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

include/Nazara/Shader/SpirvSection.hpp

@@ -0,0 +1,73 @@
+// 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
+
+#pragma once
+
+#ifndef NAZARA_SPIRVSECTION_HPP
+#define NAZARA_SPIRVSECTION_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Shader/ShaderEnums.hpp>
+#include <Nazara/Shader/SpirvData.hpp>
+#include <string>
+#include <vector>
+
+namespace Nz
+{
+	class NAZARA_SHADER_API SpirvSection
+	{
+		public:
+			struct OpSize;
+			struct Raw;
+
+			SpirvSection() = default;
+			SpirvSection(const SpirvSection& cache) = default;
+			SpirvSection(SpirvSection&& cache) = default;
+			~SpirvSection() = default;
+
+			inline std::size_t Append(const char* str);
+			inline std::size_t Append(const std::string_view& str);
+			inline std::size_t Append(const std::string& str);
+			inline std::size_t Append(UInt32 value);
+			inline std::size_t Append(SpirvOp opcode, const OpSize& wordCount);
+			std::size_t Append(const Raw& raw);
+			inline std::size_t Append(std::initializer_list<UInt32> codepoints);
+			template<typename... Args> std::size_t Append(SpirvOp opcode, const Args&... args);
+			template<typename F> std::size_t AppendVariadic(SpirvOp opcode, F&& callback);
+			template<typename T> std::size_t Append(T value);
+
+			inline unsigned int CountWord(const char* str);
+			inline unsigned int CountWord(const std::string_view& str);
+			inline unsigned int CountWord(const std::string& str);
+			inline unsigned int CountWord(const Raw& raw);
+			template<typename T> unsigned int CountWord(const T& value);
+			template<typename T1, typename T2, typename... Args> unsigned int CountWord(const T1& value, const T2& value2, const Args&... rest);
+
+			inline const std::vector<UInt32>& GetBytecode() const;
+			inline std::size_t GetOutputOffset() const;
+
+			SpirvSection& operator=(const SpirvSection& cache) = delete;
+			SpirvSection& operator=(SpirvSection&& cache) = default;
+
+			struct OpSize
+			{
+				unsigned int wc;
+			};
+
+			struct Raw
+			{
+				const void* ptr;
+				std::size_t size;
+			};
+
+			static inline UInt32 BuildOpcode(SpirvOp opcode, unsigned int wordCount);
+
+		private:
+			std::vector<UInt32> m_bytecode;
+	};
+}
+
+#include <Nazara/Shader/SpirvSection.inl>
+
+#endif