What is the meaning of these identifiers "@" in the shader?

General
#1

Hi, guys, I am a newbie. Does anyone know what these identifiers “@” mean? For example,

// Get material properties function (for pixel shader)

Material GetMaterialPS(MaterialInput input)

{

“@4”

}

Thanks a lot!

#2

@3

#include “./Flax/Common.hlsl”

#include “./Flax/MaterialCommon.hlsl”

#include “./Flax/GBufferCommon.hlsl”

@7

This symbol confuses me so much!

#3

Those are special locations for Material generator tool to inject code0generated source of the shader from the Material Graph. FlaxEngine/Source/Engine/Tools/MaterialGenerator/MaterialGenerator.cpp at master · FlaxEngine/FlaxEngine · GitHub

#4

Thank you! but I still have a question, when is MaterialGenerator::Generate() called? If you want to inject shader code, it should be before ShadersCompilation::Compile()—>Device create the real shader module, otherwise the shader will not compile.

#5

Material shaders are generated during Material::load and compiled via ShaderAssetBase::LoadShaderCache. Additionally, shaders compilation can happen during game cooking (ProcessShaderBase in CookAssetsStep.cpp).

#6

Thank you so much! I’ll try to track and debug it tomorrow.