sparkles-effect-modifier.cpp
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/*
* Copyright (c) 2023 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "sparkles-effect-modifier.h"
#include "sparkles-effect-source.h"
namespace Dali::ParticleEffect
{
static float LIFETIME = 3.0f;
SparklesModifier::SparklesModifier(ParticleEmitter& emitter)
: mEmitter(emitter)
{
}
bool SparklesModifier::IsMultiThreaded()
{
return true;
}
void SparklesModifier::Update(ParticleList& particleList, uint32_t first, uint32_t count)
{
// If no acive particles return
if(!particleList.GetActiveParticleCount())
{
return;
}
mAngle = ((mAngle + 2) % 360);
// Retrieve the Source and get the stream
auto handle = mEmitter.GetHandle();
if(!handle)
{
return;
}
if(!mStreamBasePos)
{
mStreamBasePos = static_cast<SparklesSource*>(&handle.GetSource().GetSourceCallback())->mStreamBasePos;
}
if(!mStreamBaseAngle)
{
mStreamBaseAngle = static_cast<SparklesSource*>(&handle.GetSource().GetSourceCallback())->mStreamBaseAngle;
}
// Missing stream, return!
if(!mStreamBasePos)
{
return;
}
auto& activeParticles = particleList.GetActiveParticles();
auto it = activeParticles.begin();
std::advance(it, first);
for(; count; ++it, count--)
{
// Acquire stream data
auto& particle = *it;
auto& position = particle.Get<Vector3>(ParticleStream::POSITION_STREAM_BIT);
auto& velocity = particle.Get<Vector3>(ParticleStream::VELOCITY_STREAM_BIT);
auto& color = particle.Get<Vector4>(ParticleStream::COLOR_STREAM_BIT);
auto& scale = particle.Get<Vector3>(ParticleStream::SCALE_STREAM_BIT);
// Get base positions
[[maybe_unused]] auto& basePos = particle.GetByIndex<Vector3>(mStreamBasePos);
auto angle = particle.GetByIndex<float>(mStreamBaseAngle);
auto radians = ((angle * M_PI)/180.f);
float lifetime = particle.Get<float>(ParticleStream::LIFETIME_STREAM_BIT);
position.y += velocity.y * sin(radians);
position.x += velocity.x * cos(radians);
velocity *= 0.990f;
float normalizedTime = (lifetime / LIFETIME);
color.a = normalizedTime;
scale = Vector3(64.0f*(normalizedTime * normalizedTime * normalizedTime * normalizedTime), 64.0f*(normalizedTime * normalizedTime * normalizedTime * normalizedTime), 1.0);
}
}
}