private ParticleSpatializer.NeighborhoodResults BuildSwarmerNeighborhoods()
{
TypedComputeBuffer <SpatializerShaderParticlePosition> scratchParticlePositionsBuffer =
particleSpatializer.GetScratchParticlePositionsComputeBuffer(SwarmerCount);
// Extract the swarmer positions so the spatializer can stay generic.
{
CommonSwarmComputeShader.SetInt("u_swarmer_count", SwarmerCount);
CommonSwarmComputeShader.SetBuffer(
kernelForExtractSwarmerPositions,
"u_readable_swarmers",
swarmerStateBuffers.CurrentComputeBuffer);
CommonSwarmComputeShader.SetBuffer(
kernelForExtractSwarmerPositions,
"u_out_swarmer_positions",
scratchParticlePositionsBuffer);
ComputeShaderHelpers.DispatchLinearComputeShader(
CommonSwarmComputeShader,
kernelForExtractSwarmerPositions,
SwarmerCount);
}
ParticleSpatializer.NeighborhoodResults result =
particleSpatializer.BuildNeighborhoodLookupBuffers(
SwarmerCount,
scratchParticlePositionsBuffer,
SwarmerNeighborhoodRadius);
return(result);
}
public TypedComputeBuffer <SwarmShaderSwarmerState> TryBuildSwarmersForRenderFrameIndex(
int frameIndex)
{
// If the swarm needs to be advanced to the requested frame.
if ((BehaviorComputeShader != null) &&
(lastRenderedFrameIndex != frameIndex) &&
particleSpatializer.IsInitialized)
{
DateTime currentTime = DateTime.UtcNow;
bool applicationIsPaused =
#if UNITY_EDITOR
EditorApplication.isPaused;
#else
false;
#endif
// The editor doesn't alter the timescale for us when the sim is paused, so we need to do it ourselves.
float timeScale = (
LocalTimeScale *
(applicationIsPaused ? 0.0f : Time.timeScale));
// Step ourselves based on the *graphics* framerate (since we're part of the rendering pipeline),
// but make sure to avoid giant steps whenever rendering is paused.
float localDeltaTime =
Mathf.Min(
(float)(timeScale * (currentTime - lastRenderedDateTime).TotalSeconds),
Time.maximumDeltaTime);
ParticleSpatializer.NeighborhoodResults swarmerNeighborhoods = BuildSwarmerNeighborhoods();
audioShaderUniformCollector.CollectComputeShaderUniforms(BehaviorComputeShader);
AdvanceSwarmers(localDeltaTime, swarmerNeighborhoods);
lastRenderedFrameIndex = frameIndex;
lastRenderedDateTime = currentTime;
}
return(swarmerStateBuffers.CurrentComputeBuffer);
}
private void AdvanceSwarmers(
float localDeltaTime,
ParticleSpatializer.NeighborhoodResults swarmerNeighborhoods)
{
// Bind the swarmers.
{
BehaviorComputeShader.SetInt("u_swarmer_count", SwarmerCount);
swarmerStateBuffers.SwapBuffersAndBindToShaderKernel(
BehaviorComputeShader,
advanceSwarmersKernel,
"u_readable_swarmers",
"u_out_next_swarmers");
}
// Bind the spatialization results.
{
BehaviorComputeShader.SetInt("u_voxel_count_per_axis", particleSpatializer.VoxelsPerAxis);
BehaviorComputeShader.SetInt("u_total_voxel_count", particleSpatializer.TotalVoxelCount);
BehaviorComputeShader.SetBuffer(advanceSwarmersKernel, "u_spatialization_voxel_particle_pairs", swarmerNeighborhoods.VoxelParticlePairsBuffer);
BehaviorComputeShader.SetBuffer(advanceSwarmersKernel, "u_spatialization_voxels", swarmerNeighborhoods.SpatializationVoxelsBuffer);
BehaviorComputeShader.SetBuffer(advanceSwarmersKernel, "u_spatialization_neighborhoods", swarmerNeighborhoods.NeighborhoodsBuffer);
}
// Bind the forcefields.
{
TypedComputeBuffer <SwarmShaderForcefieldState> forcefieldsComputeBuffer;
int activeForcefieldCount;
BuildForcefieldsBuffer(
out forcefieldsComputeBuffer,
out activeForcefieldCount);
BehaviorComputeShader.SetInt("u_forcefield_count", activeForcefieldCount);
BehaviorComputeShader.SetBuffer(advanceSwarmersKernel, "u_forcefields", forcefieldsComputeBuffer);
}
// Bind behavior/advancement constants.
