Assets/Shaders/ParticleEmit_CS.glsl

@@ -0,0 +1,117 @@
+#version 450
+
+layout(local_size_x = 128) in;
+
+struct EmitterParameters
+{
+  vec4 angularMin;
+  vec4 angularMax;
+  vec4 lifeAndSizeRange; // min life, max life, min size, max size
+}
+
+struct ParticleData
+{
+  vec4 position;
+  vec4 rotation;
+  vec4 velocity;
+  vec4 acceleration;
+  vec4 scaleAndDecay;
+  float life;
+  uint textureIndex;
+}
+
+struct GenericData
+{
+  //! Delta time
+  float dt;
+
+  //! Elapsed time of the application
+  float elapsedTime;
+
+  //! Viewport width of the scene (excluding imgui, that means smaller than window)
+  uint viewportWidth;
+
+  //! Ditto but for height
+  uint viewportHeight;
+};
+
+layout (set = 0, binding = 0) uniform GenericDataBuffer
+{
+  GenericData data;
+} genericDataBuffer;
+
+layout (std430, set = 2, binding = 0) readonly buffer EmitterBuffer
+{
+  EmitterParameters data;
+} emitterParams;
+
+layout (std430, set = 2, binding = 1) coherent restrict buffer ParticlesInputBuffer
+{
+  ParticleData data[];
+} inputParticles;
+
+// output buffer not needed
+// layout (std430, set = 2, binding = 2) coherent restrict buffer ParticlesOutputBuffer
+// {
+//   ParticleData data[];
+// } outputParticles;
+
+layout (std430, set = 2, binding = 3) coherent restrict buffer ParticlesFreelistBuffer
+{
+  int freeCount;
+  int freeIndices[];
+
+} freelist;
+
+
+// push constants
+layout(std140, push_constant) uniform EmitterPushConstant
+{
+  vec4 emitterPosition;
+  uint emissionCount;
+
+} emitterPushConstant;
+
+uint pcg_hash(uint seed)
+{
+  uint state = seed * 747796405u + 2891336453u;
+  uint word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
+  return (word >> 22u) ^ word;
+}
+
+// Used to advance the PCG state.
+uint rand_pcg(inout uint rng_state)
+{
+  uint state = rng_state;
+  rng_state = rng_state * 747796405u + 2891336453u;
+  uint word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
+  return (word >> 22u) ^ word;
+}
+
+// Advances the prng state and returns the corresponding random float.
+float rand(inout uint state)
+{
+  uint x = rand_pcg(state);
+  state = x;
+  return float(x)*uintBitsToFloat(0x2f800004u);
+}
+
+void main()
+{ 
+  uint emitterInvocationIndex = gl_GlobalInvocationID.x;
+
+  if (emitterInvocationIndex >= emitterPushConstant.emissionCount)
+    return;
+
+  int freelistIndex = atomicAdd (freelist.freeCount, -1) - 1;
+  if (freelistIndex < 0)
+    atomicAdd (freelist.freeCount, 1);
+
+  ParticleData particle;
+
+  int index = freelist.freeIndices[freelistIndex];
+  particle.position = emitterPosition;
+  particle.life = emitterParams.10.0f;
+
+  particles[index] = particle;
+}

Assets/Shaders/ParticleUpdate_CS.glsl

@@ -0,0 +1,141 @@
+#version 450
+
+layout(local_size_x = 128) in;
+
+struct DrawArraysIndirectArgs
+{
+  uint count;
+  uint instanceCount;
+  uint first;
+  uint baseInstance;
+};
+
+struct ParticleData
+{
+  vec4 position;
+  vec4 rotation;
+  vec4 velocity;
+  vec4 acceleration;
+  vec4 scaleAndDecay;
+  float life;
+  uint textureIndex;
+}
+
+struct GenericData
+{
+  //! Delta time
+  float dt;
+
+  //! Elapsed time of the application
+  float elapsedTime;
+
+  //! Viewport width of the scene (excluding imgui, that means smaller than window)
+  uint viewportWidth;
+
+  //! Ditto but for height
+  uint viewportHeight;
+};
+
+layout(set = 1, binding = 0) uniform CameraData
+{
+  vec4 position; 
+  mat4 vpMat;
+  mat4 viewMat;
+  mat4 projMat;
+} cameraData;
+
+
+layout (set = 0, binding = 0) uniform GenericDataBuffer
+{
+  GenericData data;
+} genericDataBuffer;
+
+layout (std430, set = 2, binding = 1) coherent restrict readonly buffer ParticlesInputBuffer
+{
+  ParticleData data[];
+} inputParticles;
+
+// output buffer not needed
+layout (std430, set = 2, binding = 2) coherent restrict buffer ParticlesOutputBuffer
+{
+  ParticleData data[];
+} outputParticles;
+
+layout (std430, set = 2, binding = 3) coherent restrict buffer ParticlesFreelistBuffer
+{
+  int freeCount;
+  int freeIndices[];
+
+} freelist;
+
+layout (std430, set = 2, binding = 4) coherent restrict buffer IndicesData
+{
+  uint indices[];
+};
+
+layout (std140, set = 2, binding = 5) coherent restrict uniform IndirectDrawArgs
+{
+  DrawArraysIndirectArgs indirectArgs;
+};
+
+// push constants
+layout(std140, push_constant) uniform EmitterPushConstant
+{
+  vec4 emitterPosition;
+  uint emissionCount;
+
+} emitterPushConstant;
+
+uint pcg_hash(uint seed)
+{
+  uint state = seed * 747796405u + 2891336453u;
+  uint word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
+  return (word >> 22u) ^ word;
+}
+
+// Used to advance the PCG state.
+uint rand_pcg(inout uint rng_state)
+{
+  uint state = rng_state;
+  rng_state = rng_state * 747796405u + 2891336453u;
+  uint word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
+  return (word >> 22u) ^ word;
+}
+
+// Advances the prng state and returns the corresponding random float.
+float rand(inout uint state)
+{
+  uint x = rand_pcg(state);
+  state = x;
+  return float(x)*uintBitsToFloat(0x2f800004u);
+}
+
+void main()
+{ 
+  uint index = gl_GlobalInvocationID.x;
+
+  ParticleData particle = inputParticles.data[index];
+
+  if (particle.lifetime > 0.0f)
+  {
+    // particle.position += particle.velocity * dt;
+
+    // particle.lifetime -= dt;
+    // particle.size -= 1.2f * dt;
+    // particle.color += 1.0f * dt;
+    
+    if (particle.lifetime < 0.0f || particle.size < 0.0f)
+    {
+      particle.lifetime = 0.0f;
+      particle.position.x = 99999.0f;
+      
+      outputParticles.data[index] = particle;
+      freelist.freeIndices[atomicAdd(freelist.freeCount, 1)] = int (index);
+      return;
+    }
+
+    outputParticles.data[index] = particle;
+    uint drawIndex = atomicAdd (indirectArgs.instanceCount, 1);
+    indices[drawIndex] = index;
+  }
+}

SHADE_Engine/src/Editor/EditorWindow/Inspector/SHEditorComponentView.hpp

@@ -600,7 +600,7 @@ namespace SHADE
         }
       );
 
-      SHEditorWidgets::ColorPicker("Color", [&textComp = component]() {return textComp->GetColour(); }, [&textComp = component](SHVec4 const& newColor) {textComp->SetColour(newColor); });
+      SHEditorWidgets::ColorPicker("Color", [&textComp = component]() {return textComp->GetColor(); }, [&textComp = component](SHVec4 const& newColor) {textComp->SetColor(newColor); });
     }
     else
     {

