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-rw-r--r--hw/gusemu_mixer.c240
1 files changed, 0 insertions, 240 deletions
diff --git a/hw/gusemu_mixer.c b/hw/gusemu_mixer.c
deleted file mode 100644
index 816c58a7ed..0000000000
--- a/hw/gusemu_mixer.c
+++ /dev/null
@@ -1,240 +0,0 @@
-/*
- * GUSEMU32 - mixing engine (similar to Interwave GF1 compatibility)
- *
- * Copyright (C) 2000-2007 Tibor "TS" Schütz
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "hw/gusemu.h"
-#include "hw/gustate.h"
-
-#define GUSregb(position) (* (gusptr+(position)))
-#define GUSregw(position) (*(GUSword *) (gusptr+(position)))
-#define GUSregd(position) (*(GUSdword *)(gusptr+(position)))
-
-#define GUSvoice(position) (*(GUSword *)(voiceptr+(position)))
-
-/* samples are always 16bit stereo (4 bytes each, first right then left interleaved) */
-void gus_mixvoices(GUSEmuState * state, unsigned int playback_freq, unsigned int numsamples,
- GUSsample *bufferpos)
-{
- /* note that byte registers are stored in the upper half of each voice register! */
- GUSbyte *gusptr;
- int Voice;
- GUSword *voiceptr;
-
- unsigned int count;
- for (count = 0; count < numsamples * 2; count++)
- *(bufferpos + count) = 0; /* clear */
-
- gusptr = state->gusdatapos;
- voiceptr = (GUSword *) gusptr;
- if (!(GUSregb(GUS4cReset) & 0x01)) /* reset flag active? */
- return;
-
- for (Voice = 0; Voice <= (GUSregb(NumVoices) & 31); Voice++)
- {
- if (GUSvoice(wVSRControl) & 0x200)
- GUSvoice(wVSRControl) |= 0x100; /* voice stop request */
- if (GUSvoice(wVSRVolRampControl) & 0x200)
- GUSvoice(wVSRVolRampControl) |= 0x100; /* Volume ramp stop request */
- if (!(GUSvoice(wVSRControl) & GUSvoice(wVSRVolRampControl) & 0x100)) /* neither voice nor volume calculation active - save some time here ;) */
- {
- unsigned int sample;
-
- unsigned int LoopStart = (GUSvoice(wVSRLoopStartHi) << 16) | GUSvoice(wVSRLoopStartLo); /* 23.9 format */
- unsigned int LoopEnd = (GUSvoice(wVSRLoopEndHi) << 16) | GUSvoice(wVSRLoopEndLo); /* 23.9 format */
- unsigned int CurrPos = (GUSvoice(wVSRCurrPosHi) << 16) | GUSvoice(wVSRCurrPosLo); /* 23.9 format */
- int VoiceIncrement = ((((unsigned long) GUSvoice(wVSRFreq) * 44100) / playback_freq) * (14 >> 1)) /
- ((GUSregb(NumVoices) & 31) + 1); /* 6.10 increment/frame to 23.9 increment/sample */
-
- int PanningPos = (GUSvoice(wVSRPanning) >> 8) & 0xf;
-
- unsigned int Volume32 = 32 * GUSvoice(wVSRCurrVol); /* 32 times larger than original gus for maintaining precision while ramping */
- unsigned int StartVol32 = (GUSvoice(wVSRVolRampStartVol) & 0xff00) * 32;
- unsigned int EndVol32 = (GUSvoice(wVSRVolRampEndVol) & 0xff00) * 32;
- int VolumeIncrement32 = (32 * 16 * (GUSvoice(wVSRVolRampRate) & 0x3f00) >> 8) >> ((((GUSvoice(wVSRVolRampRate) & 0xc000) >> 8) >> 6) * 3); /* including 1/8/64/512 volume speed divisor */
- VolumeIncrement32 = (((VolumeIncrement32 * 44100 / 2) / playback_freq) * 14) / ((GUSregb(NumVoices) & 31) + 1); /* adjust ramping speed to playback speed */
