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optimizing fluid_voice_modulate() (#486)

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This avoids recalculation of the same generator when several modulators have that generator as destination.
This commit is contained in:
jjceresa 2018-12-19 14:07:34 +01:00 committed by Tom M
parent ef5739f3ce
commit b7af84fbd5
1 changed files with 31 additions and 32 deletions
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63
src/synth/fluid_voice.c
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@ -1162,24 +1162,23 @@ fluid_voice_update_param(fluid_voice_t *voice, int gen)
* iteration of the audio cycle (which would probably be feasible if
* the synth was made in silicon).
*
* The update is done in three steps:
* The update is done in two steps:
*
* - step 1: first, we look for all the modulators that have the changed
* controller as a source. This will yield a list of generators that
* will be changed because of the controller event.
* controller as a source. This will yield a generator that will be changed
* because of the controller event.
*
* - step 2: For every changed generator, calculate its new value. This is the
* - step 2: For this generator, calculate its new value. This is the
* sum of its original value plus the values of all the attached modulators.
* The generator flag is set to indicate the parameters must be updated.
*
* - step 3: We need to avoid the risk to call 'fluid_voice_update_param' several
* This avoid the risk to call 'fluid_voice_update_param' several
* times for the same generator if several modulators have that generator as
* destination. So every changed generators are updated only once
* destination. So every changed generators are updated only once.
*/
/* bit table for each generator being updated. The bits are packed in variables
Each variable have NBR_BIT_BY_VAR bits represented by NBR_BIT_BY_VAR_LN2.
The size of the table is the number of variables: SIZE_UPDATED_GEN.
The size of the table is the number of variables: SIZE_UPDATED_GEN_BIT.
Note: In this implementation NBR_BIT_BY_VAR_LN2 is set to 5 (convenient for 32 bits cpu)
but this could be set to 6 for 64 bits cpu.
@ -1200,7 +1199,7 @@ int fluid_voice_modulate(fluid_voice_t *voice, int cc, int ctrl)
uint32_t gen;
fluid_real_t modval;
/* registered bits table of updated generators */
/* Clears registered bits table of updated generators */
uint32_t updated_gen_bit[SIZE_UPDATED_GEN_BIT] = {0};
/* printf("Chan=%d, CC=%d, Src=%d, Val=%d\n", voice->channel->channum, cc, ctrl, val); */
@ -1210,36 +1209,36 @@ int fluid_voice_modulate(fluid_voice_t *voice, int cc, int ctrl)
mod = &voice->mod[i];
/* step 1: find all the modulators that have the changed controller
as input source. When ctrl is -1 all modulators's destination
as input source. When ctrl is -1 all modulators destination
are updated */
if(ctrl < 0 || fluid_mod_has_source(mod, cc, ctrl))
{
gen = fluid_mod_get_dest(mod);
modval = 0.0;
/* step 2: for every changed modulator, calculate the modulation
* value of its associated generator */
for(k = 0; k < voice->mod_count; k++)
/* Skip if this generator has already been updated */
if(!is_gen_updated(updated_gen_bit, gen))
{
if(fluid_mod_has_dest(&voice->mod[k], gen))
{
modval += fluid_mod_get_value(&voice->mod[k], voice);
}
}
modval = 0.0;
fluid_gen_set_mod(&voice->gen[gen], modval);
/* set the bit that indicates this generator is updated */
set_gen_updated(updated_gen_bit, gen);
}
}
/* step 3: now recalculate the parameter values that are derived from the
generator */
for(gen = 0; gen < GEN_LAST; gen++)
{
if (is_gen_updated(updated_gen_bit, gen))
{
fluid_voice_update_param(voice, gen);
/* step 2: for every attached modulator, calculate the modulation
* value for the generator gen */
for(k = 0; k < voice->mod_count; k++)
{
if(fluid_mod_has_dest(&voice->mod[k], gen))
{
modval += fluid_mod_get_value(&voice->mod[k], voice);
}
}
fluid_gen_set_mod(&voice->gen[gen], modval);
/* now recalculate the parameter values that are derived from the
generator */
fluid_voice_update_param(voice, gen);
/* set the bit that indicates this generator is updated */
set_gen_updated(updated_gen_bit, gen);
}
}
}