SHADE_Engine/src/Editor/EditorWindow/Inspector/SHEditorInspector.cpp

@@ -180,6 +180,10 @@ namespace SHADE
         {
           DrawComponent(listenerComponent);
         }
+        if (auto trajectoryComponent = SHComponentManager::GetComponent_s<SHTrajectoryRenderableComponent>(eid))
+        {
+          DrawComponent(trajectoryComponent);
+        }
         ImGui::Separator();
         // Render Scripts
         SHScriptEngine* scriptEngine = static_cast<SHScriptEngine*>(SHSystemManager::GetSystem<SHScriptEngine>());
@@ -195,6 +199,7 @@ namespace SHADE
           DrawAddComponentButton<SHButtonComponent>(eid);
           DrawAddComponentButton<SHToggleButtonComponent>(eid);
           DrawAddComponentButton<SHSliderComponent>(eid);
+          DrawAddComponentButton<SHTrajectoryRenderableComponent>(eid);
 
           // Components that require Transforms
 

SHADE_Engine/src/Graphics/MiddleEnd/GlobalData/SHGraphicsPredefinedData.cpp

@@ -59,6 +59,13 @@ namespace SHADE
       {SHPredefinedDescriptorTypes::STATIC_DATA, 0},
       {SHPredefinedDescriptorTypes::CAMERA,      1},
     });
+
+    perSystemData[SHUtilities::ConvertEnum(SystemType::PARTICLE_RENEDERING)].descMappings.AddMappings
+    ({
+      {SHPredefinedDescriptorTypes::STATIC_DATA, 0},
+      {SHPredefinedDescriptorTypes::CAMERA,      1},
+      {SHPredefinedDescriptorTypes::PARTICLES,   2},
+      });
   }
 
   void SHGraphicsPredefinedData::InitDummyPipelineLayouts(Handle<SHVkLogicalDevice> logicalDevice) noexcept
@@ -194,6 +201,73 @@ namespace SHADE
     Handle<SHVkDescriptorSetLayout> materialBoneDataPerInstanceLayout = logicalDevice->CreateDescriptorSetLayout({ materialDataBinding, boneDataBinding });
     SET_VK_OBJ_NAME(logicalDevice, vk::ObjectType::eDescriptorSetLayout, materialBoneDataPerInstanceLayout->GetVkHandle(), "[Descriptor Set Layout] Material and Bone Globals");
 
+    // particle emitter binding
+    SHVkDescriptorSetLayout::Binding emitterDataBinding 
+    {
+      .Type = vk::DescriptorType::eStorageBufferDynamic,
+      .Stage = vk::ShaderStageFlagBits::eCompute,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::PARTICLE_EMITTER_DATA,
+      .DescriptorCount = 1,
+    };
+
+    // particle input binding
+    SHVkDescriptorSetLayout::Binding particleInputDataBinding
+    {
+      .Type = vk::DescriptorType::eStorageBufferDynamic,
+      .Stage = vk::ShaderStageFlagBits::eCompute,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::PARTICLE_INPUT_DATA,
+      .DescriptorCount = 1,
+    };
+
+    // particle output binding
+    SHVkDescriptorSetLayout::Binding particleOutputDataBinding
+    {
+      .Type = vk::DescriptorType::eStorageBufferDynamic,
+      .Stage = vk::ShaderStageFlagBits::eCompute | vk::ShaderStageFlagBits::eVertex,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::PARTICLE_OUTPUT_DATA,
+      .DescriptorCount = 1,
+    };
+
+    // particle freelist binding
+    SHVkDescriptorSetLayout::Binding particleFreelistBinding
+    {
+      .Type = vk::DescriptorType::eStorageBuffer, // non dynamic because we only need 1 copy for all frames
+      .Stage = vk::ShaderStageFlagBits::eCompute,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::PARTICLE_FREELIST_DATA,
+      .DescriptorCount = 1,
+    };
+
+    // particle indices binding
+    SHVkDescriptorSetLayout::Binding particleIndicesBinding
+    {
+      .Type = vk::DescriptorType::eStorageBufferDynamic, // dynamic because we have multiple copies.
+      .Stage = vk::ShaderStageFlagBits::eCompute | vk::ShaderStageFlagBits::eVertex,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::PARTICLE_INDICES_DATA,
+      .DescriptorCount = 1,
+    };
+
+    // particle draw call binding
+    SHVkDescriptorSetLayout::Binding particleDrawDataBinding
+    {
+      .Type = vk::DescriptorType::eUniformBufferDynamic, // UBO (Because lesser data), dynamic (1 set for each frame)
+      .Stage = vk::ShaderStageFlagBits::eCompute,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::PARTICLE_DRAW_DATA,
+      .DescriptorCount = 1,
+    };
+
+    Handle<SHVkDescriptorSetLayout> particleDescSetLayout = logicalDevice->CreateDescriptorSetLayout(
+      {
+        emitterDataBinding,
+        particleInputDataBinding,
+        particleOutputDataBinding,
+        particleFreelistBinding,
+        particleIndicesBinding,
+        particleDrawDataBinding
+      });
+    SET_VK_OBJ_NAME(logicalDevice, vk::ObjectType::eDescriptorSetLayout, particleDescSetLayout->GetVkHandle(), "[Descriptor Set Layout] Particle System Data");
+
+
+
     predefinedLayouts.push_back(staticGlobalLayout);
     predefinedLayouts.push_back(lightDataDescSetLayout);
     predefinedLayouts.push_back(cameraDataGlobalLayout);
@@ -201,6 +275,7 @@ namespace SHADE
     predefinedLayouts.push_back(fontDataDescSetLayout);
     predefinedLayouts.push_back(shadowMapDescLayout);
     predefinedLayouts.push_back(materialBoneDataPerInstanceLayout);
+    predefinedLayouts.push_back(particleDescSetLayout);
 
     perSystemData[SHUtilities::ConvertEnum(SystemType::BATCHING)].descSetLayouts = GetPredefinedDescSetLayouts
     (
@@ -235,6 +310,13 @@ namespace SHADE
       SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::STATIC_DATA |
       SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::CAMERA
     );
+
+    perSystemData[SHUtilities::ConvertEnum(SystemType::PARTICLE_RENEDERING)].descSetLayouts = GetPredefinedDescSetLayouts
+    (
+      SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::STATIC_DATA |
+      SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::CAMERA |
+      SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::PARTICLES
+    );
   }
 
   void SHGraphicsPredefinedData::InitPredefinedVertexInputState(void) noexcept

SHADE_Engine/src/Graphics/MiddleEnd/GlobalData/SHGraphicsPredefinedData.h

@@ -29,7 +29,8 @@ namespace SHADE
       MATERIALS            = 0b00001000,
       FONT                 = 0b00010000,
       SHADOW               = 0b00100000,
-      MATERIAL_AND_BONES   = 0b01000000
+      MATERIAL_AND_BONES   = 0b01000000,
+      PARTICLES            = 0b10000000
     };
 
     enum class SystemType
@@ -39,6 +40,7 @@ namespace SHADE
       TEXT_RENDERING,
       RENDER_GRAPH_NODE_COMPUTE,
       TRAJECTORY_RENDERING,
+      PARTICLE_RENEDERING,
       NUM_TYPES
     };
     static constexpr int SYSTEM_TYPE_COUNT = static_cast<int>(SystemType::NUM_TYPES);

SHADE_Engine/src/Graphics/MiddleEnd/GlobalData/SHPredefinedDescriptorTypes.h

@@ -16,5 +16,6 @@ namespace SHADE
     FONT,
     RENDER_GRAPH_NODE_COMPUTE_RESOURCE,
     RENDER_GRAPH_RESOURCE,
+    PARTICLES,
   };
 }

SHADE_Engine/src/Graphics/MiddleEnd/Interface/SHGraphicsConstants.h

@@ -233,6 +233,61 @@ namespace SHADE
       */
       /***************************************************************************/
       static constexpr uint32_t BONE_MATRIX_DATA = 1;
+
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for particle emitter data.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t PARTICLE_EMITTER_DATA = 0;
+
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for input particle data.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t PARTICLE_INPUT_DATA = 1;
+
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for output particle data.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t PARTICLE_OUTPUT_DATA = 2;
+
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for particle freelist data.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t PARTICLE_FREELIST_DATA = 3;
+
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for particle indices data.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t PARTICLE_INDICES_DATA = 4;
+
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for bone matrix data.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t PARTICLE_DRAW_DATA = 5;
+
     };
 
     struct VertexBufferBindings

SHADE_Engine/src/Graphics/MiddleEnd/Particles/SHParticleEmitterComponent.cpp

@@ -0,0 +1,23 @@
+#include "SHpch.h"
+#include "SHParticleEmitterComponent.h"
+
+namespace SHADE
+{
+  
+  void SHParticleEmitterComponent::OnCreate(void)
+  {
+    timeBeforeEmission = emissionInterval;
+
+  }
+
+  void SHParticleEmitterComponent::OnDestroy(void)
+  {
+
+  }
+
+  void SHParticleEmitterComponent::Emit(void) noexcept
+  {
+    toEmit = true;
+  }
+
+}

