1 files changed, 113 insertions, 0 deletions
diff --git a/Runtime/Graphics/ParticleSystem/ParticleSystemUtils.cpp b/Runtime/Graphics/ParticleSystem/ParticleSystemUtils.cpp
new file mode 100644
index 0000000..032cd19
--- /dev/null
+++ b/Runtime/Graphics/ParticleSystem/ParticleSystemUtils.cpp
@@ -0,0 +1,113 @@
+#include "UnityPrefix.h"
+#include "ParticleSystemUtils.h"
+#include "ParticleSystem.h"
+#include "ParticleSystemCurves.h"
+#include "Modules/ParticleSystemModule.h"
+#include "Runtime/BaseClasses/IsPlaying.h"
+
+#if UNITY_EDITOR
+#include "Editor/Src/ParticleSystem/ParticleSystemEditor.h"
+#endif
+
+UInt32 randomSeed = 0x1337;
+
+UInt32 GetGlobalRandomSeed ()
+{
+	return ++randomSeed;
+}
+
+void ResetGlobalRandomSeed ()
+{
+	randomSeed = 0x1337;
+}
+
+Vector2f CalculateInverseLerpOffsetScale (const Vector2f& range)
+{
+	Assert (range.x < range.y);
+	float scale = 1.0F / (range.y - range.x);
+	return Vector2f (scale, -range.x * scale);
+}
+
+void CalculatePositionAndVelocity(Vector3f& initialPosition, Vector3f& initialVelocity, const ParticleSystemReadOnlyState& roState, const ParticleSystemState& state, const ParticleSystemParticles& ps, const size_t index)
+{
+	initialPosition = ps.position[index];
+	initialVelocity = ps.velocity[index] + ps.animatedVelocity[index];
+	if(roState.useLocalSpace)
+	{
+		// If we are in local space, transform to world space to make independent of this emitters transform
+		initialPosition = state.localToWorld.MultiplyPoint3(initialPosition);
+		initialVelocity = state.localToWorld.MultiplyVector3(initialVelocity);
+	}
+}
+
+void KillParticle(const ParticleSystemReadOnlyState& roState, ParticleSystemState& state, ParticleSystemParticles& ps, size_t index, size_t& particleCount)
+{
+	Assert(particleCount > 0);
+
+	for(int i = 0; i < state.numCachedSubDataDeath; i++)
+	{
+		ParticleSystemEmissionState emissionState;
+		RecordEmit(emissionState, state.cachedSubDataDeath[i], roState, state, ps, kParticleSystemSubTypeDeath, i, index, 0.0f, 0.0001f, 1.0f);
+	}
+
+	ps.element_assign (index, particleCount - 1);
+	--particleCount;
+
+}
+
+void RecordEmit(ParticleSystemEmissionState& emissionState, const ParticleSystemSubEmitterData& subEmitterData, const ParticleSystemReadOnlyState& roState, ParticleSystemState& state, ParticleSystemParticles& ps, ParticleSystemSubType type, int subEmitterIndex, size_t particleIndex, float t, float dt, float length)
+{	
+	size_t numContinuous = 0;
+	Vector3f initialPosition;
+	Vector3f initialVelocity;
+	CalculatePositionAndVelocity(initialPosition, initialVelocity, roState, state, ps, particleIndex);
+	int amountOfParticlesToEmit = ParticleSystem::EmitFromData (emissionState, numContinuous, subEmitterData.emissionData, initialVelocity, t, std::min(t + dt, length), dt, length);
+	if(amountOfParticlesToEmit)
+	{
+		if(!state.recordSubEmits)
+			ParticleSystem::Emit(*subEmitterData.emitter, SubEmitterEmitCommand(emissionState, initialPosition, initialVelocity, type, subEmitterIndex, amountOfParticlesToEmit, numContinuous, t, dt), kParticleSystemEMStaging);
+		else if(!state.subEmitterCommandBuffer.IsFull())
+			state.subEmitterCommandBuffer.AddCommand(emissionState, initialPosition, initialVelocity, type, subEmitterIndex, amountOfParticlesToEmit, numContinuous, t, dt);
+	}
+}
+
+bool GetTransformationMatrix(Matrix4x4f& output, const bool isSystemInWorld, const bool isCurveInWorld, const Matrix4x4f& localToWorld)
+{
+	if(isCurveInWorld != isSystemInWorld)
+	{
+		if(isSystemInWorld)
+			output = localToWorld;
+		else 
+			Matrix4x4f::Invert_General3D(localToWorld, output);
+		return true;
+	}
+	else
+	{
+		output = Matrix4x4f::identity;
+		return false;
+	}	
+}
+
+bool GetTransformationMatrices(Matrix4x4f& output, Matrix4x4f& outputInverse, const bool isSystemInWorld, const bool isCurveInWorld, const Matrix4x4f& localToWorld)
+{
+	if(isCurveInWorld != isSystemInWorld)
+	{
+		if(isSystemInWorld)
+		{
+			output = localToWorld;
+			Matrix4x4f::Invert_General3D(localToWorld, outputInverse);
+		}
+		else 
+		{
+			Matrix4x4f::Invert_General3D(localToWorld, output);
+			outputInverse = localToWorld;
+		}
+		return true;
+	}
+	else
+	{
+		output = Matrix4x4f::identity;
+		outputInverse = Matrix4x4f::identity;
+		return false;
+	}	
+}