-
- if (GUSvoice(wVSRControl) & 0x4000)
- VoiceIncrement = -VoiceIncrement; /* reverse playback */
- if (GUSvoice(wVSRVolRampControl) & 0x4000)
- VolumeIncrement32 = -VolumeIncrement32; /* reverse ramping */
-
- for (sample = 0; sample < numsamples; sample++)
- {
- int sample1, sample2, Volume;
- if (GUSvoice(wVSRControl) & 0x400) /* 16bit */
- {
- int offset = ((CurrPos >> 9) & 0xc0000) + (((CurrPos >> 9) & 0x1ffff) << 1);
- GUSchar *adr;
- adr = (GUSchar *) state->himemaddr + offset;
- sample1 = (*adr & 0xff) + (*(adr + 1) * 256);
- sample2 = (*(adr + 2) & 0xff) + (*(adr + 2 + 1) * 256);
- }
- else /* 8bit */
- {
- int offset = (CurrPos >> 9) & 0xfffff;
- GUSchar *adr;
- adr = (GUSchar *) state->himemaddr + offset;
- sample1 = (*adr) * 256;
- sample2 = (*(adr + 1)) * 256;
- }
-
- Volume = ((((Volume32 >> (4 + 5)) & 0xff) + 256) << (Volume32 >> ((4 + 8) + 5))) / 512; /* semi-logarithmic volume, +5 due to additional precision */
- sample1 = (((sample1 * Volume) >> 16) * (512 - (CurrPos % 512))) / 512;
- sample2 = (((sample2 * Volume) >> 16) * (CurrPos % 512)) / 512;
- sample1 += sample2;
-
- if (!(GUSvoice(wVSRVolRampControl) & 0x100))
- {
- Volume32 += VolumeIncrement32;
- if ((GUSvoice(wVSRVolRampControl) & 0x4000) ? (Volume32 <= StartVol32) : (Volume32 >= EndVol32)) /* ramp up boundary cross */
- {
- if (GUSvoice(wVSRVolRampControl) & 0x2000)
- GUSvoice(wVSRVolRampControl) |= 0x8000; /* volramp IRQ enabled? -> IRQ wait flag */
- if (GUSvoice(wVSRVolRampControl) & 0x800) /* loop enabled */
- {
- if (GUSvoice(wVSRVolRampControl) & 0x1000) /* bidir. loop */
- {
- GUSvoice(wVSRVolRampControl) ^= 0x4000; /* toggle dir */
- VolumeIncrement32 = -VolumeIncrement32;
- }
- else
- Volume32 = (GUSvoice(wVSRVolRampControl) & 0x4000) ? EndVol32 : StartVol32; /* unidir. loop ramp */
- }
- else
- {
- GUSvoice(wVSRVolRampControl) |= 0x100;
- Volume32 =
- (GUSvoice(wVSRVolRampControl) & 0x4000) ? StartVol32 : EndVol32;
- }
- }
- }
- if ((GUSvoice(wVSRVolRampControl) & 0xa000) == 0xa000) /* volramp IRQ set and enabled? */
- {
- GUSregd(voicevolrampirq) |= 1 << Voice; /* set irq slot */
- }
- else
- {
- GUSregd(voicevolrampirq) &= (~(1 << Voice)); /* clear irq slot */
- GUSvoice(wVSRVolRampControl) &= 0x7f00;
- }
-
- if (!(GUSvoice(wVSRControl) & 0x100))
- {
- CurrPos += VoiceIncrement;
- if ((GUSvoice(wVSRControl) & 0x4000) ? (CurrPos <= LoopStart) : (CurrPos >= LoopEnd)) /* playback boundary cross */
- {
- if (GUSvoice(wVSRControl) & 0x2000)
- GUSvoice(wVSRControl) |= 0x8000; /* voice IRQ enabled -> IRQ wait flag */
- if (GUSvoice(wVSRControl) & 0x800) /* loop enabled */
- {
- if (GUSvoice(wVSRControl) & 0x1000) /* pingpong loop */
- {
- GUSvoice(wVSRControl) ^= 0x4000; /* toggle dir */
- VoiceIncrement = -VoiceIncrement;
- }
- else
- CurrPos = (GUSvoice(wVSRControl) & 0x4000) ? LoopEnd : LoopStart; /* unidir. loop */