SHADE_Engine/src/Graphics/MiddleEnd/Particles/SHParticleEmitterComponent.h

@@ -0,0 +1,111 @@
+#pragma once
+
+#include "Resource/SHHandle.h"
+#include "Math/Vector/SHVec4.h"
+#include "ECS_Base/Components/SHComponent.h"
+#include "Graphics/MiddleEnd/Interface/SHGraphicsConstants.h"
+
+namespace SHADE
+{
+  class SHVkBuffer;
+  class SHVkDescriptorSetGroup;
+  class SHVkDescriptorSetLayout;
+
+  class SHParticleEmitterComponent : public SHComponent
+  {
+  private:
+    struct GPUEmitterStruct
+    {
+      //! Minimum emitting angular range
+      SHVec4 angularMin;
+
+      //! Maximum emitting angular range
+      SHVec4 angularMax;
+
+      //! Spawn lifetime and size range (min and max)
+      SHVec4 lifeAndSizeRange;
+    };
+
+    struct GPUParticleStruct
+    {
+      //! Position of the particle
+      SHVec4 position;
+
+      //! Rotation of the particle
+      SHVec4 rotation;
+
+      //! Velocity of the particle
+      SHVec4 velocity;
+
+      //! Acceleration of the particle
+      SHVec4 acceleration;
+
+      //! x scale, x scale decay, y scale and y scale decay
+      SHVec4 scaleAndDecay;
+
+      //! Life of the particle
+      float life;
+
+      //! Texture into the desc array that the particle is using
+      uint32_t textureIndex;
+    };
+
+    //! Max number of particles of this emitter
+    uint32_t maxParticles;
+
+    //! num bytes of all particles in 1 chunk (1 frame)
+    uint32_t chunkSize;
+
+    //! emission count per emit
+    uint32_t emissionCount;
+
+    //! emission interval of the emitter
+    float emissionInterval;
+
+    //! Counter that decreases to 0 from emissionInterval. When 0, emit particles.
+    float timeBeforeEmission;
+
+    //! Data for the emitter
+    Handle<SHVkBuffer> emitterData;
+
+    //! GPU Particle data
+    Handle<SHVkBuffer> particleData;
+
+    //! Freelist data 
+    Handle<SHVkBuffer> freelistData; 
+
+    //! Indices data 
+    Handle<SHVkBuffer> indicesData;
+
+    //! draw call data 
+    Handle<SHVkBuffer> drawCallData;
+
+    //! We need more descriptor sets because the operations on a frame's particle data needs to rely on the previous frame's. Each set
+    //! will contain 2 bindings that point to 2 buffers (input and output).
+    Handle<SHVkDescriptorSetGroup> particleDescriptorSet;
+
+    //! Emitter's data on the CPU side. To be copied to GPU.
+    GPUEmitterStruct cpuEmitterData;
+
+    //! If passive, emitter emits particles based on timer above. 
+    bool isPassive;
+
+    //! Have the particle system initialize variables in this component when this is false 
+    bool initialized;
+
+    //! If true, particle system will emit particles in Run function. Sets to false every frame.
+    bool toEmit;
+
+    //! For all the dynamic SSBOs in the descriptor set
+    std::array<std::array<uint32_t, 5>, SHGraphicsConstants::NUM_FRAME_BUFFERS> dynamicOffsets{};
+
+  public:
+    void OnCreate(void) override final;
+    void OnDestroy(void) override final;
+
+    void Emit (void) noexcept;
+
+    friend class SHParticleSubSystem;
+
+  };
+}

SHADE_Engine/src/Graphics/MiddleEnd/Particles/SHParticleSubSustem.h

@@ -1,41 +0,0 @@
-#pragma once
-
-#include "Resource/SHHandle.h"
-#include "Graphics/Pipeline/SHPipelineState.h"
-#include "Math/SHMatrix.h"
-
-namespace SHADE
-{
-  class SHVkLogicalDevice;
-  class SHVkDescriptorPool;
-  class SHVkDescriptorSetGroup;
-  class SHVkDescriptorSetLayout;
-  class SHVkBuffer;
-  class SHLightComponent;
-  class SHVkCommandBuffer;
-  class SHVkPipeline;
-  class SHVkPipelineLayout;
-  class SHVkRenderpass;
-  class SHSubpass;
-  class SHVkShaderModule;
-  class SHRenderer;
-
-
-
-  class SHParticleSubSystem
-  {
-  private:
-
-    Handle<SHVkLogicalDevice> logicalDevice;
-
-
-  public:
-    void Init(Handle<SHVkLogicalDevice> device, Handle<SHVkRenderpass> compatibleRenderpass, Handle<SHSubpass> subpass) noexcept;
-
-    void Run(uint32_t frameIndex) noexcept;
-
-    void Render(Handle<SHVkCommandBuffer> cmdBuffer, Handle<SHRenderer> renderer, uint32_t frameIndex) noexcept;
-    void Exit(void) noexcept;
-
-  };
-}

SHADE_Engine/src/Graphics/MiddleEnd/Particles/SHParticleSubSystem.cpp

@@ -1,7 +1,309 @@
 #include "SHpch.h"
-#include "SHParticleSubSustem.h"
+#include "SHParticleSubSystem.h"
+#include "Graphics/Pipeline/SHPipelineLayoutParams.h"
+#include "Graphics/MiddleEnd/GlobalData/SHGraphicsPredefinedData.h"
+#include "Graphics/Devices/SHVkLogicalDevice.h"
+#include "Graphics/MiddleEnd/Particles/SHParticleEmitterComponent.h"
+#include "ECS_Base/Managers/SHComponentManager.h"
+#include "Graphics/Descriptors/SHVkDescriptorSetGroup.h"
+#include "Graphics/Descriptors/SHVkDescriptorSetLayout.h"
+#include "Graphics/MiddleEnd/GlobalData/SHGlobalDescriptorSets.h"
+#include "Math/Transform/SHTransformComponent.h"
+#include "Graphics/Buffers/SHVkBuffer.h"
 
