SHADE_Engine/src/Graphics/Descriptors/SHVkDescriptorSetGroup.cpp

@@ -177,6 +177,21 @@ namespace SHADE
     }
   }
 
+  void SHVkDescriptorSetGroup::ModifyWriteDescImage(uint32_t set, uint32_t binding, std::tuple<Handle<SHVkImageView>, Handle<SHVkSampler>, vk::ImageLayout> const& imageViewAndSampler, uint32_t descIndex) noexcept
+  {
+    // Find the target writeDescSet
+    BindingAndSetHash writeHash = binding;
+    writeHash |= static_cast<uint64_t>(set) << 32;
+    auto& writeInfo = updater.writeInfos[updater.writeHashMap.at(writeHash)];
+
+    // write sampler and image view
+    auto& [view, sampler, layout] = imageViewAndSampler;
+    writeInfo.descImageInfos[descIndex].imageView = view->GetImageView();
+    writeInfo.descImageInfos[descIndex].sampler = sampler ? sampler->GetVkSampler() : nullptr;
+    writeInfo.descImageInfos[descIndex].imageLayout = layout;
+
+  }
+
   void SHVkDescriptorSetGroup::ModifyWriteDescBuffer(uint32_t set, uint32_t binding, std::span<Handle<SHVkBuffer>> const& buffers, uint32_t offset, uint32_t range) noexcept
   {
     // Find the target writeDescSet

SHADE_Engine/src/Graphics/Descriptors/SHVkDescriptorSetGroup.h

@@ -67,6 +67,7 @@ namespace SHADE
     void UpdateDescriptorSetBuffer(uint32_t set, uint32_t binding) noexcept;
 
     void ModifyWriteDescImage(uint32_t set, uint32_t binding, std::span<std::tuple<Handle<SHVkImageView>, Handle<SHVkSampler>, vk::ImageLayout>> const& imageViewsAndSamplers) noexcept;
+    void ModifyWriteDescImage(uint32_t set, uint32_t binding, std::tuple<Handle<SHVkImageView>, Handle<SHVkSampler>, vk::ImageLayout> const& imageViewAndSampler, uint32_t descIndex) noexcept;
     void ModifyWriteDescBuffer (uint32_t set, uint32_t binding, std::span<Handle<SHVkBuffer>> const& buffers, uint32_t offset, uint32_t range) noexcept;
 
 

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

@@ -150,12 +150,26 @@ namespace SHADE
     Handle<SHVkDescriptorSetLayout> fontDataDescSetLayout = logicalDevice->CreateDescriptorSetLayout({ fontBitmapBinding, fontMatrixBinding });
     SET_VK_OBJ_NAME(logicalDevice, vk::ObjectType::eDescriptorSetLayout, fontDataDescSetLayout->GetVkHandle(), "[Descriptor Set Layout] Font Data");
 
+    // descriptor binding for storing shadow maps
+    SHVkDescriptorSetLayout::Binding shadowMapBinding
+    {
+      .Type = vk::DescriptorType::eCombinedImageSampler,
+      .Stage = vk::ShaderStageFlagBits::eVertex | vk::ShaderStageFlagBits::eFragment | vk::ShaderStageFlagBits::eCompute,
+      .BindPoint = SHGraphicsConstants::DescriptorSetBindings::IMAGE_AND_SAMPLERS_DATA,
+      .DescriptorCount = 200, // we can have up to 2000 textures for now
+      .flags = vk::DescriptorBindingFlagBits::eVariableDescriptorCount,
+    };
+
+    // For global data (generic data and textures)
+    Handle<SHVkDescriptorSetLayout> shadowMapDescLayout = logicalDevice->CreateDescriptorSetLayout({ shadowMapBinding });
+    SET_VK_OBJ_NAME(logicalDevice, vk::ObjectType::eDescriptorSetLayout, shadowMapDescLayout->GetVkHandle(), "[Descriptor Set Layout] Shadow Maps");
 
     predefinedLayouts.push_back(staticGlobalLayout);
     predefinedLayouts.push_back(lightDataDescSetLayout);
     predefinedLayouts.push_back(cameraDataGlobalLayout);
     predefinedLayouts.push_back(materialDataPerInstanceLayout);
     predefinedLayouts.push_back(fontDataDescSetLayout);
+    predefinedLayouts.push_back(shadowMapDescLayout);
 
     perSystemData[SHUtilities::ConvertEnum(SystemType::BATCHING)].descSetLayouts = GetPredefinedDescSetLayouts
     (

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

@@ -28,6 +28,7 @@ namespace SHADE
       CAMERA = 0x04,
       MATERIALS = 0x08,
       FONT = 0x10,
+      SHADOW = 0x20,
     };
 
     enum class SystemType

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

@@ -169,6 +169,15 @@ namespace SHADE
       /***************************************************************************/
       static constexpr uint32_t FONT_MATRIX_DATA = 1;
 
