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Use more efficient sorting for effect slots

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This commit is contained in:
Chris Robinson
2020-11-05 15:35:09 -08:00
parent aeb7170a8b
commit 26b03f534c
1 changed files with 46 additions and 36 deletions
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alc/alu.cpp
+46 -36
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@@ -1757,51 +1757,61 @@ void ProcessContexts(ALCdevice *device, const ALuint SamplesToDo)
auto slots = auxslots.data();
auto slots_end = slots + num_slots;
/* First sort the slots into extra storage, so that effects come
* before their effect target (or their targets' target).
/* Sort the slots into extra storage, so that effect slots come
* before their effect slot target (or their targets' target).
*/
auto sorted_slots = const_cast<ALeffectslot**>(slots_end);
auto sorted_slots_end = sorted_slots;
if(*sorted_slots)
const al::span<ALeffectslot*> sorted_slots{const_cast<ALeffectslot**>(slots_end),
num_slots};
/* Skip sorting if it has already been done. */
if(!sorted_slots[0])
{
/* Skip sorting if it has already been done. */
sorted_slots_end += num_slots;
goto skip_sorting;
}
*sorted_slots_end = *slots;
++sorted_slots_end;
while(++slots != slots_end)
{
auto in_chain = [](const ALeffectslot *s1, const ALeffectslot *s2) noexcept -> bool
{
while((s1=s1->Params.Target) != nullptr) {
if(s1 == s2) return true;
}
return false;
};
/* If this effect slot targets an effect slot already in the
* list (i.e. slots outputs to something in sorted_slots),
* directly or indirectly, insert it prior to that element.
/* First, copy the slots to the sorted list, then partition the
* sorted list so that all slots without a target slot go to
* the end.
*/
auto checker = sorted_slots;
do {
if(in_chain(*slots, *checker)) break;
} while(++checker != sorted_slots_end);
std::copy(slots, slots_end, sorted_slots.begin());
auto split_point = std::partition(sorted_slots.begin(), sorted_slots.end(),
[](const ALeffectslot *slot) noexcept -> bool
{ return slot->Params.Target != nullptr; });
/* There must be at least one slot without a slot target. */
assert(split_point != sorted_slots.end());
checker = std::move_backward(checker, sorted_slots_end, sorted_slots_end+1);
*--checker = *slots;
++sorted_slots_end;
/* Simple case: no more than 1 slot has a target slot. Either
* all slots go right to the output, or the remaining one must
* target an already-partitioned slot.
*/
if(split_point - sorted_slots.begin() > 1)
{
/* At least two slots target other slots. Starting from the
* back of the sorted list, continue partitioning the front
* of the list given each target until all targets are
* accounted for. This ensures all slots without a target
* go last, all slots directly targeting those last slots
* go second-to-last, all slots directly targeting those
* second-last slots go third-to-last, etc.
*/
auto next_target = sorted_slots.end();
do {
/* This shouldn't happen, but if there's unsorted slots
* left that don't target any sorted slots, they can't
* contribute to the output, so leave them.
*/
if UNLIKELY(next_target == split_point)
break;
--next_target;
split_point = std::partition(sorted_slots.begin(), split_point,
[next_target](const ALeffectslot *slot) noexcept -> bool
{ return slot->Params.Target != *next_target; });
} while(split_point - sorted_slots.begin() > 1);
}
}
skip_sorting:
auto process_effect = [SamplesToDo](const ALeffectslot *slot) -> void
for(const ALeffectslot *slot : sorted_slots)
{
EffectState *state{slot->Params.mEffectState};
state->process(SamplesToDo, slot->Wet.Buffer, state->mOutTarget);
};
std::for_each(sorted_slots, sorted_slots_end, process_effect);
}
}
/* Signal the event handler if there are any events to read. */