Method PreSim

Source/Engine/Particles/Graph/GPU/GPUParticles.cpp:143–167

}

void GPUParticles::PreSim(GPUContext* context, ParticleEmitter* emitter, ParticleEffect* effect, int32 emitterIndex, ParticleEmitterInstance& data)
{
    uint32 counterDefaultValue = 0;
    const uint32 counterOffset = data.Buffer->GPU.ParticleCounterOffset;

    // Clear buffers if need to
    if (data.Buffer->GPU.PendingClear)
    {
        data.Buffer->GPU.PendingClear = false;
        data.Buffer->GPU.ParticlesCountMax = 0;

        // Clear counter in the particles buffer
        context->UpdateBuffer(data.Buffer->GPU.Buffer, &counterDefaultValue, sizeof(counterDefaultValue), counterOffset);

        // Clear custom data
        for (int32 i = 0; i < CustomDataSize; i += 4)
        {
            const uint32 offset = counterOffset + 4 + i * 4;
            context->UpdateBuffer(data.Buffer->GPU.Buffer, &counterDefaultValue, 4, offset);
        }
    }

    // Clear destination buffer counter
    context->UpdateBuffer(data.Buffer->GPU.BufferSecondary, &counterDefaultValue, sizeof(counterDefaultValue), counterOffset);
}

void GPUParticles::Sim(GPUContext* context, ParticleEmitter* emitter, ParticleEffect* effect, int32 emitterIndex, ParticleEmitterInstance& data)
{