PPC: e500: msync is 440 only, e500 has real sync
[qemu.git] / hw / gusemu_mixer.c
1 /*
2 * GUSEMU32 - mixing engine (similar to Interwave GF1 compatibility)
3 *
4 * Copyright (C) 2000-2007 Tibor "TS" Sch├╝tz
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "gusemu.h"
26 #include "gustate.h"
27
28 #define GUSregb(position) (* (gusptr+(position)))
29 #define GUSregw(position) (*(GUSword *) (gusptr+(position)))
30 #define GUSregd(position) (*(GUSdword *)(gusptr+(position)))
31
32 #define GUSvoice(position) (*(GUSword *)(voiceptr+(position)))
33
34 /* samples are always 16bit stereo (4 bytes each, first right then left interleaved) */
35 void gus_mixvoices(GUSEmuState * state, unsigned int playback_freq, unsigned int numsamples,
36 GUSsample *bufferpos)
37 {
38 /* note that byte registers are stored in the upper half of each voice register! */
39 GUSbyte *gusptr;
40 int Voice;
41 GUSword *voiceptr;
42
43 unsigned int count;
44 for (count = 0; count < numsamples * 2; count++)
45 *(bufferpos + count) = 0; /* clear */
46
47 gusptr = state->gusdatapos;
48 voiceptr = (GUSword *) gusptr;
49 if (!(GUSregb(GUS4cReset) & 0x01)) /* reset flag active? */
50 return;
51
52 for (Voice = 0; Voice <= (GUSregb(NumVoices) & 31); Voice++)
53 {
54 if (GUSvoice(wVSRControl) & 0x200)
55 GUSvoice(wVSRControl) |= 0x100; /* voice stop request */
56 if (GUSvoice(wVSRVolRampControl) & 0x200)
57 GUSvoice(wVSRVolRampControl) |= 0x100; /* Volume ramp stop request */
58 if (!(GUSvoice(wVSRControl) & GUSvoice(wVSRVolRampControl) & 0x100)) /* neither voice nor volume calculation active - save some time here ;) */
59 {
60 unsigned int sample;
61
62 unsigned int LoopStart = (GUSvoice(wVSRLoopStartHi) << 16) | GUSvoice(wVSRLoopStartLo); /* 23.9 format */
63 unsigned int LoopEnd = (GUSvoice(wVSRLoopEndHi) << 16) | GUSvoice(wVSRLoopEndLo); /* 23.9 format */
64 unsigned int CurrPos = (GUSvoice(wVSRCurrPosHi) << 16) | GUSvoice(wVSRCurrPosLo); /* 23.9 format */
65 int VoiceIncrement = ((((unsigned long) GUSvoice(wVSRFreq) * 44100) / playback_freq) * (14 >> 1)) /
66 ((GUSregb(NumVoices) & 31) + 1); /* 6.10 increment/frame to 23.9 increment/sample */
67
68 int PanningPos = (GUSvoice(wVSRPanning) >> 8) & 0xf;
69
70 unsigned int Volume32 = 32 * GUSvoice(wVSRCurrVol); /* 32 times larger than original gus for maintaining precision while ramping */
71 unsigned int StartVol32 = (GUSvoice(wVSRVolRampStartVol) & 0xff00) * 32;
72 unsigned int EndVol32 = (GUSvoice(wVSRVolRampEndVol) & 0xff00) * 32;
73 int VolumeIncrement32 = (32 * 16 * (GUSvoice(wVSRVolRampRate) & 0x3f00) >> 8) >> ((((GUSvoice(wVSRVolRampRate) & 0xc000) >> 8) >> 6) * 3); /* including 1/8/64/512 volume speed divisor */
74 VolumeIncrement32 = (((VolumeIncrement32 * 44100 / 2) / playback_freq) * 14) / ((GUSregb(NumVoices) & 31) + 1); /* adjust ramping speed to playback speed */
75
76 if (GUSvoice(wVSRControl) & 0x4000)
77 VoiceIncrement = -VoiceIncrement; /* reverse playback */
