ShaderLang: Add support for length intrinsic

include/Nazara/Shader/Ast/Enums.hpp

@@ -54,9 +54,10 @@ namespace Nz::ShaderAst
 
 	enum class IntrinsicType
 	{
-		CrossProduct,
-		DotProduct,
-		SampleTexture
+		CrossProduct = 0,
+		DotProduct = 1,
+		Length = 3,
+		SampleTexture = 2,
 	};
 
 	enum class MemoryLayout

include/Nazara/Shader/SpirvWriter.hpp

@@ -57,6 +57,7 @@ namespace Nz
 			SpirvConstantCache::TypePtr BuildFunctionType(const ShaderAst::DeclareFunctionStatement& functionNode);
 
 			UInt32 GetConstantId(const ShaderAst::ConstantValue& value) const;
+			UInt32 GetExtendedInstructionSet(const std::string& instructionSetName) const;
 			UInt32 GetExtVarPointerId(std::size_t varIndex) const;
 			UInt32 GetFunctionTypeId(const ShaderAst::DeclareFunctionStatement& functionNode);
 			UInt32 GetPointerTypeId(const ShaderAst::ExpressionType& type, SpirvStorageClass storageClass) const;