Graphics: Add ModelInstance class

src/Nazara/Graphics/ModelInstance.cpp

@@ -0,0 +1,52 @@
+// 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/ModelInstance.hpp>
+#include <Nazara/Core/StackVector.hpp>
+#include <Nazara/Graphics/Graphics.hpp>
+#include <Nazara/Graphics/MaterialSettings.hpp>
+#include <Nazara/Graphics/PredefinedShaderStructs.hpp>
+#include <Nazara/Graphics/Debug.hpp>
+
+namespace Nz
+{
+	ModelInstance::ModelInstance(const std::shared_ptr<const MaterialSettings>& settings)
+	{
+		Nz::PredefinedInstanceData instanceUboOffsets = Nz::PredefinedInstanceData::GetOffsets();
+
+		m_instanceDataBuffer = Graphics::Instance()->GetRenderDevice().InstantiateBuffer(BufferType_Uniform);
+		if (!m_instanceDataBuffer->Initialize(instanceUboOffsets.totalSize, Nz::BufferUsage_DeviceLocal | Nz::BufferUsage_Dynamic))
+			throw std::runtime_error("failed to initialize viewer data UBO");
+
+		m_shaderBinding = settings->GetRenderPipelineLayout()->AllocateShaderBinding();
+
+		// TODO: Use StackVector
+		StackVector<ShaderBinding::Binding> bindings = NazaraStackVector(ShaderBinding::Binding, 2);
+
+		if (std::size_t bindingIndex = settings->GetPredefinedBindingIndex(PredefinedShaderBinding::UboInstanceData); bindingIndex != MaterialSettings::InvalidIndex)
+		{
+			bindings.push_back({
+				bindingIndex,
+				ShaderBinding::UniformBufferBinding {
+					m_instanceDataBuffer.get(), 0, m_instanceDataBuffer->GetSize()
+				}
+			});
+		}
+
+		if (std::size_t bindingIndex = settings->GetPredefinedBindingIndex(PredefinedShaderBinding::UboViewerData); bindingIndex != MaterialSettings::InvalidIndex)
+		{
+			const std::shared_ptr<AbstractBuffer>& instanceDataUBO = Graphics::Instance()->GetViewerDataUBO();
+
+			bindings.push_back({
+				bindingIndex,
+				ShaderBinding::UniformBufferBinding {
+					instanceDataUBO.get(), 0, instanceDataUBO->GetSize()
+				}
+			});
+		}
+
+		if (!bindings.empty())
+			m_shaderBinding->Update(bindings.data(), bindings.size());
+	}
+}