Mercurial > repos > blastem
annotate cdd_fader.c @ 2208:3809a0bd680e
Fix a couple of Z80 debugger issues
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 27 Aug 2022 22:02:09 -0700 |
| parents | 4fbe1e7c4a73 |
| children | 5a21bc0ec583 |
| rev | line source |
|---|---|
| 2080 | 1 #include "cdd_fader.h" |
| 2 #include <stdio.h> | |
| 3 | |
| 4 void cdd_fader_init(cdd_fader *fader) | |
| 5 { | |
|
2081
cfd53c94fffb
Initial stab at RF5C164 emulation
Michael Pavone <pavone@retrodev.com>
parents:
2080
diff
changeset
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6 fader->audio = render_audio_source("CDDA", 16934400, 384, 2); |
| 2080 | 7 fader->cur_attenuation = 0x4000; |
| 8 fader->dst_attenuation = 0x4000; | |
| 9 fader->attenuation_step = 0; | |
| 10 } | |
|
2164
4fbe1e7c4a73
Don't leak all Sega CD resources when freeing a Genesis instance
Michael Pavone <pavone@retrodev.com>
parents:
2081
diff
changeset
|
11 |
|
4fbe1e7c4a73
Don't leak all Sega CD resources when freeing a Genesis instance
Michael Pavone <pavone@retrodev.com>
parents:
2081
diff
changeset
|
12 void cdd_fader_deinit(cdd_fader *fader) |
|
4fbe1e7c4a73
Don't leak all Sega CD resources when freeing a Genesis instance
Michael Pavone <pavone@retrodev.com>
parents:
2081
diff
changeset
|
13 { |
|
4fbe1e7c4a73
Don't leak all Sega CD resources when freeing a Genesis instance
Michael Pavone <pavone@retrodev.com>
parents:
2081
diff
changeset
|
14 render_free_source(fader->audio); |
|
4fbe1e7c4a73
Don't leak all Sega CD resources when freeing a Genesis instance
Michael Pavone <pavone@retrodev.com>
parents:
2081
diff
changeset
|
15 } |
|
4fbe1e7c4a73
Don't leak all Sega CD resources when freeing a Genesis instance
Michael Pavone <pavone@retrodev.com>
parents:
2081
diff
changeset
|
16 |
| 2080 | 17 void cdd_fader_attenuation_write(cdd_fader *fader, uint16_t attenuation) |
| 18 { | |
| 19 fader->dst_attenuation = attenuation & 0xFFF0; | |
| 20 fader->flags = attenuation & 0xE; | |
| 21 if (fader->dst_attenuation > fader->cur_attenuation) { | |
| 22 fader->attenuation_step = (fader->dst_attenuation - fader->cur_attenuation) >> 4; | |
| 23 } else if (fader->dst_attenuation < fader->cur_attenuation) { | |
| 24 fader->attenuation_step = (fader->cur_attenuation - fader->dst_attenuation) >> 4; | |
| 25 } else { | |
| 26 fader->attenuation_step = 0; | |
| 27 } | |
| 28 } | |
| 29 | |
| 30 void cdd_fader_data(cdd_fader *fader, uint8_t byte) | |
| 31 { | |
| 32 fader->bytes[fader->byte_counter++] = byte; | |
| 33 if (fader->byte_counter == sizeof(fader->bytes)) { | |
| 34 fader->byte_counter = 0; | |
| 35 int32_t left = (fader->bytes[1] << 8) | fader->bytes[0]; | |
| 36 int32_t right = (fader->bytes[3] << 8) | fader->bytes[2]; | |
| 37 if (left & 0x8000) { | |
| 38 left |= 0xFFFF0000; | |
| 39 } | |
| 40 if (right & 0x8000) { | |
| 41 right |= 0xFFFF0000; | |
| 42 } | |
| 43 if (!fader->cur_attenuation) { | |
| 44 left = right = 0; | |
| 45 } else if (fader->cur_attenuation >= 4) { | |
| 46 left *= fader->cur_attenuation & 0x7FF0; | |
| 47 right *= fader->cur_attenuation & 0x7FF0; | |
| 48 left >>= 14; | |
| 49 right >>= 14; | |
| 50 } else { | |
| 51 //TODO: FIXME | |
| 52 left = right = 0; | |
| 53 } | |
| 54 render_put_stereo_sample(fader->audio, left, right); | |
| 55 if (fader->attenuation_step) { | |
| 56 if (fader->dst_attenuation > fader->cur_attenuation) { | |
| 57 fader->cur_attenuation += fader->attenuation_step; | |
| 58 if (fader->cur_attenuation >= fader->dst_attenuation) { | |
| 59 fader->cur_attenuation = fader->dst_attenuation; | |
| 60 fader->attenuation_step = 0; | |
| 61 } | |
| 62 } else { | |
| 63 fader->cur_attenuation -= fader->attenuation_step; | |
| 64 if (fader->cur_attenuation <= fader->dst_attenuation) { | |
| 65 fader->cur_attenuation = fader->dst_attenuation; | |
| 66 fader->attenuation_step = 0; | |
| 67 } | |
| 68 } | |
| 69 } | |
| 70 } | |
| 71 } |