- }
- else if (!(GUSvoice(wVSRVolRampControl) & 0x400))
- GUSvoice(wVSRControl) |= 0x100; /* loop disabled, rollover check */
- }
- }
- if ((GUSvoice(wVSRControl) & 0xa000) == 0xa000) /* wavetable IRQ set and enabled? */
- {
- GUSregd(voicewavetableirq) |= 1 << Voice; /* set irq slot */
- }
- else
- {
- GUSregd(voicewavetableirq) &= (~(1 << Voice)); /* clear irq slot */
- GUSvoice(wVSRControl) &= 0x7f00;
- }
-
- /* mix samples into buffer */
- *(bufferpos + 2 * sample) += (GUSsample) ((sample1 * PanningPos) >> 4); /* right */
- *(bufferpos + 2 * sample + 1) += (GUSsample) ((sample1 * (15 - PanningPos)) >> 4); /* left */
- }
- /* write back voice and volume */
- GUSvoice(wVSRCurrVol) = Volume32 / 32;
- GUSvoice(wVSRCurrPosHi) = CurrPos >> 16;
- GUSvoice(wVSRCurrPosLo) = CurrPos & 0xffff;
- }
- voiceptr += 16; /* next voice */
- }
-}
-
-void gus_irqgen(GUSEmuState * state, unsigned int elapsed_time)
-/* time given in microseconds */
-{
- int requestedIRQs = 0;
- GUSbyte *gusptr;
- gusptr = state->gusdatapos;
- if (GUSregb(TimerDataReg2x9) & 1) /* start timer 1 (80us decrement rate) */
- {
- unsigned int timer1fraction = state->timer1fraction;
- int newtimerirqs;
- newtimerirqs = (elapsed_time + timer1fraction) / (80 * (256 - GUSregb(GUS46Counter1)));
- state->timer1fraction = (elapsed_time + timer1fraction) % (80 * (256 - GUSregb(GUS46Counter1)));
- if (newtimerirqs)
- {
- if (!(GUSregb(TimerDataReg2x9) & 0x40))
- GUSregb(TimerStatus2x8) |= 0xc0; /* maskable bits */
- if (GUSregb(GUS45TimerCtrl) & 4) /* timer1 irq enable */
- {
- GUSregb(TimerStatus2x8) |= 4; /* nonmaskable bit */
- GUSregb(IRQStatReg2x6) |= 4; /* timer 1 irq pending */
- GUSregw(TimerIRQs) += newtimerirqs;
- requestedIRQs += newtimerirqs;
- }
- }
- }
- if (GUSregb(TimerDataReg2x9) & 2) /* start timer 2 (320us decrement rate) */
- {
- unsigned int timer2fraction = state->timer2fraction;
- int newtimerirqs;
- newtimerirqs = (elapsed_time + timer2fraction) / (320 * (256 - GUSregb(GUS47Counter2)));
- state->timer2fraction = (elapsed_time + timer2fraction) % (320 * (256 - GUSregb(GUS47Counter2)));
- if (newtimerirqs)
- {
- if (!(GUSregb(TimerDataReg2x9) & 0x20))
- GUSregb(TimerStatus2x8) |= 0xa0; /* maskable bits */
- if (GUSregb(GUS45TimerCtrl) & 8) /* timer2 irq enable */
- {
- GUSregb(TimerStatus2x8) |= 2; /* nonmaskable bit */
- GUSregb(IRQStatReg2x6) |= 8; /* timer 2 irq pending */
- GUSregw(TimerIRQs) += newtimerirqs;
- requestedIRQs += newtimerirqs;
- }
- }
- }
- if (GUSregb(GUS4cReset) & 0x4) /* synth IRQ enable */
- {
- if (GUSregd(voicewavetableirq))
- GUSregb(IRQStatReg2x6) |= 0x20;
- if (GUSregd(voicevolrampirq))
- GUSregb(IRQStatReg2x6) |= 0x40;
- }
- if ((!requestedIRQs) && GUSregb(IRQStatReg2x6))
- requestedIRQs++;
- if (GUSregb(IRQStatReg2x6))
- GUSregw(BusyTimerIRQs) = GUS_irqrequest(state, state->gusirq, requestedIRQs);
-}
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