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adsr: Add state helper functions

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Add helper functions that report back whether the ADSR generator is in a
given state.  Namely, if it is "waiting" for a trigger, or it is idle.
This commit is contained in:
Stuart Longland 2017-07-15 15:19:54 +10:00
parent aeefd70fe3
commit 7039dd1307
Signed by: stuartl
GPG Key ID: F954BBBB7948D546
1 changed files with 16 additions and 0 deletions
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16
adsr.h
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@ -135,6 +135,22 @@ static inline uint8_t adsr_is_done(struct adsr_env_gen_t* const adsr) {
return (adsr->state == ADSR_STATE_DONE);
}
/*!
* Test to see if the ADSR is awaiting a trigger.
*/
static inline uint8_t adsr_is_waiting(struct adsr_env_gen_t* const adsr) {
return ((adsr->next_event == UINT32_MAX)
&& ((adsr->state == ADSR_STATE_DELAY_EXPIRE)
|| (adsr->state == ADSR_STATE_SUSTAIN_EXPIRE)));
}
/*!
* Test to see if the ADSR is idle.
*/
static inline uint8_t adsr_is_idle(struct adsr_env_gen_t* const adsr) {
return (adsr->state == ADSR_STATE_IDLE);
}
/*!
* Tell the ADSR to move onto the next state.
*/