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#include "actions.hpp"
#include "BLI_hash.h"
namespace BParticles {
void ActionSequence::execute(ParticleActionContext &context)
{
for (auto &action : m_actions) {
action->execute(context);
}
}
static void update_position_and_velocity_offsets(ParticleActionContext &context)
{
auto *offsets_context = context.try_find<ParticleIntegratedOffsets>();
auto *remaining_times_context = context.try_find<ParticleRemainingTimeInStep>();
if (offsets_context == nullptr || remaining_times_context == nullptr) {
return;
}
AttributesRef attributes = context.attributes();
MutableAttributesRef attribute_offsets = offsets_context->offsets;
ArrayRef<float> remaining_times = remaining_times_context->remaining_times;
auto velocities = attributes.get<float3>("Velocity");
auto position_offsets = attribute_offsets.try_get<float3>("Position");
auto velocity_offsets = attribute_offsets.try_get<float3>("Velocity");
for (uint pindex : context.mask()) {
float3 velocity = velocities[pindex];
if (position_offsets.has_value()) {
position_offsets.value()[pindex] = velocity * remaining_times[pindex];
}
if (velocity_offsets.has_value()) {
velocity_offsets.value()[pindex] = float3(0);
}
}
}
void ConditionAction::execute(ParticleActionContext &context)
{
ParticleFunctionEvaluator inputs{m_inputs_fn, context.mask(), context.attributes()};
inputs.context_builder().set_buffer_cache(context.buffer_cache());
inputs.compute();
Vector<uint> true_pindices, false_pindices;
for (uint pindex : context.mask()) {
if (inputs.get_single<bool>("Condition", 0, pindex)) {
true_pindices.append(pindex);
}
else {
false_pindices.append(pindex);
}
}
m_true_action.execute_for_subset(true_pindices.as_ref(), context);
m_false_action.execute_for_subset(false_pindices.as_ref(), context);
}
void SetAttributeAction::execute(ParticleActionContext &context)
{
Optional<GenericMutableArrayRef> attribute_opt = context.attributes().try_get(m_attribute_name,
m_attribute_type);
if (!attribute_opt.has_value()) {
return;
}
GenericMutableArrayRef attribute = *attribute_opt;
ParticleFunctionEvaluator inputs{m_inputs_fn, context.mask(), context.attributes()};
inputs.context_builder().set_buffer_cache(context.buffer_cache());
inputs.compute();
for (uint pindex : context.mask()) {
const void *value = inputs.get_single("Value", 0, pindex);
void *dst = attribute[pindex];
m_attribute_type.copy_to_initialized(value, dst);
}
if (m_attribute_name == "Velocity") {
update_position_and_velocity_offsets(context);
}
}
using FN::MFDataType;
using FN::MFParamType;
void SpawnParticlesAction::execute(ParticleActionContext &context)
{
if (context.mask().size() == 0) {
return;
}
auto *current_time_context = context.try_find<ParticleCurrentTimesContext>();
if (current_time_context == nullptr) {
return;
}
ArrayRef<float> current_times = current_time_context->current_times;
uint array_size = context.mask().min_array_size();
ParticleFunctionEvaluator inputs{m_spawn_function, context.mask(), context.attributes()};
inputs.context_builder().set_buffer_cache(context.buffer_cache());
inputs.compute();
Array<int> particle_counts(array_size, -1);
const MultiFunction &fn = m_spawn_function.fn();
for (uint param_index : fn.param_indices()) {
MFParamType param_type = fn.param_type(param_index);
if (param_type.is_vector_output()) {
FN::GenericVectorArray &vector_array = inputs.computed_vector_array(param_index);
for (uint i : context.mask()) {
FN::GenericArrayRef array = vector_array[i];
particle_counts[i] = std::max<int>(particle_counts[i], array.size());
}
}
}
for (uint i : context.mask()) {
if (particle_counts[i] == -1) {
particle_counts[i] = 1;
}
}
uint total_spawn_amount = 0;
for (uint i : context.mask()) {
total_spawn_amount += particle_counts[i];
}
StringMap<GenericMutableArrayRef> attribute_arrays;
Vector<float> new_birth_times;
for (uint i : context.mask()) {
new_birth_times.append_n_times(current_times[i], particle_counts[i]);
}
attribute_arrays.add_new("Birth Time", new_birth_times.as_mutable_ref());
for (uint param_index : fn.param_indices()) {
MFParamType param_type = fn.param_type(param_index);
MFDataType data_type = param_type.data_type();
StringRef attribute_name = m_attribute_names[param_index];
switch (data_type.category()) {
case MFDataType::Single: {
const FN::CPPType &type = data_type.single__cpp_type();
void *buffer = MEM_malloc_arrayN(total_spawn_amount, type.size(), __func__);
GenericMutableArrayRef array(type, buffer, total_spawn_amount);
GenericArrayRef computed_array = inputs.computed_array(param_index);
uint current = 0;
for (uint i : context.mask()) {
uint amount = particle_counts[i];
array.slice(current, amount).fill__uninitialized(computed_array[i]);
current += amount;
}
attribute_arrays.add(attribute_name, array);
break;
}
case MFDataType::Vector: {
const FN::CPPType &base_type = data_type.vector__cpp_base_type();
void *buffer = MEM_malloc_arrayN(total_spawn_amount, base_type.size(), __func__);
GenericMutableArrayRef array(base_type, buffer, total_spawn_amount);
FN::GenericVectorArray &computed_vector_array = inputs.computed_vector_array(param_index);
uint current = 0;
for (uint pindex : context.mask()) {
uint amount = particle_counts[pindex];
GenericMutableArrayRef array_slice = array.slice(current, amount);
GenericArrayRef computed_array = computed_vector_array[pindex];
if (computed_array.size() == 0) {
const void *default_buffer = context.attributes().info().default_of(attribute_name);
array_slice.fill__uninitialized(default_buffer);
}
else if (computed_array.size() == amount) {
base_type.copy_to_uninitialized_n(
computed_array.buffer(), array_slice.buffer(), amount);
}
else {
for (uint i : IndexRange(amount)) {
base_type.copy_to_uninitialized(computed_array[i % computed_array.size()],
array_slice[i]);
}
}
current += amount;
}
attribute_arrays.add(attribute_name, array);
break;
}
}
}
for (StringRef system_name : m_systems_to_emit) {
auto new_particles = context.particle_allocator().request(system_name, total_spawn_amount);
attribute_arrays.foreach_item([&](StringRef attribute_name, GenericMutableArrayRef array) {
if (new_particles.info().has_attribute(attribute_name, array.type())) {
new_particles.set(attribute_name, array);
}
});
m_action.execute_for_new_particles(new_particles, context);
}
attribute_arrays.foreach_item([&](StringRef attribute_name, GenericMutableArrayRef array) {
if (attribute_name != "Birth Time") {
array.destruct_indices(context.mask());
MEM_freeN(array.buffer());
}
});
}
} // namespace BParticles
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