Added BufferMapper class

Used to map/unmap a buffer automatically and provide a RAII
exception-safe class


Former-commit-id: 2a4fd2e19ce3531639a86520876a3615846b27f4

include/Nazara/Utility/BufferMapper.inl

@@ -0,0 +1,67 @@
+// Copyright (C) 2012 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+// http://www.easyrgb.com/index.php?X=MATH
+
+#include <Nazara/Utility/BufferMapper.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Core/Debug.hpp>
+
+template<typename T>
+NzBufferMapper<T>::NzBufferMapper(T* buffer, nzBufferAccess access, unsigned int offset, unsigned int length) :
+m_buffer(buffer)
+{
+	m_ptr = buffer->Map(access, offset, length);
+	if (!m_ptr)
+		NazaraError("Failed to map buffer"); ///TODO: Unexpected
+}
+
+template<typename T>
+NzBufferMapper<T>::NzBufferMapper(T& buffer, nzBufferAccess access, unsigned int offset, unsigned int length) :
+NzBufferMapper(&buffer, access, offset, length)
+{
+}
+
+template<typename T>
+NzBufferMapper<T>::NzBufferMapper(const T* buffer, nzBufferAccess access, unsigned int offset, unsigned int length) :
+m_buffer(buffer)
+{
+	m_ptr = buffer->Map(access, offset, length);
+	if (!m_ptr)
+		NazaraError("Failed to map buffer"); ///TODO: Unexpected
+}
+
+template<typename T>
+NzBufferMapper<T>::NzBufferMapper(const T& buffer, nzBufferAccess access, unsigned int offset, unsigned int length) :
+NzBufferMapper(&buffer, access, offset, length)
+{
+}
+
+template<typename T>
+NzBufferMapper<T>::~NzBufferMapper()
+{
+	if (m_buffer)
+		m_buffer->Unmap();
+}
+
+template<typename T>
+const T* NzBufferMapper<T>::GetBuffer() const
+{
+	return m_buffer;
+}
+
+template<typename T>
+void* NzBufferMapper<T>::GetPointer() const
+{
+	return m_ptr;
+}
+
+template<typename T>
+void NzBufferMapper<T>::Unmap()
+{
+	m_buffer->Unmap();
+	m_buffer = nullptr;
+}
+
+#include <Nazara/Core/DebugOff.hpp>