Graphics: Add billboard class

Former-commit-id: bc898f00aa78dd42f61d34ce743ed9a73dce55f6

src/Nazara/Graphics/Billboard.cpp

@@ -0,0 +1,28 @@
+// Copyright (C) 2015 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/Billboard.hpp>
+#include <Nazara/Graphics/AbstractRenderQueue.hpp>
+#include <Nazara/Graphics/AbstractViewer.hpp>
+#include <Nazara/Math/Algorithm.hpp>
+#include <cstring>
+#include <memory>
+#include <Nazara/Graphics/Debug.hpp>
+
+void NzBillboard::AddToRenderQueue(NzAbstractRenderQueue* renderQueue, const InstanceData& instanceData) const
+{
+	if (!m_material)
+		return;
+
+	renderQueue->AddBillboard(m_material, instanceData.transformMatrix.GetTranslation(), m_size, m_sinCos, m_color);
+}
+
+void NzBillboard::MakeBoundingVolume() const
+{
+	constexpr float sqrt2 = float(M_SQRT2);
+
+	m_boundingVolume.Set(NzVector3f(0.f), sqrt2*m_size.x*NzVector3f::Right() + sqrt2*m_size.y*NzVector3f::Down());
+}
+
+NzBillboardLibrary::LibraryMap NzBillboard::s_library;