78 if (GUSvoice(wVSRVolRampControl) & 0x4000)
79 VolumeIncrement32 = -VolumeIncrement32; /* reverse ramping */
80
81 for (sample = 0; sample < numsamples; sample++)
82 {
83 int sample1, sample2, Volume;
84 if (GUSvoice(wVSRControl) & 0x400) /* 16bit */
85 {
86 int offset = ((CurrPos >> 9) & 0xc0000) + (((CurrPos >> 9) & 0x1ffff) << 1);
87 GUSchar *adr;
88 adr = (GUSchar *) state->himemaddr + offset;
89 sample1 = (*adr & 0xff) + (*(adr + 1) * 256);
90 sample2 = (*(adr + 2) & 0xff) + (*(adr + 2 + 1) * 256);
91 }
92 else /* 8bit */
93 {
94 int offset = (CurrPos >> 9) & 0xfffff;
95 GUSchar *adr;
96 adr = (GUSchar *) state->himemaddr + offset;
97 sample1 = (*adr) * 256;
98 sample2 = (*(adr + 1)) * 256;
99 }
100
101 Volume = ((((Volume32 >> (4 + 5)) & 0xff) + 256) << (Volume32 >> ((4 + 8) + 5))) / 512; /* semi-logarithmic volume, +5 due to additional precision */
102 sample1 = (((sample1 * Volume) >> 16) * (512 - (CurrPos % 512))) / 512;
103 sample2 = (((sample2 * Volume) >> 16) * (CurrPos % 512)) / 512;
104 sample1 += sample2;
105
106 if (!(GUSvoice(wVSRVolRampControl) & 0x100))
107 {
108 Volume32 += VolumeIncrement32;
109 if ((GUSvoice(wVSRVolRampControl) & 0x4000) ? (Volume32 <= StartVol32) : (Volume32 >= EndVol32)) /* ramp up boundary cross */
110 {
111 if (GUSvoice(wVSRVolRampControl) & 0x2000)
112 GUSvoice(wVSRVolRampControl) |= 0x8000; /* volramp IRQ enabled? -> IRQ wait flag */
113 if (GUSvoice(wVSRVolRampControl) & 0x800) /* loop enabled */
114 {
115 if (GUSvoice(wVSRVolRampControl) & 0x1000) /* bidir. loop */
116 {
117 GUSvoice(wVSRVolRampControl) ^= 0x4000; /* toggle dir */
118 VolumeIncrement32 = -VolumeIncrement32;
119 }
120 else
121 Volume32 = (GUSvoice(wVSRVolRampControl) & 0x4000) ? EndVol32 : StartVol32; /* unidir. loop ramp */
122 }
123 else
124 {
125 GUSvoice(wVSRVolRampControl) |= 0x100;
126 Volume32 =
127 (GUSvoice(wVSRVolRampControl) & 0x4000) ? StartVol32 : EndVol32;
128 }
129 }
130 }
131 if ((GUSvoice(wVSRVolRampControl) & 0xa000) == 0xa000) /* volramp IRQ set and enabled? */
132 {
133 GUSregd(voicevolrampirq) |= 1 << Voice; /* set irq slot */
134 }
135 else
136 {
137 GUSregd(voicevolrampirq) &= (~(1 << Voice)); /* clear irq slot */
138 GUSvoice(wVSRVolRampControl) &= 0x7f00;
139 }
140
141 if (!(GUSvoice(wVSRControl) & 0x100))
142 {
143 CurrPos += VoiceIncrement;
144 if ((GUSvoice(wVSRControl) & 0x4000) ? (CurrPos <= LoopStart) : (CurrPos >= LoopEnd)) /* playback boundary cross */
145 {
146 if (GUSvoice(wVSRControl) & 0x2000)
147 GUSvoice(wVSRControl) |= 0x8000; /* voice IRQ enabled -> IRQ wait flag */
148 if (GUSvoice(wVSRControl) & 0x800) /* loop enabled */
149 {
150 if (GUSvoice(wVSRControl) & 0x1000) /* pingpong loop */
151 {
152 GUSvoice(wVSRControl) ^= 0x4000; /* toggle dir */
153 VoiceIncrement = -VoiceIncrement;
154 }
155 else
156 CurrPos = (GUSvoice(wVSRControl) & 0x4000) ? LoopEnd : LoopStart; /* unidir. loop */
157 }
158 else if (!(GUSvoice(wVSRVolRampControl) & 0x400))
