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backend-infra-engineer: Pre-0.2.2 2024 Q2 snapshot

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scawful
2024-04-14 15:49:57 -05:00
parent 546093360f
commit 92cc574e15
113 changed files with 5631 additions and 1872 deletions
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32
src/app/emu/audio/dsp.h
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@@ -10,12 +10,12 @@
namespace yaze {
namespace app {
namespace emu {
namespace audio {
using SampleFetcher = std::function<uint8_t(uint16_t)>;
using SamplePusher = std::function<void(int16_t)>;
/**
*
* The S-DSP is a digital signal processor generating the sound data.
*
* A DSP register can be selected with $F2, after which it can be read or
@@ -34,21 +34,19 @@ using SamplePusher = std::function<void(int16_t)>;
* There are 8 voices, numbered 0 to 7.
* Each voice X has 10 registers in the range $X0-$X9.
*
* Name Address Bits Notes
* VOL (L) $X0 SVVV VVVV Left channel volume, signed.
* VOL (R) $X1 SVVV VVVV Right channel volume, signed.
* P (L) $X2 LLLL LLLL Low 8 bits of sample pitch.
* P (H) $X3 --HH HHHH High 6 bits of sample pitch.
* SCRN $X4 SSSS SSSS Selects a sample source entry from the
* directory ADSR (1) $X5 EDDD AAAA ADSR enable (E), decay rate (D),
* attack rate (A).
* ADSR (2) $X6 SSSR RRRR Sustain level (S), release rate (R).
* GAIN $X7 0VVV VVVV 1MMV VVVV Mode (M), value (V).
* ENVX $X8 0VVV VVVV Reads current 7-bit value of ADSR/GAIN
* envelope.
* OUTX $X9 SVVV VVVV Reads signed 8-bit value of current
* sample wave multiplied by ENVX, before applying VOL.
*
* | Name | Address | Bits | Notes |
* |---------|---------|-----------|--------------------------------------------------------|
* | VOL (L) | $X0 | SVVV VVVV | Left channel volume, signed. |
* | VOL (R) | $X1 | SVVV VVVV | Right channel volume, signed. |
* | P (L) | $X2 | LLLL LLLL | Low 8 bits of sample pitch. |
* | P (H) | $X3 | --HH HHHH | High 6 bits of sample pitch. |
* | SCRN | $X4 | SSSS SSSS | Selects a sample source entry from the directory. |
* | ADSR (1)| $X5 | EDDD AAAA | ADSR enable (E), decay rate (D), attack rate (A). |
* | ADSR (2)| $X6 | SSSR RRRR | Sustain level (S), release rate (R). |
* | GAIN | $X7 | 0VVV VVVV 1MMV VVVV | Mode (M), value (V). |
* | ENVX | $X8 | 0VVV VVVV | Reads current 7-bit value of ADSR/GAIN envelope. |
* | OUTX | $X9 | SVVV VVVV | Reads signed 8-bit value of current sample wave |
* | | | | multiplied by ENVX, before applying VOL. |
*/
class DigitalSignalProcessor {
@@ -308,6 +306,8 @@ class DigitalSignalProcessor {
// and apply the envelope to the audio output.
void process_envelope(uint8_t voice_num);
};
} // namespace audio
} // namespace emu
} // namespace app
} // namespace yaze