 namespace SHADE
 {
-  
+
+  void SHParticleSubSystem::InitializeComponent(SHParticleEmitterComponent& comp) noexcept
+  {
+    uint32_t emitterStructAligned = logicalDevice->PadSSBOSize(sizeof (SHParticleEmitterComponent::GPUEmitterStruct));
+    uint32_t particleStructAligned = logicalDevice->PadUBOSize(sizeof (SHParticleEmitterComponent::GPUParticleStruct));
+    uint32_t sizeofIndirectCmd = static_cast<uint32_t>(sizeof(vk::DrawIndirectCommand));
+    uint32_t sizeofUint = static_cast<uint32_t>(sizeof(uint32_t));
+
+    // TODO: temporary only.
+    static constexpr uint32_t NUM_PARTICLES = 500;
+    comp.maxParticles = NUM_PARTICLES;
+
+    // offset into the buffer for input and output
+    uint32_t const PARTICLE_FRAME_CHUNK_SIZE = (particleStructAligned * comp.maxParticles);
+
+    // Buffer Initialization
+    {
+      // count, value
+      std::vector<uint32_t> freelistInit(comp.maxParticles + 1, 0);
+      freelistInit[0] = comp.maxParticles;
+
+      // Particle emitter buffer. Multiple copies, Host-visible mapped. We want multiple copies because we'll be writing to it from the CPU. We don't want to do that while the GPU
+      // is using it during compute operations so we write to another portion.
+      comp.emitterData = logicalDevice->CreateBuffer(SHGraphicsConstants::NUM_FRAME_BUFFERS * emitterStructAligned, nullptr, 0, vk::BufferUsageFlagBits::eStorageBuffer, VMA_MEMORY_USAGE_AUTO, VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT | VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_MAPPED_BIT);
+
+      // buffer for particle data: pure GPU memory, no transfers, no flags.  We want to triple buffer this so that we can submit work to the GPU 
+      // without having to wait for rendering to finish reading the data
+      comp.particleData = logicalDevice->CreateBuffer(SHGraphicsConstants::NUM_FRAME_BUFFERS * particleStructAligned * NUM_PARTICLES, nullptr, 0, vk::BufferUsageFlagBits::eStorageBuffer, VMA_MEMORY_USAGE_AUTO, {});
+
+      // Buffer for freelist data. 1 copy only, host-visible mapped. We only need 1 copy because it is only required in compute. If it was used or read in another
+      // stage we would need more copies.
+      comp.freelistData = logicalDevice->CreateBuffer(sizeofUint * (comp.maxParticles + 1), freelistInit.data(), sizeofUint * (comp.maxParticles + 1), vk::BufferUsageFlagBits::eStorageBuffer, VMA_MEMORY_USAGE_AUTO, VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT | VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_MAPPED_BIT);
+
+      // Buffer for indices. NUM_FRAME_BUFFERS copies since it's used in rendering. host-visible mapped.
+      comp.indicesData = logicalDevice->CreateBuffer(sizeofUint * comp.maxParticles, nullptr, 0, vk::BufferUsageFlagBits::eStorageBuffer, VMA_MEMORY_USAGE_AUTO, VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT | VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_MAPPED_BIT);
+
+      // Draw call data will not be tampered with after this initialization except for one variable: instanceCount, which will be modified from compute shader
+      std::array<vk::DrawIndirectCommand, SHGraphicsConstants::NUM_FRAME_BUFFERS> indirectCommands{};
+      for (auto& cmd : indirectCommands)
+      {
+        cmd.vertexCount = 4;
+        cmd.firstVertex = 0;
+        cmd.firstInstance = 0;
+        cmd.instanceCount = 0;
+      }
+
+      // buffer to store draw call data. Non-indexed, host-visible mapped, triple buffered. 
+      comp.drawCallData = logicalDevice->CreateBuffer(SHGraphicsConstants::NUM_FRAME_BUFFERS * sizeofIndirectCmd, indirectCommands.data(), SHGraphicsConstants::NUM_FRAME_BUFFERS * sizeofIndirectCmd, vk::BufferUsageFlagBits::eUniformBuffer | vk::BufferUsageFlagBits::eIndirectBuffer, VMA_MEMORY_USAGE_AUTO, VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT | VmaAllocationCreateFlagBits::VMA_ALLOCATION_CREATE_MAPPED_BIT);
+
+    }
+
+    // Descriptor set initialization
+    {
+      // Get particle desc set layout
+      auto descSetLayout = SHGraphicsPredefinedData::GetPredefinedDescSetLayouts(SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::PARTICLES);
+
+      // Since we are populating the set as is, the set index will be 0
+      static constexpr uint32_t PARTICLE_DATA_SET_INDEX = 0;
+
+      // Variable desc counts, all ignored anyway (This is required but its a dumb interface. You can only blame yourself, Brandon. )
+      std::vector const VARIABLE_COUNTS = {0u,0u,0u,0u,0u};
+
+      // allocate new desc set
+      comp.particleDescriptorSet = descPool->Allocate(descSetLayout, VARIABLE_COUNTS);
+
+      // convenience handle
+      auto set = comp.particleDescriptorSet;
+
+      // After buffers are created, we want to populate all bindings(6) with the buffers
+      set->ModifyWriteDescBuffer(PARTICLE_DATA_SET_INDEX, SHGraphicsConstants::DescriptorSetBindings::PARTICLE_EMITTER_DATA, { &comp.emitterData, 1 }, 0, emitterStructAligned);
+      set->ModifyWriteDescBuffer(PARTICLE_DATA_SET_INDEX, SHGraphicsConstants::DescriptorSetBindings::PARTICLE_INPUT_DATA, { &comp.particleData, 1 }, 0, PARTICLE_FRAME_CHUNK_SIZE); // input and output will be th same until we bind using dynamic offsets
+      set->ModifyWriteDescBuffer(PARTICLE_DATA_SET_INDEX, SHGraphicsConstants::DescriptorSetBindings::PARTICLE_OUTPUT_DATA, { &comp.particleData, 1 }, 0, PARTICLE_FRAME_CHUNK_SIZE);
+      set->ModifyWriteDescBuffer(PARTICLE_DATA_SET_INDEX, SHGraphicsConstants::DescriptorSetBindings::PARTICLE_FREELIST_DATA, { &comp.freelistData, 1 }, 0, sizeofUint * (comp.maxParticles + 1));
+      set->ModifyWriteDescBuffer(PARTICLE_DATA_SET_INDEX, SHGraphicsConstants::DescriptorSetBindings::PARTICLE_INDICES_DATA, { &comp.indicesData, 1 }, 0, sizeofUint * (comp.maxParticles));
+      set->ModifyWriteDescBuffer(PARTICLE_DATA_SET_INDEX, SHGraphicsConstants::DescriptorSetBindings::PARTICLE_DRAW_DATA, { &comp.drawCallData, 1 }, 0, sizeofIndirectCmd);
+    }
+
+    comp.initialized = true;
+    comp.timeBeforeEmission = comp.emissionInterval;
+    comp.toEmit = false;
+    comp.chunkSize = PARTICLE_FRAME_CHUNK_SIZE;
+
+    for (uint32_t i = 0; i < SHGraphicsConstants::NUM_FRAME_BUFFERS; ++i)
+    {
+      auto& offsets = comp.dynamicOffsets[i];
+
+      uint32_t inputOffset = PARTICLE_FRAME_CHUNK_SIZE * ((i + SHGraphicsConstants::NUM_FRAME_BUFFERS - 1) % SHGraphicsConstants::NUM_FRAME_BUFFERS); // take previous frame's data
+      uint32_t outputOffset = PARTICLE_FRAME_CHUNK_SIZE * i; 
+
+      // In the order of: 
+      // 1. Emitter data
+      // 2. Particle input
+      // 3. Particle output
+      // 4. Particle draw data
+      offsets[DYOFF_INDEX_EMITTER] = i * emitterStructAligned;
+      offsets[DYOFF_INDEX_PARTICLE_INPUT] = inputOffset;
+      offsets[DYOFF_INDEX_PARTICLE_OUTPUT] = outputOffset;
+      offsets[DYOFF_INDEX_INDICES_DATA] = i * sizeofUint * comp.maxParticles;
+      offsets[DYOFF_INDEX_DRAW_DATA] = i * sizeofIndirectCmd;
+    }
+  }
+
+  void SHParticleSubSystem::EmitComponent(Handle<SHVkCommandBuffer> cmdBuffer, SHParticleEmitterComponent& comp, uint32_t frameIndex) noexcept
+  {
+    auto const& mappings = SHGraphicsPredefinedData::GetMappings(SHGraphicsPredefinedData::SystemType::PARTICLE_RENEDERING);
+    auto* transform = SHComponentManager::GetComponent<SHTransformComponent>(comp.GetEID());
+
+    // bind the descriptor sets required for emitting particles
+    cmdBuffer->BindDescriptorSet(comp.particleDescriptorSet, SH_PIPELINE_TYPE::COMPUTE, mappings.at(SHPredefinedDescriptorTypes::PARTICLES), comp.dynamicOffsets[frameIndex]);
+
+    cmdBuffer->SetPushConstantVariable("EmitterPushConstant.emitterPosition", transform->GetWorldPosition(), SH_PIPELINE_TYPE::COMPUTE);
+    cmdBuffer->SetPushConstantVariable("EmitterPushConstant.emissionCount", comp.emissionCount, SH_PIPELINE_TYPE::COMPUTE);
+
+    // emit particles
