Method discEmitter

cpp/5_Domain_Specific/smokeParticles/ParticleSystem.cpp:295–328

particle emitters

// particle emitters
void ParticleSystem::discEmitter(uint &index,
                                 vec3f pos,
                                 vec3f vel,
                                 vec3f vx,
                                 vec3f vy,
                                 float r,
                                 int   n,
                                 float lifetime,
                                 float lifetimeVariance)
{
    float4 *posPtr = m_pos.getHostPtr();
    float4 *velPtr = m_vel.getHostPtr();

    uint start = index;
    uint count = 0;

    for (int i = 0; i < n; i++) {
        vec2f delta = randCircle() * r;

        if (index < m_numParticles) {
            vec3f p  = pos + delta.x * vx + delta.y * vy;
            float lt = lifetime + frand() * lifetimeVariance;

            posPtr[index] = make_float4(p.x, p.y, p.z, 0.0f);
            velPtr[index] = make_float4(vel.x, vel.y, vel.z, lt);

            index++;
            count++;
        }
    }

    m_pos.copy(GpuArray<float4>::HOST_TO_DEVICE, start, count);
    m_vel.copy(GpuArray<float4>::HOST_TO_DEVICE, start, count);
}

void ParticleSystem::sphereEmitter(uint &index,
                                   vec3f pos,