Shader/SpirvWriter: Split section to another class + improve variadic parameters support

src/Nazara/Shader/SpirvSection.cpp

@@ -0,0 +1,38 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Shader generator"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Shader/SpirvSection.hpp>
+#include <Nazara/Core/Endianness.hpp>
+#include <Nazara/Shader/Debug.hpp>
+
+namespace Nz
+{
+	std::size_t SpirvSection::Append(const Raw& raw)
+	{
+		std::size_t offset = GetOutputOffset();
+
+		const UInt8* ptr = static_cast<const UInt8*>(raw.ptr);
+
+		std::size_t size4 = CountWord(raw);
+		for (std::size_t i = 0; i < size4; ++i)
+		{
+			UInt32 codepoint = 0;
+			for (std::size_t j = 0; j < 4; ++j)
+			{
+#ifdef NAZARA_BIG_ENDIAN
+				std::size_t pos = i * 4 + (3 - j);
+#else
+				std::size_t pos = i * 4 + j;
+#endif
+
+				if (pos < raw.size)
+					codepoint |= UInt32(ptr[pos]) << (j * 8);
+			}
+
+			Append(codepoint);
+		}
+
+		return offset;
+	}
+}