159 GUSvoice(wVSRControl) |= 0x100; /* loop disabled, rollover check */
160 }
161 }
162 if ((GUSvoice(wVSRControl) & 0xa000) == 0xa000) /* wavetable IRQ set and enabled? */
163 {
164 GUSregd(voicewavetableirq) |= 1 << Voice; /* set irq slot */
165 }
166 else
167 {
168 GUSregd(voicewavetableirq) &= (~(1 << Voice)); /* clear irq slot */
169 GUSvoice(wVSRControl) &= 0x7f00;
170 }
171
172 /* mix samples into buffer */
173 *(bufferpos + 2 * sample) += (GUSsample) ((sample1 * PanningPos) >> 4); /* right */
174 *(bufferpos + 2 * sample + 1) += (GUSsample) ((sample1 * (15 - PanningPos)) >> 4); /* left */
175 }
176 /* write back voice and volume */
177 GUSvoice(wVSRCurrVol) = Volume32 / 32;
178 GUSvoice(wVSRCurrPosHi) = CurrPos >> 16;
179 GUSvoice(wVSRCurrPosLo) = CurrPos & 0xffff;
180 }
181 voiceptr += 16; /* next voice */
182 }
183 }
184
185 void gus_irqgen(GUSEmuState * state, unsigned int elapsed_time)
186 /* time given in microseconds */
187 {
188 int requestedIRQs = 0;
189 GUSbyte *gusptr;
190 gusptr = state->gusdatapos;
191 if (GUSregb(TimerDataReg2x9) & 1) /* start timer 1 (80us decrement rate) */
192 {
193 unsigned int timer1fraction = state->timer1fraction;
194 int newtimerirqs;
195 newtimerirqs = (elapsed_time + timer1fraction) / (80 * (256 - GUSregb(GUS46Counter1)));
196 state->timer1fraction = (elapsed_time + timer1fraction) % (80 * (256 - GUSregb(GUS46Counter1)));
197 if (newtimerirqs)
198 {
199 if (!(GUSregb(TimerDataReg2x9) & 0x40))
200 GUSregb(TimerStatus2x8) |= 0xc0; /* maskable bits */
201 if (GUSregb(GUS45TimerCtrl) & 4) /* timer1 irq enable */
202 {
203 GUSregb(TimerStatus2x8) |= 4; /* nonmaskable bit */
204 GUSregb(IRQStatReg2x6) |= 4; /* timer 1 irq pending */
205 GUSregw(TimerIRQs) += newtimerirqs;
206 requestedIRQs += newtimerirqs;
207 }
208 }
209 }
210 if (GUSregb(TimerDataReg2x9) & 2) /* start timer 2 (320us decrement rate) */
211 {
212 unsigned int timer2fraction = state->timer2fraction;
213 int newtimerirqs;
214 newtimerirqs = (elapsed_time + timer2fraction) / (320 * (256 - GUSregb(GUS47Counter2)));
215 state->timer2fraction = (elapsed_time + timer2fraction) % (320 * (256 - GUSregb(GUS47Counter2)));
216 if (newtimerirqs)
217 {
218 if (!(GUSregb(TimerDataReg2x9) & 0x20))
219 GUSregb(TimerStatus2x8) |= 0xa0; /* maskable bits */
220 if (GUSregb(GUS45TimerCtrl) & 8) /* timer2 irq enable */
221 {
222 GUSregb(TimerStatus2x8) |= 2; /* nonmaskable bit */
223 GUSregb(IRQStatReg2x6) |= 8; /* timer 2 irq pending */
224 GUSregw(TimerIRQs) += newtimerirqs;
225 requestedIRQs += newtimerirqs;
226 }
227 }
228 }
229 if (GUSregb(GUS4cReset) & 0x4) /* synth IRQ enable */
230 {
231 if (GUSregd(voicewavetableirq))
232 GUSregb(IRQStatReg2x6) |= 0x20;
233 if (GUSregd(voicevolrampirq))
234 GUSregb(IRQStatReg2x6) |= 0x40;
235 }
236 if ((!requestedIRQs) && GUSregb(IRQStatReg2x6))
237 requestedIRQs++;
238 if (GUSregb(IRQStatReg2x6))
239 GUSregw(BusyTimerIRQs) = GUS_irqrequest(state, state->gusirq, requestedIRQs);
240 }