+    cmdBuffer->ComputeDispatch((comp.emissionCount / EMITTER_WORKGROUP_SIZE) + 1, 1, 1);
+  }
+
+  void SHParticleSubSystem::UpdateCompoennt(Handle<SHVkCommandBuffer> cmdBuffer, SHParticleEmitterComponent& comp, uint32_t frameIndex) noexcept
+  {
+    auto const& mappings = SHGraphicsPredefinedData::GetMappings(SHGraphicsPredefinedData::SystemType::PARTICLE_RENEDERING);
+
+    uint32_t instanceCountOffset = sizeof (vk::DrawIndirectCommand) * frameIndex + offsetof(vk::DrawIndirectCommand, instanceCount);
+    uint32_t ZERO = 0;
+
+    // reset instance count to 0
+    comp.drawCallData->WriteToMemory (&ZERO, sizeof(uint32_t), 0, instanceCountOffset);
+
+
+    // bind the descriptor sets required for emitting particles
+    cmdBuffer->BindDescriptorSet(comp.particleDescriptorSet, SH_PIPELINE_TYPE::COMPUTE, mappings.at(SHPredefinedDescriptorTypes::PARTICLES), comp.dynamicOffsets[frameIndex]);
+
+    // dispatch the compute shaders to update particles
+    cmdBuffer->ComputeDispatch((comp.maxParticles / EMITTER_WORKGROUP_SIZE) + 1, 1, 1);
+  }
+
+  void SHParticleSubSystem::RenderComponent(Handle<SHVkCommandBuffer> cmdBuffer, SHParticleEmitterComponent& comp, uint32_t frameIndex) noexcept
+  {
+
+  }
+
+  void SHParticleSubSystem::Init(Handle<SHVkLogicalDevice> device, Handle<SHVkDescriptorPool> inDescPool, Handle<SHVkRenderpass> compatibleRenderpass, Handle<SHSubpass> subpass, Handle<SHVkShaderModule> VS, Handle<SHVkShaderModule> FS, Handle<SHVkShaderModule> emitCS, Handle<SHVkShaderModule> defaultUpdateCS) noexcept
+  {
+    descPool = inDescPool;
+    logicalDevice = device;
+
+    /*-----------------------------------------------------------------------*/
+    /* INITIALIZE ALL PIPELINES                                              */
+    /*-----------------------------------------------------------------------*/
+    SHPipelineLayoutParams plParams
+    {
+      .shaderModules = {VS, FS},
+      .predefinedDescSetLayouts = SHGraphicsPredefinedData::GetSystemData(SHGraphicsPredefinedData::SystemType::PARTICLE_RENEDERING).descSetLayouts
+    };
+
+    renderingPipelineData.pipelineLayout = logicalDevice->CreatePipelineLayout(plParams);
+    renderingPipelineData.pipeline = logicalDevice->CreateGraphicsPipeline(renderingPipelineData.pipelineLayout, nullptr, compatibleRenderpass, subpass);
+
+    SHPipelineLayoutParams emitPlParams
+    {
+      .shaderModules = {emitCS},
+      .predefinedDescSetLayouts = SHGraphicsPredefinedData::GetSystemData(SHGraphicsPredefinedData::SystemType::PARTICLE_RENEDERING).descSetLayouts
+    };
+
+    emittingPipelineData.pipelineLayout = logicalDevice->CreatePipelineLayout(emitPlParams);
+    emittingPipelineData.pipeline = logicalDevice->CreateComputePipeline(emittingPipelineData.pipelineLayout);
+
+    SHPipelineLayoutParams defaultUpdatePlParams
+    {
+      .shaderModules = {defaultUpdateCS},
+      .predefinedDescSetLayouts = SHGraphicsPredefinedData::GetSystemData(SHGraphicsPredefinedData::SystemType::PARTICLE_RENEDERING).descSetLayouts
+    };
+
+    defaultUpdatePipelineData.pipelineLayout = logicalDevice->CreatePipelineLayout(defaultUpdatePlParams);
+    defaultUpdatePipelineData.pipeline = logicalDevice->CreateComputePipeline(defaultUpdatePipelineData.pipelineLayout);
+
+
+    /*-----------------------------------------------------------------------*/
+    /* OTHER INITIALIZATION                                                  */
+    /*-----------------------------------------------------------------------*/
+    SHComponentManager::CreateComponentSparseSet<SHParticleEmitterComponent>();
+  }
+
+  void SHParticleSubSystem::Run(Handle<SHVkCommandBuffer> cmdBuffer, uint32_t frameIndex, float dt) noexcept
+  {
+    auto& emitters = SHComponentManager::GetDense<SHParticleEmitterComponent>();
+    auto const& mappings = SHGraphicsPredefinedData::GetMappings(SHGraphicsPredefinedData::SystemType::PARTICLE_RENEDERING);
+
+    // Get offset into GPU emitter data (for updating)
+    uint32_t emitterDataOffset = frameIndex * sizeof (SHParticleEmitterComponent::GPUEmitterStruct);
+    
+    // Barriers to make sure emitting shader is done completely before update is run.
+    // Every emitter will have its own barrier.
+    std::vector<vk::BufferMemoryBarrier> preUpdateBarriers{};
+    preUpdateBarriers.resize(emitters.size());
+
+    // If we wanted to be VERY safe, a barrier would be good here to make sure output particles have finish reading input particles in 
+    // the update compute. HOWEVER since a NUM_FRAME_BUFFERS frames would have passed by then, we will not insert 1 here.
+
+    /*-----------------------------------------------------------------------*/
+    /* BEGIN EMITTING PARTICES                                               */
+    /*-----------------------------------------------------------------------*/
+
+    // TODO: Might need to issue a barrier here for input particle data
+
+    // bind the pipeline for emitting particles
+    cmdBuffer->BindPipeline(emittingPipelineData.pipeline);
+
+    // Generic data 
+    SHGlobalDescriptorSets::BindGenericAndTextureData(logicalDevice, cmdBuffer, SH_PIPELINE_TYPE::COMPUTE, mappings.at(SHPredefinedDescriptorTypes::STATIC_DATA), frameIndex);
+
+    uint32_t i = 0;
+    for (auto& emitter : emitters)
+    {
+      if (!emitter.initialized)
+        InitializeComponent(emitter);
+
+    	// Set emitter emit flag to true here if there are ready to be emitted
+      if (emitter.isPassive)
+      {
+        // decrement emission timer
+        emitter.timeBeforeEmission -= dt;
+
+        // Check if time to emit
+        if (emitter.timeBeforeEmission <= 0.0f)
+        {
+          // reset timer
+          emitter.timeBeforeEmission = emitter.emissionInterval;
+
+          // Emit later
+          emitter.toEmit = true;
+        }
+      }
+
+      if (emitter.toEmit) // take note that if emitter is not passive, this can also be set to true outside of this function
+      {
+        // Copy data to host visible buffer of emitter
+        emitter.emitterData->WriteToMemory (&emitter.cpuEmitterData, sizeof (SHParticleEmitterComponent::GPUEmitterStruct), 0, emitterDataOffset);
+
+        // Call emit function here
+        EmitComponent(cmdBuffer, emitter, frameIndex);
+      }
+
+      // make new barrier on stack...
+      vk::BufferMemoryBarrier barrier
+      {
+        .srcAccessMask = vk::AccessFlagBits::eShaderWrite,
+        .dstAccessMask = vk::AccessFlagBits::eShaderRead,
+        .buffer = emitter.particleData->GetVkBuffer(),
+        .offset = emitter.dynamicOffsets[frameIndex][DYOFF_INDEX_PARTICLE_INPUT],
+        .size = emitter.chunkSize
+      };
+
+      // ...copy assign barrier on heap 
+      preUpdateBarriers[i] = barrier;
+
+      emitter.toEmit = false;
+      ++i;
+    }
+
+    // issue the barrier to wait
+    cmdBuffer->PipelineBarrier(vk::PipelineStageFlagBits::eComputeShader, vk::PipelineStageFlagBits::eComputeShader, {}, {}, preUpdateBarriers, {});
+
+    /*-----------------------------------------------------------------------*/
+    /* EMITTING PARTICLES DONE, BEGIN UPDATES....                            */
+    /*-----------------------------------------------------------------------*/
+
+    // bind the pipeline for updating 
+    cmdBuffer->BindPipeline(defaultUpdatePipelineData.pipeline);
+
+    for (auto& emitter : emitters)
+    {
+      UpdateCompoennt(cmdBuffer, emitter, frameIndex);
+    }
+
+    
+  }
+
+  void SHParticleSubSystem::Render(Handle<SHVkCommandBuffer> cmdBuffer, Handle<SHRenderer> renderer, uint32_t frameIndex) noexcept
+  {
+    auto& emitters = SHComponentManager::GetDense<SHParticleEmitterComponent>();
+
+    // TODO: Issue barrier for output particle data. Semaphore should also be issued outside in SHGraphicsSystem
+    for (auto& emitter : emitters)
+    {
+    	
+    }
+  }
+
+  void SHParticleSubSystem::Exit(void) noexcept
+  {
+
+  }
+
 }

