Remade instancing

Former-commit-id: b297ed84e86a714c58d42219cc1dd8337e3a732c

src/Nazara/Graphics/AbstractRenderTechnique.cpp

@@ -3,6 +3,34 @@
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
 #include <Nazara/Graphics/AbstractRenderTechnique.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Renderer/Renderer.hpp>
 #include <Nazara/Graphics/Debug.hpp>
 
+NzAbstractRenderTechnique::NzAbstractRenderTechnique()
+{
+	#ifdef NAZARA_DEBUG
+	if (!NzRenderer::IsInitialized())
+	{
+		NazaraError("NazaraRenderer is not initialized");
+		return;
+	}
+	#endif
+
+	m_instancingEnabled = NzRenderer::HasCapability(nzRendererCap_Instancing);
+}
+
 NzAbstractRenderTechnique::~NzAbstractRenderTechnique() = default;
+
+void NzAbstractRenderTechnique::EnableInstancing(bool instancing)
+{
+	if (NzRenderer::HasCapability(nzRendererCap_Instancing))
+		m_instancingEnabled = instancing;
+	else if (instancing)
+		NazaraError("NazaraRenderer does not support instancing");
+}
+
+bool NzAbstractRenderTechnique::IsInstancingEnabled() const
+{
+	return m_instancingEnabled;
+}