Adding basic depth prepass

src/Engine/Graphics/RenderPass/RenderGraph.cpp

@@ -0,0 +1,39 @@
+#include "RenderGraph.h"
+
+using namespace Seele;
+
+
+RenderGraph::RenderGraph() 
+{
+}
+
+RenderGraph::~RenderGraph() 
+{   
+}
+
+void RenderGraph::setup() 
+{
+    for(auto pass : renderPasses)
+    {
+        pass->publishOutputs();
+    }
+    for(auto pass : renderPasses)
+    {
+        pass->createRenderPass();
+    }
+}
+
+Gfx::PRenderTargetAttachment RenderGraph::requestRenderTarget(const std::string& outputName) 
+{
+    if(registeredAttachments.find(outputName) == registeredAttachments.end())
+    {
+        std::cout << "Attachment " << outputName << " not found" << std::endl; 
+        return nullptr;
+    }
+    return registeredAttachments[outputName];
+}
+
+void RenderGraph::registerRenderPassOutput(const std::string& outputName, Gfx::PRenderTargetAttachment attachment) 
+{
+    registeredAttachments[outputName] = attachment;
+}