SHADE_Engine/src/Graphics/MiddleEnd/Particles/SHParticleSubSystem.h

@@ -0,0 +1,93 @@
+#pragma once
+
+#include "Resource/SHHandle.h"
+#include "Graphics/Pipeline/SHPipelineState.h"
+#include "Math/SHMatrix.h"
+
+namespace SHADE
+{
+  class SHVkLogicalDevice;
+  class SHVkDescriptorPool;
+  class SHVkDescriptorSetGroup;
+  class SHVkDescriptorSetLayout;
+  class SHVkBuffer;
+  class SHLightComponent;
+  class SHVkCommandBuffer;
+  class SHVkPipeline;
+  class SHVkPipelineLayout;
+  class SHVkRenderpass;
+  class SHSubpass;
+  class SHVkShaderModule;
+  class SHRenderer;
+  class SHParticleEmitterComponent;
+
+
+
+  class SHParticleSubSystem
+  {
+  private:
+    static constexpr uint32_t EMITTER_WORKGROUP_SIZE = 128;
+    static constexpr uint32_t DYOFF_INDEX_EMITTER = 0;
+    static constexpr uint32_t DYOFF_INDEX_PARTICLE_INPUT = 1;
+    static constexpr uint32_t DYOFF_INDEX_PARTICLE_OUTPUT = 2;
+    static constexpr uint32_t DYOFF_INDEX_INDICES_DATA = 3;
+    static constexpr uint32_t DYOFF_INDEX_DRAW_DATA = 4;
+
+
+    // To hold data for a pipeline and pipeline layout.
+    // We want this here because particles require 3 pipeline sets:
+    // - Rendering
+    // - Emit Compute
+    // - Update Compute
+    struct PipelineData
+    {
+      //! Pipeline
+      Handle<SHVkPipeline> pipeline;
+
+      //! Pipeline layout for pipeline creation
+      Handle<SHVkPipelineLayout> pipelineLayout;
+    };
+
+#if 0 // not used, mainly for convenience to show what shaders use
+    // Push constant data for emitters
+    struct EmitterShaderPC
+    {
+      //! Emitter position
+      SHVec4 emitterPosition;
+
+      //! emission count for 1 single emission
+      uint32_t emissionCount;
+    };
+#endif 
+
+    //! Logical device for creation and destruction
+    Handle<SHVkLogicalDevice> logicalDevice;
+
+    //! Pipeline data for rendering particles
+    PipelineData renderingPipelineData;
+
+    //! Pipeline data for emitting particles
+    PipelineData emittingPipelineData;
+
+    //! Pipeline data for updating particles
+    PipelineData defaultUpdatePipelineData;
+
+    //! Desc pool for particle component desc set allocation
+    Handle<SHVkDescriptorPool> descPool;
+
+
+    void InitializeComponent (SHParticleEmitterComponent& comp) noexcept;
+    void EmitComponent (Handle<SHVkCommandBuffer> cmdBuffer, SHParticleEmitterComponent& comp, uint32_t frameIndex) noexcept;
+    void UpdateCompoennt(Handle<SHVkCommandBuffer> cmdBuffer, SHParticleEmitterComponent& comp, uint32_t frameIndex) noexcept;
+    void RenderComponent(Handle<SHVkCommandBuffer> cmdBuffer, SHParticleEmitterComponent& comp, uint32_t frameIndex) noexcept;
+
+  public:
+    void Init(Handle<SHVkLogicalDevice> device, Handle<SHVkDescriptorPool> inDescPool, Handle<SHVkRenderpass> compatibleRenderpass, Handle<SHSubpass> subpass, Handle<SHVkShaderModule> VS, Handle<SHVkShaderModule> FS, Handle<SHVkShaderModule> emitCS, Handle<SHVkShaderModule> defaultUpdateCS) noexcept;
+
+    void Run(Handle<SHVkCommandBuffer> cmdBuffer, uint32_t frameIndex, float dt) noexcept;
+
+    void Render(Handle<SHVkCommandBuffer> cmdBuffer, Handle<SHRenderer> renderer, uint32_t frameIndex) noexcept;
+    void Exit(void) noexcept;
+
+  };
+}

SHADE_Engine/src/Graphics/MiddleEnd/TextRendering/SHTextRenderableComponent.cpp

@@ -61,7 +61,7 @@ namespace SHADE
     MakeDirty();
   }
 
-  void SHTextRenderableComponent::SetColour(SHColour const& newColor) noexcept
+  void SHTextRenderableComponent::SetColor(SHColour const& newColor) noexcept
   {
     color = newColor;
   }
@@ -87,7 +87,7 @@ namespace SHADE
     return fontHandle;
   }
 
-  SHADE::SHColour const& SHTextRenderableComponent::GetColour(void) const noexcept
+  SHADE::SHColour const& SHTextRenderableComponent::GetColor(void) const noexcept
   {
     return color;
   }

SHADE_Engine/src/Graphics/MiddleEnd/TextRendering/SHTextRenderableComponent.h

@@ -52,11 +52,11 @@ namespace SHADE
     /*-----------------------------------------------------------------------*/
     void               SetText (std::string_view newText) noexcept;
     void               SetFont(Handle<SHFont> font) noexcept;
-    void               SetColour(SHColour const& newColor) noexcept;
+    void               SetColor(SHColour const& newColor) noexcept;
 
     std::string const& GetText (void) const noexcept;
     Handle<SHFont>     GetFont (void) const noexcept;
-    SHColour const&    GetColour (void) const noexcept;
+    SHColour const&    GetColor (void) const noexcept;
 
     friend class SHTextRenderingSubSystem;
 

SHADE_Engine/src/Graphics/MiddleEnd/TrajectoryRendering/SHTrajectoryRenderableComponent.cpp

@@ -42,16 +42,26 @@ namespace SHADE
     return mesh;
   }
 
-  SHVec4 const& SHTrajectoryRenderableComponent::GetStartColor(void) const noexcept
+  SHVec3 const& SHTrajectoryRenderableComponent::GetStartColor(void) const noexcept
   {
     return startColor;
   }
 
-  SHVec4 const& SHTrajectoryRenderableComponent::GetEndColor(void) const noexcept
+  SHVec3 const& SHTrajectoryRenderableComponent::GetEndColor(void) const noexcept
   {
     return endColor;
   }
 
+  float SHTrajectoryRenderableComponent::GetStartAlpha(void) const noexcept
+  {
+    return startAlpha;
+  }
+
+  float SHTrajectoryRenderableComponent::GetEndAlpha(void) const noexcept
+  {
+    return endAlpha;
+  }
+
   float SHTrajectoryRenderableComponent::GetColorEvolveRate(void) const noexcept
   {
     return colorEvolveRate;
@@ -67,17 +77,27 @@ namespace SHADE
     positions = inPositions;
   }
 