+      /***************************************************************************/
+      /*!
+        \brief
+          Descriptor set binding for shadow map images.
+
+      */
+      /***************************************************************************/
+      static constexpr uint32_t SHADOW_MAP_IMAGE_SAMPLER_DATA = 0;
+
     };
 
     struct VertexBufferBindings

SHADE_Engine/src/Graphics/MiddleEnd/Interface/SHGraphicsSystem.cpp

@@ -394,7 +394,11 @@ namespace SHADE
     postOffscreenRenderSubSystem->Init(device, renderGraph->GetRenderGraphResource("Scene"), descPool);
 
     lightingSubSystem = resourceManager.Create<SHLightingSubSystem>();
-    lightingSubSystem->Init(device, descPool);
+    lightingSubSystem->Init(device, descPool, samplerCache.GetSampler (device, SHVkSamplerParams
+        {
+          // nothing for now
+        })
+      );
 
     textRenderingSubSystem = resourceManager.Create<SHTextRenderingSubSystem>();
 

SHADE_Engine/src/Graphics/MiddleEnd/Lights/SHLightingSubSystem.cpp

@@ -10,6 +10,9 @@
 #include "SHLightComponent.h"
 #include "Math/Vector/SHVec4.h"
 #include "Math/SHMatrix.h"
+#include "Graphics/Images/SHVkImageView.h"
+#include "Graphics/MiddleEnd/Textures/SHVkSamplerCache.h"
+#include "Graphics/Images/SHVkSampler.h"
 
 namespace SHADE
 {
@@ -365,6 +368,11 @@ namespace SHADE
     }
   }
 
+  void SHLightingSubSystem::UpdateShadowMapDesc(void) noexcept
+  {
+
+  }
+
   /***************************************************************************/
   /*!
   
@@ -375,13 +383,14 @@ namespace SHADE
   
   */
   /***************************************************************************/
-  void SHLightingSubSystem::Init(Handle<SHVkLogicalDevice> device, Handle<SHVkDescriptorPool> descPool) noexcept
+  void SHLightingSubSystem::Init(Handle<SHVkLogicalDevice> device, Handle<SHVkDescriptorPool> descPool, Handle<SHVkSampler> inShadowMapSampler) noexcept
   {
     SHComponentManager::CreateComponentSparseSet<SHLightComponent>();
 
     logicalDevice = device;
     uint32_t constexpr NUM_LIGHT_TYPES = SHUtilities::ConvertEnum(SH_LIGHT_TYPE::NUM_TYPES);
 
+#pragma region LIGHTING
     std::vector<uint32_t> variableSizes{ NUM_LIGHT_TYPES };
     std::fill (variableSizes.begin(), variableSizes.end(), 1);
 
@@ -418,7 +427,21 @@ namespace SHADE
     	dynamicOffsets[i].resize(NUM_LIGHT_TYPES + 1); // +1 for the count
     }
 
+#pragma endregion
+
+#pragma region SHADOWS
+    std::vector<uint32_t> shadowDescVariableSizes{ MAX_SHADOWS };
+    shadowMapDescriptorSet = descPool->Allocate({SHGraphicsPredefinedData::GetPredefinedDescSetLayouts(SHGraphicsPredefinedData::PredefinedDescSetLayoutTypes::SHADOW)}, shadowDescVariableSizes);
+
+#ifdef _DEBUG
+    const auto& SHADOW_MAP_DESC_SETS = shadowMapDescriptorSet->GetVkHandle();
+    for (int i = 0; i < static_cast<int>(SHADOW_MAP_DESC_SETS.size()); ++i)
+      SET_VK_OBJ_NAME(logicalDevice, vk::ObjectType::eDescriptorSet, SHADOW_MAP_DESC_SETS[i], "[Descriptor Set] Shadow Map Data Frame #" + std::to_string(i));
+#endif
+
+    shadowMapSampler = inShadowMapSampler;
     //numLightComponents = 0;
+#pragma endregion 
   }
 
   /***************************************************************************/
@@ -526,6 +549,36 @@ namespace SHADE
 
