Graphics: Add RenderElement and ElementRenderer (WIP)

src/Nazara/Graphics/SubmeshRenderer.cpp

@@ -0,0 +1,57 @@
+// Copyright (C) 2017 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Graphics module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Graphics/SubmeshRenderer.hpp>
+#include <Nazara/Graphics/Graphics.hpp>
+#include <Nazara/Graphics/RenderSubmesh.hpp>
+#include <Nazara/Renderer/CommandBufferBuilder.hpp>
+#include <Nazara/Graphics/Debug.hpp>
+
+namespace Nz
+{
+	void SubmeshRenderer::Render(CommandBufferBuilder& commandBuffer, const RenderElement** elements, std::size_t elementCount)
+	{
+		const AbstractBuffer* currentIndexBuffer = nullptr;
+		const AbstractBuffer* currentVertexBuffer = nullptr;
+		const RenderPipeline* currentPipeline = nullptr;
+		const ShaderBinding* currentMaterialBinding = nullptr;
+
+		for (std::size_t i = 0; i < elementCount; ++i)
+		{
+			assert(elements[i]->GetElementType() == UnderlyingCast(BasicRenderElement::Submesh));
+			const RenderSubmesh& submesh = static_cast<const RenderSubmesh&>(*elements[i]);
+
+			if (const RenderPipeline* pipeline = submesh.GetRenderPipeline(); currentPipeline != pipeline)
+			{
+				commandBuffer.BindPipeline(*pipeline);
+				currentPipeline = pipeline;
+			}
+
+			if (const ShaderBinding* materialBinding = &submesh.GetMaterialBinding(); currentMaterialBinding != materialBinding)
+			{
+				commandBuffer.BindShaderBinding(Graphics::MaterialBindingSet, *materialBinding);
+				currentMaterialBinding = materialBinding;
+			}
+
+			if (const AbstractBuffer* indexBuffer = submesh.GetIndexBuffer(); currentIndexBuffer != indexBuffer)
+			{
+				commandBuffer.BindIndexBuffer(*indexBuffer);
+				currentIndexBuffer = indexBuffer;
+			}
+
+			if (const AbstractBuffer* vertexBuffer = submesh.GetVertexBuffer(); currentVertexBuffer != vertexBuffer)
+			{
+				commandBuffer.BindVertexBuffer(0, *vertexBuffer);
+				currentVertexBuffer = vertexBuffer;
+			}
+
+			commandBuffer.BindShaderBinding(Graphics::WorldBindingSet, submesh.GetInstanceBinding());
+
+			if (currentIndexBuffer)
+				commandBuffer.DrawIndexed(submesh.GetIndexCount());
+			else
+				commandBuffer.Draw(submesh.GetIndexCount());
+		}
+	}
+}