-  void SHTrajectoryRenderableComponent::SetStartColor(SHVec4 color) noexcept
+  void SHTrajectoryRenderableComponent::SetStartColor(SHVec3 color) noexcept
   {
     startColor = color;
   }
 
-  void SHTrajectoryRenderableComponent::SetEndColor(SHVec4 color) noexcept
+  void SHTrajectoryRenderableComponent::SetEndColor(SHVec3 color) noexcept
   {
     endColor = color;
 
   }
 
+  void SHTrajectoryRenderableComponent::SetStartAlpha(float a) noexcept
+  {
+    startAlpha = a;
+  }
+
+  void SHTrajectoryRenderableComponent::SetEndAlpha(float a) noexcept
+  {
+    endAlpha = a;
+  }
+
   void SHTrajectoryRenderableComponent::SetColorEvolveRate(float rate) noexcept
   {
     colorEvolveRate = rate;

SHADE_Engine/src/Graphics/MiddleEnd/TrajectoryRendering/SHTrajectoryRenderableComponent.h

@@ -10,7 +10,7 @@ namespace SHADE
 {
   class SHMesh;
 
-  class SHTrajectoryRenderableComponent : public SHComponent
+  class SH_API SHTrajectoryRenderableComponent : public SHComponent
   {
   private:
 
@@ -21,10 +21,16 @@ namespace SHADE
     std::vector<SHVec3> positions;
 
     //! Starting color of the trajectory
-    SHVec4 startColor;
+    SHVec3 startColor;
 
     //! Color the trajectory should evolve to the longer it is
-    SHVec4 endColor;
+    SHVec3 endColor;
+
+    //! Starting alpha of the trajectory
+    float startAlpha;
+
+    //! end alpha of the trajectory
+    float endAlpha;
 
     //! evolving rate of the color
     float colorEvolveRate;
@@ -35,14 +41,18 @@ namespace SHADE
     /*-----------------------------------------------------------------------*/
     void SetMesh(Handle<SHMesh> newMesh) noexcept;
     void SetPositions (std::vector<SHVec3> const& inPositions) noexcept;
-    void SetStartColor(SHVec4 startColor) noexcept;
+    void SetStartColor(SHVec3 startColor) noexcept;
-    void SetEndColor  (SHVec4 endColor) noexcept;
+    void SetEndColor  (SHVec3 endColor) noexcept;
-    void SetColorEvolveRate (float rate) noexcept;
+    void SetStartAlpha(float a) noexcept;
+    void SetEndAlpha  (float a) noexcept;
+    void SetColorEvolveRate(float rate) noexcept;
 
     std::vector<SHVec3> GetPositions       (void) const noexcept;
     Handle<SHMesh>      GetMesh            (void) const noexcept;
-    SHVec4 const&       GetStartColor      (void) const noexcept;
+    SHVec3 const&       GetStartColor      (void) const noexcept;
-    SHVec4 const&       GetEndColor        (void) const noexcept;
+    SHVec3 const&       GetEndColor        (void) const noexcept;
+    float               GetStartAlpha      (void) const noexcept;
+    float               GetEndAlpha        (void) const noexcept;
     float               GetColorEvolveRate (void) const noexcept;
 
     void OnCreate(void) override final;

SHADE_Engine/src/Graphics/MiddleEnd/TrajectoryRendering/SHTrajectoryRenderingSubSystem.cpp

@@ -59,8 +59,8 @@ namespace SHADE
           .srcColorBlendFactor = vk::BlendFactor::eSrcAlpha,
           .dstColorBlendFactor = vk::BlendFactor::eOneMinusSrcAlpha,
           .colorBlendOp = vk::BlendOp::eAdd,
-          .srcAlphaBlendFactor = vk::BlendFactor::eOne,
+          .srcAlphaBlendFactor = vk::BlendFactor::eSrcAlpha,
-          .dstAlphaBlendFactor = vk::BlendFactor::eZero,
+          .dstAlphaBlendFactor = vk::BlendFactor::eOneMinusSrcAlpha,
           .alphaBlendOp = vk::BlendOp::eAdd,
           .colorWriteMask = vk::ColorComponentFlagBits::eR | vk::ColorComponentFlagBits::eG | vk::ColorComponentFlagBits::eB | vk::ColorComponentFlagBits::eA,
         }
@@ -84,12 +84,18 @@ namespace SHADE
       // If has positions, feed data to buffer.
       if (comp.HasPositions())
       {
+        auto meshHandle = comp.GetMesh();
+
+        // dont do anything if no mesh
+        if (!meshHandle)
+          continue;
+
         SHTransformComponent* transform = SHComponentManager::GetComponent_s<SHTransformComponent>(comp.GetEID());
         if (transform)
         {
           // convenient variable
-          SHVec4 const& startColor = comp.GetStartColor();
+          SHVec3 const& startColor = comp.GetStartColor();
-          SHVec4 const& endColor = comp.GetEndColor();
+          SHVec3 const& endColor = comp.GetEndColor();
           float colorEvolveRate = comp.GetColorEvolveRate();
 
           // trs to be reused
@@ -104,7 +110,6 @@ namespace SHADE
           // Will be used for baseInstance later
           uint32_t oldTransformDataSize = transformData.size();
 
-          auto meshHandle = comp.GetMesh();
 
           auto const& positions = comp.GetPositions();
           for (auto& pos : positions)
@@ -118,7 +123,8 @@ namespace SHADE
             colorData.push_back(currentColor);
 
             // evolve color
-            currentColor = SHVec4::Lerp(startColor, endColor, lerpValue);
+            currentColor = SHVec3::Lerp(startColor, endColor, lerpValue);
+            currentColor.w = SHMath::Lerp (comp.GetStartAlpha(), comp.GetEndAlpha(), lerpValue);
 
             // evolve lerp value and clamp to 1
             lerpValue = std::max (1.0f, lerpValue + colorEvolveRate);

SHADE_Engine/src/Serialization/SHYAMLConverters.h

@@ -15,6 +15,7 @@
 #include "Graphics/MiddleEnd/TextRendering/SHFont.h"
 #include "Animation/SHAnimatorComponent.h"
 #include "Physics/Collision/CollisionTags/SHCollisionTagMatrix.h"
+#include "Graphics/MiddleEnd/TrajectoryRendering/SHTrajectoryRenderableComponent.h"
 
 namespace YAML
 {
@@ -353,12 +354,14 @@ namespace YAML
   {
     static constexpr std::string_view TEXT_YAML_TAG = "Text";
     static constexpr std::string_view FONT_YAML_TAG = "Font";
+    static constexpr std::string_view COLOR_YAML_TAG = "Color";
 
     static YAML::Node encode(SHTextRenderableComponent const& rhs)
     {
       YAML::Node node;
       node[TEXT_YAML_TAG.data()] = rhs.GetText();
       auto font = rhs.GetFont();
+      SHColour const& textColor = rhs.GetColor();
       if (font)
       {
         node[FONT_YAML_TAG.data()] = SHResourceManager::GetAssetID<SHFont>(rhs.GetFont()).value_or(0);
@@ -367,6 +370,7 @@ namespace YAML
       {
         node[FONT_YAML_TAG.data()] = 0;
       }
+      node[COLOR_YAML_TAG.data()] = SHVec4 (textColor);
       return node;
     }
     static bool decode(YAML::Node const& node, SHTextRenderableComponent& rhs)
@@ -385,11 +389,15 @@ namespace YAML
 
         rhs.SetFont(SHResourceManager::LoadOrGet<SHFont>(node[FONT_YAML_TAG.data()].as<AssetID>()));
       }
+      if (node[COLOR_YAML_TAG.data()].IsDefined())
+      {
+        rhs.SetColor(node[COLOR_YAML_TAG.data()].as<SHVec4>());
+      }
       return true;
     }
   };
 
-  
+
   template<>
   struct convert<SHAnimatorComponent>
   {
@@ -417,4 +425,37 @@ namespace YAML
     }
   };
 
