Added functionality for graphics system to render to swapchain image

- Added functionality for graphics system to render to swapchain image when SHEDITOR is disabled. This is done via rendering a simple quad on screen and using an input attachment as a texture to the shader.

Assets/Shaders/ToSwapchain_VS.glsl

@@ -10,6 +10,6 @@ vec2 CreateQuad(in uint vertexID)
 
 void main()
 {
-  vec2 vertexPos = CreateQuad(gl_VertexIndex) - vec2(0.5f);
+  vec2 vertexPos = 2 * (CreateQuad(gl_VertexIndex) - vec2(0.5f));
   gl_Position = vec4 (vertexPos, 0.0f, 1.0f);
 }

SHADE_Application/src/Application/SBApplication.cpp

@@ -80,8 +80,8 @@ namespace Sandbox
     SHSystemManager::CreateSystem<SHCameraSystem>();
     SHSystemManager::CreateSystem<SHUISystem>();
 
-    std::system("FontCompiler.exe ../../Assets/Fonts/SegoeUI.ttf");
-    std::system("FontCompiler.exe ../../Assets/Fonts/ALGER.ttf");
+    //std::system("FontCompiler.exe ../../Assets/Fonts/SegoeUI.ttf");
+    //std::system("FontCompiler.exe ../../Assets/Fonts/ALGER.ttf");
 
     SHSystemManager::CreateSystem<SHGraphicsSystem>();
     SHGraphicsSystem* graphicsSystem = static_cast<SHGraphicsSystem*>(SHSystemManager::GetSystem<SHGraphicsSystem>());

SHADE_Engine/src/Graphics/RenderGraph/SHRenderGraph.cpp

@@ -565,8 +565,10 @@ namespace SHADE
         {
           cmdBuffer->BindPipeline(renderToSwapchainImageSystem->GetPipeline());
           
+          newSubpass->BindDescriptorInputDescriptorSets (cmdBuffer, frameIndex);
+
           // draw a quad.
-          cmdBuffer->DrawIndexed(4, 0, 0);
+          cmdBuffer->DrawArrays(4, 1, 0, 0);
         });
     }
   }

SHADE_Engine/src/Graphics/RenderGraph/SHSubpass.cpp

@@ -40,7 +40,7 @@ namespace SHADE
     , inputReferences{}
     , name { name }
     , graphStorage{ renderGraphStorage }
-    , inputImageDescriptors {SHGraphicsConstants::NUM_FRAME_BUFFERS}
+    , inputImageDescriptorSets{}
   {
   }
 
@@ -67,7 +67,7 @@ namespace SHADE
     , exteriorDrawCalls{ std::move(rhs.exteriorDrawCalls) }
     , graphStorage{ rhs.graphStorage }
     , inputNames{ std::move(rhs.inputNames) }
-    , inputImageDescriptors{ std::move(rhs.inputImageDescriptors) }
+    , inputImageDescriptorSets{ std::move(rhs.inputImageDescriptorSets) }
     , inputDescriptorLayout{ rhs.inputDescriptorLayout }
     , inputSamplers{ rhs.inputSamplers }
     , name { rhs.name }
@@ -102,7 +102,7 @@ namespace SHADE
     exteriorDrawCalls = std::move(rhs.exteriorDrawCalls);
     graphStorage = rhs.graphStorage;
     inputNames = std::move(rhs.inputNames);
-    inputImageDescriptors = std::move(rhs.inputImageDescriptors);
+    inputImageDescriptorSets = std::move(rhs.inputImageDescriptorSets);
     inputDescriptorLayout = rhs.inputDescriptorLayout;
     inputSamplers = rhs.inputSamplers;
     name = std::move(rhs.name);
@@ -202,6 +202,8 @@ namespace SHADE
   void SHSubpass::Execute(Handle<SHVkCommandBuffer>& commandBuffer, Handle<SHVkDescriptorPool> descPool, uint32_t frameIndex) noexcept
   {
     commandBuffer->BeginLabeledSegment(name);
+   
+
     // Ensure correct transforms are provided
     superBatch->UpdateBuffers(frameIndex, descPool);
 
@@ -221,6 +223,14 @@ namespace SHADE
     UpdateWriteDescriptors();
   }
 
+  void SHSubpass::BindDescriptorInputDescriptorSets(Handle<SHVkCommandBuffer> cmdBuffer, uint32_t frameIndex) const noexcept
+  {
+    if (!inputImageDescriptorSets.empty())
+    {
+      cmdBuffer->BindDescriptorSet(inputImageDescriptorSets[frameIndex], SH_PIPELINE_TYPE::GRAPHICS, SHGraphicsConstants::DescriptorSetIndex::RENDERGRAPH_RESOURCE, { });
+    }
+  }
+
   void SHSubpass::AddExteriorDrawCalls(std::function<void(Handle<SHVkCommandBuffer>&, uint32_t)> const& newDrawCall) noexcept
   {
     exteriorDrawCalls.push_back(newDrawCall);
@@ -237,6 +247,8 @@ namespace SHADE
     if (inputNames.empty())
       return;
 
+    inputImageDescriptorSets.resize(SHGraphicsConstants::NUM_FRAME_BUFFERS);
+
     std::vector<SHVkDescriptorSetLayout::Binding> bindings{};
 
     for (auto& input : inputReferences)
@@ -280,7 +292,7 @@ namespace SHADE
       }
     }
 
-    //// maybe do this in handle resize? 
+    // maybe do this in handle resize? 
     UpdateWriteDescriptors();
   }
 
@@ -296,7 +308,7 @@ namespace SHADE
 
 
     // For every frame's descriptor set
-    for (auto& group : inputImageDescriptors)
+    for (auto& group : inputImageDescriptorSets)
     {
       if (group)
         group.Free();

SHADE_Engine/src/Graphics/RenderGraph/SHSubpass.h

@@ -55,8 +55,11 @@ namespace SHADE
     //! For getting attachment reference indices using handles
     std::unordered_map<uint64_t, uint32_t> const* resourceAttachmentMapping;
 
-    //! Descriptor set group to hold the images for input
-    std::vector<Handle<SHVkDescriptorSetGroup>>   inputImageDescriptors;
+    //! Descriptor set group to hold the images for input. We have 3 here just in case 
+    //! one of the images is a swapchain image. Practically speaking its not likely not
+    //! swapchain images will end up being images used in descriptor sets, but this is 
+    //! to have the support for it. The cost is not much. 
+    std::vector<Handle<SHVkDescriptorSetGroup>>   inputImageDescriptorSets;
 
     //! Descriptor set layout for allocating descriptor set for inputs
     Handle<SHVkDescriptorSetLayout>               inputDescriptorLayout;
@@ -104,6 +107,7 @@ namespace SHADE
     // Runtime functions
     void Execute(Handle<SHVkCommandBuffer>& commandBuffer, Handle<SHVkDescriptorPool> descPool, uint32_t frameIndex) noexcept;
     void HandleResize (void) noexcept;
+    void BindDescriptorInputDescriptorSets (Handle<SHVkCommandBuffer> cmdBuffer, uint32_t frameIndex) const noexcept;
 
     void Init(SHResourceHub& resourceManager) noexcept;