   }
 
+  void SHLightingSubSystem::AddShadowMap(Handle<SHRenderGraphResource> newShadowMap) noexcept
+  {
+    // Add to container of shadow maps
+    shadowMaps.emplace_back(newShadowMap);
+
+    // Just use the image view stored in the resource
+    Handle<SHVkImageView> const NEW_IMAGE_VIEW = newShadowMap->GetImageView();
+
+    // Prepare to write to descriptor
+    shadowMapImageSamplers.emplace_back(NEW_IMAGE_VIEW, shadowMapSampler, vk::ImageLayout::eShaderReadOnlyOptimal);
+
+    static constexpr uint32_t SHADOW_MAP_DESC_SET_INDEX = 0;
+    uint32_t const SHADOW_MAP_DESC_ARRAY_INDEX = shadowMapImageSamplers.size() - 1;
+    shadowMapDescriptorSet->ModifyWriteDescImage
+    (
+      SHADOW_MAP_DESC_SET_INDEX,
+      SHGraphicsConstants::DescriptorSetBindings::SHADOW_MAP_IMAGE_SAMPLER_DATA,
+      shadowMapImageSamplers[SHADOW_MAP_DESC_ARRAY_INDEX],
+      SHADOW_MAP_DESC_ARRAY_INDEX
+    );
+
+    // TODO: Definitely can be optimized by writing a function that modifies a specific descriptor in the array
+    shadowMapDescriptorSet->UpdateDescriptorSetImages
+    (
+      SHADOW_MAP_DESC_SET_INDEX,
+      SHGraphicsConstants::DescriptorSetBindings::SHADOW_MAP_IMAGE_SAMPLER_DATA
+    );
+
+  }
+
   Handle<SHVkDescriptorSetGroup> SHLightingSubSystem::GetLightDataDescriptorSet(void) const noexcept
   {
     return lightingDataDescSet;

SHADE_Engine/src/Graphics/MiddleEnd/Lights/SHLightingSubSystem.h

@@ -6,6 +6,7 @@
 #include "SHLightData.h"
 #include <array>
 #include "Graphics/MiddleEnd/Interface/SHGraphicsConstants.h"
+#include "Graphics/RenderGraph/SHRenderGraphResource.h"
 
 namespace SHADE
 {
@@ -16,6 +17,9 @@ namespace SHADE
   class SHVkBuffer;
   class SHLightComponent;
   class SHVkCommandBuffer;
+  class SHSamplerCache;
+  class SHVkImageView;
+  class SHVkSampler;
 
   // Represents how the data will be interpreted in GPU. we want to copy to a container of these before passing to GPU.
   struct SHDirectionalLightData 
@@ -123,6 +127,11 @@ namespace SHADE
     };
 
   private:
+    /*-----------------------------------------------------------------------*/
+    /* STATIC MEMBER VARIABLES                                               */
+    /*-----------------------------------------------------------------------*/
+
+    static constexpr uint32_t                                                            MAX_SHADOWS = 200;
 
     //! logical device used for creation
     Handle<SHVkLogicalDevice>                                                            logicalDevice;
@@ -150,23 +159,46 @@ namespace SHADE
     //! don't do anything.
     //uint32_t                                                                  numLightComponents;
 
+    //! Handle to sampler that all shadow map descriptors will use
+    Handle<SHVkSampler>                                                                  shadowMapSampler;
+
+    //! Shadow maps for every light that casts a shadow
+    std::vector<Handle<SHRenderGraphResource>>                                           shadowMaps;
+
+    //! Descriptor sets required to be given to the compute shader for shadow calculation. This will be a descriptor array.
+    //! It will also be preallocated. 
+    Handle<SHVkDescriptorSetGroup>                                                       shadowMapDescriptorSet;
+
+    //! Combined image samplers for the texture descriptors
+    std::vector<std::tuple<Handle<SHVkImageView>, Handle<SHVkSampler>, vk::ImageLayout>> shadowMapImageSamplers;
+
+    //! Barriers required to transition the resources from whatever layout they are in (probably from VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL)
+    //! to VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL) 
+    std::vector<vk::ImageMemoryBarrier>                                                  shadowMapMemoryBarriers;
+
     /*-----------------------------------------------------------------------*/
     /* PRIVATE MEMBER FUNCTIONS                                              */
     /*-----------------------------------------------------------------------*/
     void UpdateDescSet         (uint32_t binding) noexcept;
     void ComputeDynamicOffsets (void) noexcept;
     void ResetNumLights        (void) noexcept;
+    void UpdateShadowMapDesc   (void) noexcept;
 
   public:
 
     /*-----------------------------------------------------------------------*/
     /* PUBLIC MEMBER FUNCTIONS                                               */
     /*-----------------------------------------------------------------------*/
-    void Init (Handle<SHVkLogicalDevice> device, Handle<SHVkDescriptorPool> descPool) noexcept;
+    void Init            (Handle<SHVkLogicalDevice> device, Handle<SHVkDescriptorPool> descPool, Handle<SHVkSampler> inShadowMapSampler) noexcept;
     void Run             (SHMatrix const& viewMat, uint32_t frameIndex) noexcept;
     void Exit            (void) noexcept;
-
     void BindDescSet     (Handle<SHVkCommandBuffer> cmdBuffer, uint32_t setIndex, uint32_t frameIndex) noexcept;
+    void AddShadowMap    (Handle<SHRenderGraphResource> newShadowMap) noexcept;
+    //void RemoveShadowMap (uint32_t index) noexcept;
+
+    /*-----------------------------------------------------------------------*/
+    /* SETTERS AND GETTERS                                                   */
+    /*-----------------------------------------------------------------------*/
     Handle<SHVkDescriptorSetGroup> GetLightDataDescriptorSet (void) const noexcept;
 
   };