{
BehaviorComputeShader.SetFloat("u_neighborhood_radius", SwarmerNeighborhoodRadius);
BehaviorComputeShader.SetInt("u_max_neighbor_count", MaxNeighborCount);
BehaviorComputeShader.SetFloat("u_swarmer_speed_min", SwarmerSpeedMin);
BehaviorComputeShader.SetFloat("u_swarmer_speed_idle", SwarmerSpeedIdle);
BehaviorComputeShader.SetFloat("u_swarmer_speed_max", SwarmerSpeedMax);
BehaviorComputeShader.SetFloat("u_swarmer_speed_blending_rate", SwarmerSpeedBlendingRate);
BehaviorComputeShader.SetFloat("u_swarmer_steering_yaw_rate", SteeringYawRate);
BehaviorComputeShader.SetFloat("u_swarmer_steering_pitch_rate", SteeringPitchRate);
BehaviorComputeShader.SetFloat("u_swarmer_steering_roll_rate", SteeringRollRate);
BehaviorComputeShader.SetFloat("u_swarmer_steering_roll_uprighting_scalar", SteeringRollUprightingScalar);
BehaviorComputeShader.SetFloat("u_swarmer_swim_upwards_blending_rate", SwimAnimation.UpwardsBlendingRate);
BehaviorComputeShader.SetFloat("u_swarmer_swim_downwards_blending_rate", SwimAnimation.DownwardsBlendingRate);
BehaviorComputeShader.SetFloat("u_swarmer_swim_idle_amplitude", SwimAnimation.IdleAmplitude);
BehaviorComputeShader.SetFloat("u_swarmer_swim_idle_rate", SwimAnimation.IdleRate);
BehaviorComputeShader.SetFloat("u_swarmer_swim_bursting_max_accel_input", SwimAnimation.BurstingMaxAccelInput);
BehaviorComputeShader.SetFloat("u_swarmer_swim_bursting_amplitude", SwimAnimation.BurstingAmplitude);
BehaviorComputeShader.SetFloat("u_swarmer_swim_bursting_rate", SwimAnimation.BurstingRate);
BehaviorComputeShader.SetFloat("u_swarmer_swim_center_counter_rotation_amplitude_fraction", SwimAnimation.CenterCounterRotationAmplitudeFraction);
BehaviorComputeShader.SetVector("u_swarmer_swim_center_counter_rotation_pivot_point", SwimAnimation.CenterCounterRotationPivotPoint);
BehaviorComputeShader.SetVector("u_swarmer_swim_center_counter_rotation_pivot_axis", SwimAnimation.CenterCounterRotationPivotAxis);
BehaviorComputeShader.SetFloat("u_neighbor_attraction_scalar", NeighborAttractionScalar);
BehaviorComputeShader.SetFloat("u_neighbor_collision_avoidance_scalar", NeighborCollisionAvoidanceScalar);
BehaviorComputeShader.SetFloat("u_neighbor_alignment_scalar", NeighborAlignmentScalar);
BehaviorComputeShader.SetFloat("u_swarmer_model_scale", SwarmerModelScale);
BehaviorComputeShader.SetVector("u_swarmer_model_left_segment_pivot_point", swarmerModel.SwarmerLeftSegmentPivotPoint);
BehaviorComputeShader.SetVector("u_swarmer_model_left_segment_pivot_axis", swarmerModel.SwarmerLeftSegmentPivotAxis);
BehaviorComputeShader.SetVector("u_swarmer_model_right_segment_pivot_point", swarmerModel.SwarmerRightSegmentPivotPoint);
BehaviorComputeShader.SetVector("u_swarmer_model_right_segment_pivot_axis", swarmerModel.SwarmerRightSegmentPivotAxis);
BehaviorComputeShader.SetFloat("u_swarmer_segment_pitch_effect_scalar", SegmentPitchEffectScalar);
BehaviorComputeShader.SetFloat("u_swarmer_segment_roll_effect_scalar", SegmentRollEffectScalar);
BehaviorComputeShader.SetFloat("u_swarmer_segment_max_angle_magnitude", (SegmentMaxAngleMagnitude * Mathf.Deg2Rad));
BehaviorComputeShader.SetFloat("u_swarmer_segment_angle_blending_rate", SegmentAngleBlendingRate);
BehaviorComputeShader.SetFloat("u_delta_time", localDeltaTime);
}
ComputeShaderHelpers.DispatchLinearComputeShader(
BehaviorComputeShader,
advanceSwarmersKernel,
swarmerStateBuffers.ElementCount);
}
