SNES::dsp.load_state (&ptr);
|
|
|
|
spc::reference_time = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
spc::remainder = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
SNES::dsp.clock = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
memcpy (SNES::cpu.registers, ptr, 4);
|
|
}
|
|
|
|
static void to_var_from_buf (uint8 **buf, void *var, size_t size)
|
|
{
|
|
memcpy(var, *buf, size);
|
|
*buf += size;
|
|
}
|
|
|
|
#undef IF_0_THEN_256
|
|
#define IF_0_THEN_256( n ) ((uint8) ((n) - 1) + 1)
|
|
void S9xAPULoadBlarggState(uint8 *oldblock)
|
|
{
|
|
uint8 *ptr = oldblock;
|
|
|
|
SNES::SPC_State_Copier copier(&ptr,to_var_from_buf);
|
|
|
|
copier.copy(SNES::smp.apuram,0x10000); // RAM
|
|
|
|
uint8 regs_in [0x10];
|
|
uint8 regs [0x10];
|
|
uint16 pc, spc_time, dsp_time;
|
|
uint8 a,x,y,psw,sp;
|
|
|
|
copier.copy(regs,0x10); // REGS
|
|
copier.copy(regs_in,0x10); // REGS_IN
|
|
|
|
// CPU Regs
|
|
pc = copier.copy_int( 0, sizeof(uint16) );
|
|
a = copier.copy_int( 0, sizeof(uint8) );
|
|
x = copier.copy_int( 0, sizeof(uint8) );
|
|
y = copier.copy_int( 0, sizeof(uint8) );
|
|
psw = copier.copy_int( 0, sizeof(uint8) );
|
|
sp = copier.copy_int( 0, sizeof(uint8) );
|
|
copier.extra();
|
|
|
|
// times
|
|
spc_time = copier.copy_int( 0, sizeof(uint16) );
|
|
dsp_time = copier.copy_int( 0, sizeof(uint16) );
|
|
|
|
int cur_time = S9xAPUGetClock(CPU.Cycles);
|
|
|
|
// spc_time is absolute, dsp_time is relative
|
|
// smp.clock is relative, dsp.clock relative but counting upwards
|
|
SNES::smp.clock = spc_time - cur_time;
|
|
SNES::dsp.clock = -1 * dsp_time;
|
|
|
|
// DSP
|
|
SNES::dsp.load_state(&ptr);
|
|
|
|
// Timers
|
|
uint16 next_time[3];
|
|
uint8 divider[3], counter[3];
|
|
for ( int i = 0; i < 3; i++ )
|
|
{
|
|
next_time[i] = copier.copy_int( 0, sizeof(uint16) );
|
|
divider[i] = copier.copy_int( 0, sizeof(uint8) );
|
|
counter[i] = copier.copy_int( 0, sizeof(uint8) );
|
|
copier.extra();
|
|
}
|
|
// construct timers out of available parts from blargg smp
|
|
SNES::smp.timer0.enable = regs[1] >> 0 & 1; // regs[1] = CONTROL
|
|
SNES::smp.timer0.target = IF_0_THEN_256(regs[10]); // regs[10+i] = TiTARGET
|
|
// blargg counts time, get ticks through timer frequency
|
|
// (assume tempo = 256)
|
|
SNES::smp.timer0.stage1_ticks = 128 - (next_time[0] - cur_time) / 128;
|
|
SNES::smp.timer0.stage2_ticks = divider[0];
|
|
SNES::smp.timer0.stage3_ticks = counter[0];
|
|
|
|
SNES::smp.timer1.enable = regs[1] >> 1 & 1;
|
|
SNES::smp.timer1.target = IF_0_THEN_256(regs[11]);
|
|
SNES::smp.timer1.stage1_ticks = 128 - (next_time[1] - cur_time) / 128;
|
|
SNES::smp.timer1.stage2_ticks = divider[0];
|
|
SNES::smp.timer1.stage3_ticks = counter[0];
|
|
|
|
SNES::smp.timer2.enable = regs[1] >> 2 & 1;
|
|
SNES::smp.timer2.target = IF_0_THEN_256(regs[12]);
|
|
SNES::smp.timer2.stage1_ticks = 16 - (next_time[2] - cur_time) / 16;
|
|
SNES::smp.timer2.stage2_ticks = divider[0];
|
|
SNES::smp.timer2.stage3_ticks = counter[0];
|
|
|
|
copier.extra();
|
|
|
|
SNES::smp.opcode_number = 0;
|
|
SNES::smp.opcode_cycle = 0;
|
|
|
|
SNES::smp.regs.pc = pc;
|
|
SNES::smp.regs.sp = sp;
|
|
SNES::smp.regs.B.a = a;
|
|
SNES::smp.regs.x = x;
|
|
SNES::smp.regs.B.y = y;
|
|
|
|
// blargg's psw has same layout as byuu's flags
|
|
SNES::smp.regs.p = psw;
|
|
|
|
// blargg doesn't explicitly store iplrom_enable
|
|
SNES::smp.status.iplrom_enable = regs[1] & 0x80;
|
|
|
|
SNES::smp.status.dsp_addr = regs[2];
|
|
|
|
SNES::smp.status.ram00f8 = regs_in[8];
|
|
SNES::smp.status.ram00f9 = regs_in[9];
|
|
|
|
// default to 0 - we are on an opcode boundary, shouldn't matter
|
|
SNES::smp.rd=SNES::smp.wr=SNES::smp.dp=SNES::smp.sp=SNES::smp.ya=SNES::smp.bit=0;
|
|
|
|
spc::reference_time = SNES::get_le32(ptr);
|
|
ptr += sizeof(int32);
|
|
spc::remainder = SNES::get_le32(ptr);
|
|
|
|
// blargg stores CPUIx in regs_in
|
|
memcpy (SNES::cpu.registers, regs_in + 4, 4);
|
|
}
|
|
|
|
bool8 S9xSPCDump (const char *filename)
|
|
{
|
|
FILE *fs;
|
|
uint8 buf[SPC_FILE_SIZE];
|
|
size_t ignore;
|
|
|
|
fs = fopen(filename, "wb");
|
|
if (!fs)
|
|
return (FALSE);
|
|
|
|
S9xSetSoundMute(TRUE);
|
|
|
|
SNES::smp.save_spc (buf);
|
|
|
|
ignore = fwrite (buf, SPC_FILE_SIZE, 1, fs);
|
|
|
|
if (ignore == 0)
|
|
{
|
|
fprintf (stderr, "Couldn't write file %s.\n", filename);
|
|
}
|
|
|
|
fclose(fs);
|
|
|
|
S9xSetSoundMute(FALSE);
|
|
|
|
return (TRUE);
|
|
}
|