+  template<>
+  struct convert<SHTrajectoryRenderableComponent>
+  {
+    static constexpr std::string_view MESH_YAML_TAG = "Mesh";
+    static constexpr std::string_view START_COLOR_YAML_TAG = "Start Color";
+    static constexpr std::string_view END_COLOR_YAML_TAG = "End Color";
+    static constexpr std::string_view COLOR_EVAL_RATE_YAML_TAG = "Color Eval Rate ";
+
+    static YAML::Node encode(SHTrajectoryRenderableComponent const& rhs)
+    {
+      YAML::Node node;
+      node[MESH_YAML_TAG.data()] = SHResourceManager::GetAssetID<SHMesh>(rhs.GetMesh()).value_or(0);
+      node[START_COLOR_YAML_TAG.data()] = SHVec3(rhs.GetStartColor());
+      node[END_COLOR_YAML_TAG.data()] = SHVec3(rhs.GetEndColor());
+      node[COLOR_EVAL_RATE_YAML_TAG.data()] = rhs.GetColorEvolveRate();
+
+      return node;
+    }
+    static bool decode(YAML::Node const& node, SHTrajectoryRenderableComponent& rhs)
+    {
+      if (node[MESH_YAML_TAG.data()].IsDefined())
+        rhs.SetMesh(SHResourceManager::LoadOrGet<SHMesh>(node[MESH_YAML_TAG.data()].as<AssetID>()));
+      if (node[START_COLOR_YAML_TAG.data()].IsDefined())
+        rhs.SetStartColor(node[START_COLOR_YAML_TAG.data()].as<SHVec3>());
+      if (node[END_COLOR_YAML_TAG.data()].IsDefined())
+        rhs.SetEndColor(node[END_COLOR_YAML_TAG.data()].as<SHVec3>());
+      if (node[COLOR_EVAL_RATE_YAML_TAG.data()].IsDefined())
+        rhs.SetColorEvolveRate(node[COLOR_EVAL_RATE_YAML_TAG.data()].as<float>());
+
+      return true;
+    }
+  };
+
 }

SHADE_Managed/src/Components/TrajectoryRenderable.cxx

@@ -0,0 +1,83 @@
+#include "SHpch.h"
+
+#include "TrajectoryRenderable.hxx"
+#include "Assets/NativeAsset.hxx"
+#include "Utility/Convert.hxx"
+
+
+namespace SHADE
+{
+  TrajectoryRenderable::TrajectoryRenderable(Entity entity)
+    :Component(entity)
+  {
+
+  }
+
+  MeshAsset TrajectoryRenderable::Mesh::get()
+  {
+    auto mesh = GetNativeComponent()->GetMesh();
+    return mesh ? MeshAsset(mesh) : MeshAsset();
+  }
+  void TrajectoryRenderable::Mesh::set(MeshAsset value)
+  {
+    if (value)
+    {
+      GetNativeComponent()->SetMesh(Handle<SHMesh>());
+    }
+    else
+    {
+      GetNativeComponent()->SetMesh(value.NativeObject);
+    }
+  }
+
+
+  void TrajectoryRenderable::StartColor::set(Vector3 val)
+  {
+    GetNativeComponent()->SetStartColor(Convert::ToNative(val));
+  }
+
+  Vector3 TrajectoryRenderable::StartColor::get()
+  {
+    return Convert::ToCLI(GetNativeComponent()->GetStartColor());
+  }
+
+  void TrajectoryRenderable::EndColor::set(Vector3 val)
+  {
+    GetNativeComponent()->SetEndColor(Convert::ToNative(val));
+  }
+
+  Vector3 TrajectoryRenderable::EndColor::get()
+  {
+    return Convert::ToCLI(GetNativeComponent()->GetEndColor());
+  }
+
+  void TrajectoryRenderable::StartAlpha::set(float val)
+  {
+    GetNativeComponent()->SetStartAlpha(val);
+  }
+
+  float TrajectoryRenderable::StartAlpha::get()
+  {
+    return GetNativeComponent()->GetStartAlpha();
+  }
+
+  void TrajectoryRenderable::EndAlpha::set(float val)
+  {
+    GetNativeComponent()->SetEndAlpha(val);
+  }
+
+  float TrajectoryRenderable::EndAlpha::get()
+  {
+    return GetNativeComponent()->GetEndAlpha();
+  }
+
+  void TrajectoryRenderable::ColorEvolveRate::set(float val)
+  {
+    GetNativeComponent()->SetColorEvolveRate(val);
+  }
+
+  float TrajectoryRenderable::ColorEvolveRate::get()
+  {
+    return GetNativeComponent()->GetColorEvolveRate();
+  }
+}

SHADE_Managed/src/Components/TrajectoryRenderable.hxx

@@ -0,0 +1,87 @@
+/************************************************************************************//*!
+\file           TrajectoryRenderable.hxx
+\author         Brandon Mak, brandon.hao,
+\par            email: brandon.hao\@digipen.edu
+\date           1st March, 2023
+\brief          Contains the definition of the managed Renderable class with the
+                declaration of functions for working with it.
+
+                Note: This file is written in C++17/CLI.
+
+Copyright (C) 2022 DigiPen Institute of Technology.
+Reproduction or disclosure of this file or its contents without the prior written consent
+of DigiPen Institute of Technology is prohibited.
+*//*************************************************************************************/
+#pragma once
+
+// Project Includes
+#include "Components/Component.hxx"
+#include "Math/Quaternion.hxx"
+// External Dependencies
+#include "Graphics/MiddleEnd/TrajectoryRendering/SHTrajectoryRenderableComponent.h"
+#include "Graphics/Color.hxx"
+#include "Assets/MeshAsset.hxx"
+
+namespace SHADE
+{
+  /// <summary>
+  /// CLR version of the SHADE Engine's SHRenderableComponent.
+  /// </summary>
+  public ref class TrajectoryRenderable : public Component<SHTrajectoryRenderableComponent>
+  {
+  internal:
+    /*-----------------------------------------------------------------------------*/
+    /* Constructors                                                                */
+    /*-----------------------------------------------------------------------------*/
+    /// <summary>
+    /// Constructs a Trajectory Renderable Component that represents a native Trajectory Renderable 
+    /// component tied to the specified Entity.
+    /// </summary>
+    /// <param name="entity">Entity that this Component will be tied to.</param>
+    TrajectoryRenderable(Entity entity);
+
+  public:
+    /*-----------------------------------------------------------------------------*/
+    /* Properties                                                                  */
+    /*-----------------------------------------------------------------------------*/
+    /// <summary>
+    /// Mesh used to render this Renderable.
+    /// </summary>
+    property MeshAsset Mesh
+    {
+      MeshAsset get();
+      void set(MeshAsset value);
+    }
+
+    property Vector3 StartColor
+    {
+      Vector3 get();
+      void set (Vector3 val);
+    }
+
+    property Vector3 EndColor
+    {
+      Vector3 get();
+      void set(Vector3 val);
+    }
+
+    property float StartAlpha
+    {
+      float get();
+      void set (float val);
+    }
+
+    property float EndAlpha
+    {
+      float get();
+      void set(float val);
+    }
+
+    property float ColorEvolveRate
+    {
+      float get();
+      void set(float val);
+    }
+  };
+}
+

SHADE_Managed/src/Engine/ECS.cxx

@@ -46,6 +46,8 @@ of DigiPen Institute of Technology is prohibited.
 #include "Components\UIElement.hxx"
 #include "Components\Canvas.hxx"
 #include "Components\Slider.hxx"
+#include "Components\TrajectoryRenderable.hxx"
+#include "Graphics\MiddleEnd\TrajectoryRendering\SHTrajectoryRenderableComponent.h"
 
 
 
@@ -335,6 +337,7 @@ namespace SHADE
         componentMap.Add(createComponentSet<SHUIComponent, UIElement>());
         componentMap.Add(createComponentSet<SHCanvasComponent, Canvas>());
         componentMap.Add(createComponentSet<SHSliderComponent, Slider>());
+        componentMap.Add(createComponentSet<SHTrajectoryRenderableComponent, TrajectoryRenderable>());
     }
     
     /*---------------------------------------------------------------------------------*/