diff options
| -rw-r--r-- | scene/2d/cpu_particles_2d.cpp | 15 | ||||
| -rw-r--r-- | scene/3d/cpu_particles.cpp | 15 |
2 files changed, 22 insertions, 8 deletions
diff --git a/scene/2d/cpu_particles_2d.cpp b/scene/2d/cpu_particles_2d.cpp index f021665f38..2b1009a2d1 100644 --- a/scene/2d/cpu_particles_2d.cpp +++ b/scene/2d/cpu_particles_2d.cpp @@ -545,6 +545,8 @@ void CPUParticles2D::_particles_process(float p_delta) { velocity_xform[2] = Vector2(); } + float system_phase = time / lifetime; + for (int i = 0; i < pcount; i++) { Particle &p = parray[i]; @@ -552,21 +554,26 @@ void CPUParticles2D::_particles_process(float p_delta) { if (!emitting && !p.active) continue; - float restart_time = (float(i) / float(pcount)) * lifetime; float local_delta = p_delta; + // The phase is a ratio between 0 (birth) and 1 (end of life) for each particle. + // While we use time in tests later on, for randomness we use the phase as done in the + // original shader code, and we later multiply by lifetime to get the time. + float restart_phase = float(i) / float(pcount); + if (randomness_ratio > 0.0) { uint32_t seed = cycle; - if (restart_time >= time) { + if (restart_phase >= system_phase) { seed -= uint32_t(1); } seed *= uint32_t(pcount); seed += uint32_t(i); float random = float(idhash(seed) % uint32_t(65536)) / 65536.0; - restart_time += randomness_ratio * random * 1.0 / float(pcount); + restart_phase += randomness_ratio * random * 1.0 / float(pcount); } - restart_time *= (1.0 - explosiveness_ratio); + restart_phase *= (1.0 - explosiveness_ratio); + float restart_time = restart_phase * lifetime; bool restart = false; if (time > prev_time) { diff --git a/scene/3d/cpu_particles.cpp b/scene/3d/cpu_particles.cpp index 1f2cb9a2bc..a81071492b 100644 --- a/scene/3d/cpu_particles.cpp +++ b/scene/3d/cpu_particles.cpp @@ -515,6 +515,8 @@ void CPUParticles::_particles_process(float p_delta) { velocity_xform = emission_xform.basis; } + float system_phase = time / lifetime; + for (int i = 0; i < pcount; i++) { Particle &p = parray[i]; @@ -522,21 +524,26 @@ void CPUParticles::_particles_process(float p_delta) { if (!emitting && !p.active) continue; - float restart_time = (float(i) / float(pcount)) * lifetime; float local_delta = p_delta; + // The phase is a ratio between 0 (birth) and 1 (end of life) for each particle. + // While we use time in tests later on, for randomness we use the phase as done in the + // original shader code, and we later multiply by lifetime to get the time. + float restart_phase = float(i) / float(pcount); + if (randomness_ratio > 0.0) { uint32_t seed = cycle; - if (restart_time >= time) { + if (restart_phase >= system_phase) { seed -= uint32_t(1); } seed *= uint32_t(pcount); seed += uint32_t(i); float random = float(idhash(seed) % uint32_t(65536)) / 65536.0; - restart_time += randomness_ratio * random * 1.0 / float(pcount); + restart_phase += randomness_ratio * random * 1.0 / float(pcount); } - restart_time *= (1.0 - explosiveness_ratio); + restart_phase *= (1.0 - explosiveness_ratio); + float restart_time = restart_phase * lifetime; bool restart = false; if (time > prev_time) { |