unsafe int RunCPUBenchmark(peUpdateRoutine r, bool mt, string text)
{
IntPtr ctx = peCreateContext(BenchmarkParticleCount);
peParams p = default(peParams);
p.pressure_stiffness = m_pressure_stiffness;
p.wall_stiffness = m_wall_stiffness;
p.particle_size = m_particle_size;
p.update_velocity = Update_Velocity;
p.update_position = Update_Position;
p.routine = r;
p.multi_threading = mt;
peSetParams(ctx, ref p);
float elapsed_total = 0.0f;
int num_try = 0;
while (elapsed_total < BenchmarkTimeout)
{
float t = Time.realtimeSinceStartup;
peUpdate(ctx, BenchmarkDeltaTime);
elapsed_total += Time.realtimeSinceStartup - t;
++num_try;
}
peDestroyContext(ctx);
m_output.text = m_output.text + text + (elapsed_total / num_try * 1000.0f).ToString("0.0") + "ms\n";
return(0);
}
unsafe void Update()
{
if (Input.GetKeyDown(KeyCode.R))
{
ResetParticles();
}
if (Input.GetKeyDown(KeyCode.P))
{
m_pause = !m_pause;
}
if (m_pause)
{
return;
}
float t = Time.realtimeSinceStartup;
if (m_routine == peUpdateRoutine.ComputeShader)
{
Update_ComputeShader(Time.deltaTime);
}
else
{
peParams p = default(peParams);
p.routine = m_routine;
p.multi_threading = m_multi_threading;
p.pressure_stiffness = m_pressure_stiffness;
p.wall_stiffness = m_wall_stiffness;
p.particle_size = m_particle_size;
p.update_velocity = Update_Velocity;
p.update_position = Update_Position;
peSetParams(m_ctx, ref p);
peUpdate(m_ctx, Time.deltaTime);
}
m_update_time = Time.realtimeSinceStartup - t;
}
[DllImport("ParticleEngine")] public static extern void peSetParams(IntPtr ctx, ref peParams v);
public static extern void peSetParams(IntPtr ctx, ref peParams v);
static unsafe void Update_Velocity(peParams* p, float dt, int begin, int end)
{
peParticle* particles = p->particles;
float particle_size2 = p->particle_size * 2.0f;
float rcp_particle_size2 = 1.0f / (p->particle_size * 2.0f);
// パーティクル同士の押し返し
for (int i = begin; i < end; ++i) {
Vector3 pos1 = particles[i].position;
Vector3 accel = Vector3.zero;
for (int j = 0; j < p->particles_count; ++j) {
Vector3 pos2 = particles[j].position;
Vector3 diff = pos2 - pos1;
Vector3 dir = diff * rcp_particle_size2;
float dist = diff.magnitude;
if (dist > 0.0f) {
Vector3 a = dir * (Mathf.Min(0.0f, dist - particle_size2) * p->pressure_stiffness);
accel = accel + a;
}
}
Vector3 vel = particles[i].velocity;
vel = vel + accel * dt;
particles[i].velocity = vel;
}
// 床との衝突
Vector3 floor_normal = new Vector3(0.0f, 1.0f, 0.0f);
float floor_distance = -p->particle_size;
for (int i = begin; i < end; ++i) {
Vector3 pos = particles[i].position;
float d = Vector3.Dot(pos, floor_normal) + floor_distance;
Vector3 accel = floor_normal * (-Mathf.Min(0.0f, d) * p->wall_stiffness);
Vector3 vel = particles[i].velocity;
vel = vel + accel * dt;
particles[i].velocity = vel;
}
// 重力加速
Vector3 gravity_direction = new Vector3(0.0f, -1.0f, 0.0f);
float gravity_strength = 5.0f;
for (int i = begin; i < end; ++i) {
Vector3 accel = gravity_direction * gravity_strength;
Vector3 vel = particles[i].velocity;
vel = vel + accel * dt;
particles[i].velocity = vel;
}
}
static unsafe void Update_Position(peParams* p, float dt, int begin, int end)
{
peParticle* particles = p->particles;
for (int i = begin; i < end; ++i)
{
Vector3 pos = particles[i].position;
Vector3 vel = particles[i].velocity;
pos = pos + (vel * dt);
particles[i].position = pos;
}
}