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gt913: fix single-driver build, fix invalid Unicode character. [R. Belmont]

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This commit is contained in:
arbee 2021-12-14 11:26:27 -05:00
parent 852b1f3d26
commit a3ba70ad14
2 changed files with 11 additions and 9 deletions
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4
scripts/src/machine.lua
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@ -1427,7 +1427,9 @@ end
---------------------------------------------------
--
--@src/devices/machine/gt913.h,MACHINES["GT913"] = true
--@src/devices/machine/gt913_io.h,MACHINES["GT913"] = true
--@src/devices/machine/gt913_kbd.h,MACHINES["GT913"] = true
--@src/devices/machine/gt913_snd.h,MACHINES["GT913"] = true
---------------------------------------------------
if (MACHINES["GT913"]~=null) then

16
src/devices/machine/gt913_snd.cpp
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@ -8,13 +8,13 @@
which is then input to either a serial DAC or a HG51B-based DSP,
depending on the model of keyboard.
The sample format, as well as other details such as the linear interpolation,
are covered in these two Japanese patents:
https://patents.google.com/patent/JP3603343B2/en
https://patents.google.com/patent/JPH07199996A/en
The sample format, as well as other details such as the linear interpolation,
are covered in these two Japanese patents:
https://patents.google.com/patent/JP3603343B2/en
https://patents.google.com/patent/JPH07199996A/en
TODO: Volume envelope rates still need adjusting.
(See comment in gt913_sound_device::command_w regarding command 6007)
TODO: Volume envelope rates still need adjusting.
(See comment in gt913_sound_device::command_w regarding command 6007)
***************************************************************************/
@ -142,7 +142,7 @@ void gt913_sound_device::mix_sample(voice_t& voice, s64& left, s64& right)
const u8 env = (voice.m_volume_current >> 24);
/*
the current envelope level effects amplitude non-linearly, just apply the value twice
(this hardware family is branded as "A² (A-Square) Sound Source" in some of Casio's
(this hardware family is branded as "A<EFBFBD> (A-Square) Sound Source" in some of Casio's
promotional materials, possibly for this reason?)
*/
const s64 sample = ((s64)voice.m_sample + (voice.m_sample_next * step / 8)) * voice.m_gain * env * env;
@ -164,7 +164,7 @@ void gt913_sound_device::update_sample(voice_t& voice)
so once we've reached that point, use those values to reload the current sample and exponent
*/
const u32 addr_loop_data = (voice.m_addr_end + 1) & ~1;
voice.m_sample_next = read_word(addr_loop_data) - voice.m_sample;
voice.m_exp = read_word(addr_loop_data + 10) & 7;
}